JPH0240186A - Tape cassette - Google Patents

Abstract

PURPOSE:To perform molding in a molding die and to obtain the same character istic by setting the same feeding property of a magnetic tape at both sides by forming an upper half and a lower half in the same shape, and setting the same function on one side and the other side of a cassette shell. CONSTITUTION:The same function is attached on one side and the other side of the cassette shell 21 i.e. a plane A side and a plane B side by forming the upper half 22 and the lower half 23 comprising the cassette shell 21 in the same shape, and no difference exists in the feeding property of the magnetic tape in the plane A side and the plane B side. In such a way, it is possible to surely and smoothly feed the magnetic tape in both directions, and to eliminate the difference of characteristics, and also, to perform the molding in the same molding die.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tape cassette that stores magnetic tape wound around a pair of reel hubs.

[Summary of the invention]

The present invention provides a tape cassette in which a cassette shell is composed of a pair of upper and lower halves, in which the upper half and the lower half are formed in the same shape, so that one side and the other side of the cassette shell are They are functionally the same, and the running properties on both sides of the magnetic tape are the same, resulting in the same characteristics.Furthermore, the upper and lower halves can be molded using molds of the same shape, reducing costs. .

[Conventional technology]

Conventionally, in tape cassettes in which tape pass pins and the like are simultaneously molded on the cassette shell, protrusions such as pins are formed protrudingly on one half of the upper and lower halves constituting the cassette shell, and protrusions such as pins are formed on the other half. It was forming the reception area.

That is, as shown in Fig. 4, the upper half (2) of the cassette shell (11) has a screw hole boss fitting hole (4a) at each corner.
, (4b), (4c), and (4d) have guide roller pin holders (5a), (5b) on both sides of the front, and a chevron lip for tape guide (6a) on the - side of the front opening (2a). are formed respectively.

On the other hand, the lower half (3) has bosses (7a), (7b), (7c), (7d) with screw holes at each corner.
There are guide roller pins (8a) and (8b) on both sides of the front.
and friction posts (9a) and (9b) are attached to leaf spring pins (10) on both sides of the center of the front opening (3a).
A), (10b) and - side portions are formed with tape guide chevron ribs (6b).

Then, as shown in Fig. 5, these upper and lower halves (2) and (3) are connected to the fitting holes (4a) and (4b) for the screw hole bosses.
), (4c) (4d) and a boss (7) with a screw hole
a), (7b), (7c), and (7d) are fitted together and tightened with screws (11) to form a cassette shell (1).

Inside this cassette shell (1) are guide roller pins (9a) and (9b) of the lower half (3).
A shield plate (12) is attached to the front opening side, and a leaf spring (14) that fixes the head pad (13) is attached to the leaf spring pin (10a) of the lower half (3). , (10b), and the magnetic tape T wound and stored around the pair of reel hubs (15a) and (15b) is guided and passed through the tape path section formed by these. A tape cassette is configured.

In addition, in conventional tape cassettes, guide pins on the front tape path were protruded symmetrically from the lower half to the lower half so that the tape could run straight through the tape path on the front opening side of the cassette shell. has also been proposed (Jitsukai Sho 5)
1-44320).

[Problem to be solved by the invention]

In conventional tape cassettes, some parts of the upper half and lower half that make up the cassette shell have symmetrical tape guide chevron ribs and guide pins in the front tape path section, but other parts are It is asymmetrically formed.

Therefore, separate molding molds are required for resin molding of the upper and lower halves, and if one half becomes defective during this molding, even if the corresponding other half is not defective, this set of As a result, both the upper and lower halves had to be discarded, resulting in waste and high costs.

In addition, since the guide rollers on both sides for the magnetic tape stored in the cassette shell are pivoted on one side, that is, on the lower half side, the magnetic tape can be fed out on one side and on the other side, the so-called A side. This causes problems such as differences in running properties and unavoidable differences in characteristics due to the difference between the B side and the B side.

The present invention has been made in view of these points, and allows the upper and lower halves constituting the cassette shell to have the same shape, so that they can be molded with molds of the same shape, and the running properties of the magnetic tape on both sides are the same. The present invention aims to provide a tape cassette that provides the same characteristics.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a tape cassette in which a set of upper and lower halves constitutes a cassette shell, in which the upper half and the lower half are formed in the same shape, and the guide member, etc. It is configured so that the magnetic tapes to be stored are arranged in the same manner on both sides.

[For production]

Since the upper and lower halves of the cassette shell are formed in the same shape, one side and the other side of the cassette shell, that is, the A side and the B side, are functionally the same. Therefore, the running properties of the magnetic tape hardly change between the A side and the B side, and the magnetic tape can be run reliably and smoothly in both directions, thereby eliminating differences in characteristics.

Moreover, by making the upper and lower halves the same shape, they can be molded using the same mold.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 shows the inner surfaces of the upper and lower halves, and the upper and lower halves are formed in the same shape.

That is, the upper half (2) constituting the cassette shell (21)
2) and the lower half (23) have fitting holes (24a) and (25a) for screw pilot hole bosses in the rear corners of the left half portions (22L) and (23L) from the center line a, respectively, and screw hole boss fitting holes (24a) and (25a) in the front corners The screw pilot hole bosses (26a) and (27a) are located near the screw pilot hole bosses, and the guide roller pins (28a) and (28b) are located between the guide roller pin and the side wall to prevent friction. Tape guide chevron ribs (30a) and (3 (lb)
) is located further closer to the front center line a with the screw pilot hole boss (26b
) and (27b) are formed, respectively.

