| 摘要 |
PURPOSE:To prevent the generation of solder defects by providing spirals advancing upward at the time of rotation of a driving shaft on the outer periphery of this driving shaft. CONSTITUTION:Molten solder S is stored in a solder storage tank 1. The driving shaft 2 is inserted into the storage tank 1 from above the liquid surface of the molten solder S to drive a pump means 3. A solder jet is formed by using a jet forming cylinder 5 in the position upper than the liquid surface by the pump means 3. A work (lead frame) 6 is soldered by using a soldering roller 7 via the solder jet. The spirals advancing upward at the time of the rotation of the driving shaft 2 are provided on the outer periphery of the shaft. The sticking or stagnating of oxides around the driving shaft is prevented in this way.
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