Film changer for X-ray apparatus
US4234796A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 1979 |
| Grant date | Nov 18, 1980 |
| Priority date | — |
| Expiry date | Jun 21, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B42/021
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A film changer especially for X-ray diagnostic apparatus permitting exposure at rapid frame rates. The film changer includes a supply magazine holding a stack of sheet film, a transfer device for transferring a sheet of film into an exposure station including a fixed and a movable pressure plate covered on the adjacent faces by intensifying screens, and an ejection device for ejecting exposed films into a receiver magazine. The displacements of the movable plate to and from the fixed one are controlled by means of two pairs of cams rotating on parallel shafts as the plates have to be pressed to each other during exposure and moved apart during ejection and loading. The transfer and ejection devices have permanently rotating rollers cooperating with pressure cylinders. The pressure cylinder associated with the ejection rollers is movable to and away from the latter by means of further cams synchronized with those acting on the movable pressure plate so that ejection occurs before loading. The transfer device is fed by an extractor which is coupled to the movable pressure plate, so that only its movement away from the fixed plate feeds a single sheet of film to the transfer device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.