Ink jet printing apparatus correctional in drop placement errors
US4551731A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 1983 |
| Grant date | Nov 5, 1985 |
| Priority date | — |
| Expiry date | Aug 8, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/12
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An ink jet array printer has at least one row of printing guns. The guns deposit drops which are charged and deflected for printing on a printing surface moving relatively to the printer in line sections which together form a transverse printing line. The charging of the drops is effected by applying to the charge electrode of each gun, under the control of printing information, a periodic voltage waveform of sufficient period to span a raster of successively formed drops which are employed for printing the corresponding line section, the printing lines being successively formed at the frequency of the voltage waveform. Detector means are provided which sense values representative of drop placement errors of jets of test drops in the direction of relative movement of the printer and printing surface and control means responsive to the sensed values are operative to advance or retard the application to the charge electrode of each printing gun of the periodic voltage waveform thereby to correct for said drop placement errors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.