JPH0652595B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to magnetic recording / reproducing equipped with a mode operation mechanism for controlling the running state of a tape attached to a tape guide drum having a VTR or the like rotating magnetic head. The present invention relates to an apparatus, and more particularly to a magnetic recording / reproducing apparatus in which a mode operating mechanism is small and lightweight.

[Conventional technology]

The mechanism of the magnetic recording / reproducing apparatus can be roughly classified into a loading mechanism and a mode operating mechanism. In particular, as a mode operation mechanism for controlling the running state of the tape wound around the tape guide drum equipped with the rotating magnetic head,
Along with the sophistication of the device and the diversification of the tape running control form, a complicated mechanism is required. On the other hand, in a VTR-integrated camera, which has been forming an active market in recent years, it is an essential subject to thoroughly reduce the size and weight. Therefore, conventionally, as a mode operation mechanism, a method in which each operation mechanism element is operated by a wheel provided with a cam groove via an arm, a slider, etc. is known. It is suitable for downsizing, weight reduction, cost reduction, power consumption reduction, etc. of the device compared to the one using an actuator such as. As a device provided with this kind of mode operation mechanism, there is, for example, JP-A-60-18848.

[Problems to be solved by the invention]

In the above prior art, the distance between the wheel provided with the cam groove and each mechanical element such as a pinch roller is long, and a transmission member such as an arm slider is required between the wheel and each mechanical element. There was a limit to the number of points that could be reduced, and there was a problem in reducing the size and weight of the device. In addition, the error of each member accumulates in order to operate each mechanical element through a large number of members,
There was also a problem in terms of operational reliability.

On the other hand, the applicant has proposed a mode operation mechanism represented by Japanese Patent Application No. 60-82434. This is because the cam surface of a ring-shaped cam member is arranged in the vicinity of each mechanical element and these mechanical elements are directly operated by the cam surface, thereby reducing the number of parts and improving the reliability of the operation. is there.

However, the above-mentioned device proposed by the applicant of the present invention can reduce the plane area of the device to some extent by arranging the respective mechanical elements close to each other on the cam surface of the ring-shaped cam member. We have not been able to fully meet the demand for thinner products. In other words, in recent VTR-integrated cameras, the small-diameter tape guide drum system has become the mainstream due to the demand for smaller size and lighter weight, and the tape guide drum is installed under the front lid with the cassette open. A system is adopted in which the plane area of the mechanism device is reduced by disposing the mechanism device. Therefore, because of the small-diameter drum system, three-dimensional loading by wide-angle tape wrapping is necessary, and because the tape guide drum is arranged below the cassette lid, the upstream side of the tape guide drum is On the other hand, it is necessary for the tape to run parallel from the cassette to a predetermined loading position, and on the tributary side of the tape guide drum, the tape should run diagonally downward toward the predetermined loading position. In this way, the position of the tape guide drum in the height direction of the apparatus is restricted, and the tapes such as the tape guide groups on the input side (upstream) and the output side (downstream) of the tape guide drum and the tape guide group drive member The loading mechanism is
Since a considerable thickness (height) is required to make the traveling path that descends obliquely, the height of the device becomes a large value even with this alone. However, in the device proposed by the present applicant, since the cam member for controlling the mode operating mechanism is formed in a ring shape, the cam member and the mode operating mechanism are arranged as close to the center as possible in a flat area. If it is attempted to reduce the distance, if it is located below the lowermost position of the moving path of the loading member such as the tape guide group that descends, then it will have to be arranged on the downstream side. Therefore, the thickness for providing the ring-shaped cam member and the like is further added, and the thickness of the entire apparatus has become a considerably large value.

If the cam member or the mode operation mechanism can be arranged near the central tape guide drum and so as not to go below the lowermost position of the loading member such as the tape guide, if the structure of the apparatus is The thickness of the entire device can be further reduced by the method proposed by the present applicant without increasing the plane area.

