著者

三村 和男 山田 健

出版者

一般社団法人日本森林学会

雑誌

日本林學會誌 (ISSN:0021485X)

巻号頁・発行日

vol.72, no.6, pp.513-519, 1990-11-01

被引用文献数

1

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The forest shredder is a down-cutting type working machine equipped with many flail-type stirrup-shaped cutting blades around a horizontal shaft parallel to the brush-cutting plane. This type generally is called a flail mower. In cutting small-diameter trees of Quercus serrata THUNB. and in brush-cutting Peioblastus chino MAKINO var. using this machine, we clarified the features of both down-cutting and up-cutting types by comparatively studying the power requirements for both types. That required for cutting small-diameter trees of Q. serrata using the stirrup-shaped cutting blades of the down-cutting type is 40 to 50% greater than that by the up-cutting type. In cutting small-diameter standing trees, therefore, the power required can be reduced by using the up-cutting type. However, in the power required for brush-cutting of P. chino, no difference was seen between down-cutting and up cutting types. But the power required was 20 to 30% (Brush cutting is based on the same condition) greater than a power required for brush-cutting Sasa kurilensis MAKINO et SHIBATA var. which had been conducted previously using the stirrup-shaped cutting blades. This seem to be because the inside dimension of the stirrup-shaped cutting blade had been clogged with finely cut pieces of bamboo grass to increasing the exhaust resistance.