JP4657460B2 - Roller manufacturing method and stopper member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing a roller used in, for example, a printer and a stopper member used when forming a roll member.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a roller used for a developer conveying roller of a copying machine or a printer is provided with a cylindrical roll member on the outer periphery of a metal or resin shaft. Examples of the material constituting the roll member include thermoplastic resins such as polyethylene, polyvinyl chloride, and polystyrene, and thermosetting resins such as polyurethane, epoxy resin, and silicone resin. Among these, polyurethane resins Is often used.
As a manufacturing method of the roller, for example, after producing a prismatic roll member provided with a cylindrical hollow portion in the center, press-fit the shaft into the hollow portion of the roll member and fixed with an adhesive or the like, There is a method in which the outer peripheral portion of the roll member is ground and formed into a cylindrical shape.
Further, many methods are employed in which a shaft is embedded in the concave portion of a mold member having a concave portion which is a raw material injection portion, and the shaft and the roll member are integrally formed. This is because, for example, a plate-like stopper member made of a heat-resistant resin such as polypropylene is inserted into both end sides of the shaft, and a liquid roll member material is poured into the gap of the stopper member to be solidified. A columnar roll member and a shaft are integrally formed. Thereafter, the stopper member is extracted from the shaft, the outer peripheral portion of the roll member is ground, and the roll member is formed into a columnar shape.
[0003]
[Problems to be solved by the invention]
By the way, when a gap is generated between the shaft and the stopper member when the stopper member is attached to the shaft, the poured raw material liquid leaks from the gap to the outside of the stopper member and adheres to the protruding portion of the shaft. Resulting in. Therefore, before performing the grinding, a pre-grinding process for removing material adhering to the protruding portion of the shaft by grinding or the like is necessary.
In order to reduce the amount of adhesion, it is necessary to make the diameter of the through hole of the stopper member as close as possible to the diameter of the shaft, but the diameter of the through hole is made small and the stopper member is set tightly on the shaft. In this case, since a great amount of labor is required for attaching and removing the stopper member, there is a problem that the work efficiency is lowered, and there is a limit to reducing the diameter of the through hole.
[0004]
The present invention has been made in view of the conventional problems, and facilitates the attaching operation and the extracting operation of the stopper member, and eliminates the adhering matter without causing the liquid raw material to adhere to the shaft protruding portion. The object is to omit the roller manufacturing process.
[0005]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a roller manufacturing method in which a shaft penetrating into a plate-like stopper member whose opposite ends face each other is disposed in a mold member, and a liquid raw material is poured between the stopper members. When the roll member is formed, the stopper member is made of a foam that can be ground simultaneously with the roll member.
[0006]
The roller manufacturing method according to claim 2 is characterized in that the roll member is ground without removing the stopper member from the shaft.
[0008]
The roller manufacturing method according to claim 3 is characterized in that both the stopper member and the roll member are made of a thermosetting resin.
[0009]
According to a fourth aspect of the present invention, there is provided a roller manufacturing method, wherein a release layer is provided on the mutually opposing surfaces of the respective stopper members.
[0010]
The stopper member according to claim 5 is a stopper member that is attached to both ends of the shaft embedded in the raw material injection portion of the mold member that forms the roll member, and is composed of a foam that can be ground simultaneously with the roll member. It is.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIGS. 1A to 1C are views for explaining a roller manufacturing method according to the first embodiment. In each figure, reference numeral 10 denotes a mold member for injecting a liquid raw material 20L made of urethane. The mold member 10 is provided with a plurality of quadrangular columnar recesses 10S in parallel. 11 is a columnar or cylindrical metal shaft, 12 is attached to both ends of the shaft 11, and is a plate-like stopper member that functions as a stopper when casting the liquid roll member 20L. It is a roll member obtained by solidifying the raw material 20L.
The stopper member 12 is a square plate-like member having the same cross-sectional shape as the concave portion 10S provided with a through hole 12P having a diameter substantially the same as the outer diameter of the shaft 11 in the center. The stopper member 12 was made of urethane, which is the same thermosetting resin as the roll member 20.
[0012]
Next, a method for manufacturing the roller will be described.
First, as shown in FIG. 1B, the end portions of the shaft 11 are inserted into the respective through holes 12 </ b> P and 12 </ b> P of the two stopper members 12 and 12, and the stopper members 12 and 12 are attached to the shaft 11. Next, the shaft 11 to which the stopper member 12 is attached is disposed in the recess 10 </ b> S of the mold member 10. Since the sectional shape of the stopper member 12 is the same as the sectional shape of the recess 10S, the recess 10S is divided into three spaces separated from each other by the stopper members 12 and 12. Thereafter, as shown in FIG. 1 (c), the liquid material 20L made of urethane is poured into the gap between the two stopper members 12, 12 of the recess 10S, solidified, and demolded. And the roll member 20 are integrally manufactured.
