JPH07109680B2 - Magnetic recording / reproducing device's tape-reading mechanism - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a tape loading mechanism of a magnetic recording / reproducing apparatus of a VTR etc. rotating head type cassette type, and more particularly to a small and thin type such as a camera integrated VTR. The present invention relates to a tape loading mechanism of a magnetic recording / reproducing apparatus which is suitable for use.

[Conventional technology]

The loading mechanism is the main cause that governs the size of the mechanism of the magnetic recording / reproducing apparatus. In recent years, this loading mechanism has become a mainstream with a ring because a wide-angle winding is required as a 4-head small-diameter drum system corresponding to VTR-integrated cameras such as VHS-C cassettes. That is, a ring is arranged substantially concentrically around a tape guide drum having a built-in rotating head, and a tape guide group is connected to the ring to rotate and rotate the ring (tape guide driving member) to perform tape loading / unloading. It is a thing. Such a ring system can more easily handle wide-angle winding around the drum than the conventional arm system, and can reduce the number of parts without requiring a complicated articulated arm. A device related to this type of device is, for example, JP-A-60-18848.

[Problems to be solved by the invention]

The above-mentioned prior art aims to reduce the inclination angle of the tape guide drum corresponding to wide-angle winding, but devising a loading mechanism and mechanism for making the device thinner and downsized. That is not considered at all.
That is, in the above-mentioned prior art, as shown in FIG. 8 of the above publication, since the ring is located further below the tape guide group at the loading completion position, the height of the loading mechanism is high and the total height of the mechanism is high. There was a big problem.

In addition to such a conventional technique, a method has also been proposed and put to practical use, in which a ring is arranged on the outside along the movement path of the tape guide group and the tape guide group and the ring at the loading position are arranged in a plane without overlapping. . However, in this method, although the mechanism can be made thin, the plane area becomes large, and as a result, it becomes a factor that hinders the miniaturization of the mechanism.

The object of the present invention is to eliminate the above-mentioned disadvantages of the prior art,
An object of the present invention is to provide a loading mechanism capable of simultaneously achieving reduction in flat area and thinning.

[Means for solving problems]

In order to achieve the above object, the tape loading mechanism of the magnetic recording / reproducing apparatus of the present invention forms a tape guide driving member for driving a tape guide group for loading in an arc shape, and drives the tape guide group from the cassette to a magnetic field. A first (for example, the entrance side) tape guide group for pulling out the tape horizontally and positioning and holding it by the tape guide positioning mechanism, and a second tape guide group for tilting and pulling out the magnetic tape from the cassette and holding it by the tape guide positioning mechanism. (For example, on the outgoing side)
A tape guide group, and the tape guide driving member is arranged at an intermediate height position between the first tape guide group and the second tape guide group, whereby the tape guide driving member is rotated. The surface is located at the middle height of both tape guide groups.

In a preferred embodiment, the moving paths of the first and second tape guide groups are arranged so as to extend along the outer circumference of the tape guide driving member having an arc shape (ring shape) substantially in accordance with the radius of rotation thereof.

The tape guide positioning mechanism holds the tape guide group up and down and has a notch at an intermediate height position so as not to hinder the rotation of the tape guide driving member. The tape guide drive member drives a first (entrance side) tape guide drive member that drives the first (entrance side) tape guide group, and a second (outgoing side) tape guide group. It is composed of a second (outgoing side) tape guide drive member, and the first and second tape guide drive members are rotated by an arcuate cam member that controls a tape drive mechanism such as a reel brake or a pinch roller. Power is given. The first and second tape guide driving members and the cam member are concentrically arranged and vertically overlapped (with the same radius).

[Action]

As described above, the arc-shaped tape guide driving member is arranged at the intermediate height position between the first and second tape guide groups,
Since it rotates in the plane of that height, the height of the entire device can be made extremely thin. Since the moving paths of the first and second tape guide groups substantially match the radius of rotation of the tape guide driving member on the rotation surface thereof and substantially follow the outer circumference of rotation, there is little planar expansion and the size is reduced. It

At least one tape guide group is held by positioning the magnetic tape obliquely from the cassette and positioning it by a positioning mechanism. At this time, the other end of the drive member for driving the tape guide group, which is not connected to the tape guide group, is in a positional relationship where it does not interfere with the positioned tape guide group, and the drive member is a tape which is pulled out horizontally from the cassette. They are at different heights that do not interfere with the guide groups. Therefore, the drive member can be arranged at substantially the same plane position as the moving path of the tape guide group and at the same height as the tape guide group pulled out obliquely.

