| 摘要 |
PURPOSE:To get rid of extension contraction difference of a chain by a rotational phase angle of a sprocket, minimize tensile force applied on the chain itself to the utmost so as to provide smooth operation. CONSTITUTION:In order keep a winding angle theta of a chain 2 on a sprocket 1 constant, a guide cam 4 arranging its one end in contact with a specified position of the sprocket 1 and having a groove to guide a roller 2b by way of releasing the roller 2b from the sprocket 1 is provided, and a travel track of the chain 2 is kept constant regardless of a rotational phase of the sprocket 1. |
