ft HSS Fan Reinforced shaft iN d l l iN d l l G G B3-DV6-B Bevel-helical gear units B3

Flender/Flender Gear Units/Bevel-helical gear units B3

reel on Harvesting and Threshing 1 the header unit are different from that used either in straight-through, atland, or hillside combine. The pickup reel collects the cut crops and passes the material either to the in-clined canvas conveyor or auger for feeding them to the cylinderconcave assembly. Sucha pickup reel has proved effective even to lift the lodged crops before cutting. Unlike theconventional reel in straight-through combine, each slat in the pickup reel is replaced with large number of closely spaced curved ngers attached with the square bar that follows mechanisms such as, eccentric spider control, cam control, or planetary gear con-trol, so that they always remain parallel to the ground. This arrangement causes the ngersto enter the windrow or the lodged material and lift it gently above the cutter-bar thatcuts the crop during its forward motion. Therefore, the pickup-type reel in combine isalways preferred over the conventionally used xed-bat-type reel that results in much higher header loss than using the former. The cutter-bar adopted in all types of combine is reciprocating type the construc- tion and design of which are similar to those of mower. The cutter speed of combineis kept half the speed of mower, and it lies in the range between 4 and 4 rpm (8 strokes/min). Second, the knife sections are serrated on the upper surface and aresharpened when needed. On the other hand, the ledger plates are made smooth, and the guards are tempered and hardened following the special methods. Beside these, the straight-through self-propelled combines (see Figs. 1 and will have additional and essential components such as, feeding ngers, stone trap, and the straw guide drum, forthe proper functioning of the machine. 4.3 Initial Settings, Design Parameters, Troubles, and Remedies of Combines In the interest of the designers, research engineers, technicians, and eld men, range of design parameters associated with the operations, such as harvesting, thres