JPS593392Y2 - Tape recorder reel hub shaft - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a reel hub shaft of a tape recorder.

Conventionally, a reel hub shaft that rotationally drives a tape reel has a rotating cylindrical body 3 having a flange portion 3a at the lower end rotatably fitted around the outer periphery of a support shaft 2 erected on a recorder board 1, as shown in FIG. A friction transmitting member 4 having a large friction coefficient such as felt, a rotation transmitting pulley 5, a compression coil spring 6, and a reel rotor 7 are fitted in order from above on the outer periphery of this rotating cylindrical body 3. It had been.

The reel rotor 7 is inserted into a tape reel and rotates the reel, and cannot rotate with respect to the rotating cylindrical body 3.

Further, the rotation transmission pulley 5 has a rubber ring 8 fitted on its outer periphery, and a drive pulley (not shown) is brought into pressure contact with the outer periphery of the rubber ring 8 to be rotationally driven.

Therefore, since the friction transmission member 4 is in pressure contact with the flange 3a and the rotation transmission pulley 5 by the spring 6,
When the pulley 5 rotates, the rotating cylindrical body 3 and the reel rotor 7 also rotate together with the pulley 5, thereby rotationally driving the tape reel.

Further, when an excessive load is applied to the reel rotor 7, the rotor 7 and the rotating cylindrical body 3 stop, and only the pulley 5 continues to rotate while slipping between it and the friction transmission member 4.

However, in the above configuration, since the compression coil spring 6 is interposed between the reel rotor 7 and the rotation transmission pulley 5, the axial length of the reel rotor 7 is limited. When driven to rotate, the tape reel tends to swing, which causes uneven running of the tape, resulting in wow, flutter, and the like.

Further, since the rotation transmission pulley 5 is movable in the axial direction, the pressing force of the pulley 5 against the friction transmission member 4 changes depending on the direction in which the driving force is applied to the pulley 5.
Another drawback was that the running state of the tape became unstable.

Furthermore, a special mechanism is required to adjust the strength of the spring 6, resulting in a complicated structure and the troublesome adjustment work required.

This invention was made in view of the above circumstances, and aims to be able to stably rotate the tape reel, prevent uneven running of the tape, and prevent wow and flutter caused by uneven running of the tape. The object of the present invention is to provide a tape recorder adhesive hub shaft with a simple configuration that allows for easy installation.

An embodiment of this invention will be described above with reference to the drawings.

In the figure, reference numerals 11 and 12 indicate a reel rotor and a rotation transmission pulley, each made of synthetic resin.

The reel rotor 11 has three rotors arranged at equal intervals in the circumferential direction on its outer periphery.
It has two reel drive claws 13, 13.13, a small-diameter cylindrical portion 14 extending downward, and is rotatably supported on a support shaft 16 erected on a recorder board 15.

The upper end of the support shaft 16 is connected to the support shaft 16 of the reel rotor 11.
A set screw 17 is screwed together to prevent removal from the housing.

The boss portion 18 of the rotation transmission pinion 12 and the knoll rotor 1
A friction transmitting body 19 formed in a cylindrical shape and made of an elastic material such as rubber or soft synthetic resin is inserted between the first cylindrical portion 14 and the first cylindrical portion 14 .

The friction transmitting body f9 is elastically pressed against the inner circumferential surface of the boss portion 18 and the outer circumferential surface of the circumferential portion 14 in a state where its wall thickness is compressed, thereby causing the rotation transmitting pulley 12 and the reel rotor 1
1 and rotate together.

Further, a rubber ring 20 is fitted to the outer periphery of the pulley 12.

A drive pulley (not shown) is in pressure contact with the outer periphery of the rubber ring 20 of the rotation transmission pulley 12, and the rotation transmission pulley 12 is rotationally driven by a motor (not shown) via the drive pulley.

With the above configuration, when the rotation transmission pulley 12 is rotationally driven by the motor, the rotation is caused by the friction transmission body 19.
is transmitted to the reel rotor 11 via the reel rotor 1.
The tape reel into which 1 is inserted can be driven to rotate.

