JPS6079583A - Cassette - Google Patents

Abstract

PURPOSE:To realize a cassette with cover which is operated surely with a simple constitution without reducing a maximum tape winding diameter by providing an energizing means which energizes a cover body turning supporting shaft to the rear of a cassette and arranging this energizing means symmetrically with respect to an axis in the energizing direction. CONSTITUTION:Turning supporting shafts 4 are provided on the side face of a cassette cover 3, and fitting holes 5 of turning supporting shafts 4 a tapered toward the rear and having an about triangular shape are formed on the side face of a cassette body 1. A pair of kick springs 17a and 17b are arranged axially symmetrically with respect to a center line 14 in the thickness direction which passes centers of supporting shafts and goes toward the rear of the cassette body 1 and energize the cover 3 to the rear. By this constitution, the conventional volume occupied by tension springs in the cassette is reduced to the volume corresponding to the thickness of kick springs 17a and 17b, and therefore, it is possible that a maximum tape windable diameter in the cassette is equal to that of current analog cassettes as shown by 11.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improvements in cassettes, and more particularly to a cassette provided with a lid for opening and closing the front surface of the cassette.

Conventional configuration and its problems In recent years, magnetic recording using tape force setting If has been trending toward higher performance and higher density, and it is necessary to prevent the tape from being exposed to the outside air (V) or from being touched by fingers and leaving fingerprints. 4, therefore, it is possible to put a lid on the opening 1'' on the front of the cassette, which has already been done for video cassettes, etc. When trying to apply this to audio cassettes, Furthermore, it is desired that the structure is simple and can be implemented at low cost.

The cassette proposed by the present inventors hereafter will be described below. FIG. 1 is a perspective view showing the opened and closed states of the cassette, with (a) showing the closed state and (b) showing the opened state. Figure 2 is a plan perspective view of the main part, Figure 3
The figure is a side view. .

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 5 provided in the cassette cover rotation support shaft 5 is a fitting hole for the cassette lid rotation support shaft 4, and is formed on the side surface of the cassette body 1 in a substantially triangular shape that tapers toward the rear. 6 is a pin for a spring hook formed integrally with the cassette body 1, and 7 is a spring whose one end is hung on the cassette lid rotation support shaft 4, which always urges the cassette lid 3 backward. 8 is a magnetic tape, and 9 is a protective wall that protects the magnetic surface of the magnetic tape 8 from the spring 7. 1o is an imaginary line indicating the maximum diameter of the magnetic tape 8 that can be wound into a cassette having such a structure, and 11 is a virtual line indicating the maximum diameter of a magnetic tape 8 that can be wound into a cassette for audio, which is currently widely used. This is an imaginary line indicating the maximum diameter of 1.

The operation of the cassette configured as above will be explained. First, in order to open the lid of the cassette in the closed state shown in FIG. 1(a), the lower front edge of the lid 3 may be pushed upward. Since the lid 3 is urged backward by the spring 7, the lid 3
rises along the front surface of the cassette opening, and when it rises more than half way, it rotates clockwise about the upper part of the front edge of the opening as a fulcrum and fits tightly against the upper surface of the cassette. When closing, move the cassette lid 3 in the state shown in Figure 1(b) forward along the cassette body 1, and the opening will close in the opposite direction to the opening. Figure 1 (
−). The lid can be opened downward, but when used in actual equipment, one cassette can be used on both sides.
The lid 3 always opens toward the inside of the device.

However, in the configuration described in 2, the spring 7 that urges the pivot shaft 4 provided on the cassette lid 3 toward the rear of the cassette body 1 is configured as a so-called tension spring and is placed inside the cassette. The need for a protective wall 9 to protect the surface of the spring 7, and the need for the winding diameter of the spring 7 to be at least 2 degrees, reduce the available volume within the cassette. The maximum winding diameter that could be achieved was smaller than that of the current half cassette, creating a major drawback in ensuring long recording and playback times.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems, and aims to provide a cassette with a lid that has an extremely simple structure and operates reliably without compromising the maximum allowable tape winding diameter.

Structure of the Invention The present invention provides a cassette body, a U-shaped lid for opening and closing an opening of the cassette body, a pair of rotating shafts for the lid provided on the sides of the U-shaped lid, and a U-shaped lid for opening and closing an opening of the cassette body. A pair of substantially triangular fitting holes which are provided and into which the pivot shaft fits and taper toward the rear, and a biasing means for biasing the pivot shaft toward the rear of the cassette. This is a cassette in which the biasing means is arranged approximately axially symmetrically with respect to the biasing direction, and it is possible to realize a cassette with a lid that operates reliably with an extremely simple configuration without reducing the maximum tape winding diameter. It is something.

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. 5 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.
A rotation support shaft 5 provided on the side surface is a fitting hole for the cassette lid rotation support shaft 4, and is formed on the side surface of the cassette body 1 in a substantially triangular shape tapering toward the rear. 1ea and 16b are spring hook shafts formed integrally with the spring support block 12; 17a and 1yb have one end pressed against the cassette lid rotation support shaft, and the other end formed integrally with the spring support block 12. A pair of so-called kick springs supported by a wall surface 13 are arranged axially symmetrically with respect to a center line 14 in the thickness direction passing through the center of the rotation support shaft 4 and facing rearward of the cassette body 1, and always push the cassette lid 3 backward. Built into one cassette half. Reference numeral 8 indicates a magnetic tape, and reference numeral 11 indicates the maximum winding diameter of the magnetic tape wound within the cassette body 1 in this configuration.

