JPH04135831A - Manufacture of roller - Google Patents

Abstract

PURPOSE:To manufacture a roller without creases and excellent in yield by cutting the end of a synthetic resin tube by means of the sliding of a first channel provided on a fitting face of a top force or a bottom force of a cylindrical mold and a second channel provided on an upper section or a lower section and at lease positioned partly in the first channel each other. CONSTITUTION:A core bar 6 is inserted into a synthetic resin tube 2, and a top force 7 and a bottom force 8 are fixed by clamping a cylindrical mold 4 and the synthetic resin tube 2, and the core bar 5 is fixed in the cylindrical mold 4 concentrically. After that, liquid rubber is fed between the synthetic resin tube 2 and the core bar 6 from a liquid rubber feeding body. The liquid rubber is disposed in a constant temperature bath under the desired temperature to vulcanize an elastic body layer 9 and fusion bond the synthetic resin tube 2 with the elastic body layer 9. After that, the top force 7 is released out of the cylindrical mold 4 taken out of the constant temperature bath. At that time, a channel 10 formed in the cylindrical mold 4 and a second channel 11 formed in the top force 7 are slided together, and when the second channel 11 passes through the edge of the first channel 10, the synthetic resin tube 2 is cut at that position. As the end of synthetic resin tube 2 is separated from a roller section, the section fusion bonded with the elastic body layer 9 is not pulled by the top force 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a roller used in a toner fixing section of an electronic copying machine or the like.

[Prior Art] Rollers such as heating rollers and pressure rollers that are conventionally used in the fixing section of electronic copying machines to fix toner on paper passing through the machine are as follows:
It is required to have appropriate stiffness and elasticity, good releasability from toner, and durability. Therefore, in order to obtain a smooth surface, we created a multilayered low bow using complex processes such as providing an elastic layer on the core metal, laminating a thin film layer with good mold release properties on the surface after grinding, and performing the grinding process. was manufacturing. On the other hand, in the case of rollers for popular machines, in order to reduce costs, condensation reaction room-temperature curing silicone rubber (RT
Non-grinding rollers are also frequently used in which liquid rubber such as V) or addition-reactive silicone rubber (LTV) is injected into a mold and cured to produce an interface-like surface from the beginning.

Problem 1 to be Solved by the Invention In manufacturing a non-grinding roller, a tube with good release properties from toner is attached to the inner wall of a cylindrical mold, and a core metal is placed inside the tube coaxially with the cylindrical mold. Insert the upper and lower molds into the cylindrical mold and fix the core metal.

After that, after sucking the air between the tube and the cylindrical mold using a vacuum pump, etc., liquid rubber such as silicone rubber is injected between the core metal and the tube, or the rubber-coated core shaft is inserted into the cylindrical mold with the tube attached. After fitting the upper and lower molds into the cylindrical mold, the rubber is heated in a constant temperature bath for a predetermined period of time to vulcanize the rubber and fuse the tube. - A non-grinding cola was produced by laminating an Ait type layer with good mold release properties, which does not require an increase in the number of steps.

When producing these non-grinding rollers, the mold is placed in a constant temperature bath for a predetermined period of time, and after the rubber is vulcanized and the synthetic resin tube is fused, the roller is removed from the mold.

To remove the roller from the mold, first either the upper mold or the lower mold is removed from the cylindrical mold, or
At this time, the synthetic resin tube is pulled and the ends are cut as appropriate.

However, the synthetic resin tube was not cut properly and force was applied to the roller section, often resulting in creases in the synthetic resin tube fused to the roller section. As a result, the production yield of rollers has been reduced.

The present invention has been made to solve the above-mentioned drawbacks, and when the roller is removed from the mold after vulcanization, when the end of the tube is cut, no force is applied to the roller, and the end of the tube is removed. It is an object of the present invention to provide a method for manufacturing a roller that can be cut properly so that wrinkles do not occur in the roller part and that the yield is high.

