Patent GB-378924-A (GB)
Title: Improvements in axial thrashing machines or axial thrashing and straw-reducing machines
IPC: A01F7/06
Filed: 1931-03-09
Abstract: 378,924. Thrashing &c. machines. SCHLAYER, K., Wasserburg-on-Bodensee, Germany. March 9, 1931, No. 7251. [A Specification was laid open to inspection under Sect. 91 of the Acts, March 12, 1931.] [Classes 5 (i) and 58.] An axial thrashing or axial thrashing and straw reducing machine of the type in which rotary working elements are mounted on an horizontal shaft in a casing having at the bottom a sieve and at the top an enlargement so that the materials can move from the working elements and then be forced back into their path has the enlargement so shaped that the materials move out of the path of the working elements tangentially but are returned to it radially. The material to be thrashed is fed into the casing 1 through an inlet 10 below which a thrashing ridge 8 is provided. It is beaten by broad ribbed thrashing plates 6 on arms 5 extending from the preferably hollow shaft 4 and grain falls on the sieves 13 forming the bottom of the casing. A helical baffle 9 guides the material down the casing away from the inlet 10. Beyond the inlet the upper portion of the casing is provided with an enlargement 14, Fig. 4, gradually increasing from the central horizontal plane of the casing to a plane in line with the top of the feed inlet where it abruptly terminates in a radial wall 15 below which a thrashing ridge 16 is arranged. A disc 17 with a conical detachable rim is arranged at the end of the thrashing chamber, straw escaping through the gap between the rim and the casing ; grain is separated off by an inclined plate 21 arranged on the sieve 13. Wind vanes may be arranged on the disc 17 which is provided with apertures 20. The beater arms 5 are arranged in helical formation the helix being of small pitch. Baffle plates 24 and rows of projecting pins may be fitted on the casing. In a modification the thrashing section of the machine is followed by a straw reducing section in which straw tearing elements are fitted. Rotating forks co-operate with corresponding elements secured to the casing in axial rows. The stationary straw tearing elements are composed of reversible thick knives one edge being formed plain and the other having saw teeth: the knives may be integral with securing plates there being preferably three knives on each plate the middle knife being shorter than the others. The spacing, positioning and direction of the knives may be varied. An obstruction disc is arranged at the end of the straw reducing section. The Specification as open to inspection under Sect. 91 (3) (a) comprises also apparatus for subsequent treatment of the straw and grain. As shown in Fig. 14 (Cancelled), this comprises one or more tossing chambers 41, 42, a discharge or aspirating chamber 43 and a blower 44. Rakes 49 in the tossing chamber throw the short straw or chaff into recesses 51, 52 extending outwardly at each side at the top of the chamber. The recess 51 contains an inclined sieve 53, Fig. 17 (Cancelled), above which is a second sieve or grid 54 curved upwards at its outer end. The other recess 52 has a lower sieve 53 but is provided with a guide surface 55 instead of a sieve 54. These recesses extend along the casing up to the blower chamber. Recesses somewhat similar may be arranged in the thrashing part of the casing. The chambers 41, 42 are separated by a wall 56 with a central opening and the chambers 42, 43 by a wall 63 with a much larger opening. A sieve 59 forms the lower part of the chamber 42. The blower chamber is divided by a partition 71 into two suction chambers 72, 73 ; the straw &c. fed through openings from the aspirating chamber 43 is forced by the blades 69 of the blower through a lateral passage 70, the chaff, if desired, being discharged through a second passage, a shutter being arranged to control such discharge. Air is taken from the blower through pipes 87 leading to the recesses 51, 52 to assist in separating the corn and the straw. Swinging rakes 89 or other movable devices in the recesses may also assist in the separation. The grain &c. that escapes through the various sieves in the thrashing and tossing chambers or that is separated out by the deflecting plates at the end of the thrashing chamber falls into a casing 91 at the bottom of which a worm conveyer 92 is situated. The conveyer 92 is provided with awning devices consisting of roughened friction plates 93 that toss the grain against roughened roofing plates 94. The conveyer carries the grain to a winnowing device 84 that consists of a box-like structure over the conveyer provided with an inclined guide member on to which plates mounted on the conveyer throw the grain. A jet of air sweeps across the plate to carry light material to an exhaust passage leading to the blower. The winnowed grain passes to an elevator 100 that carries it to an ordinary winnowing device 101. The grain separated in the chambers 41, 42, 43 may be collected separately from that separated in the main thrashing chambers. In a further modification the straw &c. from the thrashing devices is beaten in a tossing chamber the straw being thrown out through a lateral passage while the grain is passed directly to a shaking sieve ; the walls of the casing are corrugated transversely to the machine axis. This subject-matter does not appear in the Specification as accepted.