JPH026288Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention consists of a first rotating body made of synthetic resin, into which a capstan shaft is press-fitted and fixed, and a second rotating body made of metal that increases inertia. It concerns the flywheel of a tape recorder.

(B) Prior Art In general, a die-cast cut flywheel is used as the flywheel of a tape recorder, and a flat belt is generally used to transmit power to the flywheel. However, with such a structure, if shock or vibration is applied from the outside, the belt may shift vertically from the flat outer circumferential surface of the flywheel, adversely affecting the rotation of the flywheel, or in extreme cases, the belt may shift upward or downward from the flat outer circumferential surface of the flywheel. There was a fear that it might come off. Therefore, in the past, a belt regulating member was separately arranged near the flywheel to regulate the vertical position of the belt, or flanges were integrally formed at the upper and lower ends of the flywheel outer circumferential surface. However, in the former case, the number of parts increases,
In the latter case, the flywheel is made of die-cast material, making it difficult to cut it.

In addition, recently, in order to reduce the cost of flywheels, flywheels are constructed by press-fitting (or gluing) a metal ring from above to a synthetic resin pulley into which a capstan shaft is press-fitted. Although it is being used in flywheels, the prevention of the belt from coming off is done by integrally forming flanges on the top and bottom ends of the outer circumferential surface of the pulley, which makes the mold very complicated. Ta.

(c) Purpose of the invention The present invention was developed with this in mind, and is constructed by combining a first rotating body made of synthetic resin and a second rotating body made of metal for inertia. This makes it extremely easy to take measures to prevent the flywheel belt from coming off.

(d) Structure of the invention In order to achieve the above object, the present invention provides a flywheel for a tape recorder, which consists of a first rotating body made of synthetic resin, into which a capstan shaft is press-fitted and fixed, and a second rotating body made of metal. and the first
A rib is formed on the flat surface of the rotating body, and a flange is formed by resin molding on one end edge of the outer circumferential surface as a belt hanging part, and the second rotating body is formed of a flat metal ring body, and the second rotating body is formed of a flat metal ring body. The second rotating body is formed to have a larger diameter than the first rotating body, and when the second rotating body is press-fitted and fixed to the rib of the first rotating body, the flange of the first rotating body and the edge of the second rotating body This prevents the belt from coming off the outer peripheral surface of the first rotating body.

(E) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

That is, 1 in the figure is a cylindrical bearing part 1 into which a capstan shaft (not shown) is press-fitted and fixed.
A synthetic resin pulley is formed as a first rotating body, and a knurl is formed on the outer circumferential surface 1b of the first rotating body 1, which serves as a belt hanging part, to prevent the belt from slipping. A flange portion 1c is formed at one end edge. 2 is a pulley 1 in order to increase the inertia of the pulley 1.
The outer diameter of the ring body 2 is larger than the outer circumferential surface of the pulley 1.

Therefore, when the ring body 2 is combined with the pulley 1 from above and press-fitted into the rib 1d of the pulley 1, the flange 1 of the pulley 1 is fixed as shown in FIG.
c and the edge of the ring body 2, the outer peripheral surface 1 of the pulley 1
The belt 3 from the motor hung on the pulley 1 can be held in between, and the so-called inconvenience that occurs when the belt 3 hung on the outer circumferential surface shifts vertically and comes off the outer circumferential surface 1b of the pulley 1 does not occur.

(f) Effects of the invention As described above, according to the invention, the second rotating body is combined with the first rotating body made of synthetic resin into which the capstan shaft is press-fitted, and increases the inertial energy of the first rotating body. Since the rotating body is used to prevent the belt from coming off, which is attached to the outer circumferential surface of the first rotating body, it requires less molding than the conventional method in which flanges are integrally formed on the upper and lower outer circumferential surfaces of the first rotating body. becomes easier.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, with Fig. 1 being a partial side sectional view showing the state before the pulley and ring body are combined, and Fig. 2 showing the state in which the pulley and ring body are combined. FIG. 1...pulley, 1c... collar, 2... ring body.

Claims (1)

[Scope of utility model registration request] A tape recorder flywheel comprising a first rotary body made of synthetic resin and a second rotary body made of metal, to which a capstan shaft is press-fitted and fixed, and a rib is formed on the plane of the first rotary body. At the same time, a flange portion is formed by resin molding on one end edge of the outer circumferential surface serving as a belt hanging portion, and the second rotating body is formed of a flat metal ring body and is formed to have a larger diameter than the first rotating body. Then, the second rotating body is
When the belt is press-fitted into the rib of the rotating body, the belt is connected to the first rotating body by the flange of the first rotating body and the edge of the second rotating body.
A tape recorder flywheel is characterized by a tape recorder flywheel that prevents it from coming off the outer peripheral surface of a rotating body.