JPH0264589A - Fixing device - Google Patents

Abstract

PURPOSE:To efficiently perform the assembling work, to attach a heat source to a roll with a high positional precision, and to reduce the cost of a fixing device by forming a heat source supporting member and the plate part of the fixing device main body into one body. CONSTITUTION:A fixing roll 1 of the fixing device is attached with a side plate 6, which is a part of the fixing device main body, as the reference, and a heating part 3 is supported by a heat source supporting member 7, which is joined with the side plate 8 as the reference of roll attachment into one body, and is held in a certain position in the roll. The heat source supporting member 7 is cut and raised from the side plate 8 with a high precision and is formed into one body. A high positional precision between a roll attachment reference part 81 and a heat source attachment reference part 71 is realized, and the number of assembling parts is reduced, and the assembling process is simplified, and the production cost of the fixing device is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a fixing device used in image forming apparatuses such as electrophotographic copying machines and laser beam printers, which fixes unfixed images by applying heat.

[Prior Art] Conventionally, when forming an image using an image forming apparatus such as an electrophotographic copying machine, various methods have been proposed and implemented as fixing methods for unfixed images. A fixing method is often used. Among these, a heat roll method using a pair of rotating bodies is often used because of its high thermal efficiency.

FIG. 3 shows a sectional view of a fixing device using the heat roll method described above. The fixing device mainly includes two rollers 1.2, and one of these rollers 1.2 (
In the illustrated example, a heat generating source 3 is provided on the roller 1). In this fixing device, when the rollers 1.2 are rotationally driven in the direction of the arrow shown in the drawing by a drive means (not shown), these rollers 1.2 sandwich and convey the object to be fixed (not shown). The developer on the object to be fixed is fixed on the object to be fixed by the pressure and the heat generated by the heat generating source 3 during conveyance. Note that the heat source 3 is generally provided on the roller 1 on the side that comes into direct contact with the unfixed developer as shown in the figure, and the roller 1 on the side where the heat source 3 is provided is particularly called a fixing roller. . The other roller 2 is generally made of an elastic material with high heat resistance such as silicone rubber, and is particularly called a pressure roller.

This heat generating source 3 is held in a hollow part within the roller.

This heat source 3, particularly when a halogen heater is used as the heat source, generally has a plurality of windings 4 in order to efficiently utilize the amount of heat, as shown in FIG.

It is necessary that the winding portion 4 is precisely positioned at the center of the heat generating source 30-1 and at a predetermined position in the longitudinal direction of the roller.

[Problems solved by the invention] The support for this roller and heat generating source is shown in FIG.

That is, the roller 1 is fixed to the side plate 6 of the fixing device, and the heat generating source 3 is fixed to the heater support plate 5.

Further, the heater support plate 5 is attached to the side plate 6 by screws or the like.

As described above, it is necessary to attach the heater support plate to the side plate, and the positional accuracy between the heater and the rollers may deteriorate due to this attachment operation.

[Means for Solving the Problems] The present invention, which solves the above problems, provides a fixing device that fixes an unfixed image using a rotating body heated by a heat source, which includes a member for positioning and supporting the rotating body, and a member for positioning and supporting the rotating body, and a member for positioning and supporting the rotating body, and a member for positioning and supporting the rotating body, and The member for positioning and supporting is an integrally molded body.

[Example] Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a drawing that best represents the features of the present invention,
In the figure, reference numeral 1 denotes a fixing roller, which is attached with reference to a side plate 6 that is a part of the main body of the fixing device. Inside this, the heat generating source 3 is supported and held at a fixed position by a side plate 8, on which roller attachment is based, and a heat generating source support member 7, which is an integrally molded body.

This heat source support member 7 is provided by cutting and raising the side plate 8 with high accuracy.

That is, the present invention provides a heat generating support member 7 that is cut and raised with high precision.
By using an integrally molded body consisting of the side plate 8 and the side plate 8, the roller mounting can achieve high precision in the position between the reference part 61 and the heat source support reference part 51, and at the same time, it is possible to reduce the number of assembled parts. In addition, the conventional bottle tightening work etc. in the assembly process can be omitted, making the work simpler and faster.

[Effects of the Invention] As explained above, by forming the heat source support member and the side plate portion of the fixing device main body into an integrally molded body, it is possible to improve the efficiency of the assembly work and to increase the accuracy of the heat source mounting position with respect to the roller. This made it possible to reduce manufacturing costs at the same time.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a part of a fixing device implemented with the present invention. FIG. 2 is a sectional view of an example of a conventional fixing device. FIG. 3 is a sectional view of a general thermal fixing device. , Cross-sectional view 1 showing an example of the heat generating source installation position in the fixing device, Fixing roller 2, Pressure roller 3, Heat generating source 4, Actual heat generating part (heater winding part) 5.70 Heat generating source support member 6.8. Fixing device main body side plate 71, heat source installation is standard part 81, fixing roller installation is standard part Applicant Canon Co., Ltd.

Claims (2)

[Claims] (1) A fixing device that fixes an unfixed image using a rotating body heated by a heat source, characterized in that the member that positions and supports the rotating body and the member that positions and supports the heat source are integrally molded. fixing device. (2) The rotating body has a gear at one end, and at least
2. The fixing device according to claim 1, wherein the rotating body at the end opposite to the gear and the member for positioning and supporting the heat source are integrally molded.