JP2727042B2 - Copier paper feed belt - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feed belt for a copying machine used in an automatic document feeder of a copying machine.

[0002]

2. Description of the Related Art FIG. 1 shows a copying machine capable of automatically copying a plurality of originals continuously. That is, in the copying machine 1, a plurality of originals 3 are placed on an original placing table 2 disposed at the upper end of one side of the main body in a stacked state with the front surfaces thereof facing down. When the table cover 4 is rotated about an end edge as shown by the arrow A in the drawing to fall on the platen glass 5 and then operated by pressing a switch (not shown), The provided paper feed belt 6 (endless elastic belt) made of white rubber travels in the direction of arrow B, and the document 3 placed on the document table 2 is moved.
Each time a copy is completed, the original is conveyed one by one from the upper side onto the original platen glass 5. In this case, in response to the copy, the copy paper 8 or 10 stored in the copy paper cassette 7 or 11 is conveyed into the copy machine 1 and
The characters and patterns on the surface of the original 3 are transferred and sent to the copy tray 9. As shown in FIG. 2, the paper feed belt 6 of the copying machine 1 travels by rotating two drive rollers 12 to convey the document 3. The paper feed belt 6 requires a frictional force to convey the document 3, and requires a document separation property for discharging the document 3. As a material for forming the paper feed belt 6, conventionally, a terpolymer of ethylene-propylene-diene rubber (hereinafter abbreviated as “EPDM”) and epichlorohydrin-ethylene oxide-allyl glycidyl ether (hereinafter “ECO”) has been used. ) Is used as the main component.

[0003]

However, the paper feed belt 6 formed using the above rubber composition as a forming material has the following problems. If the dirt transferred from the original to the belt surface, for example, dirt such as pencil powder, is wiped off with a cleaning solvent, the belt itself will stretch,
There is a problem that the belt slips at the time of driving and the paper feeding property is reduced. Further, the belt is usually formed by a molding die. However, since Cl is contained in the ECO, if a large amount of this is used, the die will be corroded. Therefore, the amount of ECO must be reduced to a small amount.
As a result, there is a problem that the electrical resistance is increased, the original paper is charged and attracted to the belt, and the removability of the original is deteriorated.

The present invention has been made in view of such circumstances, and has as its object to provide a paper feed belt for a copying machine having a small electric resistance value and excellent paper feedability.

[0005]

The paper feed belt of a copying machine according to the present invention is made of ethylene-propylene rubber (hereinafter referred to as "EP").
M ") and EPDM and acrylonitrile-butadiene rubber (hereinafter abbreviated as" NBR ") as a main component. It has a configuration of being formed.

[0006]

In other words, the present inventors have conducted a series of studies to obtain a paper feed belt excellent in paper feedability without increasing the electric resistance value. In the course of the research, first, at least one of EPM and EPDM, which are said to have poor compatibility, was used as the paper feed belt forming material, instead of the conventionally used rubber composition containing EPDM and ECO as main components. Using. Then, the research was repeated mainly on a rubber composition containing at least one of the above-mentioned EPM and EPDM and NBR as main components. As a result, it has been found that when sulfur vulcanization is performed using this rubber composition, the solvent resistance for washing is improved, and furthermore, the corrosion of the molding die does not occur. But,
It was found that the sulfur vulcanizing agent was vulcanized with NBR, not sufficiently vulcanized with EPDM, and the rubber component was not uniformly vulcanized. And as a result of further research,
If vulcanization molding is performed by peroxide vulcanization (peroxide vulcanization) instead of the sulfur vulcanization described above, the rubber component is uniformly vulcanized, and EPDM of EPDM is considered in consideration of prevention of mold corrosion caused by conventional ECO. The present inventors have found that there is no increase in electric resistance value caused by a high blending amount, and that elongation due to wiping of a solvent for washing is suppressed.

Next, the present invention will be described in detail.

The paper feed belt of the copying machine of the present invention
It is produced by forming a rubber composition mainly containing at least one of M and EPDM and NBR into a desired belt shape by peroxide vulcanization.

The EPM and EPDM are not particularly limited, and conventionally known ones are used.

The NBR is not particularly limited, and a conventionally known one is used.

At least one of the above-mentioned EPM and EPDM (X) and NBR (Y) are mixed in a weight ratio of X
It is preferable to set the ratio of / Y = 90/10 to 30/70. That is, when X exceeds 90 (Y is less than 10), the electric resistance is increased, the original paper is charged and attracted to the belt, and a conveyance failure occurs. Conversely, X is less than 30 (Y exceeds 70). This is because, although the electric resistance is small and the transportability is good, the whiteness of the belt itself tends to decrease.

