Toner replenishing device and image forming apparatus

Abstract

The toner consumption calculating unit (63) of the toner replenishing device (11) calculates the toner consumption using the gradation value of each pixel of the multivalued image input from the image data input unit (62). The calculated toner consumption is corrected by the corrected consumption calculation unit (64), and then integrated by the total consumption calculation unit (65) to calculate the total toner consumption. The main replenishment amount control unit (69) controls the replenishment roller driving motor (71) so as to replenish a predetermined first replenishment amount to the developing tank when the total consumption amount is equal to or greater than the reference consumption amount. In addition, the auxiliary replenishment amount control unit (75) controls the replenishment roller drive motor (71) so that when the toner concentration acquired by the toner concentration acquisition unit (73) is lower than the starting concentration, it starts to replenish the predetermined second amount to the developing tank. Supplementary amount of toner.

Description

technical field [0001] The present invention relates to a toner replenishing device for replenishing toner to a developer storage container of a developing section using two-component development composed of toner and carrier, and an image forming apparatus having the toner replenishing device. agent to develop the electrostatic latent image. Background technique [0002] An electrophotographic image forming apparatus that forms an image by electrophotography is used, for example, as a copying apparatus, a printer, or a facsimile apparatus. An electrophotographic image forming device includes a photosensitive drum, a charging device, an exposure device, a developing device, a transfer device, and a fixing device. [0003] In such an image forming apparatus, an exposure device exposes a photosensitive surface of a photosensitive drum charged by a charging device to form an electrostatic latent image. Then, the formed electrostatic latent image is developed with a two-compon...

AI Technical Summary

Problems solved by technology

[0010] In the technique disclosed in Japanese Patent Application Laid-Open No. 2006-171023, in order to prevent over-supply of toner, the main replenishment is performed based on the corrected consumption amount obtained by multiplying the calculated toner consumption amount by a correction amount less than 1, but If the amount of replenished toner is too small, it will not be possible to maintain the concentration of toner in the developer storage container at the concentration required for development.

There is room for improvement in the technology disclosed in Japanese Patent Application Laid-Open No. 2006-171023

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