JPH1157569A - Coating device for coating material on roller surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the generation of coating ununiformity of a coating material by allowing a roller to be treated to contact with a coating material in a storage tank step by step from one end part side and releasing the contact with the coating material step by step from one end part side. SOLUTION: The surface of each rubber roller is coated with the coating material by transporting the rubber roller while rotating on a coating tank 4 as the storage tank storing the coating material in over-flow state. At this time, the coating tank 4 is formed into a parallelogram shape in a planar view by tilting the center line at a fixed angle to the transporting direction of the rubber roller and the problems such as foam involving at the time of charging the coating material, the generation of the mark of liquid breaking are avoided by spirally coating the surface of the rubber roller step by step from one end part to other end part with the coating material in the coating tank 4 and finally breaking the liquid step by step at other end part side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for applying a coating material to a roller surface.

[0002]

2. Description of the Related Art Conventionally, a developing roller used in so-called OA equipment such as an electrophotographic apparatus and an electrophotographic apparatus,
Rubber rollers such as a charging roller, a transfer roller, and a cleaning roller are known.

[0003] In such a rubber roller, a paint is applied to the surface of the roller. Conventionally, as shown in FIG.
A dip method is adopted in which the coating is performed by dipping the coating tank 02 in the paint storage tank 103 where it is stored and then pulling it up.

However, in the case of such a dip method, a dripping 102a is likely to occur in the length direction (see FIG. 10B). Therefore, it is necessary to invert the rubber roller and immerse it again in the paint storage tank 103 (see FIG. 10C), and the application operation is troublesome. In addition, the processing time of one rubber roller requires a long time of 40 s to 60 s, so that the coating efficiency is low. In particular, when the paint contains a high boiling point solvent, the tendency was remarkable.

Therefore, the applicant has developed an apparatus for applying the paint on the roller surface by passing the roller sideways while rotating and transporting the paint while passing it over a coating tank for storing the paint. I have.

[0006]

However, in the case of applying the paint to the surface of the roller by passing over the coating tank for storing the paint while transporting the roller while rotating the roller sideways as described above, If the coating tank is rectangular, the roller contacts the paint in a straight line and separates from the paint in a straight line, so that foaming occurs at the time of charging and bubbles adhere to the roller surface, and traces of liquid when leaving the roller There is a problem that unevenness of coating occurs such as conspicuousness.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an apparatus for applying a coating material to a roller surface, which can prevent uneven application of the coating material.

[0008]

According to a first aspect of the present invention, there is provided a roller for applying a coating material to a roller surface by rotating and transporting a roller to be processed over a storage tank in which a liquid coating material is stored. An apparatus for applying a coating material to a surface, wherein the storage tank gradually comes into contact with the coating material from one end side of the processing target roller, and the contact with the coating material is gradually released from the one end side. Shape.

According to the first aspect of the present invention, by gradually contacting the coating material from one end of the roller to be processed,
The coating material is spirally applied to the surface of the roller, and the contact with the coating material is gradually released from the one end side, and finally the other end is drained.

According to a second aspect of the present invention, in the apparatus for applying a coating material to the roller surface according to the first aspect, the storage tank has a parallel center line inclined at a predetermined angle with respect to the roller transport direction in plan view. It is formed in a quadrilateral shape.

According to the second aspect of the present invention, since the storage tank is formed in a parallelogram shape whose center line is inclined at a fixed angle with respect to the roller transport direction in plan view, the spiral surface is formed on the roller surface. The coating material is applied in a shape and finally drains off at an end different from the end where the application starts.

According to a third aspect of the present invention, in the apparatus for applying a coating material to the roller surface according to the first or second aspect, the storage tank has a receiving tank for receiving the coating material overflowed around.

According to the third aspect of the present invention, the overflowing coating material is received by the receiving tank, and there is no risk of soiling the surroundings, and the received coating material is reused by collection.

According to a fourth aspect of the present invention, in the apparatus for applying a coating material to the roller surface according to any one of the first to third aspects, the roller to be processed is transported by roller transporting means having a pair of left and right chain belts. The roller conveying means includes left and right roller receiving members attached to a chain link of a chain belt, and a connecting plate for connecting the left and right roller receiving members.

