Photographic processing roller having a surface roughened by electric discharge machining
US4147425A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 1978 |
| Grant date | Apr 3, 1979 |
| Priority date | — |
| Expiry date | May 1, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23H9/04
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An improved cylindrical processing roller is provided for use in a motor driven photographic processing apparatus of the type which spreads a fluid processing composition in a thin, substantially uniform layer between selected layers of integral type self-processable film units while advancing a film unit to the exterior of a camera after photoexposure. The improvement in the roller resides in a novel circumferential roller surface roughened by electrical discharge machining techniques to provide the roller with a high-friction characteristic for transporting the film units while being insufficiently rough to leave any visually perceptible marks on a film unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.