Definitions for "Gripper margin"
Keywords:  unprinted, blank, clamp, press, edge
The unprintable part of a sheet, caused by the press's gripper. The size of the margin varies according to the press used. It's safe to factor ½" for our larger presses and ¼" for our duplicators, or small presses.
The unprintable area of the paper where it is gripped as it passes through the press.
The room needed on the sheet of paper for the grippers. This area will not print.