Web handling cylinder with modulated tension loss
AssigneePresstek, Inc.
InventorsNandakumar Vaidyanathan, Steven Degon, Robert Bruce Lowd, Brian Roland Lamoureux, Keith Vaillancourt, James Hand
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Abstract
Systems and related methods are provided for modulating web tension loss at the edge of spool-hosting cavities in a cylinder by displacing the feed path and/or the exit path of the web material.
Claims34
A web-handling system comprising:
- a) a cylinder including a circumferential surface;
- b) a first winding device disposed in the cylinder for feeding a web material onto the circumferential surface of the cylinder along a feed path;
- c) a second winding device also disposed in the cylinder for receiving the web material off the circumferential surface of the cylinder along an exit path;
- and
- d) a displacement device for displacing at least one of the paths of the web material.
A web-winding device for wrapping a web material around a cylinder along a travel path leading from an interior of the cylinder over a surface thereof and back into the interior of the cylinder, the device including a tension adjuster for adjusting a tension in the web material by displacing a portion of the web material in relation to a plane tangent to a contact point on the cylinder, the contact point being where the portion of the web material leads onto or comes off the cylinder surface, and the tension adjuster being configured to contact the web material only between a rotational axis of the cylinder and the tangent plane at the contact point.
A method for adjusting tension in a web material feeding onto and coming off a circumferential surface of a cylinder, the method comprising displacing a portion of the web material only between a rotational axis of the cylinder and a plane tangent to a contact point on the circumferential surface of the cylinder, the contact point being where the portion of the web material feeds onto or comes off the surface of the cylinder.
Dependencies are inferred from the claim text.