In addition, in a reel-to-reel tape recorder, when the tape is completely wound onto one reel,
The reel rotor 11 is forcibly stopped by the tension of the tape. On the other hand, only the rotation transmission pulley 12 continues to rotate while slipping.

According to this embodiment, the boss portion 18 of the rotation transmission pulley 12
A friction transmitting body 19 is inserted between the inner circumferential surface and the outer circumferential surface of the cylindrical portion 14 of the reel rotor 11, and the friction transmitting body 19 is elastically pressed against both surfaces to connect the rotation transmitting pulley 12 and the reel rotor 11. Since it is configured so that the and rotates as one,
Compared to the conventional type shown in FIG. 1, the number of parts is smaller, the structure is simpler, and processing and assembly are easier.

In addition, since a spring that compresses in the axial direction is not interposed between the reel rotor 11 and the rotation transmission pulley 12, the length of the reel rotor 11 in the axial direction is increased accordingly, and the tape reel can be stably loaded. This makes it possible to eliminate wow and flutter caused by the swinging of the tape reel.

Furthermore, since the rotation transmission pulley 12 does not move in the axial direction, the driving force always acts on the pulley 12 in a fixed direction, making it possible to rotate the pulley 12 stably, which in turn allows the tape to run stably. This also makes it possible to prevent wow and flutter from occurring.

In addition, there is no need for the troublesome work of adjusting the elastic force of the spring to adjust the rotation transmission force between the rotation transmission pulley and the reel rotor, which is required in conventional models, making it suitable for mass production and reducing costs. be able to.

This invention is not limited to the above-mentioned embodiment, and the friction transmitting body inserted between the inner circumferential surface of the rotation transmission pulley 12 and the outer circumferential surface of the reel rotor 11 is shown in FIG. A coil spring 21 as shown may be used, or a two-triangular cylinder body 22 made of synthetic resin as shown in FIG. 6 may be used.

That is, the coil spring 21 shown in FIG. 5 is wound around the outer periphery of the cylindrical portion 14 of the reel rotor 11 in a state in which it is almost in contact with the outer periphery of the cylindrical portion 14, and one end of the coil spring 21 is fixed to the rotation transmission pulley 12. 12 rotates, one end of the spring 21 rotates in a direction to reduce the coil diameter and comes into elastic pressure contact with the outer peripheral surface of the cylindrical portion 14, and the pressure force causes the rotation of the rotation transmission pulley 12 to be transferred to the nord rotor. 11.

Further, the triangular cylinder 22 shown in FIG. The rotational force of the rotation transmission pulley 12 is transmitted to the reel rotor 11 by being brought into pressure contact with each other.

In each of the embodiments shown in FIGS. 5 and 6, the same effects as in the embodiments shown in FIGS. 2 to 4 can be obtained.

As detailed above, according to this invention, a friction transmission is inserted between the inner peripheral surface of the rotation transmission pulley and the outer peripheral surface of the reel rotor, and the friction transmission body is elastically pressed against both surfaces. By doing so, a tape recorder with a simple configuration can drive the tape reel to rotate stably, prevent uneven running of the tape, and prevent burr and flutter caused by uneven running of the tape. A reel hub shaft can be provided.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing a conventional example, Fig. 2 is a longitudinal sectional view showing an embodiment of this invention, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Fig. 4 is a longitudinal sectional view showing an embodiment of the invention. FIG. 5 is a partially cutaway front view showing another embodiment of this invention, and FIG. 6 is a cross-sectional view showing still another embodiment of this invention. 11...Reel rotor, 12...Rotation transmission pulley, 19...Friction transmission body, 21...
...Coil spring (friction transmitter), 22...
...Triangular cylinder (friction transmitter).

Claims (1)

[Claims for Utility Model Registration] A support shaft installed upright on the recorder board, a support shaft inserted over almost the entire length of the support shaft and rotatably supported around the support shaft, and a support shaft inserted into the tape reel at the top. a reel rotor having a reel drive claw for rotating the tape reel and having a cylindrical lower part with a small diameter; A tape recorder board comprising: a rotation transmission pulley having a hollow portion; and a coil spring that is wound around almost the entire length of the cylindrical portion in the hollow portion and connected to the rotation transmission pulley at an end. Luhub axis.