Another problem in the proposed device is whether the stroke of the mode operating mechanism controlled by the cam member, for example, the pinch roller pressing mechanism for the capstan, can be sufficiently obtained. This pinch roller
A shaft that rotates at a constant speed when the pressure contact is released (capstan)
Since it is advantageous to install the cassette farther away from it, it is necessary to increase the stroke thereof. To increase the stroke of the mode operation mechanism, it is necessary to increase the stroke of the cam. However, in the case of using a ring-shaped cam as the above-mentioned proposed device and arranging the operating mechanism in close proximity, the cam stroke is maximum and the radial width of the ring is limited, and a larger size You can't get a stroke. Further, due to the necessity of the above-mentioned close arrangement, the dimension of the member controlled by the cam such as the pinch roller actuating arm cannot be made sufficiently long.
If the above-mentioned width of the cam member is widened, or if the mode operation mechanism is made larger and is arranged away from the ring cam member, the flat area becomes large and it becomes impossible to be compact. .

Therefore, an object of the present invention is to provide a magnetic recording / reproducing apparatus equipped with a mode operation mechanism capable of overcoming the problems of the above-described conventional techniques and achieving a thinner and more compact device than the above-described various conventional techniques. To do.

[Means for solving problems]

In order to achieve the above-mentioned object, the magnetic recording / reproducing apparatus of the present invention is configured by an arcuate cam member rather than a ring-shaped cam member as a control member for controlling a mode operation mechanism for switching various modes of tape drive. The cam member has a radius substantially the same as that of an arc-shaped tape guide driving member for tape loading, and is located around the tape guide drum at a position higher than the lower end of the final loading position of the tape guide that descends during loading. It is arranged so as to rotate together with the tape guide driving member. In this case, the length in the rotation direction of the cam member, that is, the arc length and the position occupied during rotation are set so as not to interfere with the descending tape guide.

In a preferred embodiment, the mode operating mechanism includes an arm member that operates a pinch roller, the arm member extending from the outside to the inside across the rotation track of the cam member. Further, the arcuate cam member is configured to operate the arm member by engaging an end surface portion at the tip in the arc direction or a cam portion continuous with the end surface portion with the arm member.

[Action]

As described above, since the cam member that controls the mode operation mechanism and drives the tape guide driving member is formed in an arc shape instead of a ring shape, its length and position during rotation (rotation range) And the timing of the rotation) are appropriately designed so that the height of the cam member is higher than the lower end of the tape guide at the final loading position (lowermost position), for example, the arc-shaped tape guide drive. Even at a height position with the same radius as the member and directly below the member, the tape guide can be designed so that the cam members do not interfere with each other by the cam members interfering with the tape guides that obliquely descend due to loading. The tape guide drive member and the cam member are naturally lower than the height position of the upper end of the tape guide (for example, the tape guide on the entry side) that pulls the tape in parallel to the loading position. Therefore, unlike the above-mentioned conventional technique, the cam member does not need to have a thickness below the tape guide at the lowest position, and can be thinner than the device as a whole.

