JPH0447831Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a reel for a tape cassette, and more particularly to a reel for a tape cassette that is incorporated into a cassette case.

2. Description of the Related Art In general, a tape cassette has a structure in which a sliding sheet is placed inside the cassette case, and the tape roll rotates while sliding on the sliding sheet. For this reason, as the tape cassette is used for a long time,
The frictional force of the sliding portion increases, resulting in poor tape running performance. In order to improve tape running performance, the present applicant previously proposed a structure in which a reel with flanges fixed to both sides of a hub was incorporated into a cassette case in Utility Application No. 59-40736 ``Tape Cassette''. He proposed a tape cassette. According to this tape cassette, good tape running properties are maintained for a longer period of time than with general tape cassettes.

By the way, in the above reel, the locking hole provided in the flange is engaged with the protrusion provided on the side end surface of the hub, the top of each protrusion is heated and crushed, and the flange is fixed by the crushed part. The structure is as follows.

Problems to be solved by the invention The flange is fixed by the part where the protrusion is crushed, but it is difficult to increase the wall thickness of this crushed part, and the wall thickness of this part generally becomes thin. For this reason, the strength of the portion where the flange is fixed to the hub tends to be weakened, and there is a problem that the flange may rattle or come off from the hub.

Therefore, a configuration can be considered in which the protrusion of the hub is shaped to have a claw-shaped locking part and the flange is locked by this locking part. With this configuration, it is necessary to temporarily bend the protrusion when locking the flange. It is possible to use the slope of the locking part to bend the protrusion when pressing the flange against the hub, but in this case, it is necessary to press the flange with strong force, so there is a risk that the flange will warp. However, there is a problem in that it is difficult to attach the flange smoothly.

The object of the present invention is to provide a reel for a tape cassette that solves the above problems.

Means for Solving the Problem The present invention has a plurality of axial through holes 16 formed around the hub 2 so as to pass through the hub in the axial direction; It is fixed to the inner wall surface of the axial through hole across the circumferential direction, and the tip side is connected to the side end surface 2a of the hub.
a plurality of support parts 15 that protrude further and are provided in the axial through hole; and a locking part that is provided at the tip of the support part 15 and locks a portion of the flange facing the locking hole. 17, and is provided at the tip of the support portion 15 and protrudes on the opposite side from the locking portion 17, so that the locking portion is inserted through the locking hole when the flange is attached to the hub. The supporting part 15 is considerably wider than the locking part 17 and the operated part 18, and the supporting part 15 is considerably wider than the locking part 17 and the operated part 18. The locking portion 17 locks the flange 3 by being elastically bent in its longitudinal direction and elastically bent in its width direction.

Embodiment Next, an embodiment of the tape cassette reel of the present invention will be described.

As shown in FIGS. 1 and 2, the tape cassette reel 1 has a structure in which flanges 3 and 4 are attached to the upper and lower surfaces of a hub 2, and a cassette formed by combining cassette halves 5a and 5b. Two are installed in the case 5 side by side. In Figure 2, 6
7 is a magnetic tape, and 7 is a tape roll.

The hub 2 has three protrusions 8a to 8c on one side end surface (upper surface) 2a and three protrusions 9a to 9c on the opposite side end surface (lower surface) 2b. Projection 8a on the top surface
8c and the protrusions 9a to 9c on the lower surface are arranged at equal angular intervals so as to be offset in the circumferential direction.

The flanges 3 and 4 have locking holes 10a to 10, respectively.
c, 11a to 11c and opening windows 12a to 12c,
13a to 13cga are formed. Flange 3 is
The protrusions 8a to 8a correspond to the locking holes 10a to 10c, respectively.
8c, the flange 4 is engaged with the engagement hole 11a.
11c are engaged with corresponding projections 9a to 9c, respectively, and fixed to both end surfaces 2a and 2b of the hub 2.

The shape and structure of the protrusion 8a will now be explained with reference to FIGS. 3, 5, 7, and 8.

Reference numeral 15 denotes a support portion, which is connected to the axial through hole 1 of the hub 2.
It protrudes by a dimension H across the upper end opening of 6 and above the side end surface 2a. This support portion 15 is plate-shaped and extends across the through hole 16 in the circumferential direction of the hub 2 (direction of arrow Y).

The protrusion 8a is a locking part 1 that protrudes from the upper part of the support part 15 in the outer circumferential direction of the hub 2 (in the direction of arrow X ₂ ).
7, and an operated portion 18 protruding from the upper part of the support portion 15 toward the center of the hub 2 (in the direction of arrow _X1 ). The locking portion 17 has an inclined upper surface 17a, and is formed to have an interval A equal to the thickness T of the flange 4 between the lower surface and the side end surface 2a of the hub 2. Further, the operated portion 18 has a recess 18a on the upper surface. The locking hole 10a has a size and shape that allow the locking portion 17 and the operated portion 18 to be inserted therethrough.

The width of the support portion 15 is approximately three times as large as the width of the locking portion 17 and the operated portion 18 .

Thereby, the support portion 15 is bent not only in the longitudinal direction but also in the width direction.

In the longitudinal direction, the support portion 15 is bent as shown by the two-dot chain line in FIG.

In the width direction, the support portion 15 bends in an arcuate shape as shown by the two-dot chain line in FIG.

By bending in two ways in this way, the locking portion 1
7 in the direction of the center of the hub.

The other protrusions 8b, 8c, 9a to 9c have the same shape as the above-mentioned protrusion 8a, and their explanation will be omitted.

