| 摘要 |
A chain drive system is provided for communicating rotation from the bottom roller of a hay conditioner to the top roller of the hay conditioner. The top and bottom rollers include longitudinally extending flutes which intermesh as the rollers rotate. The top roller is mounted for movement at each end upwardly away from the bottom roller to accommodate increased quantities of crop or obstacles. The chain drive maintains angular synchronism between the rollers despite movement of the top roller away from the bottom roller. This is achieved using a single chain wrapped around a drive sprocket on the bottom roller and around two idlers arranged at the apexes of a triangle. The driven sprocket on the top roller is located within the triangle so that the chain wraps around the drive roller into the triangle, around the driven roller and back to the idler at the apex. The top roller is mounted for pivotal movement about an axis midway between the idler sprocket and the drive sprocket and located just outside a line joining the axes of those sprockets. This location of the pivot point and the proper selection of the length of the pivot arm maintains the chain path constant despite the movement of the roller and maintains the required angular synchronism.
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