JPH04359278A - Fixing device for electronic image forming device - Google Patents

Abstract

PURPOSE:To make it difficult that the surface of a heating roller is scratched and to reduce the deterioration of image quality by arranging at least one of a peeling pawl, a temperature detecting element and a fuse on the same circumference as a pressed part by a pressing spring for a cleaning felt. CONSTITUTION:The peeling pawl 6, the temperature detecting element 10 and the fuse 11 are all or optionally disposed on the same circumference as the pressed part by the pressing spring 15 which presses the cleaning felt 14 on the outer periphery of the heating roller 1. Toner adhering to the surface of the heating roller 1 is removed by the felt 14. At such a time, the toner is efficiently removed by the pressed part by the spring 15 for the cleaning felt, and thereafter the toner does not adhere to the peeling pawl 6, the temperature detecting element 10 and the fuse 11 which are disposed. Thus, the following troubles are decreased that the heating roller 1 is scratched by the toner adhering to the peeling pawl 6, the temperature detecting element 10 and the fuse 11.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device for an electronic image forming apparatus having a heating roller cleaning felt.

0002

2. Description of the Related Art In recent years, electronic image forming apparatuses have made remarkable progress. A conventional fixing device will be described below with reference to FIGS. 2 and 3.

In the figure, reference numeral 1 denotes a heating roller, and a heating element 2 made of a halogen lamp is disposed in the center thereof. A pressure roller 3 is brought into contact with the outer periphery of the heating roller 1 with an appropriate pressure using a spring 4, and a peeling claw 6 for peeling off the paper is brought into contact with the outer periphery of the heating roller 1. Further, a cleaning felt 14 impregnated with an appropriate oil is pressed against the outer periphery of the heating roller 1 by a pressing spring 15 with an appropriate pressure.

In the figure, 5 is a pressure roller bearing, 7 is a peeling claw supporter, 8 is a fixing device base frame, 9 is a paper inlet chute member, and 10 is a temperature controller for controlling the surface temperature of the heating roller 1. Temperature measuring element, 11 is a fuse for safety in case of thermal runaway of heating element 2, 12 and 13 are respective covers, 16
1 is paper, and 17 and 18 are paper ejection rollers.

The operation of the fixing device configured as described above will be explained below. The paper 16 carrying unfixed toner by the image forming apparatus is heated to an appropriate temperature by the heating element 2 by the paper inlet chute member 9, and the heating roller 1 is heated to an appropriate temperature by the pressure roller spring 4. The image is guided to a pressure roller 3 that is in pressure contact with the image forming apparatus, and is fixed by heat and pressure. Fixed paper 1
The sheet 6 is peeled off from the heating roller 1 by the peeling claw 6, and is discharged from the apparatus by the paper discharge rollers 17 and 18. At this time, the surface temperature of the heating roller 1 is controlled by a temperature measuring element 10, and a fuse 11 is used as a safety measure in case of thermal runaway of the heating element 2. Further, in order to maintain the quality of the image formed on the paper 16, a cleaning felt 14 pressed with an appropriate pressure by a pressing spring 15 is used to remove toner adhering to the heating roller 1.

[0006]

However, in the above-mentioned conventional structure, when toner is not completely removed by the cleaning felt 14, the toner adheres to the surfaces of the peeling claw 6, the temperature sensing element 10, and the fuse 11. This not only damages the surface of the heating roller 1 and significantly lowers the image quality, but also makes it impossible for the peeling claw 6 to peel the paper normally if toner adheres to the contact point with the heating roller 1. Furthermore, in the temperature sensing element 11, if toner adheres to the vicinity of the element surface, the accuracy of surface temperature control will decrease and the responsiveness will also decrease. The fuse 11 also had the problem of decreasing responsiveness.

The present invention has been made in consideration of the above-mentioned conventional problems, and an object of the present invention is to provide a fixing device in which the heating roller is not easily damaged and has good fixing performance.

