JPS6087484A - Cassette - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cassette for storing tapes and the like.

Conventional structure and problems In recent years, magnetic recording using tape cassettes has tended to have higher performance and higher density, and it is necessary to prevent fingerprints from forming when the tape is exposed to the outside air or touched by fingers. has appeared. Therefore, it is conceivable to put a lid on the front opening of the cassette, and this has already been done for video cassettes and the like. If such a device is to be applied to an audio cassette, it is desired to have a simpler structure and be able to implement it at a lower cost.

The cassettes proposed by the inventors so far will be described below. FIG. 1 is a perspective view showing the opened and closed states of the cassette, with (&) showing the closed state and (b) showing the open state. FIG. 2 is a plan perspective view thereof, and FIG. 3 is a side view thereof.

In Figures 1 to 3, 1 is the cassette body, 2 is the opening on the front of the cassette, 3 is the cassette lid, and 4 is the cassette lid 3.
A rotation support shaft 6 provided in the cassette lid rotation support shaft 4 is a fitting hole for the cassette lid rotation support shaft 4, and is formed in a substantially triangular shape tapering toward the rear on the side surface of the cassette body 1. A shaft 6 is integrally formed with the cassette body 1 and holds a spring 7. The shaft 7 has its both ends in pressure contact with the rotating shaft 4, and is attached to the outside of the cassette body 1 and the inside of the lid body 3 by the holding shaft 6. 8 is a magnetic tape which urges the pivot shaft 4 held by the cassette and integrally formed with the lid 3 toward the rear of the cassette.

The operation of the cassette constructed as above will be explained. A force is constantly applied to the lid body 3 by a spring 7 through a pivot shaft 4 formed integrally to the rear of the cassette, and the pivot shaft 4 is connected to a fitting hole 6 formed in the cassette body 1. Rotate along.

In order to move the lid 3, the lid 3 moves moderately and reliably regardless of whether the cassette is opened or closed.

However, in the above configuration, since the spring 7 is placed outside the cassette body, it is impossible to completely cover and hide the spring 7 with the lid 3 due to ease of assembly, resulting in an unnatural appearance of the cassette. There were major difficulties in commercializing the product. Alternatively, even when placing the spring 7 inside the cassette body 1, it is impossible due to the mold structure to form the spring holding shaft 6 on the wall surface of the cassette body without affecting the appearance of the cassette body 1, and furthermore, the magnetic However, disadvantages remain, such as the magnetic surface of the tape being damaged by the spring 7 formed inside the cassette body 1.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned problems and aims to provide a case and a throat with a lid that are simple in structure and operate reliably.

Structure of the Invention The present invention includes a cassette body, a rod-shaped lid body for opening and closing an opening of the cassette body, a pair of pivot shafts provided on the side surfaces of the lid body, and a rotary support shaft provided in the cassette body and for rotating the pivot shaft. a pair of substantially triangular fitting holes into which the support shaft fits and which taper toward the rear;
biasing means for biasing the pivot shaft toward the rear of the cassette body;
This cassette is composed of a holder that is inside the cassette body and holds the biasing means, and the holder is placed inside the cassette body and inside the biasing means, without reducing the tape storage capacity. This is a book that uses a simple structure to create a cassette that works reliably.

DESCRIPTION OF EMBODIMENTS FIG. 4 is a front perspective view showing a closed state of a cassette lid according to an embodiment of the present invention, and FIG. 6 is a side perspective view.

In Figures 4 and 6, 1 is the cassette body, 2 is the opening on the front of the cassette, 3 is the cassette lid, and 4 is the cassette lid 3.
The rotation support shaft 6 provided on the side surface is a fitting hole for the cassette lid rotation support shaft 4, and is formed in the side surface of the cassette body 1 in a substantially triangular shape that tapers toward the rear. This is the same configuration as that explained in FIGS. 1 to 3. 16a, 1
6b is formed integrally with the spring support block 12, and the spring 1
It is a holding shaft that supports 71L and 17b. 17a.

17b is in pressure contact with the lid rotation support 4 near one end of each, and the other end is supported by wall surfaces 131L and 13b formed integrally with the spring support block 12.
A pair of coil springs whose coil portions are held by 16b always urges the cassette lid 3 toward the rear of the cassette via the pivot shaft 4. 12 is a pair of springs 17a located inside the cassette body 1;

The springs 17a, 17b and the magnetic tape are held in a removable structure inside the force nut main body 1.

This is a spring holding block placed in the middle of 8. 1
Reference numeral 4 denotes a groove formed in a part of the spring holding block so that the tip of the lid rotation support shaft 4 can fit therein and move according to the opening/closing operation of the lid. 141L is the wall surface of the holding block 12, which is higher than the groove 14, and has a spring 17 between it and the wall surface of the main body 1! Provide a gap slightly wider than the thickness of springs 17 & 17b.
1 yb is formed so that it will not come off from the rotation support shaft 4.

