JP4310155B2 - Multilayer roll manufacturing method and apparatus - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a multi-layer roll used in an image apparatus such as a copying machine, a printing machine, and a facsimile, and a manufacturing apparatus therefor. It relates to a manufacturing apparatus.

  In developing devices such as copying machines, printing machines and facsimile machines, laser beams are often applied. The OA equipment laser beam developing machine uses various rolls such as a developing roll, a charging roll, a toner transport roll, a transfer roll, a photosensitive drum cleaning roll, a fixing roll, and a pressure roll. The fixing roll and the pressure roll have an elastic layer and face each other across the moving path of the printing sheet. Among them, the fixing roll contacts the printing surface of the moving printing sheet, and the pressure roll contacts the opposite non-printing surface.

  Conventionally, a pressure roll is used in a fixing device disposed in an electrophotographic image forming apparatus such as a copying machine, a laser beam printer, or a facsimile. The pressure roll uses solid or sponge silicone rubber for the elastic layer.

  In the laser beam fixing device, for example, a sponge-like silicone foam elastic body roll or the like is used. In this case, a multi-layer roll having a fluorine resin layer as a skin layer and a skin layer covering the surface thinly is used. The need for a skin layer is due to the strong demand for excellent mold release characteristics. The laser beam fixing device uses a thermal fixing method. The background of the heat fixing method is that toner is used for image fixing, and printing has been accelerated and refined.

  It is not easy to cover the surface of the sponge-like foamed elastic body with a thin skin layer. For example, a heated cylindrical mold is filled with resin powder to form a skin layer in which the resin is melted on the inner peripheral surface, and the remaining After removing the resin powder from the cylindrical mold, insert the cored bar into the cylindrical mold, and then inject liquid resin into the gap between the cylindrical mold and the cored bar to cure the foam. For example, refer to Patent Literature 1).

In addition, in some cases, a fluororesin film-like cylinder serving as the skin layer is introduced into the cylinder, and a primer is applied to the inner surface of the film-like cylinder, while a foaming agent and a wrap around the metal core A columnar body is formed by coating with a silicone compound containing an agent, and the columnar body is inserted into a film-shaped cylinder and the cylindrical mold is heated to foam and cure the silicone compound to form a fluororesin film. A method of integrating the cylindrical body and silicone rubber, which is a foamed elastic body, has also been adopted.
JP 2000-355057 A

  A film-like cylinder has no core and is unstable in shape, and it is not easy to fix such a position in a mold. It is relatively rare for the entire columnar silicone rubber compound to foam uniformly at a constant rate in a film-like cylinder, and the skin layer tends to wrinkle. There is often a problem to be solved that yield is poor and production efficiency is low.

  Heat foaming is performed at about 350 ° C. Often uses cheap fire. When using fire, not only the danger of the fire itself, but also a problem to be solved that the high temperature region is biased and the yield is poor.

  Accordingly, an object of the present invention is to provide a method for manufacturing a multi-layer roll and an apparatus for manufacturing the same, in which the skin layer is hardly wrinkled, yield, production efficiency and safety are high.

  In order to achieve this problem, the following measures were taken.

  In manufacturing the multilayer roll which the cylindrical skin body covers the outer periphery of the cylindrical elastic body which is the precursor according to the first aspect of the present invention, the inlet side and the inner diameter are larger than the outer diameter of the cylindrical elastic body. A different-diameter body having a small outlet side is provided, the cylindrical elastic body is press-fitted therein, and the outer diameter of the cylindrical elastic body is once compressed according to the diameter of the outlet side, so that the outer diameter can be completely restored. Inserted into the cylindrical skin body at the outlet side portion during the period, the outer diameter is restored in the cylindrical skin body, and the periphery of the cylindrical elastic body is closely attached to the inside of the cylindrical skin body It is the manufacturing method of the multilayer roll made into.

  According to a second aspect of the present invention, in addition to the method for producing a multilayer roll according to the first aspect, the cylindrical elastic body is a sponge-like foam.

  In addition to the method for producing a multilayer roll according to claim 1 or 2, the invention described in claim 3 applies a primer to at least one of the outer periphery of the cylindrical elastic body and the inner periphery of the cylindrical skin body. Next, the cylindrical elastic body is inserted into the cylindrical skin body, and after the outer diameter is restored, the applied primer is cured.

