JP2528476Y2 - Tape recorder reel receiver - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel receiver for a tape recorder which is rotatably supported by simply being inserted into a reel support shaft.

[0002]

2. Description of the Related Art A reel receiver of a tape recorder which is rotatably supported simply by being inserted into a reel support shaft is disclosed in, for example, Japanese Utility Model Laid-Open No. 62-186241 and Japanese Utility Model Laid-Open No. 61-111043.
No., it has been proposed in Japanese Utility Model 62-8323 No. 5. The reel receiving structure shown in Japanese Utility Model Laid-Open No. 62-186241,
A metal reel mounted on a substrate, comprising a sleeve having a bearing portion formed of a relatively hard synthetic resin, and a reel driving member press-fitted and held in the sleeve, provided with an engagement projection at the tip of the sleeve, and mounted on the substrate. The sleeve is inserted into the support shaft, the engagement protrusion is engaged with the annular groove formed at the tip of the reel support shaft, and the reel receiver is rotatably supported on the substrate so as to prevent the reel receiver from coming off.

[0003] Also, Japanese Utility Model Laid-Open No.
A fork-shaped reel support shaft having a locking portion at the tip is integrally formed on a synthetic resin substrate, and the shaft hole of the reel support is inserted so as to narrow the fork of the reel support shaft. 2 shows a reel receiving structure in which the bifurcated reel support shaft is opened when it protrudes from the front end of the reel receiving member, and the locking portion restricts the reel receiving from coming off.

[0004] Further, Japanese Utility Model 62-8323 No. 5, the tip integrally molded to the chubby reel support shaft made of a synthetic resin substrate having an engaging hole, the other hand, the engaging in the shaft hole of the reel receiver A locking claw that fits into the hole is provided, and when the shaft hole of the reel receiver is inserted into the reel support shaft, the locking claw is fitted into the engagement hole to restrict the reel receiver from coming off. 3 shows a reel receiving structure.

[0005]

[Problem to be solved by the present invention]
The engaging projection disclosed in Japanese Patent No. 186341 is an extremely small one for fitting into an annular groove formed on a reel support shaft generally having a diameter of about 2 mm, is difficult to form, and has a strength to prevent slipping. Is also weak.

In Japanese Utility Model Laid-Open Publication No. 61-111043, the reel support shaft has a bifurcated shape, so that the strength of the reel support shaft itself is weak, and the reel receiver is provided with the bifurcated reel support shaft narrowed. Workability was poor due to the need to attach.

Further to that shown in Japanese Utility Model 62-8323 No. 5, a problem that the lateral pressure from the radial direction is applied it is necessary leave chubby reel supporting shaft rotational resistance of the receiving reel becomes higher there were. An object of the present invention is to provide a tape recorder reel receiver that solves such a problem, has good workability, has sufficient retaining strength, has good workability, and has low rotational resistance.

[0008]

The reel receiver of the tape recorder according to the present invention has an annular groove formed on an outer peripheral surface of a reel support shaft, and a reel receiver body having a bearing portion fitted to the reel support shaft. A cylindrical locking portion is provided to fit in the annular groove and support the reel receiving body on the reel support shaft so as to prevent the reel receiving body from coming off, and the outer peripheral surface of the cylindrical locking portion is parallel to the axis of the reel receiving body. It is characterized in that a V groove is provided.

[0009]

With such a structure, when the reel support shaft is inserted into the bearing portion of the reel receiving body, the locking portion is pushed out by the reel support shaft and the bottom of the V-groove is broken to support the reel. After the shaft is inserted, it is elastically restored and fitted into the annular groove, so that the reel receiver is firmly prevented from coming off.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a reel receiver of a tape recorder according to an embodiment of the present invention will be described with reference to the drawings. FIG.
Shows the cross-sectional structure of the reel receiver according to the embodiment,
Is a substrate of the tape recorder. On this substrate 1, a reel supporting shaft 2 made of a long and small diameter cylindrical body (for example, 2 mm in diameter) made of soft iron is protruded by caulking or the like. An annular groove 3 formed by cutting or header processing is provided on the outer periphery of the distal end of the reel support shaft 2, and a flange for attaching the reel shaft 2 to a substrate vertically is provided at the base end thereof. (Flange) portion 4 is provided.

On the other hand, a synthetic resin reel receiving body 5 rotatably mounted on the reel support shaft 2 comprises a cylindrical bearing portion 6 rotatably fitted on the reel support shaft 2,
A cylindrical reel receiving portion 7 provided coaxially outside the bearing portion 6 and fitted with a reel hub (not shown) of the tape cassette is mainly constituted. The bearing portion 6 and the reel receiving portion 7 are connected and integrated by a cylindrical connecting portion 9 having an opening 8 formed above the bearing portion 6 with its upper end closed.

