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Film changer

  • US 4,893,322 A
  • Filed: 11/15/1985
  • Issued: 01/09/1990
  • Est. Priority Date: 11/15/1985
  • Status: Expired due to Fees
First Claim
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1. A medical film changer for an x-ray apparatus, which comprises:

  • a magazine for holding a plurality of unexposed sheets of film;

    a film exposure device for receiving a sheet of film from the magazine, the film exposure device including a film backing plate and a film pressure plate having a natural substantially flat configuration, for receiving the sheet of film therebetween, and the pressure plate being movable toward and away from the backing plate;

    a film-receiving cassette adjacent the film exposure device for receiving an exposed sheet of film from the exposure device, the film-receiving cassette including a guide plate formed into an inwardly spiraling configuration having an open end and an inner end;

    first film feeding means in the magazine for feeding sheets of film to the film exposure device;

    actuating means in the film exposure device for operating the film feeding means in the magazine;

    second film feeding means in the film exposure device for feeding unexposed sheets of film fed to the exposure device by the first feeding means in the magazine, into a exposure position between the backing plate and the pressure plate;

    means in the film exposure device for moving the pressure plate toward and away from the backing plate;

    means in the film exposure device for flexing the pressure plate from its natural substantially flat configuration into a convex configuration as the pressure plate is moving away from the backing plate by the pressure plate moving means, with outer ends of the pressure plate moving back to initial positions as the pressure plate is moved toward the backing plate and back to its natural substantially flat configuration by the moving means, such that the pressure plate applies pressure to the unexposed sheet of film progressively outward from the center of the sheet of film toward opposite ends thereof; and

    third film feeding means in the film exposure device for feeding the exposed sheet of film out of the exposure device into the open end of the spirally formed guide plate of the film-receiving cassette such that the exposed sheet of film travels along an interior surface of the guide plate and assumes the spiral configuration thereof.

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