JPH06115750A - Paper conveying belt - Google Patents

Abstract

PURPOSE:To prevent a surface from easily staining so as to facilitate also manufacture by obtaining almost uniform friction surface over a conveying belt total area, increasing a coefficient of friction of a conveying belt surface against paper, and on the other hand decreasing a coefficient of friction against paper conveying surface. CONSTITUTION:An endlessly woven cloth is used as a belt core material, and its obverse and reverse are coated with a rubber material, to form a rubber belt 10. A heating unit 20 having a pressing surface 21 satin finished in a mesh state is pressed to only a coating layer in a surface side of this rubber belt 10, to form many mesh-shaped irregularities 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper conveying belt made of an endless rubber belt, and more particularly, it is arranged on a paper conveying surface made of glass or the like so as to slide on the conveying surface, and the conveying surface and the belt. The present invention relates to a paper conveyance belt that holds a paper inserted therebetween by a frictional force and conveys the paper.

[0002]

2. Description of the Related Art Generally, in many copying machines such as an electrophotographic copying machine, an original is placed on a platen glass, the original surface is illuminated through the platen glass, and the original is reflected by an exposure optical system. An image is formed on the photoconductor and exposed. And recently, an endless rubber belt that moves along the platen glass surface is provided,
There is also provided a copying machine in which a document inserted between the belt and the platen glass is automatically sent to the exposure position by the belt and automatically discharged after the exposure.

[0003]

The above-described document conveying belt is constituted by an endless belt in which a rubber material is formed into an annular shape during the molding process, or both ends are joined together into an annular shape after molding. Is required to have a large coefficient of friction on the surface of the original and a small coefficient of friction on the platen glass.

That is, it is necessary to give a sufficient conveying force to the original to overcome the friction with the platen and to convey the original, and to the platen glass, static electricity is generated at the parts contacting each other and the original is sent. The smaller the friction coefficient is, the better so that the conveyance of the incoming document is not disturbed and the belt surface is not damaged.

The coefficient of surface friction of the conveyor belt is determined by the material and the surface rough and dense shape, but practically, improvement of the surface rough and dense shape is required. This is because such a conveyor belt is required to be white and very anti-friction, and usable materials are limited. In addition, if the belt surface is mirror-finished, a so-called knocking phenomenon occurs in which the belt comes into close contact with the glass surface and repeats unstable rotation, and smooth conveyance cannot be obtained.

Therefore, conventionally, the surface of the belt is molded and then polished to roughen the surface. However, in order to form a uniform surface over the entire length of the endless belt, precise work is required, and There are drawbacks such that dust adheres to the surface and causes pollution, and dust is generated during the use. Particularly, formation of a uniform rough surface by polishing requires extremely difficult work because the belt is distorted in a wavy shape during molding.

Therefore, the present inventor first intervenes a cloth between the die for press vulcanization and the belt based on the knowledge that mesh-shaped irregularities are formed on the surface of the belt in the process of press vulcanization during belt molding. Then, an attempt was made to form a rough surface, but it was difficult to adopt due to the following drawbacks.

Since a belt made of a rubber material is heated at the time of vulcanization, when a cloth having a fine mesh is used, the belt and the rubber cannot be integrated and cannot be peeled off. It has been found.

Next, a cloth with a coarse mesh was used, but the unevenness of the belt surface inevitably became rough and slipped on the original to cause a conveyance error. A defect that a speckled pattern appears was found. In addition, the manufacturing process is also complicated, and it has been found that defects are continuously produced because special care is required in the process of peeling the cloth from a particularly soft belt.

The present invention has been made in view of the above circumstances, and a substantially uniform friction surface is obtained over the entire area of the conveyor belt, and the coefficient of friction of the surface of the conveyor belt with respect to paper is large, while the friction with respect to the paper conveyor surface is obtained. An object of the present invention is to provide a paper conveyance belt having a small coefficient, a surface which is hard to be soiled, and which can be easily manufactured.

[0011]

A paper carrying belt according to the present invention comprises an endless rubber belt arranged so as to slide on a paper carrying surface, and is inserted between the paper carrying surface and the belt. In a paper carrying belt for moving paper on a paper carrying surface, the rubber belt is made of endlessly woven cloth as a belt core material, and its front surface and back surface are coated with a rubber material. It is characterized in that a large number of mesh-shaped irregularities are formed on the surface by being pressed by a heating body having a pressing surface that is satin-finished in a mesh shape.

