| 摘要 |
PROBLEM TO BE SOLVED: To reduce a problem caused by displacement of a rotary member over which a transmission member for transmitting driving force is stretched, when the rotary member receives a load from the transmission member.SOLUTION: A transmission belt 930 is disposed so that a direction orthogonal to a direction in which a line extends connecting a contact portion (see (B)) of a driving gear 910 and a gear pulley 920, and the center of rotation of the driving gear 910, and a direction in which a tension side of the transmission belt 930 (part positioned on the upstream side with respect to stretching part where transmission belt 930 is stretched over gear pulley 920 in moving direction of transmission belt 930) extends are arranged in parallel with each other. In more detail, the transmission belt 930 is disposed along a tangential line (see (A)) which is a tangential line to an outer peripheral face of the driving gear 910 and passes through a contact part where the driving gear 910 and the gear pulley 920 are kept in contact with each other. |
