JPS6336535Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a structure for holding a reel of an endless tape cassette.

FIG. 1 shows an endless tape cassette 1 conventionally used in VTRs.

This cassette 1 is an improved endless type tape cassette, and consists of an upper half 2 and a lower half 3. 1 reel 4 on lower half 3
The endless tape 5 wound around the reel 4 meanders randomly in the tape reservoir 6, then passes from the outlet 7 through the guide 8, through the front opening 9, and then through the guides 10 and 11. The loop then returns to reel 4. Further, a pad 13 provided on the spring member 12 is elastically pressed onto the circumferential surface of the reel 4 via the tape 5, thereby preventing the tape from being wound irregularly. Further, a pad 15 provided on the spring member 14
is elastically pressed onto the guide 8 via the tape 5, thereby giving the tape 5 a predetermined back tension. Also, the guide member 16
This guides the tape 5 so that it runs away from the reel 4 in a predetermined direction. A hole 17 is provided at the bottom of the lower half 3 into which one of the reel shafts of the VTR is inserted. Incidentally, when this endless cassette is installed in a VTR, the reel shaft is inserted into the hole 17, but this reel shaft rotates idly.

The reel 4 has a substantially cylindrical shape as shown in FIG.
When the other reel shaft of the VTR is inserted into the recess 19, the reel shaft is rotated. This reel 4 has a flange 2 at the bottom.
0 is set. Also, the above hole 1 of the lower half 3
A ring-shaped protrusion 21 is formed on the periphery of the reel 8, and when the cassette 1 is not in use, the reel 4 is supported with the flange 20 placed on this protrusion 21 as shown. A plate spring 23 made of ring bronze or the like is fitted into the upper opening 22 of the reel 4, and by pressing the center of the plate spring 23 with a protrusion 24 integrally formed on the upper half 2, the upper and lower parts of the reel 4 are moved upward and downward. I try to suppress the fluctuation of the. When the cassette 1 is used, when the reel shaft is fitted into the recess 19, the reel 4 rises slightly upward against the elasticity of the leaf spring 23, and the protrusion 2
1 and the flange 20 are slightly separated from each other. In this state, the reel shaft is rotated and the reel 4 is rotated. In this case as well, the vertical movement of the reel 4 is suppressed by the leaf spring 23 and the protrusion 24. In addition, the leaf spring 23
and protrusion 24 are also illustrated in FIG.

In the above-mentioned state of use, the axis of the reel 4 and the protrusion 24 are substantially aligned, and the reel 4 is attached to the leaf spring 2.
At this time, the projection 24 is subjected to friction due to pressure contact between the projection 24 and the leaf spring 23. Since the cassette 1 is made of a relatively soft material such as ABS resin, the projections 24 are worn out due to friction. As a result, the protrusions 24 become shorter and the pressing force decreases, causing the reel 4 to wobble up and down. In addition, scraps are generated due to wear, which accumulate in the cassette 1 and adhere to the surface of the tape 5, causing other adverse effects.

This invention is intended to solve the above problems.
Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 shows the first embodiment, and parts common to those in FIGS. 1 and 2 are given the same reference numerals.

In this embodiment, as shown in the figure, a small cylindrical protrusion 25 is provided on the upper lower surface of the upper half 2, and a low friction member 28 is elastically fitted into the small protrusion 25.

FIG. 4 shows a second embodiment, in which a small protrusion 27 is provided on the upper half 2, and a low friction member 29 having a substantially U-shaped cross section is elastically fitted into the small protrusion 27. .

The low-friction members 28 and 29 used in FIGS. 3 and 4 are made of wear-resistant and highly durable materials such as polyethylene or other ultra-high polymer materials. These materials are molded into substantially the same shape as the protrusion 24 of FIG. Incidentally, the small protrusions 25 and 27 may be omitted and the low-friction member may be fixed to the upper half 2 by bonding, ultrasonic welding, or the like.

FIG. 5 shows a third embodiment. In this case, a thin plate-like low friction member 30 is bonded to the leaf spring 23. Incidentally, the protrusion 24 shown in FIG. 2 is used.

FIG. 6 shows an example of a state in which the low friction member 30 is bonded to the plate spring 23, and this bonding may be performed, for example, via a double-sided adhesive tape.

Each of the embodiments described above is a case where the present invention is applied to an endless tape cassette for a VTR, but the present invention is used for a VTR, tape recorder, etc., and has a protrusion on the half side and a spring member on the reel side. The present invention can also be applied to endless tape cassettes of the same type as required.

The present invention is an endless reel in which a spring member (plate spring 23) attached to one end of the reel is pressed in the axial direction of the reel by a protrusion provided on the cassette half, and a tape reservoir is provided. The present invention relates to an endless tape cassette characterized in that a low-friction member is used for the protrusion or a low-friction member is interposed between the protrusion and the spring member.

Therefore, according to the present invention, it is possible to prevent the protrusions from being worn out due to the rotation of the reel as in the conventional case, and it is possible to obtain stable rotation of the reel and to protect the tape. can.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view of a conventional endless tape cassette to which the present invention can be applied, and FIG. 2 is a sectional side view of essential parts of the endless tape cassette.
3 to 5 are cross-sectional side views of essential parts of endless tape cassettes showing the first to third embodiments of the present invention, respectively;
FIG. 6 is a perspective view of a plate spring with a low-friction member adhered to it. In addition, in the symbols used in the drawings, 1...
...Endless tape cassette, 4...Reel, 2
3...Plate spring, 24...Protrusion, 28, 29, 30
...It is a low friction member.

Claims (1)

[Scope of utility model registration request] In an endless tape cassette in which a spring member attached to one end of the reel is pressed in the axial direction of the reel by a protrusion provided on the cassette half, and a tape reservoir is provided, the protrusion has a low friction An endless tape cassette characterized in that a low friction member is interposed between the protrusion and the spring member.