JP2000326358A - Resin roller and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a resin leak of a molded roller, while the manufacturing cost of resin roller is suppressed by using a core body of the same outer diameter. SOLUTION: This resin roller is manufactured by a method wherein in a mold 1 having a cylindrical mold 13 and core-holding members 14 in both ends of the cylindrical mold 13, a core 21 is arranged, both ends of the core 21 are held by the core holding member 14, and molding resin is poured into the mold 1, and set. In this case, the resin roller has the core 21 of which an outer diameter is the same in the whole length, and a cylindrical resin molded body provided in a central part of the core 21. Seal members 24, 24 are provided around the core 21 near both ends of the molded body. In the seal members 24, 24, the core 21 is arranged in the mold 1 so that the seal member 24, 24 come into contact with an end face of a molding space side of the core holding member 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing roller, a charging roller, and the like incorporated in various apparatuses employing an electrophotographic system such as a laser printer, a copying machine, and a facsimile machine.
The present invention relates to a resin roller such as a transfer roller.

[0002]

2. Description of the Related Art Rollers such as a developing roller, a charging roller, and a transfer roller are incorporated in various apparatuses employing an electrophotographic method, such as a laser printer, a copying machine, and a facsimile machine. One example of such a roller is shown in FIG.

[0003] The roller 10 has a core 21 and a cylindrical molded body 12 formed of resin. For example, as shown in FIG. 8, a mold for forming such a roller 10 is a cylindrical mold 13 and is located at both upper and lower ends of the cylindrical mold 13. A core holding member 14 that holds the inserted core 21 and seals both ends of the cylindrical mold 13. Then, the lower core holding member 14
A resin injection port 16 for injecting a resin material into a roller molding space 15 in a cylindrical mold 13 is formed, and a semicircular nozzle touch portion 19 is provided outside the mold of the resin injection port 16 from a molding machine. The resin material is guided to the roller molding space 15 by pressing the resin injection nozzle 18 of the first embodiment.

After the filling of the resin into the mold is completed, the resin in the roller molding space 15 is cured by heating. After the curing of the resin is completed, the core holding member 14 is removed from the cylindrical mold 1.
3 is pulled up and down along its axial direction, respectively. Next, the molded product (roller) 10 held in the cylindrical mold 13 is taken out by extruding the core 21 into the cylindrical mold 13 or the like.

[0005] By the way, the core 2 is
A concave portion 17 for holding the end portion 21 a of the core body holding member 14 is provided in the concave portion 17.
A gap of 10 to 20 μ is provided between the concave portion 17 and the core body holding member 14 in order to facilitate the insertion of “a” and to consider the variation within the dimensional tolerance of the core body end. Therefore, there is a disadvantage that the resin is injected into the mold at a high pressure, or the resin is leaked from the gap to the outside of the mold due to the high pressure in the mold when the resin expands during heat curing. . The leaked resin adheres to the end 21a of the core body 21 or to the inside of the concave portion 17 of the core body holding member 14. Therefore, after the molded product is released from the mold, each leaked resin is removed. Needed.

Further, a core 21 used for the resin roller is provided.
As shown in FIG. 8, the outer diameter of the central portion of the core 21 and the core 2
If the outer diameter of the core 21 is different from that of the end 21a, and the outer diameter of the center of the core 21 is larger than the outer diameter of the end, the core holding member 14 is brought into contact with the side surface of the center of the core 21. Seal member 2
4 (for example, an O-ring) to prevent resin leakage.

However, the core body 21 having the outer diameters of the center part of the core body 21 and the end part 21a of the core body 21 different from each other is as follows.
1 has the disadvantage that the processing cost and the material cost are high, and the price of the core 21 is high.

Further, in order to reduce the price of the core 21 or to increase the thickness of the elastic layer for the purpose of reducing the rubber elastic hardness of the molded body 12 (elastic layer), the center of the core 21 is The core 21 having the same outer diameter of the end 21a of the body 21 may be used.