Further, the cam member is formed in an arc shape, and an arm for a tape drive member such as a pinch roller is arranged as a mode operation member from the outside to the inside across the rotation locus, and the end surface portion in the arc direction of the cam member is arranged. Since this arm is operated, the stroke of the cam member or the mode operating member can be made sufficiently large even when the mode operating member is arranged close to the cam member.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 2 is a plan view of a magnetic recording / reproducing apparatus according to the present invention, in which 1 is a palm, 2 is a tape guide drum for mounting a rotating magnetic head, and a tape is obliquely wound at a predetermined angle, 3 is a supply reel 4 and a take-up reel. A cassette containing a tape 6 wound around 5, a capstan 7 to which a motor 9 is directly connected to the lower end, 8 a pinch roller, 10 an erasing head for erasing the entire width of the tape 6, and 11 upper and lower ends of the tape 6. It is an audio control head for recording and reproducing audio signals and control signals. Cassette 3
Is attached to the apparatus, the lid 12 on the front surface of the cassette 3 is opened. Further, the tension pin 16, the guide roller 17, and the tilt pin 18 are inserted into the opening 13, and the opening 14
The guide roller 19 and the inclined pin 20 are inserted therein,
The inclined pin 21 and the capstan 7 are inserted into the opening 15 at the positions indicated by broken lines and solid lines, respectively. At this time, the pinch roller 8 is also in the position shown by the broken line. When the loading operation is performed, each guide moves while pulling out the tape 6. The guide roller 17 and the inclined pin 18 are combined to be the first
That is, it forms a tape guide group on the input side, moves horizontally as a unit, and is positioned near the tape guide drum 2. The guide roller 19 and the inclined pin 20 are combined to form a second
That is, the tape guide group on the output side is formed and integrally formed, and is horizontally positioned up to the vicinity of the audio control head 11 and thereafter moved diagonally downward to be positioned near the tape guide drum 2. The tape 6 is wound around the guide drum 2 by approximately 270 °. The tilt pin 21 moves horizontally from the back of the tilt pin 20 and is fixed on the upstream side of the audio control head 11, and corrects the attitude of the tape 6 and guides it to the take-up reel 5. As a result, the tape 6 comes out of the cassette 3, and the tension pin 16 and the height regulation guide 2
2. The tape guide drum 2 is spirally wound around the tape guide drum 2 through the erasing head 10, the guide roller 17, and the inclined pin 18, and the guide roller 19, the inclined pin 20, and the inclined pin 21,
Fixed guide 23, audio control head 1
1, the height regulating guide 24, the fixed guide 25, the capstan 7 and the pinch roller 8 in pressure contact with each other to drive the winding reel 5. FIG. 5 is a side view of the magnetic recording / reproducing apparatus after completion of loading, and FIG. 6 is a side view of the same apparatus after completion of unloading. In FIG. 5, 26
The guide roller 17 and the inclined pin 18 are erected on the guide base, and the guide roller 10 and the inclined pin 20 are erected on the guide base 27, and similarly, the guide roller 10 and the inclined pin 20 are erected by the guide 28 on the guide base. It As shown in the figure, the tape guide on the exit side of the tape guide drum 2 is descended by a width substantially larger than that on the entrance side. This reduces the inclination angle of the tape guide drum 2 and arranges the tape guide drum 2 at a position slightly lower than the cassette 3 to allow the cassette 3 to be attached when the cassette is mounted.
The tape guide drum 2 can be arranged under the front lid 12 that opens to the front of the device to achieve a compact and thin device.

Next, the loading mechanism will be described in detail. FIG. 7 shows the guide moving member on the exit side. The guide base 27 on which the guide roller 19 and the inclined pin 20 are planted is rotatably supported by a connecting plate 29 in a plane as shown by an arrow in the figure, and the connecting plate 29 is also similarly shown by another arrow. It is rotatably supported in the plane by the connecting plate 30. Further, the connecting plate 30 is supported by one end of the output side drive member 31 so as to be swingable in the vertical direction as shown by another arrow. The outlet drive member 31 has an arc shape, and a gear portion 31a is provided on the outer periphery thereof. FIG. 8 shows the guide moving member on the entrance side. A guide base 26 for arranging the guide roller 17 and the inclined pin 18
Is rotatably supported by a connecting plate 32 in a plane as indicated by an arrow, and the connecting plate 32 is rotated by a U-shaped portion 33b provided at one end of the entrance side drive member 33 as indicated by another arrow. It is movably supported. Since the output side driving member 31 moves inside the U-shaped portion 33b, that is, above the input side driving member 33 and below the connecting plate 32, both the driving members or the driving member and the guide group are moved during the movement. There is no collision. The movement path of the guide group will be described with reference to FIGS. 12 and 13 described later. The entry side drive member 33 is also arcuate in shape, and a gear portion 33a is provided on the outer periphery thereof. FIG. 9 shows the cam 34. The cam 34 is composed of two upper and lower stages, the upper stage has a gear portion 34a and a cam portion 34d from the left side, the lower stage has a stopper surface 34b corresponding to a Geneva gear (described later), and a cam portion 34c corresponding to a mode operation after loading. There is a cam portion 34f corresponding to the loading / unloading process and a cam portion 34e corresponding to the mode operation after the unloading. As a particularly important feature, the entire shape is an arc shape. These are arranged on the palm 1 in the order of the outlet drive member 31, the inlet drive member 33, and the cam 34 from the top in a concentric manner and with the same radius.

