| 摘要 |
PROBLEM TO BE SOLVED: To press a tension roller against a side where loosening of a driving belt occurs always irrespective of the direction of rotation of a driving pulley. SOLUTION: Two arm parts are integrally formed to form a V shape, and a bracket 11 in which tension rollers 12a, 12b are rotatably attached to tips of both arm parts is rotatably attached to a driving shaft 5 of the driving pulley 15. When a driving shaft 5 rotates in the counterclockwise direction, the bracket 11 rotates in the same direction to press the tension roller 12a on an arm side on one side against the driving belt 3 and give tension. When the driving shaft 5 rotates in the clockwise direction, the bracket 11 rotates in the same direction to press the tension roller 12b on an arm side on the other side against the driving belt 3 and give tension. COPYRIGHT: (C)2006,JPO&NCIPI
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