Guide for tractor feed for paper webs in office machine
AssigneeU. S. Philips Corporation
InventorsWendelin Weber, Manfred Rosenthal
Life of this patent
Estimating the term…
Abstract
A paper web in an office machine is transported from the one side of a transporter (tractor) comprising a transport chain to the printing backing and back again on the other side of the transporter. In the case of multilayer paper webs, notably webs comprising more than four layers, an increasingly larger wave of the paper web tends to in front of the printing backing. In order to avoid such waves, the associated transporters comprise guide pieces for the paperweb which extend from the tractor to the vicinity of the zone of contact between the paper web and the printing backing and whose surface is situated at least substantially in the plane tangential to the printing backing at this zone of contact.
Claims10
A tractor feed device for paper webs, comprising two associated shafts, two tractors each journalled on said shafts and arranged to be driven by at least a first one of said shafts;
- each tractor comprising an endless transport chain having pins and arranged to pass about said shafts so as to define two longitudinal sides, and a pair of deflectable retaining flaps on the longitudinal sides of the tractor;
- said device further comprising a pivotable guide piece arranged adjacent an end face of a tractor, said device being adapted to feed a paper web along one longitudinal side of the tractors over said guide to a printing backing around which the web is guided, the web then being discharged along the other longitudinal side of the tractors,
- characterized in that said guide piece is arranged to extend from the tractor to the vicinity of a zone in which the paper web first contacts the printing backing, in that at least one said guide piece is pivoted to a respective tractor in a hinged manner, and said guide piece has a surface which contacts a paper web being so fed and which lies at a location within a loop formed by the paper web substantially in a plane tangential to the printing backing at the zone of first contact between the paper web and the printing backing.
Dependencies are inferred from the claim text.