Next, the operation of the protrusion 8a when attaching the flange 3 to the hub 2 and the state in which the flange 3 is attached will be explained with reference to FIGS. 4 and 6.

The flange 3 is attached to the hub 2 by an automatic machine. First, the flange 3 is placed on the side end surface 2a of the hub 2 with its locking holes 10a to 10c facing the protrusions 8a to 8c. Flange 3 is
As for the locking hole 10a, as shown in FIG.
a, and the other locking holes 10b and 10c are similarly maintained.

In this state, the push rod 19 of the automatic machine descends, engages with the recess 18a of the operated part 18, and pushes it downward. As a result, the support portion 15 is bent as shown by the two-dot chain line in FIG. 5 and the two-dot chain line in FIG. ₈ , the protrusion 8a is displaced in the direction of arrow It comes off the edge of the stop hole 10a,
Both the locking portion 17 and the operated portion 18 enter inside the locking hole 10a in the plan view. The other protrusions 8b and 8c similarly fit inside the locking holes 10b and 10c in the plan view. As a result, the flange 3 has the protrusion 8a,
The support by 8b and 8c is released, and each locking hole 10
a to 10c are fitted with the corresponding projections 8a, 8b, 8c, and the flange 3 is lowered to the side end surface 2a of the hub 2.
comes into contact with.

After this, the push rod 19 rises. As a result, the support portion 15 is elastically restored, and the protrusion 8a is
The locking portion 17 is displaced in the _X2 direction, and locks the upper surface of the portion _10a1 of the flange 3 facing the locking hole 10a, as shown in FIGS. 4 and 6. Other protrusion 8
Similarly, locking holes 10 of the flange 3 are also used for b and 8c.
The portions 10b ₁ and 10c ₁ facing b and 10c are locked. This allows the flange 3 to
a ₁ , 10b ₁ , and 10c ₁ are locked and fixed on the side end surface 2a of the hub 2.

Another flange 4 is also fixed on the side end surface 2b of the hub 2 in the same manner as above.

As described above, the flanges 3 and 4 are sufficiently firmly fixed because the portions facing the respective locking holes are locked by the projections 8a to 8c and 9a to 9c. Also, when installing flanges 3 and 4,
Since the flanges 4 are not pressed too hard, there is no risk of the flanges 3 and 4 warping. Further, since the operated portion 18 is specially provided, it is easy to bend the support portion 15, and the flanges 3 and 4 can be attached with good work efficiency.

Effects of the Invention As described above, according to the tape cassette reel of the present invention, the support portion can be formed without damaging the shape of the outer periphery of the hub. Also,
Because the support part flexes not only in the longitudinal direction but also in the width direction,
Even if the hub is small in height, it is possible to form a support portion that can be elastically bent to a large extent. Further, since the projection is provided at the tip of the support part, and the projection is provided with an operated part to which an operating force is applied to bend the support part, the operation to bend the support part is facilitated. Moreover, it can be done reliably, the flange can be attached to the hub with good work efficiency, and the flange can be fixed firmly enough, and the flange can be made of synthetic resin. It has the advantage that it can be a flexible flange or a rigid flange such as a metal plate.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of an embodiment of the tape cassette reel of the present invention, FIG. 2 is an exploded perspective view of a tape cassette incorporating the tape cassette reel of FIG. 1, and FIG. FIG. 4 is an enlarged perspective view showing a state in which a flange is locked by one projection, and FIG. Fig. 3 is a cross-sectional view taken along line - in Fig. 4, and Fig. 6 is a cross-sectional view taken along line - in Fig. 4;
The figure is a cross-sectional view taken along the line - in FIG. 3, and FIG. 8 is a plan view around the support portion in FIG. 3. 1... Reel for tape cassette, 2... Hub,
2a, 2b...Side end surface, 3, 4...Flange, 5
...Cassette case, 5a, 5b...Cassette half, 6...Magnetic tape, 7...Tape winding body,
8a-8c, 9a-9c...protrusions, 10a-10
c, 11a to 11c...Lock hole, 10a ₁ to 10c ₁
... Portion facing the locking hole, 15 ... Support part, 16 ...
...through hole, 17...locking part, 17a...slanted surface,
18...Operated portion, 18a...Concave portion, 19...Push rod.

Claims (1)

[Claims for Utility Model Registration] In a reel for a tape cassette, the flange is attached to the hub by engaging a locking hole of the flange with a protrusion provided on the hub, the hub being attached to the periphery of the hub 2. A plurality of axial through holes 16 are formed to penetrate in the direction, and a base side is fixed to an inner wall surface of the axial through hole 16 across the axial through hole 16 in the circumferential direction of the hub, and a tip end thereof is fixed to the inner wall surface of the axial through hole 16, and The side is the side end surface 2a of the hub
a plurality of support parts 15 that protrude further and are provided in the axial through hole; and a locking part that is provided at the tip of the support part 15 and locks a portion of the flange facing the locking hole. 17, and is provided at the tip of the support portion 15 and protrudes on the opposite side from the locking portion 17, so that the locking portion is inserted through the locking hole when the flange is attached to the hub. The supporting part 15 is considerably wider than the locking part 17 and the operated part 18, and the supporting part 15 is considerably wider than the locking part 17 and the operated part 18. being elastically deflected in its longitudinal direction and elastically deflected in its width direction;
A reel for a tape cassette in which the locking portion 17 locks the flange 3.