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Portable sawmills became popular in the United States starting in the 1970s, when the 1973 energy crisis and the back to the land movement had led to renewed interest in small woodlots and in self-sufficiency. Their popularity grew exponentially since 1982, when the first Wood-Mizer portable band sawmill was invented. == History == The first portable sawmills were the "One Man Farmer's Sawmills." These mills featured large circular blades and were marketed during the early twentieth century by companies like Sears, Montgomery Ward and JC Penney. These machines were all "private label" machines manufactured by the Belsaw Company. Many early sawmills were designed to be belt-driven from a steam traction engine (which could also be used to transport the saw). Prior to the advent of the portable 'mill, small-scale sawmills were generally cobbled-together affairs constructed and operated by (almost always) two men with a penchant for tinkering. This was, and remains, a traditional occupation for Amish men; unlike most mechanical systems, small sawmills typically do not use electricity. More recently, with the invention of the Wood-Mizer in 1982, portable bandsaw mills represented a dramatic shift in design. Unlike traditional mills, they used a thin-kerf blade of the type used on a band saw rather than a circular blade, which reduced weight and cost, and reduced the size and weight of the bearings and support blocks. The smaller kerf on these blades dramatically increased the yield from a given log. Use of band blades also allowed for a different design where the ''head'', consisting of the blade and a power source, moves back and forth while the log remains stationary.〔() 〕 This is in contrast to traditional mills where the log moves on a trolley while the blade remains fixed. Aside from the original Wood-Mizer company, many companies now manufacture and sell personal and portable sawmills. Larger mills have recently come on the market which are portable only in sections. These cut faster and can handle larger logs but do require additional set up. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Portable sawmill」の詳細全文を読む スポンサード リンク
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