The apparatus 1, wherein {TAIL ~ the axis} of each of the supporting rollers is spaced from the axis of an adjacent supporting roller or of a driving roller by a distance ranging from 2 to 4 times the diameter of {HEAD ~ a supporting roller} 
The apparatus 1 , wherein { TAIL ~ the axis } of each of the supporting rollers is spaced from the axis of an adjacent supporting roller or of a driving roller by a distance ranging from 2 to 4 times the diameter of { HEAD ~ a supporting roller }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD