A number of rollers 13 are disposed at certain intervals on both sides of stages A, B and C, and inwardly of the rollers 13 are provided a pair of {TAIL ~ chains} 17 which revolve between a pair of sprockets 15 and 16 by the driving force of {HEAD ~ a motor} 14 
A number of rollers 13 are disposed at certain intervals on both sides of stages A , B and C , and inwardly of the rollers 13 are provided a pair of { TAIL ~ chains } 17 which revolve between a pair of sprockets 15 and 16 by the driving force of { HEAD ~ a motor } 14
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 TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH