JPS6053379B2 - Positioning device for magnetic recording and reproducing devices - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a magnetic recording and reproducing device that uses a tape loading mechanism to pull out a magnetic tape from a cassette and wrap it around a rotating head drum at a predetermined angle to record and reproduce signals on the magnetic tape. The present invention relates to a positioning device that determines a pole base at a predetermined position for pulling out a tape from a cassette and winding it around a rotating head drum.

As this type of device, a configuration as shown in FIG. 1, for example, has been proposed. A cassette 1 is mounted at a predetermined position in a magnetic recording/reproducing device, and pole bases 3 and 4 are connected to a magnetic tape 2 wound between a supply reel 10 and a take-up reel 11. is in the position shown by the solid line in FIG. 1 before loading, and the vertical guide poles and inclined poles set on the pole bases 3 and 4 are located on the opposite side of the rotary head drum 5 with respect to the magnetic tape 2. are doing.

When the pole bases 3 and 4 are moved close to the circumference of the rotary head drum 5 along the pair of guide holes 37 of the guide plate 14 by the loading operation, the magnetic tape 2 is pulled out by the guide pole and the inclined pole. Further, the pole bases 3, 4 are carried around the rotating head drum 5, and the guide pole portions of the pole bases 3, 4 are also pressed against the V grooves of the holders 8, 9 and positioned, as shown by the dotted lines in FIG. When the loading completion position is reached, the magnetic tape 2 is wound around the rotary head drum 5 at a predetermined angle by the upper part of the guide ball 35 and the inclined ball.

When this loading is completed, the magnetic tape comes out of the supply reel 10, comes into contact with the erasing head 6, and rotates via the upper part of the guide ball 35 of the ball base 3 and the inclined ball, as shown by the dotted line in FIG. It wraps around the head drum 5, contacts the audio and control head 7 via the inclined ball and guide ball of the ball base 4, is pulled between the pinch roller 12 and the capstan 13, and is wound onto the take-up reel 11. .

In such a magnetic tape running path, it is necessary to guide the magnetic tape 2 so that it comes into correct contact with the rotating head drum 5 on which the rotating magnetic head is mounted, and the position of the ball base is especially important, as it is necessary to repeatedly load the magnetic tape 2. It is necessary to always position it at a constant position even when performing the operation. An object of the present invention is to provide a positioning device that can further ensure the positioning of such a ball base.

According to the above proposed example, the guide balls 35 planted on the ball bases 3, 4 are pressed into the V grooves of the pedestals 8, 9, so that the ball bases 3, 4 are positioned. It's just that.

However, according to the positioning of the ball bases 3 and 4 using the guide ball 35 and the pedestals 8 and 9, the rotation direction of the ball bases 3 and 4 relative to the guide ball 35 is limited. This means that sufficient positioning cannot be achieved. Therefore, the present invention is characterized by improving the positioning in the rotational direction as described above, and one embodiment will be described below. Therefore, in this embodiment, the guide ball receiving stands 8, 9 are moved from the position before the ball bases 3, 4 are fixed.
The mechanism is roughly divided into a mechanism for pressing the guide ball into the V-groove, and a mechanism for positioning the guide ball in the rotational direction in this pressed state, and the former will be explained first.

On the ball bases 3 and 4, guide balls 35 are installed upwardly and downwardly, inclined oblique balls are installed upwardly, and guide pins 34 are installed downwardly. The lower part is the sliding plate 19
A plate spring 38 that passes through the central through hole and engages with the guiding groove 37 of the guide plate 14 and is provided at the lower part of the guide ball 35 is in elastic contact with the lower surface of the guide plate 14, and the ball bases 3, 4 can move along the groove 37.

A pressing pin 33 is installed upward and a connecting pin 39 is installed downward on the sliding plates 19 and 20.
, 20 are engaged with the elongated holes of the double-acting levers 24 and 25, respectively, and as the double-acting lever 24 rotates clockwise, the sliding plate 19 rotates in the same direction and counterclockwise as the double-acting lever 24 rotates counterclockwise. As the direction rotates, the sliding plates 19 move in the same direction and can press the ball base 3 via the pressing pin 33, thereby making it possible to move it.

Regarding the counterclockwise rotation of the double-acting lever 24,
When the guide pin 34 passing through the double-acting lever 24 is pushed through the edge of the through hole, the ball base 3 can move in the same direction, and conversely, when the double-acting lever 25 rotates clockwise, the ball base 3 moves in the same direction. 4 can move in the same direction. This double-acting lever 24 is superimposed on the ring 21 so as to be movable within a predetermined range in the circumferential direction thereof, and a tension spring 30 is suspended between the ring 21 and the inner circumferential side of the ring 21. As shown in FIG. 2, it is supported by rollers 23 that are rotatably provided on shafts that are set upward at three points spaced apart from each other.

