JPH06282910A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent the generation of a noise bar at the time of high speed reproduction or unwinding reproduction by controlling the position of reference edge of a magnetic tape by an inclination driving means and also changing the height of guide pole arranged on a magnetic drum. CONSTITUTION:A traveling path of the magnetic tape on an upper drum Du and a lower drum Dd is changed in such a manner that a member provided with a guide part G for the positional control of magnetic tape controlling the position of the reference edge of the magnetic tape T is inclined. This inclination is done against a center axis of rotational locus circles of rotational magnetic heads Ha, Hb by the inclination driving means including an annular cam member CA. Thus, the positions of rotational locus surfaces of the heads Ha, Hb are kept constant against a fixed part DB of the device body. Further, the height of the guide poles arranged on the drums Du, Dd is changeable in the breadthwise direction of magnetic tape by a displacement driving means. Since the reference edge Te is guided by such a constitution, the generation of noise bar is prevented even in the case the width of recording track of the magnetic tape is narrow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention responds to changes in the running speed of a magnetic tape that runs while slidingly contacting a part of the peripheral surface of a drum.
The present invention relates to a magnetic recording / reproducing apparatus belonging to a type in which a rotating magnetic head can favorably track a recording trace by changing a running position of a magnetic tape.

[0002]

2. Description of the Related Art A magnetic tape wound around a part of a peripheral surface of a drum composed of an upper drum and a lower drum is run at a predetermined running speed, and a recording / reproducing operation is performed by using a rotary magnetic head. A typical example of such a magnetic recording / reproducing apparatus is a video tape recorder (VTR). In using the VTR, in addition to the normal reproduction (normal reproduction) in which the recording information is reproduced at the same magnetic tape traveling speed as during recording, the traveling is different from the traveling speed or traveling direction of the magnetic tape during recording. Trick play in which a magnetic tape is run (including stop) at a speed or a running direction to perform a reproducing operation is also widely used.

By the way, the recording trace pattern (tape pattern or track pattern) recorded and formed on the magnetic tape in correspondence with the rotation locus of the rotary magnetic head is shown, for example, in FIG. 23 as the traveling speed of the magnetic tape is different. Will be different as you are. In FIG. 23, it corresponds to a portion where the starting point is indicated by an arrow on the lower edge Te of the magnetic tape T in the figure, and a portion of "normal + 1- + 3--" written above the upper edge side of the magnetic tape. The straight line connecting these points and a large number of straight lines parallel to the straight line were used to perform the reproducing operation by running the magnetic tape at the same running speed and running direction as the running speed and running direction of the magnetic tape during recording. When [Normal recording / playback (normal recording / playback) ... S
In the P mode, the rotation locus of the rotary magnetic head drawn on the magnetic tape T is +1 and in the EP mode is +3], and in FIG. 23, the double speed number in the SP mode is +2, +3 ... +7.
And each straight line drawn when the starting point is connected to the position of each point such as the double speed number +6, +9 ... +21 in the EP mode is the running direction of the magnetic tape T at the time of recording. In the same direction (the running direction of the magnetic tape T at the time of recording is indicated by a + sign), the running speed of the magnetic tape T at the time of recording is twice, three times, ... 6) of the running speed of the magnetic tape T during recording)
Double, 9 times ... 21 times the running speed (in EP mode),
When the magnetic tape T is run and the reproducing operation is performed (S
2 times speed, 3 times speed ... 7 times speed in P mode, 6 times speed, 9 times speed ... 21 times speed in EP mode)
The rotation locus of the rotary magnetic head drawn on the magnetic tape T is shown. Note that, in FIG. 23, the recording traces in the SP mode and the recording traces in the EP mode are illustrated as being in parallel with each other in order to avoid the complication of the drawing, but in actuality in the EP mode. The recording trace of is not parallel to the recording trace in SP mode.

Further, in the SP mode shown in FIG.
The positions of the points described as 2, -3 ...- 7, and the straight lines connecting the starting points with -6, -9 ...- 21 in the EP mode are the running directions of the magnetic tape T during recording. 2 times, 3 times ... 7 times the running speed of the magnetic tape T at the time of recording in the opposite direction (the running direction of the magnetic tape T at the time of recording is indicated by a minus sign). 6) of the running speed of the magnetic tape T during recording)
Double, 9 times ... 21 times (in EP mode) running speed,
When the reproducing operation is performed while the magnetic tape T is running, the rotation locus of the rotary magnetic head drawn on the magnetic tape T is shown. It should be noted that in FIG. 23, the straight line connecting the above-mentioned starting point and the point corresponding to the portion of “still image 0-0-.” Described above the upper edge side of the magnetic tape T in the figure is the magnetic line. The rotational locus of the rotary magnetic head drawn on the magnetic tape T when the reproducing operation is performed (still reproduction) while the tape T is stopped is shown.

When the magnetic recording / reproducing apparatus is constructed so as to be continuously reproducible in the standard mode of the VHS (registered trademark) system, the rotary magnetic head mounted on the rotary drum having a diameter of 62 mm rotates at 1800 rpm. Let
Recording performed on the magnetic tape T by the above-mentioned rotating magnetic head when the recording / reproducing operation is performed with the magnetic tape wound around a part of the outer circumference of the drum being transported at the feeding speed of 33.35 mm / sec. The trace (rotation locus of the rotary magnetic head) is 5 with respect to the reference edge Te of the magnetic head T.
It shows an angle of ° 58'9.9 "{magnetic tape T
The video track angle when the car is running is 5 ° 58 '
Then, in the VHS (registered trademark) system described above, the video track angle when the magnetic tape T is stopped and being reproduced is 5 ° 56′7.
4 ″, and for example, the position of the upper edge of the magnetic tape T indicated by the +7 display in the SP mode in FIG. 23 described above and the magnetic indication indicated by the +21 display in the EP mode. The straight line connecting the position of the upper edge of the tape T and the starting point shows an angle of 6 ° 10′54 ″ with respect to the reference edge Te of the magnetic head T. Further, for example, in the SP mode in FIG. The line connecting the starting point and the position of the upper edge of the magnetic tape T indicated by -7 and the position of the upper edge of the magnetic tape T indicated by -21 in the EP mode is the magnetic head T. The angle of 5 ° 42′25.7 ″ is shown with respect to the reference edge Te.

As will be apparent from the recording trace pattern illustrated in FIG. 23, the rotary magnetic head drawn on the magnetic tape T by the rotary magnetic head during normal recording / reproducing (normal recording / reproducing). The rotational locus of No. 1 and the rotational locus of the rotary magnetic head drawn on the magnetic tape T by the rotary magnetic head during trick play intersect. Therefore, the signal level of the frequency-modulated wave signal of the reproduction signal reproduced during trick play changes greatly every time the rotary magnetic head crosses the recording mark.
Looking at the envelope of the frequency-modulated wave signal of the reproduction signal in the vertical scanning period, a large undulation occurs in one vertical scanning period. Therefore, as a reproduced image at the time of trick play, only a reproduced image of poor quality in which a noise bar is generated in the image can be obtained. In particular, in the consumer digital VTR, since the data amount of the video signal is compressed and recorded by the high-efficiency encoding method, the rotary magnetic head is used for the magnetic tape T such as during fast-forward reproduction and rewind reproduction. When a playback operation is performed across the recording trace,
An image may not be reproduced at all depending on the arrangement state of the blocks of data arranged in a mosaic pattern.

Also, recently, by recording three recording traces having a recording trace width of 19 μm in parallel on the magnetic tape T at the same time, so-called high-definition image information can be recorded / reproduced. A form of VTR (so-called W-VHS VTR) has been proposed. In the VTR of the new type, two adjacent recording marks among three recording marks formed in parallel on the magnetic tape T at the same time are two rotating magnetic heads having azimuth angles opposite to each other. Is used for recording and reproducing video signals, and the remaining one recording mark is used for recording and reproducing acoustic signals by another rotating magnetic head, but it was recorded by such a new type VTR. When the reproducing operation from the recorded magnetic tape is the fast-forward reproducing operation or the rewinding reproducing operation, the two rotating magnetic heads for images having different azimuth angles are
Since the reproducing operation is performed across the three recording marks formed on the magnetic tape T, the reproduced image becomes full of noise bars.

In order to solve the above-mentioned problems, it suffices to make the rotational locus of the rotary magnetic head and the recording trace of the magnetic tape T coincide with each other. As an actuator in an open-loop control circuit or a closed-loop control circuit, conventionally. A rotary magnetic head is attached to the electro-mechanical conversion element to be used, and the rotary magnetic head is displaced by the electro-mechanical conversion element so that the rotary magnetic head can be traced on the recording trace of the magnetic tape T. Kosho 63-34126
As disclosed in Japanese Laid-Open Patent Publication No. 61-158633 and the like, a rotary drum on which a rotary magnetic head is attached and a lower drum are integrally tilted so that the rotary head records a recording mark on a magnetic tape T. It is possible to trace it, or, for example, as disclosed in Japanese Patent Publication No. 61-22376,
The rotary head changes the height of guides for limiting the height in the width direction of the magnetic tape provided on the entrance side of the magnetic tape with respect to the drum and the exit side of the magnetic tape from the drum, and the rotary head moves toward the magnetic tape T. Various solutions have been proposed, such as enabling traceability of recorded traces.

[0009]

However, in the VTR in which the electro-mechanical conversion element used as the actuator is used to control the rotational locus of the rotary magnetic head as described above, the rotary locus of the rotary magnetic head is controlled. Since the electro-mechanical conversion element for controlling the electro-mechanical conversion element must be provided in a narrow space inside the rotating drum, the electro-mechanical conversion element to be used needs to have a small geometrical size. It is difficult for the electro-mechanical conversion element to give a large displacement to the rotary magnetic head, and the displacement of the rotary magnetic head displaced by the electro-mechanical conversion element does not result in a poor head touch condition on the magnetic tape. However, a small actuator that exhibits good operating characteristics should be used for good recording and reproducing. It is difficult to configure a VTR that operates, and it is difficult to accurately track the rotary magnetic head with respect to a recording trace having a small recording trace width in a magnetic recording medium in which high density recording is performed. There is a problem such as.