1. Means for Solving the Problem] In order to achieve the above object, the method for manufacturing a roller of the present invention includes inserting a roller coaxially into a cylindrical mold having a synthetic resin tube attached to the inner wall, and fixing the roller. An upper mold and a lower mold that sandwich the ends of the synthetic resin tube with the cylindrical mold are fitted into the cylindrical mold, and heated to place the synthetic resin tube on the surface of the roller. After fusion,
When removing the upper mold or the lower mold from the cylindrical mold, a first groove provided in a fitting surface of the cylindrical mold with the upper mold or the lower mold; When fitted into a cylindrical mold, the second groove provided in the upper mold or the lower mold, which is at least partially located in the position of the first groove, slides, and the synthetic resin Cut the end of the tube.

[Operation] When the upper or lower mold is fitted into the cylindrical mold, a first groove is provided on the surface of the cylindrical mold to which the upper or lower mold is fitted.

On the other hand, in the upper or lower mold, which is fitted by sandwiching the end of the synthetic resin tube to the cylindrical mold, a second mold is inserted so that one part is located in the first groove position in the fitted state. Provide a groove.

Then, when removing the roller from the mold after heating and fusing the synthetic resin tube to the surface of the roller, when removing the upper or lower mold from the cylindrical mold, the first groove and the second groove will slide. to ensure that the end of the synthetic resin tube is cut. Therefore, the synthetic resin tube fused to the roller surface is not stretched and wrinkles do not occur in the roller portion.

[Example 1] An example to which the method of manufacturing a roller of the present invention is applied will be described with reference to the drawings.

The roller manufacturing apparatus 1 shown in FIG. 1 includes a cylindrical mold 4 to which a synthetic resin tube 2 is attached to the inner wall and the end portion 3 of the synthetic resin tube 2 is folded back.

At both ends 5 of the cylindrical mold 4, there are an upper mold 7 and a lower mold 8 for fixing a core metal 6 constituting a roller coaxially with the cylindrical mold 4.
The ends 3 of the synthetic resin tube 2 are sandwiched and fitted together.

The upper mold 7 or the lower mold 8 is provided with a liquid rubber inlet (not shown) for forming an elastic layer 9 between the core metal 6 and the synthetic resin tube 2. The liquid rubber inlet is connected to a liquid rubber supply body (not shown), and a predetermined amount of liquid rubber is supplied so as to be sufficient to form the elastic layer 9.

As shown in FIG. 2, a first groove 10 is provided in the fitting surface of the end portion 5 of the cylindrical mold 4 of the roller manufacturing apparatus 1 with the upper mold 7, as shown in FIG. A second groove 11 is provided on the fitting surface of the upper mold 7 with the cylindrical mold 4 so as to partially face the first groove 10 .

The sizes of the first groove 10 and the second groove 11 are appropriately selected depending on the thickness of the synthetic resin tube 1. For example, if the synthetic resin tube has a thickness of 50 μm, the first width a of 10 is 0.
The depth b is 5 mm or more, and the depth b is 0.2 mm or more. Similarly to the size of the first groove 10, the second groove 11 may have a width C of 0.5 mm or more and a depth d of 0.2 mm or more, and the cylindrical mold 4
When the upper mold 7 is fitted to the
It is provided so as to be located at the position of the groove 10. 1st full 10
The overlapping margin e of the second groove 11 is preferably 0.1 mm or more.

A method of manufacturing a roller using the roller manufacturing apparatus having such a configuration will be described.

