Apparatus for treating webs of photographic material or the like
US3948125A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1973 |
| Grant date | Apr 6, 1976 |
| Priority date | — |
| Expiry date | Sep 20, 1993 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T83/531
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Apparatus for subdividing webs of photographic paper into discrete prints has a detector which scans marks applied to the web for the purpose of arresting the drive for the web at the exact moment when the central portion of a frame line between two successive images on the web is in register with the knives. The signals which are furnished by the detector can be used to arrest the drive only within a short interval of time which begins shortly or immediately before a mark reaches the detector. This prevents the detector from arresting the drive in response to detection of a flaw or a particle of foreign matter whose effect upon the detector is similar to that of a mark.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.