| 摘要 |
PURPOSE:To adjust a feeding quantity of heat with simple operation by dividing plural heaters into two sets and making them controllable independently. CONSTITUTION:A pressure adjusting valve 13 is adjusted so as to attaining to a specific flow amount by opening 1st, 2nd solenoid valves 10, 11. When an electric power is fed to three heaters 3, 3', 3'' in this state, a hot air is blasted from the flowout ports of the heaters 3, 3', 3''. This air blast generates a vortex with its confluence after colliding once with the funnel part 4 of a nozzle 6 after passing through a temp. detector, blasting with stirring each other. A lead piece only is thus heated selectively and the solder on the board opposing thereto is melted. In this process, a control circuit 15 adjusts the hot air temp. so as to attain to the set value by reducing the electric power to the heaters 3, 3', 3'' when the temp. of the hot air exceeds the set value. |
