Endless-moving-member driving unit, image forming apparatus, photosensitive-element driving unit, and method of degradation process for endless moving-member
US7174237B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 2004 |
| Grant date | Feb 6, 2007 |
| Priority date | — |
| Expiry date | Apr 21, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0119
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A scale having marks disposed at a predetermined interval is provided on an intermediate transfer belt. A sensor detects the scale and outputs a binary signal. A counter counts a wave number of the binary signal. The wave number of the binary signal detected when the sensor detects a normal scale within a predetermined time is stored in a memory. A difference between the wave number stored and a wave number counted within a same period of time as the predetermined time is greater than a predetermined value, degradation of the scale and a change in a control of speed of the intermediate transfer belt into a control by a dummy signal is displayed on a display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.