Franking machine with means for checking operation of printing elements
US5321436A · kind A · utility
23Cited by
10References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 30, 1992 |
| Grant date | Jun 14, 1994 |
| Priority date | — |
| Expiry date | Nov 30, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07B2017/00556
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A franking machine in which the franking impression is printed by means of an ink jet print head. In order to determine whether all the ink jet nozzles are functional all of the nozzles are operated in selected ones of a series of print cycles to print a bar code. Reading means is provided to read a part of the bar code printed by a group of the nozzles and the information read is compared with information intended to be represented by the bar code. For successive printings of the bar code, the reading means is shifted transversely so that over a series of bar codes all the nozzles are checked.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.