X-ray or gamma ray systems or devices – Photographic detector support – Serial film or film pack changer
Patent
1988-10-28
1990-05-08
Fields, Carolyn E.
X-ray or gamma ray systems or devices
Photographic detector support
Serial film or film pack changer
378172, 378174, G03B 4202
Patent
active
049244868
ABSTRACT:
A programmable X-ray film changer for use, for example, in making angiograms, is provided with an improved pressure plate mechanism, feed and removal mechanism, photographic plate indexing mechanism, a clutched single cycle drive mechanism, a receiving photographic plate cassette and control methodology. The improvements in combination permit a substantial reduction of the number of parts in the film changer resulting in increased reliability, a decrease in the expense of manufacture, and decreased weight. Furthermore, the X-ray photographic film changer is arbitrarily orientable in space and independent of gravity feed mechanisms or the interference of gravity with respect to its operation. The improved pressure plate is normally substantially flat and is bowed to form a convex surface by a pressure plate bowing mechanism. Misfeeds of multiple numbers of photographic plates are thus tolerated by the natural resiliency of the pressure plate. Bowing of the pressure plate is used to actuate feeding and removal of the photographic plates into the exposure position. Alphanumeric information is arbitrarily photographically printed onto the photographic plate subject to programmable control. The exposed photographic plates are disposed within a spiral receiving cassette. The natural resiliency of the photographic plates lays the photgraphic plate on the radially outermost surface of the spiral receiving chamber. Thus, receipt and storage of the exposed photographic plates is independent of gravity feed. The operational cycle of the film changer is arbitrarily programmable and controlled through a single cycle clutch which is driven by a continuously operated motor. Thereby, multiple film changers can be operated in combination through arbitrary program control without synchronization of their respective drive motors.
REFERENCES:
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patent: 3775613 (1973-11-01), Hommerin
patent: 3862426 (1975-01-01), Thomas
patent: 3967126 (1976-06-01), Otto, Sr.
patent: 4234796 (1980-11-01), Caugant et al.
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patent: 4418420 (1973-11-01), Bauer et al.
patent: 4428658 (1984-01-01), Moore et al.
Johansson Lief A.
Weber Otto K.
Fields Carolyn E.
Medrad Inc.
Porta David P.
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