  Invention of Claim 4 is a manufacturing apparatus of the multilayer roll which a cylindrical skin body closely_contact | adheres the outer periphery of the cylindrical elastic body which is a precursor, Comprising: An entrance with an internal diameter larger than the outer periphery of the said cylindrical elastic body And an outlet having a smaller inner diameter than the outer periphery of the cylindrical elastic body, and an insertion portion for inserting the cylindrical elastic body into a cylindrical shape of the cylindrical skin body is provided on the different diameter body. It is a manufacturing apparatus of the multilayer roll provided around the exit part.

  According to a fifth aspect of the present invention, in addition to the multilayer roll manufacturing apparatus according to the fourth aspect, the different-diameter body is formed of a mortar body having open ends, and the cylindrical skin body is inserted into the cylindrical body. The portion extends from the mortar body outlet with the same central axis, and the lower end of the straight pipe is aligned with the central axis of the outlet portion of the different diameter body. Yes.

  According to the multilayer roll manufacturing method and manufacturing apparatus of the present invention, wrinkles are less likely to occur in the cylindrical skin body. The manufactured multilayer roll has almost no wrinkles on the surface skin layer. This has the effect of improving yield and production efficiency.

  That is, according to the first aspect of the present invention, the different diameter body is provided and the outer diameter of the cylindrical elastic body is once sufficiently compressed according to the diameter on the outlet side. Since the insertion into the cylindrical skin body is performed after sufficient compression, no heat is involved in the close contact between the cylindrical elastic body as the precursor and the cylindrical skin body. No temperature excursion occurs in close contact. The different diameter body compresses the cylindrical elastic body in accordance with the diameter on the outlet side, and the compressive stress is uniformly diffused inside the cylindrical elastic body prior to the close contact with the cylindrical skin body. The tubular skin body is less likely to wrinkle.

  In the invention described in claim 2, the cylindrical skin body is formed on the surface of the sponge-like foam.

  In the invention according to claim 3, since the cylindrical elastic body is coated with a primer around, the cylindrical skin body can be adjusted in position even after the cylindrical elastic body restores the outer diameter, The generation of wrinkles can be more effectively prevented. Next, the position of the cylindrical skin body is fixed by curing the primer.

  In the invention according to claim 4, the different-diameter body compresses the outer diameter of the cylindrical skin body in accordance with the inner diameter on the outlet side. The cylindrical skin body is inserted into the cylindrical shape around the outlet portion of the different diameter body. There is no heat in contact between the cylindrical elastic body as the precursor and the cylindrical skin body. No temperature excursion occurs in close contact. The compressive stress is uniformly diffused inside the cylindrical elastic body prior to the close contact with the cylindrical skin body. Therefore, wrinkles are less likely to occur in the cylindrical skin body.

  In the invention described in claim 5, the different-diameter body is formed of a mortar body that is open at both ends, and the columnar elastic body is reduced in diameter along the mortar-shaped slope, toward the outlet of the bowl body, and enters the straight pipe. To do.

  An embodiment of the present invention will be described below.

  In one embodiment of the present invention, a cylindrical skin body covers the outer periphery of a cylindrical elastic body that is a precursor. In producing the multi-layer roll, in the best mode, for example, it is carried out by the following production apparatus.

  FIG. 1 is a cross-sectional view of the best mode of a multi-layer roll manufacturing apparatus according to the present invention.

  The apparatus for producing a multilayer roll according to this embodiment is formed of a mortar-shaped different-diameter body 1 and a straight tube 2 directly connected to the different-diameter body 1. The different diameter body 1 is provided in the shape of a mortar that is open at both ends and has different mouth inner diameters. The large-diameter opening 1a is directed upward as an entrance, the small-diameter opening 1b is directed downward as an exit, its central axis is set in the vertical direction, and is attached to the horizontal table 3. In the opening 1b on the outlet side, a straight tube 2 with the central axis overlapped with the central axis of the mortar is extended, and the cylindrical elastic body is placed into the cylindrical shape of the cylindrical skin body with the lower end of the straight tube 2. It is an insertion part to be inserted.

  The inner diameter of the large-diameter opening 1a of the different-diameter body 1 is sufficiently larger than the outer diameter of the cylindrical elastic body that is the precursor. The small-diameter side opening 1b is slightly smaller than the outer diameter of the cylindrical elastic body that is the precursor, and is formed so that the cylindrical elastic body can be inserted in a contracted state. The straight pipe 2 has no step on the inner peripheral surface of the small-diameter opening 1b, and the direct connection part of both forms a gentle curved surface like a bow. The outer diameter of the straight tube 2 is smaller than the inner diameter of the cylindrical skin body, and is sized to be easily inserted into the cylindrical skin body.

