JPH0313873Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a detection switch inspection device for automatically determining whether or not a cassette half detection switch in a cassette tape recorder operates normally.

Generally, a cassette tape deck is equipped with a detection switch to automatically detect the following contents.

Half detection to confirm that a cassette half is inserted.

Detection to check the presence or absence of a recording prevention tab.

Chrome detection to confirm that it is chrome tape.

Metal detection to confirm that it is a metal tape.

In order to check the operation of the detection switch as described above, it is necessary to use a cassette half 1 as shown in FIG. Considering the variation in dimensions in the direction of the arrow, it was necessary to check the operation of the detection switch for each type of cassette half, including the maximum and minimum dimensions, with and without recesses.

In addition, FIG. 1B is a top side view of the cassette half 1, and 2 is an erroneous erasure prevention recess, 3 is a chrome tape detection recess, and 4 is a metal tape detection recess.
However, 3 and 4 do not exist at the same time.

That is, conventionally, as shown in FIG.
The presence or absence of 3 and 4 is mechanically detected by the detection arm 5,
The signal was obtained by the operation of the detection switch 7. 6
is a coil spring.

However, due to the dimensional variations in the direction of the arrow of the cassette half 1 in Figure 1, it is necessary to replace the maximum and minimum dimensions with and without recesses, and to check and adjust the corresponding detection switches. It was hot.

The present invention is intended to correct the above-mentioned drawbacks, and its purpose is to provide a detection switch for a cassette tape recorder that can automatically check whether the detection switch is normal or not, regardless of variations in the cassette halves. The purpose is to provide inspection equipment.

In the figure, 8 is a movable piece, 9 is a coil spring, 10 is a bearing, 11 is a solenoid, 12 is a solenoid drive circuit, 13 is a comparison judgment circuit, and 14 is a display circuit.

That is, the movable piece 8 is provided in the detection recess so that it can take two positions: a position with the recess and a position without the recess.

The movable piece 8 can be electrically switched between the above two positions by a solenoid 11. Solenoid 11
is periodically turned on and off by the solenoid drive circuit 12.

Then, the output signal of the detection switch 7 and the solenoid drive signal are judged by the comparison judgment circuit 13, and when the two signals are different, the display circuit 14 judges NG, and when the two signals are the same, it judges OK.

As described above, the present invention uses a solenoid to operate the movable piece provided in the detection recess of the cassette half, and compares this operation signal with the detection signal from the detection switch to determine whether the detection switch is good or not. Since it can be displayed, it is possible to automate the inspection, and it has the effect that confirmation and adjustment can be performed with one cassette half regardless of the size variation of the cassette halves.

[Brief explanation of the drawing]

In FIG. 1, A is a plan view of the cassette half, FIG. 1B is a top view of the cassette half, and FIG. 2 is a sectional view showing a conventional detection method using the cassette half.
FIG. 3 is a block diagram of automatic inspection using a cassette half according to an embodiment of the present invention. 1...Cassette half, 5...Detection arm, 7
...Detection switch, 8...Movable piece.

Claims (1)

[Scope of Claim for Utility Model Registration] A movable piece 8 provided in the detection recesses 2, 3, and 4 of the cassette half 1; when energized, the movable piece is drawn into the detection recess and becomes in a state where the recess is present; And the solenoid 11 is in a state without a recess due to de-energization.
, a solenoid drive circuit 12 that controls the energization of the solenoid, a detection switch 7 that is provided on the cassette tape recorder side and whose contacts close when it detects the presence of a recess in the cassette half, and the solenoid drive circuit. and a comparison judgment circuit 13 that sends out an output when the detection switch is closed while the solenoid drive circuit is energized, and a display circuit that displays the output from the comparison judgment circuit 13. Features: Inspection device for detection switch of cassette tape recorder.