Combine harvester

**Historical Development**:
– Reverend Patrick Bell designed a reaper machine in Scotland in 1826.
– Hiram Moore patented the first combine harvester in the United States in 1835.
– John Ridley and others developed the stripper in Australia in 1843.
– Hugh Victor McKay created a successful combine harvester in 1885.
– The Holt Manufacturing Company produced a self-propelled harvester in 1911.
– Combines were initially drawn by mule or horse teams and later powered by steam.
– Tractor-drawn combines became common post-World War II.

**Technological Advancements**:
– Lyle Yost invented an auger for easier grain unloading in 1947.
– Claas launched the first self-propelled combine harvester in Europe in 1952.
– Rotary combines were introduced in 1975 by Sperry-New Holland.
– On-board electronics were introduced in the 1980s for measuring threshing efficiency.
– Modern combines have nearly 800 engine horsepower and headers up to 60 feet wide.
– Self-cleaning rotary screens were invented in the mid-1960s to prevent overheating.

**Combine Header Types**:
– Headers are designed for specific crops and are removable.
– Standard headers have a reciprocating knife cutter bar and a revolving reel.
– Flex platforms can cut soybeans and cereal crops over contours.
– Draper headers use fabric aprons for faster feeding.
– Dummy heads or pick-up headers feature spring-tined pickups.

**Operational Features**:
– Conventional combine operation involves a threshing mechanism consisting of a rotating drum.
– Hillside combines utilize hydraulic leveling systems for steep terrain.
– Sidehill combines are designed for gentle rolling slopes.
– Continuously variable transmissions allow for varying ground speed while maintaining constant engine and threshing speed.
– Specialized corn heads are equipped with snap rolls to improve efficiency.

**Economic Impact and Safety**:
– Combine harvesters significantly reduced the agricultural workforce.
– The invention of combine harvesters revolutionized grain crop harvesting.
– Modern combines are capable of harvesting various crops efficiently.
– Combine harvesters have become essential in modern agricultural practices.
– Combine fires cause significant financial losses annually, with preventive measures including reducing static electricity and using synthetic greases.