Paper feeding control apparatus and method for printers
US5297871A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 29, 1991 |
| Grant date | Mar 29, 1994 |
| Priority date | — |
| Expiry date | Nov 29, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/505
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A vertical forms control apparatus for a printer, and a printing method, which corrects dot pitch errors in the subscanning direction. A paper feeding control apparatus is provided with a print head scanned in a direction of paper width and having a plurality (N) of dot forming elements aligned with a dot pitch (P) in a direction in which the paper is advanced, a pulse motor connected to a paper advancing mechanism via a transmission such that the pulse motor requires a plurality of steps to make a rotation corresponding to the dot pitch (P), and a microcomputer for outputting drive pulses to the pulse motor 1, the drive pulses indicating the number-of-steps-for-an-advancement-of-one-line (P.times.N) plus correction steps. In printing across a plurality of lines with the lines connected together, if blank spaces or overlaps are developed, pulses in a number required for rotating the pulse motor in an amount corresponding to the width of the blank spaces or overlaps are added to or subtracted from a standard value so that the pulse motor undergoes a correct amount of rotation for each line. By this arrangement, errors between lines due to machining errors of parts can be corrected s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.