According to the fourth aspect of the invention, the left and right roller receivers supporting the roller to be processed are connected by the connecting plate, the interval between the left and right roller receivers is maintained, and the support of the roller to be processed is stabilized. You.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic configuration of an apparatus according to the present invention.
In FIG. 3, reference numeral 1 denotes an apparatus for applying a paint to the roller surface, and a state in which a rubber roller 3 (a roller to be processed) is laid down by a roller conveying means 2 (that is, a state in which the axis is horizontal).
The coating (liquid coating material) is applied by passing through a coating tank 4 (reservoir) in which the paint (liquid coating material) is always stored in an overflow state, while continuously rotating while being supported. After passing through the drying furnace 5, 3
Hot air drying is performed in an atmosphere of 80 to 120 ° C. by the two heater devices 6.

In the coating tank 4, the paint is circulated and the paint is always stored in an overflow state, so that a constant liquid level is maintained. An exhaust fan device 7 is provided.

The rubber roller 3 is, as shown in FIG.
A cylindrical rubber member 3b is attached to and integrated with the outer peripheral surface of the cored bar 3a, and is a roller after vulcanization is completed.

The rubber member 3b includes natural rubber, chloroprene rubber, styrene / butadiene rubber, ethylene / propylene rubber, butyl rubber, acryl / nitrile / butadiene rubber, silicon rubber, urethane rubber,
Crosslinked rubbers such as fluoro rubber, halogenated butyl rubber, chlorosulfonated polyethylene rubber, hydrogenated nitrile rubber, epichlorohydrin rubber, and copolymers using these monomers, blends thereof, and polyolefins And thermoplastic elastomers such as polyester, polyether, polyamide and polyurethane.

The rubber member 3b contains a foaming agent. As the foaming agent, azodicarbonamide, azobisisobutyronitrile, diazoaminobenzene, dinitrosopentamethylenetetramine, p-toluenesulfonylhydrazide, p, p'-oxybis (benzenesulfonylhydrazide) and the like are preferably used. . This foaming agent is used for the rubber roller 3 obtained by foam molding.
It is desirable to set the compounding amount so that 5 to 50% by volume becomes bubbles. That is, if the content is less than 0.5% by volume, the initial effect cannot be obtained.
Is exceeded, the elastic modulus of the rubber roller 3 becomes too low.

The rubber member 3b contains an electric resistance adjusting agent. As the electric resistance adjusting agent, carbon black is suitable, and in addition, graphite, conductive metal particles, or various surfactants can also be used. In addition, the rubber material may contain various softeners for the purpose of adjusting the hardness of the rubber roller 3 (reducing the hardness). As the softener, mineral oils such as aromatic, naphthenic and paraffinic oils, DOP, DOA,
Plasticizers such as DOS and vegetable oils such as rapeseed oil and coconut oil can also be used.

Further, a rubber chemical and a rubber additive can be added to the rubber member 3b as required. Examples of rubber chemicals and rubber additives include vulcanizing agents such as sulfur and peroxide, vulcanization accelerators such as zinc white and stearic acid, and vulcanizing agents such as sulfenamides, thiurams, thiazoles, and guanidines. Sulfuric accelerators, ultraviolet absorbers, ozone deterioration inhibitors, tackifiers, etc. can be used, and various reinforcing agents, friction coefficient modifiers, and inorganic fillers such as silica, talc, and clay can also be selected arbitrarily. I can do it.

The roller transport means 2 includes a drive motor 11
A pair of left and right driving sprockets 12 rotationally driven by
12 and air cylinder 13 drive sprocket 1
A pair of left and right driven sprockets 14, 14, the distance between the shafts of which can be adjusted, and a pair of left and right chain belts 15, 15 wound between them; 2A, a lower linear transport portion 2B, and curved transport portions 2C and 2D connecting them.

Then, a roller carry-in section for carrying the rubber roller 3 to which the paint is applied into one curved carrying portion 2C is provided.
Roller unloading sections for unloading the rubber roller 3 on which the paint has been applied and dried are provided on the other curved transport portion 2D.

The rubber roller 3 conveyed by the roller conveying means 2 is used for applying and drying the paint on the roller surface in the upper linear conveying portion 2A, and for cooling after drying in the lower linear conveying portion 2B. Is performed. Therefore, coating is performed a plurality of times to form a thick film.
In the case of the so-called multi-coating, the cycle of application / drying / cooling is repeated as many times as necessary. However, in the case of performing only one coating, the roller removing device 16 immediately passes through the upper linear transport portion 2A. Roller receiving section 16a
Is removed and transported.