〔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. When the cassette 3 is mounted on the device, the lid 12 on the front of the cassette 3 opens. Further, a tension pin 16, a guide roller 17 and an inclined pin 18 are inserted in the opening 13, and a guide roller 19 is inserted in the opening 14.
And the tilt pin 20 is inserted, and the tilt pin 21 is inserted in the opening 15.
And the capstan 7 are inserted at the positions shown by the broken line and the solid line, 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 together form a first guide roller group, which moves horizontally as a pair and is positioned near the tape guide drum 2. Guide roller 19 and tilt pin 20 are second together
The guide roller group is formed as a pair, and is horizontally positioned up to the vicinity of the audio control head 11, and thereafter is moved obliquely downward to be positioned near the tape guide drum 2, and the tape is attached to the tape guide drum 2. 6 almost 270 °
Wind up. 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, the tension pin 16, the height regulation guide 22, the erasing head 10, the guide roller.
The tape guide drum 2 is spirally wound around the tape guide drum 2 at a predetermined angle through a tilt pin 17, a tilt pin 18, a guide roller 19, a tilt pin 20, a tilt pin 21, a fixed guide 23, and an audio control head.
11. After passing through the height regulation guide 24 and the fixed guide 25, the capstan 7 and the pinch roller 8 are pressed into contact and driven, and reach the take-up reel 5. FIG. 3 is a side view after completion of loading, and FIG. 4 is a side view after completion of unloading.
In FIG. 3, reference numeral 26 is a guide base, on which the guide roller 17 and the inclined pin 18 are planted, and which is positioned and held by a cache 28, and 27 is also a guide base and the guide roller 19 is provided.
And the tilt guide 20 is planted and similarly positioned by the cache 28. 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. As a result, the tape guide drum 2
The tape guide drum 2 can be arranged under the front lid 12 that opens to the front of the cassette 3 when the cassette is attached by reducing the inclination angle of the cassette 3 and by arranging the tape guide drum 2 at a position slightly lower than the cassette 3. We are trying to make it thinner.

Next, the loading mechanism will be described in detail. FIG. 5 shows the guide moving member on the exit side. Guide roller 19 and inclined pin
The guide base 27 for planting the 20 is rotatably supported in the plane by a connecting plate 29 as shown by an arrow in the figure, and the connecting plate 29 is also rotatable in the plane like another arrow. It is supported 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 indicated by another arrow. The output side drive member 31 has an arc shape, and a gear portion 31a is provided on the outer periphery thereof. FIG. 6 shows the guide moving member on the entrance side. Guide roller 17 and tilt pin 18
The guide base 26 for erection is supported by a connecting plate 32 so as to be rotatable in a plane as indicated by an arrow, and the connecting plate 32 is provided in a U-shaped portion 33b provided at one end of the entry side driving member 33. It is rotatably supported like another arrow. Since the outlet drive member 31 moves inside the U-shaped portion 33b, that is, above the inlet drive member 33 and below the connecting plate 32, both drive members or the drive member and the guide group are in the middle of the movement. There is no collision. The movement route of the guide group will be described with reference to FIG. 12 described later. The entrance-side drive member also has an arc shape, and a gear portion 33a is provided on the outer periphery thereof. Figure 7 shows cam 3
Shows 4. The cam 34 consists of two upper and lower stages, the upper part has a gear part 34a and a cam part 34d from the left side, the lower part has a stopper surface 34b corresponding to a Geneva gear (described later), and a cam part corresponding to a mode operation after loading. 34c, a cam portion 34f corresponding to the middle of loading / unloading, and a cam portion 34e corresponding to the mode operation after the loading, and have an arc shape as a whole. These are arranged concentrically on the shiyashi in the order of the output drive member 31, the input drive member 33, and the cam 34 from the top.

