| 摘要 |
Disclosed herein is a lawn mower comprising a driven pulley drivingly connected to a cutter blade located in a blade housing, an endless belt reeved around a drive pulley and the driven pulley, an idler pulley mounted for rotation on an arm mounted for movement relative to a neutral position with the idler pulley disengaged from the belt, a first spring urging the arm from the neutral position so as to engage the idler pulley with the belt to remove slack therefrom, a control linkage movable between a drive position and a neutral position, another spring biasing the control linkage toward the neutral position, and a connection between the linkage and the arm for displacing the arm to the neutral position against the action of the first spring when the control linkage is in the neutral position and for permitting movement of the arm, under the influence of the first spring and independently of the second spring, from the arm neutral position so as to engage the belt to remove slack therefrom when the control linkage is in the drive position.
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