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seed drill 
Farming tool that spreads and plows seeds into the soil following straight lines (furrows).
chain drive 
Distribution unit that regulates the flow of seeds into the grain tube.
colter 
Round part that cuts the furrow slice vertically.
press wheel 
Wheel that tamps the earth to plow the seeds down to a certain depth.
covering disk 
One of a pair of circular parts that work together to close up the furrow.
disk spacing lever 
Lever for changing the distance between the sowing lines.
grain tube 
Tube through which the seeds flow from the bottom of the hopper to be dropped into the furrow.
hopper 
Container that is usually shaped like an inverted pyramid; it holds the seeds to be sown.