To remove the personnel from dangerous environment by providing an object positioning system for tracing the position of a lock pin moving means, a robot means for operating the lock pin moving means, and a means for separating a released vehicle.

A release system 10 operated through this positioning system 70 is so designed as to position the position in space of a coupler 24 and then to act upon the coupler 24 by a first camera 16 and a robot 12 forming a robot vision system 46, and/or a second camera 22 and a PLC 20 connected to a sensor system 68 forming a vision sensor system 44. The vision sensor system 44 finds a lock pin 32 when it comes in sight, and clamps 26, 28 are unlocked by a robot arm 14 to release the coupler 24. The release system 10 specifies the slight position fluctuation of the coupler 24, corrects the fluctuation and controls release operation on each repeated action.