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head saw
A head saw, framesaw, gang saw or head rig, is the saw that makes the initial cuts in a log at a sawmill, turning a log into cants, or planks of wood.
==History==
The original powered head saw was composed of long, narrow blades that used an up-and-down motion, a reciprocating saw. Each blade was set at a fixed width meaning each log was cut identically, regardless of flaws. This design was not energy efficient and around 1860 sawmills began to adopt the more efficient circular saw. In the 1870s, the limitation of log size due to the radius of the circular saw was improved with the introduction of the double circular saw- with one blade atop the other. In the 1880s, the band saw was introduced and was able to allow the head saw to handle logs of nearly unlimited size, ideal for the Californian redwoods.
〔The Loggers, Williams, Richard L., Time Life Books, 1976, ISBN 0-8094-1527-5〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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