Roller for conveying material such as paper, fabric, plastics or metal, in sheets of lengths - has part of its periphery provided with suction pieces for altering pressure

摘要

The roller for conveying substrate such as sheets or lengths of paper, sheeting, fabric, plastic, metal etc, has parts (19) of its periphery which exert force, with the aid of a vacuum, onto the substratum. The substratum is pressed onto the periphery of the mostly cylindrical roller. A suction-piece or pieces (19) driven by compressed air and fixed to the roller on its periphery has an effective surface (26) on the roller's periphery. The compressed air is conveyed to and from the suction piece (19) by inlets (14) and outlets (15). ADVANTAGE - The vacuum can quickly be built up and reduced.