JPH05250843A - Tape cassette - Google Patents

Abstract

PURPOSE:To obtain a stable tape traveling system. CONSTITUTION:A base plate 31 forming a part of a cassette case while being formed of a pattern plate 32 provided with a gate is formed by a molded body provided with a 1st supporting shaft 33 for holding rotation of a drive roller, 2nd supporting shafts 34, 35 for holding rotation of guide rollers and 3rd supporting shafts 36, 37 for holding rotation of reels, then axial directions of each supporting shaft 33-37 of the molded body are made to coincide with the gate opening direction in the pattern plate 32. Thus, the base plate 31 of nonanisotropy can be obtained and also the generation of precision failure in each supporting shaft 33-37 is prevented, therefore, each supporting shaft 33-37 is not tilted over as before and each roller is smoothly rotated.

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 with a predetermined interval in the left-right direction of the plate surface are supported. It is rotatably provided via shafts 4a and 5a. The front part of the case 1 (base plate 2
It is assumed that a head (not shown) for the recording / reproducing apparatus advances and retracts in the notch 2a and the second opening 3b) of the box body 3.

Reference numeral 6 denotes a lid for opening and closing the second opening 3b, which is rotatably provided around the support shaft 2b through a restoring torsion spring S. The lid 6 is provided with an insertion hole 6a facing the support shaft 2b and a concave groove (not shown) facing both ends of the torsion spring S, respectively.

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.

By the way, a tape cassette in recent years is provided with a base plate with a pin (support shaft) formed by a mold because a molded body having a complicated shape can be easily obtained and it is economical. Is proposed.

[0013]

However, in this type of tape cassette, as shown in FIG. 4, each support shaft (reel 4 ,. 5, support shafts 4a, 5a, drive roller 13, support shaft 14, and guide rollers 15, 16 support shaft 1
7 and 18) do not coincide with each other, the anisotropy is generated in the base plate 2 after the plate is formed, the precision of each support shaft is deteriorated, and each support shaft is tilted.
As a result, each roller (reel 4.5, drive roller 1
3 and the guide rollers 15 and 16) do not rotate smoothly,
There was a problem that a stable tape running system could not be obtained.

The present invention has been made in view of the above circumstances, and provides a tape cassette in which each roller can be smoothly rotated and a stable tape running system can be obtained.

[0015]

SUMMARY OF THE INVENTION A tape cassette according to the present invention comprises a base plate which is formed by a template with a gate and forms a part of a case for a cassette, and a base plate which is rotatably provided above the base plate and is mutually rotatable. It is provided with two reels arranged in parallel at a predetermined interval, and a tape wound around at least one of these reels and traveling by driving the drive belt. The base plate allows the drive roller for driving the drive belt to rotate freely. Formed by a molded body having a first supporting shaft for holding, a second supporting shaft for rotatably holding a guide roller for guiding the drive belt, and a third supporting shaft for rotatably holding the reel. The axis direction of each of the support shafts is matched with the gate opening direction in the template.

[0016]

In the present invention, it is possible to obtain a base plate having no anisotropy and prevent the occurrence of inaccuracy in each spindle.

[0017]

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

1A and 1B are a perspective view showing a base plate of a tape cassette according to the present invention and a sectional view showing a molding state of the base plate, in which the same members as those in FIG. The same reference numerals are given and detailed description is 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 the figure, the reference numeral 31 designates a base plate for a tape cassette, which is molded by a template 32 with a gate a into a substantially rectangular shape in plan view like the base plate 2.

Reference numeral 33 denotes a _first support shaft having an axis line in the mold plate 32 which coincides with the opening direction of the gate a ₁ and is integrally provided on the base plate 31 and rotatably holds the drive roller 13. Is configured to.

Reference numerals 34 and 35 denote _second support shafts having an axis line which coincides with the opening direction of the gates a ₂ and a ₃ (not shown) in the template 32, and the first support plate 31 is provided on the base plate 31.
Like the support shaft 33, it is integrally provided and is configured to rotatably hold the guide rollers 15 and 16.

Reference numerals 36 and 37 denote third support shafts having an axis line coinciding with the opening direction of the gates a ₄ and a ₅ (not shown) in the template 32, and the first support plate 31 is provided on the base plate 31.
Like the support shaft 33 and the second support shafts 34 and 35, the support shaft 33 and the second support shafts 34 and 35 are integrally formed, and are configured to rotatably hold the reels 4 and 5, respectively.

In the figure, reference numeral 32a is a support shaft forming cavity of the template 32.

In the tape cassette thus constructed, it is possible to obtain the base plate 31 having no anisotropy, and it is possible to prevent the occurrence of inaccuracy in each of the support shafts 33 to 37. This is the cavity 3 for forming each support shaft.
This is because the synthetic resin is directly injected from each gate a immediately below the cavity in the direction indicated by the arrow at the time of molding into 2a.

Therefore, in this embodiment, since the support shafts 33 to 37 do not tilt as in the conventional case, the reel 4
5, drive roller 13 and guide rollers 15 and 16
Can be rotated smoothly.

Incidentally, the recording / reproducing of the tape cassette in the present embodiment is performed by mounting the case 1 on the recording / reproducing device (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 exposed to the outside of the tape, and the capstan roller (not shown) for the recording / reproducing apparatus. ) 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.

In the present embodiment, an example in which the synthetic resin is injected from directly below the support shaft forming cavity 32a at the time of forming the plate has been shown, but the present invention is not limited to this and is shown in FIG. The support shaft forming cavity 32
Even if the synthetic resin is injected from directly above b in the direction shown by the arrow, the same effect as that of the embodiment is obtained.

In addition, 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.

[0030]

As described above, according to the present invention, the base plate, which is formed by the template with the gate and forms a part of the cassette case, rotatably holds the drive roller for driving the drive belt. 1 support shaft,
It is formed by a molded body having a second support shaft that rotatably holds a guide roller that guides the drive belt, and a third support shaft that rotatably holds a reel. Since it is aligned with the gate opening direction in the template, it is possible to obtain a base plate having no anisotropy and prevent occurrence of inaccuracy in each spindle.

Therefore, since each support shaft does not tilt as in the conventional case, the reel, the drive roller and the guide roller can be smoothly rotated and a stable tape running system can be obtained.

[Brief description of drawings]

1A and 1B are a perspective view showing a base plate of a tape cassette according to the present invention and a cross-sectional view showing a molding state of the base plate.

FIG. 2 is a cross-sectional view showing a base plate molding state in another embodiment.

FIG. 3 is an exploded perspective view showing an entire conventional tape cassette.

FIG. 4 is a cross-sectional view showing a base plate molding state of a conventional tape cassette.

[Explanation of symbols]

31 ... Base plate, 32 ... Template, 33 ... First support shaft,
34, 35 ... the second shaft, 36, 37 ... third support shaft, a ₁ ...
Gate.

Claims (1)

[Claims] 1. A base plate formed by a template with a gate and forming a part of a cassette case, and two reels rotatably provided above the base plate and arranged in parallel with each other at a predetermined interval. A first spindle for rotatably holding a drive roller for driving the drive belt, the tape being wound around at least one reel of both reels and traveling by driving a drive belt; A second support shaft that rotatably holds a guide roller that guides the belt, and a third support shaft that rotatably holds the reel.
A tape cassette formed by a molded body having a support shaft, wherein the axial direction of each support shaft of the molded body is aligned with the gate opening direction in the template.