JPH05258500A - Tape cassette - Google Patents

Abstract

PURPOSE:To obtain a stable tape traveling system. CONSTITUTION:A base plate 31 is formed of a molding having supporting shafts 32, 33 respectively freely rotatably holding reels 4, 5. The outside diameters of the respective supporting shafts 32, 33 of this molding is set at the sizes larger than the thickness of the base plate. The respective supporting shafts 32, 33 of the base plate 31 are reinforced and, therefore, the tilting of the supporting shafts 32, 33 is prevented and the respective reels 4, 5 are 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 at the rear of the reels 4 and 5 and at the rear end edge of the base plate 2 respectively.
7 and 18 are arranged side by side.

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, as a tape cassette in recent years, a tape cassette provided with a base plate molded by a mold has been proposed because a molded body having a complicated shape can be easily obtained and it is economical.

[0013]

However, in the tape cassette of this type, if the plate thickness of the base plate 2 is set to a uniform size in all parts, it will be difficult to solve the problem shown in FIG.
As shown in, each spindle was tilted depending on the load. In particular, the spindles 4a and 5a of the reels 4 and 5 are required to have strictness with respect to verticality. As a result, there is a problem that the reels 4 and 5 do not rotate smoothly and a stable tape running system cannot be obtained.

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

[0015]

A tape cassette according to the present invention comprises two reels which are rotatably provided above a base plate and arranged in parallel with each other at a predetermined interval, and at least one of the two reels. In a tape cassette equipped with a tape which is wound and runs by the drive of a drive belt,
The reel is formed by a molded body having a support shaft that holds the reel rotatably, and the outer diameter of the support shaft of the molded body is set to be larger than the thickness of the base plate.

[0016]

In the present invention, the support shaft of the base plate can be reinforced to prevent the support shaft from tilting.

[0017]

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

FIG. 1 is an exploded perspective view showing the internal structure of the tape cassette according to the present invention, and FIG. 2 is a sectional view showing the base plate of the tape cassette according to the present invention, in which the same or equivalent members as in FIG. 3 are shown. Are denoted by the same reference numerals, and detailed description will be omitted. Further, in the description of the embodiment, the same or equivalent members as those used in the description of the conventional example are designated by the same reference numerals.

In FIG. 1, reference numeral 31 denotes a base plate for a tape cassette, which is formed by a template plate (not shown) with a gate into a substantially rectangular shape in plan view like the base plate 2. This base plate 3
The reference numeral 1 designates both reels 4 and 5 which are rotatably held respectively.
It is formed by a molded body made of synthetic resin having two support shafts 32, 33. And this base plate 3
The outer diameter L of each of the support shafts 32 and 33 of No. 1 is the base plate thickness t
It is set to a larger size.

In the tape cassette thus constructed, the support shafts 32 and 33 of the base plate 31 can be reinforced.

Therefore, in this embodiment, since the support shafts 32 and 33 can be prevented from tilting, the reels 4 and 5 can be smoothly rotated.

Incidentally, the recording / reproducing of the tape cassette in this 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, and the magnetic tape 12 presses against the head (not shown) for the recording / reproducing apparatus at the tape external exposure position, 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 this embodiment, the reels 4, 5 are
Although an example in which the outer diameters of the support shafts 32 and 33 are set to be larger than the base plate thickness, the present invention also sets the outer diameters of the other support shafts to be larger than the base plate thickness in the same manner as the outer diameters of the support shafts 32 and 33. There is no problem even if you set the dimensions.

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.

[0026]

As described above, according to the present invention, the base plate is formed by the molded body having the spindle for rotatably holding the reel, and the outer diameter of the spindle of the molded body is larger than the thickness of the base plate. Since the dimensions are set, each support shaft of the base plate can be reinforced.

Therefore, since the support shafts can be prevented from tilting, the reels can be smoothly rotated and a stable tape running system can be obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an internal structure of a tape cassette according to the present invention.

FIG. 2 is a sectional view showing a base plate of the tape cassette of the present invention.

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

FIG. 4 is a cross-sectional view showing an example of a defective attachment of a reel spindle of a conventional tape cassette.

[Explanation of symbols]

4, 5 ... Reel, 12 ... Magnetic tape, 31 ... Base plate, 32, 33 ... Spindle.

Claims (1)

[Claims] 1. A reel rotatably provided above a base plate and arranged in parallel with each other at a predetermined interval, and a tape wound around at least one of the reels and driven by a drive belt. In the tape cassette provided with, the base plate is formed by a molded body having a supporting shaft that rotatably holds the reel, and the outer diameter of the supporting shaft of the molded body is set to a dimension larger than the thickness of the base plate. And tape cassette.