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1. A machine for applying a coating product to screws, particularly the threaded shaft of a screw, with a coating product, comprising:
a support frame in reference to which an operating space through which the screws are advanced along a preset path of travel extending from one inlet end to one outlet end of said operating space is identifiable; a feed ramp unit for feeding said screws into said operating space, said feed ramp unit being located at said one inlet end upstream from said operating space, as viewed in a forward direction of travel of said screws, along said preset path of travel, said feed ramp unit having support points defined therein for supporting said screws with the shaft extending in a first direction perpendicular to said path of travel; dispensing/spreading means supported in said operating space and extending along said preset path of travel between said one inlet end and said one outlet end, for applying a coating product to the shafts of the screws traveling through said operating space; advancing means supported in said operating space and operating along said preset path of travel between said one inlet end and said one outlet end, for driving the screws in said operating space, and abutment means supported in said operating space for defining an abutment and positioning plane for said screws along said path of travel as said screws are advanced from said one inlet end to said one outlet end,wherein:
said abutment means are supported by said support frame and include a bearing blade longitudinally extending from said one inlet end to said one outlet end parallel to the path of travel to support a portion of the shaft of the screws that travel through said operating space along said path of travel; said bearing blade defines an abutment and positioning surface for abutment of the underhead region of the screws traveling through said operating space along said path of travel; said feed ramp unit comprises a stationary portion longitudinally extending along said feed ramp unit and supported by said support frame in joined relationship with said bearing blade; said stationary portion of said feed ramp unit is an extension of said bearing blade and said path of travel for supporting a portion of the shaft of the screws traveling through said feed ramp unit; said stationary portion of said feed ramp unit defines an abutment and positioning surface for abutment of the underhead region of the screws traveling through said feed ramp unit, the adjacent facing end portions of said bearing blade and said stationary portion of said feed ramp unit extending coplanar with each other, said bearing blade and said stationary portion of said feed ramp unit defining, in said machine, a fixed surface relative to said support frame, for abutment and positioning of the screws in the section upstream from said operating space, and in said operating space, said dispensing/spreading means are supported by said support frame through first adjustment means suitable to allow mutual position adjustment of said dispensing/spreading means relative to said bearing blade in said first direction perpendicular to said path of travel; and said advancing means are supported by said support frame through second adjustment means suitable to allow mutual position adjustment of said advancing means relative to said bearing blade in said first direction perpendicular to said path of travel.
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