JPH1130922A - Fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten waiting time at the time of starting a device and to reduce power consumption and cost by removably fitting a power feeding cap into a heating roller main body. SOLUTION: A cylinder 11 made of resin is fitted into the side end opening of the heating roller main body and the power feeding cap 12 is fixed/fitted in the top end opening of the cylinder 11 by a screw. As the cap 12, it is preferable that the outer periphery of Al is plated with nickel. Then, a supporting holder is fitted to a fixing device main body, an electrode holder arranged in the cylinder 11 is attached to the supporting holder by the screw and a power feeding brush abutted on the cap 12 is attached to the electrode holder with a leaf spring. Further, a screw hole 21 is provided in a base body 3, a through hole 19 is provided in the position facing the screw hole 21, of the cylinder 11 and a set screw 22 is inserted into the through hole 19 of the cylinder 11 and the screw hole 21 of the base body 3 to attachably/detachably fix the cylinder 11 and the base body 3. Thus, when a power source is applied, the surface of a heating roller quickly reach a fixing temp.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device having a heating roller and a pressure roller.

[0002]

2. Description of the Related Art Conventionally, this type of fixing device rotates a pressure roller against a heating roller and presses the heating roller to fix an unfixed toner image on the recording paper onto the recording paper. In such a fixing device, the surface temperature of the heating roller is maintained constant within the fixing temperature, and when the power is turned on, the surface of the heating roller quickly reaches the fixing temperature, and the waiting time at the time of startup is reduced, It is also required to reduce power consumption and reduce costs.

[0003]

As a device which can realize such a thing, a device provided with members common to this embodiment is not disclosed, but has been proposed by the applicant of the present application. I have. Such a fixing device will be described with reference to the drawings showing an embodiment of the present invention. It has a heating roller 1 and a pressure roller 2 for fixing an unfixed toner image on the recording paper to the recording paper between the heating roller 1 and the heating roller 1 by rotating in pressure contact with the heating roller 1. It has a cylindrical substrate 3, an insulating film 4 and a heating resistor pattern 6 are sequentially formed on the inner peripheral surface of the substrate 3, and a power supply cap 12 is attached to a side end opening of the heating roller body.

In this fixing device, when a voltage is applied to the power supply cap 12 during a fixing operation, a current flows through the heat generating resistor pattern 6 to generate Joule heat, and the Joule heat directly heats the heating roller 1, and the conventional heating device In the same manner as described above, the unfixed toner image on the recording paper is fixed on the recording paper between the heating roller 1 and the pressure roller 2 which rotates by pressing. By doing so, when the power is turned on, the surface of the heating roller quickly reaches the fixing temperature, the waiting time at the time of startup can be shortened, the power consumption can be reduced, and the cost can be reduced. It is possible to meet such a demand.

However, in the fixing device, the release layer of the heating roller may be damaged and must be replaced. In such a case, in the above-described case, although the heating resistor pattern 6 and the power supply cap 12 are still sufficiently usable, they have to be replaced together, so that there is a problem that an increase in cost cannot be avoided. .

In view of the foregoing, an object of the present invention is to meet the above-mentioned demands, and when the power is turned on, the surface of the heating roller quickly reaches the fixing temperature, shortening the waiting time at the start-up and reducing the power consumption. In addition to being able to achieve cost reduction by using the proposed device, when the base, heating resistor pattern, or power supply cap becomes unusable, it can no longer be used without replacing all of them. It is necessary to provide an inexpensive fixing device simply by replacing the device.

[0007]

According to the present invention, in order to achieve the above object, an invention according to claim 1 is characterized in that a heating roller and a heating roller which is pressed against the heating roller and rotated. And a pressure roller for fixing the unfixed toner image on the recording paper to the recording paper, the heating roller has a cylindrical substrate, an insulating film on the inner peripheral surface of the substrate, and a heating resistance pattern. Are sequentially formed and a power supply cap is attached to a side end opening of the heating roller main body, wherein the power supply cap is detachably attached to the heating roller main body.

According to a second aspect of the present invention, in the first aspect of the present invention, the heating resistor pattern is formed detachably on the base.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the first embodiment of the present invention shown in FIGS. 1 to 3, the same parts as those of the above-mentioned proposal are denoted by the same reference numerals, and the description thereof will be omitted. This embodiment has a heating roller 1 and a pressure roller 2 that presses and rotates against the heating roller 1 to fix an unfixed toner image on the recording paper to the recording paper between the heating roller 1 and the heating roller 1. . The heating roller 1 has a cylindrical base 3 made of metal such as Al or Fe. A release layer 8 made of Teflon or the like is formed on the outer peripheral surface of the base 3, and an insulating polyimide material is formed on the inner peripheral surface. A film 4 is provided, and a heating resistance pattern 6 using a carbon fiber as a conductor and a copper foil 7 are mounted on the inner periphery thereof. The insulating film 4 may be fixed to the heating resistor pattern 6.

