Anti-wrinkle system for a web offset press
AssigneeQuad/Graphics, Inc.
InventorsJeffrey W. Sainio, Craig J. Peglow, Alan D. Lasecki
Life of this patent
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Abstract
The invention relates to a system and method of eliminating wrinkling, tearing and web-breaks of a web in an offset printing press as the web contacts the chill rollers on start-up. The system operates to eliminate the wrinkling that generates the tearing. During startup, a spreader roller impinges the web, stretching out wrinkles. During acceleration of the press, when thermal contraction of the paper also achieves the desired stretching, the spreader roller is retracted to prevent smearing of ink on the web. Uneven pressure of the spreader is utilized to implement steering of the web to enhance web centering.
Claims11
A method for the removal of wrinkles from a web at chill rollers of an offset printing press, comprising:
- detecting a condition of web motion in a web path during start-up;
- in response to said condition, moving a spreader roller into the web path to impinge the spreader roller into the web at a point between a dryer and the chill rollers thereby spreading the web;
- and
- removing said spreader roller at the commencement of normal printing.
A method for removing wrinkles from a web travelling along a web path through an offset printing press, the method comprising:
- providing a spreader roller;
- moving the web along the web path;
- detecting a condition of web motion in a web path during start-up;
- and
- in response to said condition, moving the spreader roller into the web path such that the spreader roller spreads the web.
Dependencies are inferred from the claim text.