The synthetic resin tube 2 is inserted into the cylindrical mold 4, and the end portion 3 of the synthetic resin tube 2 is folded back and attached to the outer wall of the cylindrical mold 4. The synthetic resin tube 2 is preferably made of a fluororesin such as perfluoroalkoxy resin (PFA), which has good releasability from toner, and has a thickness of about 10 to 200 μm. Then, the core metal 6 is inserted into the synthetic resin tube 2, and the upper mold 7
The lower mold 8 clamps and fixes the cylindrical mold 4 and the synthetic resin tube 2, and fixes the core metal 5 coaxially with the cylindrical mold 4. Thereafter, a desired amount of liquid rubber, such as silicone rubber, is supplied between the synthetic resin tube 2 and the core metal 6 from the liquid rubber supply body. Then, the elastic layer 9 is placed in a constant temperature bath at a desired temperature and for a desired period of time, and the elastic layer 9 is vulcanized, and the synthetic resin tube 2 is fused to the elastic layer 9. Thereafter, the upper mold 7 is removed from the cylindrical mold 4 taken out from the constant temperature bath. At this time, the first groove 10 formed in the cylindrical mold 4 and the second groove 11 formed in the upper mold 7 slide, and the second groove 11 passes through the edge of the first groove 10. At this time, the synthetic resin tube 2 is cut at this position. Therefore, the ends of the synthetic resin tube 2 are separated from the roller portion, so that the portion fused to the elastic layer 9 is not pulled by the upper mold 7. Then, the core metal 6 is pulled out from the cylindrical mold 4 into the lower mold 8 while still being fitted.
Thereafter, the lower mold 8 is removed and the excess end of the synthetic resin tube 2 is cut and removed.

The above description is an explanation of one embodiment of the present invention, and the present invention is not limited thereto.In addition to providing grooves in the upper mold and the cylindrical mold, the fitting of the lower mold and the cylindrical mold is also possible. Grooves may also be provided on the surface.

In addition, silicone rubber that forms an elastic layer between the synthetic resin tube and the core metal is injected, vulcanized, and fused, or the core metal is coated with rubber that forms an elastic layer beforehand and the synthetic resin tube is attached. It may also be inserted into a cylindrical mold.

[Specific example] A 50 μm thick PFA tube is attached to a cylindrical mold,
Rubber outer diameter 40mm, thickness 5mm between PFA tube and core metal
, rubber hardness 40° (J I 5-A) silicone rubber was supplied, and vulcanization was performed in a conventional manner.

The overlap between the grooves provided in the cylindrical mold and the upper mold is 0.2m.
It was set as m. When the roller was removed from the mold, there were no wrinkles at all on the roller part, whereas conventionally there were 40% wrinkles.

[Effects of the Invention] As is clear from the above description, according to the method for manufacturing a roller of the present invention, a groove provided in a cylindrical mold and an upper or lower mold fitted to the end of the mold is slid; Since the ends of the sandwiched synthetic resin tube are cut, the synthetic resin tube fused to the roller portion is not pulled when the roller is removed from the mold after forming. Therefore, it is possible to perform manufacturing with a high yield without causing wrinkles in the roller portion.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of a roller manufacturing apparatus to which the roller manufacturing method of the present invention is applied, and FIG. 2 is a diagram showing essential parts of the embodiment shown in FIG. 1. 1...Roller manufacturing device 2...Synthetic resin tube 3...Part of the synthetic resin tube 4...
Cylindrical mold 6...Core metal (roller) 7...Upper mold 8...Lower mold 10...First groove 11...No. Groove 2

Claims (1)

[Claims] An upper mold and a lower mold in which a roller is coaxially inserted into a cylindrical mold with a synthetic resin tube attached to the inner wall, the roller is fixed, and the end of the synthetic resin tube is sandwiched between the cylindrical mold and the cylindrical mold. After fitting a mold into the cylindrical mold and heating to fuse the synthetic resin tube to the roller surface, when removing the upper mold or the lower mold from the cylindrical mold, a first groove provided on a fitting surface of the cylindrical mold with the upper mold or the lower mold; and at least a portion of the cylindrical mold at the position of the first groove when the cylindrical mold is fitted into the cylindrical mold. A method for manufacturing a roller, characterized in that a second groove provided in the upper mold or the lower mold, in which the mold is located, slides to cut the end of the synthetic resin tube.