JPH0743788Y2 - Tape recorder reel drive - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention aims to improve the assembly accuracy, simplify the configuration, and reduce the number of parts, and at the same time, it is a tape recorder that can be automatically mounted on a chassis. Of the reel driving device.

(Prior Art) Generally, a reel drive device of a tape recorder is provided with an engagement ridge that engages with a plurality of engagement projections on an inner peripheral surface of the reel hub on the outer periphery of the reel receiver, and transmits the rotation to the reel receiver so that the reel hub is rotated. It is designed to rotate. When the reel hub is mounted on the reel receiver, even if the engagement protrusion of the reel hub comes into contact with the tip of the engagement protrusion on the reel receiving side, the reel hub can be driven without any trouble.
Those disclosed in Japanese Utility Model Publication No. 56-35969 and Japanese Utility Model Publication No. 64-2278 are known. That is, when the engaging projection of the reel hub comes into contact with the tip of the engaging projection, the engaging projection is once pushed down, and when the reel receiver starts to rotate, the tip of the engaging projection is disengaged from the engaging projection and spring force is applied. As a result, ascends and returns to engage with each other in the rotational direction.

(Problems to be solved by the invention) In the former of the above-mentioned conventional device (Japanese Utility Model Publication No. 56-35969), the reel base is rotatably fitted to the fixed shaft protruding from the chassis, and Fit the retaining ring on the upper end,
After the spring is loaded on the reel base, a receiving member, which is a reel receiver integrally provided with an engaging projection on the outer peripheral surface, is pushed in to assemble.

In the latter of the above-mentioned conventional devices, the reel base is rotatably fitted to the fixed shaft protruding from the chassis, the spring is fitted to the reel base, and the spring is compressed to the outer peripheral surface. A reel drive body that is a reel receiver integrally provided with a drive projection that is an engaging projection is fitted to a reel base and a fixed shaft, and a retaining ring is fitted to the upper end of the fixed shaft to assemble.

Thus, in any of the above, the reel stand and the reel receiver are separate bodies. Therefore, since none of the above-mentioned conventional devices can be mounted on the shaft erected on the chassis in an assembled state in advance, automatic mounting on the chassis is difficult.

Moreover, due to the existence of the gap between the reel stand and the reel receiver, the reel hub vibrates during high-speed tape feeding, which also causes noise.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a reel drive device of a tape recorder capable of simplifying the configuration, reducing the number of parts, and automatically mounting on a chassis. There is.

(Means for Solving the Problems) In order to achieve the above object, a reel drive device of a tape recorder according to the present invention has a cylindrical reel receiver integrally formed at the center of the upper surface of a reel base that is driven to rotate by a motor.
A plurality of guide grooves that are long in the axial direction are provided at equal intervals in the circumferential direction on the peripheral wall of the reel receiver, and an annular body is loosely fitted to the outer periphery of the reel base. A plurality of elastic pieces that respectively fit in the guide grooves are integrally formed upward, and the outer surface side of each elastic piece is used as an engaging ridge that engages with an engaging projection of the reel hub. A compression spring is compression-inserted between the annular body and the upper surface of the reel stand, and the tips of the elastic pieces are elastically brought into contact with the upper ends of the guide grooves.

(Function) A compression spring is fitted to the outer circumference of the reel receiver from the upper end side,
Next, when the annular body is pressed and fitted downward from the upper end side on the outer circumference of the reel receiver while compressing the compression spring, the elastic piece integrated with the annular body slides on the outer peripheral surface of the reel receiver. , The elastic piece bends outward. Then, when the upper end of the elastic piece coincides with the upper end of the guide groove of the reel receiver, the elastic piece returns to the center side by the elastic force and fits into the guide groove. Thereafter, when the hand is released from the annular body, the elastic piece is pushed up together with the annular body by the urging force of the spring, the upper end of the elastic piece abuts the upper end of the guide groove, and the annular body is prevented from coming off from the reel receiver. The whole assembly is completed.

In this way, the reel drive unit pre-assembled can be mounted on the chassis simply by rotatably fitting the inner hole of the reel receiver to the shaft erected on the upper surface of the chassis. Can respond well to.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. First
1 is a plan view of a reel driving device of a tape recorder according to the present invention, FIG. 2 is a bottom view of the device, and FIG. 3 is III- of FIG.
A sectional view taken along line III and FIG. 4 are exploded perspective views of the same apparatus. In FIG. 1 and FIG. 3, reference numeral 1 denotes a chassis, on the upper surface of which a shaft 2 is erected, and the reel driving device 3 of the present invention is rotatably mounted on the chassis 1 via the shaft 2. The reel driving device 3 has a disk-shaped reel stand 4, and an annular gear 5 projecting downward at the outer peripheral edge of the reel stand 4.
Are integrally formed.

