US Patent No. 9,348,330

METHOD OF ADJUSTING THE POSITION OF ORIGIN OF A MACHINE AND A MACHINE HAVING A FUNCTION FOR ADJUSTING THE POSITION OF ORIGIN


Patent No. 9,348,330
Issue Date May 24, 2016
Title Method Of Adjusting The Position Of Origin Of A Machine And A Machine Having A Function For Adjusting The Position Of Origin
Inventorship Hiroyuki Abe, Minamitsuru-gun (JP)
Assignee FANUC Corporation, Minamitsuru-gun, Yamanashi (JP)

Claim of US Patent No. 9,348,330

1. A method of adjusting the position of mechanical origin of a machine having a moving part that is driven by a servo motor
equipped with a position detector, comprising the steps of:
moving said moving part in a predetermined direction to position said moving part at the position of mechanical origin;
reading a value of a reference counter that counts the value detected by said position detector and that is preset to a determined
value for every rotation of the servo motor, at a moment when said moving part is positioned;

reading a counter capacity of said reference counter; and
calculating the amount of adjusting said position of mechanical origin based on the value of the reference counter of when
said moving part is positioned and on the capacity of the reference counter,

wherein of the value of the reference counter is smaller than one-half the counter capacity, the amount of adjusting the position
of origin is set to the value of the reference counter, and if the value of the reference counter is not smaller than one-half
the counter capacity, a deviation obtained by subtracting the counter capacity from the value of the reference counter is
set as the amount of adjusting the position of origin.