| 摘要 |
Apparatus including upper and lower rolls between which a supported saw extends, the lower roll having an annular groove in the periphery thereof dividing it into two annular roll sections. Pressure means connected to the upper roll is operable to move the roll to press the saw against the lower roll, and power means is connected to the lower roll to rotate the later to cause the saw to move between the rolls. The lower roll is movable axially to bring either of the annular sections or the groove thereof into position opposing the upper roll.
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