said floating support means of {HEAD ~ said conveying unit} includes two substantially the same rear floating support mechanisms that support at least two places of said rear side frame of said conveying unit, as well as {TAIL ~ a front floating support mechanism} that supports at least one place of said front side frame 
said floating support means of { HEAD ~ said conveying unit } includes two substantially the same rear floating support mechanisms that support at least two places of said rear side frame of said conveying unit , as well as { TAIL ~ a front floating support mechanism } that supports at least one place of said front side frame
OTH OTH OTH OTH OTH HEAD 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 TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH