Arrangement for separating and transporting uppermost sheets of a stack of sheets or sheet-like objects

摘要

An arrangement for separating and transporting uppermost sheets of a stack of sheets or sheet-like objects has a movable suction mouthpiece in which negative pressure acting for adhering the sheet simultaneously controls the movement of the suction mouthpiece in a longitudinal direction in a guide, the movable suction mouthpiece is connected with a valveless pump which produces in a connecting conduit between the suction mouthpiece and the pump periodically alternating negative pressure and positive pressure phases, and the guide of the movable suction piece is arranged so that a movement direction provided by the guide is inclined relative to the direction of the force of gravity at such an angle that the resultant of a lifting movement of the sheet produced during the lower pressure phase of the movable suction mouthpiece and the falling movement produced during the positive pressure phase has a component acting in a desired transporting direction of the sheet.