Tool changer
AssigneeFanuc Corporation
InventorYasuyuki YAMAMOTO
Life of this patent
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Abstract
In order to provide a tool changer that can detect an entry of a foreign substance into a turret mechanism portion or wear of a turret mechanism part, a tool changer of the present invention includes a reference phase false detection sensing portion that monitors load variations which occur in a turret drive source and detects an entry of a foreign substance into the turret mechanism portion based on a difference between the load variations and a reference load used as a reference. Moreover, the reference phase false detection sensing portion can also detect the progress of wear of the turret mechanism part based on the integral of the absolute value of a difference between the load variations which occur in the turret drive source and the reference load used as a reference.
Claims2
A tool changer of a machine tool that performs tool indexing by turning a turret by a transfer mechanism that transfers an output of a turret drive source, the tool changer comprising:
- a load variation mechanism that varies a load of the turret drive source in a predetermined phase during turning of the turret;
- a load detecting portion of the turret drive source, the load detecting portion detecting the load of the turret drive source which is varied by the load variation mechanism;
- a turret, turning motion reference load storing portion that stores the load of the turret drive source during turret turning motion in a state in which no difference is caused between a phase of the turret which is recognized by a controller of the machine tool and an actual phase of the turret;
- a difference calculation portion that calculates a difference between the detected load and a stored reference load;
- a threshold value setting portion that sets a threshold value;
- and
- a reference phase false detection sensing portion that determines a possibility of false detection of a reference phase if the difference calculated by the difference calculation portion has exceeded the threshold value.
A tool changer of a machine tool that performs tool indexing by turning a turret by a transfer mechanism that transfers an output of a turret drive source, the tool changer comprising:
- a load variation mechanism that varies a load of the turret drive source in a predetermined phase during turning of the turret;
- a load detecting portion of the turret drive source, the load detecting portion detecting the load of the turret drive source which is varied by the load variation mechanism;
- a turret turning motion reference load storing portion that stores the load of the turret drive source during turret turning motion in a state in which no difference is caused between a phase of the turret which is recognized by a controller of the machine tool and an actual phase of the turret;
- a difference calculation portion that calculates a difference between the detected load and a stored reference load;
- an integral-of-difference calculation portion that evaluates an integral of a value of the difference;
- a threshold value setting portion that sets a threshold value;
- and
- a reference phase false detection sensing portion that determines a possibility of false detection of a reference phase if the integral evaluated by the integral-of-difference calculation portion has exceeded the threshold value.
Dependencies are inferred from the claim text.