In Embodiment 1, since both the roll member 20 and the stopper member 12 are made of urethane, the roll member 20 and the stopper members 12 and 12 are simultaneously removed without removing the stopper members 12 and 12 after demolding. After grinding and forming into a cylindrical shape, the stopper members 12, 12 are removed from the shaft 11 to obtain a roller.
In addition, since the stopper member 12 is made of a foam (here, urethane) having a large number of pores therein, even if a slight gap is generated between the shaft 11 and the stopper member 12 in the solidification step, the stopper member 12 is liquid. 20L (urethane liquid) is absorbed by the stopper member 12 and does not leak outside . Therefore, Ki out to prevent the urethane is attached to the protruding portion of the shaft 11 can be made good quality foam roller 1.
[0013]
As described above, according to the first embodiment, since the stopper member 12 is made of urethane of the same material as the roll member 20, even if a gap is generated between the shaft 11 and the stopper member 12, the liquid raw material 20L Since the shaft protrusion does not leak, the through hole 12P can be set slightly wider. Therefore, the attaching / detaching work of the stopper member 12 becomes easy, the working efficiency is improved, and the pre-grinding step can be omitted, so that the working time can be greatly shortened.
Moreover, since the roll member 20 can be immediately ground and molded without removing the stopper members 12 and 12 after demolding, the working efficiency is improved.
[0014]
In the first embodiment, the roller is described as being for a printer. However, the present invention is not limited to this, and the present invention can also be applied to a foam roller of another apparatus. Moreover, in the said example, although the roll member 20 and the stopper member 12 were comprised from the urethane which is a thermosetting resin, you may use other materials, such as other thermosetting resins, such as polyethylene, or a silicone resin.
The stopper member 12 may be made of another material such as silicone resin or solid rubber as long as it can be ground simultaneously with the roll member 20.
[0015]
Embodiment 2. FIG.
By the way, when the roll member 20 is ground, the shaft 11 needs to be held by the rotating chuck of the grinding device. However, when the protruding portion of the shaft 11 is as short as about 5 to 10 mm, for example, the stopper member 12 is attached. In this state, it is difficult to grip the shaft 11, so it is necessary to perform grinding after removing the stopper member 12 from the shaft 11.
Therefore, in the second embodiment, a release layer is formed by sticking a release paper made of, for example, a film or the like on the surface of the stopper member 12 that is in contact with the raw material.
Thereby, even when the protrusion part of the shaft 11 is short and it is necessary to remove the stopper member 12, the stopper member 12 can be easily removed from the shaft 11.
[0016]
In order to stick the release paper to the stopper member 12, after sticking the release paper to the urethane block so that the glossy surface becomes the front, the urethane block is processed into the shape of the stopper member. Also good.
Further, instead of the release paper, a release agent may be formed by applying or spraying a release agent on the surface of the stopper member 12 in contact with the raw material.
[0017]
【The invention's effect】
As described above, according to the present invention, the stopper member attached to both ends of the shaft embedded in the raw material injection portion of the mold member forming the roll member can be foamed such as urethane that can be ground simultaneously with the roll member. Since the roll member can be ground without removing the stopper member from the shaft, the manufacturing process can be simplified.
Further, since the stopper member is foam, even without setting a tight stopper member to the shaft, it is possible to prevent the liquid material from flowing into the shaft projection. Therefore, the adhesion of the raw material to the shaft protrusion can be eliminated and the pre-grinding step can be omitted, so that the working time can be greatly shortened.
Also, by providing release layers on the mutually opposing surfaces of each stopper member, the protruding portion of the shaft is short, and even when it is necessary to remove the stopper member during grinding, the stopper member can be easily removed from the shaft 11. Can do.
[Brief description of the drawings]
FIG. 1 is a diagram showing a method for manufacturing a foam roller according to a first embodiment.
[Explanation of symbols]
10 mold member, 10S mold member recess, 11 shaft, 12 stopper member, 12P through hole, 20 roll member, 20L liquid raw material.

Claims (5)

In the method of manufacturing a roller, in which a shaft penetrating a plate-like stopper member whose both ends are opposed to each other is disposed in a mold member, and a liquid material is poured between the stopper members to form a roll member, the liquid material A method for producing a roller, characterized in that the roll member is formed using a stopper member formed of a foam that can be ground simultaneously with a roll member obtained by solidifying the roll. The roller manufacturing method according to claim 1, wherein the roll member is ground without removing the stopper member from the shaft . And the stopper member and the roller member, both the manufacturing method of the roller according to claim 1, characterized by being configured of a thermosetting resin.   The method for manufacturing a roller according to claim 1, wherein a release layer is provided on surfaces of the stopper members facing each other. A stopper member attached to both ends of a shaft embedded in a raw material injection portion of a mold member forming a roll member, wherein the stopper member is formed of a foam that can be ground simultaneously with the roll member.

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