Device for gas and/or vacuum distribution, suction unit, feeder, sheet processing machine and method for piloting a device for gas and/or vacuum distribution

Abstract

The invention relates to a device for gas and/or vacuum distribution () for a sheet processing machine (), the device includes: at least one controllable pilot valve (), a fixed body () including: at least one main gas inlet () to be connected to a gas or vacuum source, at least one main gas outlet () intended to be connected to at least one suction cup and/or to at least one nozzle, at least a first and a second control gas openings (), at least one of the openings being connected to the controllable pilot valve (), at least one housing () having a first chamber () communicating with the main gas inlet () and outlet () and a second chamber () communicating with the first and second control gas openings (), at least one mobile piston () axially movable in the housing () by the action of a control gas or vacuum supplied in the second chamber () through the at least one control gas opening () connected to the controllable pilot valve (), the mobile piston () being movable between: a closed position in which the mobile piston () blocks a gas path () between the main gas inlet () and outlet () in the first chamber (), and an open position in which the mobile piston () releases the gas path (), first and second chambers () isolated from each other by cooperation of shapes between the mobile piston () and the housing () without frictional seal between the mobile piston () and the housing (). Also disclosed are a suction unit and a feeder including such a device for gas and/or vacuum distribution and a sheet processing machine comprising such feeder or such a device for gas and/or vacuum distribution.