Sampo Rosenlew Comia c4, Instruction Book

Page: 24 / 141

– 22 –
STRUCTURE AND FUNCTIONS OF THE COMBINE
The TS Threshing Mechanism
The cutting and feeding equipment takes the crops in for threshing.
The straw dividers limit the crop to be cut and bring it within reach of the reel.
The reel, together with the crop lifters, lift the laid-down crop up and take it from the cutting knife onto the table
auger.
The table auger gathers the cut crop and feeds it onto the crop elevator, which takes the crop forward to be
threshed. Stones and other heavy objects are pushed to the stone trap thus preventing damage to the threshing
mechanism.
The threshing mechanism separates the grains from the straw.
The cut crop ¿ rst comes onto the pre-cylinder, which gently separates the most easily threshable grains and ejects
them through the pre-concave to the front of the grain pan. The pre-cylinder also evens out the feed onto the main
cylinder.
The rest of the grains are threshed off by the main cylinder and concave. Most of the threshed grain and chaff go
through the concave into the grain pan.
The rear beater and the concave extension take the threshed straw onto the straw walkers.
The separating and cleaning equipment sieves the grains.
The straw walkers separate the grains from the straw and eject the straw out to the ¿ eld from the rear of the com-
bine. The CSP ruf À ing drum placed above the straw walkers intensi ¿ es the separation of loose grains from the
straw by opening a À uf ¿ er area into the straw À ow accessory . The grains run along the bottom grooves to the
grain pan.
The grain pan takes the threshed material to the shaker shoe. The chaff and any light remains are sorted topmost
in the grain pan with the grain at the bottom.
The air stream from the fan lifts the light chaff in the air and transports it over the shaker shoe and out of the ma-
chine. Heavier grains and any partly threshed material fall through the chaff sieve. Any larger remains move out
along the sieve. Clean grain falls onto the grain auger through the grain sieve and is transported from there by the
grain elevator and
¿ lling auger to the grain tank.
The grains and occasional straw bits, which lie on the shaker shoe extension, fall to the returns course to be re-
threshed.
The chopper cuts and spreads the straw.
After the straw walkers, the straw is either discharged uncut onto the ¿ eld or taken to the chopper, which cuts and
spreads it out.