Patent ID: 8736459

Claim:
A control system for a back-and-forth cable system that includes a running cable, a first pulley and a second pulley, the pulleys being located at both ends of a course for guiding the running cable, a controllable motor assembly for driving one of the pulleys and a carrier connected to the running cable, the control system comprising: a first tracking device, associated with the first pulley, for generating a first tracking signal indicative of a rotation of said first pulley; a second tracking device, associated with the second pulley, for generating a second tracking signal indicative of a rotation of said second pulley; storing means for storing a first and a second limit positions along the course; and a controller having inputs for receiving the first and the second tracking signals which are representative of positions of the carrier, said controller generating a control signal to invert rotation of the controllable motor assembly when said two positions of the carrier detected respectively by the first and second tracking devices go beyond either one of the two limit positions.