Back to results
US 6,073,556 AGranted
Method and apparatus for handling printed sheet material
AssigneeHoward W. DeMoore
InventorsHoward Warren DeMoore, John Andrew Branson
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeHoward W. DeMoore
InventorsHoward Warren DeMoore, John Andrew Branson
Estimating the term…
A transfer cylinder for supporting freshly printed sheet material between printing units or at the delivery unit of a printing press is provided with an ink repellent, flexible jacket covering for supporting and transporting the sheet material without transfer of wet ink from one sheet to a successive sheet and without smearing the ink or causing indentations on the surface of the sheet material. The circumferential support surface of the transfer cylinder is covered with a conductive, fluoropolymer layer secured to the surface of the transfer cylinder beneath the protective, wash-free disposable flexible jacket covering. The low friction properties of the conductive base covering permit free movement of the ink repellent, flexible jacket covering relative to the transfer cylinder surface. Electrostatic charges delivered to the flexible jacket covering by the printed sheet material are drawn away from the flexible jacket covering and are discharged into the transfer cylinder by the conductive base covering.
A method for transferring sheet material which has been freshly printed in a printing press, comprising the steps of:
A method for rotary offset printing in an offset press having multiple printing units, each printing unit employing a blanket cylinder and an impression cylinder for printing a printed image onto one side of a sheet transferring between, comprising the following steps performed at each printing unit in succession;
In a transfer cylinder for supporting a freshly printed sheet as it is transferred from one printing unit to another, the transfer cylinder having an electrically conductive sheet support surface and a flexible jacket covering movably disposed over at least a part of the electrically conductive sheet support surface for engaging one side of a freshly printed sheet during the transfer thereof, the transfer cylinder rotating about a transfer cylinder axis, the improvement comprising:
A transfer cylinder for supporting and transferring a freshly printed sheet as it is transferred from one printing unit to another, the transfer cylinder rotating about an axis of rotation, comprising, in combination:
Dependencies are inferred from the claim text.