JPS62164251A - Auto-stop inspection device for cassette tape recorder - Google Patents

Abstract

PURPOSE:To quickly and accurately measure the acting position of an auto-stop layer with no visual recognition by fixing an optical fiber sensor to a uniaxial table of a dummy cassette and also displacement sensor to the cassette respectively. CONSTITUTION:An optical displacement sensor 15 is fixed to a uniaxial table 2 of a dummy cassette 1 to detect the contact state between an auto-stop lever and a touch pin 7. While an optical displacement sensor 15 is attached to the cassette 1 to detect the displacement of the table 2. The cassette 1 is loaded into a radio cassette and a micrometer head 3 is pushed and the sensor 9 detects the contact and non-contact states secured between the auto-stop lever and the pin 7 before and after the auto-stop lever works. This contact state is sent to a personal computer. The personal computer stores the distance between the sensor 15 and a shielding plate 3. Thus it is possible to automatically and accurately measure the acting position of the stop lever with no visual recognition.

Description

[Detailed Description of the Invention] <Industry> 2 Field of Application> This invention is applicable to, for example, a radio cassette tape recorder (
The present invention relates to an auto-stop inspection device that detects the operating position of an auto-stop lever in a cassette tape recorder such as a radio-cassette player (hereinafter referred to as a radio-cassette player).

<Prior Art> As is well known, the auto-stop mechanism of a radio-cassette player operates an auto-stop lever using tape tension to bring the device to a halt when the running tape reaches its end.

Conventionally, the operating position of an auto-stop lever of an auto-stop mechanism has been measured as shown in FIG. In other words, a reference line 22 is drawn on a dummy cassette 21 having the same external shape as that of a cassette tape, and the amount of displacement of the sensor chip 24 of the auto-stop lever 23 is visually observed when the auto-stop lever 23 is operated. They inspected it and judged whether it was good or bad.

However, in the conventional position measuring method described in item 1, the position of the fast-moving auto-stop lever is visually detected, resulting in large measurement errors and variations depending on the measurer. Another problem is that measurement takes time.

<Objective of the Invention> Therefore, an object of the present invention is to enable the operating position of an auto-stop lever to be automatically, accurately and quickly measured without visual inspection.

<Structure of the Invention> In order to achieve the object stated in 1., the auto-stop inspection device of the present invention provides a dummy cassette with a table having a contact portion that contacts the sensor chip of the auto-stop lever so as to be movable back and forth, and a sensor chip as described in 2. and”1
The present invention is characterized in that an optical fiber sensor for detecting contact or non-contact with the contact portion is fixed to the table, and a displacement sensor for detecting displacement of the table is fixed to a dummy cassette.

<Operation> Attach the dummy cassette to the cassette tape recorder, move the table forward, and bring the contact part into contact with the sensor chip of the auto-stop lever. Then, the optical fiber sensor detects the contact between the contact part and the sensor chip, sends a detection signal to a personal computer etc. via a photoelectric converter, and sends a signal representing the position of the table from the displacement sensor to the personal computer. Take it into a coater etc. Further, when the table is moved forward, the contact part (Autos) and the sensor chip of the tube lever are moved backward, and the Autos I tube lever engages with an auto stop gear, for example, and moves automatically, and the contact part is in a non-contact state with the sensor chip. Become. An optical fiber sensor detects this moment and sends a detection signal to a personal combination coater, etc., and a personal computer, etc. takes in a signal representing the position of the table at this moment from an optical displacement sensor and stores it in its own memory.

In this way, the optical fiber sensor detects non-contact between the contact part and the touch pin, and the displacement sensor automatically measures the table position at this moment, that is, the distance traveled until the auto stop lever is activated. Detected accurately and quickly.

<Example> Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

In FIG. 1, numeral 1 is a dummy cassette having approximately the same external shape as a cassette tape, and numeral 2 is a uniaxial table provided on the dummy cassette 1 so as to be movable laterally. The -axis table 2 is moved back and forth in the lateral direction by rotating the micrometer head 3. An L-shaped angle 6 is fixed to the front surface of the sensor mounting plate 5 fixed to the upper surface of the above-mentioned axis table 2, and a touch pin 7, which is a contact part, is protruded from the lower end of this angle 6 in the direction of movement of the uniaxial table 2. It is fixed. On the other hand, an L-shaped fiber mounting bracket 8 is fixed to the upper surface of the sensor mounting plate 5 so as to protrude to one side of the uniaxial table 2.
An optical fiber sensor 9 is fixed to the lower end of the. The tip 9a of the optical fiber sensor 9 is bent and positioned in the recess Ia of the dummy cassette I, and the end surface of the tip 9a of the optical fiber sensor 9 is opposed to the substantially side surface of the touch pin 7 as shown in FIG. It is possible to detect contact or non-contact of the sensor chip 24 shown in FIG. Further, a shielding plate mounting bracket I2 protrudes from the sensor mounting plate 5=4- to the other side of the -axis table 2, and a shielding plate 13 having a reflective effect is attached to the tip of this shielding plate mounting bracket I2. It is fixed in a direction perpendicular to the direction of movement.

