Device for eliminating the curl of sheets emerging from a fixing station
AssigneeOlivetti-Canon Industriale S.p.A.
InventorsRiccardo Forlani, Michele Olivero
Life of this patent
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Abstract
An image is fixed to a sheet of paper, in an image reproducing machine in a fixing station (GF). This uses heat and pressure to fix the image. A pair of straightening rolls (24, 26) downstream of the fixing station apply tension to the sheets in the direction of advance and forward them in a direction which inclines by a predetermined angle of correction with respect to the direction (21) with which the sheets leave the fixing station. The straightening rolls form a nip (62) therebetween and this may extend around a portion of the periphery of one of the rolls such that sheets passing therethrough are bent in an opposite direction to their natural direction of curl.
Claims6
A device for eliminating the curl of sheets emerging from a fixing station of an image reproducing machine, comprising:
- a fixing station for fixing images to sheets by pressure and heat, said sheets having a natural leaving direction from the fixing station;
- a pair of straightening rolls installed downstream of said fixing station in order to apply a tension to said sheets and to forward them in a direction of advance out of line with said natural direction by an angle of correction of not less than 5.degree., wherein said straightening rolls are arranged away from said fixing station by a distance D given by the relation:
- D.ltoreq.V.Tr, Tr being the characteristic time of cooling of a sheet emerging from the fixing station at speed V.
Dependencies are inferred from the claim text.