Film changer
US5317619A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1993 |
| Grant date | May 31, 1994 |
| Priority date | — |
| Expiry date | Feb 16, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B42/045
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed is a film feeding mechanism for use during medical x-ray techniques, particularly angiography. Sheets of film are fed sequentially at high speed from a film magazine into a film exposure device, and then into a film receiving cassette, in a manner so as to reduce damage to the films, including the build-up and discharge of static charge on the films. In the film exposure device, a free-floating lower clamping assembly clamps each film against an upper clamping assembly from the center of the film progressively outward towards its leading and trailing ends, to eliminate wrinkling of the film. The upper clamping assembly is of thin construction so as to enable the locating of an object being x-rayed closely adjacent the x-ray film, to produce x-rays of exceptionally high resolution. Feed-in wheels and pinch rollers drivingly engage one of the exposed films after an exposure operation prior to the film being engaged by feed-out wheels and pinch rollers, so as to buckle or peel the exposed film away from the upper clamping assembly and thereby precluding sticking of the film to the assembly. Film jamming in the film exposure device is reduced by a sensing device for detecting…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.