Electronic part mounting device

An electronic component mounting apparatus comprising:

• a rotary table capable of being intermittently driven about a central axis;
• a plurality of pickup nozzles disposed along a periphery of the rotary table so as to be movable up and down;
• a cylindrical cam disposed inside of the rotary table and positioned so as to be coaxial with said rotary table, said cylindrical cam having an upper cam groove and a lower cam groove formed in an outer peripheral surface of the cylindrical cam for effecting up and down movement of the pickup nozzles in response to intermittent rotation of the rotary table;
• a first roller attached to one of the pickup nozzles and disposed within the lower cam groove;
• a second roller attached to the one pickup nozzle and disposed within the upper cam groove;
• and
• a spring for biasing the first roller into contact with a lower side surface of the lower cam groove, and for biasing the second roller into contact with an upper side surface of the upper cam groove.

An electronic component mounting apparatus comprising:

• a rotary table capable of being intermittently driven about a central axis;
• a plurality of pickup nozzles units disposed along a periphery of the rotary table so as to be movable up and down;
• and
• a cylindrical cam disposed inside of said rotary table and positioned so as to be coaxial with said rotary table, said cylindrical cam having a cam groove formed in an outer peripheral surface of the cylindrical cam for effecting up and down movement of the pickup nozzle units in response to intermittent rotation of the rotary table,
• wherein each of said plurality of pickup nozzle units comprises:
• a first roller disposed within said cam groove;
• a second roller disposed within the cam groove, wherein movement of the first and second rollers along the cam groove causes the respective pickup nozzle unit to move up and down;
• and
• a spring assembly for biasing the first and second rollers into contact with first and second side surfaces of the cam groove, respectively.