Toner replenishment device for an image forming apparatus which

Details Toner replenishment device for an image forming apparatus which Toner replenishment device for an image forming apparatus which

1996-03-05

1998-01-13

Pendegrass, Joan H.

Electrophotography

Control of electrophotography process

Control of developing

399 42, 399 44, 399 60, G03G 1508

Patent

active

057089175

ABSTRACT:
The image forming apparatus is provided with a detecting means for detecting transfer efficiency when transferring a toner image from a photosensitive member to a transfer sheet, and a developing efficiency changing means for changing developing efficiency based on the transfer efficiency detected by the detecting means, and corrects the toner consumption predicted by the predicting means based on the transfer efficiency as detected by the detecting means, so as to determine the amount of toner to be replenished. When the developing efficiency is changed based on the transfer efficiency, toner consumption also changes, and does not match the predicted toner consumption. According to the present invention, toner concentration in a developer can be even more accurately controlled by correcting the predicted toner consumption by the change in transfer efficiency. Detection of transfer efficiency is achieved by a method of indirectly detecting humidity in the apparatus, or a method of measuring the amount of toner transferred to a transfer member.

REFERENCES:
patent: 5146274 (1992-09-01), Hattori et al.
patent: 5202769 (1993-04-01), Suzuki
patent: 5204718 (1993-04-01), Morita

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