In this case, as shown in FIG. 9, a core holding member 1414 is used in which a seal member 24 (for example, an O-ring) is embedded in a portion of the core holding member 14 which opens into the concave portion 17. However, there is a disadvantage that the seal member 24 embedded in the core holding member 14 is damaged when the core 21 is repeatedly mounted in the concave portion 17, and the effect of preventing resin leakage is reduced.

Further, in order to adopt a structure in which the sealing member is embedded in the core holding member 14, in consideration of the strength of the groove to be embedded, 0.5 mm from the end surface of the core holding member 14 on the resin molded product side.
It is necessary to embed about 1 mm to 1 mm deep. for that reason,
0.5 mm to 1 mm from the end face of the resin molded product of the core holding member 14
Until about mm, the resin leakage cannot be stopped by the seal member 24, and the resin leakage 30 will occur accordingly.

[0011]

As described above, when the core 21 having the same outer diameter at the center of the core 21 and the outer diameter at the end 21a of the core 21 is used, the sealing member has a short life, There is a problem that resin leakage occurs from the resin molding end to the seal member.

Therefore, frequent replacement of the seal member due to the short life of the seal member and the operation of removing the resin leaked to the end become indispensable, and the cost of the resin roller increases.

The present invention has been made in view of such a situation, and an object of the present invention is to provide a roller formed by using a core having the same outer diameter at the center of the core and at the end of the core. It is an object of the present invention to provide a resin roller capable of preventing resin leakage.

[0014]

The resin roller according to the present invention comprises:
A core is disposed in a molding die having a cylindrical mold and core holding members attached to both ends of the cylindrical mold, and both ends of the core are attached to the core holding member. In a resin roller manufactured by injecting a molding resin into the mold and curing the resin roller, the resin roller is provided at the center of the core having the same outer diameter over the entire length and at the center of the core. A cylindrical resin molded body, and a seal member is provided around the core body near both ends of the molded body, and the seal member is formed on the molding space side of the core body holding member. The core is disposed in the mold so as to be in contact with the end surface of the mold, whereby the object is achieved.

In one embodiment, a groove for attaching an E-ring to the core is provided, and the E-ring is attached to the groove. The seal member is attached to the core so as to be in contact with an end surface of the core holding member.

In one embodiment, a tubular member is attached to the core, and when the core is disposed in a mold, the tubular member and the end face of the core holding member are in contact with each other. The seal member is attached to the core as described above.

In one embodiment, the seal member is attached to the core, and when the core is disposed in a mold, the end surface of the seal member is connected to the end surface of the core holding member. Touch

In one embodiment, a groove for attaching a seal member is provided in the core body, and when the core body is disposed in a mold, the groove comes into contact with the end face of the core body holding member in the groove. A seal member is provided.

Another resin roller of the present invention is a resin roller having a core having the same outer diameter over its entire length, and a cylindrical resin molded body provided at the center of the core. A seal member is provided around the core in the vicinity of both ends of the molded body, and an end surface of the seal member is the same as or protrudes from an end surface of the molded body.

The method of manufacturing a resin roller according to the present invention comprises the steps of disposing core holding members at both ends of a cylindrical mold and holding the core with both core holding members; A step of injecting and curing a molding resin into a molding space formed between the two core body holding members and forming a resin molded body around the core body,
A method of manufacturing a resin roller, comprising: arranging a seal member around a core near an end of the molded body, and elastically contacting the seal member with an end surface of the core body holding member on a molding space side. In this state, the molding resin is injected into the molding space.

In the case where measures are taken to prevent resin leakage between the core holding member and the core, it is not always necessary to select the same sealing method when both end surfaces of the core are required.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The resin roller of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the molding die 1 has a cylindrical die 13 and a pair of core holding members 14 and 14 disposed at both ends of the cylindrical die 13. The mold 13 and the pair of core holding members 14 form a roller forming space 15. The one core holding member 14 is provided with a resin injection port 16.

The core 21 has the same outer diameter in the longitudinal direction, and the end 21a of the core 21 is
4 is mounted in a recess 17 formed in the same. After the molding, a cylindrical molded body 12 made of resin is formed at the center of the core 21.

