JPH03164775A - Heat roller fixing device - Google Patents

Abstract

PURPOSE:To reduce friction coefficient between a heat roller and a bearing by providing fluorine contained resin layer on the fixing area of the surface of the heat roller and the area of a bearing. CONSTITUTION:The fluorine contained resin layer 10 is provided on the fixing area of the surface of the heat roller(pipe) 1 whose both ends are supported by the bearings 3a and 3b and the bearing area. Namely, the fluorine contained resin layer 10 is provided on the bearing area besides the fixing area of the heat roller 1, so that it may be substituted as the lubricant of the right and left bearing parts 3a and 3b. Therefore, the friction coefficient between the heat roller 1 and the bearings 3a and 3b is made small without having trouble and using an expensive bearing. Then, loading torque is lowered and the abnor mal abrasion of the heat roller 1 is prevented.

Description

[Detailed description of the invention] 〔table of contents〕 overview Industrial applications Conventional technology (Figure 3) Problems that the invention aims to solve Means to solve the problem (Figure 1) action Example (a) Description of one embodiment (Fig. 1.

(b) Description of Other Embodiments Effects of the Invention (Figure 2) [Summary] This invention relates to a heat roller fixing device having a heat roller and a pressure roller.

The purpose is to reduce the coefficient of friction between the heat roller and the bearing without the hassle or use of expensive bearings.

In a heat roller fixing device having a heat roller whose both ends are supported by bearings and a pressure roller provided to apply pressure to the heat roller, a fluororesin layer is provided on at least the fixing area and the bearing area of the surface of the heat roller. Established.

[Industrial application field]

The present invention relates to a heat roller fixing device having a heat roller and a pressure roller.

In electrophotographic devices and electrostatic recording devices, a heat roller fixing device is used to fix toner images on paper. In this heat roller fixing device, the heat roller is supported by bearings at both ends, so there is no contact with the bearings. It is desired to reduce wear.

[Conventional technology]

FIG. 3 is an explanatory diagram of the prior art.

As shown in Figure 3, the heat roller fixing device is composed of a heat roller 1 and a pressure roller 2, which rotate the paper P with the toner image T on the side of the heat roller 1. (= Insert the sheet, press the paper P against the heat roller 1 with the pressure roller 2, and use the heating power of the heat roller 1 to press the paper P.
The heat roller 1 melts and fixes the toner T on the paper sheet P. Since the heat roller 1 melts the toner T on the paper P (2) and melts it, the molten toner also adheres to the heat roller 1.

For this reason, the heat roller 1 is cleaned with a felt cleaner (not shown), but even with this cleaning, the attached toner cannot be removed.

So-called burn-in may occur.

In order to prevent this toner from sticking, conventionally the fixing area of the heat pipe (roller) 1 has been coated with a fluororesin (for example, trade name "Teflon") as shown in FIG. 3 (5).

Further, both ends of the heat pipe 1 are supported by bearings 3a and 3b for rotation of the heat pipe 1, and a gear 4 provided at the end of the heat pipe 1 is driven by a power source to rotate it. Since the heat pipe 1 is made of aluminum and is used at high temperatures, it is extremely susceptible to wear.

Therefore, it is necessary to reduce the coefficient of friction between the bearings 3a, 3b and the heat pipe 1, and conventionally the bearing 3a has been used.

There is a method of coating the contact surface of the heat pipe 1 inside the bearing 3b with fluororesin, and a method of coating the bearings 3a and 3b themselves with the main material (PPS).
The method used was to mix chino resin with fluororesin.

[Problem to be solved by the invention]

However, the method of coating the inside of the bearings 3a and 3b with fluorine requires a lot of effort and labor because it coats the narrow inside. The method using a mixture of these had the problem that the materials themselves were expensive.

Therefore, it is an object of the present invention to provide a heat roller fixing device that can reduce the coefficient of friction between the heat roller and the bearing without requiring much effort and without using expensive bearings. 0 [Means for Solving the Problems] FIG. 1 is a principle diagram and a front view of an embodiment of the present invention.0 The present invention is as shown in FIG. 1; 21 Both ends are bearings 3a.

