A METHOD FOR RETURNING A WORK-HEAD TO HOME POINT IN A 2-AXIED POSITIONING CONTROLLER

摘要

Disclosed is a method to regress an original point for two-axis location controller. In the method, a driving object(4) moves to negative(-) direction to reach to the original point switch(2). The original point signal indicating that the driving object(4) has been reached to the original point switch(2) is inputted. The driving object(4) moves to positive(+) direction so that the original point signal is in "off" state. The original point is sensed when the original point signal is in "off" state. Thereby, original point can be searched without data of distance between the original switch and a limit switch of negative(-) direction.