In addition, the rotary drum and the lower drum described above are integrally tilted so that the rotary head has the magnetic tape T.
In the magnetic recording / reproducing apparatus capable of tracing the recording trace of No. 1, there is a drawback that a large driving force is required to incline a member having a large mass, and the rotating drum and the lower drum in the above are integrated. The magnetic recording / reproducing apparatus disclosed in Japanese Utility Model Publication No. 63-34126 is a magnetic recording / reproducing apparatus in which the rotary head can trace the recording trace of the magnetic tape T by inclining the magnetic tape T.
Since the guide portion of the reference edge Te of the magnetic tape T is only in contact with the reference edge Te of the magnetic tape T in a state of so-called point contact, the position of the reference edge Te of the magnetic tape T is large. In the case where the magnetic tape T is swung in the width and the magnetic tape T is recorded at a low recording density, that is, in the case of a recording trace having a large recording trace width, even if the normal reproduction can barely be performed satisfactorily, the trick. At the time of play, the magnetic tape T is in a state where the position of the reference edge Te of the magnetic tape is not correctly guided by the guide portion. The problem is that the noise bar cannot be removed well.

Furthermore, in the magnetic recording / reproducing apparatus in which the rotary drum and the lower drum are integrally tilted so that the rotary head can trace the recording traces of the magnetic tape T, the actual recording apparatus is disclosed in Japanese Utility Model Laid-Open No. 61-158633. In the magnetic recording / reproducing apparatus disclosed in the publication, a member (guide portion) that can guide a portion of a predetermined length on the reference edge of the magnetic tape that is formed separately from the lower drum is fixed to the fixed portion of the apparatus. Therefore, the change in the position of the reference edge Te of the magnetic tape T, which occurs in the magnetic recording / reproducing apparatus disclosed in Japanese Utility Model Publication No. 63-34126, can be prevented from occurring at least during the normal reproducing operation. However, when the rotating drum and the lower drum to which the magnetic head is attached are integrally tilted in order to perform the fast-forward reproduction operation or the rewind reproduction operation, the magnetic tape The magnetic tape T running in a state of sliding contact with the sliding contact surfaces of the lower and upper drums is in contact with the sliding contact surfaces of the lower and upper drums. Since it has a tendency to incline with the lower drum, the reference edge Te of the magnetic tape T is moved from a member (guide portion) for guiding the reference edge Te of the magnetic tape T with the inclination of the upper and lower drums. Displacement occurs in the away direction. Therefore, in order to perform the fast-forward reproduction operation or the rewind reproduction operation, etc., when the rotary drum having the magnetic head attached and the lower drum are integrally tilted, the above-mentioned upper and lower drums are tilted, A portion in a state where the reference edge Te of the magnetic tape T is not guided by the above-mentioned member (guide portion) for guiding the reference edge Te of the magnetic tape T occurs, and the position of the reference edge Te of the magnetic tape T in that portion. May fluctuate and generate a noise bar.

That is, when the VTR of the above-mentioned VHS (registered trademark) system is performing the recording / reproducing operation in the SP mode, and the recording trace width of the recording trace of the magnetic tape T is relatively large as 58 μm. In order to perform a fast-forward reproducing operation, a rewinding reproducing operation, or the like, when a rotating drum having a magnetic head and a lower drum are integrally tilted, a part of the reference edge Te of the magnetic tape T is magnetized. Even if a portion of the tape T that is not guided by the member (guide portion) for guiding the reference edge Te and the position of the reference edge Te of the magnetic tape T at that portion fluctuates, it may occur in the reproduced image. Although a noise bar is hardly generated, for example, the VHS (registered trademark) VTR described above is performing the recording / reproducing operation in the EP mode, and the recording trace width of the recording trace of the magnetic tape T is, for example, If small and so 9 .mu.m, in order to perform the fast-forward reproducing operation, or rewinding reproduction operation, etc., when the integrally tilted and rotating drum and the lower drum fitted with a magnetic head, the reference edge Te of the magnetic tape T
When a portion in a state not being guided by a member (guide portion) for guiding the magnetic recording medium occurs on a part of the reference edge Te of the magnetic tape T, the position of the generated magnetic field changes in the reproduced image. It was revealed to cause a noise bar. Needless to say, the above-mentioned problem similarly occurs in the VTR of the above-mentioned new form in which three recording traces having a recording trace width of 19 μm are simultaneously recorded in parallel on the magnetic tape T. Therefore, a solution to the above-mentioned problems was sought.

[0013]

SUMMARY OF THE INVENTION According to the present invention, when a rotary magnetic head is used for recording / reproducing operation on a magnetic tape wound around a part of the peripheral surface of a drum consisting of an upper drum and a lower drum. In addition, while keeping the position of the rotation locus surface of the rotary magnetic head with respect to the fixed part of the body of the magnetic recording / reproducing apparatus in a constant state, the rotation locus surface of the rotary magnetic head and the recorded trace of the magnetic tape are recorded. In the magnetic recording / reproducing apparatus including means for changing the running path of the magnetic tape on the peripheral surfaces of the upper and lower drums so as to match the above, the position of the reference edge of the magnetic tape is regulated. Inclination drive means for inclining a member having a position regulating guide portion with respect to the central axis of the rotation locus circle of the rotary magnetic head, and the circumference of the upper and lower drums in the running path of the magnetic tape. Displacement driving means for changing the heights of the guide poles arranged on the winding start side and the winding end side of the magnetic tape wound around a part of the magnetic tape in the width direction of the magnetic tape. A magnetic recording / reproducing apparatus including the above-mentioned magnetic recording / reproducing apparatus, and a member having a magnetic tape position regulating guide portion for regulating the position of the reference edge of the magnetic tape in the above-mentioned magnetic recording / reproducing apparatus, Tilting means for inclining with respect to the central axis of the magnetic tape, and winding start side of the magnetic tape wound around a part of the peripheral surface of the upper and lower drums in the traveling path of the magnetic tape on the drum peripheral surface. Displacement driving means for changing the heights of the guide poles respectively arranged on the winding end side and the winding end side in the width direction of the magnetic tape, and an inclination for inclining a member provided with the above-mentioned magnetic tape position regulating guide portion. Drive Providing stage and a magnetic recording and reproducing apparatus comprising a means for connecting coupling the displacement drive means for changing the height of the guide pole in the width direction of the magnetic tape.

[0014]

With the position of the above-mentioned rotational locus surface of the rotary magnetic head with respect to the fixed portion of the body of the magnetic recording / reproducing apparatus being kept constant, a part of the peripheral surface of the drum composed of the upper and lower drums Position control guide for the magnetic tape that controls the position of the reference edge of the magnetic tape so that the surface of the wound magnetic tape is aligned with the recorded track of the magnetic tape. A member with a section,
The tilting drive means tilts the rotary magnetic head with respect to the central axis of the rotation locus circle to change the running path of the magnetic tape on the peripheral surfaces of the upper and lower drums. Further, the magnetic tape wound around a part of the peripheral surface of the upper and lower drums in the running path of the magnetic tape is arranged on the winding start side and the winding end side of the drum peripheral surface, respectively. The height of the existing guide pole is changed in the width direction of the magnetic tape by the displacement driving means. As a result, even when the recording trace formed on the magnetic tape has a small recording trace width, high-speed reproduction and rewinding reproduction can be performed without noise bars. A common drive source is used by connecting and operating the tilt drive means for tilting the member having the guide portion for controlling the position of the magnetic tape and the displacement drive means for displacing the height of the guide pole. The device can be configured with a simple mechanism.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific contents of the magnetic recording / reproducing apparatus of the present invention will be described in detail below with reference to the accompanying drawings. Figure 1, Figure 2,
7, FIG. 8, FIG. 13, and FIG. 14 are side sectional views of a part of the components of the magnetic recording / reproducing apparatus of the present invention, and FIGS. 5, 6, 11, and 12 show the magnetic recording / reproducing apparatus of the present invention. FIG. 3 is a side sectional view for explaining the operation of the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 1 and 2, and FIG. 4 and FIG. 10 are magnetic recording / reproducing apparatus of the present invention. 9 is an overall perspective view of the main part, FIG.
7 is a side sectional view for explaining the operation of the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 7 and 8, FIG. 15 is a front view of a VTR drum, and FIGS. 16 to 22 are front views for explaining the operation. Two
3 is a diagram showing a tape pattern. First, FIG. 18 shows a magnetic recording / reproducing apparatus when performing a recording / reproducing operation using a rotary magnetic head on a magnetic tape wound around a part of the peripheral surface of a drum composed of an upper drum and a lower drum. While keeping the position of the rotation locus surface of the rotary magnetic head with respect to the fixed portion of the machine body in a constant state, the rotation locus surface of the rotary magnetic head and the recorded trace of the magnetic tape are made to coincide with each other. FIG. 6 is a diagram illustrating a tape traveling system of a magnetic recording / reproducing device (VTR) including means for changing the traveling path of the magnetic tape on the peripheral surface of the upper and lower drums.

In FIG. 18, 1 is a machine plate, Dd is a lower drum provided with a magnetic tape position regulating guide G for regulating the position of the reference edge Te of the magnetic tape T, Du is an upper drum, and 2, 3 Is an inclined pole, SGR is a guide roller on the supply side, TGR is a guide roller on the tick-up side, and a member indicated by reference numeral CA is for position regulation of the magnetic tape for regulating the position of the reference edge of the magnetic tape. It is an annular cam member that functions as a tilt drive unit that tilts the member having the guide portion G with respect to the center axis of the rotation locus circle of the rotary magnetic head. The magnetic tape T is the above-mentioned guide roller SGR and the inclined pole 2 on the supply side.
And a magnetic tape position regulating guide portion G for regulating the position of the reference edge of the magnetic tape formed on the lower drum Dd,
In a state where the traveling path is regulated by the guide roller TGR on the tick-up side, the vehicle travels at a predetermined moving speed while slidingly contacting a part of the peripheral surfaces of the upper drum Du and the lower drum Dd,
An inclined recording mark is formed on the magnetic tape T by a rotating magnetic head rotating in a gap between the upper drum Du and the lower drum Dd. The magnetic tape T is a drum (drum structure D) including an upper drum Du and a lower drum Dd.
The outer peripheral surface of A) is wound in a range corresponding to an angle slightly larger than 180 degrees at the center angle of the drum.

