Paper perforation system

A perforation forming apparatus for a web fed paper processor comprising:

• a rotatable perforator cylinder comprising a longitudinal axis, and having at least a blade protruding radially from the perforator cylinder, extending axially therealong and being substantially parallel to the longitudinal axis;
• a rotatable anvil cylinder being adjacent the perforator cylinder and contiguously engageable therewith, the anvil cylinder having a longitudinal axis of rotation parallel to the longitudinal axis of the perforator cylinder;
• one of the perforator cylinder and the anvil cylinder being supported by eccentric bearing assemblies;
• the eccentric bearing assemblies comprising fluid cooled bearings eccentrically mounted in bearing housings;
• the eccentric bearing assemblies being adapted for rotation such that the one of the perforator cylinder and the anvil cylinder can be pivotally displaced between a first and a second position;
• the first position defining a perforation position wherein the blade just contacts the anvil cylinder, and the second position defining a non-perforation position wherein a radial clearance gap between the blade and the anvil cylinder is at least equal to twice a thickness of a paper web adapted to be fed through the perforation forming apparatus;
• whereby the one of the perforator cylinder and the anvil cylinder is displaceable to the second position during operation in order to temporarily suspend perforation of the paper web, and is returnable to the first position during operation in order to resume perforation of the paper web.