A cylindrical body 11 made of resin is detachably fitted to the side end opening of the heating roller main body, and a power supply cap 12 is fixedly attached to the front end opening with a screw.
The outer periphery of which is subjected to nickel treatment is preferred. Then, the support holder 14 is attached to the fixing device main body (not shown),
The electrode holder 16 arranged in the cylindrical body 11 is
The power supply brush 17 that comes into contact with the power supply cap 12 is attached to the electrode holder 16 via a leaf spring 18. A screw hole 21 is provided in the base 3, and the screw hole 21 of the cylindrical body 11 is provided.
A through hole 19 is provided at a position opposing to 21, and a set screw 22 is inserted into the through hole 19 of the cylindrical body 11 and the screw hole 21 of the base 3, and these are detachably fixed.

In this embodiment, during the fixing operation, the heating resistor pattern 6 is supplied via the power supply brush 17 and the power supply cap 12.
The heating roller 1 is heated to supply heat to the heating roller 1 and the pressure roller 2 is pressed against the heating roller 1 and rotated in the same manner as in the prior art so that the unfixed toner The image is fixed on the recording paper. By doing so, when the power is turned on, the surface of the heating roller quickly reaches the fixing temperature, the power consumption can be reduced, the cost can be reduced, and the base 3 or the power supply cap 12 cannot be used. In this case, it is only necessary to remove the set screw 22 inserted in the through hole 19 of the cylindrical body 11 and the screw hole 21 of the base 3 and replace only necessary ones.

In a second embodiment of the present invention shown in FIGS. 4 and 5, a heating resistor pattern 6 and a copper foil 7 are detachably mounted on a base 3, and a screw hole 21 and a cylindrical body of the base 3 of the heating resistor pattern 6 are provided. The only difference from the first embodiment is that a through-hole 20 is provided at a position facing the through-hole 19 of 11, and a set screw 22 is inserted into these holes 19, 20, and 21 to fix them. In other respects they agree. A drive gear (not shown) is fitted in a position facing the opening edges of the base 3 and the heating resistor pattern 6.
Formed notches 23 and 24 are formed, and a rib 26 extending inward is provided at the edge of the hole of the notched portion 23. When the heating resistor pattern 6 is assembled to the base 3, the notch 24 of the heating resistor pattern 6 is removed. rib
It will fit along 26.

In such a case, when the base 3, the heating resistor pattern 6, or the power supply cap 12 becomes unusable, the through hole 19 of the cylindrical body 11, the through hole 20 of the heating resistor pattern 6, and the base Set screw inserted in screw hole 21 of No. 3
All you have to do is remove 22 and replace only those that are no longer available.

[0014]

According to the present invention, there is provided a pressure roller for fixing an unfixed toner image on a recording paper to a recording paper between the heating roller and the heating roller by rotating by pressing against the heating roller. The heating roller has a cylindrical base, an insulating film and a heating resistance pattern are sequentially formed on the inner peripheral surface of the base, and a power supply cap is attached to a side end opening of the heating roller main body. In the fixing device, the power supply cap is detachably attached to the heating roller main body, so that when the power is turned on, the surface of the heating roller quickly reaches the fixing temperature,
The waiting time at startup can be shortened, the power consumption can be reduced, the cost can be reduced, and even if the base or power supply cap becomes unusable, only the unusable one is replaced. This has the effect of being cheap.

According to a second aspect of the present invention, in the first aspect of the present invention, since the heating resistor pattern is formed detachably on the base, the base, the power supply cap or the heating resistor pattern cannot be used. However, there is an effect that the cost can be reduced by replacing only the unusable one.

[Brief description of the drawings]

FIG. 1 is a front view of a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of the heating roller according to the first embodiment.

FIG. 3 is an exploded perspective view showing the same base and power supply cap.

FIG. 4 is an exploded perspective view showing a base, a heating resistor pattern, and a power supply cap according to a second embodiment of the present invention.

FIG. 5 is a drawing of FIG. 4 as viewed in the direction of the chain line 5.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating roller 2 Pressure roller 3 Base 4 Insulating film 6 Heating resistance pattern 7 Copper foil 8 Release layer 11 Cylindrical body 12 Power supply cap 14 Support holder 16 Electrode holder 17 Power supply brush 18 Leaf spring 19 Through hole 20 Through hole 21 Screw hole 22 Set screw 23 Notch 24 Notch 26 Rib

Claims (2)

[Claims] A heating roller that presses and rotates on the heating roller to fix an unfixed toner image on the recording paper to the recording paper, wherein the heating roller has a cylindrical shape. A fixing member having a base in the form of an insulating film and a heating resistor pattern sequentially formed on the inner peripheral surface of the base, and a power supply cap attached to a side end opening of a heating roller main body. A fixing device, which is detachably attached to a main body. 2. The fixing device according to claim 1, wherein the heat generating resistance pattern is detachably provided on the base.