Method of adjusting the position of origin of a machine and a machine having a function for adjusting the position of origin

A machine having a function for adjusting the position of mechanical origin of a moving part that is driven by a servo motor equipped with a position detector, comprising:

• a reference counter for counting the value detected by said position detector;
• the reference counter being preset to a determined value for every rotation of the servo motor;
• a storage unit for storing the capacity of the reference counter of when said moving part is moved in a predetermined direction and is positioned at the position of mechanical origin;
• a reference counter reading unit for reading the value of said reference counter of when said moving part is positioned;
• a counter capacity reading unit for reading the counter capacity of said reference counter;
• and
• an adjustment amount calculation unit for calculating the amount of adjusting said position of mechanical origin based on the value of the reference counter 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 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.