Printing head inspecting device and method for printer
US6412902B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 2001 |
| Grant date | Jul 2, 2002 |
| Priority date | — |
| Expiry date | Jun 22, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J15/005
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An ink jet printer includes an ink jet printing head, having plural recording elements arranged in a main scan direction. Feeder roller sets move continuous recording sheet relative to the printing head in a sub scan direction, to print an image to the continuous recording sheet. A printing head inspecting device for the printer is provided. A controller causes the feeder roller set to set first and second line positions of the continuous recording sheet sequentially at the printing head. While one of the first and second line positions is set at the printing head, the controller simultaneously drives recording elements in one of first and second groups into which the recording elements are grouped in the printing head, to print one check dot train to the continuous recording sheet. Thus, two check dot trains are printed in the first and second line positions. Each of the first and second groups includes plural recording elements intermittently arranged in the printing head. An inspection sensor detects the two check dot trains, to inspect whether the recording elements print at intended density.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.