Patent ID: 7004461
Filing Date: 2006-02-28
Classification: B65H

Abstract:
1. Device for isolating the lowest sheet in each case from a stack of sheets situated in a stack holder and feeding said lowest sheet in a travel direction into drawing off rollers, each sheet having a length in the travel direction between a front edge and a rear edge and opposed lateral edges, comprising: a front edge stop on the stack holder, which permits passage of only the bottom sheet of the stack toward said drawing off rollers, the location of the front edge of said stack being at said front edge stop for all sheets of any sheet length (H); a cross member situated below the holder and extending transversely to the travel direction; a pushing-out element supported by the cross member, which grips the rear edge of the sheet in the stack and transports the sheet an isolating stroke distance (B) in the travel direction under the front-edge stop, into the drawing-off rollers, and having faces for vertically supporting the rear of the stack adjacent the rear edge; means supporting the cross-member for moving the cross member and pushing out element forwards and backwards along the travel direction; bearing elements supporting the underside of the stack adjacent the lateral edges; lateral abutment strips for maintaining registry of the lateral edges of sheets of the stack; a linear guide engaging the means supporting the cross member; and a linear motor operatively connected to the means supporting the cross-member, for linearly driving the movement of the cross member along a path of travel (A) that comprises both the isolating stroke (B) and an adjusting path (C) which is adjustable according to the sheet length (H); and a position-controlling system associated with the linear motor and the drawing off rollers for controlling the forward movement of the cross-member with the pushing-out elements in dependence upon the conveying speed of the drawing off rollers.