| 摘要 |
PROBLEM TO BE SOLVED: To restrain a tilting range of a gas torch to a cutting object member from being limited when cutting the cutting object member, by automatically, easily and surely executing ignition for generating a preheating flame from mixed gas jetted from a nozzle tip of the gas torch and its ignition detection.SOLUTION: A gas-cutting device comprises: a gas torch 2; a torch holder for holding the gas torch 2; an ignition mechanism 6 for igniting for generating the preheating flame from the mixed gas of combustible gas and oxygen gas; an ignition detection mechanism 7 for detecting the ignition via combustion heat of the preheating flame; and a first advance-retreat movement mechanism 8 equipped in an installation member fixed to the torch holder and integrally advancing-retreating the ignition mechanism 6 and the ignition detection mechanism 7 over an advancing position where the ignition mechanism 6 can ignite the mixed gas and the ignition detection mechanism 7 can detect the ignition and a retreating position for retreating the ignition mechanism 6 and the ignition detection mechanism 7 in the direction for keeping away to the nozzle tip 2a of the gas torch 2 from the advancing position. |
