Differential gear for motor driven photographic system
US5555057A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 18, 1995 |
| Grant date | Sep 10, 1996 |
| Priority date | — |
| Expiry date | May 18, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/268
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A differential gear mechanism for loading, advancing, rewinding and unloading photographic film, and in particular, film in a thrust film cartridge, for a photographic system. The differential gear includes a sun gear, which is rotatable, a planetary gear, which is rotatable by the sun gear, a drive spindle which is rotatable by the planetary gear to advance and rewind photographic film, a carrier plate, which is rotatable by the planetary gear, a drive gear, which is rotatable by the carrier plate for positioning the door of a film cartridge in either the open or closed position, and a torque control lever, for selectively locking or releasing one or both of the drive spindle and/or carrier plate so the planetary gear can selectively rotate one or both of the drive spindle or the carrier plate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.