The invention provides an arrangment that automatically sets {HEAD ~ the rollers} of {TAIL ~ the grid} of rollers into self rotation 
The invention provides an arrangment that automatically sets { HEAD ~ the rollers } of { TAIL ~ the grid } of rollers into self rotation
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH