Patent ID: 6382497
Filing Date: 2002-05-07
Classification: B23Q

Abstract:
A reflow soldering apparatus comprising:a transfer conveyor for transferring a circuit board with electronic components from an entrance to an exit of the reflow soldering apparatus having a heating furnace through which the circuit board mounted is passed so as to operate reflow soldering to the electronic components on the circuit board; an exit-side circuit board detect sensor arranged at the exit for detecting that the circuit board transferred by the transfer conveyor is carried into the reflow soldering apparatus; a discharge conveyor arranged below the transfer conveyor for discharging a dropped circuit board dropped from the transfer conveyor during the transfer by the transfer conveyor from an inside to an outside of the reflow soldering apparatus; a discharge completion detector arranged at an exit side of the discharge conveyor for detecting that the dropped circuit board transferred by the discharge conveyor is discharged to the outside of the reflow soldering apparatus; and a control device which judges based on information from the exit-side circuit board detect sensor whether or not the circuit board is transferred by the transfer conveyor from the entrance to the exit, controls the discharge conveyor to discharge the dropped circuit board when judging occurrence of transfer abnormality, determines that the transfer abnormality is the drop of the circuit board when the discharge completion detector detects the dropped circuit board, and then continues the reflow soldering when determining the drop.