JPH0337051Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a push button lock plate that is most suitable for application to tape recorders and the like.

[Summary of the idea]

The present invention is a push-button lock plate for a tape recorder, etc., in which a push-button lock plate having a push-button locking part and a lock-releasing part, and a return spring whose one end is connected to the push-button lock plate are integrally molded from synthetic resin. This makes it possible to reduce the number of parts and the number of assembly steps for a tape recorder, etc.

[Conventional technology]

BACKGROUND ART Conventionally, push button lock plates for tape recorders and the like have been usually pressed from sheet metal, and coil springs have been used for the return springs.

[Problem that the invention attempts to solve]

However, such a push button lock plate structure consisting of two parts requires a large number of parts such as a tape recorder and a large number of assembly steps, resulting in high costs. In particular, the work of latching a coil spring used as a return spring is extremely troublesome, and automatic assembly is difficult.
In addition, burrs are likely to occur in the locking and unlocking portions of the push button of a push button lock plate that is pressed from sheet metal. This burr is serious, and if the push button gets caught in the burr, the push button cannot be moved back and forth smoothly, and the push button becomes difficult to operate.

The present invention allows the push button lock plate and the return spring to be constructed as a single molded part, and also improves the operability of the push button.

[Means for solving problems]

The present invention is a push button lock plate in which a push button lock plate having a push button locking part and a lock releasing part, and a return spring whose one end is connected to the push button lock plate are integrally molded from synthetic resin.

[Effect]

In the present invention, the push button lock plate and the return spring are integrally connected and constitute a single molded part. Moreover, burrs do not form on the sheet metal in the locking and unlocking parts of the push button molded from synthetic resin.

〔Example〕

An embodiment of a cassette tape recorder to which the present invention is applied will be described below with reference to the drawings. The cassette tape recorder shown here is a reproduction-only machine that uses a compact cassette.

First, the entire cassette tape recorder will be explained with reference to FIGS. 3 to 7.

First, a conventionally known cassette (compact cassette) 1 has a pair of left and right reel hubs 2a, 2b inside.
A cassette tape 3, which is a magnetic tape wound around the tape, is housed in the head insertion hole 4, a pair of left and right pinch roller insertion holes 5a and 5b, capstan insertion holes 6a and 6b, and a cassette positioning pin insertion hole 7.
a, 7b, reel stand insertion holes 8a, 8b, etc. are provided.

Next, the printed circuit board 10 constitutes the electronic circuit of the tape recorder, and a large number of electronic components 12 are mounted at predetermined locations on the printed wiring pattern 11. In this case, the upper surface 10a of the printed circuit board 10 is configured as a wiring pattern surface, and the lower surface 10b is configured as a component mounting surface.

Next, this printed circuit board 10 is used as a chassis for a tape recorder, and this printed circuit board 10 includes a pair of left and right reel stands 13.
a, 13b, a cassette mounting table 14, a cassette pressing spring 15 made of a leaf spring, a pair of left and right cassette positioning pins 16a, 16b, a capstan 17,
a motor 18, a magnetic head 19 which is a reproduction head,
Pinch roller 20, tape guide 21, head mount 22, play button 23, fast forward button 24, stop button 25
Mechanical parts such as push buttons, push button lock plates 26, and various other mechanical parts such as various springs, levers, and switches are attached.

By the way, the pair of left and right reel stands 13a, 13b
is rotatably attached to the upper surface 10a of the printed circuit board 10 via a pair of left and right reel stand bearings 28, and similarly, the cassette mounting table 14 and the cassette pressing spring 15 are also attached to the upper surface 10a of the printed circuit board 10. There is.

In addition, a pair of left and right cassette positioning pins 16
a, 16b, a capstan 17, and a motor 18 are attached to the upper part of a guide base 29 made of synthetic resin. However, the cassette positioning pins 16a and 16b are integrally molded on the guide base 29, and the capstan 17 and motor 18 are rotatably and fixedly attached to a capstan bearing 30 and a motor mounting portion 31 that are integrally molded on the guide base 29. There is. And guide base 2
9 has a structure in which each pair of locking pawls 32 integrally molded at both ends in the longitudinal direction locks into each pair of locking holes 33 provided in the printed circuit board 10, so that it can be attached to and removed from the lower surface 10b side of the printed circuit board 10. installed as possible. and cassette positioning pins 16a, 1
6b and the capstan 17 are inserted into the upper surface 10 from the insertion holes 34a, 34b, and 35 provided in the printed circuit board 10.
It protrudes to the a side. The motor 18 is connected to a predetermined location of the wiring pattern 11 of the printed circuit board 10 by a lead wire 50.

