JPH05242632A - Tape cassette - Google Patents

Abstract

PURPOSE:To attain a smooth inserting work of a supporting shaft to an insertion port of a lid body. CONSTITUTION:A 2nd taper 33 spread toward an opening at the inserting side is formed on an opening inner peripheral surface at the inserting side of the insertion port 32 whereon the supporting shaft 2b is fronted. By this arrangement, a torsion spring S can be guided along the 2nd taper 33 at the time of insertion of the supporting shaft 2b to the insertion port 32 of the lid body 31, therefore, a restriction for the insertion of torsion spring S caused by the lid body 31 is prevented, even though the torsion spring S is slightly shifted in the radial direction from a center position of the insertion port 32 and abutted to an opening end face.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette provided with a tape which is driven by driving a drive belt in a cassette case.

[0002]

2. Description of the Related Art A tape cassette provided with a tape having a high track density is known as an external recording means such as a personal computer.

Conventionally, this type of tape cassette is disclosed in, for example, Japanese Patent Publication No. 52-14976, and is constructed as shown in FIG.

This tape cassette will be described with reference to the same drawing. In FIG. 1, the reference numeral 1 is a case for the tape cassette, and a notch 2a for exposing the tape which is opened at the front edge and protrudes upward. A base plate 2 having a supporting shaft 2b having a substantially rectangular shape in a plan view, and a first opening 3 for exposing the roller, which is mounted on an upper portion of the base plate 2.
a and a rectangular box 3 having a second opening 3b for exposing the tape, inside of which two reels 4 and 5 for winding the tape which are juxtaposed in parallel to each other in the left-right direction of the plate surface are rotated. It is provided freely. A head (not shown) for the recording / reproducing apparatus is assumed to move forward and backward in the front part of the case 1 (the notch 2a of the base plate 2 and the second opening 3b of the box 3).

Reference numeral 6 denotes a lid for opening and closing the second opening 3b, which is rotatably provided on the support shaft 2b through a restoring torsion spring S. The lid 6 has concave grooves 6b, 6c (concave groove 6b) in which the insertion shaft 6a facing the support shaft 2b and both ends of the torsion spring S face.
(Only shown).

Reference numerals 7 and 8 denote two tape guides having flanges 7a and 8a for restricting movement in the tape width direction. The tape guides 7 and 8 are arranged in front of the reels 4 and 5 and arranged side by side at the front edge of the base plate 2. Has been done.

Reference numerals 9 to 11 denote upwardly protruding first to third guide pins, which are press-fitted and fixed to the base plate 2 and between the reel 4 and the tape guide 7, between the tape guides 7 and 8, and the tape. Guide 8 and the reel 5
It is provided in each tape running path between them and is configured to guide the magnetic tape 12 together with the tape guides 7 and 8.

A drive roller 13 for a tape cassette, a part of which faces the first opening 3a, is provided at the rear of the tape running path between the tape guides 7 and 8 and is supported by the base plate 2 as a spindle. It is rotatably supported via 14.

Numerals 15 and 16 are guide rollers for guiding the belt, which are rotatably arranged behind the reels 4 and 5 via the respective support shafts 17 and 18, and also the base plate 2
Are juxtaposed at the rear edge of the.

Reference numeral 19 denotes an endless drive belt for running the tape, which is wound around the drive roller 13 and the guide rollers 15 and 16 and is stretched on the outer peripheral surfaces of the reels 4 and 5 via the magnetic tape 12. Has been done.

Reference numeral 20 is a mirror body for detecting the tape end.

In the tape cassette thus constructed, the magnetic tape 1 is opened by opening the lid during use (recording / reproducing).
The head contact surface of No. 2 is exposed to the outside, and the head contact surface of the magnetic tape 12 is protected by closing the lid when not in use.

By the way, in this kind of tape cassette, the lid 6 is attached to the support shaft 2b as follows.

That is, as shown in FIG.
The winding part of the torsion spring S is loaded around b,
Next, as shown in FIG. 3B, the torsion spring S is supported by the positioning claw T of the insertion machine (not shown) on the support shaft 2b.
After positioning in the circumferential direction, the support shaft 2b is inserted into the insertion hole 6a as shown in FIG. 7C, and each end of the torsion spring S is attached to the lid 6 and the flange 7 of the tape guide 7.
a (not shown in FIG. 3).

[0015]

However, in the conventional tape cassette, as shown in FIG. 4, the opening diameter of the insertion hole 6a is set to be slightly larger than the winding diameter of the torsion spring S. No, for this reason the insertion hole 6
When the support shaft 2b is inserted into the a, the torsion spring S
When is slightly displaced from the center position of the insertion hole 6a in the radial direction, the torsion spring S hits the opening end surface of the insertion hole 6a and is restricted from being inserted, so that the support shaft 2b cannot be smoothly inserted into the insertion hole 6a. There was a problem.