An example of the operation of the receptacle 7) of this embodiment constructed as described above will be explained with reference to FIGS. 6 and 7.

Components 1.3 and 4.6 in the figure are the same as those shown in FIGS. 1 and 5. FIG. 6 shows the forces F and F' exerted by the spring 7 on the pivot shaft 4 provided on the case no L-lid 301111 surface in the configuration shown in FIG.

FIG. 7 shows how the cassette lid 3 is moved by the pair of springs 1a and 17b according to the present embodiment shown in FIGS. 4 and 5. Forces f11 and f2 that act on the rotation support shaft 4 provided in
1 f1'#f2' l f1' l f2'' are shown according to the positions of the respective cassette lids 3.

- As an example, when examining the state of the force when the cassette lid 3 closes the opening 2 of the cassette body 1 using FIG. Since it is in pressure contact with the shaft 4, the rotation support shaft 4 has f4.
A force f2 is applied.

Since the pivot shaft 4 provided on the side surface of the cassette lid 3 is restrained by the fitting hole 5 provided on the side surface of the cassette body 1, it is attached to the rear of the cassette body 1 when fl + f2 is received. Forced. This causes a force F equivalent to that in the example shown in FIG. 6(,) to be applied, and the movement of the cassette lid 3 to be the same as in the case shown in FIG.

This means that the position of the cassette lid 3 is different (b), (
The same applies to case C), and the movement of the lid 3 in this embodiment is the same as that of the cassette in FIG. 2.

As described above, according to this embodiment, a pair of kick springs are used as biasing means for biasing the pivot shaft of the lid body toward the rear of the cassette body, so that the winding of the tension spring 7 is The volume occupied inside the cassette by the diameter of the kick spring 17 a
, the maximum diameter of the tape that can be wound inside the cassette is
Setting the diameter to 11, which is the same as the so-called current analog power center, makes it possible to use IIJ, and guarantees long-term recording and playback characteristics.
This is what J-Noh is all about. Furthermore, by using two kick springs as the biasing means, it is generally possible to assemble the kick spring 17b into the first cassette body even when assembling a cassette body that is divided into two lower parts. Insert the τJ digit spring support block 12 into the lid 3. Kick spring 17a
Incorporating 11 side forces, 10 solenoids, in this order increases the efficiency and further improves assembly workability.

In this embodiment, as shown in FIG. 5, the first force generating means is a pair of kick springs 17a and 17b, but these are replaced by two kick springs on the left and right sides, respectively, as shown in FIG. 8(a). You may use one book at a time. This makes it possible to use only one type of kick splash and reduce the number of types of parts. It is also possible to use an integrated kick spring as shown in FIG. 8(b), which is effective in reducing the number of parts. Also, the kick spring shown in Fig. 8(c) is
If used as a tool, the number of parts will be reduced and there will be no directionality during assembly, which will have the effect of improving work efficiency. Furthermore, as shown in FIG. 8(d), even if an elastic material such as a wire is used, the same effect can be obtained in opening and closing the lid, and the unit cost of parts can be significantly reduced.

Effects of the Invention The present invention provides a cassette body, a U-shaped lid for opening and closing the opening of the cassette body, a pair of pivot shafts for the lid provided on the side surfaces of the U-shaped lid, and a rotation shaft provided in the cassette body. and a pair of substantially triangular fitting holes into which the pivot shaft is fitted and which taper toward the rear, and a biasing means such as a kick spring or the like arranged approximately axially symmetrically with respect to the biasing direction. By using a configuration in which the rotating shaft is biased toward the rear of the cassette body, it is possible to realize a cassette with a lid of a simple configuration without impairing the maximum permissible tape winding diameter. By integrating the A-force means arranged axially symmetrically with respect to the A-force direction, it is possible to realize a cassette with a number of excellent features such as a reduction in the number of parts and assembly. be.

[Brief explanation of the drawing]

Fig. 1 shows the opened and closed states of the cassette with a lid, (a) is a perspective view of the closed state, (b) is a perspective view of the open state, Fig. 2 is a plan perspective view of its main parts, and Fig. 3 is its perspective view. 4 is a plan perspective view of the cassette in a closed state in an embodiment of the present invention, FIG. 5 is a side perspective view thereof, and FIGS. 6 (-), (b),
(c) is an explanatory diagram of the cassette in Figure 2.
...Cassette body, 2...Opening, 3...
Lid, 4... Lid rotation support shaft, 17a, 1-end b...
Spring, 12...Spring support. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure (0 3 (-b) Figure 2 Figure 3 Figure 6 Figure 7 Figure 8 (α) (C) (b) (d-Ra

Claims (2)

[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, and The rotation support shaft is fitted with a pair of substantially triangular fitting holes that taper toward the rear, and a biasing means for biasing the rotation support shaft toward the rear of the cassette body. A cassette characterized in that a biasing means is arranged approximately axially symmetrically with respect to a biasing direction. (2) The cassette according to claim 1, characterized in that the biasing means arranged approximately axially symmetrically with respect to the biasing direction is integrally constructed.