JPS6215912Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a tape guide used in tape cassettes and the like.

In tape cassettes such as audio cassettes and video cassettes, it is necessary to prevent the tape from loosening during tape running and to smoothen the running of the tape. For this purpose, a tape guide is installed on the tape surface within the cassette. Sliding arrangement is performed.

Conventionally, as shown in FIG. 1, the tape guide described above has a low-friction plastic film 2' such as a fluororesin film at the tip of a sheet-like arm 1'.
A running tape T' has a sliding contact portion attached thereto. In this tape guide, in order to attach the low-friction plastic film 2' to the tip of the sheet-like arm, it is necessary that the pressure-sensitive adhesive exhibits sufficient adhesive strength even if it is a fluororesin film, Pressure-sensitive adhesives (3' in FIG. 1) are generally used because they are superior in workability compared to melt-type adhesives.

However, in such tape guides, during long-term use, there have been cases where the pressure-sensitive adhesive leaks from the edge of the low-friction plastic film and adheres to the running tape, impeding the smooth running of the tape. It happens often.

The tape guide according to the present invention was devised in view of the above-mentioned points, and a low-friction plastic film is attached to the tip of the sheet-like arm using a pressure-sensitive adhesive layer, and the sliding contact area of the running tape is established,
This structure is characterized in that the end surface of the pressure-sensitive adhesive layer facing the edge of the low-friction plastic film that is in contact with the running tape is covered with a non-adhesive solidified material.

The present invention will be explained below with reference to the drawings.

In FIG. 2, 1 is a sheet-like arm.
2 has a pressure-sensitive adhesive layer 3 on the tip of the sheet-like arm 1;
For example, a low-friction plastic film attached via double-sided adhesive tape.

The sheet-like arm 1 is fixed at its rear end 11 in the cassette by double-sided adhesive tape, pins, etc. The tape T slides on and contacts a low-friction plastic film 2 attached to the tip of the sheet-like arm. The sheet-like arm 1 is made of a sheet having a high rigidity that repels the contact force during tape running and does not loosen the tape, such as a plastic sheet of polyethylene terephthalate, polycarbonate, etc., a thin metal plate, or a laminated sheet of these.

As the low friction plastic film 2, a fluororesin film, a polyethylene film, an ultra-high molecular weight polyethylene film, etc. are used.

In FIG. 2, 4, 4 is a seal made of non-adhesive solidified material that covers the end surface of the pressure-sensitive adhesive layer, and this seal reliably eliminates leakage of the adhesive 3 from the edges 20, 20 of the low-friction film. . This sticker 4
In addition to applying paint or heating and melting plastic, there is a method in which a crosslinking agent is added to the adhesive of the adhesive layer and crosslinking is carried out by irradiating the end surface of the adhesive layer with actinic rays or radiation. A method of crosslinking by applying actinic rays or radiation to a crosslinking agent can be used.

In the present invention, the seal 4 is essential to the adhesive layer end facing the low friction plastic film edge 20 with which the running tape T comes into sliding contact. As shown in FIG. 3, which shows the - cross section of FIG.
This seal is important when the difference between the width of the low friction plastic film 2 and the width of the running tape T is small.

FIG. 4 shows another embodiment of the present invention, in which a low-friction plastic film 2 is attached to the tip of a sheet-like arm 1 in a U-shape via an adhesive layer 3, and a running tape T
The above-mentioned seal 4 is applied to the adhesive layer end of the film edge 20 that comes into sliding contact with the film.

In this other embodiment as well, sealing at both ends of the width of the film 2 may be performed as necessary, as described above, and the sealing at both ends of the width of the film 2 may be performed as necessary. A seal 4 can be applied.

The tape guide according to the present invention can be manufactured by punching. That is, a large number of tape guides can be manufactured by punching from a tape guide base material in which a low-friction film base material is adhered to a sheet-like arm base material through an adhesive layer. In this case, it is possible to apply the above-described seal in advance before punching.

As described above, the tape guide according to the present invention is a tape guide in which a low-friction plastic film is attached to the tip of a sheet-like arm using a pressure-sensitive adhesive layer, and the edge of the low-friction plastic film is in sliding contact with the running tape. Since the edges of the pressure-sensitive adhesive layer are sealed with a non-adhesive solidifying material, leakage of the pressure-sensitive adhesive from the edge of the film can be reliably prevented, and interference with tape running due to adhesion of this leaked adhesive can be eliminated. Therefore, smooth tape running can be ensured over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a conventional tape guide, FIG. 2 is an explanatory diagram showing a tape guide according to the present invention,
Figure 3 is a cross-sectional explanatory diagram of Figure 2;
The figure is an explanatory diagram showing another embodiment of the present invention. In the figure, 1 is a sheet-like arm, 2 is a low-friction plastic film, 20 is an edge of the film, and 3 is a low-friction plastic film.
is a pressure-sensitive adhesive layer, and 4 is a non-tacky solidified material.

Claims (1)

[Scope of utility model registration request] A low-friction plastic film is attached to the tip of the sheet-like arm using a pressure-sensitive adhesive layer to provide a sliding contact area for the running tape, and the end face of the pressure-sensitive adhesive layer faces the edge of the low-friction plastic film that is in contact with the running tape. A tape guide in a tape cassette characterized in that it is covered with a non-adhesive solidified material.