JPH0516266A - Production device for roller - Google Patents

Abstract

PURPOSE:To handle a sleeve properly at all times, and to improve yield by forming recessed sections, into which a cylindrical mold is inserted, to both left and right molds while folded end sections in the external wall of the cylindrical mold in the sleeve are held by the external wall of the cylindrical mold and the internalwalls of the recessed sections of the left and right molds. CONSTITUTION:When a roller is manufactured by using a production device S, a sleeve 2 is attached on the innerwall of a cylindrical mold 8 first. On the other hand, caps 10 are fitted at both end sections of a mandrel 9, and inserted into the cylindrical mold 8. Both end sections of the cylindrical mold 8 are inserted into the recessed sections 13 of both left and right molds 11, 12. A spring 20 is latched to projections 19, and both left and right molds 11, 12 are clamped mutually. The injection port 16 of a liquefied rubber supply system is fitted into the rubber filler hole 17 of the right mold 12, and the mandrel 9 is pushed to the left together with the cap 10. A liquefied rubber 15 is injected between the mandrel 9 and the sleeve 2 from a clearance between the right mold 12 and the cap 10. The liquefied rubber 15 is vulcanized and cured, and mold-released, thus acquiring the roller.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a roller used for toner fixing and developing in an electronic copying machine or the like.

[0002]

2. Description of the Related Art In recent years, a heat fixing portion of an electronic copying machine or a laser printer and a roller used for development have become stable in response to demands for higher speed, higher quality and higher image quality of the electronic copying machine or laser printer. Paper passing has become a problem. As a roller that meets these requirements, a multi-layered roller having a layer having a good releasability on the surface has come to be used. In order to manufacture a roller having a multi-layer structure, a core metal was vulcanized and adhered with silicone rubber to form an elastic roller, the surface was ground, and latex or the like was applied to the outermost layer through a primer and baked. However, the number of processes is increased, and foreign substances attached or mixed in during the manufacturing process are often carbonized in the firing process, leading to protrusions or depressions on the roller surface or pinholes in the surface layer film.

Therefore, there is also a method in which a heat-shrinkable tube is used as the outermost layer and an elastic roller formed by providing a core metal with silicone rubber is inserted into the tube and heated to cover the elastic roller with the tube. However, there is nothing satisfactory as a tube having a high shrinkage factor due to heat, and therefore the elastic roller is inserted into a tube having a slightly larger diameter, which makes the work difficult. In addition, if a large-diameter one is used to facilitate the work, wrinkles are generated on the surface or the adhesive force between the tube and the elastic roller is weakened.

[0004]

For this reason, a sleeve having a diameter slightly smaller than this inner diameter is attached to the inside of the cylindrical mold according to the present applicant, and a metal core is erected at the center of the gap between the metal core and the sleeve. After injecting liquid rubber to expand the sleeve,
A method of manufacturing the mold by firing and vulcanization (Japanese Patent Laid-Open No. 1-22)
19781, JP-A-1-278315, JP-A-1-
278316) is known. Further, when liquid rubber is injected between a core metal and a sleeve having an inner diameter smaller than the inner diameter of a cylindrical mold, a liquid rubber which prevents the liquid rubber from flowing into a gap between the sleeve and the cylindrical mold has been developed. Figure 2
Attach the sleeve 2 to the inner wall of the cylindrical mold 1 as shown in
The ends of the sleeve 2 folded back to the outer wall of the cylindrical mold 1 are fixed by the stoppers 3 such as O-rings. Then, the left mold 5 and the right mold 6 into which the left and right ends of the cored bar 4 coaxially installed in the center of the cylindrical mold 1 are fitted are inserted into the cylindrical mold 1 and set. After that, liquid rubber was injected between the sleeve and the cored bar 4 from the liquid rubber injection port 7 provided in the right mold 6, and then the mold was left in a constant temperature bath to be vulcanized and cured to manufacture a roller. ..

