Film drive mechanism for panoramic dental X-ray machine

Details Film drive mechanism for panoramic dental X-ray machine Film drive mechanism for panoramic dental X-ray machine

1978-03-24

1979-10-30

Smith, Alfred E.

Radiant energy

Fluent material containment, support or transfer means

With irradiating source or radiating fluent material

250445R, G03B 4116

Patent

active

041729773

ABSTRACT:
Panoramic dental X-ray machine having an improved X-ray film drive mechanism for coordinating the speed of travel of the X-ray film with non-constant speeds of lateral chair shift to provide continuous radiographs of typical dental arch areas. The film drive mechanism employs a non-rotating cam slidably mounted about a motor shaft which rotates an assembly comprising a tubehead and a cassette holder assembly. The non-rotating cam is provided with adjacent opposing slope areas for programming decreased film travel speed when the incisors of the dental arch are being X-rayed. The film is traveling at its slowest rate of speed when the midline of the incisors is being X-rayed while the chair is traveling at its fastest rate of speed thereat. The chair shifts during the X-raying of the anterior region only. A cam follower is mounted to a plate which is pivotally mounted to the tubehead-cassette holder assembly for rotation with assembly. The plate also mounts cable and roller means which cooperate to urge the follower to constantly contact working surfaces and the adjacent opposing slope areas of the non-rotating cam. The chair shift speed is controlled by a rotating barrel cam having a continuous groove disposed therein, which rotating groove is contacted by a follower guide secured to a platform which mounts the chair.

REFERENCES:
patent: 3867636 (1975-02-01), Miyahara
patent: 3908126 (1975-09-01), Hudson et al.
patent: 4039837 (1977-08-01), Ohta et al.

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