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Powder detection device and toner replenishment device

A technology for detecting devices and toners, which can be used in instruments, equipment for electric recording technology using charge patterns, optics, etc., and can solve problems such as false detection

Active Publication Date: 2017-10-31
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the toner is fixedly adhered to the detection surface, there is a possibility that it may be falsely detected as having toner even though there is no toner

Method used

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  • Powder detection device and toner replenishment device
  • Powder detection device and toner replenishment device
  • Powder detection device and toner replenishment device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0021] The powder detection device of the present invention is embodied, for example, as a toner detection device for detecting toner used in electrophotographic image forming processing. The toner detection device of the first embodiment of the present invention is applied to the image forming apparatus 1 .

[0022] like figure 1 As shown, the image forming apparatus 1 includes: a photoreceptor drum 2, a charging device 3, an exposure device 4, a developing device 5, a transfer device 6, a cleaning unit 7, a fixing device 8, a paper feed tray 9, a paper discharge tray 10, and a control unit. Section 11.

[0023] The photosensitive drum 2 is an example of an electrostatic latent image carrier, has a photosensitive layer on its peripheral surface, and rotates in one direction. The charging device 3 charges the peripheral surface of the photoreceptor drum 2 to a predetermined potential. The exposure device 4 forms an electrostatic latent image by exposing the peripheral surfa...

no. 2 approach

[0058] When the presence or absence of toner is detected by the optical sensors 53 and 54, it is preferable to perform the following process. In the process of supplying toner from the toner cartridge 30 to the hopper 40 and in the process of replenishing the toner from the hopper 40 to the developing tank 21, the presence or absence of toner at a predetermined height in the hopper container 42 is repeated. determination. Then, the cleaning member 55 and the agitating member 43 are rotated next while the toner is being supplied from the toner cartridge 30 to the hopper 40 and while the toner is being replenished from the hopper 40 to the developing tank 21 .

[0059] like Figure 9 As shown, the control unit 11 first resets the sampling frequency SC of the output value of the optical sensor 54 (S1). Moreover, the control part 11 also resets the light-shielding counter IC which is the number of times of sampling the output value which shows the light-shielding state of the op...

no. 3 approach

[0072] Such as Figure 10 as well as Figure 11 As shown, the operation of supplying the toner from the toner cartridge 30 to the hopper 40 is preferably performed as follows. That is, when the control unit 11 stops the cleaning member 55, it is preferable to stop the cleaning member 55 after a predetermined period of time has elapsed from the time when the light path from the optical sensors 53 and 54 is blocked. The timing at which the transmission period of the optical path to the optical sensors 53 and 54 has changed. Specifically, processing is performed as follows.

[0073] When the control unit 11 determines that the toner is not accommodated up to a predetermined height in the hopper container 42, it requests to start replenishing the toner from the toner cartridge 30 to the hopper 40 (S21), and starts to drive the cleaning member 55 to rotate. The motor 556 of the hopper 40 and the motor which rotates the supply roller 31 (S22). Accordingly, an amount of toner cor...

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PUM

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Abstract

The invention relates to a powder detection device and a toner replenishment device. The powder detection device includes sensor cases, optical sensors, a cleaning member, a motor, and a control unit. The sensor cases include detection surfaces and are placed on wall surfaces of a hopper container. The optical sensors are housed in the sensor cases and detect presence or absence of toner at a specified elevation through the detection surfaces. The cleaning member slides and rubs on the detection surfaces. The motor moves the cleaning member. In case where the cleaning member is to be stopped, the control unit controls the motor so as to stop the cleaning member in a region in which the cleaning member does not come into contact with the detection surfaces.

Description

technical field [0001] The present invention relates to a powder detection device for detecting powder such as toner, and a toner replenishing device including the powder detection device. Background technique [0002] In an electrophotographic image forming apparatus, toner is supplied from a developing tank to an electrostatic latent image formed on an electrostatic latent image carrier, whereby the electrostatic latent image is visualized as a toner image. Since the toner is consumed when the electrostatic latent image is visualized into a toner image, it is necessary to replenish the toner to the developing tank. The developing device includes a toner replenishing device and a toner cartridge in addition to the developing tank. The developing tank accommodates toner supplied to the latent electrostatic image carrier. The toner cartridge stores replenishing toner, and when the toner stored inside is exhausted, it is replaced with a new toner cartridge filled with toner....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/08
CPCG03G15/0862G03G15/0887G03G2215/0897G03G15/556G03G21/0011
Inventor 丝山元幸
Owner SHARP KK
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