Theodore M Weber

US Patent:

42219701, Sep 9, 1980

Filed:

Jun 18, 1979

Appl. No.:

6/049242

Inventors:

Anthony Ciavattoni - Staten Island NY
John J. Flynn - Monmouth-Hazlet NJ
Theodore Weber - Elmsford NY

Assignee:

Pennwalt Corporation - Philadelphia PA

International Classification:

G03B 4116

US Classification:

250439P

Abstract:

Film drive mechanism for use with a panoramic X-ray machine which provides continuous and discontinuous radiographic images of dental arch areas of a shifting patient. The mechanism utilizes a linkage structure which carries a pair of shiftable cam followers which are separably engageable with cam members having working surfaces configured to advance or retard the speed of rotation of the linkage structure in accordance with mode of radiographing selected, i. e. , continuous or discontinuous. A film drive shaft rotates in accordance with an output shaft connected to an output member of the cam-controlled rotating linkage structure which film drive shaft controls speed of rotation of a drum which has the X-ray film wrapped therearound.