Apparatus for folding printed paper sections

摘要

A jaw cylinder at the folding station of a web-fed printing press where a continuous web (W) of printed paper is cut into sections by a cutting cylinder (2) while riding on a folding cylinder (3). Each paper section (PS) has its midpart subsequently pushed by a folding blade (23) on the folding cylinder into a jaw cavity (24) in a jaw cylinder (4) in order to be folded into a signature while being transferred from the folding cylinder onto the jaw cylinder.

In order to preclude ink transfer between the contacting surfaces of each paper section by being gripped hard by jaws (31, 32), a pair of hooks (11) are mounted adjacent the opposite ends of the jaw cavity in the jaw cylinder for movement into and out of a space created by the midpart of each paper section upon insertion in the jaw cavity. A hook drive cam (42) causes the hooks to travel into and out of hooking engagement with the midpart of the paper section.