JPS6055903B2 - Cassette tape recorder cassette misinsertion prevention device - Google Patents

Description

[Detailed Description of the Invention] The present invention is a tape recorder that automatically attaches a cassette to a tape recorder body using motor power, sets the recording/playback state, and furthermore automatically attempts to escape from the tape recorder body. The invention relates to prevention of erroneous insertion of cassettes.

Conventionally, when manually inserting a cassette from the insertion slot, attaching it to the tape recorder body, setting it to recording and playback mode, and ejecting it from the tape recorder body, the spring pressure charged when the cassette was inserted was used. Then there are various types of tape recorders, such as car stereo cassette decks.

There are two types of cassette insertion methods in the above-mentioned type of tape recorder: one in which the cassette is inserted in the direction of arrow A shown in FIG. 1, and the other in the direction of arrow B. In the former case, the cassette insertion opening is wide and the cassette is symmetrical, so the cassette can be inserted in any direction, making it difficult to prevent incorrect insertion of the cassette. In the latter case, since the cassette insertion opening is narrow and the cassette is not symmetrical, it is easy to limit the insertion of the cassette to only the set direction. In particular, the present invention aims to prevent erroneous insertion of a cassette into a cassette tape recorder which uses a cassette insertion format in the direction of arrow A shown in the former section, and in which the cassette is automatically loaded into or removed from the main body of the tape j recorder using a motor drive. be. If the cassette is inserted in the B-C5 or D direction and the cassette is inserted in the B-C5 or D direction, the cassette detection mechanism is activated,
If the cassette is transferred or loaded automatically, the cassette will be pressed against the reel shaft or capstan shaft of the tape recorder main body, which will not only cause deformation and damage to the cassette, but also cause damage to the tape recorder or performance deterioration. Become. Furthermore, this can lead to deformation or damage to the mechanism for automatically loading or unloading the cassette, making it difficult to remove the cassette, resulting in a fatal defect. The present invention eliminates the above-mentioned drawbacks and will be described below with reference to the drawings shown as examples.

In FIGS. 2, 3, and 4, reference numeral 1 denotes a front panel of a tape recorder, which has an insertion opening 2 in the center. 3
, 3'' are a pair of attachment parts provided on both sides, and the insertion opening 2
Openings 4, 4'' are provided on the opposite side, and positioning plates 5, 5'' are provided on the opposite side, respectively.

6, 6″ and 7, 7″ are pins, respectively attached to the mounting portion 3.
, 3'', and are slidably inserted through long grooves 9, 9'' and 10, 1'' provided in the side plates 8, 8'', respectively.

Reference numeral 11 denotes a transfer section which is provided in a bridging manner on a sliding plate provided parallel to the side plate and rotatably supported by a pin, and has a claw 12 on the side facing the insertion opening 2, and has a claw 12 on the opposite side. There is a locking plate 13
have.

A protrusion 14 is fixed to the center of the locking plate 13, and is provided at a position corresponding to an opening 32 into which a recording/playback head of the cassette is inserted. Furthermore, a notch 15 is provided at the top of the projection 14.
is provided, and both ends of this transfer portion are bent downward to provide fulcrum holes 15, 15''. The fulcrum holes are connected to pins 16, 1'' fixed to the sliding plate 18, 1''. Each of the transfer parts 11 is rotatably supported through the pins.Furthermore, the transfer part 11 is biased clockwise by a screw spring 17 about the pins 16, 16'' as fulcrums. The upper end surfaces of the side plates 8, 8'' have concave parallel steps as shown in FIG.
Cams 19, 19'' are formed by connecting these steps with a smooth slope, and are configured to control rotational movement in accordance with the sliding movement of the transfer section 511. 20 is parallel to the transfer section 11. A detection lever is provided in the form of a bridge on the sliding plate 18, 1, and a detection piece 21 is provided in the center, and fulcrum holes 23, 23'' are provided in bent portions 22, 22'' at both ends. 4.

