JPH0572034B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a slider that has an opening in its bottom surface into which a tape drawing means is inserted, is slidably supported on the bottom surface side, and allows the opening to be opened and closed. The present invention relates to a tape cassette equipped with a tape cassette.

BACKGROUND ART Conventionally, a tape cassette is provided with a slider for opening and closing an opening into which a tape drawing means is inserted.
The structure was as shown in FIGS. 4 to 7.

That is, the cassette body 1 is formed by connecting upper and lower plastic cassette halves 1a and 1b with screws, etc., and a magnetic tape 2 is placed inside the cassette body 1.
The hubs 3 and 3' around which the material is wound are rotatably mounted. At the center of the front surface of the cassette body 1 in the width direction, an opening 4 into which a tape drawing means is inserted is recessed toward the inside of the cassette. The upper surface of this opening 4 is closed by the upper cassette half 1a, but its front and lower surfaces are open. A front cover 5 for protecting the tape is rotatably mounted on the front surface of the cassette body 1, and is always urged to close by a spring member (not shown). A slider 6 is attached to the bottom of the cassette body 1 to close the opening 4 when not in use. The slider 6 has a flat plate shape along the outer surface of the cassette bottom wall 7, and has holes 9, 9' corresponding to the drive shaft insertion holes 8, 8' on the left and right sides of the center, and side walls continuous from the left and right sides. Board 1
0 is fitted onto the left and right side walls 11 of the cassette body 1 in a manner that prevents it from coming off, and is slidable between a position where the opening 4 is closed and a position where the opening 4 is opened. Further, the cassette body 1 is provided with a torsion coil spring 12 so as to always bias the opening 4 in the direction of closing the slider 6. The torsion coil spring 12 has a cylindrical coil portion 12a inserted into a spring support shaft 13 integrally formed to protrude from the inner surface of the cassette bottom wall 7, and an arm portion 12b extending from one end of the cylindrical coil portion 12a is inserted into the spring support shaft 13. A spring receiver 14 is engaged with a groove 13a provided on the upper end surface, and the tip of an arm portion 12c that extends long from the other end of the cylindrical coil portion 12a projects from the center in the width direction near the front end of the slider 6. By being engaged with the torsion coil spring 12, the slider 6 is always urged forward by the force of the torsion coil spring 12.

Problem to be Solved by the Invention However, in the conventional configuration, the position of the spring support shaft 13 that supports the cylindrical coil portion 12a of the torsion coil spring 12 is limited to the vicinity of both rear ends of the opening 4. Slider 6 as shown
The spring force F ₁ that biases the slider 6 in the closing direction acts as a force that rotates the slider 6, making it impossible to obtain smooth sliding characteristics. Further, since the arms 12b and 12c of the torsion coil spring 12 have different shapes, it is necessary to align the directions during assembly, making automatic assembly difficult. Furthermore, as shown in FIG. 5, the spring force of the torsion coil spring 12 exerts a force F3 pushing down the slider ₆ , so the slider 6 is easily deformed (especially when left at high temperatures), not only degrading its appearance but also damaging the tape recorder itself. This had the disadvantage that the wearability of the device deteriorated.

A first object of the present invention is to ensure stable sliding performance of the slider that is slidably supported on the bottom side of the cassette body. A second purpose is to further prevent deformation of the slider by simplifying the ease of assembling the slider to the cassette body.

Means for Solving the Problems In order to solve the above problems, the tape cassette of the present invention includes upper and lower cassette halves in which a magnetic tape is wound around a pair of hubs and stored therein, and a tape provided on the bottom side of the cassette half. a slider slidably supported on the bottom side of the cassette half so that the opening into which the drawer is inserted can be opened and closed;
a torsion coil spring that biases the slider in a closing direction; the torsion coil spring is attached and supported by a support provided in the center near the front end of the slider, and both legs of the torsion coil spring are attached to the front outer wall of the lower cassette half. The torsion coil spring is characterized in that the torsion coil springs are brought into contact with each other in substantially symmetrical positions on the left and right sides from the center in the width direction, and the tips of both leg parts of the torsion coil spring are rounded in opposite directions so as to be approximately at the same height as the coil part. . Also,
A locking portion for positioning the leg portion of the torsion coil spring is provided on the inner surface of the slider, and the leg portion of the torsion coil spring slides on a position regulating rib formed to protrude from the inner surface of the slider. A rib extending in the width direction is formed near the center of the front end of the slider, and the leg portion of the torsion coil spring slides on a plate protruding from the front outer wall of the lower cassette half. It is characterized by the following.

With this configuration, the spring force of the torsion coil spring that biases the slider in the closing direction is applied symmetrically to the front of the cassette, and smooth sliding characteristics are obtained without applying rotational force to the slider, and the coil portion of the torsion coil spring By making the feet and legs almost the same height, there is no directionality when wearing the product. In addition, by providing locking parts to position both legs of the torsion coil spring, stable attachment to the slider is possible.Furthermore, the legs of the torsion coil spring slide on position regulating ribs that protrude from the inner surface of the slider. This prevents the legs from getting between the lower cassette half and the slider during assembly and sliding, greatly improving ease of assembly. Furthermore,
A rib is formed at the center of the front end of the slider to improve the rigidity of the slider, and the slider is lifted upward by sliding the legs of the torsion coil spring on a plate that protrudes from the front side wall of the lower cassette half. Force is generated and deformation can be prevented.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

Since the overall structure of the tape cassette is almost the same as that of the conventional tape cassette, the following will mainly explain the differences from the conventional structure for attaching a spring to a slider.