[0008]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a peeling claw, a temperature sensing element, and a fuse on the outer periphery of the heating roller in the same rotation as the pressing part of the cleaning felt pressing spring. At least one of these is arranged.

[0009]

[Operation] In the present invention, in the above structure, first, the cleaning felt removes the toner adhering to the outer surface of the heating roller. Then, toner is less likely to adhere to the peeling claw or the like located on the same rotation as the cleaning felt.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view of a fixing device according to an embodiment of the present invention. Note that the same reference numerals are given to the same constituent members as in the conventional example, and the explanation of the structure will be omitted.

Characteristic configurations of the fixing device of the electronic image forming apparatus of this embodiment include a pressing spring 15 for pressing the cleaning felt 14, a peeling claw 6, a temperature sensing element 10, and a fuse 1.
It is located in the 1st position. That is, on the outer periphery of the heating roller 1, the peeling claw 6 and the temperature measuring element 1 are placed on the same rotation as the pressing part of the pressing spring 15 that presses the cleaning felt 14.
0, all or any fuses 11 are provided.

The operation of the fixing device configured as described above will be explained below.

The paper 16 carrying unfixed toner is fixed by the image forming apparatus by being sandwiched between the heating roller 1 and the pressure roller 3. At this time, a considerable amount of toner is attached to the surface of the heating roller 1. It ends up. This heating roller 1
The toner adhering to the surface of the cleaning felt 14
removed by At this time, the peeling claw 6, the temperature measuring element 1
0. The fuse 11 is on the same rotation as the pressing part of the cleaning felt pressing spring 15 on the outer periphery of the heating roller 1, and the toner is efficiently removed by the pressing part of the cleaning felt pressing spring 15, and the toner is removed by the peeling claw disposed later. 6
, the temperature sensor 10, and the fuse 11 are less likely to have toner attached to them.

Note that the temperature measuring element 10 and the fuse 11
In some cases, a non-contact type heating roller 1 is adopted as the heating roller 1, but the non-contact type has poor thermal response and may cause the fuse to blow even during normal use.

In the fixing device of the electronic image forming apparatus of this embodiment, a peeling claw 6, a temperature measuring element 10, and a fuse 11 are located in a portion of a horizontally long heating roller 1 where toner has been cleaned by a cleaning felt 14. Therefore, toner is less likely to adhere to these peeling claws 6, temperature sensing element 10, and fuse 11.

[0016]

Effects of the Invention As is clear from the description of the above embodiments, the present invention has a configuration in which a peeling claw, a temperature sensing element, and a fuse are arranged on the same rotation as the pressing part of the cleaning felt pressing spring on the outer periphery of the heating roller. , it can significantly reduce toner adhesion to the peeling claw, temperature sensor, and fuse, and it also eliminates the problem of scratches on the heating roller due to toner adhering to each of the above components, and controls the surface temperature of the heating roller using the temperature sensor. This is a very excellent fixing device that can significantly reduce the problems associated with heat transfer and the reduction in thermal response of fuses.

[Brief explanation of drawings]

FIG. 1 is a plan view of a fixing device of an electronic image forming apparatus according to an example of the present invention.

[Fig. 2] A plan view of a fixing device of a conventional electronic image forming apparatus.

[
Figure 3: Same side view

[Explanation of symbols]

1 Heating roller 2 Heating element 3 Pressure roller 6 Peeling nails 10 Temperature measuring element 11 Fuse 14 Cleaning felt 15 Pressure spring

Claims (1)

[Claims] 1. A heating roller having a heating element, a pressure roller in pressure contact with the heating roller, a peeling claw in contact with the heating roller for peeling paper, and a surface temperature of the heating roller is controlled. temperature sensor, fuse,
The heating roller includes a cleaning felt for removing toner stains on the surface of the heating roller, and a pressing spring for pressing the cleaning felt.A peeling claw is provided on the outer periphery of the heating roller on the same rotation of the pressing part of the pressing spring. ，
A fixing device of an electronic image forming apparatus in which at least one of a temperature measuring element and a fuse is arranged.