On the other hand, in the right half parts (22R) and (23R) of the upper half (22) and lower half (23), screw pilot hole bosses (26c) and (27c) are provided at the rear corners, and screw pilot holes are provided at the front corners. The boss fitting holes (24b) and (25b) are located near the boss fitting hole and the guide roller pin receiver (31a)
) and (31b) are also the front openings (22a) and (
Insert the leaf spring pin (32a) closer to the center line a of
a) and (32b) are further closer to the front center line a, that is, the screw lower hole bosses (22L) and (23L) of the left half portions (
Fitting holes (24c) and (25c) for screw pilot hole bosses are formed at symmetrical positions with respect to the center line a from 26b) and (27b), respectively.

In addition, accidental erasure prevention claws (33a) and (33b) are provided protruding from the rear left side of the left half portions (22L) and (23L) of the upper half (22) and lower half (23), and the right half portion 22R).

Insertion recesses (34a) and (34b) are formed for the accidental erasure prevention claw near the right side of the rear surface of (23R).

A cassette shell (21) is constructed by combining the upper half (22) and the lower half (23), which are formed in the same shape, with their inner surfaces facing each other, and this cassette shell (21) has one side facing the other. , that is, in the state where the Δ plane is set at 2, the left half part has protruding members rising from the lower half (23), namely, a guide roller bin (28b), a friction boss (29b), and a tape guide chevron rib ( 30
b) is located, while on the right half there is a protruding member hanging down from the upper half (22), that is, a guide roller pin (28a).
), a friction boss (29a), and a tape guide chevron rib (30a) are positioned.

In addition, when the cassette shell (21) is inverted, that is, when it is in an eight-sided state with the upper half (22) facing downward, the protruding member of the upper half (22) is positioned in an upright position in the left half part. However, in the right half, the protruding member of the lower half (23) is positioned in a downward position.

In this way, the protruding member of the cassette shell (21) of this example is located on the left side, that is, on the supply side of the magnetic tape T to be stored (
On the supply side), it is positioned in an upright position, while on the right side, that is, on the take-up side (tick-up side) of the magnetic tape T, it is positioned in a down position.

In this way, the cassette shell (21) has the same internal configuration on the A side and the B side, so they are functionally the same and there is no difference in characteristics due to differences in running performance.

In addition, the upper half (22) of the cassette shell (21) of this example
) and the lower half (23) are formed in the same shape, so in order to mold both halves (22) and (23) with resin, they can be molded with the same shape, that is, an Everturn-shaped mold. Equipment costs have been reduced, and if a defective product occurs during molding, it is only necessary to discard the defective half. Even if the corresponding half is not defective, there is no waste due to discarding both halves, and the yield is improved.

In addition, in the above structure, the fitting hole (24) of the screw pilot hole boss in the central front part of the upper half (22) and the lower half (23)
c) and (25c) and screw hole boss (26b) and (2
7b) can be omitted, and each boss can be modified to form fitting recesses (35a) and (36a) as shown in FIG.
It is also possible to form the fitting projections (35b) and (36b) to form a snap fit.

Furthermore, the fitting holes and screw pilot hole bosses at each corner of the upper half (22) and lower half (23) are all set to screw pilot holes (37a) and (37b) of the same shape, as shown in FIG. It may be formed as a blank hole and tightened with a screw (11), or it may be formed as a blank hole and tightened using a bolt/Nand method.

Although the present invention has been described in detail above, the present invention is not limited to this embodiment, and can be modified in various ways without departing from the spirit of the present invention.

〔Effect of the invention〕

As described above, according to the present invention, since the upper and lower halves of the cassette shell are formed in the same shape, the configurations on the supply side and the winding side of the magnetic tape stored on both the A side and B side are the same, and the functions are the same. Therefore, there is no difference between the A side and the B side, and recording and reproduction can be performed under exactly the same conditions without any difference in characteristics due to the difference in running properties of the magnetic tape.

In addition, in resin molding of the upper and lower halves, only one mold shape is required for the mold, which reduces equipment costs for the mold, and if a defective product is produced, the defective half and the corresponding good half can also be discarded. Yields are improved because only defective product halves need to be discarded, and since only one type of cassette half is molded, product management before cassette shell assembly is extremely easy, eliminating the trouble of supply during automatic assembly. This has various effects such as eliminating problems and improving work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the inner surface of the upper and lower halves of an example of a tape cassette according to the present invention, FIG. 2 is a sectional view of a portion of another example, FIG. 3 is a sectional view of a portion of another example, and FIG. 4 is a conventional example. FIG. 5 is a partially cutaway perspective view of a conventional tape cassette. In the figure, (22) is the upper half, (23) is the lower half, (28
a). (28b) is a guide roller pin, (29a), (2
9b) is a friction boss, (30a), (30b
) are chevron ribs for tape guide, (32a), (32
b) is a leaf spring bottle.

Claims (1)

[Claims] In a tape cassette in which a cassette shell is formed by a pair of upper and lower halves, the upper half and the lower half are formed in the same shape, and one side of the cassette shell and the lower half are formed in the same shape. A tape cassette characterized in that the other side is functionally the same.