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US 4,234,796 AGranted
Film changer for X-ray apparatus
AssigneeCompagnie Generale de Radiologie
InventorsJean Caugant, Jacques Dale
Life of this patent
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AssigneeCompagnie Generale de Radiologie
InventorsJean Caugant, Jacques Dale
Estimating the term…
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.
A film changer for an X-ray apparatus including within a light-tight casing a supply magazine for holding a stack of unexposed film in sheets, means for extracting a single sheet from said stack, an exposure station having two parallel pressure plates respectively covered on their adjacent faces by intensifying screens, one being fixed and the other reciprocably movable toward and away from said fixed one, means for transferring the extracted sheet between said pressure plates when apart, means for ejecting the film sheets after their exposure from said exposure station, and a receiver magazine for holding the exposed film sheets, wherein the extracting means comprise means for coupling it to the movable pressure plate so that its sole displacement away from said fixed plate actuate the extraction of a film sheet and its presentation to the transferring means.
A film changer as claimed 16, wherein the cartridge including means for displacing said movable pressure plate and said transfer and ejector device rollers have shafts ends projecting from one sidewall thereof and wherein the fixed part of the changer includes a single motor and transmission means for driving a plurality of shafts having coupling means for engaging with the shaft ends projecting from the casing.
Dependencies are inferred from the claim text.