JPH07169234A - Tape cassette - Google Patents

Abstract

PURPOSE:To prevent a slider from falling out and to prevent entering of the dust and the like by respectively providing through guide grooves on a lower case and engaging pieces on the slider and inserting the engaging pieces for the support into the through guide grooves. CONSTITUTION:The through guide grooves provided with bearing parts 5 parallel to the sliding direction of the slider 3 are arranged on the lower case 2. The through guide grooves 4 are inserted to the internal surface of the slider 3, and also the engaging pieces 7 having bent parts 6 for preventing the fall-off which are supported on the bearing parts 5, are projectingly arranged. Thereby, the slider 3 becomes not to be disengaged in the state assembled in the lower case 2, then the improvement of the carrying performance at the time of assembling the tape cassette and the simplification on the handling procedure are attained. Further, the fall-off preventing mechanism between the slider 3 and the lower case 2 is covered with the slider 3, thereby the entering of the dust and the like is prevented, and the stable operation is performed.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to a magnetic tape cassette (DAT) suitable for use in recording digital signals, such as PCM signals.

[0002]

2. Description of the Related Art In a conventional tape cassette used in a PCM recording / reproducing apparatus, when a tape or a dust contained in a tape stored in a cassette case causes a dropout in a reproduction signal, this is a problem. For prevention, a slider that is slidable for protecting the tape and a lid that is rotated by sliding the slider to cover the front surface of the cassette are provided in the cassette case.

[0003]

This conventional tape cassette has a combination of an upper case and a lower case in terms of assembly and manufacture. As shown in FIG. 5, a slider b is assembled in a lower case a and then a tape is wound. Although the internal parts such as the hub are stored and the upper case is combined at the end, and the upper case is assembled to prevent the slider from coming off, the slider may be deformed during transportation or handling before assembly. Can easily come off, the slider can come off from the lower case, resulting in poor assembly, which can lead to problems in operation due to complicated conveyance and poor handling of the slider. It may be possible to provide a joint piece, but in this case, a slit is formed between the upper and lower cases due to the operation of the slider, and dust may enter through the slit. Often becomes abnormal, quality was also there is a problem that disappears reliability decreases.

The present invention is intended to eliminate these conventional drawbacks, prevents the slider from coming off, improves the assembling property of the slider, and the operation of the slider is accurate, and there is no intrusion of dust or the like, which is safe. It is an object of the present invention to provide a highly reliable tape cassette with a simple structure and at a low cost.

[0005]

According to the present invention, a pair of hubs each having a tape wound therein are rotatably provided in a cassette case composed of an upper case and a lower case, and cover a part of a bottom surface and a side surface of the lower case. In a tape cassette equipped with a slider that is slidably mounted, a penetrating guide groove having a supporting portion parallel to the sliding direction of the slider is provided in the lower case, and is inserted into the guide groove. In addition, an engagement piece supported by the support portion is provided so as to project from the inner surface of the slider.

[0006]

The slider slides in the front-rear direction of the cassette case, and the engagement piece protruding from the inner surface of the slider slides in the front-back direction in the through guide groove in the lower case. When the tape cassette is not used, the slider is in the front position and the lower surface of the tape running space is closed, and when the device is loaded, the slider is moved to the rear position and used in the open state. When assembling the slider in the lower case, push the engaging piece into the penetrating guide groove of the lower case while displacing it slightly inward, and return the engaging piece to the outside when it is fitted into the penetrating guide groove. If the slider is engaged with the bearing portion of the groove, the slider can be securely fixed without coming off, and the penetrating guide groove is covered by the slider to prevent dust from entering.

[0007]

1 to 5, the cassette case has a combined structure of an upper case 1 and a lower case 2, and the lower case 2 covers the bottom surface and the side surface of the cassette case. The lower case 2 is provided with a penetrating guide groove 4 parallel to the sliding direction of the slider 3, and a stepped support portion 5 is formed in the guide groove 4, and the guide groove 4 is formed. Fitted in groove 4 and bearing 5
An engaging piece 7 having a bent portion 6 for preventing slipping off is provided on the inner surface of the slider 3 so as to project therefrom.

In this case, the engaging piece 7 is an L-shaped projecting piece having a bent portion 6 or a hooked portion, and the bent portion 6 is projected outward on both sides, and the outer side of the bottom wall of the lower case. A pair of through guide grooves 4 are provided on the inner surface of the slider that faces the lower surface, and the engaging pieces 6 are inserted and provided as through through holes or cutouts within the sliding range of the slider 3 for engagement. Piece 7
The stepped support portion 5 for supporting the bent portion 6 is formed on the side wall of the penetrating elongated hole. The tip edge of the top surface of the bent portion 6 is
Chamfered inclined surface _61, and consideration is given to be easily pressed through the guide groove lower edge of the lower case 2 be deformed engagement piece 7 when embedded chamfered to penetrate the guide groove 4 of the lower case 2 ing.

