| 摘要 |
A method to strain a sawing device blade (1) made of magnetic material to a chosen sawing line and to steer it to stay on said line. By means of elements (6), a sawing tightness is strained to blade (1) in moving said blade sidewise to the chosen sawing line, the said sawing line is formed in a sawing portion between said elements (6), and by means of said elements (6), blade (1) is continuously effected during sawing in order to adjust the portion intended for the sawing line of blade (1) to stay on the said sawing line.
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