Double-apron drawing mechanism

A double-apron drawing mechanism comprising, a feed couple for feeding a fibrous material along a longitudinal path of travel;

• a delivery couple for said fibrous material on said path of travel downstream of said feed couple;
• two driven endless aprons on said feed couple driven in synchronism and having two opposed runs defining a treatment zone in said path of travel for said fibrous material passed between said opposed runs;
• said feed couple comprising a pair of driven rolls one of which is a pressure roll;
• said delivery couple being disposed downstream from an exit end of said treatment zone at which said fibrous material exits;
• a fixed stationary feed guide of said feed couple spaced from one of said rolls for guiding and supporting one of said endless aprons traveling over said stationary guide, said stationary guide maintaining said one apron extended longitudinally, said stationary guide being disposed opposite a movable guide on said feed couple for guiding and supporting the other of said aprons traveling over the movable guide and maintaining said other apron extended longitudinally, said stationary guide being disposed adjacent said exit end;
• mounting means mounting said movable guide in the vicinity of said exit end of said treatment zone for variably adjusting a gap between said runs of the aprons, comprising a driving shaft for said pressure roll, a link mounted on said shaft comprising a guide carrier pivotally mounted for carrying said movable guide and movable variably angularly to position said movable guide in inclination relative to a plane extending parallel to said path of travel, and a pivotally mounted holder for said movable guide movable variably angularly to position the movable guide in inclination transversely of said plane.