JPS63270973A - Manufacture of high friction pulley - Google Patents

Abstract

PURPOSE:To have an adjustable frictional degree, a reduced cost and also realize reduction in a weight and a size with regard to the high friction pulley in the caption, by constituting a pulley in such a way that a sintered thin plate formed through a sintering roll after mixing hard dust material in light metal raw material is so curved into the shape of a circular body as to form an outer peripheral wall and resin material is press-fitted therein and processed so as to form a bearing body. CONSTITUTION:A prescribed quantity of hard dust material such as ceramics is mixed in aluminum light metal raw material and then it is formed in a sintered plate 1 in the state of a thin plate through a sintering roll process. After that, it is curved into a circular body as to form an outer peripheral wall and a bearing body 2 is formed to be a pulley by the process that resin material is press-fitted into the circular part to be processed and fixed. Because the sintered plate 1 mixed beforehand with ceramic material as a high frictional material is employed as the outer peripheral surface of the pulley, the friction degree can be adjusted in accordance with the place for using the device. Furthermore, the yield of mass production is enhanced by, to producing the same product at a low cost because the required process is only to form a predetermined shape. And the sintered plate 1 can be thinned, so that the entire weight can be reduced and OA devices of reduced weight and sizes can also be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pulley used as a driving device for a metal belt or paper feed.

[Prior Art] Current small office automation equipment uses small drive devices to suit its shape, and particularly when driving metal belts, drive precision is required, and drives for paper feeding are required. In this case, a surface fit is required to prevent the paper from slipping, and both are important conditions.

In order to satisfy these conditions, the pulley for driving the belt etc. has been required to have a high friction surface and a high wear surface.

For example, in the prior art, it is known to form a thin film of hard metal on the belt driving surface, as disclosed in Japanese Utility Model Publication No. 47-29148, and Japanese Utility Model Publication No. 57-44.
As disclosed in No. 864, the surface of the pulley made of aluminum, which is a light metal, is finished by machining, and then chromium oxide, alumina oxide, tungsten,
It is known that the pulley surface can be processed into a hard, high-friction, high-wear surface by applying an appropriate amount of extremely hard oxide such as tungsten carbide by thermal spraying.

[Problems to be Solved by the Invention] However, in such conventional pulleys, when the former technique is used, when forming a thin film of hard metal on the drive surface of the pulley surface, the pulley itself It is good for soft materials such as rubber belts, but the contact resistance with the pulleys is small due to the mirror surface state of the metal belts. ,
As a result, problems such as slipping and sagging occurred.

In addition, when using the latter technique, the pulley surface is processed by thermal spraying, so the outer diameter of the pulley cannot be accurately processed, and it cannot be used for metal belts or belts with precise dimensions such as paper feed belts. There was a problem.

In addition, in any of the conventional examples, since the entire pulley is made of a metal material, it tends to be heavy, which poses a problem in reducing the weight and size of the device.

[Means for Solving the Problems] Therefore, the present invention was developed to effectively solve the problems of the conventional pulley manufacturing method. A predetermined amount of fine powder is weighed and mixed with an aluminum light metal material, the light metal material is sintered and rolled into a thin plate, and then bent into a circular shape to form a pulley outer peripheral wall, and 111
1. A method of manufacturing a high-friction pulley in which a bearing body is formed by press-fitting and fixing a resin material into the outer circumferential wall of a circular pulley is provided.

[Function] Accordingly, in the present invention, a plate material mixed with a ceramic material serving as a high friction material is manufactured in advance, and the plate material is manufactured into a circular curved body as the outer peripheral surface of the pulley, so that the use of the equipment is simplified. The degree of friction can be adjusted depending on the location.

Moreover, since it is only necessary to process it into a predetermined shape, the degree of mass production is very good and identical products can be provided at low cost.

Furthermore, since the ceramic plate that forms the outer peripheral surface can be made very thin depending on the degree of processing, the overall weight can be reduced, making it possible to reduce the weight and size of OA equipment.

[Example] The present invention will be explained in detail below.

The high-friction pulley according to this embodiment is manufactured by mixing a predetermined amount of hard fine powder with a light metal material, sintering and rolling the light metal material to form a sintered thin plate, and then bending it into a circular shape to form an outer circumferential wall. and a bearing body is formed by press-fitting a resin material into the inside of a sintered plate body of a curved circular body to form a pulley. It is.

That is, a hard material such as ceramic, chromium oxide, tungsten, etc. is first ground into fine powder and a particle of a certain size is selected. The particle size at this time is aimed at approximately 30 to 50 microns, and is mixed into a coarsely ground aluminum material. The mixing ratio is adjusted depending on the material of the belt to be slid, but it is approximately 10 to 30 vo.
Adjustments are made using 1% as a guideline.

Next, the mixture of fine powder and light metal bodies is put into a furnace, melted, and compressed into a homogeneous mixture, which is then heated to high temperature and sintered to form a plate. .

The plate-shaped sintered body 1 is thinned to approximately 0.8 mm by pressurizing the sintered plate 1 as shown in FIG.
This makes it easier to manufacture the outer peripheral wall by machining a circular curved body.

The sintered plate 1 is processed into a long plate having a width required for a pulley, and then cut into predetermined lengths and bent into a circularly curved body.

As mentioned above, the sintered plate 1 becomes a complete circular tube by welding the rounded end portion 1a as shown in Fig. 2, thereby completing the so-called outer circumferential wall of the pulley. be.

A resin material is put into the inner peripheral space of the completed sintered plate outer peripheral wall l, which will become the bearing body 2 as shown in Fig. 3, and of course the bearing body 2 is formed by insert resin molding. It is okay to do so.

A through hole 2a through which a bearing (not shown) passes and is fixed is bored in the center of the bearing body 2, but it goes without saying that the material of the bearing body 2 may be made of light metal itself.

In this way, the thin material of the outer peripheral wall made of the sintered plate 1 and the light material of the bearing body 2 reduce the overall weight, and a pulley with a predetermined frictional resistance is formed, making it more suitable for small OA equipment. This will make an even greater contribution.

Furthermore, even though this pulley is made of a mixture of fine powder, it uses a pressure-molded plate, so the dimensional accuracy of the surface is high and a highly accurate OA device can be obtained.

[Effects of the Invention] As described above, according to the high-friction pulley according to the present invention, by making the outer peripheral surface of the pulley a sintered metal body, a thin-walled pulley can be manufactured, so that the pulley itself as a whole is It is possible to reduce the weight of the

Furthermore, since such pulleys do not require different dimensions to match the diameters of each pulley, mass production is highly effective and cost reductions can be expected. Moreover, it is economical because it is only necessary to adjust the plate-shaped development length of the outer circumferential diameter, and there is no need to manufacture a large number of molds to match the required outer diameter.

Furthermore, although the surface of this pulley is processed to be smooth, it is in a state where it can provide resistance so that the influence of fine powder appears on the surface, so when a belt is used, the belt may slip. There is no such thing.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing the unfolded length of a sintered plate serving as the outer circumferential surface of a pulley according to the present invention, and FIG. 2 is an explanatory diagram of the state in which the sintered plate is bent into a torus. FIG. 3 is a perspective view of the completed high-friction pulley with the bearing body injected. l... Sintered plate body, 2... Bearing body.

Claims (1)

[Claims] A predetermined amount of hard fine powder is mixed with a light metal material, the light metal material is sintered and rolled into a sintered thin plate, and then bent into a circular body to form an outer peripheral wall, and the circular body is A method for manufacturing a high-friction pulley, characterized in that the pulley is formed by forming a bearing body by press-fitting a resin material into the inside of the outer peripheral wall.