Patent ID: 8561987
Filing Date: 2013-10-22
Classification: B41F,B65H

Abstract:
1. A machine for processing sheets, comprising: a delivery for delivering the sheets, said delivery having a delivery drum acted on pneumatically by having a vacuum applied thereto, said delivery drum having disks for carrying the sheet, each of said disks having respective diametric clearances, each of said disks defining respective vacuum channels for holding the sheets, at least one of said disks being adjustably mounted relative to another of said disks in a direction of a width of the sheets, said vacuum channels having openings, said openings and a vacuum connection together forming a rotary valve for cyclically applying the vacuum to said vacuum channels; and a chain conveyor having a circulation path, said delivery drum being disposed within said circulation path, said chain conveyor having gripper bridges, said gripper bridges plunging into said diametric clearances during circulation of said gripper bridges; a second drum, said second drum and said delivery drum forming a sheet transfer point at which said second drum successively transfers the sheets to said gripper bridges; said rotary valve being disposed such that said delivery drum is pneumatically active only within a vacuum-active angular range, said vacuum-active angular range beginning substantially only at said sheet transfer point.