Further, the magnetic head 19, pinch roller 20, and tape guide 21 are attached to the upper part of a head mount 22 made of synthetic resin. However, the tape guide 21 is integrally molded with the head mounting base 22. The head mounting base 22 is arranged on the upper surface 10a side of the printed circuit board 10, and the guide base 22
The head mounting base 22 is placed on the top of a pair of protrusions 37 that protrude from the opening 36 provided in the printed circuit board 10 to the top surface 10a, which is integrally molded on the upper part of the head mounting base 22. T did
A locking pawl 39 integrated with the shaped guide piece 38 is locked into guide holes 40 and 41 provided in the printed circuit board 10 and the guide base 29, so that it can freely slide on the upper surface 10a side of the printed circuit board 10 and can be attached and detached. installed.

Further, the push button lock plate 26 is slidably screwed to the lower part of the guide base 29 by a pair of set screws 43 inserted through a pair of elongated holes 42 provided at both ends of the push button lock plate 26 in the longitudinal direction. Push buttons such as a fast forward button 24 and a stop button 25 are arranged between a guide base 29 and a push button lock plate 26, and these push buttons have a T-shaped guide piece 4 integrally formed on the upper part thereof.
4, 45 as printed circuit board 10 and guide base 2
It is slidably attached to guide holes 46 and 47 provided in 9. However, the regeneration button 23 is integrally molded with the head mounting base 22. The sliding members such as the head mounting base 22, fast forward button 24, stop button 25, push button lock plate 26, etc. are each biased back by a return spring 48, and the motor 18, reel stand 13b, and capstan 17 are interlocked by a belt 49.

The cassette tape recorder is constructed as described above, and the cassette 1 is mounted horizontally on the top surface 10a of the printed circuit board 10 as shown by the chain lines in FIGS. 3 and 5 to 7, and the reel hubs 2a and 2b are While engaging the reel stands 13a and 13b, the cassette tape 3 is wrapped around the capstan 17. At this time, the cassette 1 is attached to the cassette positioning pin 16a,
16b and the cassette mounting table 14, and is fixed by the cassette pressing spring 15, the cassette 1 is horizontally positioned at a predetermined height position with respect to the guide base 29.

After the cassette is installed, when the play button 23 is pushed from the backward movement position shown by the chain line to the forward movement position shown by the solid line in FIG. 6, the head mount 22 is slid to the forward movement position against the return spring 48. , is locked by a push button lock plate 26. Then, the magnetic head 19, the pinch roller 20, and the tape guide 21 are inserted into the cassette 1.
is in contact with the cassette tape 3, and the pinch roller 2
0, the cassette tape 3 is transferred to the capstan 17.
is crimped. Then, a switch (not shown) attached to the printed circuit board 10 by the head mount 22 is operated, and the motor 18 is activated.
The reel stand 13b and the capstan 17 are rotationally driven. The cassette tape 3 is then run at a constant speed by the capstan 17 to perform desired reproduction.

Incidentally, when the fast forward button 24 is pressed, the switch is operated in the same manner, the motor 18 is activated, and the cassette tape 3 is fast forwarded by the reel stand 13b.

Furthermore, when the stop button 25 is pressed during playback or fast forward, etc., the head mounting base 22 or the fast forward button 24 are unlocked by the push button lock plate 26, and these are moved back by the return spring 48 and the switch is turned off. is turned off, and the motor 18 is stopped.

Next, details of the push button lock plate 26 will be explained with reference to FIGS. 1 to 2B.

First, as shown in FIG.
54 and a lock release part 55 by the stop button 25 are provided in a horizontal line, and a pair of elongated holes 42 are provided at both ends in the longitudinal direction. In this case, the locking parts 53 and 54 and the locking part 55 are
are formed by upper and lower through holes, and the lock portions 53 and 54 have substantially hook-shaped inclined sides 53a and 5.
4a and recesses 53b and 54b are provided,
The lock release portion 55 is provided with only an inclined side 55a.

The push button lock plate 26 and a substantially U-shaped return spring 56 having one end 56a connected to the push button lock plate 26 are integrally molded of synthetic resin. Note that a vertical pin 57 is integrally molded on the upper part of the other end 56b of the return spring 56.

Next, as shown in FIGS. 2A and 2B, this push button lock plate 26 has a pair of elongated holes 42 as described above.
The playback button 23 is screwed to the lower part of the guide base 29 by a pair of set screws 43 inserted through the
It is assembled so as to be slidable in the directions of arrows a and b perpendicular to the fast forward button 24 and the stop button 25. The pin 57 of the return spring 56 is locked from below into a locking hole 58 (see FIG. 4) provided in the printed circuit board 10, and the return spring 56 locks the push button lock plate 2.
6 is biased backward in the direction of arrow a.

