Furthermore, reference numeral in FIG 3 designates air sealing plates mounted in a vertically movable manner to the bottom end portions of the front and rear side walls by means of a guide plate and a plurality of {HEAD ~ stud bolts} , and these air sealing plates are slidably held in contact with the canvas belt , so that the gaps between {TAIL ~ the front and rear side walls} and the canvas belt can be air tightly sealed 
Furthermore , reference numeral in FIG 3 designates air sealing plates mounted in a vertically movable manner to the bottom end portions of the front and rear side walls by means of a guide plate and a plurality of { HEAD ~ stud bolts } , and these air sealing plates are slidably held in contact with the canvas belt , so that the gaps between { TAIL ~ the front and rear side walls } and the canvas belt can be air tightly sealed
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