However, when such a device is used, when the left mold 5 and the right mold 6 are inserted and fitted into the cylindrical mold 1 when setting the mold, the end of the sleeve 2 is left mold. 5
Also, the sleeve was not smoothed by being pushed into the inside of the cylindrical mold 1 by the right mold 6, and wrinkles were generated after vulcanization. Further, when the product is taken out from the post-vulcanization device, the end of the sleeve 2 is pulled when the left mold 5 and the right mold 6 are removed from the cylindrical mold 1, and the sleeve 2 adhered to the effective surface of the roller is stretched. It was sometimes lost.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and when setting the apparatus, the sleeve can be easily set in a proper state, and when the product is taken out from the apparatus after the roller is manufactured. It is also an object of the present invention to provide a roller manufacturing apparatus that can take out an extra force without loading the sleeve and can manufacture a good product with a high yield.

[0007]

In order to achieve the above object, a roller manufacturing apparatus of the present invention comprises a cylindrical metal mold that coaxially surrounds a core metal and a sleeve is attached to an inner wall thereof, and the core metal and In a roller manufacturing apparatus having left and right molds for sandwiching the cylindrical mold, a roller having a rubber injection port for supplying unvulcanized rubber between the core metal and the sleeve on one of the left and right molds,
Each of the left and right molds has a recess into which the cylindrical mold is inserted, and an end of the sleeve folded back to the outer wall of the cylindrical mold has an outer wall of the cylindrical mold and the recesses of the left and right molds. It is clamped and fixed by the inner wall.

[0008]

The left and right dies are formed with recesses into which the ends of the cylindrical dies are respectively inserted. When setting the mold for manufacturing the roller, the end of the sleeve attached to the inner wall of the cylindrical mold is folded back to the outer wall side of the cylindrical mold. Then, the ends of the cylindrical mold are inserted into the recesses of the left mold and the right mold, respectively.
At this time, the end of the sleeve is sandwiched between the outer wall of the cylindrical mold and the inner wall of the recess of the left or right mold, and is loaded toward the center along the outer wall. Therefore, since the sleeve attached to the inner wall surface of the cylindrical mold is loaded toward the end of the cylindrical mold, slack does not occur on the effective surface of the roller, so that the roller can be easily set. Also, when removing the roller from the mold after vulcanization, when removing the cylindrical mold from the recesses of the left and right molds,
The end folded back to the outer wall of the cylindrical mold is pulled, but no load is applied to the sleeve attached to the inner wall surface of the cylindrical mold,
It does not extend to the sleeve bonded to the roller effective surface. Therefore, the roller can be manufactured with high yield.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment to which the roller manufacturing apparatus of the present invention is applied will be described with reference to the drawings. The roller manufacturing apparatus S shown in FIG. 1 has a cylindrical mold 8 in which the sleeve 2 is attached to the inner wall surface.
Equipped with. The sleeve 2 is 95 to 98 of the inner diameter of the cylindrical mold 8.
% Of diameter, made of polyfluoroethylene, fluororesin, or the like, both ends of which are folded back on the outer wall surface of the cylindrical mold 8. Although not shown, a fixture for fixing the end of the folded sleeve 2 may be provided. Conical caps 10 are provided on the left and right ends of a cored bar 9 that is coaxially installed at the center of the cylindrical mold 8. further,
Left mold 1 for sandwiching a cylindrical mold 8 and a core metal 9 coaxially
1 and a right mold 12 are provided. Each of the left mold 11 and the right mold 12 has a recess 13 into which the end of the cylindrical mold 8 is inserted.
And a fitting portion 14 for fitting the cap 10 fitted to the cored bar 9 is further provided at the center of the recess 13. The right mold 12 is provided with a rubber injection port 17 that fits with an injection port 16 of unvulcanized liquid rubber 15 connected to an injection device (not shown). Further, the left mold 11 is provided with a pressure adjusting valve 18, which is opened when a pressure equal to or higher than a certain pressure is applied, and the internal pressure is adjusted. Pressure control valve 18
An air escape path (not shown) at the time of injecting liquid rubber may be formed therein. The left mold 11 and the right mold 12 have a protrusion 19 and are fixed to each other by a spring 20 hooked on the protrusion 19.

