JPH0125962Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Technical field) This invention is based on Plain Paper Copy.
Copy) (PPC) This relates to a device that applies a release agent such as silicone oil to the fixing roll of a copying machine.

(Prior art and its problems) Basically, the fixing mechanism in a PPC copier is to pass the toner transferred onto the paper between a heated fixing roll and an elastic pressure roll such as a rubber roll while applying heat. It consists in crimping and baking. In such a mechanism, when a paper surface with toner attached passes between a heated fixing roll and an elastic pressure roll, the paper itself adheres to the roll and wraps around the roll, preventing complete printing. Problems such as toner transferred to the copy paper adheres to the fixing roll resulting in double copies of images (so-called offset phenomenon) and equipment failures occur. Therefore, various studies have been made in the past regarding this point, but the final method has been to apply a mold release agent to the fixing roll and the elastic roll for mold release.

However, it is very difficult to apply this mold release agent evenly and in the right amount to the roll, and if too much mold release agent is used, the paper surface becomes stained or discolored, and at the same time, the mold release agent is consumed rapidly. It takes time and effort to lubricate the roll, and too much mold release agent can solidify on the roll surface, causing unexpected breakdowns. Furthermore, if the amount of release agent is too small, the above-mentioned offset phenomenon will naturally occur, and the release properties of the roll surface will deteriorate, causing the paper to wrap around the roll. Incidentally, heat-resistant oil such as silicone oil is mainly used as a mold release agent.

For this reason, conventional release agent applicators with various structures have been developed and proposed, but these are not necessarily sufficient.

Therefore, the applicant of the present invention has devised a mold release agent applicator that is economical, ensures uniform application of mold release agent, consumes the minimum amount of mold release agent, and can be installed even in extremely narrow spaces. In addition, he invented and applied for a patent on the following product, which has a simple shape, is very inexpensive, and is disposable.

That is, as shown in FIGS. 1 and 2, in a fixing device that heats and fixes a toner image on copy paper 16 by passing between a fixing roll 14 and a pressure roll 15, both ends of the fixing roll 14 are heat-pressed or plugged, for example. The porous tube 7 of the polyethylene fluoride resin sealed by the polyethylene fluoride is brought into contact with the generatrix direction of the roll, and the mold release agent 6 is applied with the porous tube of the polytetrafluoroethylene resin. .

In the above case, since the porous tube 7 is soft, it is supported by the support 1 (FIG. 1) or 4 (FIG. 2). Further, in the porous tube, the pores other than the necessary openings from which the mold release agent is leached are filled with fluororubber or other material by, for example, coating. This is to make the discharge amount of the mold release agent a predetermined amount and uniform.

In FIGS. 1 and 2, 2 is a closed portion of the polytetrafluoroethylene resin porous tube, 3 is an open portion of the polytetrafluoroethylene resin porous tube, and 5 is an injection port.

However, even with the above, the following problems still exist. That is, it takes time and effort to close the pores of the porous tube other than the exudation part.

With this in mind, the present inventor invented a mold release agent application device that could do this more easily, and filed a patent application on the same day as the present application. That is, a divided support was used to form a lumen with an opening whose width was smaller than the maximum width of the lumen, the supports were combined, both ends were sealed, and a release agent was placed inside. A polytetrafluoroethylene resin porous tube is held in the inner cavity with the part that will become the release agent leaching part protruding from the opening of the porous tube, except for the part that will become the release agent leaching part that protrudes from the opening of the porous tube. This is a release agent applicator in which the pores in the part are closed by contact between the porous tube and the inner wall of the support body. Note that a mold release agent is injected or sealed into the porous tube beforehand or afterward.

As mentioned above, this device is extremely excellent as a mold release agent applicator, and if the mold release agent is applied in advance, it can be sealed and disposable. However, a drawback is that it takes time and effort to join together the divided parts of the support that supports the porous tube.

(Structure of the present invention) The present invention is a coating device developed to solve this problem, and in the release agent coating device of the patent application filed on the same date, A fused portion consisting of a concave and convex portion is provided, and the divided bodies can be fused together by frictional heat generated on the fitting vibration surface of the concave and convex portion.

The present invention will be explained in detail below with reference to the illustrative drawings.

