Patent ID: 6796103
Filing Date: 2004-09-28
Classification: B65B

Abstract:
A machine for packaging stacks of multiply articles of paperinto wrappings obtained by wrapping sheets, the machine comprising: a first line for conveying and separating stacks of multiply articles of paper; a working station for wrapping stacks of multiply articles of paper; a second line for feeding stepwise heat-weldable wrapping sheets to the working station, each sheet being placed and kept vertically in a waiting position in the working station; a third line (3) including an upstream section fed stepwise with stacks by the first line, and passing crosswise through the working station, the third line moving at least one stack towards the sheet, so that the sheet gradually folds around the stack or stacks longitudinal contour while overlapping parallel edges of the sheet are heat-welded; said second line further including: first means and second means designed for receiving a wrapping sheet from conveying means situated upstream, for pulling said sheet to said working station, for clamping said sheet in said working station in at least one upper area; keeping means cooperating with said first means to allow said sheet to pass through said working station and to be stabilized while dwelling therein; said second means cooperating with said first means to clamp said sheet in said working station in at least a lower area and an upper area; said first means include at least one pair of first endless belts having inner runs cooperating with said keeping means, said first endless belts being mounted around relative wheels and spaced apart to engage, when operated synchronously, corresponding edges of a surface of said sheet, said first belts forming a straight section passing through at least said station; said second means include at least one pair of second endless belts mounted around wheels and spaced apart to engage, when operated synchronously and with the same speed as said first endless belts, corresponding edges of another surface of said sheet facing said second endless belts, said second endless belts defining a straight section situated in the upper part of said working station.