FIG. 8 shows the upper stage of the cam 34 and the drive system. (A) shows the unloading state, (b) shows the loading / unloading process, and (c) shows the loading state. In the cam 34, a gear 35 driven by a drive source (not shown) has a gear portion 34a.
It is driven by engaging with. As the cam 34 rotates, the gear 36 that meshes with the gear portion 34a rotates, and the delivery-side drive member 31 rotates integrally with the gear 38 via the gears 37 and 38 via a compression spring (not shown). The gear 39 is driven by being engaged with the gear portion 31a. Similarly, the entry side drive member 33
Is driven by engaging a gear 41a (see FIG. 10 to be described later) having a built-in crimping spring (not shown) via gears 40 and 41 with a gear portion 33a. When the loading is completed (c), the rotation of the gear 36 is stopped by the Geneva gear described later, and the engagement between the gear 36 and the gear portion 34 is released. On the other hand, in the state of (b) during loading, the cam
The arm 42 is engaged with the tip end of 34, and the arm 42 rotates about the fixed shaft 43, and the arm 44 rotates counterclockwise about the shaft 45. The arm 44 is engaged with the pinch roller mounting shaft 49 of the arm 48 by the arm 46 via the shaft 47.
Since 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, and the pinch roller 8 pivotally supported by the arm 48 is loaded. Move to position. Since the arm 48 is biased in the direction of arrow A by a spring (not shown), the pinch roller 8 is retracted to the unloading position when the cam 34 and the arm 42 are not engaged (a). When the cam 34 further rotates from the state shown in (b) to the state shown in (c), the arm
42 engages with the cam portion 34d and presses the pinch roller 8 against the capstan 7 by a toggle mechanism formed by the arms 44 and 46. The shaft 45 is erected on an arm 51 which is rotatably supported around a fixed shaft 52, and the arm 51 is always pulled in a counterclockwise direction by a spring 53 and its position is regulated by a stopper 54. Even after the movement is stopped, the arm 42 is rotated and the arm 51 moves away from the stopper 54 against the spring 53, so that the crimping force between the pinch roller and the capstan is secured.

As described above, the entrance side drive member 33, the exit side drive member 31, and the cam 34 are rotatably supported by a common member, respectively, and are of a system of moving on the same radius of rotation, so that the parts are effectively The score can be reduced. It should be noted that each drive member and the cam can be supported by different support members.

FIG. 9 shows the lower stage of the cam 34 and the mode operation mechanism, (a).
Shows loading, (b) shows loading / unloading, and (c) shows loading. 36
Reference character a is a Geneva gear unit provided integrally with the gear 36. One end of the arm 55 is engaged with the cam portion 34c or 34e, and is biased counterclockwise 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 to apply a braking force to the supply reel base 59. Arm 60
Is a spring attached to one end that engages the cam portion 34c or 34e
61 is urged clockwise about the shaft 62. 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 and is biased counterclockwise around the shaft 62. 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 the stopped state after unloading,
The arm 55 engages with the concave portion of the cam portion 34e, and a braking force is applied to the supply reel base 59. At this time, since the concave portion and the arm 55 do not directly engage with each other, the braking force is determined only by the force of the spring 57 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 the spring 61
The shaft 60a and the arm 63a are disengaged from each other,
The braking force is applied to the drive disc 66 only by the urging force of the cam disc 34, and the braking force can be stably ensured 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 of (a) is changed to the state of (b), the arm (60) moves to the cam groove 34e.
Then, the brake 64 once comes down into the concave portion of the vehicle and the brake 64 comes off. This mode is FF / REW mode and at the same time arm 55
Since it is riding on the convex part, the brake 58 is also off. 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, the axis loss of the take-up reel stand is at a certain level, the loading operation is performed immediately, and the tape guide group moves forward. , Has not reached a big problem. The state of (c) shows a recording / reproducing state, and a 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 rotated by the pulling force of the spring 61, and the shaft is rotated. 60a engages with the arm 63a to rotate the arm 63 against the spring 65, and releases the braking force to the drive disk 66. At this time, the Geneva gear part of Gear 36
By engaging 36a with the stopper surface 34b, the driving force from the gear 35 is cut by the gear 36, the rotation after the gear 36 is stopped, the driving members 31 and 33 are stopped, and the positioning member of each tape guide group is stopped. The crimping force to is maintained. The crimping force at this time is obtained by the above-mentioned crimping spring incorporated between the gear 38 and the gear 39 and the crimping spring incorporated 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. 10 shows the above-mentioned three driving members 31 and 33 and the cam 34.
Shows the movement of (a) at the time of eject, (e) at the completion of loading, and (f) at the time of mode operation such as recording / playback. The shape of each member is simplified and shown in an arc shape. 67 is a support roller that supports each member, and 67b and 67c that contact the drive members 31 and 33 and the cam 34 from the inner circumference.
Is a cylindrical roller, and 67a and 67d are in contact with each other from the outer circumference.
Is gear. 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 degree, and the exit side drive member 31 rotates in the same direction at almost double speed. By arranging the drive member and the cam concentrically and supporting them by the coaxial rollers, the number of parts can be reduced.

