JPS6331260Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape cassette having an opening/closing lid for protecting magnetic tape, and its purpose is to prevent the opening/closing lid from being disassembled after the tape cassette is assembled.

Generally, most magnetic tapes are used in the form of tape cassettes, depending on how they are used. Particularly in the case of video tape cassettes, due to the severe requirements, a lid is provided to cover the magnetic tape when not in use. In addition, in recent years, with the development of small VTRs, tape cassettes have also been required to be smaller and thinner.
Developments to improve rigidity are progressing.

Conventionally, there are tape cassettes shown in FIGS. 1 and 2 that have an opening/closing lid for protecting magnetic tapes. That is, when the upper half 1 and the lower half 2 are combined, the pivot shafts 3a and 3b of the opening/closing lid 3 are rotatably supported at the combined portion of the upper half 1 and the lower half 2. However, with this configuration, when the opening/closing lid 3 is made thinner due to recent miniaturization and thinning, the rigidity decreases and when handling, the front part 3c of the opening/closing lid 3
bends in the direction of arrow A, and both ends of the opening/closing lid 3 bend in the direction of arrow B.
If the tape cassette moves in the direction of arrow C, the opening/closing lid 3 may come off from the tape cassette body. There is also the problem that the opening/closing lid may come off when the tape cassette body falls. In order to solve this problem, as shown in FIGS. 3 and 4, the thickness t of the upper half 1 and the lower half 2 is
A slightly longer shaft portion 4a is provided, and a flange portion 4b having a diameter larger than the notch portion 1a for engagement with the rotation shaft 4 provided on the upper half 1 is provided at the tip of the shaft portion 4a. A method has been proposed in which the opening/closing lid 3 is prevented from disassembling by coming into contact with the inner wall of the cassette body. However, according to the above-described method, when the tape 5 is pulled out from the tape cassette body to a position of a certain length L for loading, as shown in FIG. In this case, the tape 5 is attached to the rotation axis 4 of the opening/closing lid 3.
It is conceivable that the tape 5 may come into contact with the flange portion 4b and damage the surface of the tape 5.

The present invention provides a further improved tape cassette with a simple structure, and one embodiment of the present invention will be described below with reference to FIGS. 5 and 6.

Reference numeral 6 designates an upper half, which has a convex portion 6a at its lower portion, and a bearing portion 6c having a tapered portion 6b that widens inward at the center of the convex portion 6a. A lower half 7 is provided with a recess 7a that fits into the projection 6a. Reference numeral 8 designates an opening/closing lid, which is provided with a protrusion 8a so as to be able to engage with a bearing 6c.The protrusion 8a has a flange 8b, and a flange 8b.
A tapered shaft portion 8c is provided which widens inward with a diameter slightly smaller than the diameter of the bearing portion 6c and the diameter of the bearing portion 6c, and the length l of the tapered shaft portion 8c is the same as the thickness t of the upper half 6 and the lower half 7. Or maybe it's a little shorter. By engaging the tapered shaft portion 8c of the projection 8a with the portion formed by the bearing portion 6c of the upper half 6 and the lower half 7,
The opening/closing lid 8 is prevented from disassembling due to the shape of the tapered portion 6b of the bearing portion 6c of the upper half 6 and the tapered shaft portion 8c against the movement in the direction of the arrow D in which the opening/closing lid 8 tends to come off outward. Also, the tapered shaft portion 8c
Since the length l is the same as the thickness t of the upper half 6 and the lower half 7, it is slightly shorter, so that the surface of the tape 9 is prevented from being damaged without coming into contact with the tape 9 during the tape pass during loading. It can be prevented.

FIG. 7 shows another embodiment of the present invention, in which 10 is an upper half, and a tapered part 10 that spreads inward at the lower part.
A bearing portion 10b having a diameter is provided. Reference numeral 11 denotes a lower half, and a bearing portion 11b having a tapered portion 11a expanding inward is provided at a position facing the bearing portion 10b. The bearing portion 10b of the upper half 10 and the bearing portion 11b of the lower half 11 form a tapered shaft hole. Reference numeral 8 designates an opening/closing lid, which is provided with a protrusion 8a so as to be able to engage with a shaft hole formed by the bearings 10b and 11b.
A tapered shaft portion 8c that widens inward is provided with a diameter slightly smaller than the diameter of b.
The length l of c is the same as or slightly shorter than the thickness t of the upper half 10 and lower half 11.
By engaging the tapered shaft portion 8c of the protrusion 8a with the tapered shaft hole formed by the bearing portion 10b of the upper half 10 and the bearing portion 11b of the lower half 11, the protrusion 8a tends to be moved outward. The opening/closing lid 8 is prevented from disassembling due to the effect of the shape of the tapered shaft hole and tapered shaft portion against movement.
Further, the surface of the tape is not damaged during the tape pass during loading.

As described above, according to the present invention, due to the simple structure in which the tapered bearing formed by the upper half and the lower half and the rotating shaft of the opening/closing lid are made into a tapered shaft, the opening/closing lid does not easily disassemble and can be used easily during loading. This prevents damage to the tape surface during the tape pass, which has a great effect on product quality.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional tape cassette; Figure 2 is a perspective view of a conventional tape cassette;
The figure is a sectional view of the lower half of the same tape cassette.
The figure is a perspective view of the main part of a tape cassette already proposed by the present inventors, FIG. 4 is a sectional view of the main part of the lower half of the tape cassette, and FIG. 6 is a sectional view of a main part of the lower half of a tape cassette in one embodiment of the present invention, and FIG. 7 is a perspective view of a main part of a tape cassette in another embodiment of the present invention. 6... Upper half, 6c... Bearing part, 7... Lower half, 8... Opening/closing lid, 8c... Tapered shaft part,
10... Upper half, 10b... Bearing section, 11...
Lower half, 11b...bearing part.

Claims (1)

[Scope of utility model registration request] An upper half that constitutes an upper case, a lower half that forms a pair with the upper half through a joint with the upper half to constitute a housing, and is provided so as to be able to wind tape or store a reel; It has a shaft part that is rotatably supported by a bearing part formed at the joint part of the half, and an opening/closing lid that can be rotated around this shaft part, and the bearing part moves toward the inside of the housing. A tape cassette having a widening taper part, the shaft part having a taper part having an inclination substantially equal to the taper part of the bearing part, and the end part of the shaft part being formed so as not to protrude from the bearing part.