JPS5939386Y2 - Muting switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a muting switch for a sound reproduction device, and particularly to a muting switch for a tape cassette type sound reproduction device.

In a sound playback device that uses a tape cassette, insert the tape cassette halfway into the cassette insertion slot, then push it in a little with your finger.The tape cassette is automatically sucked into the sound playback device and placed in the playing position. Once installed, it will start playing automatically.

When performing fast forward or rewind operations during use, press the fast forward button or rewind button to perform these operations.

If you want to stop playing or remove the tape cassette after playing, press the eject button.

With this operation, the tape cassette is removed from the playing position and becomes half protruded into the cassette insertion slot, and thereafter, if desired, the tape cassette can be pulled out by hand.

By the way, in the above-mentioned sound reproducing apparatus, when performing a fast forward or rewind operation, the magnetic tape is in contact with the magnetic head, so a cue sound is generated.

As a countermeasure, the muting switch operating body is connected to the operating lever for fast forwarding or rewinding.
When the fast forward or rewind button is pressed, a muting switch is operated via the operating lever and operating body, and a muting circuit prevents the cue sound from coming out of the speaker.

Also, a cue sound is generated momentarily when ejecting, but
The eject lever has a long operating stroke because it stores energy in the drive spring that automatically retracts the tape cassette to the playing position, so leaf switches, micro switches, etc. have short operating strokes. If used as a muting switch, it would be necessary to precisely align and install the switch at the part of the eject lever's operating stroke that generates the cue sound, but this work requires great skill and time. .

The present invention is a new invention that improves the above-mentioned drawbacks of the conventional technology, and its purpose is to enable the operating part to be directly connected to the eject lever and to be able to be installed anywhere near the eject lever. The objective is to provide a muting switch that is suitable for

An embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, 1 is a plate-shaped frame member made of synthetic resin.

A hole 1a is formed in the center of the frame member 1 and extends from the front surface to the back surface, and mounting holes 1b are provided in the corners.

Projections 1c and 1d for holding contacts are protruded from both sides of the center of the hole 1a.

Two contacts 2 and 3 are arranged in parallel in the hole 1a, and contacts 2a and 3a are attached to them, respectively.

4 is a terminal connected to the contactor 2, and 5 is a terminal connected to the contactor 3.

A friction member 6 made of rubber or synthetic resin is attached to the tip of the contact 2.

7 is an operating rod. The operating rod 7 is movably inserted into a through hole provided in the frame member 1, and a portion thereof is exposed in the hole 1a, and the 7-reaction member 6 is in contact with the surface of the operating rod 7.

7a and 7b are E fitted to both ends of the operating rod 7, respectively.
The IJ ring 8 is inserted between the E ring 7a and the frame member 1.

It is also a spring wound around the operating rod 7.

The operating rod 7 is moved leftward in FIG. 1 by this spring 8.

Although not shown in FIG. 1, after the switch is assembled, both sides of the frame member are covered with lid members to prevent dust from entering inside.

Alternatively, the frame member may be configured such that a recess is provided in this portion without providing a hole, a switch mechanism is built into the recess, and the lid is covered only on the front side.

FIG. 2 is a perspective view showing a state in which the switch 9 for a sound reproduction device according to the present invention is attached to the end of an eject lever 10 with a screw 11, and FIG. screw 1 on the side of
1 and attach the arm 10 of the eject lever 10.
FIG. 7 is a perspective view showing a state in which the control rod a is brought into contact with the operating rod 7;

In either case, when it is desired to take out the tape cassette from the audio reproduction device, the eject lever 10 is pressed in the direction of the arrow.

At this time, the muting switch 9 for the sound reproduction device
The operating rod 7 is pushed by the eject lever 10, and the muting switch 9 is activated.

That is, when the operating rod 7 is pushed in a little, the friction member 6 moves together with the operating rod 1 as shown in FIG. The muting circuit will operate and the cue sound will no longer be emitted from the speaker.

