Lift cam mechanism for electronic parts mounting apparatus

摘要

An electronic parts-mounting apparatus including a rotating vertical shaft and at least one mounting head arranged around the vertical shaft has a lift cam mechanism that operates to lift and lower an associated one of the at least one mounting head as each mounting head is rotated with the vertical shaft. The lift cam mechanism includes a cylindrical cam having an annular protruding portion concentrically disposed with respect to the vertical shaft that provides upper and lower cam surfaces. Upper and lower rolling cam followers are arranged respectively on the upper and lower cam surfaces of the protruding portion to sandwich the protruding portion therebetween. One end of a support member has one of the upper and lower cam followers mounted thereon and the other end of the support member has the associated one of the at least one mounting head connected thereto. The support member has one end of a leaf spring fixed to it and the movable free end of the leaf spring has the other of the upper and lower cam followers mounted thereon, for urging the cam follower toward the protruding portion of the cylindrical cam.