FIG. 11 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 lower part of the guide roller 17 is positioned by the V groove 28a and the upper part is regulated by the U groove 28b to prevent the guide roller 17 from falling in a direction perpendicular to the entering direction. . The height of the guide roller 17 is restricted by the upper end of the guide base 27 contacting 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 of the guide roller 19 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 inclination pin 20 is restricted by the wall 28h. Further, a cutout portion 28i is provided between the V groove 28e and the U groove 28f of the carrier 28. FIG. 1 is a side view of the apparatus with a part of the cache 28 in section, (a) showing an unloaded state,
(B) shows the loading completed state. In the unloading state, one end of the cam 34 and one end of the exit side driving member 31 penetrate the cutout portion 28i, but since these members escape from the cutout portion 28i by the loading operation, in the loading completion state. Guide roller 19
Also, the tilt pin 20 can be held in place.
In this way, the notch portion is located at the position where the tape guide group is moved diagonally during loading, and the exit side and the entry side drive member are inserted into that location during unloading, thus making it compact.

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 integrated structure having a guide part of the entrance tape guide group and a guide part of the exit tape guide group, and the tip of the guide part of the exit tape guide group descends along the tape running path. It has a descending part. The tip 68a of the cross section of the guide member 68 is the guide base 26 or 2
It engages so as to be gripped in 7, and regulates the movement path of the guide base 26 or 27.

In this way, the output side guide groups 19, 20 and the input side guide groups 17, 18
The movement path of the driving members 31 and 3 is determined by the guide member 68.
It does not necessarily match the radius of gyration of 3. 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 output side drive member 31 and the support roller 67d engage at a substantially intermediate position between (c) and (d) shown in FIG. Support roller 6
The gear part of 7d is engaged with 69 and is a gear integrated with the gear 69.
After the speed is reduced to about 1/2 at 70, the gear 73 is rotationally driven via the gears 71 and 72. The gear 73 is coaxially engaged with the arm 74 via a pressure spring (not shown), and moves the tilt pin 21 implanted at the tip of the arm 74 to a predetermined position defined by the cache 75. Crimp. By driving the tilting pin 21 at the above-mentioned timing, the tilting pin 21 is loaded following the rear of the guide base 27. 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 over the overlapped portion, the exit side driving member 31 and the support roller 67d engage with each other to form the inclined pin. Support roller 6 to drive 21
The position of 7d and the reduction ratio of the arm 74 drive system are set. Therefore, since the movement of the arm 74 is controlled by the movement of the output side drive member 31, there is no interference in the overlap portion. Further, since the single support roller 67d supports the output side driving member 31 and transmits the driving force, the number of parts can be reduced.

〔The invention's effect〕

As described in detail above, in the tape loading mechanism of the magnetic recording / reproducing apparatus of the present invention, the tape guide drive mechanism has the first tape guide group in which the tape is horizontally pulled out from the cassette and positioned, and the tape is inclined from the cassette. The height of the entire magnetic recording / reproducing apparatus is thin because it is arranged at an intermediate height from the second tape guide group which is pulled out and positioned, and is rotated at the surface of that height. be able to. In addition, since the movement path of the tape guide group is almost along the rotation surface of the tape guide drive member and substantially along the rotation radius (because it is the path that matches the rotation radius or is along the outer circumference), the flat area However, it does not spread so much, and both height and size can be reduced, and the size and weight can be reduced. In particular, since the second tape guide group has an inclined movement path, the movement path and the tape guide driving member can be arranged so as to vertically overlap with each other with the same radius (overlap), so that the plane area can be further increased. It can be downsized and miniaturized.