FIG. 15 is a front view of the above-mentioned upper drum Du and lower drum Dd. In the drawing, Ha and Hb are rotary magnetic heads, and OO is the central axis of the above-mentioned upper drum Du and lower drum Dd. , And 0 degrees, 18 in the figure
The display of the angle of 0 degree indicates the directions of 0 degree and 180 degree indicated by expressions such as the direction of 0 degree-180 degree and the direction of 90 degree-270 degree in the description of each drawing described later. Shows. Note that the direction orthogonal to the plane of the drawing with respect to the line OO in FIG. 15 is the direction of 90 degrees to 270 degrees,
The 90 ° position is a position corresponding to the center position of the winding range of the magnetic tape on the peripheral surface of the drum on the near side in the figure.

The components forming a part of the magnetic recording / reproducing apparatus of the present invention illustrated in FIGS. 1 and 2 are wound around a part of the peripheral surfaces 4, 5 of the upper drum Du and the lower drum Dd. The rotating magnetic head Ha,
When the recording / reproducing operation is performed using Hb, the rotational magnetic field of the rotary magnetic head with respect to the fixed portion (machine plate 1) of the machine body of the magnetic recording / reproducing apparatus is maintained in a constant state, and The traveling path of the magnetic tape T on the peripheral surfaces 4 and 5 of the upper and lower drums Du and Dd is set so that the rotational locus surfaces of the heads Ha and Hb and the recorded recording marks of the magnetic tape T coincide with each other. To change the magnetic recording / reproducing apparatus, the magnetic recording / reproducing apparatus is provided with means for displacing the position regulating guide portion G of the magnetic tape for regulating the position of the reference edge Te of the magnetic tape T. Positioning guide portion G of the magnetic tape for controlling the position of the reference edge Te of the tape T
Shows a configuration example in the case of a configuration mode in which is formed on the peripheral surface of the lower drum Dd.

The constituent parts of the magnetic recording / reproducing apparatus of the present invention illustrated in FIGS. 7 and 8 are parts of the peripheral surfaces 4, 5 of the upper drum Du and the lower drum Dd. When performing the recording / reproducing operation on the magnetic tape T wound in the state of using the rotary magnetic heads Ha and Hb, the above-mentioned rotary magnetic head with respect to the fixed portion (machine board 1) of the body of the magnetic recording / reproducing apparatus is The above-mentioned upper and lower drums Du, so that the rotation locus surfaces of the rotary magnetic heads Ha and Hb and the recorded recording marks of the magnetic tape T are made to coincide with each other while keeping the position of the rotation locus surface constant. In order to change the traveling path of the magnetic tape T on the peripheral surfaces 4 and 5 of Dd, a means for displacing the magnetic tape position regulating guide portion G for regulating the position of the reference edge Te of the magnetic tape T is provided. Part of the magnetic recording / reproducing device equipped As to component, the magnetic tape T
The magnetic tape position regulation guide portion G that regulates the position of the reference edge Te is formed separately from the above-described upper and lower drums Du and Dd, and is formed below the lower drum Dd. An example of the configuration in the case where the magnetic tape is provided in the position regulating guide member GA of the magnetic tape which is arranged close to the outer peripheral surface of the small diameter portion 82 is shown.

In the components forming a part of the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 1, 2 and 7 and 8, the upper drum Du is fixed to the rotary shaft 6 of the drum motor Md. The upper drum fixing member 7 is fixed with screws 8 and 9, and the rotor 2 of the drum motor Md is fixed.
When 1 rotates at a predetermined number of rotations, the rotary magnetic heads Ha and Hb fixed to the upper drum Du are fixed to the fixed portion of the device (the book shown in FIGS. 1 and 2). A supporting member SA, which will be described later, is provided in a component forming a part of the magnetic recording / reproducing apparatus of the present invention, and is fixed in a component forming a part of the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 7 and 8. It rotates integrally with the rotating shaft 6 which is rotatably supported by bearings 10 and 11 attached to the drum Dd). Reference numeral 12 is a rotary transformer fixed to the upper drum fixing member 7, reference numeral 13 is the above-mentioned support member SA (in the case of the configuration example of FIGS. 1 and 2) or fixed drum Dd (in the case of the configuration examples of FIGS. 7 and 8). It is a rotary transformer attached to.

The head holder 15 to which the rotary magnetic head Ha is attached and the head holder 14 to which the rotary magnetic head Hb is attached are mounted on the upper drum D by screws 16 and 17.
It is fixed to u. The rotary magnetic heads Ha and Hb to be provided at positions 180 degrees symmetrical to each other in the outer peripheral direction of the upper drum Du are, for example, S respectively.
A rotary magnetic head having a configuration in which a P head and an EP head are arranged adjacent to each other, or a plurality of rotary magnetic heads (for example, 3 heads) each (for example, 3 heads) at the same time. Or a rotary magnetic head having a configuration in which recording traces can be formed in parallel,
A rotary magnetic head having any other configuration can be used. The drum structure DA to be used in implementing the magnetic recording / reproducing apparatus of the present invention is the upper drum D.
Although u can be used as a rotating upper drum (rotating drum) or as a non-rotating upper drum, it can be used in either configuration mode. The drum structure DA in the example shows an example in which the upper drum Du of the drum structure DA is configured as a rotating drum. Needless to say, even if the upper drum does not rotate, a member for rotating the rotary magnetic heads Ha and Hb is provided.

The stator member 20 of the drum motor Md is screwed to the support member SA (in the case of the configuration example of FIGS. 1 and 2) or the lower drum Dd (in the case of the configuration example of FIGS. 7 and 8). The rotor portion 21 of the drum motor Md is fixed by screws 18 and 19, and is attached by screws 23 and 24 to a support 22 fixed to the rotary shaft 6 by screws 25. The drum motor Md shown in the drawing has an armature winding 20a on its stator portion 20 and a permanent magnet 21b on its rotor portion 21. Shown as one.

First, in the constituent parts forming a part of the magnetic recording / reproducing apparatus of the present invention shown in FIGS.
B is a drum base, BP is a base plate, and SA is a support member. The above-mentioned support member SA is mounted on the mounting bosses 69 to 71 (see FIGS. 2 and 5) protruding from the drum base DB, and screws 72 are provided. , 73 fixed (boss 71
2 is not shown in FIG. 2, the mounting screws for the support member SA and the drum base DB are not shown), and the upper portion of the support member SA is the inner space of the lower drum Dd. It is provided in a manner such that it is located at. In the 90 ° -270 ° direction of the drum structure DA between the upper end portion 26 of the support member SA and the inward protruding edge portion 27 of the fixed drum Dd, as shown in (a) of FIG. Dynamic fulcrums 28 and 29 are provided. In addition, the support member SA
Has a protrusion 26a on its upper end 26 which is fixed drum Dd.
Of the spring holders 75 and 76 provided on the base plate BP which is fitted to the inner periphery of the base plate BP and is fixed to the lower end portion of the lower drum Dd by the screw 32 (FIG. 2).
Springs 30 and 31 are mounted between 5, 76 and the lower surface side of the support member SA.

Further, the holes of the spring holders 43 and 44 provided on the base plate BP and the support member S described above.
Springs 34 and 35 are mounted between the cover 33 of the drum motor Md that is integrally connected and fixed to A. 5 shows a perspective view of the base plate BP as seen from the front side, and FIG. 6 shows a perspective view of the base plate BP as seen from the back side. The positioning of the lower drum Dd to which the base plate BP is fixed with respect to the drum base DB is performed by positioning the positioning pins 45 and 46 provided on the drum base DB in the 0 ° and 180 ° directions of the drum structure on the base plate BP. It is carried out by fitting into 40 and 41 {see (b) of FIG. 1}. A member provided between the upper surface side of the drum base DB and the lower surface side of the base plate BP, and a magnetic tape position regulating guide portion G for regulating the position of the reference edge Te of the magnetic tape T on the peripheral surface thereof. An annular cam member CA (annular cam for tilt adjustment that functions as an inclination driving unit that inclines the central axis of the lower drum Dd that functions as the central axis of the rotation locus circle of the rotary magnetic heads Ha and Hb described above. Member CA) is provided. A specific configuration example of the above-mentioned annular cam member CA for adjusting the inclination of the rotating shaft is shown in FIG.

On the cam contours 58 to 63 (see FIG. 5) formed on the upper surface of the above-mentioned annular cam member CA, the cam follower 4 projecting from the above-mentioned base plate BP is provided.
9, 50 are in contact with each other, and the annular cam member CA
However, when the lower drum Dd fixed to the base plate BP is rotated about the rotation fulcrums 28 and 29, when the driving force is applied from a drive source (not shown) to rotate the lower drum Dd. , The direction of 0 ° -180 ° of the drum structure DA by a predetermined angle with respect to the central axis of the upper drum Du and the support member SA (the central axis of the rotary shaft 6) {right and left of the paper surface in FIG. 1B) Direction}, the state illustrated in FIG. 3 is obtained, but the specific configuration example of the above-mentioned annular cam member CA, the operation mode, etc. will be described in detail with reference to FIG. 5 and other drawings. See below.

FIG. 5 shows a drum base DB and a bottom surface rotatably mounted on the upper surface 36 of the drum base DB.
Concrete parts of an annular cam member CA having cam contours 58 to 63 that engage with cam followers 49, 50 {see (b) of FIG. 1 and FIG. 6} protrudingly provided on the back surface side of the base plate BP. It is a perspective view for showing a typical structural mode. The annular cam member CA is rotatably fitted to the guide portion 37 on the upper surface side of the drum base DB. Reference numeral 64 denotes a connecting portion, and an arcuate gear 65 is provided at the tip end portion. Power is supplied to the arcuate gear 65 from a drive source (not shown) via a pinion (not shown), and the annular cam member CA is moved to the upper surface 36 of the drum base DB.
When rotated upward, the cam followers 49, 50 projecting from the base plate BP are brought into contact with sequentially different cam contours 58-63 formed on the annular cam member CA. The lower drum Dd fixed to the above-mentioned base plate BP is in a direction of 0 ° -180 ° of the drum structure DA with respect to the central axis of the upper drum Dd by a predetermined angle, respectively (in the plane of FIG. 1B). Tilt in the left-right direction}. The connecting pin 74 protruding from the connecting portion 64 of the annular cam member CA will be described later with reference to FIG.

