JPH0531699Y2 - - Google Patents

Description

[Detailed explanation of the invention] "Purpose of the invention" (Field of industrial application) The present invention relates to a flywheel structure in a tape recorder, etc., and in particular, it has a simple structure and is easy to manufacture, but it has extremely high accuracy. It concerns a high flywheel structure.

(Prior Art) Conventionally, the wheel body of a flywheel used in a tape recorder or the like has been formed by forging, and the outer peripheral surface of the wheel body has been processed to ensure accuracy. There were also flywheels made by laminating multiple disks punched out of thin iron plates.

(Problems to be solved by the invention) Capstan wheels in tape recorders are generally required to have no eccentricity, constant speed rotation, etc., but the conventional forged flywheel described above is It had the disadvantage of being eccentric due to the presence of so-called "jags" in some parts, and therefore it was necessary to ensure balance by drilling holes on the opposite side of the "jams". Further, even if such processing is performed, sufficient accuracy cannot be ensured, and these processing and processing of the outer peripheral surface, etc., have the disadvantage of increasing costs.

On the other hand, in the case of stacking thin metal discs formed by stamping, not only does the number of assembly steps increase and the cost increases, but also there is a problem with assembly accuracy when assembling each disc, and the stacked wheel body It was not suitable for practical use due to large variations in balance etc.

The purpose of this invention is to eliminate the above-mentioned conventional drawbacks,
It is an object of the present invention to provide a flywheel structure for a tape recorder, etc., which is easy to manufacture, does not require special processing for balance, and can obtain excellent rotational precision.

``Structure of the invention'' (Means for solving the problem) A circular wheel body with a shaft hole in the center is formed by punching out a thick sheet metal using a press, and a wheel body is press-fitted into the shaft hole. In a flywheel equipped with a shaft member such as a capstan shaft,
The shaft hole is formed into a rectangular shape, and the shaft member is press-fitted through a shaft fixing member inserted through the shaft member, and the shaft fixing member has a flange or the like that abuts on the upper surface of the hole body. and a square press-fitted part formed at the bottom of the circular part so as to be press-fitted into the shaft hole, and the rough surface caused by the sheared surface and fractured surface on the outer peripheral surface of the wheel body is prevented from slipping. It is configured so that a belt can be directly hung on the outer circumferential surface.

(Function) It is easy to obtain a wheel body from a thick sheet metal by punching and pressing, and the sheet metal material is uniform in density, and the obtained wheel body has no eccentricity. When a fixing member obtained by insert molding a shaft member such as a capstan shaft in resin is press-fitted into the shaft hole formed at the center of the wheel body and the shaft member is planted, the shaft member is Centering can be set with high precision. A belt is directly applied to the outer circumferential surface of the wheel body, and since the outer circumferential surface is formed into a rough surface with sheared surfaces and fractured surfaces, this provides an optimal slip prevention and ensures accurate drive transmission.

(Embodiment) An embodiment of the flywheel structure in a tape recorder or the like according to the present invention will be explained based on FIGS. 1 to 4. FIG. 2 is a perspective view showing the state in which the shaft member is installed; FIG. 3 is a plan view showing an example in which the shaft member is installed in a capstan wheel of a tape recorder; and FIG. 4 is a part of the same. FIG.

The basic structure of the flywheel structure of the present invention is a one-piece wheel body 2 having a shaft hole 3 in the center by punching out a thick sheet metal A using a press.
A shaft member 4 such as a capstan shaft is installed in the shaft hole 3 via a shaft fixing member 5 made of resin or the like. Since a rough surface 2a is formed on the outer peripheral surface of the wheel body 2 by the sheared surface and the fractured surface, the belt 10 is directly hung on the outer peripheral surface using this rough surface 2a as a slip stopper. The shaft hole 3 is formed in a square shape, and the shaft fixing member 5 has a square press-fitting part 6 that is press-fitted into the shaft hole 3.
A circular part such as a flange 7 that comes into contact with the upper surface of the wheel body 2 is integrally molded to stabilize the shaft member 4. Engineering plastic can be used as the material for the shaft fixing member 5, and the shaft member 4 can be insert molded.

To explain an example in which the above-described configuration is implemented on a capstan wheel in a tape recorder, as shown in FIGS. 3 and 4, the capstan wheels 1 and 11 are arranged at the predetermined positions shown in FIG. 3. However, belt 10 hung on motor M
is hung on the outer circumferential surface of the capstan wheels 1, 11 in a substantially "S" shape, and then returns to the motor M around the outer circumference of the capstan wheel 11. The capstan wheels 1, 11 are constructed as described above, and a capstan shaft 14 is installed as the shaft member 4, and a ball shaft portion 15 is formed at the rear end of the capstan shaft 14. . In the capstan wheel 1, the shaft fixing member 5 is the same as that shown in FIG.
In the capstan wheel 11, the shaft fixing member 5 is a V-pulley 8 instead of the flange 7.
is formed, and a gear 9 is integrally formed on the top thereof. Each capstan shaft 14 of the capstan wheels 1 and 11 has a bearing portion 1 provided on a support plate 12.
3, and the ball shaft portion 15 is supported by a shaft portion 17 disposed on the bottom plate 16.
The V-pulley 8 is connected to another rotating body 18 by a V-belt 19, and the gear 9 meshes with another gear (not shown).

"Effects of the invention" According to the flywheel structure of the tape recorder etc. according to the invention, it is easy to obtain the wheel body from a single thick sheet metal by punching and pressing, and the sheet metal material has a low density. Since the wheel body is uniform, there is no eccentricity, and there is no need for processing for balance adjustment as in the past. A square shaft hole is formed in the center of the wheel body, so when a shaft fixing member made of resin or the like, into which the shaft member is insert-molded, is press-fitted into the shaft hole and the shaft member is planted, the shaft member will be raised. Centering can be set with precision. In addition, the belt is directly hung on the outer circumferential surface of the wheel body, and since the outer circumferential surface is formed into a rough surface with sheared surfaces and fractured surfaces, this serves as an optimal anti-slip surface and ensures accurate drive transmission. be able to.

[Brief explanation of the drawing]

The drawings show an embodiment of the flywheel structure in a tape recorder or the like according to the present invention, and FIG. 1 is a cross-sectional view schematically showing a state in which a wheel body is punched out from a sheet metal by a press, and FIG. 2 is a diagram showing a shaft member. FIG. 3 is a plan view showing an example applied to a capstan wheel of a tape recorder, and FIG. 4 is a partially sectional side view of the same. A... Sheet metal, 1, 11... Capstan wheel, 2... Wheel body, 2a... Rough surface, 3...
Shaft hole, 4... Shaft member, 5... Shaft fixing member, 6...
Press-fitting part, 7...flange, 8...V pulley, 9
...Gear, 10...Belt.

Claims (1)

[Scope of claim for utility model registration] A circular wheel body with a shaft hole in the center formed by punching out a thick sheet metal using a press, and a shaft member such as a capstan shaft press-fitted into the shaft hole. In the flywheel, the shaft hole is formed in a rectangular shape, and the shaft member is press-fitted and fixed via a shaft fixing member inserted through the shaft member, and the shaft fixing member is inserted into the hole body. It consists of a circular part such as a flange that comes into contact with the upper surface, and a square press-fit part formed at the bottom of the circular part so as to be press-fitted into the shaft hole, and has a sheared surface and a fractured surface on the outer peripheral surface of the wheel body. A flywheel structure for a tape recorder or the like, characterized in that a belt is directly hung on the outer circumferential surface by using the rough surface produced by this as a slip stopper.