FIG. 1 shows the upper stage of the cam 34 and the drive system. (A) shows the unloading, (b) shows the loading / unloading process, and (c) shows the loading state. The cam 35 includes a gear 35 driven by a drive source (not shown)
It is driven by engaging with 4a. When the cam 34 rotates, the gear 36 that meshes with the gear portion 34a rotates, and the delivery-side drive member 31 passes through the gears 37 and 38 and then the gear 3.
The gear 39, which rotates integrally with the gear 8 through a compression spring (not shown), is driven by being engaged with the gear portion 31a. Similarly, the entry side drive member 33 is driven by a gear 41a (see FIG. 11 to be described later) incorporating a compression spring (not shown) via the gears 40 and 41 meshing with the gear portion 33a. When the loading is completed (c), the rotation of the gear 36 is stopped by the Geneva gear, which will be described later, and the engagement between the gear 36 and the gear portion 34 is released. On the other hand, in the state of (a), the tip end of the arm 42 is further inside the movement path (rotation locus) of the cam 34, and the pinch roller 8 is separated from the capstan 7 by a larger distance. Next, in the state of (b) during loading, the tip end of the cam 34 and the arm 42 are engaged, and the arm 4
2 rotates about the fixed shaft 43, and rotates the arm 44 counterclockwise about the shaft 45. The arm 44 has a shaft 47
The arm 46 via the arm 46,
Since the arm 48 is engaged with the pinch roller mounting shaft 49 of FIG. 1 and the arm 48 is rotatably mounted around the fixed shaft 50, this rotation of the arm 44 causes the arm 48 to rotate in the direction opposite to the arrow A. Then, the pinch roller 8 pivotally supported by the arm 48 is moved to the loading position. Since the arm 48 is biased in the direction of arrow A by a spring (not shown),
In the state (a) where the cam 34 and the arm 42 are not engaged, the pinch roller 8 is retracted to the unloading position.
When the cam 34 further rotates from the state of (b) to the state of (c), the arm 42 engages with the cam portion 34d, and the pinch roller 8 is pressed against the capstan 7 by the toggle mechanism formed by the arms 44 and 46. To do. The shaft 45 is erected on an arm 51 that is rotatably supported around a fixed shaft 52, and
1 is always pulled counterclockwise by the spring 53 and top 5
Since the position of the pinch roller 8 is regulated by 4, the arm 51 is rotated against the spring 53 even after the movement of the pinch roller 8 is stopped, and the arm 51 is separated from the stopper 54, so that the pinch roller and the capstan are pressed against each other. Power is secured.

The input drive member 33, the output drive member 31, and the cam 3 described above.
The number 4 is a system in which it is rotatably supported by a common member and moves on the same radius of rotation, so that the number of parts can be effectively reduced. It should be noted that each drive member and the cam can be supported by different support members.