As shown in FIG. 1, a support column 21 for mounting and supporting a torsion coil spring 20 is provided at the center of the slider 6 near its front end. This support portion 21 has a hook at its tip. The legs 20a and 20b of the torsion coil spring 20 with the coil portion 20e fitted to the support column 21 are pressed and biased from the widthwise center of the front outer wall portion 22 of the lower cassette half 1b at approximately symmetrical positions on the left and right. I'm letting you do it. As a result, the spring force F ₁ biasing the slider 6 in the closing direction becomes symmetrical, and smooth sliding characteristics can be obtained without applying any rotational force to the slider. Then, as shown in FIG. 3, the tips 20c and 20d of both legs of the torsion coil spring 20 are rolled up in opposite directions, so that the height of the coil portion 20e is A.
By making the heights B and C of the spring leg tips 20c and 20d almost the same height, the directionality is eliminated.
The torsion coil spring 20 can be easily attached to the support column 21. Also, a locking portion 2 for positioning the spring legs 20a, 20b of the torsion coil spring 20 is provided.
5 and 25' on the inner surface of the slider 6, the torsion coil spring 20 can be stably mounted, and the upper surface of the position regulating rib 26 protruding from the inner surface of the slider 6 can be attached to the spring legs 20a, 25' of the torsion coil spring. By sliding the spring legs 20b, it is possible to prevent the spring legs 20a and 20b from entering between the slider 6 and the lower cassette half 1b during assembly and sliding, and the ease of assembly is greatly improved. Since a rib 24 extending in the width direction is formed at the center of the front end of the slider 6, the rigidity of the slider 6 alone is improved, and as shown in FIG. 2, the front outer wall of the lower cassette half 1b is forming plates 23, 23' protruding from 22;
Both legs 20 of the coil spring 20 are twisted on its upper surface.
By allowing a and 20b to slide, a force F ₂ is generated that lifts the center portion of the slider 6 in the width direction, and a spring force F ₁ that biases the slider 6 in the closing direction shown in FIG. This is balanced with the generated force F ₃ that pushes down the widthwise central portion of the slider 6, making it possible to prevent the slider 6 from deforming.

Effects of the Invention As described above, according to the present invention, a torsion coil spring is attached and supported to the support provided in the center near the front end of the slider, and both legs of the torsion coil spring are connected in the width direction of the front outer wall of the lower cassette half. By applying pressure to the slider so that it is biased and biased from the center to approximately symmetrical positions on the left and right, a symmetrical forward biasing force is applied to the slider, and stable sliding performance of the slider is obtained, as well as the aforementioned torsion. By rounding the tips of both legs of the coil spring in opposite directions so that they are approximately at the same height as the coil portion, there is no direction in which the torsion coil spring can be attached to the slider. Further, by providing locking portions for positioning both legs of the torsion coil spring on the inner surface of the slider, it is possible to stably attach the torsion coil spring to the slider, and furthermore, a position regulating rib formed to protrude from the inner surface of the slider is provided. Since the spring leg of the torsion coil spring slides on the upper part, it is possible to prevent the spring leg from getting between the lower cassette half and the slider during assembly, and the ease of assembly is greatly improved. A rib extending in the width direction is formed at the center of the front end of the slider to improve the rigidity of the slider, and the torsion coil spring is mounted on a plate protruding from the front side wall of the lower cassette half. By sliding the legs, a force is applied to the slider to draw it toward the cassette half, thereby preventing deformation of the slider. As a result, the durability, environmental resistance, and productivity of the tape cassette can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a plan view of essential parts of a tape cassette according to an embodiment of the present invention, FIG. 2 is a view taken along the Y arrow in FIG.
Fig. 3 is a perspective view showing a state in which a torsion coil spring is attached to the slider of the same tape cassette, Fig. 4 is a plan view of the main part of the conventional tape cassette, Fig. 5 is a view taken in the direction of the Y arrow in Fig. 4, and Fig. 6 7 is an exploded perspective view showing the external shape of the bottom wall of the conventional tape cassette and the slider. 1a... Upper cassette half, 1b... Lower cassette half, 2... Magnetic tape, 3, 3'... Hub,
4... Opening, 6... Slider, 20... Torsion coil spring, 20a, 20b... Legs of torsion coil spring, 20c, 20d... Leg tips of torsion coil spring, 20e... Coil part of torsion coil spring, 21 ...Strut part, 22...Outer wall part, 2
3,23'...Plate, 24...Rib, 25,
25'...Locking portion, 26...Position regulating rib.

Claims (1)

[Scope of Claims] 1. Upper and lower cassette halves storing a magnetic tape wound around a pair of hubs, and an opening provided on the bottom side of the cassette half into which a tape pull-out means is inserted, and the cassette halves are arranged so that the opening for inserting the tape pull-out means can be opened and closed. The slider includes a slider slidably disposed on the bottom side of the half, and a torsion coil spring that biases the slider in a closing direction, and the torsion coil spring is mounted and supported on a support provided in the center near the front end of the slider. At the same time, both legs of the torsion coil spring are pressed against the center of the front outer wall of the lower cassette half at substantially symmetrical positions to the left and right so as to be biased, and the torsion coil spring is pressed against the coil part and its legs. A tape cassette characterized in that it has legs extending from the top and bottom, and the ends of both legs are rounded in opposite directions so as to have approximately the same height as the coil part. 2. The tape cassette according to claim 1, characterized in that a locking portion for positioning both legs of the torsion coil spring is provided on the inner surface of the slider. 3. The tape cassette according to claim 1, wherein a position regulating rib is provided to protrude from the inner surface of the slider so that the leg portion of the torsion coil spring can slide. 4. The tape cassette according to claim 1, wherein a rib extending in the width direction is formed near the center of the front end of the slider. 5. The tape cassette according to claim 1, further comprising a plate protruding from the front outer wall of the lower cassette half so that the legs of the torsion coil springs slide.