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 chains 17 which revolve between {HEAD ~ a pair} of {TAIL ~ sprockets} 15 and 16 by the driving force of a motor 14 
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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 chains 17 which revolve between { HEAD ~ a pair } of { TAIL ~ sprockets } 15 and 16 by the driving force of a motor 14
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