The form of the core 21 is specifically shown in FIG.
The materials shown in FIGS. 7A to 7C correspond to any of the materials known as the resin roller core 21, such as a metal material or a resin material having conductivity, for example. It is applicable as the body 21.

The core 21 shown in FIG. 7A is a rod-shaped member having the same outer diameter, and the core 21 shown in FIG. The core 31 shown in FIG. 7C has an engaging portion 31 formed of a plurality of steps at one end.

Although the molding die, the core 21 and the sealing member of the present invention can be applied to any size of a known resin roller, the diameter is generally 10 mm to 30 m.
m, length 200 mm to 400 mm.

The cylindrical mold 13 and the core holding member 14 are
Consisting of any known material used for thermosetting resin molding, preferably, pre-hardened steel, hardened steel,
Non-magnetic steel, carbon tool steel, corrosion-resistant steel (stainless steel), and the like.

The core holding member 14 has a stepped portion 20 around which the cylindrical mold 13 is held, and a concave portion 17 at the center thereof. The molding die 1 is formed by disposing the molding die 1 so as to face both ends of the die 13 and fitting both ends of the cylindrical die 13 to the step portions 20 of the core body holding member 14, respectively. The end of the core 21 is inserted into the concave portion 17 of the core holding member 14 and placed in the molding die 1.

As shown in FIG. 1, the core 21 is provided with a groove 23 for attaching an E-ring 22, and is in contact with the E-ring 22 attached to the groove 23, and
A sealing member 24 is attached so as to be in contact with the end surface 14a of the molding space 4 on the molding space 15 side.

As shown in FIG. 4, the mounting position of the E-ring 22 and the sealing member 24 is the distance L between the end faces of the pair of core holding members 14 with the molding die 1 assembled.
If the distance L2 between the end faces of the seal members 24 at both ends is made longer than 1 and the seal member 24 is compressed and deformed by the pressing force when the core holding member 14 is assembled to the cylindrical mold 13, it is further possible It is more preferable to obtain a sealing effect.

The material of the sealing member 24 is polyethylene,
It is possible to use resin materials such as polypropylene, polyamide, polycarbonate, and polyimide, and resin materials with conductivity added to those resins as needed, and metal materials such as aluminum, brass, and iron. Needless to say, a material that does not melt or deform when heated and hardened is selected.

In particular, as a material which is compressed and deformed by the assembling force of the core body holding member 14 and further has an effect of preventing resin leakage,
Polyvinyl chloride, silicone, polyurethane, EPD
Elastic resin materials such as M and NBR, resin materials having conductivity imparted to those resins as necessary, and metal materials such as copper, brass and phosphor bronze can also be used.

The sealing member 24 is formed by injection molding, extrusion molding,
Manufactured by punching, forging, casting, or the like in the form of a sheet or a plate, the shape is the inner diameter that is in close contact with the core body 21, the thickness is 0.1 mm to 3 mm, and the length is 0.1 mm to 20 m.
m is preferable, the thickness is 0.1 mm to 2 mm, and the length is 1 mm.
mm to 5 mm is more preferable. The cross-sectional shape can be circular, semicircular, elliptical, square, and the like.

It is also possible to form the sealing member 24 by winding the above-mentioned material into a sheet shape and winding a tape coated with an adhesive on the back surface if necessary. Alternatively, using a heat-shrinkable tube made of a heat-shrinkable resin material,
After being attached to the core body 21, it can be heated and shrunk and attached to an appropriate attachment position.

Further, if O-rings or the like mass-produced are used, the O-rings can be obtained at a low cost and the cost can be further reduced. For example, when a commercially available O-ring is used as the sealing member, when the outer diameter of the core body 21 is 5 to 10 mm, the O
The diameter of the cross section of the ring is usually 1.9 mm, and it is more preferable to set the distance L2 between the end faces of the pair of seal members 24 so that the O-ring is compressed by 0.5 mm by the assembling force of the core holding member 14.

