Rotor pour appareils destinés à la désagrégation de la paille ou matière similaire

1,077,271. Chopping straw. A. B. GRONBERG. Jan. 11, 1966 [Jan. 15, 1965], No. 1186/66. Heading A4C. In a straw-cutting machine of the type in which a rotor carries a number of longitudinal rows of knives 6 which pass through spaces in a row of stationary knives 8 which may be adjusted for tilt at 16, the knives 6 are fastened to radial arms 20 radiating from hubs 19 carried on the rotor shaft 5, there being a knife on each side of each arm and each row of rotor knives and their associated arms being passed through by a cross-rod 22 parallel to the rotor shaft secured by nuts at either end to end plates (24) also carried on the rotor shaft. Distance pieces 21 are provided. Additional knives may be provided between those adjacent the arms, the cross-rods passing through these also, distance pieces being provided as necessary. Various means are described for clamping the knives in position. Thus, the cross-rods may pass through either holes in the knives or notches open to one side. At the radially inner end, the knives may extend to the shaft and be clamped there by distance pieces (28) and may have arcuate notches (27) on their ends to fit the shaft (Fig. 6, not shown). Alternatively a notch in the knife may fit over a projection on the arm (Fig. 7, not shown). In other embodiments, shorter knives are used which may be seated in grooves in the arms (Figs. 10 and 11, not shown) or have an angular notch (39) on their radially inner end engaging an abutment 38 on the arm (Figs. 12 and 13, not shown). The pitch of the rotor knives is preferably twice that of the fixed knives, and from 2 to 4 rows of rotor knives may be provided. The machine may form part of a combine harvester.