Patent ID: 6061900
Filing Date: 2000-05-16
Classification: F16H,H05K,Y10T

Abstract:
A lift cam mechanism for an electronic parts-mounting apparatus including a vertical shaft and at least one mounting head arranged around said vertical shaft, said lift cam mechanism operating to lift and lower an associated one of said at least one mounting head as each mounting head is moved about said vertical shaft, the lift cam mechanism comprising:a cylindrical cam having a protruding portion formed on a peripheral surface thereof, said protruding portion having a generally annular shape forming upper and lower cam surfaces;upper and lower cam followers arranged respectively on said upper and lower cam surfaces of said protruding portion to sandwich said protruding portion therebetween and be rollable thereon;a support member having one end and another end, said one end of said support member having at least one of said upper and lower cam followers fitted therethrough and said another end of said support member having said associated one of said at least one mounting head connected thereto; anda leaf spring having one end and another end, said one end of said leaf spring being integrally fixed to said support member and said another end of said leaf spring having at least one of said upper and lower cam followers fitted therethrough for urging said other of said upper and lower cam followers toward said protruding portion of said cylindrical cam;wherein said support member and said leaf spring are integrally formed by a single plate member opposed to said protruding portion of said cylindrical cam, said support member being a thick portion of said plate member and said leaf spring being a tongue-shaped portion of said plate member, which is formed by cutting a U-shaped cutout through said plate member and has a tip-side portion formed with a fitting portion through which said other of said upper and lower cam followers is fitted and a root-side portion being processed by grinding to a reduced thickness to form a spring portion.