Method of checking the presence or absence of an X-ray sheet fil

Details Method of checking the presence or absence of an X-ray sheet fil Method of checking the presence or absence of an X-ray sheet fil

1988-07-20

1989-12-12

Church, Craig E.

X-ray or gamma ray systems or devices

Photographic detector support

Serial film or film pack changer

378185, 271 90, 414416, G03B 4202

Patent

active

048872849

ABSTRACT:
A method of checking the presence or absence of an X-ray sheet film in a cassette inserted into an automatic film unloading or loading apparatus, utilizes a proximity sensor arranged in the apparatus to sense position changes of a sheet film supporting foil which is arranged for a limited movement in the cassette. The proximity sensor is connected to an electronic control device which controls the operational sequence of the unloading and loading apparatus. When the gripping member preferably in the form of a suction cup seizes a sheet film on the supporting means in the cassette, the supporting means remain in its rest position after the sheet film is removed. However, if no film is present on the supporting means, the suction cup seizes the supporting means and displaces the same from its rest position. This change is sensed by the sensor and a signal is delivered to the electronic control circuit which modifies the operational sequence accordingly.

REFERENCES:
patent: 4189136 (1980-02-01), Robinette
patent: 4589125 (1986-05-01), Schmidt
patent: 4659929 (1987-04-01), Fujiwara et al.
patent: 4796285 (1989-01-01), Sakakihara et al.

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