JPH0651533U - Elastic roll for copier - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an elastic roll for a copying machine, which has stable rotation and is excellent in various performances. [Structure] An elastic roll for a copying machine, in which an elastic layer 2 having a spiral convex portion 3 is formed on a surface of a shaft 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is an elastic roll for a copying machine, and more specifically, a cleaning roll for removing the toner remaining on the fixing roll of the copying machine, a pressing roll for pressing the cleaning web for removing the residual toner on the fixing roll, or The present invention relates to an elastic roll that can be used as a transport roll used when transporting paper.

[0002]

[Prior art]

 As a cleaning roll for removing the toner remaining on the fixing roll of a copying machine, for example, Japanese Patent Application Laid-Open No. 61-102677 discloses a spline shaft-shaped cleaning material. However, since this cleaning material has a convex portion and a groove portion in the axial direction, the thickness of the cleaning material is different when the convex portion is in contact with the fixing roll and when the groove portion is in contact. Since it is extremely different, the rotation of the cleaning material is unstable and there is a problem that cleaning cannot be performed uniformly.

[0003]

[Problems to be solved by the device]

 The present invention has been made to solve the above-mentioned problems, and the rotation of the elastic roll is stable, and the cleaning roll can perform uniform cleaning, the pressing roll of the cleaning web that can press uniformly, or the smooth transfer. An object of the present invention is to provide an elastic roll for a copying machine such as a paper transport roll that can be used.

[0004]

[Means for Solving the Problems]

 The elastic roll for a copying machine according to the present invention has a shaft 1 on which an elastic layer 2 having a spiral convex portion 3 is formed. In addition, when only the surface portion 4 of the convex portion 3 of the elastic layer 2 is polished, the cleaning property is more excellent.

[0005]

[Action]

 The elastic roll for a copying machine of the present invention (hereinafter referred to as "elastic roll 6") will be described based on the case where it is used as a cleaning roll for removing the toner remaining on the fixing roll. Since the elastic roll 6 of the present invention forms the elastic layer 2 having the spiral convex portion 3, many convex portions 3 are always in contact with the fixing roll. Therefore, the rotation of the elastic roll 6 is stable, and the toner on the fixing roll is sequentially picked up little by little as the fixing roll and the elastic roll 6 rotate, so that the cleaning property is excellent. . Further, the toner retaining property by the groove portion 5 of the elastic layer 2 is also excellent.

Further, since the elastic roll 6 of the present invention uses an elastic body and a small pressing force to the fixing roll is required, the elastic body layer 2 can be easily rotated, wear is little, and the service life is long. become longer.

The protrusion 3 of the elastic layer 2 of the elastic roll 6 of the present invention is formed in a spiral shape so as to continuously contact the fixing roll at many points. The convex portion 3 may have any cross-sectional shape. For example, as shown in FIG. 2A, the convex portion 3 spreads toward the surface portion 4 of the convex portion 3, and the groove portion 5 has an arc shape. ), The groove 5 has a U-shape, the groove 5 has a V-shape, or the groove 5 extends straight toward the surface 4 of the protrusion 3 as shown in FIG. 2C. The groove 5 may be V-shaped, and the groove 5 may be fan-shaped as shown in FIG. 2D, and the shape is not particularly limited. 2A to 2D exemplify the elastic body layer 2 having the same shape and the same protrusion 3 having the same size, but it does not have to have the same shape or the same size.

The number of the protrusions 3 in the cross section of the elastic layer 2 may be one or more, and in the case of forming a uniform spiral shape, it is four or more, and more preferably eight or more. There is no particular upper limit, but 64 or less is suitable for manufacturing, and 32 or less is more preferable. Further, as shown in FIG. 1, the convex portion 3 may have a continuous spiral state or a discontinuous spiral state in the axial direction of the shaft 1. The spiral state may be regularly changed such that a symmetrical spiral state is formed with the midpoint of the axis of the shaft 1 as a boundary. In the case of this example, equal forces acting in different directions act on the right side and the left side with respect to the midpoint of the axis of the shaft 1, so that the paper can be stably transported when it is transported. There are features such as.

