Advancing material of indeterminate length – Threading device – With means to pull lead-end
Patent
1998-02-09
1999-07-13
Mansen, Michael
Advancing material of indeterminate length
Threading device
With means to pull lead-end
226 90, 2261183, 226188, G03B 156, B65H 2024
Patent
active
059214538
ABSTRACT:
A paper feeding apparatus is provided for use in a web threading apparatus of a rotary press for threading a web along a web threading path by drawing a leading end of the web using a web threading member movably provided on an outside portion of the web threading path and along the web threading path. The paper feeding apparatus includes a pair of an upstream roller and a downstream roller extending substantially parallel to a width direction of the web in the web threading path, and a driving mechanism for driving the upstream and downstream rollers in a feeding direction of the web and for ensuring that a peripheral speed of the downstream roller is at least equal to a moving speed of the web threading member. The upstream and downstream rollers are offset on an upstream side and a downstream side in a direction of the web threading path so that the web is not nipped by both the upstream roller and the downstream roller. A peripheral surface of one of the upstream and downstream rollers contacts a first side surface of the web and a peripheral surface of the other of the upstream and downstream rollers contacts a second side surface of the web, in a manner such that slipping between the rollers and the web is increased in response to a lowering of a tension on the web and such that slipping between the rollers and the web is decreased in response to an increase of the tension on the web. In addition, the upstream roller is displaceable in accordance with a variation of the tension on the web so as to constantly apply a force against the tension.
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Kabushiki Kaisha Tokyo Kikai Seisakusho
Mansen Michael
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