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Fixing device and image forming apparatus

An image and fixing roller technology, applied in the direction of electric recording process applying charge pattern, equipment for applying electric recording process of charge pattern, electric recording technique, etc. Widening the separation claws and other problems to achieve the effect of increasing the contact area, suppressing the deterioration of the image, and reducing the contact pressure

Inactive Publication Date: 2009-04-08
KYOCERA DOCUMENT SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the contact pressure of the separation claw to the fixing roller is concentrated on the contact portion, the effect of widening the width of the front end of the separation claw cannot be sufficiently obtained, and there is still a disadvantage that it is difficult to sufficiently suppress the wear of the fixing roller.
In this way, streaks are formed on the image due to the wear marks of the fixing roller, and there is a problem that the image is significantly deteriorated especially in a color image forming apparatus.

Method used

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  • Fixing device and image forming apparatus
  • Fixing device and image forming apparatus
  • Fixing device and image forming apparatus

Examples

Experimental program
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no. 1 Embodiment approach

[0027] 1 is a front sectional view showing the overall configuration of a printer 1 including a fixing device 20 according to an embodiment of the present invention, and FIG. 2 is a front view for explaining the configuration of the fixing device 20 shown in FIG. 1 . also, Figure 3 ~ Figure 7 It is a diagram for explaining the structure of the separating mechanism of the fixing device 20 shown in FIG. 2 . First, an overall configuration of a printer 1 including a fixing device 20 according to an embodiment of the present invention will be described with reference to FIG. 1 .

[0028] As shown in FIG. 1 , in this printer 1 , a printer body 2 includes developing devices 3 for the respective colors of cyan (C), magenta (M), yellow (Y), and black (B). In each developing device 3, there is a photosensitive drum 4 made of a-Si (amorphous silicon) or the like, which rotates in the direction of the arrow in the figure.

[0029] This photosensitive drum 4 is uniformly charged by a c...

no. 2 Embodiment approach

[0066] Next, a second embodiment of the present invention will be described. FIG. 8 is a front view illustrating an embodiment in which another fixing device 20A is mounted on the printer 1 shown in FIG. 1 . also, Figure 9 ˜ FIG. 13 are diagrams for explaining the structure of the separation mechanism of the fixing device 20A shown in FIG. 8 .

[0067] As shown in FIG. 8 , a fixing device 20A according to the second embodiment has a fixing (heating) roller 141 capable of generating heat in a housing 30A as the main body of the device, and a fixing roller 141 disposed below the fixing roller 141 and on the peripheral surface of the fixing roller 141. The pressure (pressure) roller 142 facing between. The paper P (see FIG. 1 ) after the transfer process passes through the nip area between the fixing roller 141 driven to rotate clockwise and the pressure roller 142 driven to rotate counterclockwise, and heat is applied by the fixing roller 141 to perform fixing treatment.

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Abstract

This invention provides a fixing device and image forming apparatus. A fixing device is provided with a fixing roller for fixing a toner image transferred on a sheet to the sheet, and a separating mechanism for separating the sheet from the fixing roller. The separating mechanism includes a claw member having a tip portion held in contact with the outer circumferential surface of the fixing roller for separating the sheet from the fixing roller, a supporting member pivotably supporting the claw member, and a biasing member for biasing the claw member toward the outer circumferential surface of the fixing roller so that the tip portion of the claw member presses the fixing roller. Thereby, the claw member can contact circumferential surface of the fixing roller with even pressure all the time and can prevent abrasion adequately.

Description

technical field [0001] The present invention relates to a fixing device for fixing a toner image transferred onto paper, and an image forming apparatus using the fixing device. Background technique [0002] In the fixing device used in image forming devices such as printers and copiers to fix the toner image transferred to the paper on the paper, an elastic layer is provided on the pressure (pressure) roller and the fixing (heat) roller (rubber layer) uses the shape of the nip between the pressure roller and the fixing roller to separate the paper from the peripheral surface of the fixing roller, and a fixing device using such a separating method is known. [0003] However, when an elastic layer is provided on the fixing roller, due to the low thermal conductivity of the elastic layer, there will be disadvantages such as poor temperature followability during continuous paper feeding and increased heating and heating time, and it is difficult to fully cope with the current tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/20G03G15/00
Inventor 中野邦昭金松良治内田进一
Owner KYOCERA DOCUMENT SOLUTIONS INC