| 摘要 |
PURPOSE:To make it possible to obtain a post-purge time which matches the combustion time and prevent a feeling of cold air flow and abnormal heating of the tool body by detecting the combustion time and using the calculated value of that combustion time as a post-purge time. CONSTITUTION:The state of combustion is converted into electric signals by a combustion sensor 30 and they rare sent to a combustion detection section 31. The combustion detection section 31 outputs to a combustion timer 32 only when combustion is judged by the electric signal from the combustion sensor 30 and make the timer 32 count the combustion time. An operation section 33 calculates the value of the combustion timer 32 and makes a delay timer 34 count the post-purge time which matches the combustion time. Next, if an operation switch 23 is opened, the combustion control section 25 receives the signal of opened state of the operation switch 23 ans stops a solenoid valve 27. When the operation switch is opened, the delay timer 34 outputs an operation signal to a fan motor control section 29 during the post-purge which is calculated during the operation switch 23 is closed so that regardless the ON/OFF state of the operation switch 23 a fan 17 for sending air is rotated for a certain time corresponding to the combustion time. |
