Patent ID: 7771336
Filing Date: 2010-08-10
Classification: B65H

Abstract:
1. A variable cut-off length rotary printing machine, comprising: a printing unit that can vary a printing length of a web by changing an outside diameter of a printing cylinder, and a folding machine provided downstream of the printing unit of the rotary printing machine, said folding machine comprising: a cut-off unit comprising: a processor disposed downstream of said cut-off unit and configured to process the cut sheet conveyed at a constant second speed different from said first speed; and a second belt conveyor disposed between said cut-off unit and said processor and partly directly overlapping the first belt conveyor, the second belt conveyor comprising a variable speed motor which can change a speed during conveyance of the sheet and at least one pair of conveyor belts configured to receive the cut sheet conveyed by said first belt conveyor, and convey said sheet to said processor at the constant second speed; wherein said second belt conveyor is a variable speed conveyor configured to vary a sheet conveying speed during the conveyance of said sheet so that in receiving said sheet from said first belt conveyor, said sheet conveying speed becomes approximately equal to said first speed at which said sheet is conveyed in said first belt conveyor, and in conveying said sheet to said processor, said sheet conveying speed becomes approximately equal to said second speed at which said sheet is conveyed in said processor through changing the speed of said conveyor belts from said first speed to said second speed by changing the seed of said motor.