Image forming apparatus and conveyance malfunction decision method
US7957687B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 7, 2007 |
| Grant date | Jun 7, 2011 |
| Priority date | — |
| Expiry date | May 6, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00734
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Preventing a paper jam as much as possible when actual paper size differs from designated paper size with increasing throughput by starting conveyance of a second sheet before detecting the length of a first sheet. Unless a register sensor has detected the rear edge (step S303), start of feeding the next sheet is checked (step S304). If started, a prescribed value 1 is applied (step S305). If not started, a prescribed value 2 is applied (step S306). Unless the rear edge is detected before a timer measures “estimated time+prescribed value” (step S307), a paper jam decision is made (step S308). If the rear edge is detected before the timer measures the “estimated time+prescribed value” (step S303), the processing is completed without making a paper jam decision. Making the prescribed value 1 less than the prescribed value 2 enables reducing the paper jam caused by incorrect setting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.