JPH0142177Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a switching operation mechanism for a tape recorder.

BACKGROUND TECHNOLOGY AND PROBLEMS Conventionally, for example, in a switch device that presses a push button and slides an operating lever to perform a switching operation, two tension coil springs are biased in opposite directions between the operating lever and a board. When the operating lever slides in one direction, one tension coil spring expands, and when the operating lever slides in the other direction, the other tension coil spring extends and returns the operating lever. However, it is difficult to balance the biasing force of both tension coil springs against the operating lever, and there are difficulties in adjusting the neutral holding of the operating lever, and when the operating lever slides, both tension coil springs simultaneously This may cause the inconvenience that operations may not be performed smoothly.

Purpose of the invention In view of the above-mentioned points, the present invention provides a switching operation mechanism in which a switching operation is performed by sliding a sliding member by the rotation of a rotating operating member. The torsion spring on the rotating operating member side biases only when the rotating operating member rotates in one direction, and the tension coil spring on the sliding member side biases the rotating operating member when it rotates in the other direction. A switching operation mechanism for a tape recorder in which a biasing action is applied only when a sliding member slides in one direction due to movement, and the forces of both springs are set to "0" when the rotation operating member is in a neutral position. It provides:

Summary of the invention The present invention provides a switching operation mechanism for a tape recorder in which a switching member is operated by sliding a sliding member in conjunction with the rotation of a rotating operating member, and a torsion spring is provided on the rotating operating member side. A tension coil spring is arranged on each side of the sliding member, and the torsion spring on the side of the rotation operation member biases only when the rotation operation member rotates in one direction, and does not bias when the rotation operation member rotates in the other direction. The tension coil spring on the sliding member side is configured so that it biases only when the sliding member slides in one direction due to rotation of the rotating operating member in the other direction, and does not bias when the sliding member slides in the other direction. When the rotation operating member is in the neutral position, the forces of the two springs are mutually "0", so that even if the forces of the two springs are different from each other, the rotation operation member is reliably moved. It is possible to maintain the neutral position and return to the neutral position, so that the next operation can be carried out without any trouble, improving the reliability of the operation, and also simplifying the assembly work since there is no need for fine adjustment between each member.

Embodiment Hereinafter, an embodiment in which the switching operation mechanism according to the present invention is applied to a magnetic recording/reproducing device will be described with reference to the drawings.

FIG. 2 shows the internal configuration of an example of a tape transport in a magnetic recording/reproducing apparatus to which the present invention is applied, and shows the tape in a constant speed running state (playing state).

In the figure, reference numeral 11 denotes a constant-speed running operation plate, on which a recording/reproducing head 12 and a pinch roller 14 pivotally supported by an arm 13 are mounted, an operation lever 11a is integrally extended to the rear, and a front edge portion An operation button 15 is attached to the.

16 is a capstan, 17 is a recording operation lever, and guide holes 18a, 18b in the sliding direction are provided at the front and rear.
The support arm 21 of the erasing head 20 is rotatably attached to the guide shafts 19a and 19b. That is, the support arm 21 is provided with a frame portion 21a at the tip thereof into which the magnet serving as the erasing head 20 is fitted, and a tape guide claw 21a' is provided protruding from the inner edge side of one side of the frame portion 21a.
Further, a guide piece 21a'' is formed in the front-back direction on the front half of the other side, and is pivoted to the recording operation lever 17 by a shaft pin 22 at a position inward from the rear end of the rear part of the support arm 21. A locking pin 2 is formed with a long hole 21b that is long in the rotation direction between the rear end and the rear end, and is protruded from the recording operation lever 17.
3, and a protrusion 21c is provided protruding from the rear end, and this protrusion 21c and an auxiliary plate 24 arranged on the upper surface side of the recording operation lever 17 and fixed by the front guide shaft 19a. A tension coil spring 25 is placed between the protrusion piece 24a protruding from the side edge.
has been stretched.

A long hole 24b is formed in the auxiliary plate 24 in the sliding direction of the recording operation lever 17, and the locking pin 2
3, and a protruding piece 24c is provided on the front edge of the elongated hole 24b so as to come into contact with the rear front edge of the support arm 21 when the recording operation lever 17 is slid back. That is, the support arm 21 is connected to the recording operation lever 17.
When not in operation, the protrusion 21c at the rear end and the auxiliary plate 2
The erasing head 20 fitted to the tip is pulled by the tension coil spring 25 between the protruding piece 24a of the tape 4 and the front edge of the eraser is brought into contact with the front edge of the eraser head 24, and rotates forward. It is located farther forward. Also, in this state, the frame portion 21a
A guide piece 21a'' formed on the other side is engaged with a guide groove 26a formed in a tape guide piece 26 fixed to the constant speed running operation plate 11, so that the support arm 21 is held immobile.