On the other hand, as mentioned above, a lock pin 59 is integrally molded at the lower part of the head mounting base 22 made of synthetic resin, on which the regeneration button 23 is integrally molded. 41 and is inserted into the lock portion 53 of the push button lock plate 26 from above. Similarly, the fast forward button 24 and the stop button 25 are also molded from synthetic resin, and a lock pin 60 and a lock release pin 61 that are integrally molded at the bottom of these buttons are attached to the lock portion 54 and the lock release portion 55 of the push button lock plate 26. It is inserted from above.

Next, the locking and unlocking operations of the push button will be explained with reference to FIGS. 2A and 2B.

First, when the cassette tape recorder is in a stopped state, the play button 23, fast forward button 24, and stop button 25 are moved back to the return position shown by the solid line in FIG. 2A, and the push button lock plate 26 is also moved by the return spring 56. In FIG. 2A, it is moved back to the back movement position shown by the solid line.

Next, in order to switch the cassette tape recorder to the playback state, when the playback button 23 is pushed in the direction of arrow c against the return spring 48 to the forward position shown in FIG. 2B, the lock pin is locked as shown by the chain line in FIG. 2A. 59
presses the inclined side 53a of the lock portion 53, causing the push button lock plate 26 to slide (move forward) in the direction of arrow b against the return spring 56. At the moment when the regeneration button 23 is moved forward to the forward position, the push button lock plate 26 is slid (backward movement) in the direction of arrow a by the return spring 56.
As shown in FIG. 2B, the lock pin 59 is engaged with the recess 53b of the lock portion 53, and the playback button 23 is locked in the forward position. Note that the same applies to the fast forward button 24.

Next, in order to switch the cassette tape recorder from the playback state or fast-forward state to the stop state, the stop button 25 is pushed in the direction of arrow c against the return spring 48 to the forward position shown by the chain line in FIG. 2B, and the lock is released. The pin 61 pushes the inclined side 55a of the lock release part 55, and the push button lock plate 26 is also slid (moved forward) in the direction of arrow b against the return spring 56, as shown by the chain line in FIG. 2A. Then, the lock pin 59 or 60 of the playback button 23 or the fast-forward button 24, which is locked in the forward position, is unlocked, and the playback button 23 or the fast-forward button 24 is moved to the second A by the return spring.
It is moved backward in the direction of arrow d to the backward movement position indicated by the solid line in the figure. Note that the stop button 25 is not locked in the forward movement position, and when the finger is released from the stop button 25 after that, the return spring 48 causes the stop button 25 to move back in the direction of the arrow d.

Thus, the locking portions 53, 54 and the unlocking portion 5 of the push button locking plate 26 are molded from synthetic resin.
Since the coefficient of friction between the lock pins 59 and 60 and the lock release pin 61 relative to the lock pin 5 is extremely small, the regeneration button 2
3. The fast forward button 24 and the stop button 25 can be smoothly reciprocated in the directions of arrows c and d, and the push buttons have good operability.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments, and various effective changes can be made based on the technical idea of the present invention.

For example, in the embodiment, a linearly moving push button lock plate is shown, but a rotating push button lock plate may also be used.

Furthermore, the present invention is not limited to push button lock plates for cassette tape recorders.

[Effect of idea]

In the present invention, since the push button lock plate and the return spring can be constructed as a single molded part, the number of parts and the number of assembly steps for a tape recorder etc. can be greatly reduced, resulting in low cost. Moreover, since no sheet metal burrs occur on the locking portion and the unlocking portion of the pushbutton lock plate, the pushbutton can be smoothly reciprocated and the pushbutton has good operability.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a perspective view of the main parts, Fig. 2A and Fig. 2B.
The figure is a bottom view of the main parts, Figures 3 and 4 are exploded perspective views of the whole, Figure 5 is a plan view of the whole, and Figure 6 is a
FIG. 7 is a view in the direction of the arrows in FIG. 5. Also, in the symbols used in the drawings, 23...
Play button, 24...Fast forward button, 25...Stop button, 26
...Push button lock plate, 53...Lock part, 54...
Lock part, 55...Lock release part, 59...Lock pin, 60...Lock pin, 61...Lock release pin.

Claims (1)

[Scope of utility model registration request] This push button lock plate includes a push button lock plate having a push button locking part and a lock releasing part, and a return spring whose one end is connected to the push button lock plate, which are integrally molded from synthetic resin.