| 摘要 |
An idler drum mounted for rotation on one end of a swinging arm is arranged to engage opposite sides of a sanding belt and to tension it in opposite directions when the arm is swung oppositely to first and second positions; belt tracking mechanism including spring means acting to tilt the arm laterally in one direction and first and second adjustment screws each positioned and arranged to engage the arm when in one of its first and second positions to adjustably limit the tilting of the arm in the one direction or to adjustably tilt the arm laterally in an opposite direction.
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