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Image-forming apparatus

A kind of equipment and imaging technology, which is applied in the direction of equipment, instruments, optics, etc. of the electrical recording process using charge patterns, and can solve problems such as heater out of control temperature, wrong fixing device, etc.

Inactive Publication Date: 2003-03-26
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Failure of control components caused by excessive noise, etc. can cause the heater to "run away" or overheat
In addition, the control section sometimes detects an abnormally high temperature due to the timing at which the power of the apparatus is turned off and then turned on after finding a real abnormally high temperature, and thus erroneously determines that the fixing device is in an abnormal state
When a fixing unit abnormality such as the above occurs, maintenance personnel are requested to intervene even if there is no malfunction in the equipment

Method used

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Examples

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Embodiment Construction

[0015] Preferred embodiments of the present invention are described below with reference to the accompanying drawings.

[0016] First refer to figure 1 The structure of an electrophotographic laser printer as an example of the image forming apparatus of the present invention will be described. The printer mainly includes a control panel unit 1 , a scanning unit 2 , an image forming unit 3 , a paper feeding unit 4 , a fixing device 5 , a paper output unit 6 (transfer tray) and a control unit 10 . A laser beam projected from a semiconductor laser as a light source in the scanning section 2 is deflected by a rotary polygon mirror. While being deflected, the laser beam is projected onto the photosensitive drum in the image forming member 3, that is, the outer surface of the latent electrostatic image bearing member, in such a manner as to scan the outer surface. As a result, an electrostatic latent image is formed on the outer surface of the photosensitive drum. Before the elec...

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PUM

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Abstract

An image forming apparatus includes image forming means for forming an image on a recording material; fixing means for heating and fixing the image on the recording material, said fixing means having a heater for generating heat upon electric energy, supply thereto and a temperature detecting element for detecting a temperature; abnormality detecting means for discriminating an abnormality of said fixing means on the basis of an output of said temperature detecting means; shutting means for shutting electric energy supply to said heater; storing means for storing an event of discrimination of the abnormality; and erasing means for erasing abnormality data stored in said storing means, when said fixing means starts up normally upon electric power supply to said apparatus.

Description

technical field [0001] Field of the Invention The present invention relates to image forming apparatuses such as electronic imaging apparatuses, electrostatic recording apparatuses, etc., and more particularly to image forming apparatuses including fixing means for fixing a developer such as toner to recording paper. Background technique [0002] In the field of image forming apparatuses using electrophotography or electrostatic recording methods such as copying apparatuses, printers, etc., an unfixed image formed on a recording medium such as paper is generally thermally fixed to the recording medium using a fixing device. [0003] A fixing device used for the above purpose generally includes a heat roller and a pressure roller as heat fixing members. The heat roller contains a heater inside. The pressure roller rotates and maintains contact with the heat roller, with a predetermined amount of pressure applied. In order for an image forming apparatus to have excellent fus...

Claims

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Application Information

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IPC IPC(8): G03G21/00G03G15/20G03G21/14
CPCG03G15/2003G03G15/205G03G15/5004
Inventor 高山裕史
Owner CANON KK
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