cutter bar

noun

Also called sickle bar. (in a mower, binder, or combine) a bar with triangular guards along which a knife or blade runs.
a bar holding the cutting tool in a boring machine or lathe.

Origin of cutter bar

First recorded in 1865–70

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

It had open guard fingers, a knife made of triangular sections, reciprocating in the guard, and a cutter-bar on a hinged frame.
Inventions in the Century | William Henry Doolittle
When the cutter-bar of the mower is tilted upward, the danger of smothering is reduced.
Crops and Methods for Soil Improvement | Alva Agee
The knives are set at an angle to the axis of the cutter bar or cutter head.
Modern Machine-Shop Practice, Volumes I and II | Joshua Rose
The cutter bar, suggestive of Hussey's, has triangular knives which vibrate over long fingers.
Agricultural Implements and Machines in the Collection of the National Museum of History and Technology | John T. Schlebecker
A second clipping will be required later, with cutter-bar tilted well upward.
Crops and Methods for Soil Improvement | Alva Agee

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