Automatic machine for folding long sheets, particularly technical drawings

Abstract

An automatic machine for folding long sheets having first and second oscillating blades operating in a transverse motion to create alternate creases in a vertically descending sheet between a first and second upper folding rollers opposing respective first and second lower folding rollers that are rotatable with a predetermined reciprocating synchronous movement, said first and second oscillating blades being arranged to insert said sheet between said folding rollers to form folds in the sheet, whereby the folded sheet is directed towards an underlying collection shelf wherein said upper folding rollers being driven with rapid-reversal or pulse-reversal rotation by a linkage which moves them in the same direction by virtue of their connection by a toothed drive belt, engaged about their toothed end pulleys which are rotatably free, but which can be individually and alternately fixed to a shaft of their own respective roller following the operation of an electromagnetic clutch, said first upper folding roller being connected to said second upper folding roller by a series of gearwheels causing said first and said second upper folding rollers to rotate in opposite directions.

Dependencies are inferred from the claim text.