JP3940206B2 - Application device for coating material on roller surface - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for applying a coating material onto a roller surface and an apparatus therefor.
[0002]
[Prior art]
Conventionally, rubber rollers such as a developing roller, a charging roller, a transfer roller, and a cleaning roller used in so-called OA equipment such as an electrophotographic apparatus and an electrophotographic apparatus are known.
[0003]
Such a rubber roller is coated with paint on the roller surface. Conventionally, as shown in FIG. 10 (a), the rubber roller 101 is coated with a paint storage tank 103 in which the paint 102 is stored. A dipping method in which the coating is performed by pulling up after being immersed in the inside is employed.
[0004]
[Problems to be solved by the invention]
However, in the case of such a dip method, dripping 102a tends to occur in the length direction (see FIG. 10B). Therefore, it is necessary to reverse the rubber roller and immerse it again in the paint storage tank 103 (see FIG. 10C), and the application work is troublesome. In addition to that, the processing of one rubber roller takes 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 is remarkable.
[0005]
The present invention has been made in view of such a point, and an object of the present invention is to provide a coating material coating apparatus on a roller surface that can efficiently apply a liquid coating material while avoiding the problem of dripping. To do.
[0006]
[Means for Solving the Problems]
The invention of claim 1 is an apparatus for applying a coating material to a roller surface for applying a liquid coating material to the surface of a roller to be processed, and includes an upper linear conveying portion, a lower linear conveying portion, and two connecting them Roller transport means for supporting and transporting the roller to be processed having a curved transport portion in a state where the axis is horizontal, a roller feeding portion provided in one curved transport portion of the roller transport means, and the roller transport A roller unloading portion provided in the other curved conveying portion of the means, a roller rotating means for rotating the processing roller supported and conveyed by the roller conveying means in the upper linear conveying portion, and a roller conveying means. A storage tank provided on one curved conveyance part side in the upper linear conveyance part and storing the coating material in an overflow state, and an upper straight line of the roller conveyance means And a drying means for drying the treated roller coated with the coating material provided continuously in the storage tank in the feeding portion, and the roller rotation means is detachable at one end with respect to the rotating shaft of the treated roller. A roller support member to be coupled; a metal rotation member rotatably provided at the other end of the roller support member; and a rail member having a magnet on a surface thereof and the rotation member rolling on the magnet. It is characterized by that.
[0009]
According to the first aspect of the present invention, the rollers to be processed are introduced from the roller feeding portion of one of the curved conveying portions, and each of the rollers to be processed is conveyed while rotating with the axis thereof being horizontal in the upper linear conveying portion. The At this time, the rotating member rolls on the magnet of the rail member, and the processing target roller supported by the roller supporting member is rotated by the magnetic force in the vertical direction and the conveying force in the horizontal direction.
During the transport, first, the coating material passes over the storage tank in which the coating material is stored in an overflow state, so that the coating material is applied to the roller surface and continuously dried by a drying means while maintaining the rotation state. The liquid coating material is efficiently applied.
[0010]
According to a second aspect of the present invention, in the coating apparatus for applying a coating material to the roller surface of the first aspect , the lower straight conveying portion of the roller conveying means is a cooling zone when the coating material is applied repeatedly.
[0011]
According to the invention of claim 2 , after being dried by the drying means, the roller to be processed is conveyed to the lower linear conveying portion through the other curved conveying portion, cooled in the lower linear conveying portion, and then one curved conveying portion. After passing through the part, it reaches the upper straight conveyance part, and coating and drying of the coating material are repeated again, and the coating material is repeatedly applied.
[0014]
According to a third aspect of the present invention, in the coating apparatus for applying a coating material to the roller surface of the first or second aspect , the roller conveying means has a guide member for ensuring straightness in the upper conveying portion.
[0015]
According to the invention of claim 3 , in the upper conveyance portion, the straightness of conveyance of the processing target roller is ensured by the guide member.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0017]
In FIG. 1 to FIG. 3 showing a schematic configuration of an apparatus according to the present invention, reference numeral 1 denotes a paint coating device for the roller surface. It is applied by passing it over the coating tank 4 (storage tank) where the paint (liquid coating material) is always stored in an overflow state while maintaining the rotation state. As it is, it is made to pass through the drying furnace 5 (drying means) continuously, and is dried with hot air in an atmosphere of 80 to 120 ° C. by the three heater devices 6.
