JPH0529065A - Manufacture of fixing roller - Google Patents

Abstract

PURPOSE:To no prevent a fixing roller from being broken due to heat generation by forming a heat generating resistor layer on a cylindrical roller base member made of a low thermal conductive material, and covering the surface except for portions where electrodes for a roller are formed with a fluororesin layer, followed by soaking in fusing solder. CONSTITUTION:A heat generating resistor layer 2 is formed on a roller substrate 1 made of a low thermal conductive material. The heat generating resistor layer 2 except for portions where electrodes 5 are formed is covered with a fluororesin layer 3. An oxide film on the exposed heat generating resistor layer 2 in a portion not covered with the fluororesin layer 3 is removed. A solder bath is formed in a solder tank, and the electrodes 5 are formed by solder dip coating. Consequently, adhesiveness between the electrodes 5 and the heat generating resistor layer 2 can be enhanced so that breakage of a fixing roller 6 due to heat generation can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a fixing roller used in an electrophotographic copying machine or the like.

[0002]

2. Description of the Related Art Conventionally, in an electrophotographic printer or a copying machine, a charged photosensitive drum is irradiated with a light source to form an electrostatic latent image on its surface, and toner is attached to the electrostatic latent image. The toner image is transferred to the recording medium after being developed.

As a fixing roller used in the electrophotographic printer or copying machine, a heater is built in a metal pipe made of aluminum or the like, and the metal pipe is heated to 180 to 200 ° C. by the heat generated by the heater. The toner is heated to a certain degree, and the toner is thermally fixed by passing the developed paper between the metal pipe and the pressure roller (see Japanese Utility Model Laid-Open No. 61-160464).

In the case of the fixing roller having the above construction, it takes about 5 minutes for the rise time after the heater is turned on until the surface temperature of the metal pipe reaches about 180 to 200 ° C., which is usually usable, and 1 KW. Requires electricity. Therefore, there is provided a fixing roller in which heat rising time is shortened and power consumption is reduced.

FIG. 2 is a sectional view of a fixing roller which consumes less power. As shown in the figure, in the fixing roller, a heating resistor layer 2 is formed on the surface of a roller base material 1 formed of a material having low thermal conductivity such as glass, enamel, and ceramics, and the surface thereof is formed by a fluororesin layer 3. The heating resistor layer 2 has a structure in which ring-shaped electrodes 4 are attached to both ends of the heating resistor layer 2, and a voltage is applied between both electrodes 4.

In the case of the fixing roller having the above-mentioned structure, the rise time of heat can be reduced to about 1/5 or less of that in the conventional case, and the power consumption can be reduced.

[0007]

However, in the method of manufacturing the fixing roller having the above structure, when the ring-shaped electrodes 4 are attached to both ends of the heating resistor layer 2, precision is required for the work, which is difficult. It becomes a process and is not suitable for mass production. Further, when the electrode 4 is formed by thick film printing or the like, the adhesiveness between the heating resistor layer 2 and the electrode 4 is poor, and the vicinity of the electrode 4 may be heated and oxidized to damage the heating resistor layer 2. ..

The present invention solves the problems of the above-mentioned conventional fixing roller manufacturing method, facilitates the work of forming electrodes, and provides a fixing roller manufacturing method in which the heating resistor layer is not damaged. The purpose is to

[0009]

Therefore, in the method of manufacturing a fixing roller according to the present invention, plating, thick film printing, vacuum deposition, etc. are performed on the surface of a cylindrical roller base material formed of a material having low thermal conductivity. The heating resistor layer is formed by the method, and the surface of the roller on which the heating resistor layer is formed except the electrode forming portion is covered with the fluororesin layer.

The heating resistor layer is exposed at the portion where the electrodes of the roller are formed, and this portion is dipped in molten solder for dip coating.

[0011]

According to the present invention, a heating resistor layer is formed on the surface of a cylindrical roller base material formed of a material having low thermal conductivity as described above, and a roller having the heating resistor layer is formed. The surface excluding the portions where the electrodes are formed is covered with a fluororesin layer. The fluororesin layer forms an insulating layer.

The heating resistor layer is exposed at the portion where the electrode of the roller is formed, and this portion is dipped in molten solder to perform dip coating. The part covered with solder becomes an electrode.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 is a process diagram of a method for manufacturing a fixing roller of the present invention, FIG. 3 is a sectional view of a fixing roller manufactured by the method of manufacturing a fixing roller of the present invention, and FIG. 4 is a state diagram of solder dip coating.

