JP2525811Y2 - Tape cassette - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a tape cassette,
More specifically, the present invention relates to a tape cassette which facilitates rotation of a supply / winding hub and running of a magnetic tape so as to prevent disturbance of winding of the magnetic tape.

[0002]

2. Description of the Related Art As a tape cassette, two sliding sheets called friction sheets are mounted in a cassette body, and a magnetic tape and a supply / winding hub around which the magnetic tape is wound are sandwiched between the sliding sheets. There is known a magnetic tape in which the running of a magnetic tape and the rotation of the supply / winding hub are smooth, and the winding of the magnetic tape is prevented from being disturbed.

Conventionally, as the above-mentioned sliding sheet, a flat sheet not subjected to embossing (bulging) or a sheet having a plurality of bulging portions with a constant width formed by embossing is used.

[0004]

However, a tape cassette equipped with a flat sliding sheet that has not been embossed may not sufficiently exhibit the effect of the sliding sheet, and may cause the magnetic tape to be wound up. Was.

[0005] Further, a tape cassette equipped with a sliding sheet formed by embossing and forming a plurality of bulges having a constant width has a small width when the bulges are narrow. The edge of the magnetic tape may be damaged, and if the bulging portion is wide, the winding of the magnetic tape may be disturbed.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a tape cassette which does not cause the winding of the magnetic tape to be disturbed and does not damage the edge of the magnetic tape.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, the width of the bulging portion provided on the sliding sheet has been changed between the both ends in the longitudinal direction and the central portion in the longitudinal direction. It has been found that by making the difference, the winding of the magnetic tape is not disturbed and the edge of the magnetic tape is not damaged. The present invention has been made based on the above findings, and a pair of supply and take-up hubs around which a magnetic tape is wound are rotatably housed in a cassette main body, and the supply and take-up hubs of the pair are supplied. In a tape cassette having, on the surface thereof, a sliding sheet having a pair of holes that engage with the pair of supply / winding hubs, a position of the magnetic tape at a position on the front side of the cassette body of the sliding sheet. A linear bulge is provided in contact with the edge and extending parallel to a line connecting the pair of holes, and the bulge is drawn out of the magnetic tape.
It is an object of the present invention to provide a tape cassette characterized in that the tape cassette is formed so as to become wider as approaching the end on the winding side.

[0008]

According to the tape cassette of the present invention, the wide portion of the bulge formed on the sliding sheet guides the magnetic tape pulled out from the supply / winding hub and wound. Further, a narrow portion of the bulging portion supports the magnetic tape wound around the supply / winding hub.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the tape cassette according to the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the tape cassette of the present invention. FIG. 1 is a plan view showing the inside of the lower half of the cassette body, FIG. 2 is a plan view of a sliding sheet, and FIG. FIG. 3 is a sectional view taken along line III-III of FIG. 2.

As shown in FIG. 1, the tape cassette according to the present embodiment has a pair of supply / winding units each having a magnetic tape 3 wound in a cassette body 1 having an upper half (not shown) and a lower half 2. The take-up hubs 4 and 5 are rotatably housed, and are located between the inner surface of the upper half and one surface of the supply / take-up hubs 4 and 5 and the inner surface of the lower half 2 and the supply / take-up hub 4. The sliding sheet 6 is mounted between the other surfaces of the sliding sheets 6 and 5, respectively.

The sliding sheet 6 is, for example, a surface of a base film made of polyethylene terephthalate, ultra-high molecular weight polyethylene or the like and having a thickness of about 40 μm to 100 μm (contact with the supply and take-up hubs 4 and 5 and the magnetic tape 3). (Surface) is formed by forming a carbon material or the like as a lubricant in a thin film shape.

The sliding sheet 6 is provided with a pair of holes 6a and 6b which engage with the supply and take-up hubs 4 and 5, respectively.
Further, bulging portions 6c and 6d extending in parallel with a line connecting the holes 6a and 6b are provided by embossing. These bulging portions 6c and 6d are in contact with the edge of the magnetic tape 3, and one bulging portion 6c located on the front portion (upper portion in FIG. 1) of the cassette main body 1 is It is formed so that it becomes wider as it approaches the end on the drawer side or the winding side. That is, the longitudinal end portion 6c ₁ of the expanded portion 6c, it is formed so as to be wider toward the edge of the bulging portion 6C. Longitudinal central portion 6c ₂ of the width of the bulging portion 6c longitudinal end portions 6c ₁
It is formed narrower and substantially constant.

[0014] In this embodiment, as shown in FIG. 2, the longitudinal end upper the longitudinal central portion of the portion 6c ₁ 6
By inclining at an angle θ with respect to c _2, the longitudinal direction end portion 6c ₁ is formed so as to be wider toward the end of the drawer side and the take-up side of the magnetic tape 3.

Here, the angle θ is 10 ° to 20 °.
To, the width A of the longitudinal central portion 6c ₂ is 1mm~4m
the m, also the length B of the longitudinal end portions 6c _1, 9m
the M～13mm, and the maximum width C of the longitudinal end portions 6c ₁ is preferably set to the 3 mm to 7 mm.

In addition, bulging portions 6e are formed at both left and right sides of the holes 6a and 6b.

In the tape cassette of the present embodiment constructed as described above, the magnetic tape 3 wound around the supply / winding hubs 4 and 5 is formed by using a narrow longitudinal portion of the bulging portion 6c provided on the sliding sheet 6. supported by center section 6c _2, also drawn from the supply and take-up hub 4 and 5, the magnetic tape 3 is wound,
To guide sliding sheet width of the bulging portion 6c provided on the 6 wider longitudinal end portion 6c _1, prevents irregular winding of the magnetic tape 3, also pull the edge of the magnetic tape 3, damage upon winding afraid There is no.

[0018] Incidentally, the other protruding portion 6d supports the magnetic tape 3 wound around the supply and take-up hub 4 and 5, the magnetic tape 3 together with the longitudinal central portion 6c ₂ of one of the bulging portion 6c
To prevent turbulence.

The tape cassette of the present invention is not limited to the one shown in the above embodiment. In short, the bulge,
The magnetic tape may be formed so as to become wider as it approaches the end on the side where the magnetic tape is pulled out or wound.

[0020]

As described above, the tape cassette of the present invention has no magnetic tape turbulence and does not damage the edges of the magnetic tape.

[Brief description of the drawings]

FIG. 1 is a plan view showing the inside of a lower half of a cassette body.

FIG. 2 is a plan view of a sliding sheet.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cassette main body 2 Lower half 3 Magnetic tape 4, 5 Supply / winding hub 6 Sliding sheet 6a, 6b Hole 6c Swelling part 6c ₁ Both ends in longitudinal direction 6c ₂ Central part in longitudinal direction

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 52-81815 (JP, U) JP-A 3-14790 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A pair of supply / winding hubs around which a magnetic tape is wound are rotatably housed in a cassette main body, and the pair of supply / winding hubs are mounted on surfaces of the pair of supply / winding hubs. In a tape cassette having a sliding sheet having a pair of holes to be engaged with a take-up hub, a position of the sliding sheet on the front side of the cassette body is in contact with an edge of the magnetic tape, and the pair of holes is A linear bulging portion extending parallel to a line connecting the portions, wherein the bulging portion is formed so as to become wider as approaching the end on the side where the magnetic tape is pulled out and wound. Tape cassette.