JPS61107276A - Heat-fixing device - Google Patents

Abstract

PURPOSE:To easily adjust peripheral members, by providing openings. through which each peripheral member can be brought into or taken out freely, at the base of a heat insulating cover around a heating roll and inserting each member from the openings, and then, mounting the fixing section of each member onto the base of the heat insulating cover from the outside freely attachably and detachably. CONSTITUTION:Openings 23 and 24 provided at the base of a heat insulating cover 11 respectively have sizes suitable for inserting and removing a cleaning blade 12 and temperature fuse 15 in and against the direction shown by the arrow (x). Moreover, the holding member 14 of the cleaning blade 12 and holding member 17 of the temperature fuse 15 are fixed to the base of the cover 10 by screws 25 and 25', respectively, under removal-free conditions and a heat resisting case 11 is fitted to the heat insulating cover 10 freely attachably and detachably. Therefore, the adjustment of the members can be performed easily in such a way that the fitting position of the temperature fuse 15 and cleaning blade 12 can be adjusted by loosening the screws 25 and 25' after the heat resisting case 11 is removed. After the adjustment, the screws 25 and 25' are tightened and the heat resisting case 11 is fitted to complete the adjustments of members.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is directed to a toner image formed on a support such as a piece of paper in an image forming apparatus such as an electrophotographic apparatus or an electrostatic printing apparatus.
The present invention relates to a heat fixing device that is fixed between a pair of rollers, at least one of which has a heating mechanism and rotates in pressure contact with each other.

[Prior art and its problems]

As one of the fixing devices in an image forming apparatus, a heat-resistant release material such as tetrafluoroethylene or perfluoroalkoxy resin is coated on the surface of a metal core with good thermal conductivity that has a heat source such as an infrared lamp, /10 gen lamp or nichrome wire inside. A heat fixing device made of a heat roll is known, which includes a heat roll having a heat-resistant elastic layer and/or a heat-resistant elastic layer such as silicone rubber, and a pressure roll whose surface is covered with a heat-resistant elastic layer. .

There are various structures for this type of fixing device, and generally a roll arrangement is often adopted in which the heating roll is the upper roll and the pressure roll is the lower roll (for example,
(Refer to No. 145655, Special Publication No. 19547 of 1983)
Depending on the structure of the image forming apparatus, a heating roll may be disposed below the pressure roll. (For example, Tokuko Sho 57-
Refer to Japanese Patent No. 46794. FIG. 2 is a sectional view showing an example of a heat fixing device in which a pressure roll is used as an upper roll.

In the figure, reference numeral 1 denotes a pressure roll, which is formed by covering the outer peripheral surface of a metal hollow core 2 with a heat-resistant elastic layer 3. 4
A heating roll is formed by covering the outer peripheral surface of a metal hollow core 6 having a heat source 5 therein with a heat-resistant outhouse layer 7. The pressurizing bar 1 is surrounded by a heat insulating cover 8, and a heat resistant case 9 is attached to the outside of the cover 8. heating roll 4
It is also surrounded by a heat insulating cover 10, and a heat resistant case 11 is attached to the outside of the cover 10. Also, heating a-le 4
A cleaning blade 12 whose edge is in contact with the surface of the cleaning blade 12 is attached to a support plate 15 , the support plate 15 is supported by a holding member 14 , and the holding member 14 is fixed to the heat insulating cover 10 . Further, a temperature fuse 15 is provided close to the heating roll 4, and the temperature fuse 15 is attached to the support plate 1 (SK is attached to the support plate 1).
The support plate 16 is fixed on the holding member 17, and the holding member 17
is fixed to the heat insulating cover 10. Note that 18 indicates a paper feed guide, 19 indicates a paper discharge guide, and 20 indicates a separation claw.

According to such a configuration, power is supplied to the heat source 5 to heat the surface of the heating roll 4 to a temperature necessary for fixing, and the heating roll 4 is heated to a temperature necessary for fixing.
Rotate the and pressurizing wheel 1 in the direction of the arrow shown in the figure to remove the toner @
The toner particles 21 are fixed on the support body 22 by conveying the support body 22 holding the toner particles 21 along the paper feed guide 18 in the direction of the arrow shown in the figure.