When the constant speed traveling operation plate 11 is operated in this state, the guide groove 26a of the tape guide piece 26 moves along the guide piece 21a'' of the support arm 21, and the support arm 21 remains stationary.

Therefore, when recording, when the recording operation lever 17 is slid by pressing the push button 27 attached to its front end, the rear front edge of the support arm 21 is moved to the auxiliary plate 2.
Since the rear end is pulled by the tension coil spring 25, the front part is rotated inward about the shaft attachment part by the shaft pin 25 as the rotation center, and as the recording operation lever 17 slides. The entire body moves inward, and the guide piece 21a'' of the frame portion 21a is inserted into the guide groove 26a of the tape guide piece 26, so that the amount of protrusion of the erasing head 20 is determined.

When an outward pressing force is applied to the erasing head 20 in this predetermined position, the support arm 21 is rotated against the biasing force of the tension spring 25, and returned when the pressing force is removed. Note that instead of the protruding piece 24a of the auxiliary plate 24 against which the rear front edge of the support arm 21 comes into contact, a locking pin may be provided protruding from the chassis.

Reference numeral 28 designates a lock plate that is slidably arranged laterally below the constant speed driving operation plate 11 and the recording operation lever 17, and is engaged with a lock release operation plate 30 having an operation button 29 attached to its front edge. The constant speed running operation plate 11 and the recording operation lever 17 are pushed in, that is, locked in the operating state,
When the lock release operation plate 30 is pressed via the push button 29, the lock is released.

Reference numeral 31 denotes a fast-forward/rewind operating lever that is slidably operated by a seesaw-shaped push button 32, and an operating body 33 is pivotally connected to a chassis (not shown) by a shaft pin 34 corresponding to the intermediate portion of this operating lever 31. Ori,
This actuating body 33 has a protrusion 33a that comes into contact with a protrusion 36a of the switching lever 36 of the rewinding idler gear 35.
and a raised edge 33b that comes into contact with the rear edge 37a of the sliding lever 37, and a trochanter 38 is pivotally attached to the substantially intermediate portion and rolled into contact with the guide edge 39a of the intermediate guide hole 39 of the operating lever 31; A guide hole 40 is formed on the other side to engage a guide shaft 41 protruding from the chassis, and when the operating lever 31 is slid in the rewinding direction using a seesaw-shaped push button 32, the actuating body 33 moves into the trochanter. 38 is a guide edge 39a of the lever guide hole 39
Therefore, the actuating body 33 rotates about the pivot portion and the guide hole 40 aligns with the guide shaft 41.
The protruding piece 33a contacts the protruding piece 36a of the switching lever 36 and rotates it, and the raised edge 33b presses the sliding lever 37 and causes it to slide. Further, when the operating body 33 slides the operating lever 31 in the fast forward direction, the guide edge 39a of the lever guide hole 39 is separated from the trochanter 38, so that the actuating body 33 is not rotated and the switching lever 36 and the sliding lever 37
is not operated.

Further, an interlocking lever 43 is connected to the other end of the operating lever 31 via a substantially L-shaped rotating arm 42 so as to slide in a substantially orthogonal direction.
3 is the contact piece 4 of the motor drive circuit changeover switch 44.
An operating piece 46 for operating the switches 5a and 45b is fixed, and as the operating lever 31 slides in both directions, the interlocking lever 43 also slides to operate the contact pieces 45a and 45b of the changeover switch 44, and the motor drive circuit The rotation is switched to the high-speed rotation side, resulting in fast forward and rewind states.

Seesaw-shaped push button 3 that operates each operation in this way
2 and the operation lever 31 have an engaging recess 47 [47a,
47b, 47c] and correspondingly, a stopper arm 48 is arranged, biased in the return direction only when rotating in one direction by a torsion coil spring 49, and a projecting piece 31a is provided on the operating lever 31. A tension coil spring 51 is stretched between a protrusion 50 protruding from the chassis so that the push button 32 is biased toward the return direction only when the push button 32 slides in the other direction as the push button 32 rotates in the other direction. That is, a torsion coil spring 49 is wound around the shaft 32a of the push button 32, one end 49a of which is engaged with a pin on the chassis side (in the figure, the rear guide shaft 19b of the recording operation lever 17), and the other end 49b is engaged with the rear guide shaft 19b of the recording operation lever 17. The other side of the push button 32, in the figure, a part 52a of the engagement piece 52 with the operating lever 31
At the same time, the torsion coil spring 49 is engaged with an engagement pin 53 protruding from the chassis located near the engagement portion 52a, thereby applying an initial stress to the torsion coil spring 49. On the other hand, a tension coil spring 51 stretched between the operating lever 31 and the chassis is positioned behind the projecting piece 31a of the operating lever 31 so as to extend when the operating lever 31 slides in the direction in which it is pulled by the push button 32. It is stretched between the protruding piece 50 of the chassis.