Furthermore, this ring 21 is meshed with a gear 27 to which the rotational force of a reversible motor 29 is transmitted via a power transmission means 28 so that the ring 21 is rotated clockwise or in the opposite direction. Before the loading operation, the double-acting lever 24 is in the second
As shown by the broken line in the figure, the ball base 3 is also in the initial position, which corresponds to the solid line in FIG. The lever 24 moves clockwise, and as a result, the sliding plate 19 with the connecting pin 29 engaged with the elongated hole of the double-acting lever 24 and the pressing pin 33 of the sliding plate 19
The ball bases 3 pressed together move clockwise,
The magnetic tape is pulled out from the magnetic tape set 1 by the upper part of the inclined ball and guide ball 35 set on the ball base 3.

Here, as shown in FIG. 4, it is possible to use a guide part 36 which can be attached and detached by screwing the upper part of the guide ball 35. Due to such rotation, the guide ball 35 of the ball base 3 comes into contact with the grooves 8a and 8b of the pedestal 8 provided on the guide plate 14, and the ball base 3 cannot move any further, but the double-acting lever 24 and ring 2
The ring 21 rotates a little further against the elastic force of the spring 30 suspended between the ring 21 and the ring 21, and is stopped and held at an appropriate position.

As a result, the elastic force of the spring 30 is applied to the double-acting lever 24.
, the guide ball 35 acts on the ball base 3 via the connecting pin 39, the sliding plate 19, and the pressing pin 33, and the guide ball 35 moves into the grooves 8a, 8.
b is crimped. In such a loading completed state, the position of the ball base 3 corresponds to the solid line in FIG. 3, and the position of the double action lever 24 corresponds to the solid line in FIG. 2 and the dotted line in FIG. 1. Here, the pedestal 8 consists of an upper part forming a groove 8b at a position above the guide plate 14, and a lower part forming a groove 8b at a position below the guide plate 14, and especially when the loading is completed, the ball base 8 It is desirable to provide a means for vertical positioning of the guide ball 35. When the guide ball 35 is in contact with the V-grooves 8a and 8b, the lower end surface of the guide ball 35 rides on the lower plane of the pedestal 8, causing the vertical positioning. The location is being determined.

That is, as shown in FIG. 4, a flat surface 8c is formed in the lower part of the pedestal 8, which is connected to an inclined surface on which the lower end surface of the guide ball 35 can ride. As a result, it is desirable to provide a means for positioning the guide, and as shown in FIG. 4, a flat surface 8c is formed in the lower part of the guide ball 35 to connect to an inclined surface on which the lower end surface of the guide ball 35 can ride.
As the ball base 3 moves, the guide ball 35 reaches the inclined surface, resists the elastic force of the leaf spring 38, rides on it, and eventually completely rides on the flat surface 8c, and then slides into the grooves 8a and 8b. The state shown in FIG. 4 is reached. At this time, the ball base 3 rises to the extent that the guide ball 35 rises to ride on it, a gap is created between it and the sliding return 19, and the guide ball 35 is pressed against the flat surface 8c by the elastic force of the leaf spring 38. As a result, the guide ball 35 and hence the ball base 3 are positioned in the vertical direction. Note that although the mechanism for positioning the ball base 3 on the cradle 8 has been described above, the mechanism for positioning the ball base 4 on the cradle 9 is also configured so that the moving direction of the ball base 4 is reversed. It can be configured similarly.

That is, the ring 22 rotated by the gear 26 meshing with the gear 27 (the ring 21 is attached to the shaft on which the ring 21 is supported).
It is similarly supported below. ) The connecting pin 39 of the sliding plate 20 is engaged with the elongated hole of the double-acting lever 25, which is superimposed on the double-acting lever 25 via the spring 31. In this way, when the motor 29 rotates, the ring 22 rotates in the opposite direction with respect to the ring 21, and in turn, the ball base 4 rotates in the opposite direction with respect to the ball base 3. When the loading is completed, the ball bases 3 and 4 are rotated in the opposite direction. Positioning is performed by pressing on the pedestals 8 and 9. The present invention is characterized by positioning that is useful for regulating the rotation of the ball bases 3, 4 around the cradle 8, 9. A preferred embodiment in which positioning by pressing 9 is also realized will be described below.