[0018]
The coating tank 4 circulates the coating material and always stores the coating material in an overflow state, so that a constant liquid level is maintained, and two exhaust fan devices are provided below the coating tank 4. 7 is disposed.
[0019]
As shown in FIG. 4, the rubber roller 3 is a roller after completion of vulcanization, in which a cylindrical rubber member 3b is attached to and integrated with the outer peripheral surface of the core metal 3a.
[0020]
By the way, as the rubber member 3b, natural rubber, chloroprene rubber, styrene / butadiene rubber, ethylene / propylene rubber, butyl rubber, acrylic / nitrile / butadiene rubber, silicon rubber, urethane rubber, fluorine rubber, halogenated butyl rubber, chlorosulfonated polyethylene Rubber, hydrogenated nitrile rubber, cross-linked rubber such as epichlorohydrin rubber, and copolymers using these monomers, blends thereof, and polyolefins, polyesters, polyethers, polyamides, It can be suitably selected from thermoplastic elastomers such as polyurethane.
[0021]
The rubber member 3b contains a foaming agent. As the foaming agent, azodicarbonamide, azobisisobutyronitrile, diazoaminobenzene, dinitrosopentamethylenetetramine, p-toluenesulfonyl hydrazide, p, p'-oxybis (benzenesulfonylhydrazide) and the like are preferably used. . It is desirable that the amount of the foaming agent is set so that 0.5 to 50% by volume of the rubber roller 3 obtained by foam molding becomes bubbles. That is, if the amount is less than 0.5% by volume, the initial effect cannot be obtained. On the other hand, if the amount exceeds 50% by volume, the elastic modulus of the rubber roller 3 becomes too low.
[0022]
The rubber member 3b contains an electrical resistance adjusting agent. As the electric resistance adjusting agent, carbon black is suitable, and graphite, conductive metal particles, various surfactants, and the like can also be used. In addition, for the purpose of adjusting the hardness of the rubber roller 3 (low hardness), the rubber material may contain various softening agents. As the softening agent, aromatic oils, naphthenic oils, paraffinic oils, plasticizers such as DOP, DOA, DOS, vegetable oils such as rapeseed oil and coconut oil can be used.
[0023]
Furthermore, rubber chemicals and rubber additives can be blended with the rubber member 3b as necessary. Rubber chemicals and rubber additives include vulcanizing agents such as sulfur and peroxide, vulcanization accelerators such as zinc white and stearic acid, sulfenamide-based, thiuram-based, thiazole-based and guanidine-based additives. Sulfur accelerators, UV absorbers, ozone degradation inhibitors, tackifiers, etc. can be used, and various reinforcing agents, friction coefficient modifiers, silica, talc, clay and other inorganic fillers can be selected arbitrarily Can do.
[0024]
The roller conveying means 2 includes a pair of left and right driving sprockets 12 and 12 that are rotationally driven by a driving motor 11 and a pair of left and right driving shafts 12 and 12 that can be adjusted by an air cylinder 13. 2 and a pair of left and right chain belts 15 and 15 wound between them, an upper straight conveying portion 2A, a lower straight conveying portion 2B, and a curved conveying portion connecting them. 2C, 2D.
[0025]
Then, a roller carrying-in part for carrying in the rubber roller 3 to which the paint is applied to one curved conveying part 2C, and a roller carrying-out part for carrying out the rubber roller 3 to which the paint has been applied and dried to the other curved conveying part 2D. Are provided.
[0026]
The rubber roller 3 transported by the roller transporting unit 2 is applied with the paint on the roller surface and drying of the paint in the upper linear transport part 2A, and is cooled after drying in the lower linear transport part 2B. It is like that. Therefore, in the case of so-called overcoating, which is applied multiple times to form a thick film, the application / drying / cooling cycle is repeated as many times as necessary. Immediately after passing through the straight conveying portion 2A, the roller receiving portion 16a of the roller detaching device 16 is removed and carried out.
