| 摘要 |
PCT No. PCT/GB81/00159 Sec. 371 Date Apr. 9, 1982 Sec. 102(e) Date Apr. 9, 1982 PCT Filed Aug. 6, 1981 PCT Pub. No. WO82/00563 PCT Pub. Date Mar. 4, 1982.A crop cutting apparatus has two vertical axis rotary drum cutters 13, each having an upper rotor with a crop conveying surface 19 and a lower rotor carrying knives 21. Gears drive the upper and lower rotors at different angular velocities. The lower rotor has an annular rim 18 having an upper surface shaped to continue the outline of the conveying surface 19. The knives 21 protrude outwardly from beneath the rim 18 and rotate with the rim. A wiper brush 34 mounted on the conveying surface 19 projects outwardly over the rim 18 for lifting and transferring crop to the surface 19. The upper rotor may have conditioning brushes 35 for conveying crop and conditioning crop by relative movement between the brushes and the crop. The upper and lower rotors may be rotated in opposite senses to effect at least partial shear cutting. |
