| 摘要 |
PROBLEM TO BE SOLVED: To provide a concave screen dividable into an upper course concave screen section close to a feed chain and a lower course section separated from the chain, effective for decreasing the number of upward-directing arched partition plates applying resistance to the motion of moving culm clamped with the feed chain to a level not to cause excessive threshing treatment at the lower course concave screen section and preventing the lowering of the strength of the concave screen. SOLUTION: The number of upward-directing arched partition plates 14B is increased at the upper course concave net section 3A and decreased at the lower course section 3B. The lower course concave net section 3B is reinforced with downward-direction arched plates 14F.
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