In FIG. 3, reference numeral 1 denotes a roller base material, which is made of a material having a low thermal conductivity such as glass, enamel, phenolic resin and ceramics, and has an outer diameter of 16 to 30 mm, a length of 285 mm and a wall thickness of 0.5 to. It consists of a 1.5 mm pipe. Reference numeral 2 is a heating resistor layer formed on the surface of the roller base material 1 by plating, thick film printing, vacuum deposition or the like, and 3 is a fluororesin layer which covers the heating resistor layer 2 and forms an insulating layer. Reference numeral 5 is an electrode formed by solder dip coating on both ends of the roller base material 1 on which the heating resistor layer 2 is formed, and 6 is a fixing roller.

FIG. 1 shows a method of manufacturing the fixing roller 6 having the above structure.
It will be explained based on. Step S1 The electroless Ni-WP plating is applied to the roller base material 1 to form the heating resistor layer 2 having a thickness of 0.1 to 0.2 μm. The formation of the heating resistor layer 2 is not limited to electroless Ni-WP plating, but may be formed by vacuum vapor deposition or thick film printing. Step S2 A fluororesin layer 3 of PFA resin or the like is coated on the surface of the heating resistor layer 2 except for the portion where the electrode 5 is formed by 10 to 30 μm. Step S3 An oxide film formed on the exposed surface of the heating resistor layer 2 which is not covered with the fluororesin layer 3 at both ends of the roller on which the heating resistor layer 2 is formed, which is formed by the annealing treatment in the previous step. To remove. In this case, barrel finishing is performed using an abrasive such as ceramics. Ultrasonic cleaning with a cleaning agent for 10 minutes,
dry. Step S4 Flux (WF, Senju Co., Ltd.) is applied to one side of the heating resistor layer 2 at both ends of the dried roller.
Apply 37) to improve solder wetting. Step S
5 The portion coated with the flux is preheated to 200 to 300 ° C. by a heating means such as a hot air gun or a constant temperature bath. Step S6 As shown in FIG. 4, a solder bath 7b is formed in the solder bath 7a, the preheated heating resistor layer 2 is dipped in the solder bath 7b, and the electrode 5 is formed by solder dip coating.

The solder dip coating uses high temperature solder (Nihon Handa Co., Ltd., JS-ST-530, melting temperature 221 ° C.), and the temperature of the solder bath 7b is 270 to 270.
Keep at 280 ° C. Step S7 Similarly, the electrode 5 is formed on the opposite side of the roller, and the residual flux is removed by washing with warm water.

As described above, the electrode 5 is about 0.05 to
It is formed by a solder film having a thickness of 0.1 mm. The fixing roller 6 is manufactured by such a process. FIG. 5 is an operation state diagram of the fixing roller. A brush 8 is brought into contact with the electrode 5 by a spring 9 at a predetermined pressure. The brush 8 is made of a carbon-based material such as graphite, and is housed in a brush holder 10 fixed to the entire device. Reference numeral 11 is a lead wire for supplying power to the brush 8.

The present invention is not limited to the above embodiments, but various modifications can be made based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

[0019]

As described in detail above, according to the present invention, a heating resistor layer is formed on the surface of a cylindrical roller base material made of a material having low thermal conductivity, and the heating resistor layer is formed. The surface of the roller on which the electrodes are formed, excluding the portion where the electrodes are formed, is coated with a fluororesin layer. Then, the exposed portion of the heating resistor layer is immersed in the molten solder to form an electrode.

Therefore, since the adhesion between the electrode and the heat generating resistor layer is improved, heat is not generated between the electrodes while the fixing roller is in use, and the fixing roller is prevented from being damaged by heat generation. Can be prevented.

[Brief description of drawings]

FIG. 1 is a process diagram of a method for manufacturing a fixing roller of the present invention.

FIG. 2 is a cross-sectional view of a fixing roller with low power consumption.

FIG. 3 is a sectional view of a fixing roller manufactured by the fixing roller manufacturing method of the present invention.

FIG. 4 is a state diagram of solder dip coating.

FIG. 5 is an operation state diagram of a fixing roller.

[Explanation of symbols]

 1 Roller Base Material 2 Heating Resistor Layer 3 Fluororesin Layer 5 Electrode 6 Fixing Roller

Claims (1)

Claims: 1. A heating resistor layer is formed on the surface of a cylindrical roller base material made of a material having low thermal conductivity, and (b) the heating resistor layer is formed. A fixing roller, characterized in that the surface of the formed roller excluding the electrode forming portion is coated with a fluororesin layer, and (c) the electrode forming portion of the roller is immersed in molten solder. Method.