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Fixing device, method for adjusting gap width thereof, and image forming device

A technology of gap width and adjustment method, which is applied in the direction of electric recording process applying charge pattern, equipment and instrument of electric recording process applying charge pattern, etc., can solve the problems of accelerated deterioration and heating of the annular belt

Active Publication Date: 2021-06-22
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in this case, the area of ​​the endless belt that is in contact with the heat-generating parts is overheated, and the deterioration speed of the endless belt may be accelerated.

Method used

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  • Fixing device, method for adjusting gap width thereof, and image forming device
  • Fixing device, method for adjusting gap width thereof, and image forming device
  • Fixing device, method for adjusting gap width thereof, and image forming device

Examples

Experimental program
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Effect test

no. 1 approach

[0018] figure 1 It is a schematic diagram of the image forming apparatus of the embodiment. The image forming apparatus 1 has a reading unit R, an image forming unit P, and a paper cassette unit C. As shown in FIG. The reading unit reads a document sheet placed on a document table with a CCD (Charge-Coupled Device) image sensor or the like, and converts an optical signal into digital data. The image forming unit P is a unit that acquires print data from a document image read by the reading unit R or an external personal computer, and forms and fixes a toner image on a sheet.

[0019] The image forming unit P includes a laser scanning unit 200 and photosensitive drums 201Y, 201M, 201C, and 201K. The laser scanning unit 200 has a polygon mirror 208 and an optical system 241, and irradiates an image formed on a sheet onto a photoreceptor based on image signals of yellow (Y), magenta (M), cyan (C), and black (K). Drums 201Y-201K.

[0020] The photosensitive drums 201Y to 201K ...

no. 2 approach

[0065] In the second embodiment, an example in which the configuration of the fixing device is changed from that of the first embodiment will be described. Figure 8 It is a diagram showing a configuration example of the fixing device 30A.

[0066] The film guide 36 has a semi-cylindrical shape, and accommodates the heating member 32 in a concave portion 361 on the outer peripheral surface.

[0067] The fixing film 34A (belt) is an endless (endless) rotating belt. The fixing film 34A is fitted on the outer peripheral surface of the film guide 36 . The fixing film 34A is sandwiched between the film guide 36 and the pressure roller 31 , and driven by the rotation of the pressure roller 31 .

[0068] The heating member 32 described above is in contact with the fixing film 34A, and heats the fixing film 34A.

[0069] The sheet 105 on which the toner image is formed is conveyed between the fixing film 34A and the pressure roller 31 . The fixing film 34A heats the sheet to fix t...

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PUM

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Abstract

The invention relates to a fixing device, a method for adjusting the gap width thereof, and an image forming device. In general, a fixing device according to an embodiment includes an endless belt, a pressure body, a heating member, an adjustment mechanism, and a control unit. The pressing body conveys the sheet while pinching the sheet together with the endless belt. The heating component is arranged inside the endless belt and has a heating element for heating the endless belt. The adjusting mechanism moves at least one of the heating member and the pressing body in a direction of separating from the other and in a direction of approaching the other, and adjusts the length of the nipping area formed by the heating member and the heating body and nipping the endless belt in the sheet conveying direction. , that is, the gap width. The controller controls the adjustment mechanism so that A is the gap width during the fixing process of heating the sheet to fix the color material to the sheet, and B is the gap width during the temperature raising process of the heating member performed before the fixing process. When N is the length of the heating element in the sheet conveying direction, A>B≧N.

Description

technical field [0001] The embodiments described in this specification relate to a technique for fixing a toner image formed on a sheet to the sheet. Background technique [0002] Conventionally, there is known a fixing device that heats a sheet using a plate-shaped heat generating member. This fixing device is configured such that the plate-shaped heat generating member and the pressure roller face each other. In this fixing device, a plate-shaped heat generating member contacts the inner surface of the endless belt, and the opposite surface of the endless belt contacts the first surface of the sheet, thereby heating the sheet through the endless belt. In addition, in this fixing device, pressure is applied by a plate-shaped heat generating member and a pressure roller by contacting the pressure roller with the second surface of the sheet. Thus, the fixing device fixes the toner image transferred onto the sheet onto the sheet. [0003] Although the endless belt is in con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/20
CPCG03G15/2017G03G15/2032G03G15/2028G03G15/2039G03G15/2064G03G21/14G03G21/1685G03G2215/2038G03G2215/2045
Inventor 菊地和彦高木修宫内智绘
Owner KK TOSHIBA