The sliding plates 19 and 20 each have a lock pin 32 erected upward at the end opposite to the connecting pin 39, that is, at the front end that becomes the front part during the loading operation.

The lock levers 15 and 16 for locking the lock pin 32 in the loading completion state are attached to the guide plate 1.
The lock levers 15 and 16 are provided with hook-shaped portions 15a and 16a for engaging the lock pin 32 in a locked state. Lock part 15a between lock levers 15 and 16
, 16a are suspended using a tension spring in order to bias the lock pin 32 in a direction to firmly lock the lock pin 32.

As a result, in order for the lock levers 15 and 16 to enter or release the locked state with the lock pin 32, the lock portions 15A and 16a of the lock levers 15 and 16 are released from the transition stroke of the lock pin 32. It is necessary to temporarily resist the force of the spring 18 and allow it to escape.

The lock portions 15a, 1 of the lock levers 15, 16
6a opposite end 15b to the shafts 15'', 16'';
A drive lever 17 having a drive pin 17a which can be pressed and moved in common with 16b against the biasing force of a spring 18 is rotatably supported in the center by a shaft 17'' on the main chassis, and the other end of the lever 17 The roller 17b faces the ring 22, and the cam surface 22a of the ring is here formed as a protruding shape.

This cam surface 22a is designed to move the drive lever 17 to the locking portions 15a, 16a when the locking portions 15a, 16a are introduced into the locked state with respect to the lock pin 32 or released from the locked state during a loading operation or a releasing operation thereof. is formed at an appropriate position to allow the lock pin 32 to temporarily retreat from the movement path, and when the roller 17b is in contact with the surface 22a1 concentric with the ring 22, the drive lever 17 is at the position shown by the solid line in FIG. 2, and the locking portions 15a, 16a are retracted from the movement path of the locking pins 32, 32 by a necessary amount.

Note that the cam surface 22a has inclined surfaces 22 on both sides of the surface 22a1.
2, 22a3, which helps in smooth movement of the drive lever 17. Now, before the loading operation, double-acting lever 2
4, 25, and the drive lever 17 are respectively located at the positions indicated by the broken lines in FIG.
It is located at a position corresponding to the solid line in Fig. 3 according to the auxiliary force of 8.

When the ring 21 rotates clockwise and the ring 22 rotates counterclockwise in accordance with the predetermined rotation of the motor 29 due to the loading operation, the ball base 3 rotates clockwise. ball base 4 towards
move counterclockwise, and eventually the roller 17b starts contacting the inclined surface 22a2, and then the drive lever 17
receives a force from the inclined surface 22a2 via the roller 17b and starts rotating counterclockwise, and the drive lever 17
Mouth with a. Connect the levers 15 and 16 to their ends 15b and 16.
b to rotate the locking portions 15a and 16b in a direction in which they are retracted from the movement path of the locking pin 32 against the biasing force of the spring 18.

When the roller 17b eventually rides on the surface 22a1 of the cam surface 22a, as shown by the broken line in FIG.
, 16a are retracted from the transfer path of the lock pin 32 by the amount necessary to not obstruct movement, and this state continues. Also, the lower part of the guide ball 35 of the ball base 3 is a cradle 8.
The guide ball 35 will eventually reach the V-groove 8a of the cradle 8.
, 8b and the plane 8c (Fig. 4),
Of course, at the same time, the lower part of the guide ball 35 of the ball base 4 comes into contact with the pedestal 9, resulting in a state similar to that shown in FIG. 4. In this way, the ball bases 3 and 4 are connected to the guide ball 3.
The lock pins 32, 32 are locked in the lock portions 15a of the lock levers 15, 16 until they come into contact with the cradle 8, 9.
, 16a.

Thereafter, the ring 21 further rotates clockwise against the elastic force of the spring 30, and the ring 22 further rotates clockwise against the elastic force of the spring 31. When the drive lever 17 reaches the surface 22a3 and can rotate clockwise, the elastic force of the spring 18 urges the lock levers 15 and 16 to lock the lock portions 15a and 16a with the lock pins 32 and 32. Since the lock lever 15 is given a rotational force in the counterclockwise direction and the lock lever 16 is given a rotational force in the clockwise direction, the drive pin 17a is pushed outward by the ends 15a and 16b, and the drive lever 17 is pushed in the clockwise direction. As a result of receiving the rotational force, the drive lever 17 rotates clockwise and starts moving along the inclined surface 22a3, and at the same time, the lock lever 15 moves counterclockwise and the lock lever 16 moves clockwise, that is, the lock pins 32, 32 Start rotating in the direction of locking.

