System and corresponding automatic machine for assembling and shaping circular brushes

A method for assembling and shaping circular brush semi-finished products along an assembly line, in which each semi-finished product comprises:

• a circular ring nut having an axis;
• a first circumferential side, a substantially cylindrical central portion, a second circumferential side, and a central axial hole, wherein the said two circumferential sides form a circumferential channel of a “U” section;
• a ring disposed between the said two sides of the said finished ring nut, and disposed coaxial with the ring nut;
• and
• a plurality of bristles which are distributed circumferentially and project radially outwardly and are disposed in the shape of a “V”, with a vertex inside the said “U”-section channel, and with the ring disposed in the vertex of the “V”;
• said method comprising the steps of:
• (a) providing a folded circular ring nut, which extends axially along a respective ring axis and has a conical front profiled section which diverges towards a rear direction, a central cylindrical portion, an inclined rear circumferential side which diverges towards the rear direction, and a central axial hole fitted onto a ring nut-holder unit with a conical front head, the axis of the said ring nut being disposed coaxially with said assembly line;
• (b) disposing said ring slightly in front of said folded ring nut and coaxially therewith;
• and
• (c) inserting a plurality of bristles in a circumferentially distributed manner between the inner circumference of the said ring and an outer circumference of the said head, and thus on the outer circumference of the said folded circular ring nut, until a specific length of bristles is obtained downstream from the said ring.