Motion picture projector with reduced picture jump

Details Motion picture projector with reduced picture jump Motion picture projector with reduced picture jump

1988-01-06

1989-09-05

Hayes, Monroe H.

Optics: motion pictures

Camera and/or projector drive mechanisms

With intermittently driven carrier-engaging sprocket

352189, 352160, 352163, G03B 124

Patent

active

048632627

ABSTRACT:
A motion picture projector substantially free of picture jump comprises a gate assembly having a projection aperture and a light source for projecting light through the aperture and focusing lens and onto a screen. The film is intermittently advanced through the gate assembly by an intermittent sprocket which is intermittently rotated by a modified Geneva mechanism. The Geneva mechanism comprises a star wheel having a plurality of radially extending slots separated by curved surfaces. A rotating cam has a ring which slidably engages the curved surface of the star wheel and a pin which engages the slots as the cam rotates, rotating the star wheel a fraction of a rotation for each full rotation of the cam. The cam has a tension area adjacent the pin and a relief area remote from the pin. The tension area engages the curved surfaces of the star wheel closely, preventing backward rotation. The relief area provides a gap between ring and curved surface to allow the star wheel a small amount of backward rotation, thus relieving tension on the film during periods when the film is stationary.

REFERENCES:
patent: 777381 (1904-12-01), Ladd
patent: 955840 (1910-04-01), Messter
patent: 1554557 (1925-09-01), Hall
patent: 1801969 (1931-04-01), Moulton
patent: 2349941 (1944-05-01), Cramwinckel
patent: 2747457 (1956-05-01), Wengel
patent: 3286536 (1966-11-01), Hallmann
patent: 3855873 (1974-12-01), Fletcher et al.

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