JPS6034115Y2 - Detection switch device for cassette tape recorder - Google Patents

Description

[Detailed description of the invention] This invention relates to the operating mechanism of a detection switch such as a cassette tape recorder's error recording prevention switch or a chrome tape automatic detection switch. It is an object of the present invention to provide the above-mentioned detection switch device, which is in a non-engaging position with respect to the cassette in an operating state and performs a detection operation only in an operating state such as recording or playback.

Conventionally, cassette tape recorders, especially electronically operated cassette tape recorders, have a switch that detects whether or not recording is possible (preventing erroneous recording) by the presence or absence of a claw on the cassette end surface, or a chrome tape (
It is equipped with a switch that detects whether the tape is a chrome tape or a metal tape (chrome tape automatic detection).

FIG. 1 is a side view of a conventional detection switch device, in which 1 is a detection switch attached to a switch holder 2. As shown in FIG.

A switch actuator 3 is rotatably supported by a shaft 4 on the switch holder 2, and biased by a torsion spring 5 in the switch actuation direction (counterclockwise).

This Figure 1 shows the case where the cassette 6 is installed, and the protrusion 3a on the left end of the switch actuator 3 enters the detection hole 6a of the cassette 6 and activates the detection switch 1, making recording impossible. , or it electrically detects that it is chrome tape.

On the right side of the mechanism base 7 in FIG.
If necessary, the switch actuator 3 can be restrained in a position where it does not engage with the cassette 6.

FIG. 2 is a side view of the switch actuator 3 in the locked position, and 10 is an eject button, which holds the cassette 6 when the eject button 10 is pressed in the direction of arrow A as shown in FIG. At the same time, the actuator control plate 9 is rotated counterclockwise to a position where the switch actuator 3 does not engage with the cassette 6 and the detection switch 1 is inactive. Rotate.

Therefore, the cassette 6 is ejected in the direction of arrow B, and furthermore, the actuator control plate 9 is locked at the rotational position shown in FIG. 2 even after the eject button is pressed.

That is, in the conventional detection switch device, the switch actuator 3 is unrestricted when the cassette 6 is installed, but the switch actuator 3 is in the restricted position during the ejecting or installing operation of the cassette 6. Interlocking mechanisms are used to perform related operations, but since these are not directly related to the gist of this invention, detailed explanations will be omitted.

However, in the above-mentioned conventional device, there is a problem in the timing of each operation. For example, in the eject operation, the unlocking of the cassette holder (not shown) and the locking of the actuator control plate 9 must be performed at the same timing. Furthermore, in the cassette mounting operation, the cassette holder must be locked and the actuator control plate 9 must be unlocked at the same timing.

Therefore, if this timing is incorrect in the former case, the ejecting operation of the cassette 6 may be blocked by the switch actuator 3, and if this timing is incorrect in the latter case, the cassette 6 may not be placed in the correct position. Nevertheless, there have been problems such as the detection switch 1 not operating because the switch actuator 3 remains restrained.

This invention improves the drawbacks of the above-mentioned conventional example, and FIG. 3 is a side view of one embodiment of the invention, showing a case where the cassette tape recorder is in a non-operating state.

In this Figure 3, 11 is a switch actuator,
Shaft 4 on switch holder 12 holding detection switch 1
is rotatably supported by the torsion spring 1.
3 in the clockwise direction (the non-operating direction of the detection switch 1).

Reference numeral 14 denotes a solenoid lever, which is rotatably supported by a shaft 15 on the switch holder 12. A leaf spring 16 is fixed to the left end of the solenoid lever, and a drive source provided on the back side of the mechanism base 7 is connected to the right end of the solenoid lever. The plunger 18 of the solenoid 17 is connected by a pin 19.

The solenoid lever 14 is urged counterclockwise by the spring 20, and in the state shown in FIG. The detection switch 1 does not operate, and the protrusion 11a at the left end of the switch actuator 11 in FIG. 3 does not interfere with the ejecting or mounting operation of the cassette 6.

The solenoid lever 14 and the leaf spring 16 fixed thereto
constitutes an interlocking member interposed between the switch actuator 11 and the solenoid 17 serving as the drive source.

Next, FIG. 4 is a side view of the embodiment when the cassette tape recorder is in an operating state, in which the solenoid 17 is energized, the solenoid lever 14 rotates clockwise, and the leaf spring 1
6, the lower end 11b of the switch actuator 11 in the figure is pressed, and the detection switch 1 is activated (if the cassette has the detection hole 6a).

By the way, the solenoid 17 is not newly provided for operating the detection switch 1, but is an existing solenoid that is energized when the cassette tape recorder is operated.

That is, an electronically operated cassette tape recorder is equipped with a solenoid for separating the brake device from the reel desk (none of which are shown) during recording, playback, fast forwarding, and rewinding states, and also includes a solenoid for separating the brake device from the reel desk (none of which are shown) during recording, playback, fast forwarding, and rewinding states. It also has a solenoid for moving the slide base on which recording and playback heads are mounted.
Any of these solenoids can be used in common to operate the detection switch.

In addition, in this embodiment, only ■ detection switches 1 are shown, but it is also possible to operate two detection switches for preventing accidental erasure and for automatically detecting chrome tape, etc. In this case, By providing two leaf springs 16 on the communication member 21 of the solenoid lever 14, the two detection switches 1 can be actuated simultaneously by the same solenoid 17 by the respective switch actuators 11.

The detection switch of this invention is not limited to the above, but can be applied to any detection switch that automatically detects specific contents of a cassette depending on the presence or absence of a detection hole in the cassette. There are also devices that operate using a control gear or the like that is decelerated by a motor as a drive source instead of using a solenoid, and the detection switch device of this invention can also be operated using such a drive source.

As described above, in this invention, during recording or playback operations that require detection operations by the detection switch, the detection switch is actuated by a drive source such as a Tsuremaid that is energized in response to these operations. When loading or ejecting a cassette, the switch actuator is always in the retracted position and does not interfere with the loading or unloading operation of the cassette, and the detection switch does not work when the switch actuator is locked while the cassette tape recorder is in operation. There will be no more accidents like this.

In addition, the eject button of the cassette tape recorder does not cause the switch actuator to be retracted.
There is also the advantage that the pressing force is reduced.

[Brief explanation of the drawing]

Fig. 1 is a side view of a conventional detection switch device, Fig. 2 is a side view of the conventional detection switch device when the switch actuator is restrained, and Fig. 3 is a non-operating state of the detection switch device of this invention. FIG. 4 is a side view of the detection switch device of this invention in an operating state. 1...detection switch, 6...cassette, 6a...detection hole, 7...mechanism base, 11...switch actuator, 12・
... Switch holder, 13 ... Torsional respring, 14 ... Solenoid lever, 16 ...
...Plate spring, 17...Solenoid, 18...
... Plunger, 20... Spring.

Claims (1)

[Scope of utility model registration request] In a cassette tape recorder that is electrically operated and equipped with a drive source such as a Tsuremaid that is energized during recording or playback, this detection is performed using a detection switch for detecting specific contents of the cassette and the presence or absence of a detection hole on the cassette. It consists of a rotatable switch actuator that opens and closes the switch, and an interlocking member interposed between the switch actuator and the drive source, and when the cassette tape recorder is in a non-operating state, the switch actuator is in a non-engaging position with respect to the cassette. However, when performing recording or playback operations, the switch actuator is engaged with the cassette via the interlocking member by energizing the driving source such as the solenoid, and the detection switch is activated depending on the presence or absence of the detection hole in the cassette. A detection switch device for a cassette tape recorder configured to open and close.