Image forming apparatus capable of calculating deterioration quantity of photosensitive drum based on the number of rotations in contact and separation states
US11640133B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 2021 |
| Grant date | May 2, 2023 |
| Priority date | — |
| Expiry date | Aug 30, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2221/183
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus includes: a photosensitive drum; a developing roller; a separation mechanism configured to switch a state of the photosensitive drum and the developing roller between a contact state and a separation state; a main memory storing therein a first rotation number and a second rotation number; and a controller configured to perform calculating a deterioration quantity of the photosensitive drum based on the first rotation number and the second rotation number in the main memory. A surface of the developing roller contacts a surface of the photosensitive drum in the contact state, whereas the surface of the developing roller is separated from the surface of the photosensitive drum in the separation state. The first rotation number is the number of rotations of the photosensitive drum in the contact state, and the second rotation number is the number of rotations of the photosensitive drum in the separation state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.