Patent ID: 6948339

Claim:
A punch assembly for producing hollow glass articles from a mass of molten glass placed in a mold, the articles having an outwardly open cavity, the punch assembly comprising: (a) a punch member for inserting in the mass of molten glass within the mold to form the cavity in the mass of glass; (b) a motor for moving the punch member to and from the mold along a substantially vertical straight axis, wherein said motor extends eccentrically with respect to said straight axis; (c) a transmission means interposed between said motor and said punch member said transmission means comprising rotary-to-linear motion conversion means: (d) a mechanical transmission interposed between said motor and said motion conversion means, said mechanical transmission comprising a ring gear driven by said motor and rotating about a rotation axis parallel to and spaced transversely apart from said straight axis; (e) a plurality of planet gears meshing with said ring gear and activating said motion conversion means, wherein said motion conversion means comprise, for each of said plurality of planet gears, a respective motion conversion assembly distinct from motion conversion assemblies of a remainder of said plurality of planet gears, and wherein each said planet gear is a straight-toothed gear and is fitted to a bottom end portion of a respective externally threaded rod parallel to said axes and connected to a relative nut screw; said punch member being carried by a slide sliding along said rotation axis; and said nut screws being connected integrally to said slide.