(57) An extension and centering device for rope fabric is consisting of: an extension
device, including a carrying structure at leasttwo extension rollers with double helical
rifling, driven in rotation in opposite sense of the advancing ofthefabric and having
their axes parallel, and sensor means, sensible of lateral change of direction of
the fabric, fitted after the above mentioned rollers; each roller is divided in two
tracts of substancial the same length which are engaged between them idle; the adjoining
tract between them of the two rollers are put into rotation by respective motors;
there are also forseen piloted drives of the above mentioned sensors to change the
speed of the motors on the other side of the lateral movement of the fabric, causing
the variation of rotation speed ofthetwo tracts of rollers connected to them; the
increase of rotation speed of the two tracts causes the mouvement towards the outside
of the fabric in the opposite side of the one in which it was moving until the pre-established
direction is achived again and the motors together with the respective tract of rollers
return to turn at the same speed.
|
|
