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Image forming apparatus and image forming method

An image and toner technology, applied in the field of image forming devices, can solve problems such as damage to the surface of the fixing roller

Active Publication Date: 2022-04-22
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of printing with toner using crystalline polyester, the surface of the fixing roller may be damaged by the toner

Method used

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  • Image forming apparatus and image forming method
  • Image forming apparatus and image forming method
  • Image forming apparatus and image forming method

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0024] First, the mechanism of damage that occurs on the fuser is described when printing with a tonal agent of crystalline polyester. The present inventors have found that, in the use of crystalline polyester tonal agent, attached to the thermistor of the tonal agent, since the fuser is heated for a long time near the fuser temperature, the thermal characteristics of the tonal agent changes. In the usual printing action (the state of fixing to the recording paper), the tonal agent attached to the thermistor, accumulated in the thermistor repeatedly attaches to the thermistor and detaches from the thermistor, in the case of no printing action theizer in the case of long standby near the fuser temperature, the tonal agent accumulated in the thermistor is heated for a long time by the fuser. In this case, the thermal properties of the tint accumulated in the thermistor are irreversibly hardened in a high viscosity direction compared to the usual tonal agent. Due to this hardening ph...

no. 2 approach

[0068] Next, the image forming apparatus 100 in the second embodiment is illustrated. The tonic agent used in this embodiment is the above-described tonal agent A. The standby temperature is reduced compared to the fuser temperature this point is the same as the first embodiment. Figure 7 Is a functional block diagram of the image forming apparatus 100 for fixing the functional structure of the second embodiment. Image forming apparatus 100, comprising a control unit 150a instead of a control unit 150 in this regard is different from the first embodiment, other structures are the same as the first embodiment. The following points based on the drawings illustrate different from the first embodiment.

[0069] The control unit 150a controls the action of each part of the image forming apparatus 100. Control unit 150a is executed, for example, by a device comprising a CPU and RAM. The control unit 150a by executing the image formation program, as the image formation control unit 151, ...

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Abstract

The present invention provides an image forming apparatus and an image forming method capable of forming an image with fewer defects. The image forming apparatus according to an embodiment includes a printing unit, a fixing unit, a temperature sensor, and a temperature control unit. The viscosity of the printing part becomes 1.0 (10 5 In the case of Pa.s), the toner whose heating temperature difference is in the range of 30° C. to 60° C. performs image formation. The fuser heats and fuses the toner. The temperature sensor measures the surface temperature of the fuser. The temperature control unit controls the surface temperature of the fixing unit and also controls the standby temperature of the fixing unit to be 10° C. to 60° C. lower than the fixing temperature of the toner formed by the printing unit.

Description

Technical field [0001] Embodiments of the present invention relates to an image forming apparatus and an image forming method. Background [0002] Low melting point tonants using crystalline polyester have the characteristics of rapid thermal melting for fixing devices, etc. Thus, it is known that by applying a low melting point toning agent using a crystalline polyester resin, the method of achieving low-temperature fixing of the sheet is effective. [0003] In fusing devices, in order to control the temperature of the fusing device, most contact thermistors (hereinafter referred to as "thermistors") are used. The thermistor is in contact with the heating roller of the fuser device 34, and the temperature is measured. Therefore, the tonal agent attached to the heating roller after the fusing treatment is also attached to the thermistor as a contact part. The usual thermogenic tonal agent, even if attached to the thermistor, hardens and detaches from the thermistor through natur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/20G03G9/08
CPCG03G9/0821G03G15/205G03G15/2039G03G15/2064
Inventor 阿嶋久延
Owner KK TOSHIBA