Image forming apparatus, toner cartridge and method to...

Details Image forming apparatus, toner cartridge and method to... Image forming apparatus, toner cartridge and method to...

2006-02-28

2008-10-28

Gray, David M (Department: 2852)

Electrophotography

Diagnostics

Consumable

C399S061000, C399S227000

Reexamination Certificate

active

07444089

ABSTRACT:
An image forming apparatus that forms an image according to an electrophotographic system includes plural developing units provided in a cylinder, which freely rotates a fixed angle at a time around a rotation shaft, to rotate together with the cylinder. Toner levels of toner cartridges arranged in the developing units are detected by rotating the cylinder a predetermined angle to stop the cylinder and measuring a flow-down time of a toner, which flows down inside of the toner cartridge, using an optical sensor.

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patent: 2004/0208660 (2004-10-01), Ito et al.
patent: 63-34982 (1988-07-01), None
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patent: 2004-264539 (2004-09-01), None
patent: 2004-354904 (2004-12-01), None

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