When the constituent parts of the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 1 and 2 are operating in the normal reproducing mode, the cam followers projecting from the base plate BP are driven. The body 49 abuts the cam contour 62 of the annular cam member CA for tilt adjustment and also supports the support member SA.
The cam follower 50 projectingly contacts the cam contour 59 of the annular cam member CA for tilt adjustment. Since the cam contours 59 and 62 of the annular cam member CA for tilt adjustment described above have the same height, when the magnetic recording / reproducing apparatus operates in the normal reproducing mode, the upper drum is The central axes of Du and the lower drum Dd are aligned with each other, and in this operating state, the magnetic tape T
Is in a state in which the reference edge Te of the magnetic tape T is correctly abutted over the entire area of the position regulating guide portion G of the magnetic tape formed on the outer peripheral portion of the lower drum Dd (see FIG. 18). It is possible to travel at a predetermined traveling speed in a state where the position is stably held at the regular position by the position regulating guide portion G of the magnetic tape, and in this state, a reproduction signal showing a favorable envelope is obtained.

Next, when the constituent parts of the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 1 and 2 are operating in the fast-forward reproducing mode (FF), the lower drum D
The cam follower 49 protruding from the base plate BP fixed to d contacts the cam contour 61 of the annular cam member CA for tilt adjustment, and the base plate BP protrudes from the lower drum Dd. Cam follower 5
0 is the cam contour 58 of the annular cam member CA for tilt adjustment.
Abut. The cam contour 58 of the annular cam member CA for tilt adjustment described above is configured to be higher than the cam contour 61, so that the lower position when the magnetic recording / reproducing apparatus is operating in the fast-forward reproduction mode. Drum D
The position of the central axis of d is the upper drum D when the magnetic recording / reproducing apparatus is operating in the normal reproducing mode, as shown by the straight line shown by the broken line in the direction of arrow FF in FIG.
u showing the position of the central axis of u and the lower drum Dd
In the state in which the magnetic recording / reproducing apparatus shown in FIG. 1 is in a state of being inclined to the left with respect to the straight line shown in FIG. The lower drum Dd when operating is shown in FIG.
The tilted state is as illustrated in FIG.

As a result, as the lower drum Du is inclined, the reference edge Te of the magnetic tape T is supplied to the supply side guide roller SGR in the magnetic tape position regulating guide portion G formed on the outer peripheral portion of the lower drum Dd. A part of the guide roller TGR on the take-up side is separated from the guide portion G for position regulation of the magnetic tape, and a part of the guide portion G for position regulation of the magnetic tape formed on the outer peripheral portion of the lower drum Dd. Then, since it is pushed up by the position control guide portion G of the magnetic tape, the lower drum Dd
As shown in FIG. 19, distortion (wrinkles) may occur on the magnetic tape T in the portion from the portion near the guide roller TGR on the take-up side to the guide roller TGR on the take-up side. As described above, the reference edge Te of the magnetic tape T is separated from the position regulation guide portion G of the magnetic tape at a part of the position regulation guide portion G of the magnetic tape formed on the outer peripheral portion of the lower drum Dd. Therefore, the running position of the magnetic tape T is not correctly regulated by the magnetic tape position regulation guide portion G, and the magnetic tape T is not regulated.
The running position of the magnetic tape T fluctuates in the width direction of the magnetic tape, and the magnetic tape T moves due to the rotation trajectory of the rotary magnetic head.
It is impossible to correctly track the recording trace of, and only a reproduction signal showing an envelope having a large fluctuation occurs.

When the constituent parts of the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 1 and 2 are operating in the rewinding reproduction mode (FB), they are fixed to the lower drum Dd. The cam follower 49 projecting from the base plate BP abutting contacts the cam contour 63 of the annular cam member CA for tilt adjustment, and also projects from the base plate BP fixed to the lower drum Dd. The cam follower 50 is
It contacts the cam profile 60 of the annular cam member CA for adjusting the inclination. And the above-mentioned annular cam member C for adjusting the inclination
Since the cam contour 63 of A is configured to be higher than the cam contour 60, the position of the central axis of the lower drum Dd when the magnetic recording / reproducing apparatus operates in the rewinding reproduction mode is shown in FIG. Like the straight line shown by the broken line inclining in the direction of arrow FB, it indicates the position of the central axis of the upper drum Du and the lower drum Dd when the magnetic recording / reproducing apparatus is operating in the normal reproducing mode. The solid line of -O is inclined to the right with respect to the straight line shown in the figure. Therefore, the components forming a part of the magnetic recording / reproducing apparatus shown in FIG. ), The lower drum Dd is in the inclined state as illustrated in FIG. 3B.

As a result, the reference edge Te of the magnetic tape T moves along with the inclination of the lower drum Du, and the guide roller on the take-up side in the position regulating guide portion G of the magnetic tape formed on the outer peripheral portion of the lower drum Dd. A part near the TGR is separated from the guide part G for controlling the position of the magnetic tape formed on the outer peripheral portion of the lower drum Dd, and a part near the guide roller SGR on the supply side is a guide part for controlling the position of the magnetic tape. To be pushed up by G,
As shown in FIG. 21, distortion (wrinkles) may occur in the magnetic tape T in the portion from the portion of the lower drum Dd near the supply-side guide roller SGR to the supply-side guide roller SGR. As described above, the reference edge Te of the magnetic tape T is separated from the position regulation guide portion G of the magnetic tape by a part of the position regulation guide portion G of the magnetic tape formed on the outer peripheral portion of the lower drum Dd. Therefore, the traveling position of the magnetic tape T is not correctly regulated by the position guide portion G of the magnetic tape, and the traveling position of the magnetic tape T changes in the width direction of the magnetic tape. The recording trace of the magnetic tape T cannot be properly traced due to the rotation trajectory, and only a reproduction signal showing an envelope with a large fluctuation occurs.

Therefore, in the magnetic recording / reproducing apparatus of the present invention,
The problem caused by the components forming a part of the magnetic recording / reproducing apparatus of the present invention shown in FIG. 1 and FIG. Variable height guide pole SGR
By arranging v and TGRv to change the running position of the magnetic tape, the position of the reference edge Te of the magnetic tape is made to coincide with the position regulating guide portion G of the magnetic tape provided on the lower drum Dd. So that the height of the height-adjustable guide poles SGRv and TGRv can be changed in a predetermined manner, a recording trace formed on the magnetic tape can be recorded with a recording trace width of Even if the size is small, high-speed reproduction and rewinding reproduction can be performed in a state where the noise bar does not appear, and a typical configuration example thereof is shown in FIG.

The magnetic recording / reproducing apparatus of the present invention shown in FIG.
With the position of the rotational locus surface of the rotary magnetic head with respect to the fixed portion (machine board 1) of the machine body of the magnetic recording / reproducing apparatus being maintained in a constant state, the rotational locus surfaces of the rotary magnetic heads Ha and Hb and the magnetic tape T are retained. The peripheral surfaces 4, 5 of the upper and lower drums Du, Dd described above so as to match the recorded marks of
A magnetic recording / reproducing apparatus equipped with means for displacing the guide portion G for position regulation of the magnetic tape that regulates the position of the reference edge Te of the magnetic tape T in order to change the traveling path of the magnetic tape T above. 1 and 2 in which a position regulation guide portion G of the magnetic tape that regulates the position of the reference edge Te of the magnetic tape T is formed on the peripheral surface of the lower drum Dd as a component forming a part of the magnetic tape T. The structure shown in the figure and the height-adjustable guide poles SGRv and TGRv, which are constructed as a structure that can be displaced in the width direction of the magnetic tape, are arranged in the running path of the magnetic tape. By changing the running position of the tape, the reference edge T of the magnetic tape is
The height-adjustable guide poles SGRv, TG so that the position of e can be matched with the position control guide portion G of the magnetic tape provided on the lower drum Dd.
A drive mechanism for changing the height of Rv in a predetermined manner, and a drive mechanism for changing the height of the height-adjustable guide poles SGRv, TGRv in a predetermined manner. As the above, the configuration as illustrated in FIG. 10 may be used.

By the way, in the magnetic recording / reproducing apparatus shown in FIG. 10, a structure corresponding to the constituent parts forming a part of the magnetic recording / reproducing apparatus of the present invention described above with reference to FIGS. 1 and 2. 7 and 8 has a structure as shown in FIG. 7, that is, the position of the rotary locus surface of the rotary magnetic head with respect to the fixed portion (machine plate 1) of the magnetic recording / reproducing apparatus is fixed. While keeping the state, the above-mentioned circumferential surfaces 4, 5 of the upper and lower drums Du, Dd are arranged so that the rotational locus surfaces of the rotary magnetic heads Ha, Hb and the recorded traces of the magnetic tape T may coincide with each other. In order to change the traveling path of the magnetic tape T, the magnetic recording / reproducing apparatus equipped with means for displacing the position regulating guide portion G of the magnetic tape for regulating the position of the reference edge Te of the magnetic tape T. As a component that forms a part, The magnetic tape position regulating guide portion G for regulating the position of the reference edge Te of the air tape T is formed separately from the above-mentioned upper and lower drums Du and Dd, and the above-mentioned lower drum Dd. Small diameter part 8 configured at the bottom
Since the magnetic tape is arranged in the position regulating guide member GA of the magnetic tape which is arranged close to the outer peripheral surface of the No. 2, it is first shown in FIGS. 7 and 8. Among the constituent parts corresponding to the constituent parts forming part of the magnetic recording / reproducing apparatus of the present invention having such a configuration mode, one of the magnetic recording / reproducing apparatus of the present invention described above with reference to FIG. 1 and FIG. The difference between the constituent parts forming a part will be mainly described.

In the components forming a part of the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 7 and 8, DB is a drum base and GA is a separate body from the above-mentioned upper and lower drums Du and Dd. A magnetic tape position regulating guide member GA which constitutes a magnetic tape position regulating guide portion G which regulates the position of the reference edge Te of the magnetic tape T,
A specific structure of the position regulating guide member GA for the magnetic tape is shown in FIG. The lower drum Dd has a screw 1
It is fixed to the drum base DB by 8 and 19,
A small diameter portion 82 is formed below the lower drum Dd. Rotational fulcrums 28 and 29 are provided in the direction of 90 degrees to 270 degrees of the drum structure DA in the base drum DB, as shown in FIG. The rotation fulcrum 28 engages with a hole 51 formed in the bottom portion 42 of the magnetic tape position regulation guide member GA, and the rotation fulcrum 29 regulates the magnetic tape position. It engages with a hole 52 formed in the bottom portion 42 of the guide portion GA.

