Image forming apparatus which switches from color to monochrome mode with charging and developing bias reduction
US11231659B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 2021 |
| Grant date | Jan 25, 2022 |
| Priority date | — |
| Expiry date | Jan 27, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0119
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In response to determining that image forming in a color mode is performed on a first sheet and then image forming in a monochrome mode is successively performed on the second sheet, perform charging bias reduction processing gradually reducing a charging bias from first to second charging bias and developing bias reduction processing of gradually reducing a developing bias from first to second developing bias during a first inter-sheet period after the first sheet passes a first photosensitive drum and before the second sheet reaches the first photosensitive drum, and perform separation processing such that an execution period of the separation processing overlaps at least one of an execution period of the charging bias reduction processing and an execution period of the developing bias reduction processing, the separation processing being processing of controlling a moving mechanism to move a first developing roller from a contact position to a separation position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.