Method for operating sheet pick and feed systems for printing
US6729613B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 2001 |
| Grant date | May 4, 2004 |
| Priority date | — |
| Expiry date | Jun 15, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J13/0018
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
One method operates a pick motor and a separate feed motor to pick and feed a sheet for printing. Desired pick and feed motor velocities are obtained from respective first and second functions of sheet position. Sheet position for obtaining both desired motor velocities is determined by the pick system until a predetermined event. The feed-system sheet position is synchronized to the pick-system sheet position upon the happening of the event. Sheet position for obtaining both desired motor velocities is determined by the feed system after the event. Another method operates a printer pick motor and includes starting picking by driving the pick motor in a first direction, to move a sheet forward, with an input sufficient to prevent any teetering transitions between peaks and valleys of an encoder sensor output which would be falsely counted as forward motion by a single-channel encoder. A further method operates a printer DC pick motor and includes driving the pick motor with a PWM signal which does not change polarity during picking of a sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.