Figures 3 and 4 show the mold release agent application device of the present invention,
20 indicates a porous tube of tetrafluoroethylene resin, which is obtained by extruding a tetrafluoroethylene resin mixture containing a liquid lubricant into a tube shape, stretching it, and then sintering it. No. 13560 and Japanese Patent Application No. 50-155226 (Japanese Patent Publication No. 58-15295) discloses fine mesh pores with uniformly controlled pore diameters, preferably having a pore diameter of 0.1 to 10 μm, and a porosity of 50 μm. ~85%, outer diameter 5~50mm, wall thickness 0.1~5
A polytetrafluoroethylene resin porous tube having a structure of 5 mm is used, for example, a pore front tube manufactured by Sumitomo Electric.

21 is a support which is divided into two parts. The division may be divided into upper and lower sections as shown in FIG. 3, or left and right sections as shown in FIG. The support 21 is a porous tube 20
The maximum width part B of the inner cavity 22 that encloses the mold is equal to the width A of the opening part 23 from which the release agent exuding part of the porous tube projects.
greater than (A<B).

As a result, the support closes the pores in the portion of the porous tube other than those protruding from the opening, and at the same time supports the porous tube.

In the present invention, a welded portion 25 consisting of a concave and convex portion is provided on the joining surface of the divided parts of the support body. Then, ultrasonic vibration is applied to this part (arrow), and the divided bodies are fused together by the frictional heat generated on the fitting vibration surface of this uneven part.

A specific example of the present invention is shown in detail in FIG. In Figure 5, a is a front view after assembly, Figure b is a side view after assembly, Figure c is a top view after assembly, Figure d is a rear view after assembly, Figures e, f, and g are A of Figure c. -A,C-
C, E-E cross-sectional view, Figures h, i, and j are B- of Figure c.
B, D-D, F-F cross-sectional views, Figure k is an enlarged view of Figure b, Figure l is a cross-sectional view of Figure K along E-A, Figure m is a Ro-Ro cross-sectional view of Figure l, Figure n is a figure Fig. a is an enlarged plan view of the end portion, and Fig. o is a sectional view taken along the line H--H of Fig. N. Note that the symbols in these figures correspond to the description of the present invention described above.

(Effects of the present invention) According to the present invention as described above, the porous tube is supported by the support and at the same time the pores in the portion of the porous tube other than the release agent leaching portion can be easily closed by the contact thereof. With this excellent mold release agent applicator, it is very easy to combine and fuse the divided parts of the support that supports the porous tube.

[Brief explanation of the drawing]

Figures 1 and 2 illustrate explanatory diagrams of the release agent coating device developed earlier by the present inventor, respectively; Figure 1 is a front view (Figure a) and cross-sectional view (Figure b), and Figure 2 It is a front view. Figures 3 and 4 illustrate explanatory diagrams of the mold release agent application device of the present invention, respectively, where Figure 3 is a cross-sectional view (Figure a) and a plan view (Figure b) of the device, and Figure 4 is a cross-sectional view. , is. FIGS. 5a to 5o illustrate specific examples of the present invention, respectively. DESCRIPTION OF SYMBOLS 1...Support, 2...Closed pore of tetrafluoroethylene resin porous tube, 3...Open pore of tetrafluoroethylene resin porous tube, 4...Support, 5...
Inlet, 6... Release agent, 7... Tetrafluoroethylene resin porous tube, 14... Fixing roll (heating roll), 15... Elastic pressure roll, 16... Copy paper, 19... Toner , 20...Tetrafluoroethylene resin porous tube, 21...Support, 22...Inner cavity, 23...Opening, 25...Fusion part.

Claims (1)

[Claims for Utility Model Registration] (1) Using a divided support that forms a lumen with an opening, the width A of which is smaller than the maximum width B of the lumen, and combining these supports. A porous tube of tetrafluoroethylene resin with both ends sealed is held in the inner cavity with the part that will become the release agent leaching part protruding from the opening, and the release agent leaching part is made to protrude from the opening of the porous tube. In a mold release agent applicator in which the pores in a portion other than the portion where the porous tube is brought into contact with the inner wall of the support are closed, the joint surface of the divided body of the support has an uneven portion. 1. A release agent application device for a copying machine, characterized in that a welding part is provided, and the divided bodies can be fused together by frictional heat generated on the fitting vibrating surfaces of the concave and convex parts. (2) A mold release agent application device for a copying machine as set forth in claim (1) of the utility model registration claim, in which a mold release agent is injected or sealed in advance into a porous tetrafluoroethylene tube. (3) A mold release agent application device for a copying machine as set forth in claim (1) of the utility model registration claim, in which a mold release agent is later injected or sealed into a porous tetrafluoroethylene tube.