ROTARY

摘要

PROBLEM TO BE SOLVED: To solve a trouble of forming dragging traces on rear cover-leveled surfaces caused by the level difference between a closing board and a rear cover when cutouts formed on the right and left ends of the rear cover are closed with detachably attached closing boards. SOLUTION: A rear cover 7 which is vertically swingable and performs leveling of tilled soil is placed behind tilling tines 5, and cutouts 7a formed on the right and left ends of the rear cover 7 are closed with detachably attached closing boards 11. The closing board 11 is placed on the cutouts 7a from the outer side in a butt state in such a manner that no level difference is formed between the closing board 11 and the lower end part of the rear cover 7.