JPS6220912Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to a push button device, and more particularly to a push button device suitable for a pause mechanism for temporarily stopping recording or playback operations in a tape recorder.

(Prior Art) A push button device, for example, a push button device used in a pause mechanism of a tape recorder, locks an operating member attached to the push button by pushing the push button.
Self-locking push button devices are often used, which release the lock and return when pressed again.

As a locking mechanism used in this type of push button device, a mechanism is well known in which the push button device is provided with an engaging member and the locking member is engaged with the locking portion of the operating member of the pressed push button to lock the push button device. It is being

(Problems to be solved by the invention) However, in a push button device having such a configuration, a mechanism for supporting the locking member of the lock mechanism is required, and a spring or a spring for biasing the locking member is required. However, since a locking member for locking the spring is required, the number of parts of the device increases and assembly is troublesome. Further, a space is required for arranging the locking member and the spring that biases the locking member, which makes it difficult to downsize not only the push button device but also the tape recorder. Furthermore, since each requires a spring, there is also the problem that the management of the springs becomes complicated.

(Purpose of the invention) The present invention was made to solve the above-mentioned drawbacks, and the rotational moment of the locking member increases due to the return biasing force of the spring member during the pressing operation, increasing the locking force and ensuring the locking. The purpose of the present invention is to provide an inexpensive push button device which has a simple structure and a small number of component parts.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a main body substrate in which a cam groove is formed, a push button operating member provided movably along this main body substrate, and a push button operating member provided movably along this main body substrate. A lock member that penetrates through the operating member and is rotatably provided around the through-fitting portion as a fulcrum, and has an engaging portion at one end that engages with the cam groove; a spring member that is hooked to the end and the main body board, applies a rotational moment to the cam groove side with respect to the lock member using the through-loose fitting portion as a fulcrum, and also applies a return biasing force to the push button operating member via the lock member; When the push button operating member is pushed from a non-operating position to an operating position, the spring member acts with a large return biasing force to increase the rotational moment with respect to the locking member, thereby increasing the engagement holding force with respect to the cam groove. It is characterized in that the locking member is securely engaged with the cam groove.

(Function) In the present invention, the rotational moment of the locking member increases due to the return biasing force of the spring member during the pressing operation, so that the locking force increases and the locking is performed reliably. In addition, since the spring member is used both to return the operating member and to bias the locking member, assembly and spring management are easier, and a better locking feel can be obtained.Moreover, since the cam is formed on the board, it is not a component. It is possible to reduce the amount of noise and make the device smaller.

(Example) The details of the present invention will be explained below with reference to the drawings.

1 to 3 are a plan view, a partially sectional view, and a partially exploded perspective view showing an embodiment of the present invention,
An example of use in the pause mechanism of a tape recorder is shown.

In FIG. 1, a flywheel gear 1 has a capstan 2, a flywheel (not shown) is pivotally attached, and is also pivotally supported by a main body board (not shown). (also not shown) is rotated independently of the running of the tape.

Further, a head chassis 3 with a recording/reproducing head and an erasing head attached thereto is arranged parallel to the main body board so as to be movable forward and backward. This headshaft 3 is biased toward the stop position (downward in the figure) and moves forward as shown in Figure 1 in conjunction with a playback operator (not shown). Two engaging portions 4 and 5 are provided in a protruding manner.

The pinch roller 6 is rotatably supported at the end of a pinch roller lever 8 which is pivotally attached to a shaft 7, and is biased so as not to come into pressure contact with the capstan 2 when the tape recorder is stopped. 1
As shown in the figure, the pinch roller 6 is configured to come into contact with the capstan 2 in conjunction with the advancement of the headshaft 3.

In addition, the pinch roller lever 8 has a head shaft 3.
A locking piece 9 that engages with the engaging portion 5 is provided in a protruding manner to enable the pinch roller lever 8 to rotate counterclockwise in conjunction with the retreat of the headshaft 3. In addition, the pinch roller lever 8 includes the pinch roller 6 and the shaft 7.
A pin 10 is provided on the opposite side.

Further, a take-up reel stand 11 is rotatably supported on the main body board.

