Obstructed-field-indicia-sensing device
US4835720A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1986 |
| Grant date | May 30, 1989 |
| Priority date | — |
| Expiry date | Mar 11, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/14
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An apparatus for monitoring the phasing relationship of a moving web of material of the type having a repeating series of graphics patterns thereon which repeat at ordinarily constant distance repeat length intervals of web travel and which contain separate repeating indicia portions which define a repeating indicia set which are positioned in a repeating indicia path extending longitudinally of the web comprising: an indicia detection device for providing an indicia detection pulse signal; a web travel sensing device for providing a web movement signal; an indicia profiling device for processing the indicia pulse signal and the web monitoring signal for generating a unique indicia image for each of the repeating indicia in a selected repeat length portion of the web; an indicia image storage device for identifying and storing the indicia images from a first selected repeat length portion of the web; a register indicia designation device for initially designating one of the repeating indicia to be register indicia; a register indicia sensing device for providing a register indicia pulse signal having pulses which in normal operation corresponds to the detection of the selected regi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.