The vulcanizing agents used for the peroxide vulcanization include dicumyl peroxide, 1,3-bis (t-butylperoxyisopropyl) benzene, 1,4-bis (t-butylperoxy) 3,3 And organic peroxides such as 2,5-trimethylcyclohexane, 2,5-dimethyl-2,5-di-t (butylperoxy) hexyne, and n-butyl-4,4-bis (t-butylperoxy) valerate. . The amount of the peroxide vulcanizing agent is EPD.
As for M and NBR, it is preferable to add 0.01 mol of effective active oxygen to 100 parts by weight (hereinafter abbreviated as "part") of the polymer.

[0013] In addition to the above components, other additives such as a filler, a softening agent, a vulcanization accelerating aid, an antioxidant, and a processing aid are appropriately compounded in the rubber composition.

The paper feed belt of the copying machine of the present invention is obtained, for example, as follows. That is, a rubber composition is prepared by mixing and kneading at least one of the above-mentioned EPM and EPDM, NBR, a peroxide vulcanizing agent, and other additives at a predetermined ratio and kneading them. Then, the above rubber composition was filled in a molding die and vulcanized under the vulcanization conditions (165).
(° C. × 30 minutes) to obtain a paper feed belt having a desired shape.

[0015]

As described above, the paper feed belt of the copying machine according to the present invention is formed by peroxide vulcanization of a rubber composition mainly composed of at least one of EPM and EPDM and NBR. It was done. For this reason, the rubber component is uniformly vulcanized, and there is no increase in the electric resistance value caused by a high blending amount of EPDM in consideration of the prevention of mold corrosion caused by the conventional ECO. Is suppressed. Therefore, the use of the copy paper sheet feed belt prevents the charge sheet from being attracted and attracted due to the high electric resistance value and the slip phenomenon at the time of driving due to the belt elongation, thereby realizing good paper feedability.

Next, examples will be described together with comparative examples.

[0017]

Examples 1 to 6 and Comparative Examples 1 to 3 Tables 1 and 2 below
Were mixed and kneaded at the ratios shown in the same table to prepare a rubber composition. Next, the rubber composition is filled in a molding die having a predetermined shape, and the rubber composition is filled therein. The conditions (in the case of sulfur vulcanization: 160 ° C. × 30)
(Peroxide vulcanization: 165 ° C. × 30 minutes) to obtain a paper feed belt for a copying machine.

[0018]

[Table 1]

[0019]

[Table 2]

The rupture strength, rupture elongation and surface electric resistance (23 ° C. × 55% RH) of each of the thus obtained examples and comparative examples were measured. Further, the paper feedability of the above-mentioned examples and comparative examples was evaluated by both the paper-passing property and the solvent resistance according to the following method. The results are shown in Tables 3 to 5 below.

The above breaking strength and breaking elongation are JIS K
6301.

The surface electric resistance value is 23 ° C. × 55% R
Under the condition of H, it was measured according to JIS K 6911.

The paper feedability in the paper feedability was evaluated by the following method. First, a paper feed belt of a copying machine made of the above rubber composition was incorporated into an automatic copying machine, and A4 paper, which is most frequently used for copying, was used for 10,000 copies.
When the failure occurrence rate of less than 0.1% (less than 10 sheets) due to charge adsorption or the like when the sheet is fed is ○, the failure occurrence rate is 0.1
% Or more (10 sheets or more) was evaluated as x. Further, the solvent resistance was evaluated by the following method.
That is, the paper feed belt of a copying machine made of the above rubber composition was incorporated into an automatic copying machine, wiped ten times with a cleaning solvent, and then fed five minutes later. The case where the belt slipped and the paper was not fed was evaluated as x.

[0024]

[Table 3]

[0025]

[Table 4]

[0026]

[Table 5]

From the results in Tables 3 to 5, the product of Comparative Example 2 has a high surface electric resistance, and the product of Comparative Example 3 has a very low strength. Further, the comparative examples were all poor in paper feedability. On the other hand, it can be seen that the example product has high strength, low surface electric resistance, and excellent paper feedability.

[Brief description of the drawings]

FIG. 1 is a perspective view of a copying machine.

FIG. 2 is a front view of a paper feed belt used in the copying machine.

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location G03G 15/00 510 G03G 15/00 510

Claims (1)

(57) [Claims] 1. A rubber composition comprising at least one of ethylene-propylene rubber and ethylene-propylene-diene rubber and acrylonitrile-butadiene rubber as main components, and vulcanized with the above rubber composition to form a belt. A paper feed belt for a copying machine characterized by being formed.