FIG. 2 shows another embodiment.

A cylindrical member 25 is attached to the core 21,
A seal member 24 is attached to the core 21 so as to be in contact with the cylindrical member 25 and with the end surface 14 a of the core holding member 14 on the molding space side. The cylindrical member 25 is
As a method of attaching the molded body 12, methods such as bonding, caulking, press-fitting with a strong fitting dimension, and insert molding into the core body 21 can be adopted, and any of them does not easily move due to vibration or expansion pressure during molding of the molded body 12. Adopt the method.

The material of the cylindrical member 25 may be a resin material such as polyethylene, polypropylene, polyamide, polycarbonate, polyimide, or the like, or a resin material provided with conductivity as required, or aluminum, brass, iron, copper, or the like. It is possible to use a metal material such as phosphor bronze or the like. It goes without saying that a material that does not melt or deform when heated and cured after injecting the resin is used.

In particular, as a method of attaching to the core 21,
To press-fit with strong fitting by using the elasticity of resin, polyvinyl chloride, silicone, polyurethane, EPDM, NBR
Elastic resin materials such as these, and resin materials obtained by imparting conductivity to those resins as necessary are also possible.

It is also possible to form the sealing member 24 by forming the above-mentioned material into a sheet and winding a tape coated with an adhesive on the back surface if necessary. Alternatively, using a heat-shrinkable tube made of a heat-shrinkable resin material,
After being attached to the core body 21, it can be heated and shrunk and attached to an appropriate attachment position.

The size of the cylindrical member is 0.5 mm to 3 mm in thickness.
mm and a length of 2 mm to 20 mm are preferable, and a thickness of 0.5 mm to 2 mm and a length of 2 mm to 10 mm are more preferable.

The mounting positions of the cylindrical member 25 and the seal member 24 are also smaller than the distance L1 between the end surfaces of the pair of core body holding members 14 in a state where the mold is assembled in the same manner as described above. It is more preferable to increase the distance L2 so that the sealing member 24 is compressed and deformed by the pressing force when the core body holding member 14 is assembled to the cylindrical mold 13 to further obtain the sealing effect.

The material, size and shape of the seal member 24 are the same as those of the above-described embodiment.

FIG. 3 shows still another embodiment.

A cylindrical sealing member 26 is attached to the core 21 so as to be in contact with the end surface 14a of the core holding member 14 on the molding space side. The attaching method may be adhesion, caulking, or strong fitting dimensions. Methods such as press-fitting and insert molding into the core body 21 can be adopted. Particularly, in the case of an elastic resin material such as synthetic rubber which is elastically deformed by pulling,
It is also effective to select one having an inner diameter smaller than that of the core body 21 and press-fit it. In any case, it goes without saying that a method that does not easily move due to vibration or expansion pressure during molding of the molded body 12 is adopted.

The position at which the cylindrical seal member 26 is attached is set such that the distance L2 between the end surfaces of the cylindrical seal members 26 at both ends is longer than the distance L1 between the end surfaces of the pair of core body holding members 14 in a state where the mold is assembled. It is more preferable that the sealing member 24 be compressed and deformed by a pressing force when the core body holding member 14 is assembled to the cylindrical mold 13 in order to further obtain a sealing effect.

The material of the cylindrical sealing member 26 is polyethylene, polypropylene, polyamide, polycarbonate,
Resin materials such as polyimide, and resin materials and aluminum, brass, iron, and the like that have been provided with conductivity as required for those resins.
It is needless to say that a material that does not melt or deform when heated and cured after injecting the resin can be used.

In particular, when an effect of compressing and deforming by the assembling force of the core body holding member 14 and further preventing the resin from leaking is expected, polyvinyl chloride, silicone, polyurethane, EPDM,
It is also possible to use an elastic resin material such as NBR, a resin material imparted with conductivity to the resin as required, or a metal material such as copper, brass, phosphor bronze.

