A second conveying unit has a mechanism for advancing the rollers toward the intersection when the object is in {HEAD ~ 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 {TAIL ~ the intersection} 
A second conveying unit has a mechanism for advancing the rollers toward the intersection when the object is in { HEAD ~ 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 { TAIL ~ the intersection }
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 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 TAIL TAIL TAIL TAIL TAIL TAIL