JPH0127139Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a detection device, particularly a device for detecting REC holes and tape type discrimination holes of a cassette tape in a cassette tape recorder.

As is well known, if the recording tab of a normal cassette tape is accidentally broken after recording, the hole will become a hole.
Check whether a cassette tape recorder has a lever hole or not.
For example, it is detected by a switch, and if there is a hole, recording is not possible.

Further, in order to automatically switch the recording or playback characteristics depending on the type of cassette tape, a hole indicating the type is provided in the cassette, and the presence or absence of this hole is similarly detected by a switch or the like.

As described above, the conventional detection device of this type using a switch is designed to determine the presence or absence of a hole in a cassette half by bringing the switch or a lever linked thereto into contact with the position of the hole in the cassette half.

However, since there is a tolerance in the size of the cassette half and the size varies within that tolerance, in order to detect the above-mentioned hole on the top surface of the cassette half, the configuration of the conventional device is such that when the switch or lever is inserted into the hole. There is a problem where you have to adjust the switch so that it turns on.

The present invention has been made to improve the problems of the prior art, and includes a member for detecting the upper surface of the cassette half, and a switch for detecting the hole on the upper surface of the cassette half is interlocked with the member, thereby detecting the cassette half. It is characterized in that it is configured to operate with the upper surface of the half as a reference surface.

The present invention will be described below with reference to the embodiments shown in the drawings. In FIG. 1, reference numeral 1 indicates a support column fixed at a predetermined location in a cassette tape recorder; 2, a rigid plate rotatable about the support support 1;
3, 4 and 5 were mounted on plate 2, respectively.
This is a switch for REC detection, chrome tape detection, and metal tape detection.

When a cassette is inserted into a tape recorder, the rigid plate 2 rotates freely around the support 1, so that the claws a of the plate 2 are attached to the cassette half 6.
It is detected by coming into contact with the top surface of the At this time, each of the detection switches 3, 4, and 5 operates in conjunction with the rotation of the rigid plate 2, and is fitted into each hole in the upper surface of the cassette half 6.

In this case, the size of the cassette half 6,
Alternatively, even if the positions vary, the claw a always detects the top surface of the cassette half 6, so there is no change in the relative position of each detection switch interlocked with this and the claw a, and the detection switch always detects the upper surface of the cassette half 6. Operates using the top surface as a reference surface. Therefore, if the relative positional relationship is determined in advance, the troublesome adjustment work as in the prior art described above is unnecessary.

FIG. 2 shows another embodiment of the present invention, in which each switch 3, 4, 5 is provided with a cassette half upper surface detection claw 7 instead of the rigid plate. 8 is a hole detection claw, and 9 is a contact point. When the hole detection pawl 8 fits into the hole while the detection pawl 7 is in contact with the upper surface of the cassette half, the contact 9 closes and the hole is detected.

In this embodiment, each switch is provided with a detection claw 7, so that it can be mounted relatively freely in a predetermined position on the tape recorder.

As explained above, according to the present invention, when operating the hole detection switch of the cassette half, the detection switch is operated by using the upper surface of the cassette half as a reference surface to compensate for variations in the size of the cassette half and variations in its position. This eliminates the need for adjustment work during installation.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of the present invention;
FIG. 2 is a schematic diagram showing another embodiment of the present invention. 1...Strut, 2...Rigid plate, 3, 4, 5
...hole detection switch.

Claims (1)

[Claims for Utility Model Registration] (1) A device is provided with a member for detecting the upper surface of the cassette half, and a switch for detecting the hole on the upper surface of the cassette half is linked to the member to operate with the upper surface of the cassette half as a reference plane. A detection device characterized in that it is configured to. (2) The detection device according to claim 1, wherein the member is a rotatable rigid plate, and the switch is provided on the plate. (3) The detection device according to claim 1, wherein the member is a cassette half upper surface detection claw and is provided on the switch.