The present invention has been made in view of such circumstances, and it is possible to prevent the return spring from restricting the insertion of the return spring by the lid when the support shaft is inserted into the insertion hole, and thus the support shaft is inserted into the insertion hole. The present invention provides a tape cassette capable of smoothly performing the above.

[0017]

SUMMARY OF THE INVENTION A tape cassette according to the present invention has a case having a recording / reproducing head having an opening for advancing and retreating inward and a support shaft projecting to one side, and an opening and closing for the opening of the case. In a tape cassette provided with a lid body which is freely provided and has an insertion hole facing the support shaft, and a return spring which is provided around the support shaft and whose ends are locked to the cover body and the case, A taper is formed on the inner peripheral surface of the insertion side opening of the insertion hole so as to spread toward the insertion side opening.

[0018]

In the present invention, the return spring can be guided along the taper when the support shaft is inserted into the insertion hole.

[0019]

Embodiments of the present invention will be described in detail below with reference to embodiments shown in the drawings.

FIG. 1 is a sectional view showing a main part of a tape cassette according to the present invention. In FIG. 1, the same members as those in FIGS. 2 to 4 are designated by the same reference numerals and detailed description thereof will be omitted.
Further, in the description of the embodiment, the same members as those used in the description of the conventional example are designated by the same reference numerals and used.

In FIG. 1, reference numeral 31 denotes a lid for opening and closing the second opening 3b, which is rotatably provided around the support shaft 2b via the torsion spring S. The lid 31 has two large and small holes 32a and 32b each having a different diameter and both the holes 32a and 32a.
The first taper 3 that spreads from above to below between 32b
There is provided an insertion hole 32 having an inner diameter 2c and facing the support shaft 2b. Then, on the inner peripheral surface of the opening of the insertion hole 32, from the upper opening to the lower opening (the opening on the insertion opening side).
A second taper 33 is formed so as to widen toward. Further, on the lower opening end surface of the insertion hole 32, a concave groove 32d (only one of which is shown) is provided which both ends of the torsion spring S face.

In the tape cassette thus constructed, the torsion spring S can be guided along the second taper 33 when the support shaft 2b is inserted into the insertion hole 32 of the lid 31. Even if the opening 31 is slightly displaced from the center position of the insertion hole 32 in the radial direction and comes into contact with the opening end surface, the insertion restriction of the torsion spring S by the lid 31 can be prevented.

Incidentally, the recording / reproducing of the tape cassette in the present embodiment is carried out by mounting the case 1 on the recording / reproducing apparatus (not shown) with the lid 6 facing forward.

At this time, the lid 6 is opened, the magnetic tape 12 is pressed against the head (not shown) for the recording / reproducing apparatus at the position where the tape is exposed to the outside, and the capstan roller (not shown) for the recording / reproducing apparatus is also used. ) Is pressed by the drive roller 13 for the tape cassette. Then, the drive roller 13 is rotated by the rotation of the capstan roller (not shown), the endless drive belt 19 is driven in a predetermined direction, and the magnetic tape 12 runs.

The lid 31 can be attached to the support shaft 2b in the present embodiment in the same manner as in the conventional case.

That is, as shown in FIG.
The winding part of the torsion spring S is loaded around b,
Next, as shown in FIG. 3B, the torsion spring S is supported by the positioning claw T of the insertion machine (not shown) on the support shaft 2b.
After positioning in the circumferential direction, the support shaft 2b is inserted into the insertion hole 32 to engage each end of the torsion spring S with the lid 31 and the flange 7a of the tape guide 7 as shown in FIG. Stop it.

The present invention is not limited to the above-described embodiments, but various effective modifications and changes can be made based on the technical idea of the present invention.

[0028]

As described above, according to the present invention, a taper is formed on the inner peripheral surface of the insertion side opening of the insertion hole facing the support shaft so as to expand toward the insertion side opening. When inserting the support shaft, the return spring can be guided along the taper.

Therefore, even if the spring slightly deviates from the center position of the insertion hole in the radial direction and comes into contact with the opening end face, it is possible to prevent the spring from restricting the insertion of the spring by the lid, so that the support shaft is inserted into the insertion hole. It can be done smoothly.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of a tape cassette according to the present invention.

FIG. 2 is an exploded perspective view showing an entire conventional tape cassette.

3A to 3C are cross-sectional views shown for explaining a conventional procedure for attaching a lid to a case of a tape cassette.

FIG. 4 is a sectional view showing a main part of a conventional tape cassette.

[Explanation of symbols]

2 ... Base plate, 2b ... Spindle, 31 ... Lid, 32 ...
Insertion hole, 33 ... Second taper, S ... Torsion spring.

Claims (1)

[Claims] 1. A case in which a recording / reproducing head has an opening for advancing and retreating inward and a support shaft projecting to one side, and an insertion hole provided in the opening of the case so as to be openable and closable and facing the support shaft. A tape cassette comprising: a lid body; and a return spring that is locked around the lid body and the case at each end and is provided around the spindle. A tape cassette characterized in that a taper is formed on the surface of the tape so as to expand toward the opening on the insertion side.