The height from the groove portion 5 to the surface portion 4 of the convex portion 3 is preferably 0.5 to 6 mm. If it is less than 0.5 mm, it comes in contact with the fixing roll substantially linearly, so that the cleaning property is poor and the toner retaining property by the groove portion 5 is also poor, and conversely, if it exceeds 6 mm, This is because the convex portion 3 is likely to bend when it comes into contact with the fixing roll, and the cleaning tends to be unstable.

Further, as shown in FIG. 1, it is preferable that the convex portions 3 have a spiral shape in which the distance between the center lines of the convex portions 3 is 4 to 50 per 10 cm. If the number of protrusions 3 is less than 4 per 10 cm, the contact point of the elastic roll 6 with the fixing roll is small, so that the cleaning cannot be performed uniformly. On the contrary, the number of protrusions 3 per 10 cm is less than 50. This is because if there is too much, it will be too smooth and will make substantially linear contact, and there will be no escape of force, and the effect of the elastic roll will not be able to be exerted. More preferably, the number is 10 to 35 per 10 cm.

Examples of the elastic body of the present invention include, but are not limited to, silicone rubber, natural rubber, SBR, butyl rubber, chloroprene rubber, polysulfide, fluororubber, urethane rubber, acrylic rubber, and nitrile rubber. When used as a cleaning roll for a fixing roll or a pressing roll for a cleaning web, since heat resistance is also required, silicone rubber or fluororubber can be preferably used. It is a more preferable embodiment to mix conductive particles such as carbon black into these elastic bodies, because imparting conductivity to the elastic bodies also results in excellent static elimination.

When the elastic body of the present invention has an Asker hardness of 40 ° or more, it has appropriate elasticity, and in particular, the shape retaining property of the convex portion 3 is also excellent, so that the cleaning property is excellent and the fixing roll is also excellent. Since the pressing force on the elastic roll 6 may be small, the elastic roll 6 can be easily rotated, wear is reduced, and the service life is extended. Further, when the elastic body has an Asker hardness of 40 ° or more, there is an advantage that the elastic body can be easily polished. The Asker hardness is a value measured by an Asker hardness meter (Asker C type, manufactured by Kobunshi Keiki Co., Ltd.).

Further, in the present invention, it is preferable to polish only the surface portion 4 of the convex portion 3, that is, the portion in contact with the fixing roll. The elastic layer 2 of the present invention can be obtained by a molding method such as compression molding, injection molding, transfer molding, or extrusion molding, which is obtained by the molding method. Since the elastic body has a film-shaped skin layer on its surface, the surface portion 4 of the convex portion 3 that comes into contact with the fixing roll increases the frictional resistance to some extent by polishing to stabilize the rotation without slipping. However, the skin layer, particularly the skin layer at the boundary between the surface 4 and the groove 5 of the convex portion 3 has a blade effect that prevents toner from leaking completely. Therefore, the portion other than the surface is not polished. Is preferred.

The method of manufacturing the elastic roll 6 of the present invention is not particularly limited. For example, the elastic body as described above is molded to have the convex portion 3, and the shaft 1 is inserted and then twisted. Method, the elastic body is extruded so as to have the convex portion 3, and at the same time, the elastic body is twisted, and then inserted into the shaft 1, and the elastic body having a hollow portion extending in the axial direction of the shaft in a cross section is molded to form the shaft 1. After insertion, a method of forming the hollow portion as the groove 5 by a method such as polishing or cutting, or by molding an elastic body having a donut-shaped cross section and inserting the shaft 1 and then polishing or cutting There is a method of forming the groove portion 5 by a method.

By winding a fiber sheet such as a woven fabric, a knitted fabric or a non-woven fabric, particularly a woven fabric or non-woven fabric having excellent dimensional stability, around the surface of the elastic roll 6 of the present invention, the toner removing property by the fiber is excellent. Not only does it have the ability to utilize the porosity of the fiber sheet, it is also excellent in retaining toner and retaining dust generated from paper. Furthermore, since a release agent such as silicone oil can be held on the fiber sheet, the toner removability can be further improved.