An annular reinforcing rib 6 is formed on the upper surface of the reel base 4, and a plurality of protrusions 7 for detecting the rotation state of the reel base 4 are integrally formed on the lower surface. A cylindrical reel receiver 8 is integrally formed at the center of the upper surface of the reel stand 4. This reel receiver 8
The peripheral wall on the upper end side is a tapered surface 9 whose diameter gradually decreases toward the upper end side. On the peripheral wall of the reel receiver 8, a plurality of (three in this embodiment) guide grooves long in the axial direction thereof are provided.
Ten are provided. Each guide groove 10 has a length extending from the lower end of the reel receiver 8 to a portion located slightly below the lower end of the tapered surface 10. On the inner side of the upper end surface of the reel receiver 8, a bearing cylinder 11 is integrally provided so as to be spaced apart from the peripheral wall thereof. The lower end of the bearing cylinder 11 is at substantially the same level as the lower end of the protrusion 7 on the lower surface of the reel stand 4.
Further, between the outer peripheral surface of the bearing cylinder 11 and the inner peripheral surface of the reel receiver 8, a plurality (three in this embodiment) of reinforcing ribs 20 are integrally formed at equal intervals in the circumferential direction. ing. The bearing cylinder 11 is rotatably fitted to a shaft 2 provided upright on the upper surface of the chassis 1. In this fitted state, the annular projection 12 on the inner peripheral surface on the upper end side of the bearing cylinder 11 is elastically fitted into the annular groove 13 on the outer peripheral surface on the upper end side of the shaft 2, so that the bearing cylindrical body 11 is rotated.
It is difficult to slip out of the room. An elastic piece 14 is fitted in each guide groove 10 of the reel receiver 8 so as to be movable along the axial direction. These elastic pieces 14 are annular bodies 15
Is integrally projecting upward and at equal intervals in the circumferential direction. The annular body 15 is fitted on the outer periphery of the reel receiver 8 so as to be movable along the axial direction thereof. When each elastic piece 14 is fitted into each guide groove 10, the outer surface of the elastic piece 14 projects outwardly from the outer peripheral surface of the reel receiver 8. This allows each elastic piece 14 to move inside the reel hub (not shown). The engaging projections are formed so as to engage with the engaging projections radially provided on the circumferential surface. The elastic piece 14 together with the annular body 15 is biased upward by the compression spring 16, and the upper ends of the elastic pieces 14 are in contact with the upper ends of the guide grooves 10. The compression spring 16 is composed of a coil spring, is fitted on the outer periphery of the reel receiver 8 so as to be movable in the axial direction thereof, and is interposed between the collar 17 of the annular body 15 and the upper surface of the reel stand 4 by compression. A gear 18 of the reel base 4 is meshed with a gear 18 rotatably supported on the upper surface of the chassis 1, and is rotationally driven by a motor (not shown). The inner surface on the upper end side of each elastic piece 14 is a tapered surface 19 that gradually extends toward the center side from the lower end side toward the upper end side.

Then, in the disassembled state shown in FIG. 4, first, the compression spring 16 is fitted to the outer periphery of the reel receiver 8 from the upper end side thereof. Next, on the outer circumference of the reel receiver 8,
The compression spring (16) is compressed while the compression spring (16) is pushed downward and fitted. Then, the taper surface 19 on the upper end side inner surface of each elastic piece 14 is brought into sliding contact with the taper surface 9 on the upper end side of the reel receiver 8, whereby each elastic piece 14 bends outward. After that, by further moving the annular body 15 downward, integrally with this,
Each elastic piece 14 moves while slidingly contacting the outer peripheral surface of the reel receiver 8. Then, when the upper ends of the elastic pieces 14 correspond to the upper ends of the guide grooves 10 of the reel receiver 8, the elastic pieces 14 return to the center side by their elastic force and fit into the respective guide grooves 10. After doing this, when the hand is released from the annular body 15, the elastic pieces 14 are pushed upward together with the annular body 15 by the urging force of the compression spring 16, and the upper end thereof abuts the upper end of the guide groove 10. . As a result, the annular body 15 is prevented from coming out upward, and the assembly of the reel drive device 3 is completed. In the reel drive device 3 preassembled in this way, the annular projection 12 of the bearing cylinder 11 is fitted to the shaft 2 by fitting the bearing cylinder 11 of the reel receiver 8 onto the shaft 2 on the chassis 1 from above. It is elastically fitted in the annular groove 13, and the gear 5 of the reel stand 4 meshes with the gear 18 on the chassis 1 so that it can be mounted on the chassis 1 as shown in FIG.

(Effect of the Invention) In the reel driving device of the present invention, the assembly of the reel driving device can be completed by a simple operation of inserting the annular body after inserting the compression spring on the outer periphery of the reel receiver. Since the reel driving device thus preassembled can be mounted on the chassis by simply fitting it to the reel shaft as it is, the automatic mounting on the chassis can be favorably supported.

Further, by integrally molding the cylindrical reel receiver coaxially with the reel stand, it is possible to prevent noise from being generated from the reel driving device even if the reel hub vibrates during high-speed tape feeding.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a plan view of a reel driving device according to the present invention, FIG. 2 is a bottom view of the same, and FIG. 3 is a line III-III of FIG. A sectional view and FIG. 4 are exploded perspective views of the apparatus. 3 ... Reel drive device, 4 ... Reel stand, 8 ... Reel holder, 10 ... Guide groove, 14 ... Elastic piece (engaging ridge), 15
…… Annular body, 16 …… Compression spring.

Claims (1)

[Scope of utility model registration request] 1. A cylindrical reel receiver (8) integrally coaxially formed in the center of the upper surface of a reel stand (4) driven to rotate by a motor, and a circumferential wall of the reel receiver at equal intervals in the circumferential direction. And a plurality of guide grooves (10) formed of long holes provided along the axial direction thereof, an annular body (15) loosely fitted to the outer periphery of the reel receiver, and integrally formed on the upper surface of the annular body. A plurality of elastic pieces (14) whose distal ends are movably fitted in the respective guide grooves, and whose outer surface side protruding from the peripheral wall of the reel receiver is an engaging projection with a reel hub; A reel drive of a tape recorder, comprising: a compression spring (16) interposed between the body and the upper surface of the reel stand, the compression spring (16) contacting the tip of each elastic piece with the upper end of the guide groove. apparatus.