A second conveying unit has a mechanism for advancing {HEAD ~ the rollers} toward {TAIL ~ the intersection} when the object is in the intersection, and for advancing the rollers away from the intersection toward a third conveying unit when both rollers are pressed against the driven portion of the object in the intersection 
A second conveying unit has a mechanism for advancing { HEAD ~ the rollers } toward { TAIL ~ the intersection } when the object is in the intersection , and for advancing the rollers away from the intersection toward a third conveying unit when both rollers are pressed against the driven portion of the object in the intersection
OTH 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 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