JPH1059578A - Rubber roller for conveyance and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the adhesion of paper powder and dust securely while maintaining friction coefficinet and resistance against wear of rubber and remove static electricity charged on equipment to be mounted simply and securely. SOLUTION: In a rubber roller for conveyance 1 which is provided with a rubber roller member 2 which conveys a sheetlike object to be conveyed, recessed and projection parts 2b, 2c for increasing friction coefficient are provided on an outer peripheral face of the roller member 2, a mold releasing layer having the sliding property is formed at least on an inner face of the recessed part 2b, and a protruding end part of the projection part 2c which comes into contact with the sheetlike object to be conveyed S is exposed from the mold releasing layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer rubber roller for transferring a sheet-like conveyed object such as paper or film, and a method for manufacturing the same.

[0002]

2. Description of the Related Art A rubber roller for conveying a sheet-like conveyed material such as a paper feeding / discharging roller used for a copying machine, a printer, a facsimile and the like and an industrial roller for conveying paper, film, etc. has conventionally been provided with an outer peripheral surface. In this case, small projections are provided in a coarse shape, or a plurality of grooves are provided on the outer peripheral surface of the roller member.

On the other hand, when a device to which the transfer rubber roller is attached is a copying machine or the like, a plurality of sheet-like transfer materials (paper) laminated by the charged static electricity adhere to the device and are simultaneously transferred. For this reason, static electricity countermeasures are taken by forming the transfer rubber roller of conductive rubber and attaching a static elimination brush to the device. The brush also plays a role of scraping off and removing paper dust and dust adhering to the outer peripheral surface of the transfer rubber roller.

[0004]

However, in the transfer rubber roller having an uneven surface on the outer peripheral surface of the roller member, the projection end of the protrusion of the roller member which comes into contact with the sheet-like conveyed material has paper dust or dust. Is difficult to adhere, but easily adheres in the recess. The paper dust and dust adhering in the concave portion accumulate in the concave portion, and when the accumulation progresses to some extent, the dust gradually falls between the sheet-like conveyed material and the roller member to cause a slip (slip phenomenon). There is.

On the other hand, as a countermeasure against static electricity of the equipment to be mounted, when the transfer rubber roller is formed of conductive rubber and a brush for removing static electricity is attached, a certain amount of static electricity can be grounded to eliminate static electricity. There is a problem that there is variation in the static elimination action. further,
The transfer rubber roller must be formed of a special conductive rubber, and the device has a problem that the number of parts such as brushes increases and the cost increases.

Accordingly, the present invention is to prevent the adhesion of paper dust and dust while maintaining the friction coefficient and abrasion resistance of rubber, and to easily and surely eliminate static electricity charged on equipment to be mounted. It is an issue.

[0007]

In order to solve the above-mentioned problems, a transfer rubber roller according to the present invention is a transfer rubber roller provided with a rubber roller member for transferring a sheet-like conveyed material. A concave / convex portion for increasing the coefficient of friction is provided, and at least an inner surface of the concave portion is formed with a slippery release layer, and the protruding end of the convex portion that comes into contact with the sheet-like conveyed product is released from the mold. It is configured to be exposed from the layer. The rubber forming the roller member includes natural rubber (NR), synthetic natural rubber (IR), styrene-butadiene rubber (SBR), and butadiene rubber (B
R), diene-based vulcanized rubber such as nitrile rubber (NBR) and ethylene propylene rubber (EPDM).

It is preferable that the release layer is formed of a fluorine coating material. Examples of the fluorine coating material include fluorine resins such as PTFE and FEP.

A sleeve made of a conductive material is attached to the center of the roller member, while a conductive material is mixed with the fluorine coating material, and the fluorine coating material containing the conductive material is coated from the inner surface of the concave portion of the roller member to the sleeve. Preferably, the release layer is formed. Examples of the conductive material include carbon and molybdenum.

Alternatively, it is preferable that the release layer is formed by synthesizing the rubber surface with a surface treatment liquid. The surface treatment liquid is composed of a mixed liquid of ethyl acetate and a chlorine compound, and reduces the friction coefficient of the rubber surface and reduces the adhesiveness by utilizing a double bond and a chemical reaction of the rubber.