FIG. 10 shows the lower stage of the cam 34 and the mode operating mechanism,
(a) shows unloading, (b) shows loading / unloading, and (c) shows loading. 36
Reference numeral a is a Geneva gear portion provided integrally with the gear 36.
One end of the arm 55 is engaged with the cam portion 34c or 34e, and is biased in the counterclockwise direction around the shaft 56 by the spring 57 attached to one end. A brake member 58 is attached to the other end of the arm 55 and applies a braking force to the supply reel base 59. The arm 60 has a cam portion 34c or 34
It is engaged with e and is urged clockwise about a shaft 62 by a spring 61 attached at one end. The arm 63 has an arm 63a engageable with the shaft 60a on the arm 60, and a spring 65 is attached to one end of the arm 63 to urge the arm 63 around the shaft 62 in a counterclockwise direction. Further, a brake member 64 is attached to the other end to apply a braking force to the drive disk 66 that engages with the take-up reel 5. (a) shows a stopped state after unloading, the arm 55 is engaged with the concave portion of the cam portion 34e, and the braking force is applied to the supply reel base 59. At this time, since the concave portion and the arm 55 are not directly engaged with each other, the braking force is increased by the spring 5.
It is determined only by the force of 7 and is stable regardless of the stroke of the cam portion 34e. Further, the arm 60 engages with the convex portion of the cam portion 34e, and opposes the spring 61, so that the shaft 60a and the arm 63a.
Since the engagement is released, the braking force is applied to the drive disk 66 only by the urging force of the spring 65, and the driving disk 66 can be stably secured regardless of the stroke of the cam portion 34e. In the state of (b),
The arms 55 and 60 are engaged with the cam portion 34f, and only the braking force applied to the supply reel base 59 is released. Therefore, when loading, the tape 6 is basically delivered from the supply reel side. When the state (a) is changed to the state (b), the arm (60) once falls into the concave portion of the cam groove 34e, at which time the brake 64 is released. This mode is F
In the F / REW mode, at the same time, since the arm 55 is riding on the convex portion, the brake 58 is also disengaged. Therefore, both brakes 64 and 58 are released and the FF / REW mode is set. However, when FF / REW is not performed and loading is performed directly from the unloading stop state, there is a possibility that the take-up reel will rotate and the excess tape will be pulled out due to the brake 64 being momentarily released. However, in reality, the moment is extremely short, there is a certain level of axial loss of the take-up reel stand, loading operation is performed immediately, and the tape guide group moves forward. , Has not reached a big problem. The state (c) shows the recording / reproducing state, and the braking force is applied to the supply reel base 59, but the arm 60 is engaged with the concave portion of the cam portion 34c and is rotated by the pulling force of the spring 61, and the shaft is rotated. 60a engages with the arm 63a to move the arm 63 to the spring 65.
The brake force to the drive disk 66 is released by rotating the drive disk 66 in the opposite direction. At this time, since the Geneva gear portion 36a of the gear 36 and the stopper both 34b are engaged with each other, the driving force from the gear 35 is cut by the gear 36, the rotation after the gear 36 is stopped, and the driving members 31 and 33 are stopped. The pressure force of each tape guide group to the positioning member is maintained. The pressing force at this time is the same as the above-mentioned gear 38 and gear 39.
And the pressure-bonding spring built in the gear 41a. In this way, by transmitting the movement of the cam 34 to the drive member via the switching mechanism such as the Geneva gear, it is possible to easily cope with the increase in the number of operation modes.

FIG. 11 shows the above-mentioned three driving members 31 and 33,
It shows the movement of the cam 34. When (a) is an eject,
(E) is the completion of loading, and (f) is the mode operation such as recording / playback. The shape of each member is simplified and shown in an arc shape. Reference numeral 67 is a support roller for supporting each member, 67b and 67c contacting the driving members 31 and 33 and the cam 34 from the inner circumference are cylindrical rollers, and 67a and 67d contacting from the outer circumference are gears. As shown in FIG. 8, with respect to the movement of the cam 34, the entrance side drive member 33 rotates in the opposite direction at substantially the same speed, and the exit side drive member 31 rotates in the same direction at a nearly double speed reduction. As described above, the driving member and the cam are concentrically arranged and supported by the coaxial roller, so that the number of parts can be reduced.

As is clear from FIG. 11, the arc length of the cam 34 and the position occupied during rotation are attached to the tip of the delivery side drive member 31 at any point of (a) to (e) and directed toward the loading position. Output tape guide 19, which descends diagonally,
20 (omitted in FIG. 11) is set so as not to hit. Therefore, the cam 34 includes the guide group 1
It can be arranged at a position sufficiently higher than the lowest position of 9, 20.