The space between the bearing portion 6 and the reel receiving portion 7 is formed with high dimensional accuracy, specifically, by making the thickness of the bearing portion 6 uniform and making the inner diameter thereof constant. It is for processing. And the bearing 6 in this space portion
As shown in FIG. 2, a plurality of ribs 10 are provided at equal intervals in the circumferential direction between the reel receiving portion 7 and the reel receiving portion 7 to compensate for the insufficient strength of the reel receiving main body 5 due to the space. I have.

At the lower end of the reel receiving portion 7, a large-diameter disk 11 having gear teeth formed therearound is provided. Further, on the peripheral surface of the reel receiving portion 7, as shown in FIG.
2 are provided in plurality.

At the upper end of the bearing 6 inside the opening 8, a cylindrical locking portion 13 fitted into the annular groove 3 is provided coaxially. The inner wall surface of the locking portion 13 and the inner wall surface of the bearing portion 6 are connected via a tapered surface whose inner diameter is narrowed upward.

Here, the feature of the reel receiver according to the present invention is that a plurality of V-shaped grooves 14 are provided on the peripheral surface of the locking portion 13 in parallel with the axial direction thereof. In this embodiment, the V-shaped grooves 14 are formed at equal intervals in the circumferential direction of the locking portion 13.
It is provided at the location of the location.

As shown in FIG. 3 (a), when the reel receiving body 5 is fitted into the reel supporting shaft 2 from above and integrated therewith, as shown in FIG. Receives a force that contacts the inner wall tapered surface of the locking portion 13 and pushes the locking portion 13 outward, breaking the thin portion at the bottom of the groove and moving the locking portion 13 outward. This facilitates elastic deformation. When the locking portion 13 gets over the head of the reel support shaft 2 due to this elastic deformation, FIG.
As shown in (b), the elastic return action fits into the annular groove 3 to restrict the reel receiving body 5 from coming off from the reel support shaft 2.

In place of the V-shaped groove 14, an elongated slit may be formed on the peripheral wall of the locking portion 13 in advance. However, since the locking portion 13 itself has a very small diameter, it is generally very difficult to integrally mold the reel receiving body 5 with synthetic resin with high accuracy. For example, if a slit is provided in the locking portion 13, the material protrudes from the inner diameter surface of the cylinder at the time of molding, so-called burrs are likely to occur.

In this regard, in order to provide the V-shaped groove 14 on the peripheral surface of the locking portion 13, it is only necessary to form a projection corresponding to the V-shaped groove by, for example, electric discharge machining in the mold. Part 1
Since the inner diameter surfaces of the cylinders 3 are connected seamlessly, the above-described problem of the occurrence of burrs is eliminated. As a result, the reel receiving body 5 having the above-described shape can be integrally formed with high precision.

Thus, according to the reel receiver configured as described above, the reel itself can be formed easily and with high precision. Moreover, since the cylindrical locking portion 13 can be fitted over the entire circumference of the annular groove 3, the retaining strength thereof can be sufficiently increased.

Since the reel supporting shaft is not provided with a locking portion as in the prior art, the diameter of the reel supporting shaft 2 is reduced, and the inner diameter of the bearing portion 6 for rotatably supporting the reel supporting shaft 2 is also reduced. As a result, the rotational contact resistance there can be reduced.

The present invention is not limited to the above embodiment. Although two V-shaped grooves 13 are provided in the embodiment,
It is also possible to provide three or more locking members 13 as long as the strength is not impaired. Further, here, a connecting portion 15 is provided between the locking portion 13 and the bearing portion 6 for facilitating the bending of the locking portion 13. What is necessary is just to determine according to specifications, such as. Further, the fitting shape between the annular groove 3 and the locking portion 13 can be variously modified.

[0022]

According to the reel receiver having the above-mentioned structure, since the locking portion is cylindrical and has no slit as in the prior art, no burrs are generated at the time of forming, so that the formability is good. In addition, the entire circumference of the cylindrical inner diameter of the locking portion enters the annular groove, so that sufficient retaining strength can be obtained. Furthermore, the bearing can be mounted simply by pushing the bearing portion of the reel holder into the reel support shaft, and the diameter of the bearing hole fitted with the reel support shaft can be reduced, so that the rotation resistance is reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional perspective view taken along line AA of FIG. 1;

FIG. 3 is a sectional view of a main part of the embodiment.

[Explanation of symbols]

 2 Reel support shaft 3 Annular groove 5 Reel receiving body 6 Bearing part 13 Cylindrical locking part 14 V groove

Claims (1)

(57) [Scope of request for utility model registration] A reel support shaft having an annular groove on its outer peripheral surface; a reel support body made of a synthetic resin having a bearing fitted to the reel support shaft; A cylindrical locking portion (1) which is provided integrally with the reel receiving body, fits into the annular groove, and retains the reel receiving body on the reel support shaft.
And 3); and a said reel receiving V grooves provided along the axial line direction of the main body on the outer peripheral surface of the cylindrical locking portion (14), before
The cylindrical locking portion connects the bearing portion of the reel receiving body to the rib.
When mounted on the reel support shaft, it is spread by the reel support shaft.
After the lower part of the V-groove is broken,
A reel receiver for a tape recorder, which is fitted in an annular groove .