ISO 8909-1:2021 pdf download – Equipment for harvesting — Forage harvesters — Part 1: Vocabulary.
4 Terms related to characteristics of functional components 4.1 crop-gathering header device, usually detachable, used to gather the crop into the forage harvester (3.1) 4.1.1 row crop header device used to cut off and gather row crops, usually near ground level 4.1.2 maize picker header device used to harvest and gather only ears of maize (corn) 4.1.3 pickup header device for picking up previously cut crop Note 1 to entry: The crop may be in a swath or windrow. 4.1.4 direct-cut header device capable of cutting unharvested crop across its full width and conveying the cut crop directly into the forage harvester (3.1) 4.2 header cutting mechanism device used on the header to cut off the standing crop from its root system 4.2.1 cutterbar cutting device which uses one or two reciprocating components (e.g. sickle, knife) to cut off the standing crop 4.2.2 rotary impact cutter rotary cutting device using high-velocity knives driven about a vertical or horizontal axis to cut off the unsupported standing crop by impact alone 4.2.2.1 disc cutter multiple disc mechanism using two or more blades per disc driven about vertical axes from below at sufficiently high rotational frequencies to achieve impact cutting 4.2.2.2 drum cutter device using multiple large discs each with a central drum and driven about vertical axes from above or below at sufficiently high rotational frequencies to achieve impact cutting Note 1 to entry: Each disc has at least two knife blades which protrude outwards from beneath the peripheral edge.
4.2.2.3 flail? cutter device using multiple, radially attached blades that are mounted to pivot on a horizontal rotor Note 1 to entry: Each blade has a transversely cutting edge to cut off crop by impact. Note 2 to entry: The rotor is positioned transverse to the direction of travel. 4.2.3 rotary disc disc on the head row unit used to shear off the crop Note 1 to entry: There are two systems: the one-disc rotary knife system requires a stationary knife against which to shear the crop, and the two-disc rotary knife system requires either a stationary knife or discs that are overlapped and rotated in opposite directions such that the crop is sheared off at the forward intersection of the two disc peripheries. 4.2.4 oscillating scissor knife device consisting of one pivoting knife with two stationary knives per row crop head row unit Note 1 to entry: The knife reciprocates in a semi-circular arc and cuts the crop off against one of two stationary knives. 4.2.5 unidirectional cutterbar device for cutting off stalks comprising a horizontally arranged chain or belt carrying protrusions which guide and shear the stalks against spaced stationary supports 4.3 feedroll one or more cylindrical rolls, generally with protrusions or flutes, used to gather, compress and advance the crop into the cutterhead (4.4) 4.4 cutterhead cutting rotor devices intended to cut the crop into short lengths with reasonable consistency within a range of optional settings
4.7 smasher impact attachments protrusions attached either to the cutterhead knives or blower paddles, and/or to the cutterhead or blower housing band used primarily to break whole grains or maize (corn) kernels into smaller pieces either by impact or by shearing 4.8 crop processor driven pair of opposing, counter-rotating rolls or discs placed in the chopped crop stream flow to crush whole grains or kernels into smaller pieces 4.9 inertial chamber chamber with special bottom mounted in the lower part of the cutterhead housing, into which chopped material (maize) is directed and then inertially reversed to the cutterhead housing for re-chopping 4.10 random‐cut? flail? chopping? rotor <cutterhead> multiple flails with transverse cutting edges at their tips, pivotably attached to a rotor positioned transversely to the direction of travel and parallel to the ground Note 1 to entry: The swath, windrow or standing crop is cut directly by the flail blades into shorter random lengths by impact cutting or cutting against an adjustable element (stationary knife) on the chopping rotor periphery. 4.11 crop delivery device mechanism used to propel the chopped crop from the forage harvester through a converging duct or chute to the transport container.
