Photographic film copying apparatus

Details Photographic film copying apparatus Photographic film copying apparatus

1984-03-06

1986-02-25

Hix, L. T.

Photocopying

Contact printing

Machine

242 752, G03B 2704

Patent

active

045726604

ABSTRACT:
In film copying apparatus (FIG. 3) in which a master film 13 and unexposed copy film 13 are drawn past an exposure gate 12 by a drive sprocket 15, the sprocket teeth 16 have a curved profile which engage with film sprocket holes such that the upper film lags behind the lower and the copy is incorrectly aligned with respect to the sprocket holes. Film strip registration means for correcting misalignment at the exposure gate comprises suction means 20 having a vacuum chamber 21 with apertured pad 23 by which the copy film is diverted out of the plane of the master film thereby increasing its path length between exposure gate and drive sprocket and advancing it at the exposure gate to re-establish registration with the master film.

REFERENCES:
patent: 1598756 (1926-09-01), Troland
patent: 1981069 (1934-11-01), Ramsey
patent: 2994489 (1961-08-01), Hare
patent: 3032245 (1962-05-01), George et al.

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