Patent ID: 9620926
Date: 2017-04-11
CPC Classifications: H01S

Claim:
1. A laser machining apparatus comprising: a laser oscillator; a control device configured to control the laser oscillator; a power-down detection unit configured to detect a decrease in supply power supplied to the control device and the laser oscillator from an external power source; a time measurement unit configured to measure a period of power-down time from when the supply power is decreased under the predetermined value until the supply power is returned to a predetermined value; an electricity storage unit configured to supply electric power to the control device when the supply power decreases; and an inverter provided within the laser oscillator, configure to operate abnormally when the supply power is decreased under the predetermined value, and to recover from an abnormal operation upon continuation of a state of the supply power being smaller than the predetermined value in excess of a first predetermined period of time, wherein the control device stops the laser machining apparatus or the inverter when the power-down time is smaller than the first predetermined period of time on such an occasion that the supply power returns to a value equal to or larger than the predetermined value and does not stop the laser machining apparatus or the inverter when the power-down time is equal to or larger than the first predetermined period of time on such an occasion that the supply power returns to the value equal to or larger than the predetermined value.