The sealing member 26 is formed by injection molding, extrusion molding,
It is manufactured by punching, forging, casting, or the like into a sheet or a plate, and has a shape having an inner diameter in close contact with the core 21, a thickness of 0.01 mm to 3 mm, and a length of 0.5 mm to 20 mm.
mm is preferable, and the thickness is 0.01 mm to 2 mm.
And the length is more preferably 1 mm to 5 mm. The cross-sectional shape can be circular, semicircular, elliptical, square, and the like.

It is also possible to form the sealing member 26 by winding the above-mentioned material into a sheet shape and winding a tape coated with an adhesive on the back surface if necessary. Alternatively, a heat-shrinkable tube or the like made of a heat-shrinkable resin material may be used, and the heat-shrinkable tube may be mounted on the core body 21 and then heat-shrinked to be mounted at an appropriate mounting position.

FIG. 5 shows another embodiment.

A groove 27 for mounting the seal member 24 is provided in the core body 21, and the end face 1 of the core body holding member 14 is provided in the groove 27.
A seal member 24 is attached so as to be in contact with 4a. The mounting position of the seal member 24 is set such that the distance L2 between the end faces of the seal members 24 at both ends is longer than the distance L1 between the end faces of the pair of core body holding members 14 in a state where the mold is assembled. It is more preferable that the sealing member 24 be compressed and deformed by a pressing force when the sealing member 24 is assembled into the cylindrical mold 13 in order to further obtain a sealing effect.

The size of the seal member 24 is set so that when the seal member 24 is mounted in the groove 27, a part of the seal member 24 protrudes outside the outer peripheral surface of the core 21 from the groove 27. .

The material of the seal member 24 is polyethylene,
It is possible to use resin materials such as polypropylene, polyamide, polycarbonate, and polyimide, and resin materials with conductivity added to those resins as needed, and metal materials such as aluminum, brass, and iron. Needless to say, a material that does not melt or deform when heated and hardened is selected. In particular, polyvinyl chloride, silicone, polyurethane, E, and the like are materials that are compressed and deformed by the assembling force of the core body holding member 14 and have an effect of preventing resin leakage.
Elastic resin materials such as PDM and NBR, as well as resin materials, copper, brass,
It is also possible to use a metal material such as phosphor bronze. In addition, if mass-produced O-rings or the like are used, the O-rings can be obtained at low cost, and the cost can be further reduced.

The sealing member 24 is formed by injection molding, extrusion molding,
It is manufactured by punching, forging, casting or the like in the form of a sheet or a plate, and has a shape having an inner diameter in close contact with the seal member groove 27, and an outer diameter of 10% to 90% of the thickness of the seal member from the outer peripheral surface of the core body 21. It is preferable that the size protrudes by%. The thickness is preferably 0.1 mm to 5 mm and the length is preferably 0.1 mm to 20 mm, and the thickness is 1 mm to 3 mm and the length is 1 mm to 5 mm.
mm is more preferable. The cross-sectional shape can be circular, semicircular, elliptical, square, and the like.

The depth of the groove 27 for attaching the seal member 24 to the core body 21 is 10% to 90% of the thickness of the seal member 24.
Is preferred.

Next, a method of manufacturing the resin roller of the present invention using the above-described core 21 and the structure around the core will be described.

A polysiloxane-based curing agent and a conductivity-imparting material (carbon black) are blended with the terminal allylated polyoxypropylene-based polymer.
The roller outer diameter is φ16 mm and the length of the resin molded body 12 is 2
When a 50 mm roller is molded, the viscosity of the compounded injected resin depends on the number of mixed parts of the conductivity-imparting material.
Injection pressure at injection is 0.5MPa ~ 4M
Pa is preferred.

When the thickness of the resin molded body 12 is 4 mm, the diameter of the resin injection port of the mold is preferably 1 mm to 2 mm. In addition, it is desirable that the direction of the mold at the time of injection is set such that the longitudinal direction of the mold is vertical and the injection is performed from the lower part of the mold.

