JPH09156790A - Paper feeding and carrying roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep a stable frictional coefficient with being hardly influenced by paper powder, and keep stable paper feeding and carrying characteristic by regulating the surface potential of a paper feeding and carrying roll in paper passing within a prescribed range. SOLUTION: In this paper feeding and carrying roll used for feeding or carrying of paper sheets, the surface potential in paper passing is regulated to 0kV∼-20kV. The regulation of the surface potential is performed by properly selecting the roll material, the kind of a filler, and the surface treatment of the roll. When this paper feeding and carrying roll is used, the paper surface is positively charged, the roll surface is negatively charged, and the surface potential of the roll surface becomes 0kV∼-20kV. On the contrary, when a general rubber roller is used, the surface potential is about -50kV∼-70kV. Since paper powder is charged with positive charge, on the other hand, the paper powder is extremely hardly adhered to this paper feeding and carrying roll, compared with a conventional roll. Thus, the reduction in frictional coefficient by adhesion of paper powder can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding / conveying roll used for various sheet feeding / conveying rolls of various office automation equipment such as copying machines, facsimiles, various printers and the like.

[0002]

2. Description of the Related Art Conventionally, it has been possible to maintain a high friction coefficient in rolls for feeding / conveying various OA equipments, particularly in various feed rolls such as pickups, feeds and reverses in the feeding device of various OA equipments. Desired. These paper feed / conveyance rolls are generally made of a material such as EPDM (ethylene / propylene / diene rubber) or polynorbornene, silicone rubber, urethane rubber, etc. In order to prevent a decrease in the friction coefficient due to the influence of paper dust, etc., After being formed into a tubular shape, the surface of which is subjected to quadrilateral polishing or the surface of which is provided with irregularities is used.

[0003]

However, the conventional paper feeding / conveying roll is not one in which the adhesion property of paper dust or the like on the roll itself is adjusted, but paper dust is less likely to be accumulated on the roll surface. It's not a fundamental solution.

In addition, in order to polish the surface of the surface or to manufacture the surface-roughened roll, it is necessary to use a special molding die or post-treatment after molding, which causes a problem that the manufacturing process becomes complicated. Further, in the case of a polishing roll, there is also a problem that due to the influence of polishing powder, a white spot phenomenon in which toner or ink does not remain on the printed surface of the fed or conveyed paper and the photosensitive drum is contaminated. Further, since the polished product is more easily worn than the non-polished product, the lower the hardness of the roll material is, the more problematic the durability is.

In view of the above circumstances, the present invention provides a stable friction coefficient that is not easily affected by paper powder without adding a special manufacturing process as in the past by making it difficult for paper powder and the like to adhere. An object of the present invention is to provide a sheet feeding / conveying roll that can maintain and maintain stable sheet feeding / conveying characteristics.

[0006]

SUMMARY OF THE INVENTION The present invention for solving the above-mentioned problems is a paper feed / conveyance roll used for feeding or conveying paper sheets, and has a surface potential of 0 kV to -20 k during paper passage.
A sheet feeding / conveying roll characterized by being adjusted to V.

Here, the adjustment of the surface potential is performed by, for example,
This is performed by selecting the material of the roll.

The surface potential is adjusted by, for example, a filler compounded in the roll.

Further, the adjustment of the surface potential is performed by, for example,
The surface treatment of the roll is performed.

As described above, the present invention does not exist in the prior art in which a paper feeding / conveying roll with which paper dust is hard to adhere is realized by adjusting the surface potential of the paper feeding / conveying roll so as to fall within a predetermined range. It was made based on a new idea. Then, specifically, the surface potential is adjusted by appropriately selecting the roll material, the type of the filler, the roll surface treatment, and the like. The surface potential when some members are rubbed together can be sufficiently predicted by those skilled in the art to be able to adjust the material by changing the material thereof. It can be performed appropriately. Further, the specific adjustment itself needs to be performed by measuring the surface potential in the paper passing state according to the actual use situation.

When the paper feeding / conveying roll of the present invention is used, the paper surface is positively charged and the roll surface is negatively charged, and the surface potential of the roll surface becomes 0 kV to -20 kV. On the other hand, when a general rubber roller is used, its surface potential is -50 kV-
It becomes about -70 kV. On the other hand, since the paper dust is positively charged, the paper feed / conveyance roll of the present invention is much less likely to have the paper dust attached, as compared with the conventional roll. Therefore, the paper feeding / conveying roll of the present invention can prevent the reduction of the friction coefficient due to the adhesion of paper powder or the like, and can maintain the high friction coefficient for a long period of time.

Since the paper feeding / conveying roll of the present invention can prevent the reduction of the friction coefficient due to the adhesion of the paper powder in this way,
It is not necessary to polish the surface as in the past, and can be used as normal polishing, or if it is a material with good dimensional stability, use molded products such as injection molding, press molding, extrusion molding as it is. You can The paper feed / conveyance roll of the present invention may be one that has been subjected to quadrilateral polishing, and it is possible to obtain the synergistic effect that paper dust is unlikely to adhere and is unlikely to deposit on the surface.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the following examples, which do not limit the scope of the present invention in any way.

100 parts by weight of phenyl group-containing organopolysiloxane raw rubber, 45 parts by weight of silica surface-treated with a silane coupling agent and silicone oil, a dispersant, a curing agent, and a non-acyl organic peroxide 2
By mixing parts by weight, primary vulcanization at 170 ° C. for 14 minutes and secondary vulcanization at 200 ° C. for 4 hours under the molding conditions, as a feed / conveyance roll, a feed roll and a reverse roll (hardness: JISA scale) 35 °) was manufactured.

Feed roll: outer diameter 24 mm x inner diameter 16 mm x length 2
3.5mm reverse roll: outer diameter 27mm x inner diameter 17mm x length 2
3.5 mm For comparison, a similar paper feeding and conveying roll was manufactured in the same manner except that the filler was changed to silica which was not surface-treated (Comparative Example 1).

For each roll, the surface potential at the time of paper passing, the initial coefficient of friction, the coefficient of friction after passing 100,000 sheets, and the change in outer diameter after passing 100,000 sheets were measured, and the results are shown in Table 1. It was A conventional EPDM paper feed roll (hardness: JI
The same test was conducted for SA scale of 40 ° (Comparative Example 2). The results are also shown in Table 1.

From the results shown in Table 1, the paper feeding and conveying roll according to the present invention has a surface potential of -12.5 kV, which is close to zero, and therefore the friction coefficient is reduced and the outer diameter is reduced after 100,000 sheets have been passed. The change was remarkably small.

[0018]

[Table 1]

[0019]

As described above, since the paper feed roll of the present invention does not easily adhere to paper powder during paper passing, the friction coefficient is unlikely to decrease due to the adherence of paper powder, etc. It is possible to maintain stable paper feed and transport characteristics.

Claims (4)

[Claims] 1. A paper feed / conveyance roll used for feeding or conveying paper sheets, wherein the surface potential during paper passage is from 0 kV to
A roll for feeding and feeding a paper, characterized in that the roll is adjusted to −20 kV. 2. The paper feed / conveyance roll according to claim 1, wherein the surface potential is adjusted by selecting a material of the roll. 3. The paper feed / conveyance roll according to claim 1, wherein the surface potential is adjusted by a filler mixed in the roll. 4. The paper feeding / conveying roll according to claim 1, wherein the surface potential is adjusted by surface treatment of the roll.