The heat roller 1 supported by 3b and the heat roller 21
In a heat roller fixing device having a pressure roller 2 provided under pressure, a fluororesin layer 10 is provided on at least the fixing area and the bearing area of the surface of the heat roller 1. [Function] The present invention In addition to the fixing area of the heat roller 1, a fluororesin layer is also provided in the bearing area, and is used as a lubricant for the left and right bearing parts.

The coating of fluororesin on the bearing area of heat roller 1 is as follows:
Coat the fixation area at the same time (because it can be done twice).

Compared to the method of coating the inside of the bearings 3a, 3b with fluororesin, it requires much less effort.Also, the bearings 3a, 3b
Since the bearing does not need to be made of a material containing fluororesin, the bearing itself can be made inexpensive. [Embodiment] (a) Description of an embodiment FIG. 2 is a sectional view of an embodiment of the present invention.

The description will be made using FIG. 1 as a front view of one embodiment.

As shown in FIG. 1, the heat rollers 1 and 2 are coated with fluororesin 10 uniformly from bearing 3a to bearing 3b as indicated by dotted lines.

In other words, the area is expanded from the conventional fixing area to both sides, and both bearings 3
The fluororesin 10 is extended and coated up to a and 3b.

On the other hand, the bearings 3a and 3b are made of molded resin and have a U-shape as shown in FIG.

A heat pipe 1 is housed in the inner surface.

Connection wires 5 are provided around the bearings 3a and 3b,
It is connected to a coil spring 6 around a pressure roller 2 provided on the heat pipe 1, and presses the pressure roller 2 in the direction of the heat pipe 1.

Therefore, the heat pipe 1 is housed in the U-shaped bearings 3a, 3b, the pressure roller 2 is provided, the coil spring 6 is provided around the 2, and both ends of the coil spring 6 are connected to the connection wire 5 provided around the bearings 3a, 3b. By connecting them, a heat roller fixing device is completed.

The U-shaped bearings 3a, 3b and the coil spring 6 make it extremely easy to assemble the two.

In the heat roller fixing device configured in this way, the fluororesin is coated from the left bearing part to the right bearing part of the heat pipe 1 to form the fluororesin layer 10. It serves to prevent toner sticking, and acts as a lubricant on the bearings at both ends.

When coating the fixing region of the heat pipe 1 with fluororesin, the fluororesin layer 10 only needs to extend the coated area to the bearing portion.

Therefore, it is possible to eliminate the complicated labor of separately coating the inner surfaces of the narrow bearings 3a and 3b with fluororesin as in the past, and there is no need to use expensive resin materials containing fluororesin for the bearings 3a and 3b. , can be constructed at low cost.

(b) Description of other embodiments In the embodiments described above, the entire surface of the heat pipe 1 from the bearing 3a to the bearing 3b is coated with fluororesin.
Coat only the fixing area and bearing area.

The area between the fixing area and the bearing area may not be coated.

Further, the bearing portion is not limited to the U-shape, but may be of other shapes.

Although the present invention has been described above with reference to embodiments, the present invention can be modified in various ways according to the gist of the present invention.

These are not excluded from the present invention.

〔Effect of the invention〕

As explained above: According to the present invention.

■ The fixing area and bearing area of the heat roller 1 are coated with fluororesin, and this coating can be done at the same time, so there is no need to separately coat the inside of the narrow bearings 3a and 3b with fluororesin, and the coefficient of friction between the heat roller 1 and the bearings can be reduced. Since it can be made smaller, it has the effect of reducing one effort and the number of man-hours.

■ Also, since the bearing does not need to be constructed from a material containing fluororesin, the bearing itself can be constructed at a low cost.
Cheap configuration with reduced friction coefficient.

It is possible to reduce the load torque and prevent abnormal wear of the heat roller.

4,

[Brief explanation of the drawing]

FIG. 1 is a principle diagram and a front view of an embodiment of the present invention. FIG. 2 is a sectional view of one embodiment of the present invention. FIG. 3 is an explanatory diagram of the prior art. In the figure, 1... Heat roller (pipe). 2...Pressure roller. 3a, 3b...Bearings. 10...Fluororesin layer.

Claims (1)

[Claims] A heat roller (
1), and a pressure roller (2) provided to pressurize the heat roller (1), in which at least the fixing area and the bearing area of the surface of the heat roller (1),
A heat roller fixing device characterized by being provided with a fluororesin layer (10).