According to the present invention, as a method of manufacturing the transfer rubber roller, the transfer rubber roller includes a roller member made of rubber and a sleeve for attaching to a drive shaft, and transfers the sheet-like conveyed article by rotation of the drive shaft. Forming a concave-convex portion on the outer peripheral surface of the roller member to increase the coefficient of friction, and then forming a slippery release layer on the outer peripheral surface including at least the concave-convex portion of the roller member. The projecting end of the projecting portion of the roller member that comes into contact with the sheet-like conveyed material is polished so that the projecting end of the projecting portion is exposed from the release layer.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. The transfer rubber roller 1 of the present invention is shown in FIG.
As shown in (A), (B) and (C), a roller member 2 made of NBR and a sleeve 3 made of a conductive material are provided, and the surface of the roller member 2 and the sleeve 3 has a slippery release. The layer 4 is provided.

The roller member 2 has a substantially cylindrical shape having a through hole 2a at the center, and a plurality of axially extending grooves are formed on an outer peripheral surface of the roller member 2 which comes into contact with a sheet-like conveyed material, thereby increasing the friction coefficient. Recesses 2b and projections 2c are formed. Although the concave and convex portions 2b and 2c are formed by V-shaped grooves, the shape of the grooves may be any of a square groove, a trapezoidal groove, a saw blade groove, a semicircular groove, and a circular groove. In the drawing, the extending direction is also a horizontal groove extending in the axial direction, but may be any of a vertical groove, a helical groove, a worm groove, a diamond cut groove, a thread cut groove, and the like. Further, instead of the groove, a small protrusion may be provided on the outer peripheral surface of the roller member 2 in a coarse shape to form an uneven portion.

The sleeve 3 has a substantially cylindrical shape having a mounting hole 3a at the center, and a mounting portion 3b having a screw hole 3c protrudes from one end surface thereof.

The release layer 4 is formed by coating a fluorine coating material made of tetrafluoroethylene resin (PTFE) containing carbon as a conductive material, and is formed from the inner surface of the concave portion 2 b of the roller member 2. Only the protruding end of the protrusion 2 c of the roller member 2 is provided on the outer surface of the sleeve 3 and is exposed from the release layer 4.

When manufacturing the transfer rubber roller 1 having the above-described configuration, first, the sleeve 3 is set in a cavity of a mold (not shown), and then rubber is poured into the cavity to form the irregularities on the outer peripheral surface. The roller member 2 is formed with the parts 2b and 2c provided. After the core is set in the mold and the roller member 2 is formed into a cylindrical shape, the sleeve 3 may be attached to the central through hole 2a.

Next, the uneven portion 2 on the outer periphery of the roller member 2
10 from the outer peripheral surface including b and 2c to the sleeve 3.
A release layer 4 is formed by applying a fluorine coating material containing a conductive material to a thickness of about 20 μm. Thereafter, the protruding end of the protrusion 2c of the roller member 2 is polished to remove only the release layer 4 on the protrusion 2c, and the protruding end of the protrusion 2c made of a rubber material is removed from the release layer 4. Expose.

When the transfer rubber roller 1 having the above construction is used as a paper feeding / discharging roller of a copying machine, for example, as shown in FIG. After the 3a is positioned and inserted, the screw 6 is screwed into the screw hole 3d at a required mounting position, thereby fixing the transfer rubber roller 1 to the drive shaft 5.

When the transfer rubber roller 1 is mounted, the protruding end of the projection 2c of the roller member 2 exposed from the release layer 4 of the roller member 2 comes into contact with the sheet S, ie, the paper. Therefore, the feeding and discharging operation of the sheet-like conveyed material S can be reliably performed without lowering the rubber characteristics and the friction coefficient of the roller member 2. On the other hand, the paper dust of the sheet-like conveyed material S enters the concave portion 2b of the roller member 2 as in the related art, but since the release layer 4 having slipperiness is formed in the concave portion 2b, The paper powder hardly adheres to the inside of the recess 2b, and even if it adheres, the paper dust easily peels off from the inside of the recess 2b due to the wind pressure due to the rotation of the roller member 2 and the like. Do not invade. As a result, the characteristics and the friction coefficient of the rubber constituting the roller member 2 can be maintained.

The static electricity charged in the copying machine is reliably grounded from the release layer 4 through the sleeve 3 and the drive shaft 5 by the conductive material mixed with the fluorine coating material forming the release layer 4. To remove electricity. Also,
The static electricity charged on the sheet-like conveyed material S stacked in the copying machine can also be grounded because the release layer 4 also comes into contact with the sheet-like conveyed material S by pressing the roller member 2 against the sheet-like conveyed material S.

