JPS6131395Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a recording/playback switching device for a tape recorder.

A conventional recording/playback switching device in a tape recorder engages a switch operation member fixed to a recording operation lever made of sheet metal with an actuating part of a recording/playback switch, and switches the switch according to the operation of the recording operation lever. The switch is being changed. in this case,
The recording button attached to the recording control lever has a
Since the force applied during the switching operation of the changeover switch is applied almost as is, a large operating force is required. In addition, if a plate spring or the like is used as the switch operation member, it is troublesome to attach it to the recording operation lever, and if it is screwed, the screw will loosen with long-term use, so a resin-molded recording operation lever is used. In some cases, there are drawbacks such as the attachment point of the switch operating member being easily damaged.

The present invention was developed to eliminate these conventional drawbacks; it has a structure that has a small number of parts and is easy to assemble, requires light operating force during recording operations, and is not prone to breakage after long-term use. To provide a recording/playback switching device which does not cause any problems and can reduce costs by using a resin molded part for a recording operation lever.

That is, according to the recording/playback switching device according to the present invention, the coil part expands both arms of the torsion coil spring rotatably supported by the supporting part of the board, and the recording/playback switching device fixed to the board is switched. It is characterized in that it is arranged so as to sandwich the operating part of the lever and a protrusion formed on the recording operation lever that moves back and forth.

FIG. 1 shows a tape recorder 1 for microcassettes to which the present invention is applied, and is a schematic plan view with the bottom plate (or partition plate) removed of a cassette storage section into which a microcassette 2 is installed.
In FIG. 1, a magnetic head 3 for recording and playback is shown.
and the slide chassis 5 to which the pinch roller 4 is attached and fixed, press the arrow A of the playback button 6 or the recording button 7.
It moves in the same arrow A direction in response to the pressing operation in the direction. At this time, the magnetic head 3 comes into contact with the magnetic tape of the microcassette 2, and the pinch roller 4 presses the magnetic tape onto the capstan shaft 8, and the rotation of the capstan shaft 8 drives the magnetic tape to run. . Furthermore, when the recording button 7 is pressed in the direction of arrow A, the erasing head 9 also comes into contact with the magnetic tape. These play button 6 and record button 7 are locked by pressing in the direction of arrow A, and then by pressing the stop button 10 in the direction of arrow A.
The above-mentioned lock is released and the system enters a stopped state. The torsion coil spring 11 returns the recording operation lever 12 connected to the slide chassis 5 and the recording button 7. Further, the supply reel shaft 13 is fixed to a rotating shaft 16 rotatably mounted on a reel shaft support lever 15 that rotates about a shaft 14, and the take-up reel shaft 17 is fixed to a base plate of a tape recorder or the like. It is rotatably attached to a fixed rotating shaft 18.

Next, a specific example of the configuration of the recording/playback switching device, which is the main part of the present invention, will be explained.

That is, in FIG. 1, the torsion coil spring 1
The support pin 21 that supports one coil part is connected to the other one.
The coil portions of the torsion coil springs 22 are rotatably supported. This is a state in which the arms 22a and 22b of the torsion coil spring 22 shown in FIG. 22a,2
2b, the direction opposite to the arrow, that is, the third
A restoring force is acting in the direction of arrows Pa and Pb in the figure. Both arms of the torsion coil spring 22 with both ends expanded in this way connect the actuation part 24 of the recording/playback switch 23 fixed to the board of the tape recorder, etc., and the protrusion 25 formed on the recording operation lever 12. They are arranged in such a way that they sandwich each other.

Here, in FIG. 3, the recording operation lever 12 is pointed at arrow A.
This shows a state in which no pressing operation is performed in the direction, that is, a state in which a mode other than the recording mode is selected. At this time, as is clear from Figure 3,
Of the arms 22a and 22b of the torsion coil spring 22, for example, one arm 22a is positionally regulated by the actuating portion 24, and the other arm 22b is regulated in position by the protrusion 25. Further, the distance Y from the center of the support pin 21 to the contact point between the torsion coil spring 22 and the protrusion 25 is longer than the distance X from the center of the support pin 21 to the contact point between the torsion coil spring 22 and the actuating part 24, that is, from the support pin 21 to the contact point between the torsion coil spring 22 and the protrusion 25. The protrusion 25 is located outside the operating portion 24.

In this state shown in Fig. 3, the recording operation lever 1
2 is pressed and moved in the direction of arrow A, the protrusion 25 contacts and presses the arm portion 22a of the torsion coil spring 22, so the torsion coil spring 22 itself rotates counterclockwise around the support pin 21. As the torsion coil spring 22 moves, the arm portion 22b comes into contact with the actuating portion 24 and presses it due to the return force in the direction of the arrows Pa and Pb, which causes the torsion coil spring 22 to close.
Therefore, when the recording operation lever 12 is moved in the direction of arrow A and is locked, the actuating section 24 of the recording/playback switch 23 does not perform the switching operation by moving in the direction of arrow A, as shown in FIG. 4, for example. The arm portion 22a of the torsion coil spring 22 is in contact with the protrusion 25, and the arm portion 22b is in contact with the actuating portion 24, and remains stationary.

In such an operation, the recording operation lever 1
The forces acting on the protrusion 25 of 2 and the actuating portion 24 of the recording/playback switch 23 are all applied through the return force of the torsion coil spring 22, and the torsion coil spring 22 itself is rotatable around the support pin 21. Therefore, there is no fixed part like in the past, so there is no damage even during long-term use or when strong acting force is applied. Therefore, it is possible to use a synthetic resin molded part such as plastic as the recording operation lever 12, and a complicated shape can be easily obtained, and costs can be reduced. Furthermore, each part only needs to be attached and does not need to be fixed, so assembly is easy. Furthermore, the protrusion 25 of the recording operation lever 12
Since the switch operating force applied to the recording/playback changeover switch 23 is only X/Y of the operating force of the operating portion 24 of the recording/playback changeover switch 23, the force required to operate the recording operation lever 12 is reduced, and the operability is improved.

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without departing from the gist of the present invention.

[Brief explanation of the drawing]

Fig. 1 is a plan view schematically showing the entire tape recorder used to explain the present invention, Fig. 2 is a perspective view showing the expansion of the torsion coil spring, and Figs. 3 and 4 are the tape recorder according to the present invention. FIG. 3 is a plan view showing main parts of an embodiment in the order of operation. 12... Recording operation lever, 21... Support pin,
22...Torsion coil spring, 22a, 22b...Arm portion, 23...Record/playback selector switch, 24...Actuation part, 25...Protrusion.

Claims (1)

[Scope of utility model registration request] The coil part is formed into a recording operation lever that is moved back and forth with the operating part of the recording/playback switch fixed to the board by expanding both arms of a torsion coil spring rotatably supported by the support part of the board. A recording/playback switching device characterized in that the recording/playback switching device is arranged so as to sandwich the protrusion.