In addition, the sensor mounting bracket 16 is attached to the dummy cassette controller.
is fixed, and an optical displacement sensor 15 is attached to this sensor mounting bracket I6''. This optical displacement sensor I5 has a light emitting element 15a facing the shielding plate 13 in a diagonal direction at a constant inclination angle, and a light receiving element 15b facing the shielding plate 13 in a direction perpendicular to the latter. Therefore, in the optical displacement sensor 15, the position at which the light receiving element 15b receives light from the light emitting element 15a changes depending on the position of the shielding plate 13, and thereby the distance between the shielding plate I3 and the optical displacement sensor 15 changes. It is now detectable.

The auto-stop inspection device having the above configuration is used in the following manner.

First, dummy cassette I is installed in the radio cassette player in exactly the same way as a cassette tape. Next, the micrometer head 3 is rotated to advance the uniaxial table 2, the optical fiber sensor 9 and the shield plate 13 are advanced, and the touch pin 7 is brought into contact with the sensor chip 24 of the auto-stop lever 23. Then, since the tip 9a of the optical fiber sensor 9 faces substantially the side surface of the sensor chip 24 and the touch pin 7, the touch pin 7 and the sensor chip 7
4 is detected, and this detection signal is sent to the personal computer via a photoelectric converter (not shown). Upon receiving this detection signal, the personal computer detects the shielding plate 13 and the optical displacement sensor 1 from the optical displacement sensor I5.
A signal representing the distance to 5 is captured and stored.

Furthermore, the micrometer head 3 is turned to advance the -axis table 2, and the touch pin 7 presses the sensor chip 24 of the auto-stop lever 23 to move it backward. Then, when the auto-stop lever 23 moves a certain distance, it engages with an auto-stop gear (not shown) of the auto-stop mechanism, and the auto-stop lever 23 automatically retreats.
The sensor chip 24 of the auto-stop lever 23 and the touch pin 7 are separated, and the auto-stop mechanism is activated to cancel the tape playback state. The optical fiber sensor 9 detects the moment when this auto-stop mechanism operates and the touch pin 7 and the sensor chip 24 are separated, and sends this detection signal to the personal computer, and the personal computer detects the optical displacement sensor 15 and the shielding plate I at this moment.
3. The signal is taken from the optical displacement sensor 15 and stored.

Therefore, in the personal computer, the time between the moment when the touch pin 7 and the sensor chip 24 come into contact with each other and the moment when the single-axis table 2 moves forward, the auto-stop lever 23 automatically retreats, and the sensor chip 24 and the touch pin 7 separate. The moving distance of the uniaxial table 2 is detected.

In this way, the optical fiber sensor 9 detects the position at the moment when the touch pin 7 and the sensor chip 24 come into contact, while the auto stop lever 23 operates to detect the position at the moment when the sensor chip 24 and the touch pin 7 are separated. Therefore, the operating position of the auto-stop lever can be automatically measured accurately and quickly without any variation.

<Effects of the Invention> As is clear from the above, the auto-stop inspection device of the present invention is equipped with an optical fiber sensor and a displacement sensor that move together with a uniaxial table attached to a dummy cassette so as to be able to move forward and backward, so that the auto-stop inspection device can control the operation of the auto-stop lever. The position can be measured accurately and quickly without any visual inspection. Furthermore, in the auto-stop inspection device of the present invention, since the dummy cassette has approximately the same external shape as the cassette tape, even if the model or structure of the cassette tape recorder is different, as long as the position of the auto-stop lever does not change, the dummy cassette can be used. be able to.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an auto-stop inspection device in a cassette tape recorder according to an embodiment of the present invention, and FIG. 2 is a plan view showing a conventional method for measuring the operating position of an auto-stop lever. l...Dummy cassette, 2...-axis table, 7.
・Touch pin, 9...Optical fiber sensor, 13・
・・Shielding plate, I5 ・・Optical displacement sensor, 23・・
・Auto stop lever, 24・sensor chip.

Claims (1)

[Claims] (1) A table having a contact portion that contacts the sensor chip of the auto-stop lever is provided on the dummy cassette so that it can move forward and backward, and an optical fiber sensor that detects contact or non-contact between the sensor chip and the contact portion is fixed to the table. On the other hand, an auto-stop inspection device for a cassette tape recorder, characterized in that a displacement sensor for detecting displacement of the table is fixed to a dummy cassette.