Also, the winding gear base 12 supported by the main body board
is biased in the direction of the headshaft 3 and rotatably supports the take-up gear 13. This take-up gear base 12 has a protrusion 14 extending in the direction of the headshaft 3, and has a pin 15 at its tip that engages with the engagement part 4 of the headshaft 3, and a pin 16 on the opposite side of the pin 15. We are prepared. When the headshaft 3 is in a backward state, that is, in a stopped state,
The pin 15 engages with the engaging portion 4 and is pushed out in the direction away from the headshaft 3 against the urging force, and is separated from the flywheel gear 1 and the take-up reel stand 11, and as the headshaft 3 advances during playback. ,
As shown in FIG. 1, the pin 15 is removed from the engaging portion 4 and the take-up gear 13 is brought into engagement with the flywheel gear 1 and the take-up reel stand 11.

During playback, the rotational driving force of the flywheel gear 1 is transmitted to the take-up reel stand 1 via the take-up gear 13.
1, and the winding roll table 11 is rotated. The take-up reel stand 11 is configured to receive rotational driving force from the flywheel gear 1 via another fast-feed idler (not shown) during a fast-feed operation.

The pause operation plate 17 is slidably supported by the main body board, has a locking part 18 protruding from its side surface, and has a chevron-shaped protrusion at its tip that engages with the pin 16 of the winding gear base 12. A portion 19 is formed. When the pause operation plate 17 is pushed in, the inclined tip of the protrusion 19 comes into contact with the pin 16, and the winding gear base 1
The locking portion 18 contacts the pin 10 of the pinch roller lever 8 to rotate the pinch roller lever 8 counterclockwise so as to separate it from the head shaft 3 against the biasing force of the pinch roller lever 8.

Further, one end of a spring 20 is hooked to the pose operation plate 17, and this spring 20 applies a returning force to return the operation plate 17.
The other end of 0 is hooked to the main body board.

Further, a through-fitting portion of a lock lever 21 is loosely fitted into the pause operation plate 17, and the tip of the lock lever 21 engages with a cam groove provided on the main body board, thereby forming a cam portion 22 to be described later. .

FIGS. 2 and 3 are views explaining the above-mentioned cam portion 22 in detail. In the figure, the pose operation board 17
An L-shaped crank-shaped lock lever 21 is loosely fitted through the hole 23 provided in the hole 23, and the tip 21' of the lock lever 21 is formed on the opposite surface of the main body board 24 facing the pose operation plate 17. It engages with a known heart-shaped cam groove 25. Then, by operating the pose operation board 17, the lock lever 2 is
The tip 21' of the cam groove 25 revolves around the circumferential wall of the heart-shaped cam groove 25. Note that the trough in the cam groove 25 is a locking part 26 that serves as the lock position of the pose operation plate 17, and when the tip 21' of the lock lever 21 is engaged with this trough, the pause operation plate 17 is in the locked state. , which constitutes a so-called push button mechanism.

The operation of the push button device of the present invention thus constructed will now be described with reference to FIGS.

When the playback operation panel of the operation mechanism of the tape recorder is operated, as shown in FIG.
moves forward and the recording/reproducing head comes into contact with the tape, and the pinch roller lever 8 rotates clockwise in conjunction with the advance of the head shaft 3, causing the pinch roller 6 to come into contact with the capstan 2.

Further, the pin 15 of the take-up gear base 12 is disengaged from the engaging portion 4 of the head shaft 3 and is displaced by the urging force, and the take-up gear 13 is engaged with the flywheel gear 1 and the take-up reel stand 11, respectively. The reel stand 11 rotates to perform a reproducing operation.

Then, when the pause operation plate 17 is pushed in and operated as shown in FIG. 4 during the playback operation, the locking part 18 of the pause operation plate 17 pushes up the pin 10 of the pinch roller lever 8, so the pinch roller lever 8 is reversed. The pinch roller 6 separates from the capstan 2 by rotating clockwise. On the other hand, the inclined part of the protruding part 19 at the tip of the pause operation plate 17 is connected to the pin 1 of the winding gear base 12.
6 to slide the take-up gear base 12 to the right in the figure against the urging force. As a result, the take-up gear 13 includes the flywheel gear 1 and the take-up reel stand 1.
1, the rotational driving force of the flywheel gear 1 is cut off, and the rotation of the reel stand 11 is stopped.