As shown in detail in FIG. 5, the rubber roller 3 is rotatably supported at both ends of a metal core 3a thereof via a magnet 21 and a roller receiving member 22 via a bearing member 23. It is connected to one end of a shaft member 24 (roller support member). A rail member 26 having a sheet-like magnet 25 (rubber magnetic sheet) at an upper portion thereof is provided via a support bracket 27 along the upper linear transfer portion 2 </ b> A in the transfer path of the rubber roller 3.
The magnet 25 is a rail member 26 in this example.
Although the rubber magnetic sheet above is used, the rail member 26 itself may be replaced by a plate made entirely of magnets.

A cylindrical rotating member 28 provided at the other end of the shaft member 24 moves on the magnet 25 of the rail member 26 by a vertical magnetic force generated between the magnet 25 and the rotating member 28. The roller rotation means which rotates while receiving the horizontal transfer force of the roller transfer means 2 and causes the rubber roller 3 to rotate and to horizontally transfer without causing rotation unevenness. In addition, the lower linear transport portion 2B and the curved transport portion 2C,
A fall prevention member 3 is provided at a portion corresponding to a substantially lower half of 2D.
1, 32 and 33 are provided continuously (see FIG. 1).

The support bracket 27 is provided, via a mounting bracket 35, with a chain guide 34 in which each chain link 15a of the chain belt 15 is engaged in parallel with the rail member 26, so that the straightness of roller conveyance can be improved. As a result, stable conveyance is performed.

As shown in detail in FIGS. 6 and 7, the roller receiving member 22 is erected on the chain link 15a of the chain belt 15, and an intermediate portion of the shaft member 24 is provided with a bearing member 23 above the roller receiving member 22. A concave portion 22a that is rotatably supported through the recess 22a is formed. The upper portions of the corresponding left and right roller receivers 22, 22 are connected to each other via a left-right connecting plate 41 so as to maintain a constant interval therebetween.

As described above, the coating is applied to the roller surface of each rubber roller 3 by transporting the coating on the coating tank 4 in which the coating is stored in an overflow state while rotating the rubber roller 3. As shown in FIGS. 8 and 9, the coating tank 4 has a parallelogram shape in which the center line is inclined at a fixed angle (15 ° in this example) with respect to the conveyance direction of the rubber roller 3 in plan view. Is formed. Around the coating tank 4, there is provided a round receiving tank 51 which is slightly lower in height than the coating tank 4 and receives the paint overflowed from the coating tank 4.
A paint supply elbow 4a is connected to the center of the bottom surface of the coating tank 4, and a paint discharge pipe 51b is connected to a corner bulging portion 51a of the orbiting receiving tank 51.

With the above construction, the rubber roller 3
Is fed from the roller feeding portion of one curved transfer portion 2C, and each rubber roller 3 is conveyed while rotating with its axis being horizontal in the upper linear transfer portion 3A. At the time of transport, first, the coating material is uniformly applied to the roller surface by passing over the coating tank 4 where the coating material is stored in an overflow state, and the drying furnace 5 is continuously rotated while maintaining the rotation state. And hot air drying is performed, and the coating and drying of the paint are efficiently performed continuously. When the paint is applied repeatedly, the rubber roller 3 is conveyed to the lower linear conveying portion 2B via the other curved conveying portion 2D without being carried out by the roller removing device 16 after drying by the drying furnace 5. Is cooled in the lower linear transport portion 2B. Then, it reaches the upper linear transport portion 2A via one curved transport portion 2C, and the coating and drying of the paint is performed again, and this is repeated as necessary. In this case, when the paint is applied repeatedly, the lower linear transport portion 2B functions as a cooling zone after the application and drying, except for the final application and drying. In particular, since the rubber roller is not immersed in the paint as in the prior art, the core 3a does not touch the paint, and the paint does not stain the end of the core 3a.

The coating tank 4 is formed in a parallelogram shape whose center line is inclined at a fixed angle with respect to the conveying direction of the rubber roller 3 in a plan view. As the roller 3 is conveyed while rotating, the roller surface is gradually applied in a spiral form from one end to the other end, and finally, without causing a problem of dripping, It is drained at the other end. Therefore, it becomes possible to avoid problems such as foaming at the time of charging and occurrence of traces of liquid, which is a problem when the shape of the coating tank is a normal tank shape that is rectangular in plan view. Further, since the coating tank 4 stores the coating material in an overflow state, the coating material is conveyed while rotating the rubber roller 3 along the flat rail member 26, so that the coating of the coating material on the roller surface can be easily performed. It can be carried out. In addition, since the surrounding tank 51 for receiving the overflowed paint is provided around the coating tank 4, there is no risk of soiling the surroundings, and the received paint is collected through the paint discharge pipe 51 b.
It can be reused by returning to the coating tank 4 through the paint supply elbow 4a.

