Film projector

Details Film projector Film projector

1975-04-25

1976-05-04

Schacher, Richard A.

Advancing material of indeterminate length

Means to engage longitudinally spaced modifications in material

Rotating sprocket

226145, 226156, 352187, G03B 124

Patent

active

039542149

ABSTRACT:
The sprocket assembly for periodic advancement of film in a film projector is supported axially between rotated members and is corotative with the members upon increase in axial force therebetween. One of the members is axially restrained and the second member supported for minute axial movement. Force giving rise to the corotation of the members and sprocket assembly is applied to the second member by selective energization of an electromagnet.

REFERENCES:
patent: 1286962 (1918-12-01), Eaton
patent: 3281037 (1966-10-01), Young

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