JPS59200283A - Fixing device - Google Patents

Abstract

PURPOSE:To improve the durability of a heat fixing roll by using silicone rubber as the material of a coating layer of the heat roll and fixing a toner while applying silicone oil to the surface as an offset preventing agent. CONSTITUTION:The silicone rubber is coated on a primer after coating the primer to the surface of the core of an aluminium roll, and the roll is finished so that its diameter is 39.99mm.phi. This roll is set to a heat fixing device of a copying machine without being subjected to oil treatment at all, and the toner is fixed while coating silicone oil to the surface as the offset preventing agent.

Description

TECHNICAL FIELD The present invention relates to a toner image fixing device provided in an electrophotographic copying machine, a facsimile machine, etc., and more particularly to a heat fixing roller used in the above-mentioned fixing device. .

BACKGROUND OF THE INVENTION Conventionally, a contact heating fixing system has been widely adopted as a fixing device provided in a copying machine. This contact heat fixing method consists of a heating roll whose surface is coated with a heat-resistant release material and a heat-resistant and elastic pressure roll that are supported parallel to each other, and their circumferential surfaces are brought into circumscribed contact with each other at a constant pressure. , the toner image is heated and pressurized by passing a transfer paper with an elephant on it between them to fix the toner image.3 The coating layer of the heating roll in the above-mentioned force type includes silicone rubber, fluorine rubber, and fluorinated rubber. An elastic material such as silicone rubber and a non-elastic material such as Teflon (trade name) are used, and in some cases, an anti-offset liquid such as lincon oil is applied to the roll surface to fix the toner.Especially , heating rolls with elastic bodies on the surface have good image quality and have recently become widely used.However, when such elastic bodies, especially silicone rubber, are used, offset If you use it for a long time while applying the prevention liquid, the rubber will swell and the roll diameter will increase, or the diameter of the roll will differ in the areas where the paper does not pass, causing wrinkles or lines. There is a problem that speed changes occur.

To avoid this, conventional methods have been to form a coating layer of silicone rubber on the circumferential surface of a metal roll, immerse it in silicone oil to swell the coating layer in advance and stabilize the material, and then apply the coating layer to a predetermined position. A method for forming a heated roller that is ground to an outer diameter of Purpose The fixing device of the present invention was developed in view of the above-mentioned circumstances, and uses /recon rubber as a coating layer of the heating roll, and /fixes toner while applying recon oil to the surface as an anti-offset agent. The present invention aims to improve the i:tiJ durability of the heat fixing roller in an electrophotographic photographic machine equipped with a heat fixing system, without using a swollen silicone rubber with high cost. That is, an object of the present invention is to provide a heat fixing roller that can be molded and used without being immersed in oil.

Structure The present invention provides a heat roller fixing device that includes an anti-offset liquid coating device and includes both heating and pressure rollers made of elastic rubber rollers, in which the thickness of the elastic rubber covering the circumference of the heating roller is 0.4 mm or less. This is a fixing device equipped with a heating roller, characterized in that it is molded without being subjected to oil immersion and swelling treatment. That's right.

Example 1 After applying a primer to the surface of the core metal of an aluminum roller with a diameter of 39.4 mm, it was coated with KE530UHTV (Shin-Etsu Chemical)/Reconcom, and the diameter was 39.4 mm.
FT-4060 type [Ricoh Tomari ψ
The film was assembled into a heat fixing device of an electrophotographic copying machine (manufactured by J.D. Co., Ltd.), and after applying oil to its surface, 40,000 sheets of transfer paper were fixed. .

The roller of this example had no problems in comparison with the results of the conventional example which was subjected to the swelling treatment described below.

In the end, the thickness of the roller coating of the elastic body in the apparatus of this embodiment was 0.295+nm.

Example 2 ・
i In the case of Example 1, the rubber thickness (was 0.295 mm, but the same conditions as Example 1 were applied to the fixing roller with a 04wn thick g layer and a 0.5 mm thick coating layer. In the case of a roller with a coating layer of 0.5 thickness (30.00 mm), wrinkles were generated due to fixing of 0 sheets of transfer paper. When the roller surface was inspected, it was found that the rubber coating layer had swelled. There was some unevenness.

In the case of a roller coated with a coating layer of approximately 0.04 mm thickness, the coating layer swelled almost uniformly and there were no problems.

As described above, rollers with an elastic material coating layer can be used without causing any practical problems even if the roller is formed by immersing it in oil to swell the coating layer and then grinding its surface. I found out that it can be done 1. In this case, the thickness of the rubber is limited to 04 bars, and if it is thicker than that, problems may occur. 3. In addition, the roller circumferential surface The material and forming means of the bullet 1 raw material breaking layer may be other than those listed in the above-mentioned embodiments, such as R, T,
V, applying liquid/reconcomb to the roll surface by spraying and curing it to form a thin film layer, or H, T
, V can be applied 6. With the above method, it is possible to form the coating layer to a thickness of 1/100 mm, but if it is formed into a thin film, the effect of oil application will be uniform. While this tends to be preferable for the implementation of the present invention, if it is made extremely thin, there is a practical problem in terms of wear resistance, so the lower limit 1 of the thickness of the coating layer naturally has a limit.

As described above, even when used for molding without undergoing swelling treatment with oil, it shows the same performance as the examples of the present invention.1. The lower limit of the thickness of the layer to be laminated is in units of 1/LOOM, and the practical conditions are 'd4'.

Effects Here, to explain the conventional technology (a), refer to Japanese Patent Application Laid-Open No. 52-4681.9, aluminum core bar (]
After applying primer to the surface of M diameter 39.4mmφ), KE
-530UI (TV silicone rubber (Shin-Etsu Chemical) 0.
The roller was coated to a thickness of 5 mm and placed in silicone oil (KF-96, 100C8 manufactured by Shin-Etsu Chemical Co., Ltd.) heated to 180° C. for 16 hours to swell the coating layer.

The outer diameter of the roll at this time was 40.9 in. When fixing 40,000 sheets of transfer paper while applying oil, there were some wrinkles, poor fixing, and peeling of the rubber.
There was no F, and according to subsequent measurements, the roller diameter was 39.98.
It was mmφ. If the fixing roller of the apparatus of the present invention is configured as explained in Examples 1 and 2, even if it is used without oil swelling treatment, the performance will be lower than that of the roller based on the conventional means described above. Because you can get something comparable,
We can provide a fixing device that is more cost-effective than conventional means. 5. Agent: Makoto Kon, Patent Attorney 547-

Claims (1)

[Claims] In a heat roller fixing device equipped with an offset-proof IE liquid coating device and equipped with a heating and pressure roller as well as an elastic roller, 1.
The elastic rubber coating layer on the circumferential surface of the heating roller has a thickness of 0.4
A fixing device, characterized in that the fixing device has a temperature of less than am and is molded without undergoing oil immersion swelling treatment.