| 摘要 |
<p>Band saw machines embodying this invention are especially adapted for cutting metal work pieces of extreme hardness and/or large cross-sectional size. The machines include a mechanism for oscillating or rocking the band saw relative to the work. The band saw is looped about an idler wheel and drive wheel spaced therefrom and a pair of spaced saw guide arms (20, 22) urge a span of the moving band saw (16) against the work (w). In one embodiment of the invention, an eccentric drive (18) oscillates the band saw housing (12) and drive mechanism to cause the cutting angle of the blade to vary relative to the work (w) for improved cutting efficiency and blade wear. In another embodiment, a piston (54) is provided in one of the saw guides (46) which alternatively deflects and releases the cutting span of the blade (50) to cause a variation in its angular orientation relative to the work piece (w). </p> |
