JPS6021076A - Fixing device with heat roller - Google Patents

Abstract

PURPOSE:To shorten the warming-up time of a heat roller for heat fixing and to reduce temperature difference among right, left and center parts with simple constitution by setting up a gap between an opening for inserting a heating tube and the heating tube of the heat roller to a prescribed value or less. CONSTITUTION:A suspending wall or the like is formed on the inner diameter of a roller body 1 of the heat fixing heat roller to be turned by a gear 3 or the like supported by a bearing 2 and the difference between the inner diameter of an opening into which a halogen pipe heater 4, a heating body, is inserted and the outer diameter (d) of the heater 4 is set to 2mm. or less. The gap having a slight value shortens the warming-up time of the roller body 1 with simple constitution, the temperature difference among the right, left and center parts is reduced and the rise of temperature in a recording device is also reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a heat roller fixing device for a recording device such as an electrophotographic copying machine, and particularly to a fixing device using a heat roller with a built-in fixed heat generating tube. The present invention relates to an improvement of the heating roller.

[Prior art]

Conventional heat roller fixing devices have a halogen tube with electrodes at both ends inside because they have a simple structure, are easy to maintain, have a small heat capacity, making it easy to control the temperature, and have a relatively long lifespan. A built-in heating roller is often used. However, in a recording device using such a heat roller fixing device, it takes time to warm up the heat roller fixing device, and there is a large temperature difference between the left and right sides and the center of the heating roller, and the recording device There is a problem that the temperature inside the machine tends to rise.

[Purpose of the invention]

The present invention solves the problem in the conventional heat roller fixing device as described above, which is largely related to the fact that the gap between the heating roller insertion port and the inserted heating tube is more than 3 spaces in terms of inner and outer diameters. It was done by discovering that
We provide a heat roller fixing device that has features such as a simple structure and easy temperature control, shortens warming-up time, has little temperature difference between the left and right sides and the center of the heat roller, and reduces internal temperature rise. It is something to do.

[Structure of the invention]

The present invention provides a fixing device for a recording device using a heating roller with a built-in fixed heat generating tube, wherein the heating roller has an opening on at least one shaft end side for inserting the heat generating tube therein. The heat roller fixing device is characterized in that when the heating tube is built in, the gap between the opening and the heating tube is 2 mm or less in terms of the difference in inner and outer diameters, and this configuration achieves the above object. .

〔Example〕

Hereinafter, the present invention will be explained based on illustrated examples.

FIG. 1 is a sectional view showing an example of the heating roller used in the heat roller fixing device of the present invention, FIGS. 2 and 31A are partial sectional views showing other examples of the heating roller, and FIGS. 4 and 5, respectively. are graphs showing the effects of the present invention.

1 to 3, 1 is a four-wheel body, 2 is a bearing that rotatably supports the roller body 1, 3 is a gear that rotates the roller body 1, 4 has electrodes at both ends, and the roller body 1 and is held in the fixing device frame by a socket (not shown). In the conventional heat roller fixing device, the roller body 1 shown in FIGS. 1 and 2 is supported by a bearing 2 or further has a gear 3 attached thereto, and the outer diameter of the roller body 1 is reduced at both end openings. 1 inner diameter. The gap provided by the difference (Do-cl) between the outer diameter d and the outer diameter d of the halogen tube heater 4 was 3 or more, and this gap allowed the inside and outside of the roller body 1 to communicate with each other. Therefore,
In the present invention, by providing a hanging wall portion on the inner diameter as seen in the roller body 1 of FIG. 1, or by providing a diaphragm flange portion at the open end as seen in the roller body 1 of FIG. Alternatively, as shown in the roller body 1 in FIG. The difference between the outer diameter d of @ (D
-d) is set to 2 fights or less.

In this way, there is a gap (D-d) that communicates the inside and outside of the roller body 1.
) is set to 2 mm or less, as shown in Fig. 4, the central part of the roller body 1 rises to the set temperature.
The fixing time has been shortened to 80 seconds or less, and as shown in FIG. significantly reduced. Accordingly, the rise in temperature inside the recording apparatus is also reduced. In addition, in FIGS. 4 and 5, the calorific value of the halogen tube heater 4 is so low, the thickness of the portion used for fixing the aluminum tube roller body 1 is in the following order:
The results are for the length of 300 mm, and the length is 11 (
D-d) is 3+ns or more (D Chitit: Departure j%
Although the quantity and wall thickness conditions are the same, the results are shown in the conventional heat roller fixing device as described above.

The present invention has been described above with reference to an example using a halogen tube heater, but the present invention is not limited thereto, and may also be used with infrared tube heaters, sheathed heaters, etc. It may be. moreover,
When the heating roller has a small outer diameter, the roller body may have a shape that extends from the opening to the center and has a constant inner diameter.

〔Effect of the invention〕

As described above, the present invention utilizes a simple method of reducing the gap between the inner diameter of the opening in which the heat generating tube is inserted into the roller body 1 and the outer diameter of the heat generating tube to 2 mm or less. The time required for warming up the fixing device is significantly shortened, the temperature difference between the center and left and right sides of the heat roller is also reduced, and an increase in internal temperature of the recording device is prevented.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of the heating roller used in the heat roller fixing device of the present invention, FIGS. 2 and 3 are partial sectional views showing other examples of the heating roller, and FIGS.
Each figure is a graph showing the effects of the present invention. 1...Roller body, 2...Bearing, 3...Gear,
4...Halogen tube heater, Do, D...Roller inner diameter, d...Halogen tube heater outer diameter.

Claims (2)

[Claims] (1) In a fixing device for a recording device using a heating roller with a built-in fixed heat generating tube, the heating roller has an opening on at least one shaft end side for inserting the heat generating tube therein, A heat roller fixing device characterized in that, in a state where the heat generating tube is built in, the gap between the opening and the heat generating tube is 2 spaces or less in terms of the difference in inner and outer diameters. (2) The heat roller fixing device according to claim 1, wherein the heating tube is a halogen tube having electrodes at both ends, and the heating roller has the openings at both ends.