FIG. 3 is a perspective view of the carrier 28 as seen from the guide drum 2 side. The tape guide drum 2 has an integrated structure for positioning the tape guide groups on the input side and the output side of the tape guide drum 2. For the tape guide group on the entry side, the shaft portion at the bottom of the guide roller 17 is positioned by the V groove 28a, and the upper portion is made by the U groove 28.
It is regulated by b to prevent the guide roller 17 from collapsing in a direction perpendicular to the entering direction. The height of the guide roller 17 is regulated by the upper end of the guide base 27 coming into contact with the stopper surface 28c. The inclination of the inclined pin 18 is determined by the side surface of the guide base 27 contacting the wall 28d. The same applies to the tape guide group on the output side.
The position and angle are determined by the V groove 28e and the U groove 28f, and the height is determined by the stopper surface 28g. The inclination of the inclined pin 20 is restricted by the wall 28h. Furthermore, the V of the chassis 28
A cutout portion 28i is provided between the groove 28e and the U groove 28f. FIG. 4 is a side view of the apparatus with a part of the catch 28 in cross section, (a) showing an unloading state and (b) showing a loading completed state. In the unloading state, one end of the cam 34 and one end of the exit side driving member 31 penetrate through the cutout portion 28i, but since these members escape from the cutout portion 28i by the loading operation, in the loading completion state. Can hold the guide roller 19 and the tilt pin 20 in place. As described above, the notch portion is located at the position where the tape guide group is moved obliquely during loading, and the drive members on the exit side and the entry side are inserted into the positions at the time of unloading.

FIG. 12 is a perspective view showing the guide member 68 of the tape guide group, and FIG. 13 is a side view showing the support structure of the tape guide group by the guide member 68. The guide member 68 has an integral structure having a guide portion of the entrance tape guide group and a guide portion of the exit tape guide group, and the tip of the guide portion of the exit tape guide group descends along the tape running path. It has a descending part. The tip end 68a of the cross section of the guide member 68 is engaged with the guide base 26 or 27 so as to be gripped, and regulates the movement path of the guide base 26 or 27.

In this way, since the movement paths of the output side guide groups 19 and 20 and the input side guide groups 17 and 18 are determined by the guide member 68,
The radius of gyration of the drive members 31 and 33 does not necessarily match. However, during most of the loading period, these guide groups pass almost on the movement loci of the drive members 31 and 33.

FIG. 14 shows a moving mechanism of the inclined pin 21 arranged on the exit side. The delivery side drive member 31 and the support roller 67d engage at an approximately intermediate position between (c) and (d) shown in FIG. The gear portion of the support roller 67d is engaged with the gear 69,
After the gear 70 integrated with the gear 69 has reduced the speed to about 1/2, the gear 73 is rotationally driven via the gears 71 and 72. Gear 73
Is coaxially engaged with the arm 74 via a crimp spring (not shown), and the tilt pin 2 is implanted at the tip of the arm 74.
1 is moved to a predetermined position defined by the cache 75 and pressure-bonded. In addition, the tilting pin 21 at the above timing
The tilting pin 21 is loaded following the rear of the guide base 27 by driving. That is, since the movement loci of the inclined pin 21 and the guide base 27 partially overlap, when the guide base 27 precedes and passes through the overlapping portion, the delivery side driving member 31 and the support roller 37d engage with each other to form the inclined pin. The position of the support roller 67d and the speed reduction ratio of the arm 74 drive system are set so as to drive 21. Therefore, since the movement of the arm 74 is controlled by the movement of the output side drive member 31, the interference at the overlap portion is caused. There is no. Further, since the single output roller 67d supports the output drive member 31 and transmits the drive force, the number of parts can be reduced.

〔The invention's effect〕

As described above in detail, in the magnetic recording / reproducing apparatus of the present invention, since the cam member for controlling the tape driving mode operation mechanism is formed in an arc shape, the height of the cam member of the tape guide is lowered for loading. It is set to a position slightly higher than the lower end at the lowest position, the turning radius of the cam member matches the turning radius of the tape guide driving member, and the movement of the tape guide descending due to the loading is prevented at any time. It is possible to design the arc length and rotation range of the cam member so that the above does not occur, thereby making it possible to sufficiently reduce the plane area of the device and to make the device thinner than the conventional device. It has an effect that can be achieved. Further, since the mode operation mechanism can be controlled by the end face portion of the arcuate cam member, there is an effect that a large cam control stroke can be obtained.

