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Image Forming Apparatus

An image and toner image technology, applied in the field of image forming devices, can solve problems such as false detection, and achieve the effect of suppressing abnormal false detection

Inactive Publication Date: 2015-08-26
KYOCERA DOCUMENT SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Therefore, as described above, in the configuration in which the temperature control of the fixing device is performed by switching a plurality of temperature control methods including the above-mentioned PID control method, when temperature control is performed by a plurality of temperature control methods, if the above-mentioned common appropriate range is used as a reference Detecting abnormality of the fixing device may cause false detection

Method used

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Examples

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Embodiment Construction

[0022] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the embodiment described below is only an example of actualizing the present invention, and does not limit the technical scope of the present invention.

[0023] First, the schematic configuration of the image forming apparatus 1 according to the embodiment of the present invention will be described. The image forming apparatus 1 is a digital multifunction peripheral including an image reading function, a facsimile function, an image forming function, and the like. like figure 1 As shown, an image forming apparatus 1 includes an image reading unit 2 , a document cover 3 , an automatic document feeder ADF (Auto Document Feeder) 4 , an image forming unit 5 , and a paper feeding cassette 6 . In addition, the image forming apparatus 1 as a digital multifunction machine is described as an example of the image forming apparatus of the present invention, but the p...

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Abstract

In an image forming apparatus, a first abnormality detection portion detects an abnormality in a fixing portion based on a change rate of a temperature detected by a temperature detecting portion and a first reference change rate that is set in advance. A first temperature control portion performs a temperature control of a heat source by a first feedback control method based on the temperature detected by the temperature detecting portion. A second temperature control portion performs a temperature control of the heat source by a second feedback control method based on the temperature detected by the temperature detecting portion, the second feedback control method being smaller in temperature change rate than the first feedback control method. A detection prohibiting portion prohibits the abnormality detection by the first abnormality detection portion during the temperature control performed by the second temperature control portion.

Description

technical field [0001] The present invention relates to an image forming apparatus including a fixing device for fixing a sheet on which a toner image is formed. Background technique [0002] Conventionally, image forming apparatuses such as copiers, printers, and facsimile machines equipped with electrophotographic image forming units, and digital multifunction peripherals equipped with these functions are provided with fixing devices. The fixing device includes: a fixing roller whose surface is heated by a heat source; and a pressure roller that is in pressure contact with the fixing roller and is rotatable. When the sheet on which the toner image is formed on the surface passes through the fixing device, the sheet is held between a pressure roller and a fixing roller at a predetermined pressure and heated. Thereby, the toner is melted and fixed on the sheet, and the toner image is fixed on the sheet. [0003] Usually, the heat source included in the fixing device is con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/20G03G15/00
CPCG03G15/205G03G15/55
Inventor 田野中睦
Owner KYOCERA DOCUMENT SOLUTIONS INC