Preheating mechanism of jet soldering apparatus, and jet soldering apparatus

A preheating mechanism of a jet soldering apparatus for preheating a soldering position of a printed circuit board and its periphery, associated with a soldering apparatus for partially soldering the soldering position of the printed circuit board by drawing up a molten solder from a jet nozzle, at least comprising:

• one or more electromagnetic coils;
• a mounting unit for mounting the one or more electromagnetic coils at a periphery of the jet nozzle;
• and
• an alternating current power source and a controller for flowing an alternating current to the one or more electromagnetic coils and for controlling on/off of the alternating current,
• wherein the mounting unit is arranged at a position that the soldering position of the printed circuit board and its periphery can be preheated by an electromagnetic induction heating using the one or more electromagnetic coils, and a timing of heating, a heating time, and a power applied to the one or more electromagnetic coils are controlled by the alternating current power source and the controller, and a soft ferrite core is applied to the one or more electromagnetic coils, and the soft ferrite core is formed in a U shape with a groove, and an electromagnetic coil of the one or more electromagnetic coils is embedded and wound in the groove, and the core in U shape is arranged at one or more positions around the jet nozzle.

A jet soldering apparatus comprising the preheating mechanism according to any of claims 1, 3, 4, 6 and 7, the jet soldering apparatus comprising:

• a work supporting means for supporting a work in which a plurality of soldering positions are dispersed;
• a jet nozzle for ejecting a molten solder to a soldering position of the plurality of soldering positions;
• a preheating mechanism arranged at a periphery of the jet nozzle;
• and
• an access means in which respective distances from the jet nozzle to the plurality of soldering positions are moved closer when automatic soldering is performed and the respective distances are moved away while waiting.