A spring holder 75 provided at the bottom portion 42 of the guide member GA for regulating the position of the magnetic tape,
Springs 30, 31, 34 and 35 are mounted between the holes of 76, 53 and 54 and the intermediate bottom portion 55 of the lower drum Dd. The positioning of the lower drum Dd with respect to the drum base DB is performed by the positioning pins 45 provided on the drum base DB in the 0 ° and 180 ° directions of the drum structure.
46 is a hole 56 provided in the intermediate bottom portion 55 of the lower drum Dd,
It is performed by fitting it to 57 {of FIG.
See (b)}. Between the upper surface side of the drum base DB and the lower surface side of the intermediate bottom portion 55 of the lower drum Dd, a magnetic tape position regulating guide portion for regulating the position of the reference edge Te of the magnetic tape T on the peripheral surface thereof. An inclination adjustment functioning as an inclination driving means for inclining the central axis of the guide member GA for position regulation of the magnetic tape, which functions as a member having G, with respect to the central axes of the rotation locus circles of the rotary magnetic heads Ha and Hb. Annular cam member CA for use (annular cam member C
A) is provided. FIG. 11 shows a specific configuration example of the above-mentioned annular cam member CA for adjusting the inclination of the rotating shaft.

On the cam contours 58 to 63 (see FIG. 11) formed on the upper surface of the above-mentioned annular cam member CA, the cam followers projectingly provided on the above-mentioned magnetic tape position regulating guide member GA. When 49 and 50 are in contact with each other and the annular cam member CA is rotated by being applied with a driving force from a drive source (not shown), the annular cam member CA is With the rotation fulcrums 28 and 29 as the rotation centers, the drum structure DA is rotated by 0 degree by a predetermined angle with respect to the center axis (rotation axis 6) of the upper drum Du and the lower drum Dd.
It is tilted in the direction of 180 degrees (the left-right direction of the paper surface in FIG. 7B) to be in the state illustrated in FIG.

In FIG. 11, the drum base DB and the bottom surface of the drum base DB are rotatably mounted on the upper surface 36 of the drum base DB, and the cam is provided on the back side of the guide member GA for position regulation of the magnetic tape. FIG. 13 is a perspective view showing a specific configuration of each part of the driven bodies 49 and 50 (see FIG. 7B and FIG. 12) and the annular cam member CA having the cam contours 68 to 63 that engage with each other. . The annular cam member CA is rotatably fitted to the guide portion 37 on the upper surface side of the drum base DB. Reference numeral 64 is a connecting portion, and the arcuate gear 6 is provided at the tip portion.
5 are provided. When power is supplied to the arcuate gear 65 from a drive source (not shown) via a pinion (not shown), the annular cam member CA is rotated on the upper surface 36 of the drum base DB. Since the cam followers 49, 50 projecting from the position regulating guide member GA of the magnetic tape are brought into contact with the sequentially different cam contours 58 to 63 formed on the annular cam member CA, The guide member GA for regulating the position of the magnetic tape is
The respective directions of 0 to 180 degrees of the drum structure DA with respect to the central axis of the upper drum Dd by a predetermined angle ((b) of FIG. 7)
In the left-right direction of the paper surface in FIG.

When the components constituting a part of the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 7 and 8 are operated in the normal reproducing mode, the magnetic tape position regulating guide member GA is provided. The protruding cam follower 49 abuts the cam contour 62 of the annular cam member CA for tilt adjustment, and the protruding cam follower 50 on the magnetic tape position regulating guide member GA is , The cam profile 59 of the annular cam member CA abuts. Since the cam contours 59 and 62 of the annular cam member CA for tilt adjustment described above have the same height, when the magnetic recording / reproducing apparatus is operating in the normal reproducing mode, the upper drum is The central axes of the Du and the lower drum Dd and the guide member G for controlling the position of the magnetic tape
The magnetic tape T is in a state of being coincident with the central axis of A, and in this operating state, the reference edge Te of the magnetic tape T of the guide portion G for position regulation of the magnetic tape formed on the outer peripheral portion of the lower drum Dd. Correct contact over the entire area
(See FIG. 18), the magnetic tape T can travel at a predetermined traveling speed while the traveling position of the magnetic tape T is stably held at a regular position by the magnetic tape position regulating guide portion G. In this state, A reproduction signal having a good envelope is obtained.

Next, when the constituent parts of the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 7 and 8 are operating in the fast-forward reproduction mode (FF), the magnetic tape The cam follower 49 projecting from the position regulating guide member GA has a cam contour 61 of an annular cam member CA for tilt adjustment.
And a guide member GA for regulating the position of the magnetic tape.
The cam follower 50 projecting from the abutment contacts the cam contour 58 of the annular cam member CA for tilt adjustment. Then, the cam contour 58 of the annular cam member CA for tilt adjustment described above.
Is higher than the cam contour 61, the center axis of the magnetic tape position regulating guide member GA is shown in FIG. 17 when the magnetic recording / reproducing apparatus is operating in the fast-forward reproducing mode. Like the straight line shown by the broken line inclined in the direction of the arrow FF, O-O showing the central axes of the upper drum Du and the lower drum Dd when the magnetic recording / reproducing apparatus is operating in the normal reproducing mode. Since the position of the central axis of the magnetic tape position regulating guide member GA is inclined to the left with respect to the straight line shown in FIG. 7, the magnetic recording / reproducing apparatus shown in FIGS. The constituent members that form a part of the guide member GA for regulating the position of the magnetic tape when operating in the fast-forward reproduction mode (FF) are shown in FIG.
The tilted state is as illustrated in (a) of FIG.

As a result, the reference edge Te of the magnetic tape T is aligned with the inclination of the position regulating guide member GA of the magnetic tape in the position regulating guide member G formed on the magnetic tape position regulating guide member GA. A part of the supply-side guide roller SGR is separated from the magnetic tape position regulating guide portion G, and the take in the magnetic tape position regulating guide portion G formed in the magnetic tape position regulating guide member GA is performed. Up side guide roller TG
At a part near the R, the guide part G for position regulation of the magnetic tape
Since it is pushed up by the magnetic tape T, the magnetic tape T in the portion from the take-up side guide roller TGR side of the lower drum Dd to the take-up side guide roller TGR is distorted as shown in FIG. And the reference edge Te of the magnetic tape T is a part of the position regulating guide portion G of the magnetic tape formed on the magnetic tape position regulating guide member GA as described above. Of the magnetic tape T, the traveling position of the magnetic tape T is not correctly regulated by the position regulating guide portion G of the magnetic tape, and the traveling position of the magnetic tape T is in the width direction of the magnetic tape. In the fluctuating state, the recording trace of the magnetic tape T cannot be correctly traced due to the rotation locus of the rotary magnetic head, which causes a large fluctuation in the envelope. It happens that not only obtained reproduction signal indicating.

When the components forming a part of the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 7 and 8 are operating in the rewinding reproduction mode (FB), the magnetic tape position regulation is performed. The cam follower 49 protruding from the guide member GA contacts the cam contour 63 of the annular cam member CA for tilt adjustment, and the guide member GA for regulating the position of the magnetic tape.
The cam follower 50, which is provided so as to protrude, contacts the cam contour 60 of the annular cam member CA for tilt adjustment. Then, the cam contour 63 of the annular cam member CA for tilt adjustment described above.
Is configured to be higher than the cam contour 60, the center axis of the lower drum Dd is indicated by an arrow FB in FIG. 17 when the magnetic recording / reproducing apparatus is operating in the rewinding reproducing mode. Like the straight line shown by the broken line inclining in the direction, the solid line O-O shows the positions of the central axes of the upper drum Du and the lower drum Dd when the magnetic recording / reproducing apparatus is operating in the normal reproduction mode. Since the central axis of the position regulating guide member GA of the magnetic tape is inclined to the right with respect to the straight line, it forms a part of the magnetic recording / reproducing apparatus shown in FIGS. 7 and 8. Lower drum Dd when components are operating in fast-forward playback mode (FB)
Becomes a tilted state as illustrated in FIG. 9B.

As a result, the reference edge Te of the magnetic tape T is guided by the magnetic tape position regulating guide member GA formed on the magnetic tape position regulating guide member GA as the magnetic tape position regulating guide member GA is inclined. Part of the portion G closer to the take-up side guide roller TGR is separated from the magnetic tape position regulating guide portion G formed in the magnetic tape position regulating guide member GA, and is closer to the supply side guide roller SGR. Part of the magnetic tape is pushed up by the guide portion G for position regulation of the magnetic tape,
The magnetic tape T in the portion from the portion near the supply-side guide roller SGR of the position regulating guide member GA of the magnetic tape to the supply-side guide roller SGR has a distortion (wrinkle) as illustrated in FIG. The magnetic tape position regulating guide portion G formed on the magnetic tape position regulating guide member GA as described above
In some parts of the magnetic tape T, the reference edge Te of the magnetic tape T is separated from the position regulating guide G of the magnetic tape, so that the running position of the magnetic tape T is properly regulated by the position regulating guide G of the magnetic tape. When the running position of the magnetic tape T is changed, the running position of the magnetic tape T changes in the width direction of the magnetic tape, and the recording trace of the magnetic tape T cannot be correctly tracked due to the rotation locus of the rotating magnetic head, and an envelope with a large change is shown. It happens that only the playback signal can be obtained.

Next, with respect to the components forming a part of the magnetic recording / reproducing apparatus of the present invention described with reference to FIGS. The height-variable guide poles SGRv and TGRv, which are configured as a structure that can be displaced, are arranged to prevent noise bars from appearing even when the recording trace formed on the magnetic tape has a small recording trace width. 4 and 10 showing a specific configuration example of the magnetic recording / reproducing apparatus of the present invention capable of high-speed reproduction and rewinding reproduction, and the height-adjustable guide poles SGRv, TGR.
This will be described with reference to FIGS. 13 and 14 showing the configuration of v.

