Printing cylinder with retractable plate register pin and method of assembly
AssigneeR. R. Donnelley & Sons Company
InventorRonald Banike
Life of this patent
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Abstract
A magnetic printing cylinder has retractable plate register pins. The printing plate is positioned on the cylinder by engagement of an edge of the plate with the pins in extended position. The pins are moved to retracted position and the plate wrapped around the cylinder. The pin moves radially of the cylinder in a bushing. O-rings on the pin limit outward movement of the pin and resist pin rotation. In assembly of the cylinder, the pin and bushing extend above the cylinder surface and are ground to the final cylinder dimension.
Claims16
In a printing cylinder having a peripheral surface and magnet structure for holding a thin elongate printing plate thereon, two retractable plate register pins comprising:
- means defining a hole for each pin in each cylinder, said holes extending radially inwardly through said peripheral surface such that the register pins being spaced apart along a line parallel with the cylinder axis;
- and
- a pin slidably mounted in each hole for selective disposition in an extended position with an outer portion of the pin extending to above the cylinder surface a distance greater than the thickness of the printing plate for engagement with said printing plate for proper alignment of the printing plate and in a retracted position in which the pin outer portion does not extend above the cylinder surface a distance greater than the thickness of the printing plate,
- wherein the printing plate is positioned against the register pins for proper alignment while the magnetic structure of the cylinder simultaneously forces the plate down and around the cylinder surface.
The method of assembly of a retractable plate register pin with a printing cylinder, comprising:
- drilling a hole in an outer surface portion of the cylinder;
- inserting a bushing and pin in said hole, with the pin retracted in the bushing, said bushing and pin extending to above said outer surface portion of the cylinder;
- finishing the outer surface portion of the cylinder;
- and
- causing the bushing and pin to be flush with the finished surface of the cylinder.
Dependencies are inferred from the claim text.