Therefore, when the operating lever 31 slides in the rewinding direction (direction of arrow a) to rotate the push button 32 (rotated counterclockwise in the figure), the other end 49b of the torsion coil spring 49 is pressed against the push button 32. , engagement piece 52
The stress is increased by being pressed by the engaging portion 52a of
On the other hand, the tension coil spring 51 on the operating lever 31 side is not operated. When the push button 32 is returned to the neutral position from this state, it is rotated by the biasing force of the torsion coil spring 49, and the operating lever 31 is also returned to the neutral position.

Further, when the push button 32 is rotated so that the operation lever 31 slides in the fast forward direction (clockwise in the figure), the other end 49a of the torsion coil spring 49 engages only with the engagement pin 53. The stress of the torsion coil spring 49 does not act on the push button 32, leaving it in a free state, while the tension coil spring 51 on the operating lever 31 side is pulled and expanded, increasing its stress. When the push button 32 is returned to the neutral position from this state, the biasing force of the tension coil spring 51 on the operating lever 31 side is applied via the operating lever 31, and the push button 32 is returned to the neutral position together with the operating lever 31.

In this manner, the torsion coil spring 49 and the tension coil spring 51 operate without interfering with each other when the push button 32 is operated for rewinding or fast forwarding.

54 is a timing lever that is slidably engaged with the operating lever 31 in its longitudinal direction. That is,
The timing lever 54 is disposed at the rear half of the operating lever 31, and has a corresponding raised edge 54 at its front end that overlaps the rear surface 37b of the sliding lever 37.
a, and long guide holes 54b and 54c are formed in the front and rear portions in the front and rear directions to engage with engagement pins 55a and 55b protruding from the operation lever 31. It is slidable and has a protruding piece 54d protruding from one side edge, and between this protruding piece 54d and a protruding piece 31b located rearward from this protruding piece 54d and protruding from one side edge of the operating lever 31. Stretch the tension coil spring 56 to the timing lever 5.
4 is always biased towards the rear.

On the other hand, an engaging pin 57 is attached to the rear surface 37b of the sliding lever 37 so that it is at the same position as the edge of the raised edge 54a of the timing lever 54 when the sliding lever 37 is pressed and slid by the actuating body 33. It is installed protrudingly.

Here, when the operating lever 31 is slid in the rewinding direction, that is, backward, the sliding lever 37 is pressed and slid by the actuating body 33 as described above, and the timing lever 54 moves rearward together with the operating lever 31. Then, the edge of the raised edge 54a comes into contact with the engagement pin 57 of the sliding lever 37, and the sliding lever 37 is held in the sliding position.

As the sliding lever 37 slides, the moving lever 59 of the idler gear 58 is slid, and the idler gear 58 is disengaged from the winding reel gear 60, and the rewinding idler gear 35 is moved to the operating body 3.
3, the switching lever 36 engages the idler gear 58 and the supply reel gear 61, and the supply reel gear 61 is rotated to perform a rewinding operation.

When the operating lever 31 is returned to the neutral position from this state, the operating body 33 is also returned, and accordingly, the switching lever 36 and the sliding lever 37 are returned, and the meshing of both idler gears 35 and 58 is released, and the idler gear 58 is It will be meshed with the winding side reel gear 60, but when the operating lever 31 returns to the neutral position, the engaging pin 57 of the sliding lever 37
is in contact with the edge of the raised edge 54a of the timing lever 54, and while the contact between the two continues, that is, the raised edge 54 of the timing lever 54
While a corresponds to the engaging pin 57 of the sliding lever 37, the sliding lever 37 is not returned, and therefore the moving lever 59 is held at the moving position, and the idler gear 58 is connected to the rewinding idler gear 35 and the winding side reel gear. 60, and when the raised edge 54a of the timing lever 54 comes off the engagement pin 57 of the sliding lever 37, the sliding lever 37
is slid back, and along with this, the moving lever 59 is also returned, and the idler gear 58 is meshed with the take-up side reel gear 60.