Further, the slider 3 is provided with a rail-shaped projection 31 for mounting the upper edge of the side wall of the lower case 2 at the upper end of the side wall thereof to prevent the slider 3 from coming off. It is useful for Further, an engaging hole 10 is formed in the bottom surface of the slider 3, and the engaging hole 10 is fitted into the lower case 2 at a position corresponding to the engaging hole 10 with the slider 3 being opened and closed. A magnetic tape cassette having an elastic lock piece (11) having a head to be inserted and locked, in which a pair of hubs (12, 12) having a magnetic tape (13) wound in a cassette case are rotatably mounted and A hub brake 15 that engages and disengages with a lock gear 14 provided on a small diameter portion above the tape winding surface is slidably provided, and is rotatably fitted to the cassette case and covers the front surface of the cassette according to the rotation. A lid 9 is provided, and the hub brake 15 is detachably provided on the lid 9 so as to move.

In the figure, numeral 16 is a sheet, and numeral 17 is a transparent window portion fixed to the inner surface of the upper case. 18 is a tape guide rib, 19
Is a spring locking portion.

However, when storing the tape cassette,
The head of the elastic lock piece 11 is fitted into the engagement hole 10 of the slider 3, the slider 3 is locked, the lid 9 is also closed, and the magnetic tape 13 is hermetically sealed in the cassette case. In this case, in the storage state, the hub brake 15 is biased by the spring to be locked by the lock gear 14 of the hub 12, and the lid 9 is also closed so that the magnetic tape 13 is held properly. When the cassette case is automatically loaded into the cassette deck, the elastic lock piece 11 is gradually pushed up while the lock piece release convex portion on the cassette deck side is in contact with the head, and is released at the top position so that the slider 3 can slide. In this state, the lid 9 is also opened and the magnetic tape 13 is exposed and can be used.

[0012]

According to the present invention, a penetrating guide groove having a supporting portion parallel to the sliding direction of the slider is provided in the lower case, is fitted into the guide groove, and is supported by the supporting portion. By disposing the engaging piece protruding from the inner surface of the slider, it will not come off when the slider is assembled in the lower case, improving the transportability when assembling the tape cassette and simplifying handling. In addition, the amount of displacement due to bending deformation of the slider is smaller than that of the conventional example, and it is hard to come out, and the removal prevention mechanism interposed between the slider and the lower case is covered by the slider, and there is no intrusion of dust and the like. Since the quality does not deteriorate, the safety and reliability can be remarkably enhanced, and the slider can be kept tightly sealed in the case, ensuring smooth and light operation, ensuring good handling and stable operation. Obtained is practically the effect of such high safety.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention in a state where a slider is incorporated in a lower case.

FIG. 2 is a perspective view of the entire example of FIG. 1 in a separated state.

FIG. 3 is an enlarged vertical sectional view showing a state where a slider is incorporated in the lower case of the example of FIG.

FIG. 4 is an enlarged vertical sectional view of a part of FIG.

5 is an enlarged cutaway perspective view taken along line AA of FIG.

FIG. 6 is a perspective view of a lower case incorporating a slider of a conventional example.

[Explanation of symbols]

1 Upper case 2 Lower case 3 Slider 3 ₁ Projection 4 Penetration guide groove 5 Supporting part 6 Bending part 7 Locking piece 9 Lid 10 Engagement hole 11 Elastic locking piece 12 Hub 13 Tape 14 Lock gear 15 Hub brake

Claims (2)

[Claims] 1. A slider rotatably provided with a pair of hubs in which tapes are wound in a cassette case composed of an upper case and a lower case, and which is slidably mounted so as to cover a part of a bottom surface and a side surface of the lower case. In a tape cassette equipped with
A penetrating guide groove having a bearing portion parallel to the sliding direction of the slider is provided in the lower case, and an engagement piece fitted into the guide groove and supported by the bearing portion is provided in the slider. A tape cassette characterized by being installed on the inner surface so as to project. 2. The engaging piece is an L-shaped projecting piece having a bent portion in cross section, the through guide groove is provided as a through long hole within a sliding range of the slider, and a through long hole side wall. The tape cassette according to claim 1, wherein a support portion is formed as a stepped portion on the tape cassette.