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Fixing device and temperature control method

An unfixed, device-generating technology, applied in electrographics, optics, instruments, etc., can solve the problems of thermal offset, uneven temperature distribution, abnormal gloss of fixed images, etc., to eliminate excessive heating and uniform temperature distribution. Effect

Inactive Publication Date: 2008-12-10
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, in the fixing device, the temperature of the area where the heating element does not pass through the paper becomes excessively high, the temperature distribution in the width direction of the heating element becomes non-uniform, and when a large-sized paper is passed, the gloss of the fixed image tends to occur. Abnormal and thermal offset (hot offset)

Method used

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  • Fixing device and temperature control method
  • Fixing device and temperature control method
  • Fixing device and temperature control method

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0060] 4 is a schematic cross-sectional view showing the overall structure of an image forming device suitable for mounting the fixing device according to Embodiment 1 of the present invention.

[0061] As shown in FIG. 4, an image generating device 100 has an electrophotographic photosensitive element (hereinafter referred to as "photosensitive drum") 101, a charger 102, a laser beam scanner 103, a developing device 105, a paper feeding device 107, a fixing device 200 and cleaning device 113 etc.

[0062] In FIG. 4 , while the photosensitive drum 101 is rotationally driven in the direction of the arrow at a predetermined peripheral speed, its surface is uniformly charged at a negative predetermined dark potential VO by the charger 102 .

[0063] The laser beam scanner 103 outputs the laser beam 104 modulated according to the time-series electrical digital pixel signal of the image information input from the image reading device not shown in the figure or a host device such as...

Embodiment approach 2

[0130] Next, a fixing device according to Embodiment 2 of the present invention will be described. The fixing device is configured such that the controller controls the excitation device 230 and the cooling device when the controller receives a detection signal detecting that the number of sheets of the small-size paper passing continuously reaches a predetermined number.

[0131] Here, to detect the detection signal that the number of sheets of the small-sized paper passing continuously reaches a predetermined number, for example, on the paper feeding device 107 of the image generating device 100 shown in FIG. A counter (not shown) that counts the number of recording paper 109 outputs to the controller. As the value for the predetermined number of sheets, a value when the temperature of the region that does not pass through the sheet exceeds a predetermined temperature (a temperature set lower than the heat-resistant temperature of the heating belt 210 ) is used in advance ba...

Embodiment approach 3

[0135] Next, a fixing device according to Embodiment 3 of the present invention will be described. The structure of this fixing device is such that its controller continuously passes the paper of the small size paper, and the detection temperature of the temperature detection sensor 260x in the area that does not pass the paper exceeds a prescribed temperature (set higher than the resistance of the heating belt 210). When the heating temperature is low), the excitation device 230 and the cooling device are controlled.

[0136] Figure 13 It is a flowchart showing the operation of the controller of the fixing device according to the third embodiment. exist Figure 13 In this process, if paper passing to the fixing device 200 is started, first, in step ST901, it is judged whether the temperature of the non-passing paper area of ​​the heating belt 210 is higher than a predetermined temperature based on the detection temperature of the non-passing paper area temperature detectio...

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Abstract

A fixing device, wherein the rotary drive system of a heating belt (210) is adopted as a cooling mechanism cooling the overall paper passage area of the heating belt (210) and the heating belt (210) is idled in a paper non-passage state by a rotary cooling system for cooling. An exciting device (230) and the cooling mechanism are controlled to cool the heating belt (210) while heating through a heating width in a case when recording paper (109) of small size is passed without passing the recording paper (109) therethrough until the detection temperature of a paper non-passage area temperature detection sensor (260x) becomes a specified fixing temperature or below. The fixing device (200) can uniformize the temperature distribution of the heating belt (210) in a short time by efficiently eliminating the overheated temperature of the paper non-passage area of the heating belt (210).

Description

technical field [0001] The present invention relates to a fixing device useful for image generating devices such as electrophotography or electrostatic recording copiers, facsimile machines, and printers, and in particular to unfixed images on recording media using electromagnetic induction heating. A fixing device and a temperature control method for heating and fixing. Background technique [0002] In the fixing device of the electromagnetic induction heating (IH, induction heating) method, an eddy current is generated in the heating element by the action of the magnetic field generated by the magnetic field generating unit, and the transfer is performed using the Joule heating of the heating element generated by the eddy current. Heat and fix unfixed images on recording media such as paper and OHP film. Compared with a heat roller type fixing device using a halogen lamp as a heat source, this electromagnetic induction heating type fixing device has the advantages of high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/20
CPCG03G2215/2032
Inventor 安田昭博田岛典幸立松英树马场弘一谷繁满
Owner PANASONIC CORP