Finally, when the rings 21 and 22 move sufficiently against the springs 30 and 31 to complete loading, the lock levers 15 and 16 move to the lock portions 15a and 16a7.
It engages with the five hook pins 32, 32 to be in a locked state as shown in FIG.

In this locked state, the force acting on the lock pins 32, 32 via the lock portions 15a, 16a due to the elastic force of the spring 18 is approximately equal to the force applied to the shafts 15'' of the lock levers 15, 16,
The sliding plates 19 and 20, which are subjected to such a force by the lock pin 32, include a component that pulls in the direction of 16'' and a component that pulls in the direction of the inner circumference of the groove 37. A guide pin 34,3 passing through the hole edge through it.
4 is pressed against the inner circumferential side of the grooves 37, 37, and the lower part of the ball bases 3, 4 and, in turn, the guide pole 35 are pressed against the receivers 8, 9 via the pressing pin 33, and the ball bases 3, 4 are pressed against the holders 8, 9. Since the center of rotation is determined by the guide balls 35, 35, the ball bases 3, 4 rotate around the guide balls 35, 35 and the guide pins 34, 3.
4 is pressed toward the inner circumferential side of the grooves 37, 37, positioning in the rotational direction is performed.

The force received by the lock pins 32, 32 at the contact surface with the lock portions 15a, 16a is approximately from the contact surface to the shafts 15'', 1
6'', which is transmitted through the pressing pins 33, 33 of the sliding plates 19, 20 to the ball bases 3, 4 and the guide balls 35, 35 to the grooves 8a, 8 of the receiving stands 8, 9.
Shafts 15'' and 16'' are provided on the guide plate 14 to serve as a force for pressing against the guide plate 14, and to make this force sufficiently large. For example, the shafts 15'', 16'' are located on or near a tangentially extending line in the grooves 37, 37 facing the pin 32 in the locked state. In short, the lock portions 15a and 16a for the pin 32
The contact surfaces of the guide balls 35, 35 are shaped and positioned in such a way that the pressing force of the guide balls 35, 35 against the pedestals 8, 9 and the pressing force of the guide pins 34, 35 against the inner periphery of the groove 37 are both appropriately obtained. be done.

Next, when the motor 29 is rotated in the opposite direction to the loading operation, the rings 21 and 22 rotate in the opposite direction to the loading operation, and finally the double acting levers 24 and 25 and the drive lever 17 are moved to the position indicated by the broken line in FIG. In addition, ball base 3,4
return to the positions corresponding to the solid lines in FIG. 1, returning to the state before the loading operation.

According to the positioning device for a magnetic recording/reproducing device of the present invention, the positioning in the rotational direction around the guide ball is realized by the contact between the guide ball of the ball base and the cradle as described above. A more reliable positioning effect can be obtained than in the proposed case of merely positioning the ball base in the advancing and retreating direction by the above-mentioned contact.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a proposed example of a positioning device for a magnetic recording/reproducing device, FIG. 2 is a block diagram of main parts of an embodiment of the present invention, and FIG. The plan view at the time of completion of loading to explain the configuration of the example is shown in the fourth section.
Each of the figures shows a cross-sectional view of the ball base portion taken along the line A-N when loading is completed.

1: Cassette, 3, 4: Pole base, 8, 9: Rest, 15, 16: Lock lever, 17: Drive lever, 19
, 20: Sliding plate, 21, 22: Ring, 24, 25: Double acting lever, 29: Motor, 32: Lock pin, 34:
guide pin.

Claims (1)

[Claims] 1. A pair of guide holes located on both sides of the rotary head drum and extending in the direction of the cassette device position from the vicinity of the rotary head drum are provided in a guide plate on which a cylindrical rotary head drum with a built-in rotary head is mounted. a pole base having a pole for pulling out the tape is slidably engaged with the guide hole, and a pair of rings that are engaged with the pole base and each have a rotation center are rotated in opposite directions. When the ring is rotated, the pole pulls out the tape from the cassette and brings it into contact with the circumferential surface of the rotary head drum, and the guide pole portion of the pole base is moved to a cradle at the loading completion position. In a magnetic recording and reproducing device having a mechanism for positioning the pole base by pressing the pole base, a lock pin provided on the pole base;
a pair of lock levers that are locked to the lock pins in a state where they are pressed against a receiving part for positioning in the rotational direction around the rotary head drum at the loading position; and the lock when the locking state is introduced into or released from the locked state. 1. A positioning device for a magnetic recording/reproducing device, comprising: a cam surface provided on at least one of the rings for retracting the lever to a position where the lever can be temporarily retracted.