ANORDNING FOR DEMPNING AV DEN INTERMITTENTA TRYCKSPENNINGEN MELLAN GUMMI- OCH TRYCKCYLINDRAR VID TRYCKPRESSAR

摘要

A lithographic sheet-fed press having an impression cylinder with a gap formed in the surface thereof and having a cooperating blanket cylinder having bearers at its ends. A pair of auxiliary short bearer members bridge the gap in the impression cylinder, presenting arcuate edges for engagement with the bearers on the blanket cylinder, the bearer members are arranged at such radial height that when the blanket cylinder rolls into the region of the gap the force of printing pressure between the cylinders is taken over by the auxiliary bearer members to maintain the transaxial pressure between the cylinders substantially constant throughout the revolution thereby avoiding the cyclical impact accompanying sudden build-up of printing pressure at the end of the gap. The bearer members are guided for adjusting movement in a generally radial direction along precisely parallel paths to achieve corresponding settings to preserve the condition of constant pressure upon making a change in the thickness of the sheet stock being printed.