Electronic-part surface mounting apparatus

An electronic-part surface mounting apparatus, comprising:

• an S-Z shaft vertically movable with respect to a mounted surface of a printed circuit board and rotatable in a plane parallel to said mounted surface;
• an arm member revolving around said S-Z shaft;
• a plural number of Z shafts, supported by said arm member, being vertically movable with respect to said mounted surface;
• cam means revolving around said Z shafts to cause said Z shafts to individually move in a reciprocating manner;
• an absorption nozzle attached to a lower end of each of said Z shafts;
• and
• attraction/mounting means operating such that at a position where said Z shafts come near to said mounted surface, said attraction/mounting means releases a mounted part from its seizure by said absorption nozzle, and mounts said mounted part on said mounted surface,
• said attraction/mounting means including:
• a negative pressure source being operable in a negative pressure mode;
• and
• a selective pressure source being selectively operable in the negative pressure mode and a positive pressure mode;
• wherein said Z shafts are selectively connected to said negative pressure source and said selective pressure source in accordance with a reciprocating movement of said shafts such that said Z shafts are connected to said negative pressure source when said Z shafts are moved apart from said mounted surface and is connected to said selective pressure source when said Z shafts come near said mounted surface, said selective pressure source being switched from said negative pressure mode to said positive pressure mode while said Z shafts are moved apart from said mounting surface to be connected to said negative pressure source so that a vacuum state of said Z shafts is removed to mount said mounted part.