Sprocket wheel for photographic camera

Details Sprocket wheel for photographic camera Sprocket wheel for photographic camera

1980-02-22

1983-04-05

Dorner, Kenneth

Endless belt power transmission systems or components

Positive drive pulley or guide roll

Having nonmetallic component

474152, 74457, 74462, F16H 1900

Patent

active

043789650

ABSTRACT:
An improved sprocket wheel for substantially planar feeding of a strip of film in a photographic camera by applying a thrust to end edges of two parallel and spaced apart rows of perforations provided along the film strip includes two corresponding trains of film feeding teeth, each tooth having a curved film thrusting surface confronting the plane along which film is fed in the camera and comprising a base portion having a gentler slope with respect to the film feeding plane than an involute tooth profile and an upper portion having a steeper slope with respect to the film feeding plane than an involute tooth profile, and further having a ridge defined between the outer side surface and the film thrusting surface of each tooth to substantially conform to a rounded corner of each film performation and thereby facilitate smooth feeding of the film.

REFERENCES:
patent: 779165 (1905-01-01), Junghans
patent: 3969947 (1976-07-01), Martin et al.
patent: 4051744 (1977-10-01), Oshima
patent: 4078445 (1978-03-01), Kiser, Jr.
patent: 4148225 (1979-04-01), Redmond, Jr. et al.

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