To manufacture a roller using the roller manufacturing apparatus having the above-described structure, the inner wall of the cylindrical mold 8 is attached with the sleeve 2 whose inner surface is etched, and the end of the sleeve 2 is attached. Fold back to the outer wall surface of the cylindrical mold 8. After that, a primer that promotes adhesion between the sleeve 2 and the liquid rubber is applied if necessary. On the other hand, the caps 10 are fitted to both ends of the cored bar 9 having the surface coated with the primer, and the cylindrical mold 8
To insert. Then, both ends of the cylindrical mold 8 are inserted into the recesses 13 of the left mold 11 and the right mold 12. At this time, both ends of the cored bar 9 are fitted to the fitting part 1 provided in the left mold 11 and the right mold 12.
4 is installed at a predetermined position and the both ends of the sleeve 2 folded back to the outer wall of the cylindrical mold 8 are connected to the cylindrical mold 8
And the inner wall of the recessed portion 13 is sandwiched between the outer wall and the inner wall of the recess 13, and the sleeves 2 attached to the inner wall of the cylindrical mold 8 are loaded in the central direction, and the sleeve 2 on the roller effective surface is loaded without any skill. Can be set without causing slack.

Then, a spring 20 is hooked on the protrusion 19 to fasten the left and right molds 11 and 12 to each other. Thereafter, when the injection port 16 of the liquid rubber supply system is fitted into the rubber injection port 17 of the right mold 12, the core metal 9 is pushed to the left in FIG. 1 together with the cap 10, and the space between the right mold 12 and the cap 10 is generated. The liquid rubber 15 is injected between the core metal 9 and the sleeve 2 through the gap. Liquid rubber 15 is a low viscosity type (100-200
0c. p. ), But is injected under pressure. At this time, while letting air between the core metal 9 and the sleeve 2 escape, the liquid rubber expands the diameter of the sleeve 2 and expands until it comes into close contact with the cylindrical mold 8. Further, when the liquid rubber 15 is injected, the pressure adjusting valve 18 is pressed, and when the force for pressing the pressure adjusting valve 18 reaches a certain pressure equal to or lower than the pressure received by the spring 20 on the left die 11, the pressure adjusting valve 18 Is opened and the liquid rubber 15 is ejected. At this point, it was found that the liquid rubber 15 had been filled between the core metal 9 and the sleeve 2, and the injection was stopped. Then, the apparatus S is left in a constant temperature bath at a predetermined temperature to cure and cure the liquid rubber 15.

When the roller is removed from the mold after vulcanization and curing, the cylindrical mold 8 is used.
Even when the left mold 11 and the right mold 12 are removed from both end portions, the load is applied only to the end portion folded back to the outer wall and does not extend to the sleeve 2 bonded to the effective surface of the roller. Therefore, it is easily demolded to obtain a roller.

[0013]

As is apparent from the above description, according to the roller manufacturing apparatus of the present invention, the left and right molds are provided with the recesses into which both ends of the cylindrical mold are inserted, so that the molds are set. At the time of demolding after vulcanization and at the time of vulcanization, the sleeve can always be properly handled, and the roller can be manufactured efficiently, easily, and with good yield without requiring special skill.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a roller manufacturing apparatus of the present invention.

FIG. 2 is a sectional view of a conventional roller manufacturing apparatus.

[Explanation of symbols]

 2 ・ ・ Sleeve 8 ・ ・ ・ ・ ・ ・ Cylindrical mold 9 ・ ・ ・ ・ Core metal 11 ・ ・ ・ Left mold 12 ・ ・ ・ Right mold 13 ・ ・ ・ ・・ Concave part 15 ・ ・ ・ Liquid rubber 17 ・ ・ ・ Rubber injection port S ・ ・ ・ ・ Roller manufacturing equipment

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Claims (1)

Claim: What is claimed is: 1. A cylindrical die which coaxially surrounds a core metal and has a sleeve attached to an inner wall thereof, and left and right dies that sandwich the core metal and the cylindrical die. In a roller manufacturing apparatus having a rubber injection port for supplying unvulcanized rubber between the core metal and the sleeve on one of the left and right molds, the left and right molds each include a recess into which the cylindrical mold is inserted, An apparatus for manufacturing a roller, wherein an end portion of the sleeve folded back to an outer wall of the cylindrical mold is clamped and fixed between an outer wall of the cylindrical mold and inner walls of the recesses of the left and right molds.