The heating of the mold can be performed by any conventionally known method. Specifically, for example, a method of heating in a heating furnace provided with a heating fan, a method of arranging and heating an electric heater around a mold, or a method of arranging an induction heating coil around the mold and heating. There is a way.

As the temperature of the mold, any temperature at which the thermosetting resin can be injected and cured by heating can be selected. For example, about 20 ° C. to 80 ° C. is preferable. Further, the heating temperature of the resin depends on the amount of the curing retarder to be mixed with the resin, but is preferably about 80C to 200C.

As a molding resin material usable in the molding method of the present invention, a thermosetting resin is used. For example, silicone, polyurethane, acrylonitrile / butadiene copolymer (NBR), ethylene / propylene / diene / methylene copolymer (EPDM) and the like can be used.

The thermosetting resin may contain other various additives as required. For example, if a resistance control agent such as carbon is added, the electric resistance of the roller can be controlled.

As the thermosetting resin material, a curable composition described below can also be used. Since the molding resin composed of the reaction cured product of the curable composition has a particularly flexible structure,
Even if the thickness is reduced, the elastic effect is sufficiently exhibited. When oxyalkylene units are contained in the molecule, they have low viscosity before curing and are easy to handle.When they contain saturated hydrocarbon units, they have low water absorption and change in volume and change in roller resistance even in a high humidity environment. Is preferred in that there is little

That is, (A) the thermosetting resin material has at least one alkenyl group in the molecule, and the repeating unit constituting the main chain mainly comprises an oxyalkylene unit or a saturated hydrocarbon unit. It is preferable to use a cured composition containing, as main components, a polymer, (B) a curing agent having at least two hydrosilyl groups in a molecule, (C) a hydrosilylation catalyst, and (D) a conductivity-imparting agent.

Materials for adjusting the thermosetting reaction, such as a curing agent, a curing accelerator, and a curing retarder, are added to the thermosetting resin as needed. If necessary, an organic or inorganic filler can be added. Furthermore, various organic or inorganic pigments, thickeners, release agents, and the like can be added as necessary.

[0068]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, non-limiting embodiments of the present invention will be described.

Example 1 Using the mold 1 shown in FIG. 3, a resin roller having a roller outer diameter of 16 mm and a length of the resin molded body 12 of 250 mm was formed as follows.

The outer diameter of the core 21 is 6 mm and the sealing member 2
6, a silicon tube having an inner diameter of 4 mm, an outer diameter of 6 mm, and a length of 5 mm is press-fitted into the core body 21 and mounted, and the mounting position is such that the sealing member 26 is axially moved by the assembling force of the core body holding member 14. It was designed to be compressed by 0.5 mm.

The gap between the inner diameter of the concave portion 17 of the core holding member 14 and the end 21a of the core 21 was 15 μm.

The thermosetting resin material used was a compounded resin shown in Table 1 below and had a viscosity of 600 poise.

The compounded resin material was placed in a liquid resin injection / injection machine at an injection pressure of 4 MPa, and the longitudinal direction of the mold was vertically set in a mold having a diameter of 1.5 mm at the resin injection port 16 of the mold. Injected from the bottom of the mold.

The heating of the mold is performed by placing the mold in a heating furnace provided with a heating fan and heating the same. The atmosphere temperature in the heating furnace is set to 140 ° C., and after heating for 20 minutes, the mold is heated. From the mold to obtain a molded product.

As a result, at the shaft end of the obtained roller,
No resin leakage occurred.

[0076]

Table 1 Each component of the curable composition: parts by weight (A) Allyl-terminated oxypropylene-based polymer: 100 (number average molecular weight (Mn) 8000 (B) Polysiloxane-based curing agent: 6.6 (per 100 g) (SiH value: 0.36 mol) (C) 10% isopropyl alcohol solution of chloroplatinic acid ... 0.06 (D) Carbon black ... 7 (Product name "3030B" manufactured by Mitsubishi Chemical Corporation)

[0077]

According to the present invention, even when a core having the same outer diameter at the center (resin molded body portion) of the core and the end of the core is used, the resin is formed on the shaft of the resin roller. Good products can be stably obtained at low cost without causing leakage.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a molding die of a resin roller according to one embodiment of the present invention.