At this time, the tip 21' of the lock lever 21, which is locked to the pause operation plate 17, is positioned near the valley of the cam groove 25, and when the pressing force of the pause operation plate 17 is removed, the return urging force of the spring 20 causes the lock lever 21 to pause. The operation plate 17 tries to return, but the tip 21' of the lock lever 21 falls into the locking part 26 of the cam groove 25 and is locked, so the pause operation plate 17 is locked at the slightly returned position. As a result, the pinch roller 6 is transferred from the capstan 2, and the take-up gear 13 is transferred from the flywheel gear 1 to the take-up reel stand 1.
1, a pause state in which playback of the tape recorder is stopped is maintained.

Then, when the pause operation plate 17 is pushed again, the tip 21' of the lock lever 21 comes off the locking part 26 of the cam groove 25, goes around the circumferential wall of the cam groove 25, and moves toward the tip of the cam groove 25, so that the pause operation can be performed. Board 17
is returned via the lock lever 21 by the return biasing force of the spring 20.

Then, the pinch roller 6 is released from the pin 10 and rotates clockwise due to the biasing force, and presses against the capstan 2, while the pin 1 of the take-up gear base 12
6 and the protrusion 19 are also released, the take-up gear base 12 is returned by force, and the take-up gear 13 is engaged with the flywheel gear 1 and the take-up reel stand 11. Therefore, the rotational driving force of the flywheel gear 1 is transmitted to the reel stand 11, and playback is restarted.

In the above-mentioned embodiment, an example was explained in which the push button device was applied to a pause mechanism, but the present invention is not limited to the pause mechanism, but can be applied to various push button devices such as an operation mechanism of a tape recorder.

(Effects of the Invention) As explained above, the push button device of the present invention allows the engaging portion of the locking member, which is engaged with the operating member of the push button that is biased in the return direction, to be connected to the main body base facing the operating member. A spring member that engages with a cam groove formed on the opposing part and returns the operating member also serves as the locking function of the locking member, and the returning urging force acting on the operating member engages the locking member to the locked position. Since the operating member is configured to be lockable in this manner, the rotational moment of the locking member increases due to the return biasing force of the spring member during the pressing operation, thereby increasing the locking force and ensuring locking. In addition, there is no longer a need for locking members, etc., as in conventional push-button devices, and the number of parts that make up the locking member of the push-button device is reduced, making effective use of existing parts, reducing costs and simplifying assembly. It becomes possible to achieve this goal. Furthermore, there is no need to provide a locking member to the push button device,
Since the device can be made smaller, it can contribute to the reduction in the size of audio equipment such as tape recorders.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing one embodiment of the push button device of the present invention, FIGS. 2 and 3 are an enlarged sectional view and an enlarged exploded perspective view of the cam portion shown in FIG. 1, and FIG. 4 is the same as that shown in FIG. FIG. 3 is a plan view illustrating the operation of the embodiment shown in FIG. 1...Flywheel gear, 2...Capstan, 3...Headshaft, 4, 5...Engaging portion, 6
...Pinch roller, 8...Pinch roller lever,
10...Pin, 11...Take-up reel stand, 12...
Winding gear base, 13... Winding gear, 15, 16...
... Pin, 17 ... Pose operation member, 20 ... Biasing member, 21 ... Lock member, 22 ... Cam part, 2
4...Main board, 25...Cam groove, 26...Locking portion.

Claims (1)

[Scope of Claim for Utility Model Registration] A main body board with a cam groove formed therein, a push button operating member movably provided along this main body board, and a push button operating member that penetrates through this push button operating member and uses this penetrating loose fitting portion as a fulcrum. a lock member that is rotatably provided and has an engaging portion at one end that engages with the cam groove; the other end of the lock member that passes through the push button operating member is hooked to the main body board; On the other hand, a spring member is provided that applies a rotational moment to the cam groove side using the penetrating loose fitting part as a fulcrum and also applies a return biasing force to the push button operating member via a locking member, so that the push button operating member is pressed from a non-operating position. The large return urging force exerted by the spring member at the operated operating position increases the rotational moment with respect to the lock member, thereby increasing the engagement holding force with respect to the cam groove, thereby ensuring engagement of the lock member with the cam groove. A push button device characterized by: