Film Pulldown Mechanism Based on a Design by Samuel B. Grimson

Before his death in 1955, Samuel B, Grimson^* developed an ingenious film pulldown and film registration mechanism that formed a part of a special contact printer, designed specifically to achieve a “dot by dot” order of registration between the negative and positive films at the printer aperture, as is required for rendition by line-screen and reseau processes. Registration is derived from a claw and pilot-pin method that assures perfect registration between the films without any punching or bruising action by the claws or by the pilot pins. Grimson's mechanism is described by a man who for many years was associated with him and who designed and constructed most of his laboratory equipment.

Print ISSN

0361-4573

Published

1958-06

Content type

Original Research

DOI

10.5594/J11124