When the operating rod 7 is subsequently pressed, it moves in the longitudinal direction while pressing the friction member 6 that is in contact with the side surface of the operating rod 7.

The contact between the contacts 2a and 3a continues even when the operating rod 7 is pushed to the rightmost end and stopped, as shown in FIG.

Further, when the operating rod 7 is pushed in, the E IJ ring 7a presses and compresses the spring 8.

When the eject lever 10 returns to its original position, the operating rod 7 returns to its original position by the force of the spring 8, but at this time, the friction member 6 that is in contact with the side surface is moved together with the operating rod 7, and the contact 2a and 3a are separated, the muting switch 9 for the audio reproduction device is broken, and the muting circuit becomes inactive.

The friction member 6 needs to be stably held in place by friction with the side surface of the operating rod 7 even if its position is changed by the movement of the operating rod 7.

For this purpose, it is advantageous for the friction member 6 to be brought into spring contact with the surface of the operating rod 7.

FIG. 6 shows an embodiment in which the friction member is brought into contact with the surface of the operating rod via a spring.
6B is a structure in which a curved spring portion 2b is provided between the friction member 6 and the tip of the contactor 2, and FIG.
The tip of the friction member bundle spring portion 6a is curved.

FIG. 7 shows yet another embodiment of the frictional engagement between the operating rod and the 7-reaction member.

That is, the friction member 6b is made of a slightly flexible synthetic resin such as vinyl resin or polyethylene resin.

The friction member 6b is formed into a cylindrical shape, and the operating rod 7 passes through its inner hole, so that the operating rod 7 and the friction member 7 are frictionally engaged.

A recess 60a is provided on the side of the friction member, into which the tip of the contactor 2 is fitted.

When the operating rod 7 is pressed in the direction of the arrow from the state shown in FIG.
The friction member 60 moves with the movement of the operating rod 7 and comes into contact with the arm 1e of the frame member 1.

During this time, the contactor 2 is also bent by the friction member 60, and the contacts 2a and 3a are brought into contact.

When the operating rod 7 is continuously pressed, the operating rod 7 slides through the inner hole of the 7-reaction member 60 and moves to the left in FIG. 7, during which the spring 8 is compressed.

When the pressing of the operating rod 7 is stopped, the operating rod 7 returns to the position shown in FIG. 7 by the restoring force of the spring 8.

At this time, the friction member 60 also has the opposite arm 1f.
Move until it touches.

Therefore, contacts 2a and 3a break.

As explained in detail above, the present invention provides frictional engagement between the contact that makes or breaks the contact and the operating rod that interlocks with the eject lever, so that after the contact makes or breaks, the operating rod further Even when moving, no excessive force is applied to the contact, and only the operating rod slides.

Therefore, the stroke of the operating rod can be made as large as desired, regardless of the stroke at which the two contact points make or break.

Therefore, unlike conventional muting switches, it is not necessary to install the muting switch in the sound reproduction device without accurate alignment, and it can be installed in an appropriate space near the eject lever without accurate alignment.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, FIGS. 2 and 3 are perspective views showing a muting switch according to the present invention arranged near the eject lever, and FIGS. 4 and 5 The figure is a front view to explain the operation, Figure 6 A and B
7 is a partial front view showing different embodiments of the friction member, and FIG. 7 is a front view showing another embodiment. In the figure, 1 is a frame member, 1a is a hole, 1C and 1d are protrusions 2
and 3 are contacts, 2a and 3a are contacts, 4 and 5 are terminals, 6 and 60 are friction members, 7 is an operating rod, 8 is a spring, 9 is a muting switch, and 10 is an eject lever.

Claims (1)

[Scope of utility model registration request] In the □neeting switch that is linked to the eject lever that ejects the tape cassette of the audio playback device,
The contact has a contact that moves the contact over a limited stroke length to make or break a circuit, and an actuation rod that has a stroke length larger than the stroke length of the contact and is interlocked with an eject lever. A muting switch characterized by frictionally engaging an actuating rod.