| 主权项 |
1. A belt-type grinding tool comprising:
a tool body; a drive pulley provided in the tool body and rotationally driven by a motor; an idler pulley provided at a position separated forward from the drive pulley to stretch an endless grinding belt between the idler pulley and the drive pulley; a pulley support bar having a front end portion rotatably supporting the idler pulley, the pulley support bar extending rearward from the front end portion and being supported by the tool body; a spring urging the pulley support bar forward relative to the tool body, thereby causing the idler pulley supported by the pulley support bar to press the endless grinding belt forward to apply a tension to the endless grinding belt; and a spring support member movably attached to the tool body, the spring support member being movable between a first position where the spring support member supports the spring in such a manner that the spring is compressed between the spring support member and the pulley support bar to apply a tension to the endless grinding belt, and a second position where the spring support member is displaced from the first position to reduce an amount of compression of the spring to reduce the tension. |