A fulcrum pin 24, 24'' fixed to the sliding plate 18, 1'' is rotatably supported through the fulcrum hole 23, 23''. The detection lever 20 is urged clockwise by a torsion spring 25, and the detection piece 21
1, and protrudes to the same extent as the projection 14. On the other hand, the bent portion 22 has a protrusion 28 at a position facing a switch 27 fixed to the main plate 26. 29 is a cassette, 30 is a protrusion rear wall, 31,
3" is the front part, 32 is the opening where the recording and playback head enters, 3
3 indicates the front wall of the opening.

When a cassette is manually inserted from the cassette insertion slot 2 in the direction of arrow E shown in FIG. to go into.

At the same time, the detection piece 21 is pushed in the direction of arrow E by the front wall 33 of the opening, and the detection lever 20 swings counterclockwise about the pins 24, 24'' against the torsion spring 25.The above operation As a result, the protrusion 28 of the detection lever 20 presses the switch 27 and drives a motor (not shown). The motor drives the sliding plates 18, 1' in the direction of arrow E. The above operation causes the transfer section 11 to move toward the cam. 19, 19', the pawl 12 swings clockwise by the torsion spring 17 and engages with the rear wall 30 of the protrusion of the cassette.

Further, when the transfer section 11 moves in the direction of arrow E, the cassette is transferred and stored in the mounting sections 3, 3''.At this time, the detection lever 20 also moves in the direction of arrow E together with the sliding plate.
There is no obstacle to transporting the cassette. Said transfer section 1
1 moves in the direction of arrow F by motor drive, and mounts the cassette on the tape recorder main body (not shown). Next, as shown in FIG. 5, when the cassette is manually inserted from the cassette insertion slot 2 in the direction of arrow E in the direction C shown in FIG. come into contact with Therefore, the detection piece 21 cannot be pushed in the direction of arrow E, and the switch 27 cannot be turned on. Similarly, the switch 27 will not turn on when inserted in the B-D direction. As described above, the present invention has a simple structure and a small number of parts, and has the effect of reliably preventing erroneous insertion of a cassette.

Furthermore, since the inserted state is detected by the opening front wall 33 at the center of the cassette, even if the cassette is inserted diagonally, the switch 2
7 does not enter, there are many advantages such as the fact that the cassette is not transported without the claw 12 engaging with the rear wall 30 of the protruding portion of the cassette. Since the projections 14 of the cassette locking plate 13 come into contact with the magnetic tape stored in the cassette, it is preferable to select a material such as plastic that will not damage the magnetic tape.

[Brief explanation of the drawing]

Fig. 1 is a three-dimensional perspective view of the cassette, Fig. 2 is a plan view of the main parts of the device of the present invention shown as an embodiment, Fig. 3 is a side view of the main parts, and Fig. 4 is a cross section of the main parts showing the cassette inserted state. FIG. 5 is a sectional view of a main part showing a state in which a cassette is incorrectly inserted. 2... Insertion port, 3,3''... Mounting part, 11... Transfer part, 12... Claw, 13... Locking plate, 14... Protrusion, 18, 18''...・Sliding plate, 20... detection lever, 21... detection piece, 27... switch, 15...
Notch.

Claims (1)

[Claims] 1. A transfer section having a claw and a locking plate that engages with the rear wall of the protruding portion of the cassette is provided in a bridging manner on the sliding plate and is pivotally supported on a pin, and this transfer section is driven by a motor to transfer the cassette. The cassette is transferred to the mounting section, and the cassette is automatically mounted on or removed from the tape recorder main body by the mounting section, so that in the tape recorder, the central part of the locking plate provided in the transfer section corresponds to the opening of the cassette. The detection lever is provided with a protrusion and a notch at a position, and is parallel to the transfer part and provided in a bridge shape on the sliding plate, and has a detection piece that protrudes through the notch to the same extent as the protrusion of the transfer part. Provided with a cassette magnetic head,
When the cassette is inserted, the front face having a plurality of openings into which pinch rollers etc. are inserted and the locking plate face each other, and the front wall of the opening and the detection lever end are turned on to switch the motor drive when the cassette is retracted. When the cassette is inserted, the detection piece is brought into contact with the protrusion and the rear wall or side surface of the cassette is prevented from moving. A device for preventing incorrect insertion of a cassette in a cassette tape recorder.