[Brief description of drawings]

FIGS. 1 (a), (b), and (c) are plane views showing a state of an embodiment of a drive unit of a cam member of a magnetic recording / reproducing apparatus of the present invention at the time of unloading, during the loading operation, and at the completion of loading. 2 and FIG. 2 are plan views of a magnetic recording / reproducing apparatus to which the present invention is applied, FIG. 3 is a perspective view of a cartridge (tape guide positioning mechanism), and FIGS. 4 (a) and 4 (b) are exit side loading mechanisms. Side views of the apparatus of FIG. 2 at the time of unloading and loading, FIG. 5 and FIG. 6 are side views of the apparatus of FIG. 2 at the time of completion of loading and unloading, and FIG. FIG. 8 is a perspective view of the guide group, FIG. 8 is a perspective view of the entry side tape guide drive member and the entry side tape guide group, and FIG. 9 is a perspective view of the cam.
(a), (b), and (c) are plan views showing the states of the mode operation member by the cam during unloading, during the loading, and when the loading is completed, and FIG. 11 shows the operation of the tape guide drive member and the cam. FIG. 12 is a timing diagram, FIG. 12 is a perspective view of the tape guide guide member, FIG. 13 is a side view of FIG. 12, and FIG. 14 is a plan view of the output side inclined pin drive mechanism. 1 ... Sheath, 2 ... Tape guide drum, 3 ... Cassette, 4 ... Supply reel, 5 ... Take-up reel, 6 ... Tape, 7 ... Capstan, 8 ... Pinch roller, 1
7, 19 ... Guide roller, 18, 20, 21 ... Inclined pin, 26, 27 ... Guide base, 28 ... Catch, 31 ... Outgoing tape guide driving member, 33 ... Incoming tape guide driving member , 34 ... Cam (control member), 3
6, 37, 38, 39, 40, 41, 41a ... Gear mechanism, 42 ... Pinch roller operating arm (mode operating member), 55, 60 ... Reel brake operating arm (mode operating member), 67 ... Support Roller, 68 ... Guide member for tape guide.

Claims (4)

[Claims] 1. A tape guide drum on which a rotating magnetic head is mounted, and tape guides on the input side and the output side for drawing a magnetic tape from a cassette and winding the magnetic tape around the tape guide drum to form a tape running path. One of the tape guides on the output side and the output side is horizontally reciprocated between the unloading position and the loading position, and the other tape guide is reciprocated between those positions in such a manner that it descends toward the loading position at least in the latter stage of the loading. An input-side and output-side arcuate tape guide drive member to be driven, and a mode operation mechanism for switching the operation mode of the magnetic tape.
In a magnetic recording / reproducing apparatus provided with a control member for controlling the mode operation mechanism, the control member has an arc shape having a cam surface for controlling one of the mode operation mechanisms on at least one of an inner circumference and an outer circumference. The tape guide drum is arranged so as to rotate around the tape guide drum at substantially the same radius as the tape guide drive member and at a position higher than the lower end of the other tape guide at the loading position, and the drive is also provided. The magnetic recording / reproducing apparatus is characterized in that the arc length of the control member and the position during rotation are set so as not to hinder the lowering of the other tape guide. 2. The mode operating mechanism includes an arm member that operates a pinch roller that presses a magnetic tape against a capstan, and the arm member extends from the outside to the inside across a rotation locus of the control member when not operating. The magnetic member according to claim 1, wherein the control member is configured to operate the arm member by engaging a cam portion including an end face portion in the arc direction with the arm member. Recording / playback device. 3. The mode operating mechanism includes a brake arm member to which a reel brake member is attached, and the brake arm member is configured to be operated by a cam portion provided on the outer periphery of the control member. The magnetic recording / reproducing apparatus according to claim 1, which is characterized. 4. The magnetic recording / reproducing apparatus according to claim 1, wherein the tape guide driving member is driven by the control member.