When the operating lever 31 is returned from the rewinding state to the neutral state in this way, the idler gear 58 separates from the rewinding idler gear 35 and then meshes with the reel gear 60 on the winding side, causing both reel gears 60 and 61 to rotate simultaneously. without moving, and
In a constant speed running state, the idler gear 58 does not come into contact with the rewinding idler gear 35 and generate gear noise when the rewinding operation is canceled.

In addition, 62 is a shut-off device, which is composed of a tension arm 63 and a shut-off gear 64.
The rear end of the tension arm 63 is in contact with the shutter-off gear 64, and is moved as the constant speed running operation plate 11 slides, so that the tip of the tension arm 63 is placed in a tape in a cassette (not shown). It is inserted slightly inward from the running surface, and its tip abuts against the tape so as to be pushed into it, and the shut-off gear 64 is positioned close to the idler gear 58.

In this state, the tape tension increases as the tape reaches the end of its running, and when the tape running surface becomes tense, the tension arm 63 is pushed outward and presses the shut-off gear 64, causing it to rotate and mesh with the idler gear 58. . Therefore, the shutter-off gear 64 is rotated further by the idler gear 58, and the lock plate 2 that is engaged with the idler gear 58 is rotated by the idler gear 58.
8 to release the lock on the constant speed running operation plate 11, the constant speed running operation plate 11 is returned, and the tape running drive mechanism is stopped.

As described above, in this example, the torsion coil spring 49 is disposed on the side of the seesaw-shaped push button 32 as a rotating operation member, and the tension coil spring 51 is disposed on the side of the operation lever 31 as a sliding member.
The torsion coil spring 49 acts only when the push button 32 rotates in one direction (counterclockwise in the figure).
When rotating in the other direction, there is no biasing action, and the tension coil spring 51 on the operating lever 31 side serving as a sliding member acts in one direction on the operating lever 31 when the seesaw-shaped push button 32 rotates in the other direction (clockwise in the figure). (The direction opposite to arrow a) biases the springs 49 and 51. When the seesaw push button 32 is in the neutral position, the force of both springs 49 and 51 is Both springs 4 and 4 become "0".
Even if the forces of the push buttons 9 and 51 are different from each other, the seesaw push button 32 is maintained at the neutral position and returned to its original position.

Therefore, the neutral point of the push button 32 and the operating lever 31 can be obtained regardless of the difference in biasing force between the springs 49 and 51.

In this example, the present invention is applied to a magnetic recording/reproducing device, but it can also be applied to other switch mechanisms.

Effects of the Invention As described above, according to the present invention, separate torsion springs and tension coil springs are arranged for the rotation operation member and the sliding member that operate in conjunction with each other, and these springs are arranged so that the rotation operation member is in the neutral position. Since the configuration is such that the forces are mutually zero at certain times, even if the forces of both springs are different, the rotation operating member is reliably held at the neutral position and returned to the next operation. The operation can be performed without any problems and operates reliably, improving reliability.In addition, of both springs, a torsion sling that can easily apply force in the rotational direction is installed on the rotating operation member side, and a torsion sling that easily applies force in the rotational direction is installed on the sliding member side. By arranging each tension coil spring that can easily apply force in a linear direction and using these two springs in combination, operation and movement can be performed smoothly. Furthermore, there is no need for fine adjustment between the two members and between the springs, thereby simplifying the work.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted plan view of an example of a tape transport of a magnetic recording/reproducing device to which the switching mechanism according to the present invention is applied, Fig. 2 is a plan view of the same part, and Fig. 3 is an exploded perspective view of the main parts. It is a diagram. In the figure, 31 is an operating lever as a sliding member;
2 is a seesaw-shaped push button as a rotating operation member, 49
51 is a torsion coil spring, and 51 is a tension coil spring.

Claims (1)

[Scope of Claim for Utility Model Registration] In a switching operation mechanism for a tape recorder in which a switching member is operated by sliding a sliding member in conjunction with the rotation of a rotating operating member, a torsion is provided on the rotating operating member side. A spring and a tension coil spring are respectively disposed on the sliding member side, and the torsion spring on the rotational operation member side biases only when the rotational operation member rotates in one direction, and when the rotational operation member rotates in the other direction. Sometimes there is no biasing action, and the tension coil spring on the sliding member side only biases when the sliding member slides in one direction due to rotation of the rotating operation member in the other direction, and when sliding in the other direction. A switching operation mechanism for a tape recorder which is constructed so as to avoid biasing action.