[0027]
As shown in detail in FIG. 5, the rubber roller 3 has a shaft member 24 in which both ends of the core metal 3 a are rotatably supported by a roller receiver 22 via a bearing member 23 via a magnet 21. It is connected to one end of the (roller support member). A rail member 26 having a sheet-like magnet 25 (rubber magnetic sheet) at the top is provided via a support bracket 27 along the upper straight conveyance portion 2A in the conveyance path of the rubber roller 3. In this example, the magnet 25 is a rubber magnetic sheet on the rail member 26, but the rail member 26 itself may be a plate that is a magnet instead.
[0028]
Then, on the magnet 25 of the rail member 26, a cylindrical rotating member 28 provided at the other end of the shaft member 24 causes the vertical magnetic force generated between the magnet 25 and the rotating member 28 and the roller conveyance. By rotating in response to the horizontal conveying force by the means 2, roller rotation means is configured to horizontally convey the rubber roller 3 while rotating without causing uneven rotation. Further, drop prevention members 31, 32, and 33 are continuously provided at portions corresponding to substantially lower halves of the lower straight conveyance portion 2B and the curved conveyance portions 2C and 2D (see FIG. 1).
[0029]
The support bracket 27 is provided with a chain guide 34, which is engaged with each chain link 15a of the chain belt 15 in parallel with the rail member 26, via a mounting bracket 35 to ensure straightness of roller conveyance. Stable conveyance is performed.
[0030]
As shown in detail in FIGS. 6 and 7, the roller receiver 22 is erected on the chain link 15 a of the chain belt 15, and an intermediate portion of the shaft member 24 is rotated through a bearing member 23 on the upper portion thereof. A recess 22a is formed to support it. Further, the upper portions of the corresponding left and right roller receivers 22 and 22 are connected to each other via a connecting member 41 in the left and right direction so as to maintain a constant distance therebetween.
[0031]
As described above, the paint is applied to the roller surface of each rubber roller 3 by carrying the rubber roller 3 while rotating on the coating tank 4 where the paint is stored in an overflow state. As shown in FIGS. 8 and 9, the work tank 4 is formed in a parallelogram shape in which the center line is inclined at a certain angle (15 ° in this example) with respect to the conveying direction of the rubber roller 3 in plan view. ing. Around the coating tank 4, there is a circulation receiving tank 51 that is slightly lower in height than the coating tank 4 and receives paint that has flowed over from the coating tank 4. A paint supply elbow 4 a is connected to the center of the bottom surface of the coating tank 4, and a paint discharge pipe 51 b is connected to the corner bulging part 51 a of the circulation receiving tank 51.
[0032]
If comprised as mentioned above, the rubber roller 3 will be thrown in from the roller insertion part of one curved conveyance part 2C, and each rubber roller 3 will be conveyed in the upper side linear conveyance part 3A, rotating the axis line horizontally. . During the conveyance, first, the coating material is uniformly applied to the roller surface by passing over the coating tank 4 in which the coating material is stored in an overflow state, and the drying oven 5 is continuously maintained while maintaining the rotation state. In this case, the hot air is dried, and coating and drying of the paint are efficiently performed continuously. Further, since the rubber roller is not immersed in the paint as in the prior art, the core metal 3a of the rubber roller 3 does not touch the paint, and the end of the core metal 3a is not soiled by the paint.
[0033]
Further, in the case of repeatedly applying paint, after drying by the drying furnace 5, the rubber roller 3 is conveyed to the lower linear conveyance portion 2B via the other curved conveyance portion 2D without being carried out by the roller removing device 16. The lower straight conveying portion 2B is cooled. Then, it passes through the one curved conveying portion 2C to reach the upper straight conveying portion 2A, and the coating and drying of the paint are performed again, and this is repeated as necessary. In this case, the lower straight conveyance portion 2B functions as a cooling zone after application / drying, except for final application / drying, in the case where the paint is applied repeatedly.
[0034]
Further, since the shaft member 24 that supports both ends of the rubber roller 3 is rotatably supported by the roller receiver 22, and the rotating member 28 rolls on the magnet 25 of the rail member 26, it is vertical. By the magnetic force acting in the direction and the conveying force acting in the horizontal direction, the rubber roller 3 connected to the shaft member 24 is rotated without causing uneven rotation, so that the coating and drying of the paint are made uniform, and the liquid dripping This does not cause any problems.
