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