| 摘要 |
The machine has a frame for coupling up to a tractor and carrying one or more groups of rotors on vertical axes, and one or more support members. When in use the rotors move up and down in relation to the support. The group can pivot on a horizontal axis in front of them in the direction of travel, and extending across the machine. The axis can form part of a hinging parallelogram linkage, and the group can be spring-loaded upwards. There can be stops limiting the movement in one or both directions
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