Importance

Loading Importance Indicators...

Abstract

A jaw cylinder has sets of fixed and movable jaws arranged at circumferential spacings thereon for folding the printed sheets into signatures as the sheets are thrust into the jaw cavities by folding blades on a folding cylinder. The movable jaws are mounted fast on respective jaw carrier shafts for pivotal motion into and out of engagement with the fixed jaws. For such pivotal motion of the movable jaws, the jaw carrier shafts are engaged via cam followers with a jaw drive cam of annular shape mounted to the frame, so that the movable jaws successively pivot toward and away from the fixed jaws upon rotation of the jaw cylinder. A timing screw acts between the jaw drive cam and the frame to cause angular displacement of the former relative to the latter about the axis of the jaw cylinder, in order to time the opening and closing of all the sets of jaws to the thrusting of the sheets off the surface of the folding cylinder by the folding blades.

Loading the Abstract Image...

First Claim