Sheet length measuring device and image forming apparatus
US8800160B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 2012 |
| Grant date | Aug 12, 2014 |
| Priority date | — |
| Expiry date | Feb 1, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00734
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sheet length measuring device includes a rotating body configured to rotate with a movement of a sheet in a conveying direction; a position detecting unit configured to detect leading and trailing ends of the sheet passing through a position of the rotating body; a measuring unit configured to measure a rotation amount of the rotating body and output an origin signal per one revolution of the rotating body; a storage unit configured to store changes of a sheet conveying amount with respect to respective rotation angles in one revolution of the rotating body; and a calculating unit configured to calculate a corrected length of the sheet from a value obtained from a rotation angle of the rotating body when the leading end of the sheet is detected and a value obtained from a rotation angle of the rotating body when the trailing end of the sheet is detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.