(57) [Abstract] To adjust the air flow without decreasing the blowing velocity of air blown from the OBJECTIVE blowout guide hole, rather than to limit the amount of air flowing into the bucket, the number of blowout guide hole to be used Limiting the air volume by limiting. [Configuration] and blade 9a~9h for opening and closing the blow guide hole 8 on a lower surface of the lid 2, the cam shaft 10 with the cam groove is formed with pivot shafts 17 provided at one end of the blade is inserted And, the blade to close the adjustment shaft 26 which rotates the cam shaft, by rocking means constituted by the joint 27 for connecting the adjustment shaft 26 and the cam shaft 10, the lower part of the blow-out guide hole 8 9a~9h was sequentially swing to open the blow-out guide hole 8, to obtain the desired blowing air amount.
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