The magnetic recording / reproducing apparatus shown in FIGS. 4A and 10 respectively corresponds to the magnetic recording / reproducing apparatus of the present invention described above with reference to FIGS. 1, 2, 7 and 8. In the constituent parts that form a part, the reference edge Te of the magnetic tape T that is generated when operating in the fast-forward reproduction mode (FF) or the rewind reproduction mode (FB) is formed on the outer peripheral portion of the lower drum Dd. Tape position regulating guide portion G or magnetic tape position regulating guide member GA
In the drum structure DA, the problem that the magnetic tape position regulating guide portion G is separated from a part of the magnetic tape position regulating guide portion G and the traveling position of the magnetic tape T is not properly regulated by the magnetic tape position regulating guide portion G is described. It is a configuration mode that can be solved by changing the position of the magnetic tape running path before and after the. In the magnetic recording / reproducing apparatus shown in FIG. 4 (a), the drum structure DA used as a part of the constituent parts of the magnetic recording / reproducing apparatus has a structure as described above with reference to FIGS. The drum structure DA used as a part of the components of the magnetic recording / reproducing apparatus shown in FIG. 10 has already been described with reference to FIGS. 7 and 8. Although it has such a configuration, it does not mean that the specific drum structure DA as described above has to be used in combination.

In the magnetic recording / reproducing apparatus shown in FIG. 4A, Mg is a motor with a speed reducer, and a pinion 39 is fixed to the output shaft 38 thereof. The pinion 39 is meshed with an arcuate gear 65 provided on the annular cam member CA via a connecting portion 64. Then, when the rotational force of the motor driven according to the control operation by the control unit (not shown) is transmitted to the annular cam member CA via the output shaft 38, the pinion 39 and the connecting portion 64, the annular cam member CA. The CA changes the inclination angle of the central axis of the lower drum in the drum structure DA by the operation as described above. A connecting pin 74 is planted in the above-mentioned connecting portion 64, and the operating member F has an arc shape.
It penetrates through a hole 47 formed in the middle portion of A.
Two pieces are provided at both ends of the arcuate actuating member FA.
Actuators 77, 78, 79, 80 are provided for each.

As shown concretely in FIG. 4B, each of the actuating bodies 77 to 80 is provided with a plurality of cam contours 83 to 94, respectively. A plurality of cam contours 83 to 94 formed on each of the actuating bodies 77 to 80
The lower surface of the lower flange 95 of the height-adjustable guide poles SGRv, TGRv is abutted as a cam follower. Between the actuating bodies 77 and 78, and between the actuating bodies 79 and 80, projecting downward from the lower flanges 95 of the height-adjustable guide poles SGRv, TGRv. Gaps 98, 99 into which the cylindrical portion 97 (FIG. 13) penetrating the shaft 96 can be inserted.
Is provided. The arcuate actuating member FA is provided with elongated holes 66 and 67, and the elongated hole 6 is
6 and 67 are guide grooves 4 provided in the drum base DB.
Corresponding ones of the guide pins 100, 101 implanted in the 8, 68 penetrate.

The arcuate actuating member FA is driven by a motor Mg with a speed reducer, and the rotational force of the output shaft 38 is applied to the arcuate gear 65 via the pinion 39, whereby an annular cam member is formed. When the CA makes turns,
The connecting pin 74 planted in the connecting portion 64 integrally rotates with the connecting portion 64 in the guide groove 100 (FIG. 4) provided on the upper surface of the drum base DB. The arcuate actuating member FA is a variable height guide pole SGRv attached to the loading mechanism,
When TGRv is in the correct position to be located during the recording / reproducing operation, the gaps 98 in the two operating bodies 77, 78, 79, 80 formed at both ends of the arcuate operating member FA. A portion 99 of the drum has a tubular portion 97 protruding downward from a lower flange 95 (FIG. 13) of the height-adjustable guide poles SGRv and TGRv and having a cylindrical portion 97 penetrating a shaft 96 therebetween. Base D
Since it is constructed so as to have a curvature such that it can be pivoted by being guided by the guide grooves 48 and 68 provided in B, the arc-shaped actuating member FA as described above.
When the rotary operation is performed, the arc-shaped actuating member FA
Two actuators 77 and 7 that are configured at both ends of the
8, 79, 80 cam profile 83 ~
Sequential parts of 94 sequentially come into contact with the lower surface of the lower flange 95 of the height-adjustable guide poles SGRv, TGRv functioning as cam followers.

FIG. 13 shows a concrete configuration example of the height-adjustable guide pole SGRv on the supply side and the height-adjustable guide pole TGRv on the tick-up side, and the magnetic recording / reproducing apparatus operates in the normal reproduction mode. 2 is formed on both ends of the arc-shaped actuating member FA in the case of operating in the fast-forward reproduction mode (FF) and in the case of operating in the rewinding reproduction mode (FB). By the plurality of cam contours 83 to 94 provided on the individual actuating members 77, 78, 79, 80, the supply-side variable height guide pole SGRv and the tick-up-side variable height guide pole are described. FIG. 6 is a diagram illustrating and explaining how the height of the TGRv (the position of the running path of the magnetic tape) changes. 13 (a), (b)
Is a plurality of cams provided on the operating bodies (77, 78, 79, 80) formed at both ends of the arcuate operating member FA when the magnetic recording / reproducing apparatus is operating in the normal reproducing mode. The height of the guide poles SGRv, TGRv that can be changed in height depending on the selected one of the contours (83 to 94)
It shows a state where (the position of the running path of the magnetic tape) is restricted.

13C and 13D, when the magnetic recording / reproducing apparatus is operating in the fast-forward reproduction mode, the actuating members (7) formed at both ends of the arcuate actuating member FA are shown.
7,78,79,80) multiple cam profiles
Selected one of (83-94) 85, 92, 88,
Height adjustable guide pole SGRv, TG by 89
This shows a state in which the height of Rv (the position of the magnetic tape running path) is restricted. By the way, FIG. 1 and FIG.
When the magnetic recording / reproducing apparatus having the configuration shown in FIG. 4A using the drum structure DA shown in FIG. 4 is operating in the fast-forward reproduction mode (FF), the portion of the drum structure DA is a magnetic tape. The lower drum Dd, which functions as a member having the position control guide portion G, has a central axis of the lower drum Dd which is always held at a constant position by the operation of the annular cam member CA, and the supporting member. It is inclined by a predetermined angle with respect to the position of the central axis with respect to SA.

As a result, the reference edge Te of the magnetic tape T is provided on the outer peripheral portion of the lower drum Dd by the position regulating guide portion G of the magnetic tape provided on the lower drum Dd, as shown in FIG. A state where the formed magnetic tape is separated from a part of the position control guide portion G causes the magnetic tape T on the output side of the drum structure DA to be distorted (wrinkled), or the state of the reproduction signal to deteriorate. It is in a state where
In the magnetic recording / reproducing apparatus having the configuration shown in (a), the height of the height-adjustable guide poles SGRv and TGRv (the position of the magnetic tape running path) when operating in the fast-forward reproduction mode is Since the states shown in (c) and (d) of FIG. 13 are set, the reference edge Te of the magnetic tape T is shown in FIG.
As illustrated in FIG. 2, the magnetic tape T is guided over the entire position regulating guide portion G of the magnetic tape formed on the outer peripheral portion of the lower drum Dd, and the magnetic tape T is in a stable running state, which is good. A reproduced signal in a different state can be obtained.

Next, FIGS. 13 (e) and 13 (f) show actuating members formed at both ends of the arcuate actuating member FA when the magnetic recording / reproducing apparatus is operating in the rewinding reproducing mode. (7
7,78,79,80) multiple cam profiles
Selected one of (83-94) 83, 94, 86,
Height-adjustable guide pole SGRv, TG by 91
This shows a state in which the height of Rv (the position of the magnetic tape running path) is restricted. When the magnetic recording / reproducing apparatus having the structure shown in FIG. 4 (a) using the drum structure DA shown in FIGS. 1 and 2 is operating in the rewinding reproduction mode (FB). In the portion of the drum structure DA, the lower drum Dd that functions as a member including the magnetic tape position regulation guide portion G, and the central axis of the lower drum Dd is always held at a constant position by the operation of the annular cam member CA. The upper drum Du and the supporting member SA are inclined by a predetermined angle with respect to the position of the central axis thereof.

Accordingly, as shown in FIG. 21, the reference edge Te of the magnetic tape T is separated from a part of the magnetic tape position regulating guide portion G formed on the outer peripheral portion of the lower drum Dd. As a result, the magnetic tape T on the input side of the drum structure DA is distorted (wrinkled), or the state of the reproduced signal is deteriorated. However, FIG.
In the magnetic recording / reproducing apparatus having the configuration shown in (a), the height of the height-adjustable guide poles SGRv, TGRv (the position of the magnetic tape running path) when the magnetic recording / reproducing apparatus operates in the rewinding reproduction mode. , (E) and (f) of FIG. 13, the reference edge Te of the magnetic tape T is formed on the outer peripheral portion of the lower drum Dd as illustrated in FIG. The magnetic tape T is guided over the entire position regulation guide portion G of the magnetic tape, and the magnetic tape T is in a stable running state, so that a reproduction signal in a good state can be obtained.

The variable height guide pole SGRv and the variable height guide poles SGRv, TGRv may have the same configuration as shown in FIG. 13, and the variable height guide pole SGRv SGRv (TGRv) is
The support unit PS mounted on the substrate 102 of the loading mechanism is configured to be vertically displaceable. The support part PS is composed of two supporting components 103 and 104 which are provided so as to sandwich the substrate 102 of the loading mechanism. The support part PS is fixed to the substrate 102 of the loading mechanism by sandwiching and coupling.

Support component parts 103, 104 of the support part PS
Of the above, a hollow portion 105 is provided below the supporting component 103 provided below the substrate 102 of the loading mechanism, and the hollow portion 10 is provided.
A slit S is formed on a part of the outer wall 5. Further, the support constituent parts 103 and 104 of the support part PS described above.
The shaft 96 is inserted through the hole provided at the center of
A pin 106 is fixed to the end of the shaft 96. When the shaft 96 moves in the vertical direction, both end portions of the pin 106 are guided by the slits S provided on the outer wall of a part of the hollow portion 105 to prevent the shaft 96 from rotating. Do. A spring 107 is mounted between the pin 106 and the bottom of the hollow portion 105 so as to constantly urge the shaft 96 downward.

