JPH0145057B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding belt for a copying machine and a manufacturing method thereof.

The paper feeding belt used in copying machines, called a platen belt, generally needs to maintain a constant coefficient of friction on its surface in order to feed the paper.
For this reason, a rough surface finish with some degree of unevenness was performed. In other words, countless scratch-like grooves are formed on the belt surface. For example, when copying a document written in pencil, graphite or other dust gets into the grooves and scratches the surface of the platen belt. The dirt on the belt surface has an adverse effect on later copies, such as staining the original to be copied later, and the dirt on the belt surface is almost impossible to remove even by cleaning. For this reason, in frequently used copying machines, it is not uncommon for the belt to have a lifespan of about one month. In addition, the belt surface needs to have a certain roughness in order to perform its paper feeding function, but if the unevenness is too large, it will damage the document, whereas if the unevenness is small, the coefficient of friction will be small and the paper feeding function will be reduced. Control of the belt surface finish was also accompanied by technical complexity.

In order to solve the above-mentioned problems, the present invention provides a paper feeding belt in which the surface of the belt is finished to a smooth mirror surface and continuously formed with fine irregularities capable of maintaining a constant frictional force, and a method for manufacturing the same. This will be described in detail below with reference to the illustrated embodiments.

FIG. 1 is a perspective view showing an ordinary platen belt, and the belt 1 is endless and cylindrical and made of rubber. FIG. 2 is an explanatory front view showing an example of the conventional manufacturing method of the belt 1, in which a cylindrical belt material 1' is closely wrapped around a mold 2 made of a cylindrical iron core, etc. is driven to rotate around its axis. On the other hand, the circumferential surface of the grindstone 3, which is pivotally supported in the rotational direction, is pressed against the circumferential surface of the belt material 1' and is driven to rotate while moving left and right, so that the belt material 1' has a predetermined thickness and a predetermined rough surface. is polished until it forms.

FIG. 3 is an explanatory partial cross-sectional front view showing the belt manufacturing method of the present invention. In the manufacturing method of the present invention, first, a certain fine irregularity is continuously formed on the circumferential surface of an abrasive mold. The point has one characteristic. That is, the polishing mold 4 has a peripheral surface knurling,
A surface having a certain fine unevenness 6 is continuously formed by grain treatment, shotplast, or adhesion of glass particles, and the belt material 5' is tightly attached to the circumferential surface of the mold 4 with a certain tension. It is to be exteriorized. As a result, the peripheral surface of the belt material 5' having a uniform thickness exhibits certain fine irregularities corresponding to the fine irregularities 6 on the peripheral surface of the mold 4.

In the embodiment of the present invention, the belt material 5' is made of vulcanized rubber, and the cylindrical belt material 5' made of the vulcanized rubber may be extruded into a tube shape using a commonly used extruder. Molding may be carried out by known means, such as wrapping unvulcanized rubber prepared in a sheet shape around a drum-shaped mold and vulcanizing it.

After the belt material 5' prepared in this manner is placed in a polishing mold, the circumferential surface of the belt material 5' is polished to a certain thickness with a grindstone 8 in the manner described in FIG. The polished surface is finished so as to form a smooth, dense surface that is a so-called mirror surface. Such a mirror surface can be formed arbitrarily by using a grindstone surface made of dense particles or by changing the rotational speed, left-right movement speed, etc.

The belt is completed by completing the above-mentioned polishing, but when it is removed from the mold 4, due to the minute irregularities 6 on the peripheral surface of the mold and the elasticity of the belt material 5', the density inside the cross section during packaging is increased. The circumferential surface of the belt 5, which has been polished into a perfect circumferential surface in a state of uneven density, is polished as shown in FIG. The inner circumferential surface returns to its original cylindrical surface, and conversely, the outer circumferential surface forms continuous fine irregularities 7 according to the degree of density. As a result, the circumferential surface of the completed belt 5 will exhibit a certain uneven shape while remaining a mirror-like smooth surface.

Although the paper feeding belt was explained in the above embodiment, the manufacturing method of the present invention is not limited to rubber belts for paper feeding. Not only can it be applied to parts formed with irregularities, but it can also be applied to the manufacture of plates of rubber, plastic, etc., rings, etc., with regular or amorphous patterns formed on their surfaces.

As a result of the present invention being constructed as described above, the surface of the finished belt retains sufficient frictional force to hold and feed the paper due to its fine irregularities, and the surface of the irregularities itself is smooth and dense. Because it is a flat surface, it is almost impossible for graphite from pencils or dust to accumulate on the belt surface, which is the case with conventional belts, and even if it does adhere, it can be easily removed by washing, so the life of the belt is reduced. It is significantly longer than before. Moreover, the method of the present invention makes it possible for the first time to produce a belt with such performance, and also eliminates the difficulty of embedding the belt in order to maintain the roughness and density of the circumferential surface of the belt at a constant level.

[Brief explanation of drawings]

Figure 1 is a perspective view of a conventional platen belt, Figure 2 is a perspective view of a conventional platen belt.
The figure is an explanatory front view showing an example of the manufacturing method, FIG. 3 is an explanatory partially sectional front view showing the belt manufacturing method of the present invention, and FIG. 4 is an enlarged sectional view of the completed belt. . 1... Belt, 1'... Belt material, 2, 4... Mold,
3... Grindstone, 5... Belt, 5'... Belt material, 6,
7...Unevenness, 8...Whetstone.

Claims (1)

[Scope of Claims] 1. A paper feeding belt for a copying machine, in which constant fine irregularities capable of maintaining a frictional force are continuously formed on the entire circumferential surface, and the surface of the fine irregularities forms a smooth mirror surface. 2. A belt material made of an endless cylindrical rubber-like elastic body is fitted with a certain tension into a cylindrical mold that has a constant fine irregularity formed continuously on its circumferential surface, and A method for manufacturing a paper feeding belt for a copying machine, which comprises rotating a mold together with a belt material, and polishing the circumferential surface of the belt material using a grindstone to form a smooth mirror surface.