A problem with the above-mentioned fixing device is that, after the fixing device is completely assembled, the mounting positions of the cleaning blade, temperature heater, and other members provided around the heating roll cannot be adjusted. That is, as for the cleaning member, since the edge of the blade 12 is in contact with the surface of the roll 4, the blade may wear out or become misaligned, and readjustment may be necessary. Also, the temperature and needs also depend on the temperature distribution, etc. ＃It may be arranged. However, with the structure shown in FIG. 1, adjustment is impossible unless the cover 10 and the case 11 are removed, and there is a problem in that it takes time and effort.

1゛□ [Object of the Invention] An object of the present invention is to solve the above-mentioned problems of the prior art, and to easily adjust the peripheral members of the heating roll, such as the cleaning member. [Summary of the Invention] The present inventors have provided a heating roll having a heating function below a pressure roll, and the above-mentioned pressure roll. For a heating fixing device having a structure in which a heat insulating cover and a heat-resistant case are arranged around the roll and the heating roll, and peripheral parts such as a temperature fuse and a cleaning member are provided around the heating roll, adjustment of each of the above parts is facilitated. After careful consideration, we found that the following configuration is appropriate.

If necessary, provide an opening in the bottom of the heat insulating cover around the heating roll through which each of the above members can come in and out, insert each of the above members through this opening, and attach the fixing portion of each member to the bottom of the heat insulating cover. It is a Yokotori that can be attached and detached from the outside.

[Embodiments of the invention]

The details of the present invention will be explained below with reference to the drawings.

Here, FIG. 1 is a sectional view of a heat fixing device according to an embodiment of the present invention.

In the same figure, parts equivalent to those in FIG.
The heat-resistant case 9 is the same as that shown in FIG. Next, it is similar to FIG. 2 in that an ambient temperature check 15 for the heating roll 1 and a cleaning blade 12 are provided, and a heat insulating cover 10 and a heat resistant case 11 are also provided.

However, the present invention is significantly different from FIG. 1 in the following points.

Openings 25, 24 are provided at the bottom of the heat insulating cover 11, and these openings 23 and 24 are arranged so that the cleaning blade 12 and the temperature fuse 15 are located on the lower side (arrow
It has a size that allows it to be inserted and removed from the same direction. Further, the cleaning blade holding member 14 and the temperature heat holding member 17 are both fixed to the lower surface of the bottom of the cover 10 with screws 25.2 and are detachable. Further, the heat-resistant case 11 is detachably attached to the heat insulating cover 10.

According to such a configuration, the following adjustment work can be performed extremely easily.

First, if you remove the heat-resistant case 11, screw the 25°25
The adjustment of the above members is completed by loosening the screws 25 and 25' to adjust the mounting positions of the temperature heater and the cleaning blade, then tightening the screws 25 and 25' and installing the heat-resistant case 11.

〔Effect of the invention〕

As described above, the present invention has a structure in which the mounting positions of the temperature control member and cleaning member disposed around the heating roll, which is the lower roll, can be adjusted from outside the heat insulating cover and from below, so that the above members can be adjusted. The effect is that the work becomes extremely easy.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a conventional heat fixing device, and FIG. 2 is a schematic sectional view of a heat fixing device according to an embodiment of the present invention. 1: Pressure roll, 4: Heating roll, 8, 10: Heat insulation cover, 9, 11: Heat resistant case, 12: Cleaning blade, 15: Temperature check, 14, 17: Support member,
25.24: Opening

Claims (1)

[Claims] 1. A heating roll having a heat generating function is disposed below the pressure roll, and both rolls are brought into pressure contact with each other, the pressure roll and the heating roll are surrounded by a heat insulating cover, and a heat resistant case is placed outside the heat insulating cover. In a heat fixing device in which a heating temperature adjusting member and a cleaning member are installed around the heating roll, an opening into which the adjusting member and the cleaning member can be inserted is provided on the bottom surface of the heat insulating cover, and the heating temperature adjusting member and the cleaning member are inserted through the opening. A heat fixing device characterized in that a lower end of each member is extended and the extended portion is detachably attached to the heat-resistant case.