Browse Prior Art Database

Film Clamp

IP.com Disclosure Number: IPCOM000081167D
Original Publication Date: 1974-Apr-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Gilpin, SR: AUTHOR

Abstract

A film clamp arrangement is provided to enable rapid positioning, mounting and demounting of fixed size sheets of unexposed photographic film on the drum mount of an optical image plotter while in a totally dark environment.

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Film Clamp

A film clamp arrangement is provided to enable rapid positioning, mounting and demounting of fixed size sheets of unexposed photographic film on the drum mount of an optical image plotter while in a totally dark environment.

The film clamp consists of a small one-piece unit of spring steel having a circular hole at one end, through which a locating pin is inserted. Two such locating pins are permanently fixed to the surface of the drum upon which the photofilm is to be mounted. The locating pins and the holes in the film clamps serve to conveniently mount the film sheet in the correct location on the drum surface, while operating in a dark room environment where the use of a safelight is precluded due to the nature of the film being mounted. Where different sized film sheets are to be used, the drum may be designed so that the locating pins could be moved and located at various fixed distances from each other, in accordance with the size of the film.

Prior to mounting a film sheet on the drum surface in the dark room, the film sheet is removed from a storage container and the film clamps are attached to the leading edge corners of the film; the film clamps gripping the film under spring tension. Where many sheets may be plotted in a continuous run, film clamps may be attached to the sheets as they are removed from the storage container and then stored in a light-tight container, available for fast loading onto the drum.

When mounting a film sheet on th...