Patent ID: 7558645
Filing Date: 2009-07-07
Classification: G05B

Abstract:
1. An overhead travelling carriage system, comprising: an overhead travelling carriage having a platform, a teaching unit supported by said platform, including a height sensor and a horizontal plane position sensor on a bottom portion of said teaching unit, said teaching unit is lowered toward a load port to teach a position of the load port to the overhead travelling carriage, said height sensor uses a pin on the load port to determine a height position of the load port, said horizontal plane position sensor determines a horizontal plane position of the pin on the load port, the height sensor determines the height position of the load port by coming into contact with the pin on the load port, and when the height sensor contacts the pin, the platform is raised to cause the teaching unit to break contact with the load port before the horizontal plane position sensor determines the horizontal plane position of the pin.