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