  The cylindrical elastic body covered with the cylindrical skin body is formed as follows, for example. The core metal and the silicone rubber compound are integrally extruded using a cross head to obtain a roll before vulcanization foaming with the core metal as the central axis. The obtained roll before vulcanization foaming is fixed to a predetermined mold and subjected to heat treatment for foaming. The obtained foam roll is further subjected to secondary vulcanization using a gear-oven or the like to stabilize physical properties. It is precisely molded to have a diameter of about 18 mm and a length of about 300 mm to obtain a cylindrical elastic body.

  The silicone rubber compound is prepared by blending a specific silicone raw rubber with a vulcanizing agent, a foaming agent and other necessary compounds. Specific examples of the silicone raw rubber include vinyl group-containing dimethyl silicone raw rubber. Examples of the vulcanizing agent include organohydrodiene polysiloxane and a specific organic peroxide. Examples of the foaming agent include inorganic foaming agents such as sodium bicarbonate, and organic foaming agents such as 1,1'-azo-bis (1-acetoxy-1-phenyl-ethane).

  In the method for producing a multilayer roll according to this embodiment, such a cylindrical elastic body is used as a precursor, and the surface is covered with, for example, a cylindrical skin body formed of a fluororesin, and is brought into close contact.

  Examples of the material of the skin body that covers the outer periphery of the cylindrical elastic body include, for example, a fluorinated ethylene-perfluoroalkyl vinyl ether copolymer (hereinafter referred to as “PFA”), a fluorinated ethylene-propylene copolymer (FEP), Although polytetrafluoroethylene (PTFE) etc. are mentioned, PFA can be used conveniently. The thickness of the fluororesin layer is often 30 μm or more. It is formed into a cylindrical shape with a diameter that closely adheres to the cylindrical elastic body that is the precursor. In consideration of the elasticity of the fluororesin layer, the inner diameter is designed to be about 0.2 mm smaller than 18 mm of the diameter of the cylindrical elastic body. Incidentally, as a guideline, the straight tube should have a thickness of 0.5 mm and an inner diameter of 0.2 to 0.3 mm smaller than 17 mm.

  When a cylindrical elastic body is covered with a cylindrical skin body, a primer is usually applied to the cylindrical elastic body. As the primer, an addition reaction type silicone having a low viscosity is suitable. The thickness is preferably 10 to 100 μm.

  A multilayer roll is manufactured as follows, for example.

  FIG. 2 is a conceptual diagram showing a manufacturing method. As shown in FIG. 2 (a), the straight skin 2 of the multilayer roll manufacturing apparatus is inserted inside the tubular skin body 4, and the straight skin 2 is covered with the tubular skin body 4. From the lower end of the straight tube 2, the lower end of the cylindrical skin body 4 in the vertical direction is slightly protruded, and an protruding portion 4 a is provided.

  A cylindrical elastic body 5 having a cored bar 5a is press-fitted in the direction of an arrow with a work 6 from the upper part of a mortar-shaped different-diameter body 1 of a multilayer roll manufacturing apparatus. If it carries out like this, the cylindrical elastic body 5 will descend | fall within the different diameter body 1. FIG. When a primer is injected into the mortar-shaped different diameter body 1 from the primer introduction tube 7, the cylindrical elastic body 5 descends from the different diameter body 1 through the straight tube 2 while the peripheral surface is wetted by the primer. The cylindrical elastic body 5 is reduced in diameter in accordance with the small-diameter side opening of the different diameter body 1, and descends in the straight tube 2 as shown in FIG. The lower end reaches the lower end of the straight tube 2 and then the lower end of the straight tube 2 is removed. When the lower end of the straight tube 2 is removed, the lower end portion of the cylindrical elastic body 5 enters the protruding portion 4a of the cylindrical skin body 4 before the diameter is restored. The diameter of the lower end portion of the cylindrical elastic body 5 continues to recover there. When the lower end portion of the cylindrical elastic body 5 whose diameter has been restored and the protruding portion of the cylindrical skin body 4 are pulled downward together, the cylindrical elastic body 5 is reduced in diameter while being accommodated in the cylindrical skin body 4. The multilayer roll which restored | restored and the cylindrical skin body 4 was closely_contact | adhered without excessive and insufficient is obtained.

  In this way, the multilayer roll in which the cylindrical skin body is closely adhered without excess or deficiency is then subjected to primer curing treatment. Specifically, heating is performed at about 100 to 150 ° C. lower than the vulcanization temperature.

