DRIVEN MEMBER POSITIONER

摘要

In one aspect, a method of operating a movable barrier operator includes engaging a flexible driven member with a drive of the movable barrier operator. The method includes moving the flexible driven member in a first direction to move a movable barrier connected to the driven member and monitoring the position of the movable barrier. In response to the movable barrier reaching a given position, the driven member is moved in a second direction without moving the movable barrier to remove slack from the driven member. In another aspect, a movable barrier apparatus includes a movable barrier controller operatively coupled to a movable barrier operator. The movable barrier controller is configured to cause the movable barrier operator to reverse direction of a flexible driven member a distance after stopping movement of a movable barrier toward a limit position and without moving the movable barrier.