| 摘要 |
A dual idler structure of an elliptical trainer can tighten a transmission belt, without easily causing the belt to be slipped upon rotating clockwise or counterclockwise. By operating an upper and a lower stopping bolt to abut an upper and a lower idler set, resilience to the idler sets by the transmission belt upon rotating clockwise or counterclockwise is prevented, such that the belt is prohibited from being easily slipped.
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