Method for controlling line printers comprising a revolving type band and a print hammer bank
US4764039A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 8, 1986 |
| Grant date | Aug 16, 1988 |
| Priority date | — |
| Expiry date | Sep 8, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J9/44
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Method for controlling line printers comprising a revolving type band (400) and a print hammer bank for precalculating the firing times of the print hammers. The type band generally comprises equidistantly spaced scannable time marks (402) and a reference mark (501). The character spacing on the type band is subject to a coarse raster pitch .DELTA.T which is derived from the time mark pitch. The time mark positions are associated with coarse raster positions. The arrangement of the print hammers is subject to a coarse raster pitch .DELTA.T and a fine raster pitch .DELTA.T. Coarse and fine raster values are defined as time values. The hammers are sorted according to the fine raster values and their firing times are calculated by means of a special algorithm according to the order resulting from the sort step. The calculated values are entered in a first table (600) (comprising a field for each coarse raster value) and in a second table (700) (in which the fine raster values associated with the coarse raster value are entered). The printer control method permits PA0 different character spacings on the type band and variable print hammer pitches, PA0 compensating for flight time varia…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.