Further, since the left and right roller receiving members 22, 22 for supporting the ends of the rubber roller 3 are connected to each other by the connecting plate 41, the left and right roller receiving members 22, 22 are connected.
By keeping the distance between them constant, it is possible to eliminate the shift in the left-right direction in the progress of the rubber roller 3 and to perform stable application of the paint.

In the above embodiment, the present invention is applied to an apparatus for applying a paint. However, the present invention is not limited to this, and any other apparatus for applying a liquid coating material may be applied. can do.

[0036]

The present invention is embodied in the form described above, and has the following effects.

According to the first aspect of the present invention, as described above, the coating material is applied spirally to the roller surface by gradually coming into contact with the coating material from one end side of the roller to be processed, and from the one end side. Since the contact with the coating material is gradually released and the liquid is finally broken at the other end, problems such as foaming and traces of liquid dripping are avoided, and the liquid coating material is uniformly applied to the roller surface. Can be applied. In addition, unnecessary portions of the roller to be processed (e.g., ends of the metal core) can be prevented from coming into contact with the coating material, so that such portions are prevented from being contaminated with the coating material. it can.

According to a second aspect of the present invention, the storage tank is provided in a plan view.
Since the center line is formed in a parallelogram shape that is inclined at a fixed angle to the roller transport direction, a coating material is applied spirally on the surface of the roller to be processed,
Problems such as traces of liquid dripping can be avoided, and since the liquid is finally drained at an end different from the end where the coating is started, the liquid coating material can be uniformly applied to the roller surface. Can be applied.

According to the third aspect of the present invention, since the coating material overflowed by the receiving tank is received, there is no possibility that the surroundings will be soiled, and the received coating material can be reused by collection.

According to the fourth aspect of the present invention, since the left and right roller receiving members for supporting the roller to be processed are connected by the connecting plate,
The distance between the left and right roller receivers is maintained, the support of the rollers is stabilized, the conveyance can be stably performed, and the application unevenness is eliminated.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an apparatus for applying a coating material to a roller surface according to the present invention.

FIG. 2 is an enlarged front view of a side where a coating tank is provided.

FIG. 3 is an enlarged side view of the same.

FIG. 4 is a perspective view of a rubber roller.

FIG. 5 is an enlarged view of a main part of FIG. 3;

FIG. 6 is an enlarged front view of a part of the chain belt.

FIG. 7 is a side view of the same part omitted.

FIG. 8 is a plan view of a coating tank.

9 is a sectional view taken along line AA of FIG.

10A and 10B show a conventional example, in which FIG. 10A is an explanatory diagram of a dip process, FIG. 10B is an explanatory diagram of a rubber roller after the dip process,
(C) is an explanatory view in the case of overpainting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Apparatus for applying paint to the roller surface 2 Roller conveying means 2A Upper straight conveying part 3 Rubber roller 4 Coating tank 22 Roller receiver 25 Magnet 26 Rail member 41 Connecting plate 51 Loop receiving tank

Claims (4)

[Claims] An apparatus for applying a coating material to a roller surface, wherein the coating material is applied to a roller surface by rotating and transporting a roller to be processed over a storage tank in which a liquid coating material is stored. The storage tank has a shape that gradually comes into contact with the coating material from one end side of the processing target roller and gradually releases the contact with the coating material from the one end side to the roller surface. Coating material coating equipment. 2. The coating material on a roller surface according to claim 1, wherein the storage tank is formed in a parallelogram shape whose center line is inclined at a fixed angle with respect to the roller transport direction in plan view. Coating equipment. 3. An apparatus for applying a coating material to a roller surface according to claim 1, wherein said storage tank has a receiving tank for receiving a coating material overflowed around the storage tank. 4. The roller to be processed is transported by roller transporting means having a pair of left and right chain belts, the roller transporting means comprising: a left and right roller receiver attached to a chain link of the chain belt; 2. A connecting plate for connecting the left and right roller receiving members.
4. An apparatus for applying a coating material to a roller surface according to any one of claims 3 to 3.