Further, the supporting component part 1 of the supporting part PS described above.
Of the parts 03 and 104, a small-diameter portion 97 formed above the supporting component 104 provided above the substrate 102 of the loading mechanism has a hollow portion 108a having a diameter larger than that of the shaft 96. And the hollow portion 108
In the annular space formed around the shaft 96 penetrating the center of a, the heights of the guide poles SGRv, TG are variable.
In the Rv, it functions as a guide portion when the cylindrical portion 97, which is provided so as to project downward from the lower surface of the lower flange 95 and penetrates the shaft 96, moves in the vertical direction. Reference numeral 109 denotes a roller having a length corresponding to the width of the magnetic tape, which is rotatably mounted on the shaft 96. The shaft 96 described above
An upper flange 110 is fixed to the upper end of the. Therefore, the magnetic tape T is in sliding contact with the peripheral surface of the roller 96 provided between the upper surface of the lower flange 95 and the lower surface of the upper flange 110, and the upper surface of the lower flange 95 and the upper flange. The vehicle travels in a state where the position in the width direction is restricted by the lower surface of 110.

According to the reproduction mode of the magnetic recording / reproducing apparatus,
When the above-mentioned arcuate actuating member FA is rotated and operated, the above-mentioned arcuate actuating member FA supports the support portion PS at the height-adjustable guide pole SGRv (TGRv) at the bottom surface thereof. Each of the two actuating bodies 77, 78, 79, 80 which slidably contact the end face of the small diameter portion 97 formed on the upper part of the constituent portion 104 and which are formed on both ends of the arcuate actuating member FA. The gap 9
8 and 99 are the above-mentioned variable height guide pole SG
Guide grooves 48 provided in the drum base DB in a state of sandwiching a tubular portion 97 protruding downward from the lower flange 95 of the Rv and TGRv and penetrating the shaft 96.
Guided by 68, rotation is performed.

As described above, when the arcuate actuating member FA is pivotally moved, two actuating members 77, 78, 79, which are formed at both ends of the arcuate actuating member FA, are formed.
The sequential of the plurality of cam contours 83-94 provided on 80 is shown in FIG. 13 against the underside of the lower flange 95 of the variable height guide poles SGRv, TGRv functioning as cam followers. The contact poles SGRv, TG whose height is variable according to the reproduction mode of the magnetic recording / reproducing apparatus.
Even if the magnetic recording / reproducing apparatus operates in any reproduction mode by changing the height of Rv (the position of the magnetic tape running path) to a predetermined state as shown in each of FIG. With the reference edge Te of the magnetic tape T being guided over the entire position regulating guide portion G of the magnetic tape formed on the outer peripheral portion of the lower drum Dd, the magnetic tape T is brought into a stable running state, and To obtain a reproduction signal in a good condition.

The arcuate actuating members FA shown in FIGS. 4 (a), 4 (b) and FIG. 13 (the same applies to FIG. 10 described later) are provided with two arcuate actuating members FA at each end thereof. The actuators (77,78,79,80) of the specific cam profile (8
3 to 94) are provided, the arcuate actuating member FA shown in FIG. 14 has two actuating members (shown in FIG. 14) provided at both ends thereof. Shows only one actuating member, which is displayed like FAf), but the cam contours 111, 11 having a uniform inclined surface are shown.
It is a structural example in the case of being configured as a configuration mode including 2). In addition, the operating body FAf provided at both ends of the arcuate operating member FA is also configured such that the bottom surface thereof is above the supporting constituent portion 104 of the supporting portion PS in the height-adjustable guide pole SGRv (TGRv). The two parts which are slidably contacted with the end surface of the small diameter portion 97 and which are juxtaposed in the vicinity of the tip of the small diameter portion 97 are projected downward from the lower flange 95 of the height-adjustable guide poles SGRv, TGRv. The rotary operation is performed with the tubular portion 97, which is provided and through which the shaft 96 penetrates, being sandwiched.

When an arcuate actuating member FA having an actuating member FAf provided with cam contours 111 and 112 having uniform inclined surfaces as shown in FIG. 14 is used, When the arcuate actuating member FA is pivotally moved, the cam contours 111 and 112 having uniform inclined surfaces in the actuating body FAf formed at both ends of the arcuate actuating member FA are cammed. Since the heights of the variable guide poles SGRv, TGRv contact the lower surface of the lower flange 95 of the variable height guide poles SGRv, TGRv, the height (position of the magnetic tape running path) is variable. , It will be in a state of stepless change. Height adjustable guide poles SGRv, TGRv
If the height (position of the magnetic tape running path) is changed steplessly, the height of the height-adjustable guide poles SGRv, TGRv (position of the magnetic tape running path) is changed. ) Corresponding to the stepless change mode of the upper drum Du
And supporting member SA (or upper drum Du and lower drum Dd)
It is a desirable embodiment to use an annular cam member CA having a cam profile capable of continuously changing the inclination angle of the central axis of and. Height-adjustable guide pole S shown in FIG.
Since the structures of GRv and TGRv are the same as the structures of the height-adjustable guide poles SGRv and TGRv described with reference to FIG. 13, a detailed description thereof will be omitted.

In the magnetic recording / reproducing apparatus of the present invention described with reference to FIG. 4, an annular cam member CA for changing the inclination angle of the central angle of the drum structure DA according to the reproducing mode of the magnetic recording / reproducing apparatus. Of the guide pole SGRv, T whose height is variable according to the rotational movement of the magnetic pole and the reproducing mode of the magnetic recording / reproducing apparatus.
The rotation of the arcuate actuating member FA for changing the height of GRv (position of the traveling path of the magnetic tape) is performed by using the power from one driving source. The drive source for rotating and rotating the annular cam member CA for changing the inclination angle of the central angle of the drum structure DA according to the reproduction mode of the magnetic recording / reproducing apparatus, and the reproduction of the magnetic recording / reproducing apparatus. Separately from a driving source for rotating the arcuate actuating member for changing the height of the guide poles SGRv, TGRv (position of the magnetic tape running path) whose height is variable according to the mode. Then, the magnetic recording / reproducing apparatus of the present invention may be configured. An example of the configuration is shown in FIG.
It shows in 0.

In the magnetic recording / reproducing apparatus shown in FIG.
Each of Mg, Mg1 and Mg2 is a motor with a speed reducer, and a pinion 39 is fixed to the output shaft 38 of the motor Mg with a speed reducer.
Is the rotational force of the motor driven in accordance with the control operation by the control unit (not shown) meshed with the arcuate gear 65 provided on the annular cam member CA via the connecting portion 64. By being transmitted to the annular cam member CA via the output shaft 38, the pinion 39, the arcuate gear 65, and the connecting portion 64, the annular cam member C is formed.
By the rotation of A, the lower drum Dd in the drum structure DA
The central axis of the guide member GA for position regulation of the magnetic tape provided on the outer peripheral side of the small diameter portion 82 of the upper and lower drums Du,
It is inclined with respect to the position of the central axis of Dd.

A pinion 114 is fixed to the output shaft 113 of the motor Mg1 with a reduction gear described above, and this pinion 114 is meshed with an arc gear 115 provided on an arc actuating member FAf1. Further, a pinion 117 is fixed to the output shaft 116 of the motor Mg2 with a speed reducer, and the pinion 117 is provided in the arcuate actuating member FAf2.
Meshed with 18. The above-mentioned arcuate actuating member F
A1 and FA2 are the motors Mg1 and M with the decelerator described above.
When g2 is driven in accordance with a control operation by a control unit (not shown), the motors Mg1 and Mg2 each provided with a speed reducer and the individual arcuate actuating members FA1 and FA2 are individually provided. By the power transmission by the power transmission system between them, the rotary movement is performed in the arc-shaped guide grooves 119 and 120 respectively provided in the drum base DB.
Reference numeral 121 is a long hole formed in the arcuate actuating member FA1, 122 is a long hole formed in the arcuate actuating member FA2, and 123 and 124 are pins implanted in the base plate DB. is there.

Actuators FAf1 and FAf2 are provided at one end of each of the above-mentioned arcuate actuating members FA1 and FA2. . 10 (FIG. 14)
See also)), the arc-shaped actuating member FA1
The actuator FAf1 provided at one end of the two parts has a cam profile 111 having a uniform inclined surface and a cam profile 127 having a uniform inclined surface. It is said that they are of a configuration mode in which they are arranged side by side with a gap 125 therebetween, and the operating member F has an arc shape.
The actuating body FAf2 provided at one end of A2 is composed of a portion having a cam contour 112 having a uniform inclined surface and a portion having a cam contour 128 having a uniform inclined surface.
It is said that the two portions are arranged side by side with a gap 126 therebetween.

The actuating member FAf1 provided at one end of the arcuate actuating member FA1 and the actuating member FAf2 provided at one end of the arcuate actuating member FA2 are the arcuate actuating member FA1. And the arcuate actuating member FA2, when the rotary operation is performed as described above, the bottom surface of the actuating member FA2 is located above the support constituent portion 104 of the support portion PS in the guide poles SGRv, TGRv. By the two parts which are slidably contacted with the end surface of the small diameter portion 97 and which are arranged in parallel in the vicinity of the tip of the small diameter portion 97 with a gap therebetween, the height is adjustable downward from the lower flange 95 of the guide poles SGRv, TGRv. Rotation is performed while sandwiching a cylindrical portion 97 which is projected and has a shaft 96 penetrating therethrough.

An arcuate actuating member F provided with actuating elements FAf1 and FAf2 having cam contours 111, 127, 112 and 128 having uniform inclined surfaces as described above.
When A1 and FA2 are used, when the arcuate actuating members FA1 and FA2 are rotated and actuated, the actuating members FAf1 and FAf1 formed at one end of the arcuate actuating members FA1 and FA2 are Cam profile 111, 127, 112, 128 having a uniform inclined surface in FAf2 functions as a cam follower and is a height-adjustable guide pole SGRv, TGR.
The height of the guide poles SGRv, TGRv that are variable in height because they contact the lower surface of the lower flange 95 at v.
(The position of the running path of the magnetic tape) changes steplessly. As mentioned above, the height of the guide pole S is variable.
Height of GRv, TGRv (position of magnetic tape running path)
However, in the case where the heights of the guide poles SGRv, TGRv, which are variable in height, are changed steplessly in correspondence with the stepless change mode of the height (position of the magnetic tape running path). , The upper drum Du and the support member SA (or the upper drum D
It is a preferred embodiment to use an annular cam member CA having a cam profile capable of continuously changing the inclination angle of the central axis between u and the lower drum Dd). Is.