[Brief description of drawings]

FIGS. 1 (a) and 1 (b) are side views of an embodiment of a tape loading mechanism of a magnetic recording / reproducing apparatus of the present invention at the time of unloading and completion of loading of an output side loading mechanism, and FIG. 2 is a side view of the present invention. A plan view of a magnetic recording / reproducing apparatus to be applied, FIGS. 3 and 4 are side views of FIG. 2 at the completion of loading and unloading, and FIG. 5 is a perspective view of an output tape guide driving member and a tape guide group. 6 and 6 are perspective views of the entrance side tape guide drive member and the tape guide group, FIG. 7 is a plan view of the mode operation unit by the cam member, and FIGS. 8 (a), (b), and (c) are FIGS. 9 (a) and 9 (b) are plan views showing the state of the cam member during unloading, during the loading operation, and when loading is completed.
(C) is a plan view showing the state of the mode operation section by the cam member during unloading, in the middle of loading, and at the completion of loading, FIG. 10 is a timing chart of the operation of the tape guide drive member and the cam member, and FIG. 11 is FIG. 12 is a perspective view of the tape guide guide member, FIG. 13 is a side view of the tape guide guide member, and FIG. 14 is a plan view of the output side inclined pin drive mechanism. Is. 1 ... Sheath, 2 ... Tape guide drum, 3 ... Cassette, 4 ... Supply reel, 5 ... Take-up reel, 6 ... Tape, 7 ... Capstan, 8 ... Pinch roller, 17, 19
...... Guide rollers, 18,20,21 …… Inclined pins, 26,27 ……
Guide base, 28 ... Catcher (tape guide positioning mechanism), 31 ... Ejection side (second) tape guide drive member, 33 ... Inlet side (first) tape guide drive member, 34 ...
… Cam member, 36 …… Gear (driving source), 37,38,39,40,41,4
1a …… Gear mechanism, 42 …… Pinch roller operating arm, 55,6
0 …… Reel brake operating arm, 67 …… Support roller, 6
8 …… A guide member for the tape guide.

Claims (5)

[Claims] 1. A tape guide drum having a rotating magnetic head, a tape guide group for drawing a magnetic tape from a cassette and winding the magnetic tape around the tape guide drum to form a tape running path, and a tape guide drum substantially concentric with the tape guide drum. And a tape guide driving member that is arranged in a circular shape to reciprocate the tape guide group between an unloading position and a loading position, and the tape guide group is positioned so as to form a running path of the tape at the loading position. In a tape loading mechanism of a magnetic recording / reproducing apparatus having a tape guide positioning mechanism that holds the magnetic tape, the tape guide group pulls out the magnetic tape substantially horizontally from the cassette and positions and holds the magnetic tape by the tape guide positioning mechanism. Inclining the magnetic tape from the first tape guide group and cassette And a second tape guide group that is pulled out and positioned and held by the positioning mechanism, wherein the tape guide drive member rotates around the tape guide drum to drive the tape guide group. It is formed in an arc shape, the tape guide group is connected to one end thereof, and the intermediate height position between the first tape guide group and the second tape guide group held by the positioning mechanism. Of the tape guide driving member, so that the surface of the tape guide driving member that rotates around the guide drum is at an intermediate position between the first and second tape guide groups. Loading mechanism. 2. The tape guide positioning mechanism comprises a holding portion for positioning and holding the first tape guide group and the second tape guide group at their upper and lower ends, respectively, and a holding section at the highest level in the height direction. And a cutout portion formed at an intermediate height position of the lowest holding portion so that the tape guide drive member can freely rotate at the intermediate height position. A tape loading mechanism of the magnetic recording / reproducing apparatus according to claim 1. 3. At the loading position, the first guide roller group is arranged on the entrance side of the guide drum, and the second guide roller group is arranged on the exit side of the guide drum. The tape loading mechanism of the magnetic recording / reproducing apparatus according to claim 1. 4. The tape guide drive member includes a first tape guide drive member that drives the first tape guide group and a second tape guide drive member that drives the second tape guide group. 2. The tape loading mechanism of the magnetic recording / reproducing apparatus according to claim 1, wherein the first and second tape guide drive members are vertically stacked at the intermediate height position. 5. An inclined pin for guiding a tape, which is located between the second tape guide group and the tape winding mechanism separately from the second tape guide group on the output side at the loading position, and the second tape guide group. An inclined pin drive mechanism controlled by a tape guide drive member to reciprocally drive the inclined pin between an unloading position and a loading position, wherein the second tape guide group serves as the second tape guide drive member. It is attached via a rotatable guide base, and when loading, the second tape guide drive member causes the inclined pin to partly follow the same trajectory at the timing of following the guide base. The tape loading mechanism of the magnetic recording / reproducing apparatus according to claim 4.