[0035]
In addition, since the chain link 15a of the chain belt 15 is slidably engaged with the chain guide 34 in the upper straight conveying portion 2A of the roller conveying means 2, the chain guide 34 linearly advances the conveyance of the rubber roller 3. Can be ensured, and stable conveyance is performed.
[0036]
In the above embodiment, the present invention is applied to an apparatus for applying a paint, but the present invention is not limited to this, and any other apparatus that applies a liquid coating material can be similarly applied. it can.
[0037]
【The invention's effect】
The present invention is implemented in the form described above, and has the following effects.
[0039]
According to the first aspect of the present invention, the rollers to be processed are introduced from the roller insertion portion of one of the curved conveying portions, and each of the rollers to be processed is conveyed while rotating with its axis line horizontal in the upper linear conveying portion. Since the coating material is applied to the roller surface by continuously passing it and dried by the drying means while maintaining the rotation state, it is easy and efficient without causing problems such as dripping. A series of operations of applying and drying the coating material can be performed.
In addition, the rotating member rolls on the magnet of the rail member, and rotates the processing roller supported by the roller support member by the vertical magnetic force and the horizontal conveying force, so that the rotation is uneven. The roller to be processed can be smoothly rotated without causing unevenness, and the coating and drying of the paint can be performed uniformly over the entire roller surface.
[0040]
In the second aspect of the invention, the lower straight conveying portion of the roller conveying means is used as a cooling zone in the case where the coating material is overcoated, so that the roller to be processed passes through the other curved conveying portion after being dried by the drying means. The coating material is transferred to the lower linear conveying portion, cooled in the lower linear conveying portion, and then reaches the upper linear conveying portion through one curved conveying portion, and the coating material is repeatedly applied and dried again. It is also possible to efficiently perform the overcoating in a small space.
[0042]
According to the third aspect of the present invention, since the upper conveying portion has a guide member for ensuring straightness, it is possible to ensure straightness of conveyance of the processing target roller.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of an apparatus for applying a coating material onto 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 cross-sectional view taken along line AA in FIG.
10A and 10B are diagrams illustrating a conventional example, in which FIG. 10A is an explanatory view of a dip process, FIG. 10B is an explanatory view of a rubber roller after the dip process, and FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Coating material coating apparatus 2 Roller conveyance means 2A Upper linear conveyance part 2B Lower linear conveyance part 2C Curve conveyance part 2D Curve conveyance part 3 Rubber roller 4 Coating tank 5 Drying furnace 15 Chain belt 21 Magnet 22 Roller holder 23 Bearing member 24 Shaft member 25 Magnet 26 Rail member 28 Rotating member 34 Chain guide

Claims (3)

An apparatus for applying a coating material to the surface of a roller for applying a liquid coating material to the surface of the processing roller,
Roller transporting means having an upper straight transporting part, a lower straight transporting part and two curved transporting parts connecting them, and supporting and transporting the processing roller in a state where the axis is horizontal, and the roller transporting means A roller insertion portion provided in one curved conveyance portion, a roller carry-out portion provided in the other curved conveyance portion of the roller conveyance means, and a processing roller supported and conveyed by the roller conveyance means. A roller rotation means that rotates in the upper linear conveyance portion, a storage tank that is provided on one curved conveyance portion side in the upper linear conveyance portion of the roller conveyance means and stores the coating material in an overflow state, and the roller conveyance means comprising of a drying means for continuously provided coating material reservoir to the upper linear conveying portion is dried the treated roller coated,
The roller rotation means includes a roller support member whose one end is detachably connected to the rotation shaft of the processing roller, and a metal rotation member provided rotatably at the other end of the roller support member; An apparatus for applying a coating material onto a roller surface, comprising: a magnet provided on a surface; and the rotating member having a rail member that rolls on the magnet . The lower the linear conveying portion of the roller conveying means, a coating material application device to the roller surface of claim 1, wherein where that is the cooling zone when the recoating the coating material. The apparatus for applying a coating material to a roller surface according to claim 1 or 2 , wherein the roller conveying means has a guide member for ensuring straightness in the upper conveying portion.

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