As the cam contours formed on the actuating bodies FAf1 and FAf2 formed at one ends of the arcuate actuating members FA1 and FA2, for example, a plurality of stepwise cam contours as illustrated in FIG. Of course, the arc-shaped actuating members FA1 and FA2 may be configured.
May be integrated and rotated by one motor with a speed reducer. However, as in the magnetic recording / reproducing apparatus illustrated in FIG. 10, two arcuate actuating members FA1 and FA2 are used, and each of the arcuate actuating members FA1 and FA2 is configured at one end thereof. The heights of the variable guide pole SGRv on the supply side (the position of the magnetic tape traveling path) and the height of the variable guide pole TGRv on the take-up side (traveling of the magnetic tape) depend on the actuating elements FAf1 and FAf2. If the position of the road) can be changed individually, the height of the height-adjustable guide poles SGRv, TGRv (the position of the magnetic tape running path) can be diversified.

In the magnetic recording / reproducing apparatus shown in FIG. 10, the drive of each of the motors Mg, Mg1, Mg2 described above is controlled according to the control operation by the control unit (not shown) according to the reproduction mode, and each of the driven motors is controlled. The annular cam member CA for changing the inclination angle of the central angle of the drum structure DA as described above by applying the rotational force of
And the two circular arc-shaped actuating members FA1 and FA2 are transmitted to rotate the annular cam member CA for changing the inclination angle of the central angle of the drum structure DA according to the reproduction mode. The central angle of the drum structure DA is tilted by an angle required in each reproduction mode, and the arc-shaped actuating member FA1, according to the reproduction mode.
By rotating FA2, the actuating members FAf1 and FAf2 formed at one end of the arcuate actuating members FA1 and FA2.
The height of the guide pole on the supply side is variable by SGR
The height of v (the position of the magnetic tape running path) and the height of the take-up side variable height guide pole TGRv (the position of the magnetic tape running path) are required in each playback mode. Because the height is changed,
It is possible to always obtain a good reproduction signal regardless of the change of the reproduction mode.

In the magnetic recording / reproducing apparatus shown in FIGS. 4 and 10, the amount of rotation of the annular cam member CA to be changed in accordance with the change of the reproducing mode and the reproducing mode of the magnetic recording / reproducing apparatus are set. In order to control the amount of rotation of the arcuate actuating members FA, FA1, FA2, etc., which should be changed in accordance with the above, for example, a position sensor is provided in the above-mentioned constituent member that performs each rotation operation, and output from the position sensor. This can be easily performed by operating each drive source (motor) by a control signal generated by a control unit (not shown) based on the obtained position information. A control circuit selected from the above may be adopted.

[0070]

As is apparent from the above detailed description, the magnetic recording / reproducing apparatus of the present invention makes the position of the rotational locus surface of the rotary magnetic head constant with respect to the fixed portion of the body of the magnetic recording / reproducing apparatus. The magnetic tape, which is wound around a part of the peripheral surface of the drum consisting of the upper and lower drums, is held in the state of A member provided with a magnetic tape position regulating guide portion that regulates the position of the reference edge of the magnetic tape with respect to the central axis of the rotation locus circle of the rotary magnetic head described above by the tilt drive means. By tilting, the running path of the magnetic tape on the peripheral surfaces of the upper and lower drums is changed, and the magnetic tape is wound around a part of the peripheral surfaces of the upper and lower drums in the running path of the magnetic tape. Magnetic tape drive The height of the guide poles respectively arranged on the winding start side and the winding end side of the circumferential surface is changed in the width direction of the magnetic tape by the displacement driving means, so that the recording is formed on the magnetic tape. Even if the recorded trace has a small recording trace width, high-speed reproduction and rewind reproduction can be performed without a noise bar. Therefore, in the magnetic recording / reproducing apparatus of the present invention, Even when the inclination of the central axis of the upper drum is changed in response to the change, the reference edge of the magnetic tape is in a state of being well guided over the entire position regulating guide portion of the magnetic tape, and therefore, The running state of the magnetic tape is stabilized irrespective of the reproduction mode, and a good reproduction signal can always be obtained with certainty. In the replay mode and the rewind mode by the EP mode, a good replay image without noise bars can be obtained, and the recording trace width is 1/3 of the conventional recording trace, and three recording traces are simultaneously recorded in parallel. A good reproduced image can be easily obtained even if it is applied to a VTR that is to be reproduced.

[Brief description of drawings]

FIG. 1 is a side sectional view of a part of a component of a magnetic recording / reproducing apparatus of the present invention.

FIG. 2 is a side sectional view of a part of a component of the magnetic recording / reproducing apparatus of the present invention.

FIG. 3 is a side sectional view for explaining the operation of the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 1 and 2.

FIG. 4 is an overall perspective view of a main part of a magnetic recording / reproducing apparatus of the present invention.

FIG. 5 is a perspective view of a part of the components of the magnetic recording / reproducing apparatus of the present invention.

FIG. 6 is a perspective view of a part of the components of the magnetic recording / reproducing apparatus of the present invention.

FIG. 7 is a side cross-sectional view of part of the components of the magnetic recording / reproducing apparatus of the present invention.

FIG. 8 is a side cross-sectional view of part of the components of the magnetic recording / reproducing apparatus of the present invention.

9 is a side sectional view for explaining the operation of the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 7 and 8. FIG.

FIG. 10 is an overall perspective view of a main part of the magnetic recording / reproducing apparatus of the present invention.

FIG. 11 is a perspective view of a part of the components of the magnetic recording / reproducing apparatus of the present invention.

FIG. 12 is a perspective view of a part of the components of the magnetic recording / reproducing apparatus of the present invention.

FIG. 13 is a side sectional view of a part of a component of the magnetic recording / reproducing apparatus of the present invention.

FIG. 14 is a side sectional view of a part of the components of the magnetic recording / reproducing apparatus of the present invention.

FIG. 15 is a front view of the drum of the VTR.

FIG. 16 is a front view for explaining the operation.

FIG. 17 is a front view for explaining the operation.

FIG. 18 is a front view for explaining the operation.

FIG. 19 is a front view for explaining the operation.

FIG. 20 is a front view for explaining the operation.

FIG. 21 is a front view for explaining the operation.

FIG. 22 is a front view for explaining the operation.

FIG. 23 is a diagram showing a tape pattern.

[Explanation of symbols]

DB ... Drum base, Du ... Upper drum, Dd ... Lower drum, DA ... Drum structure, Md ... Drum drive motor, H
a, Hb ... Rotating magnetic head, T ... Magnetic tape, Te ... Reference edge of magnetic tape, SA ... Support member, CA ... Annular cam member, G ... Guide portion of reference edge of magnetic tape, Mg, Mg
1, Mg2 ... Motor, 6 ... Rotating shaft, 10, 11 ... Bearing,
39, 114, 117 ... Pinion, 65 ... Arc rack, 12, 13 ... Rotating transformer,

Claims (4)

[Claims] 1. A magnetic recording / reproducing apparatus for performing a recording / reproducing operation on a magnetic tape wound around a part of a peripheral surface of a drum composed of an upper drum and a lower drum by using a rotary magnetic head. While keeping the position of the rotation locus surface of the rotary magnetic head with respect to the fixed part of the machine body in a constant state, the rotation locus surface of the rotary magnetic head and the recorded trace of the magnetic tape are made to coincide with each other. In a magnetic recording / reproducing apparatus having means for changing the running path of the magnetic tape on the peripheral surface of the upper and lower drums, a magnetic tape position regulating guide portion for regulating the position of the reference edge of the magnetic tape is provided. Inclination driving means for inclining the above-mentioned member with respect to the central axis of the rotation locus circle of the above-mentioned rotary magnetic head, and winding around a part of the peripheral surface of the above-mentioned upper and lower drums in the traveling path of the above-mentioned magnetic tape. Magnetic A magnetic recording / reproducing apparatus comprising displacement driving means for changing the heights of guide poles arranged on the winding start side and the winding end side of the tape around the drum circumferential surface in the width direction of the magnetic tape. 2. An inclination driving means for inclining a member having a magnetic tape position regulating guide portion for regulating a position of a reference edge of the magnetic tape with respect to a central axis of a rotation locus circle of the rotary magnetic head. , A rotation provided in a plane including a straight line parallel to the central axes of the upper and lower drums and an intermediate position of the winding range of the magnetic tape in the upper and lower drums, and the central axes of the upper and lower drums. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the magnetic recording / reproducing apparatus is configured so as to be able to perform a rotation operation at a predetermined angle with a fulcrum as a rotation center. 3. The magnetic tape, which is wound around a part of the peripheral surface of the upper and lower drums in the running path of the magnetic tape, is arranged on each of a winding start side and a winding end side of the drum peripheral surface. The displacement driving means for changing the height of the guide poles in the width direction of the magnetic tape is provided with a cam profile that individually abuts the individual cam followers of the two guide poles. The positions of the individual cam followers on the two guide poles are set so that they can be moved by contacting the cam followers on the two predetermined guide poles. 2. The magnetic recording / reproducing apparatus according to claim 1, further comprising an actuating member which can be moved so as to include. 4. A magnetic recording / reproducing apparatus for performing a recording / reproducing operation using a rotary magnetic head on a magnetic tape wound on a part of a peripheral surface of a drum composed of an upper drum and a lower drum. While keeping the position of the rotation locus surface of the rotary magnetic head with respect to the fixed part of the machine body in a constant state, the rotation locus surface of the rotary magnetic head and the recorded trace of the magnetic tape are made to coincide with each other. In a magnetic recording / reproducing apparatus having means for changing the running path of the magnetic tape on the peripheral surface of the upper and lower drums, a magnetic tape position regulating guide portion for regulating the position of the reference edge of the magnetic tape is provided. Inclination driving means for inclining the above-mentioned member with respect to the central axis of the rotation locus circle of the above-mentioned rotary magnetic head, and winding around a part of the peripheral surface of the above-mentioned upper and lower drums in the traveling path of the above-mentioned magnetic tape. Magnetic Displacement driving means for changing the heights of the guide poles arranged on the winding start side and the winding end side of the tape on the drum peripheral surface in the width direction of the magnetic tape, and for the position regulation of the magnetic tape described above. A magnetic recording / reproducing apparatus comprising: an inclination driving means for inclining a member having a guide portion; and a means for connecting and coupling a displacement driving means for changing a height of a guide pole in a width direction of a magnetic tape.