PURPOSE:To permit the easy replacement and inspection for a bush by installing a bush support in which the bush in which the bush is inserted in demountable ways at the position of a chaff raising spiral shaft inside a chaff tank in the upper part and fitting the bush at the top edge f a collar fixed at the upper part of the shaft. CONSTITUTION:When a bolt 24 is loosened to replace a bush 26, a chaff tank 22 shifts in the axial direction of a chaff raising spiral shaft 13, and the bush 26 can by easily demounted from a bush support 25, and easy replacement is permitted. Further, the lower edge of the chaff raising spiral shaft 13 is formed into a square shaft part 16, which penetrates through the hole on a bottom cover 15 and is inserted into a square hole 28 on a bevel gear 17, and therefore, also the chaff raising spiral shaft 13 can be pulled-out as it is when the chaff tank 2 is demounted, and the replacement with a new part can be carried-out simply.
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