Web of record members and method of and apparatus for making same and system for detecting indicia
US5760414A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 19, 1995 |
| Grant date | Jun 2, 1998 |
| Priority date | — |
| Expiry date | Dec 19, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24273
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
There is disclosed a web of record members of the composite label web, tag and linerless types with cracks or fissures through the webs so that the position of the web can be detected by an optical detector. Apparatus can be used to convert the web into more usable form which includes for provision of optically detectable cracks or fissures in the web. These cracks are made by crushing the web locally between one or more crushing cutters and a back-up roll which cooperates with zero clearance. The method and apparatus can produce a reliably detectable web at low cost. The optical detector includes a source of light and a bicell detector between which the web with the cracks or fissures passes. The bicell detector produces a first output signal representing the amount of light impinging on a first portion of the detector and a second output signal representing the amount of light impinging on a second portion of the detector. A difference circuit is coupled to the bicell detector to provide a signal representing the difference between the first and second output signals of the bicell detector. From this difference signal the leading and trailing edges of a crack or fissure can be de…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.