[0012]

[Effects and Effects of the Invention] By using a heating body having a mesh-shaped satin-finished pressing surface, the belt surface can be used against paper and paper conveying surface (platen glass in the case of the above). The most preferable unevenness can be formed uniformly and easily.

Further, since the paper conveying belt of the present invention uses the endlessly woven fabric as the belt core material, there is no joint in the belt core material, so that there is no variation in hardness which is likely to occur at the joint portion. While the hardness is kept uniform over the entire core material, a large number of mesh-shaped irregularities are formed on the surface by being pressed by a heating body having a pressing surface that is satin-finished in a mesh shape. The coefficient of friction is almost uniform, so even if the part of the belt to be conveyed is different, a substantially uniform conveying force is applied to the paper to eliminate uneven conveyance,
The paper can be conveyed stably.

Further, in the paper conveying belt of the present invention, since the above-mentioned mesh-shaped irregularities are formed only on the coating layer on the front surface side, friction between the driving means such as rollers for transmitting the driving force to the belt and the back surface of the belt. The coefficient is kept high, and therefore slippage of both of them is unlikely to occur, and from this point as well, the paper can be stably conveyed.

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows a manufacturing process of a document conveying belt according to an embodiment of the present invention. First, a raw yarn such as a synthetic fiber prepared in step 1 (indicated as S1 in the drawing; the same applies hereinafter) is endless (cylindrical) in S2.
Weaving on the fabric. As an example, the document conveying belt of the present embodiment is formed to have an inner peripheral length L = 1074.5 mm and a width W = 308 mm (see FIG. 3) and is used for conveying a document of a copying machine. The length is set in the range of 1075 to 1078 mm, and the width is cut to 415 mm in S3.

Separately from the above cloth, a solvent is added to the belt rubber material such as urethane prepared in S4 to dissolve it,
White titanium powder, an ultraviolet absorber and an antistatic agent are added to this solution and stirred to prepare a coating solution having a viscosity of 6000 to 8000 cps (S6). As the above-mentioned ultraviolet absorber, salicylic acid derivatives, benzophenones, benzotriazoles, nickel chain products, etc., and as antistatic agents, long-chain aliphatic amines and amides, phosphoric acid esters, polyethylene glycol, etc. are known. Things can be used.

In step S7, a solvent is further added to the coating liquid to prepare a zipping liquid having a viscosity of 10 to 20 cps. The cloth is dipped (zipping) in this zipping solution in S8, and then dried in S9. The dried fabric is set in a vulcanizer (S10), for example, 13
It is heated under the condition of 0 ° C. × 10 minutes. Next, the surface of the cloth is coated with the coating liquid (S11),
Dry under conditions of 30 to 35 ° C. for about 30 minutes (S1
2). The same coating and drying as described above are further repeated twice and a total of three times, and then the same coating and drying are performed twice on the back surface of the fabric (S13, S14). In the conventional document conveying belt of this type, the rubber material is generally coated on the back surface only once. However, in this way, the rubber material is coated as many times as the front surface. Thus, the warp of the belt can be prevented. If it is necessary to prevent the warp of the belt irrespective of the economical efficiency, the back surface of the belt may be coated three times like the front surface. This is because the uniform surface finish cannot be obtained if the warp of the belt is large when the "texturing" process described below is applied. The times were normal.

The endless belt having the rubber material coated on the front and back surfaces of the fabric as described above is then press-vulcanized in step S15. As an example, the vulcanization temperature is set to 90 ° C., the pressure is set to 2.0 kg / cm ² , and the vulcanization time is set to about 4 minutes. As shown in FIG. 2, the heating body 20 used in this press vulcanization is one in which the pressing surface 21 on the surface thereof is processed to have a satin finish. Therefore, during press vulcanization, the belt rubber 2 on the surface of the belt 10 is At the same time, it undergoes so-called "texturing" processing. Therefore, belt 10 after press vulcanization
Innumerable textures 4 (fine irregularities) are formed on the surface (see FIG. 3). The texture 4 is formed on the pressing surface 21 of the heating body 20.
By appropriately selecting the matte finish, it is possible to make the shape most suitable for paper transportation, and it is possible to form extremely fine irregularities on the belt surface in a uniform shape.

The endless belt after press vulcanization is allowed to stand for 5 hours to 1 week in S16. By leaving it for such a long period of time, the internal strains in the circumferential direction and the width direction generated during the press vulcanization are removed.
Then, this endless belt is slit in S17 to a predetermined width to obtain an endless original conveying belt 10 in which belt rubbers 2 and 3 are carried on the front surface and the back surface of the cloth 1 as shown in FIG. As mentioned above, the belt rubber 2 on the front surface is formed with innumerable embosses 4.