FIG. 2 is a sectional view showing a molding die of a resin roller according to another embodiment of the present invention.

FIG. 3 is a sectional view showing a molding die of a resin roller according to still another embodiment of the present invention.

FIG. 4 is a sectional view showing a relationship between a molding die shown in FIG. 1 and a mounting position of a seal member.

FIG. 5 is a cross-sectional view showing a molding die of a resin roller according to still another embodiment of the present invention.

FIG. 6 is a perspective view of a general resin roller.

FIG. 7 is a sectional view showing a core body and a resin roller used in the present invention.

FIG. 8 is a cross-sectional view showing a state at the time of injecting a resin in a core and a molding die according to a conventional technique.

FIG. 9 is a cross-sectional view showing a state in which a resin is injected into another conventional core and a molding die.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molding die 10 Roller 12 Resin molded body 13 Cylindrical mold 14 Core holding member 15 Roller forming space 16 Injection port 18 Nozzle 19 Nozzle touch part 21 Core 22 E-ring 23 Groove 24 Seal member 25 Cylindrical member 26 Cylindrical member Seal member 27 Seal member mounting groove 30 Resin leakage

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) G03G 15/08 501 G03G 15/08 501D 4F206 15/16 15/16 // B29K 101: 10 B29L 31:06 (72) Inventor Yoshiji Sezaki 1-12-32 Akasaka, Minato-ku, Tokyo Kanabuchi Chemical Industry Co., Ltd. HA47 4F204 AA36 AD03 AD15 AH04 AM03 EA03 EB01 EB12 EF05 EF27 EF49 EK13 EK17 EK24 EW06 EW15 4F206 AA32 AA33 AA36 AB18 AD03 AD15 AH04 AM03 JA07 JB12 JF05 JQ81

Claims (7)

[Claims] A core is disposed in a molding die having a cylindrical mold and core holding members attached to both ends of the cylindrical mold, and both ends of the core are attached to the mold. A resin roller manufactured by injecting and curing a molding resin into a mold held by a core holding member, wherein the resin roller has a core having the same outer diameter over its entire length; A cylindrical resin molded body provided at the center of the
In the vicinity of both ends of the molded body, a seal member is provided around the core body, and the seal member is formed so that the core body is in contact with the end surface of the core body holding member on the molding space side. A resin roller, which is disposed in a mold. 2. A groove for attaching an E-ring to the core is provided, and when the E-ring is attached to the groove and the core is disposed in a mold, the E-ring and the core holding are provided. The resin roller according to claim 1, wherein the seal member is attached to the core so as to be in contact with an end surface of the member. 3. The sealing member is attached to the core body so that when the core body is disposed in a mold, the cylindrical member and the core body holding member come into contact with the end surfaces of the core member and the core body holding member, respectively. The resin roller according to claim 1, wherein is attached to a core body. 4. The method according to claim 1, wherein the seal member is attached to the core body, and when the core body is disposed in a mold, an end face of the seal member contacts an end face of the core body holding member. The resin roller according to claim 1, wherein: 5. A groove for attaching a seal member to the core body is provided, and the seal member is provided in the groove so as to be in contact with an end face of the core body holding member when the core body is disposed in a mold. The resin roller according to claim 1, wherein the resin roller is provided. 6. A core body having the same outer diameter over the entire length,
A cylindrical resin molded body provided at a central portion of the core body, wherein a seal member is provided around the core body near both ends of the molded body, and the seal is provided. A resin roller whose end face is the same as or protrudes from the end face of the molded body. 7. A step of disposing core holding members at both ends of a cylindrical mold and holding a core with both core holding members; Injecting and curing a molding resin into a molding space formed between the cores to form a resin molding around the core body, comprising: A resin is provided around the core body, and the seal member is elastically contacted with an end surface of the core body holding member on the molding space side, and in this state, a molding resin is injected into the molding space. Roller manufacturing method.