Patent ID: 9618649
Date: 2017-04-11
CPC Classifications: B21D,G01B,G01V

Claim:
1. A method of detecting an overall dimension of a plate-shaped workpiece to be processed on a workpiece processing machine by a non-contact sensor, the method comprising: moving, by a motion device of the workpiece processing machine, the workpiece in a first predetermined direction until the sensor detects a first workpiece edge of the workpiece by a first change of state when the workpiece is moved to a first particular position in the first predetermined direction, wherein the sensor is configured to detect a presence and an absence of the workpiece and a change of state between the presence and the absence at a predetermined position of the workpiece relative to the sensor; causing first multiple reciprocal relative motions between the sensor and the workpiece with the sensor at the first workpiece edge by moving the workpiece back and forth across the first particular position, such that a change of state happens at each of the first multiple reciprocal relative motions; detecting, by an evaluation device coupled to the sensor, a first position of the workpiece associated with the first change of state and the changes of state of the first multiple reciprocal relative motions; moving, by the motion device, the workpiece in a direction toward a second workpiece edge of the workpiece until the sensor detects the second workpiece edge by a second change of state when the workpiece is moved to a second particular position in the direction toward the second workpiece edge; causing second multiple reciprocal relative motions between the sensor and the workpiece with the sensor at the second workpiece edge by moving the workpiece back and forth across the second particular position, such that a change of state happens at each of the second multiple reciprocal relative motions; detecting, by the evaluation device, a second position of the workpiece associated with the second change of state and the changes of state of the second multiple reciprocal relative motions; and then determining a first overall dimension of the workpiece by a determination of a first distance between the first position and the second position of the workpiece, wherein moving the workpiece in a direction toward a second workpiece edge of the workpiece comprises: