Addressograph Multigraph Corporation

Willard James Holman

Thomas V DeRyke

Morris Tolliver

Apparatus for developing diazo type films includes an ammonia chamber having an electrically heated heat transfer plate disposed therein dividing the ammonia chamber into upper and lower portions. Two pairs of rollers are disposed at opposite ends of the ammonia chamber in parallel relationship to the transfer plate for transporting the film over the heat transfer plate. A pressure roller is positioned within the upper portion of the ammonia chamber above the heat transfer plate for maintaining the film in intimate contact with the plate to provide for an efficient transfer of the heat between the heat transfer plate and the film. An inlet for an ammonia gas developer is provided in the lower portion of the ammonia chamber, and passages are provided around the heat transfer plate to permit the ammonia gas developer to flow around the plate and into the upper portion of the ammonia chamber while being heated by the plate.

Developer apparatus

A vertical rise sheet feeder is provided comprising means responsive to the weight of a stack of sheets for positioning and maintaining the stack at a feed level for the feeding of a single sheet at a time from the top of the stack. The sheet feeder includes a fixed platform and a vertically movable platform for supporting the stack. The movable platform is powered by a stabilizer means and its movement is regulated by linkage means interconnected by a torsion bar. The torsion bar controls operation of the linkage means in unison and provides a degree of freedom to the movable platform for maintaining the top of the stack in an aligned position such that a feed roller means exerts uniform and equal forces on the sheets to provide for accurate and positive feeding of the sheets from the stack. The feeder also includes a sheet locating and guiding means for maintaining the stack of sheets centered on the movable platform and for guiding the sheets as they are fed from the stack.

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Barrington, IL, United States of America

Willard James Holman