The results of the test of the properties of the original conveying belt 10 obtained as described above (by the Chemicals Inspection Society of Japan test) are shown below. In addition, the test results of the paper transport belts prepared for comparison are added in <<. The paper transport belt of this comparative example was obtained by coating the same belt base fabric as in this example with a coating liquid having a viscosity of 6000 to 8000 cps obtained by adding titanium white powder to a solution of urethane rubber, three times on the front surface and once on the back surface. And, it was formed without performing the above-mentioned embossing. 1) Brightness (according to JIS Z8721);
9.7 << 9.0 >> 2) Half reduction (according to JIS L1094; applied voltage 10000 V); 0.8 seconds << --- >> 3) Weather resistance (using sunshine weather meter,
According to JIS A1415.

Black panel temperature 63 ± 3 ° C. Rain cycle 18 minutes / 120 minutes Test time 100 hours Average discharge voltage 50V Average discharge current 60A Judgment according to JIS L0804) Discoloration and discoloration; 3-4 grade << 1-2 grade >> State: None <None> 4) Dynamic friction coefficient (ASTM D1894-C test speed 200mm) Copy paper: 0.45 << 0.40 >> Glass: 0.34 << 0.73 >> As above Since the original conveying belt 10 of the present embodiment is subjected to the embossing processing as described above, the coefficient of dynamic friction with the glass is 0.34, which enables smooth movement on the platen glass and reduces the load on the belt drive mechanism. It has been reduced. On the other hand, the coefficient of dynamic friction with the copy paper is as large as 0.45, and the copy paper can be reliably held and accurately conveyed.

Further, the document conveying belt of this embodiment has an extremely high lightness of 9.7, whereas the conventional document conveying belt of this type has a lightness of about 9.0. Further, it is shown that discoloration and fading of grades 3 to 4 are extremely difficult to discolor. The half-life when applying 10000 V is 0.8 seconds, and it is very difficult to be charged, and the document is not electrically attracted to the belt and is not separated when the document is discharged.

FIG. 4 shows a manufacturing process of a document conveying belt according to another embodiment of the present invention. The document conveying belt according to the present embodiment has the above-described press vulcanization (S15) and left (S15).
16) is different from the document conveying belt of the above-described embodiment in that it is formed by performing open drying (S18), fan cooling (S19), and rapid cooling (S20).

The above-mentioned open drying is performed by using the belt 10 as an example.
The belt surface on which the embossing 4 is formed is rotated by rotating the belt on the rotating roller to prevent width shrinkage and curl.
It is dried at 0 ° C. for about 20 minutes. In addition, fan cooling is done to stabilize the circumference of the belt 10 and prevent width shrinkage.
Do about 5 minutes. The rapid cooling is to rapidly cool the belt at a low temperature of about 5 ° C. in order to prevent the belt 10 from contracting in width. In the embodiment described above, the belt 10 is formed by embossing.
Left for up to 1 week (S1
6) was required, and it was still difficult to completely remove the internal strain. However, the above open drying (S1
8) By performing fan cooling (S19) and rapid cooling (S20), the internal strain can be almost completely removed if the belt after the rapid cooling is left for at least 4 days. It was

[Brief description of drawings]

FIG. 1 is a flow chart showing a manufacturing process of a paper conveyance belt according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a part of a manufacturing process of the paper carrying belt of the above embodiment.

FIG. 3 is a perspective view showing a paper transport belt of the above embodiment.

FIG. 4 is a flowchart showing a manufacturing process of a paper conveyance belt according to another embodiment of the present invention.

[Explanation of symbols]

 1 Fabric 2, 3 Belt rubber 4 Texture 10 Original transport belt 20 Heating element 21 Pressing surface of heating element

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location G03B 27/62 8106-2K G03G 15/00 107 8530-2H 108 7369-2H B29K 21:00 B29L 29 : 00 4F

Claims (1)

[Claims] 1. A paper comprising an endless rubber belt arranged so as to slide on the paper carrying surface, and a paper inserted between the paper carrying surface and the belt is moved on the paper carrying surface. In the conveyor belt, the rubber belt is made of an endless woven fabric as a belt core material, and the front and back surfaces thereof are coated with a rubber material. Only the coating layer on the front surface side is mesh-finished and pressed. A paper transport belt, wherein a large number of mesh-shaped irregularities are formed on the surface by being pressed by a heating body having a surface.