Patent ID: 9696152
Date: 2017-07-04
CPC Classifications: G01B,G05B

Claim:
1. A position measuring apparatus comprising at least: an abutment unit that causes a position detecting jig fed by a feed motor to abut a measurement target; a detecting unit that detects a position of the measurement target by reading a fluctuation in a load torque of the feed motor; a load increasing unit capable of increasing the load torque of the feed motor to a predetermined first value in a state in which the position detecting jig abuts the measurement target, the first value being above a threshold that is detectable by the apparatus; a canceling unit that, when the load torque of the feed motor has become greater than or equal to the first value, cancels the abutment state between the measurement target and the position detecting jig to thereby cause a sudden drop in the load torque of the feed motor; a monitoring unit that monitors if the dropped value of the load torque has become less than a predetermined second value, the second value being less than the first value and greater than the threshold; and a capturing unit that captures position information on the position detecting jig as the position of the measurement target when the monitoring unit detects that the load torque of the feed motor has become less than the second value.