Furthermore, since the cassette main body 1 is generally divided into two parts, upper and lower, a holding block to which a spring 17b is attached is built into the lower cassette, and the lid 3, which is integrated with the pivot shaft 4, is attached from above. The structure allows the cassette to be easily assembled by assembling the spring 17 and the upper force center main body in this order, then stacking them one on top of the other.

The operation of the cassette of this embodiment configured as described above will be explained. The lid body 3 is always biased toward the rear of the cassette via the pivot shaft 4 by a pair of springs 171L and 17b held by the holder 12.
rotates along the fitting hole 5 formed in the cassette body 1,
Make a move. This means that the cassette lid 3 is in the open position.
Since the lid 3 acts regardless of the closed state, the lid 3 changes its position while closely contacting the rear 1 of the cassette, and its movement is controlled and reliable.

Furthermore, according to this embodiment, a pair of springs 17a.

By holding the spring 17b with a holding block and incorporating it inside the cassette body 1, it is possible to store the springs 17a and 17b, which urge the lid 3 toward the rear of the cassette body, inside the cassette body, and the spring 1 can be inserted from the outside. The unnatural appearance can be eliminated, and the value of the product as a product is greatly improved. Furthermore, a pair of springs 17&, are attached to the holding block 12.
1 holding shafts 16a, 16b, spring 17a,
By forming the wall surfaces 13a and 13b that support the ends of the cassette body 17b, for example, when an attempt is made to provide the shaft 6 for holding the spring 17 on the inner wall surface of the cassette body 1, a necessary escape hole is formed in the mold structure. 17a, which does not need to be provided in the cassette body 1 and occupies an extremely small volume inside the cassette body 1.
, 17b, so-called screw coil springs can be easily incorporated. Furthermore, a holder located inside the cassette body 1 and holding the springs 17a and 17b is a spring 17a.

The holding body 12 is placed between the magnetic tape 17b and the magnetic tape 8.
By forming the side wall surface of the magnetic tape 8 with a smooth curve, it is possible to prevent the magnetic surface of the magnetic tape 8 from being damaged by the springs 17Δ, 17b. Scratch prevention walls, etc. are no longer necessary, and the internal volume of the cassette body 1 can be effectively used to increase the maximum permissible tape roll diameter, thereby maximizing the time required for tape recording. It is. In addition, even if the tape becomes sagging inside the cassette body 1, the spring 172L due to the provision of the lid 3.

It is inconceivable that there is an increase in the possibility of entrainment around 17b.

Also, the holding block 12 is placed outside the magnetic tape 8, and the lid 31 pivot shaft 4° fitting hole 5. By completely covering the area around the springs 17 & 17b from the magnetic tape 8 and removing them, external dust accompanying the opening and closing of the lid 3 can be removed.
It is very effective in preventing dust and the like from entering the cassette tonoof and improving the dropout characteristics of the magnetic tape 8.

Effects of the Invention The present invention provides a cassette body, a U-shaped lid body for opening and closing an opening of the cassette body, a pair of pivot shafts provided on the side surfaces of the lid body, and a rotary pivot shaft provided on the cassette body. A pair of substantially triangular fitting holes into which the pivot shaft fits and tapers toward the rear, an urging means for biasing the pivot shaft toward the rear of the cassette body; The holder is arranged inside the cassette body inside the cassette body and inside the energizing means, so that the energizing means can be opened and closed with moderation. As a means of this, it is possible to use a torsion coil spring inside the cassette, which occupies an extremely small proportion of the cassette's internal volume, resulting in a cassette with an excellent appearance and reliable operation without compromising the maximum tape winding diameter. can be realized. In addition, it has a number of features for high-density recording, such as the ability to minimize the possibility of tape entanglement due to the provision of a lid, and strong performance against dropouts due to scratches, dust, etc. This makes it possible to realize a cassette with a lid.

[Brief explanation of the drawing]

Fig. 1 is a cassette with a lid, (2L) is a perspective view showing the lid in the closed state, (bl is a perspective view showing the open state, Fig. 2 is a plan perspective view thereof, and Fig. 3 is a side view thereof. Fig. 4 is a plan perspective view of the cassette in a closed state in an embodiment of the present invention, and Fig. 6 is a side perspective view thereof. 1... Cassette main body, 2... Aperture,
3... Lid, 4... Lid rotation support shaft, 161
L, 16b... Holding shaft, 17a, 17
b...-Spring, 12...Holding body. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 ■

Claims (1)

[Claims] (1) - A cassette body with an opening on the side, a U-shaped lid that opens and closes the opening, a pair of pivot shafts provided on the sides of the U-shaped lid, and a U-shaped lid provided on the side of the U-shaped lid; , a pair of substantially triangular fitting holes that taper toward the rear into which the rotation support shaft is fitted, a biasing means for urging the rotation support shaft toward the rear of the cassette body, and a cassette body. and a holder for holding the biasing means. (Sakaki) The cassette according to claim 1, wherein the holder is disposed inside the cassette body and inside the biasing means.