Flow camera film transport
US4007889A · kind A · utility
4Cited by
2References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 9, 1975 |
| Grant date | Feb 15, 1977 |
| Priority date | — |
| Expiry date | Oct 9, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/587
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A flow camera having film that moves only when an exposure is being made. A three-piece cassette is assembled and coacts with film path rollers for easy threading upon the rotation of a knob. Subsequent rotation of the knob fastens the cassette in place and positions capstan and dancer rollers for defining the operating film path. A double spring determines the egress film tension and a lever-roller combination having mechanical connection to the ingress dancer arm determines the ingress film tension. A fast slow motion is provided by acting upon the mechanical connection between the ingress dancer arm and the ingress film clutch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.