| 摘要 |
A system for orientation of a ring (20) by rotation, including a cable (38) engaging the ring (20) which rotates about a ring axis (X), a motor assembly (31) providing a first rotation reduction, and a stretcher (32) for stretching the cable. The system has at least one proximal pulley (34) and at least one distal pulley (36) rotating about a pulley axis (P), each pulley having grooves (40) configured for receiving the cable (38) therein. The ring is rotated by the motor assembly (31) and the pulley assembly (28) is configured to provide a second reduction of rotation to the ring (20) relative to motor rotation, whereby the ring (20) is driven via at least a double reduction of rotation relative to rotation of the motor, and the cable, the plurality of pulleys, and the ring provide a one-way mechanism. |
