| 摘要 |
A drive assembly (100) comprises: a strip (112) arranged in a continuous loop and associated with at least one row of driving members (162) spaced longitudinally along the loop; at least one support (116) around which the strip (112) is wrapped with the or at least one of the supports (116) being associated with at least one series of circumferentially spaced driving members (164) for location sequentially with adjacent ones of the driving members (162) associated with the strip (112); and an electric multi-phase stepper motor for driving said or said at least one of the supports (116) and thus moving the strip (112); the arrangement being such that the number of steps of the motor needed to move the strip (112) a distance equal to the distance between adjacent ones of the driving members (162, 164) when divided by the number of phases of the motor is an integral number. |