When it is not necessary to take a countermeasure against static electricity on the transfer rubber roller 1, it is not necessary to mix a conductive material with the fluorine coating material, and the side surface of the roller member 2 including the sleeve 3 is not required. It is not necessary to apply a fluorine coating material, and the release layer 4 may be provided only in the recess 2b. Similarly, when it is not necessary to take a countermeasure against static electricity, instead of the fluorine coating material, the roller member 2 is coated with a rubber surface treatment solution composed of a mixed solution of ethyl acetate and a chlorine compound, and the rubber is subjected to double bonding. The rubber layer may be subjected to an additional synthesis reaction by utilizing a chemical reaction with the release layer 4 to have a slippery property and a small tackiness. According to this surface treatment liquid, the bloom phenomenon can be prevented and a glossy surface can be obtained.

The method for forming the release layer 4 is not limited to coating, but the roller member 2 is immersed in a chemical bath containing a molten fluorine coating material or a surface treatment liquid.
It may be formed by a so-called dipping method. further,
The concavo-convex portions 2b and 2c formed on the roller member 2 may be formed by first forming the roller member 2 into a column shape and then polishing the outer peripheral surface thereof.

[0023]

As is apparent from the above description, in the rubber transfer roller of the present invention, since a slippery release layer is provided on the inner surface of the concave portion of the roller member, paper dust, dust and the like are provided in the concave portion. The paper dust and dust are hardly adhered to even if they enter, and even if they adhere, they can be easily removed by rotation of a drive shaft or the like, and the accumulation in the concave portion can be reliably prevented. Therefore, the rubber property and the friction coefficient of the protruding end of the convex portion of the roller member exposed from the release layer can be maintained, and the sheet-like conveyed material can be surely conveyed without causing a slip (slip phenomenon). be able to. Further, since the release layer comes into contact with the sheet-like conveyed object by pressing the roller member against the sheet-like conveyed object, the abrasion resistance can be improved.

Further, a sleeve for attaching to the drive shaft is formed of a conductive material, a conductive material is blended with the fluorine coating material forming the release layer, and the fluorine coating material containing the conductive material is coated on the sleeve. When the release layer is formed in this manner, static electricity charged to the device to which the rubber transfer roller is attached can be reliably grounded without variation, and can be removed. Furthermore, the static electricity charged on the sheet-like conveyed material stacked in the apparatus can be grounded at the same time because the release layer comes into contact with the sheet-like conveyed material by pressing the roller member.

Further, in the method of manufacturing the transfer rubber roller, the method includes forming an uneven portion on the outer peripheral surface of the roller member, and then forming a slippery release layer on the outer peripheral surface including the uneven portion of the roller member. Since the protruding end surface of the protruding portion of the roller member is polished to expose the protruding end portion of the protruding portion, the transfer rubber roller having the above configuration can be manufactured simply and reliably.

[Brief description of the drawings]

1A and 1B show a transfer rubber roller of the present invention, wherein FIG. 1A is a side view, FIG. 1B is a cross-sectional view taken along line II of FIG. 1A, and FIG. 1C is an enlarged cross-sectional view of a main part of FIG. .

FIG. 2 is a cross-sectional view showing a state in which the transfer rubber roller of FIG. 1 is used as a roller for feeding and discharging paper.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Conveying rubber roller, 2 ... Roller member, 2b ... Recess,
2c: convex portion, 3: sleeve, 4: release layer, 5: drive shaft,
S: sheet-like conveyed material.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display B29K 27:12

Claims (5)

[Claims] 1. A conveying rubber roller provided with a rubber roller member for conveying a sheet-like conveyed object, wherein an outer peripheral surface of the roller member is provided with an uneven portion for increasing a coefficient of friction, and at least an inner surface of the concave portion is provided. A rubber roller for conveyance, wherein a release layer having a slippery property is formed, and a protruding end of a convex portion which comes into contact with the sheet-like conveyed material is exposed from the release layer. 2. The transfer rubber roller according to claim 1, wherein the release layer is formed of a fluorine coating material. 3. A sleeve made of a conductive material is attached to the center of the roller member, while a conductive material is blended with the fluorine coating material, and the fluorine coating material containing the conductive material is coated from the inner surface of the concave portion of the roller member to the sleeve. 3. The method according to claim 2, wherein the release layer is formed.
The transfer rubber roller according to 1. 4. The transfer rubber roller according to claim 1, wherein the release layer is formed by synthesizing a rubber surface with a surface treatment liquid. 5. A method for manufacturing a transfer rubber roller comprising a rubber roller member and a sleeve for attaching to a drive shaft, the transfer rubber roller transferring a sheet-like conveyed material by rotation of the drive shaft, wherein the outer peripheral surface of the roller member is provided. An uneven portion for increasing the coefficient of friction is formed on the outer peripheral surface including at least the uneven portion of the roller member. A method of manufacturing a rubber roller for conveyance, characterized in that the protruding end of the convex portion is polished to expose the protruding end of the convex portion from a release layer.