When the elastic roll 6 wound with the above fiber sheet is used as a cleaning roll for a fixing roll or a pressing roll for a cleaning web, the fiber sheet itself needs to have heat resistance, so that the melting point Alternatively, a decomposition point of 200 ° C or higher, for example, meta-aramid fiber, para-aramid fiber, polyamideimide fiber, polytetrafluoroethylene fiber, aromatic polyetheramide fiber, polybenzimidazole fiber, polyester fiber, vinylon fiber, etc. It is preferably used as a constituent fiber. These constituent fibers are processed into a woven fabric such as a plain weave, a twill weave, and a satin weave, or a non-woven fabric by a method such as entanglement with a needle or fluid flow, fusion with a heat-fusible fiber, or adhesion with a heat-resistant adhesive, and then elastic roll Wind on the surface.

Examples of the elastic roll of the present invention will be described below, but the invention is not limited to the following examples.

[0018]

【Example】

 (Example) Polyorganosiloxane was used as a main raw material, a vulcanizing agent and a foaming agent were added, and a silicone composition (U-Compound, manufactured by Shin-Etsu Chemical Co., Ltd.) having an Asker hardness of 41 ° was prepared. . The silicone composition was extruded with an extruder in which a core metal for a shaft having a diameter of 6 mm was placed at the center of a mold having a diameter of 20 mm, and eight V-shaped molds were radially and evenly arranged on the core metal. After foaming and curing in a heat treatment furnace at a temperature of ℃, it has eight continuous convex portions 3 of the same shape and the same size as shown in FIG. 2 (c), from the groove portion 5 to the surface portion 4 of the convex portion 3. An elastic body having a height of 4 mm and an outer diameter (distance between the surface portions of the convex portions 3 on the diagonal) of 21 mm was obtained.

The elastic body having the convex portion 3 is cut into a length of 300 mm, the aluminum shaft 1 having a diameter of 6 mm coated with silicone adhesive is inserted into the hollow portion at the center, and then twisted and heat treated. After adhering, only the surface portion 4 of the convex portion 3 was polished to obtain an elastic roll 6 having 20 convex portions 3 per 10 cm.

The elastic roll 6 was used as a cleaning roll for the fixing roll (temperature: 200 ° C.) which was subjected to the Teflon release treatment of the copying machine, after being used for 12 hours and then being stopped for 12 hours, which was repeated 30 times. No elastic toner remained on the fixing roll, and the elastic roll 6 was excellent in toner removability.

(Comparative Example) An elastic body having eight convex portions parallel to the axial direction of the shaft adhered to the shaft surface in exactly the same manner as in the Example except that the shaft of the aluminum shaft was not twisted. Got a sex roll. As a result of investigating the toner removability of this elastic roll in the same manner as in the example, the pressure of the elastic roll on the fixing roll was non-uniform, the rotation of the elastic roll was stopped during the test, etc. It was a bad thing.

[0022]

[Effect of device]

 Since the elastic roll for a copying machine of the present invention forms an elastic layer having a spiral convex portion, a large number of convex portions are always in contact with the fixing roll. Therefore, the rotation of the elastic roll is stable, and the toner on the fixing roll is sequentially picked up little by little as the fixing roll and the elastic roll rotate, so that the cleaning property is excellent. In addition, the toner retaining property by the groove portion of the elastic layer is also excellent.

Further, when the elastic layer in which only the surface of the convex portion is polished is used, the elastic roll for a copying machine is excellent in cleaning property without any leakage of toner.

As described above, the elastic roll for a copying machine according to the present invention includes a cleaning roll for removing the toner remaining on the fixing roll, a pressing roll for pressing the cleaning web for removing the residual toner on the fixing roll, or a paper roll. It can be suitably used as a carrying roll or the like used for carrying.

[Brief description of drawings]

FIG. 1 is a plan view of an elastic roll for a copying machine according to the present invention.

FIG. 2A is an example of a sectional view of an elastic roll, FIG. 2B is an example of a sectional view of an elastic roll, and FIG. 2C is an example of sectional view of an elastic roll.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft 2 Elastic body layer 3 Convex part 4 Surface part 5 Groove part 6 Elastic roll

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display area G03G 21/00 111 // B65G 45/10

Claims (2)

[Scope of utility model registration request] 1. An elastic roll for a copying machine, wherein an elastic layer 2 having a spiral convex portion 3 is formed on a surface of a shaft 1. 2. The elastic roll for a copying machine according to claim 1, wherein only the surface portion 4 of the convex portion 3 of the elastic layer 2 is polished.