  Such a multilayer roll is incorporated as, for example, a fixing roll in a paper conveyance path exit portion of a printing machine or the like. An example of the concept of the copying machine incorporated as a fixing roll is shown in FIG.

  A housing 30 having an original placement surface 11 is provided, and a light emitting diode array head 12 is provided above the housing 30. In the housing 30, there is provided a charging roll 13 that reacts magnetically with the reflected light of the light emitted from the light emitting diode to the original plate and takes static electricity. The charging roll 13 is in contact with the photosensitive drum 14, and transfers a mottled electrostatic charge area corresponding to the pattern of the original plate to the photosensitive drum 14. The photosensitive drum 14 is in contact with the developing roll 15. The developing roll 15 is in the EP cartridge 16. In the EP cartridge 16, a toner conveying roll 17 and a toner cartridge 18 are also provided. The developing roller 15 receives toner from the toner cartridge 18 via the toner conveying roller 17. The photosensitive drum 14 receives toner from the developing roller 15 on the mottled charged portion. The photosensitive drum 14 to which the toner adheres faces the high-temperature transfer roll 20 across the conveyance path of the printing paper 19. On the downstream side of the conveyance path, a high-temperature fixing roll 10a and a pressure roll 10b are provided facing each other. The photosensitive drum 14 is also in contact with the cleaning roll 21.

  While the printing paper 19 passes between the photosensitive drum 14 and the high-temperature transfer roll 20, toner is transferred from the photosensitive drum 14 in a mottled pattern at a high temperature. The printing paper 19 that has received the toner transfer is further pressurized at a high temperature between the fixing roll 10 a and the pressure roll 10 b, and the toner is fixed to the printing paper 19. After the toner is transferred to the printing paper 19, the photosensitive drum 14 removes the excess toner with the cleaning roll 21 if it still remains.

It is sectional drawing of one form in the manufacturing apparatus of the multilayer roll concerning this invention. It is a conceptual diagram of the initial process which shows the manufacturing method of the multilayer roll which uses the manufacturing apparatus. It is a conceptual diagram of the intermediate process which shows the manufacturing method of the multilayer roll which uses the manufacturing apparatus. It is a conceptual diagram which shows the example of the copying machine incorporating the multilayer roll as a fixing roll.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mortar-shaped different diameter body 2 Straight pipe 3 Horizontal stand 4 Cylindrical skin body 5 Cylindrical elastic body 6 Workpiece

Claims (5)

In manufacturing a multi-layer roll in which a cylindrical skin body covers the outer periphery of a cylindrical elastic body as a precursor, a different diameter body having an inlet side having an inner diameter larger than an outer diameter of the cylindrical elastic body and an outlet side having a smaller inner diameter. The cylindrical elastic body is press-fitted into the cylindrical elastic body, and the cylindrical elastic body is compressed once according to the outer diameter of the outlet side. A method for producing a multi-layer roll, comprising: inserting into a body, restoring an outer diameter within the cylindrical skin body, and bringing the periphery of the cylindrical elastic body into close contact with the inside of the cylindrical skin body. The method for producing a multilayer roll according to claim 1, wherein the cylindrical elastic body is a sponge-like foam. Apply the primer on at least one of the outer circumference of the cylindrical elastic body or the inner circumference of the cylindrical skin body, and then insert the cylindrical elastic body into the cylindrical skin body and apply after the outer diameter is restored. The manufacturing method of the multilayer roll of Claim 1 or 2 which cure-processes the said primer which was made. An apparatus for producing a multi-layer roll in which a cylindrical skin body covers an outer periphery of a cylindrical elastic body that is a precursor, an inlet having an inner diameter larger than the outer periphery of the cylindrical elastic body, and an inner diameter that is larger than the outer periphery of the cylindrical elastic body A multilayer having a different diameter body having a small outlet, and an insertion portion for inserting the cylindrical elastic body into the cylindrical shape of the cylindrical skin body is provided around the outlet portion of the different diameter body. Roll manufacturing equipment. The different-diameter body is formed of a mortar body that is open at both ends, and the insertion portion of the cylindrical skin body into the cylindrical shape is concentric with a straight tube that can be inserted into the cylindrical skin body from the outlet of the mortar body. The apparatus for producing a multi-layer roll according to claim 4, wherein the apparatus is extended by a shaft, and a lower end of the straight pipe is made to coincide with a central axis of an outlet portion of the different diameter body.

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