Advancing material of indeterminate length – With material-responsive control means – To position material laterally
Patent
1988-04-18
1990-04-24
Watkins, Donald
Advancing material of indeterminate length
With material-responsive control means
To position material laterally
242 571, 271250, B65H 23038, B65H 2300
Patent
active
049193180
ABSTRACT:
Side registration is provided for a web during its forward movement by lateral movement of the web causing one side edge of the web to engage a registration edge guide, by moving the web sideways with self-skewed pivotal rollers engaging and driving the web at their nip. Two separate roller drive systems with a slight speed differential are utilized in cooperation acting on the same web. A downstream, fixed nip, non-slip, roller drive system drives the sheet in its primary direction of movement, at a first driving velocity. Simultaneously, the same web is driven at an upstream position by a pivotal nip drive roller system. This upstream (pivotal nip) roller system is mounted on a pivot arm to pivot therewith, and is driven at a second driving velocity which is slightly lower than the first driving velocity of the other, downstream, roller drive system. This pivotal drive roller system self-pivots downstream into an equilibrium nip position wherein the nip is at a small angle to the side registration edge guide and has a resultant slip velocity frictional lateral force. That lateral force pulls the web sideways towards the side registration edge in proportion to the angle of the pivotal nip resulted from the slight difference between the two nip driving velocities.
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Watkins Donald
Xerox Corporation
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