Patent ID: 8758000

Claim:
An apparatus for moulding plastic micro-pieces by ultrasound comprising: a first half-mould and a second half-mould, both being movable between a closed position in which they define a moulding cavity, and an open position; a melting chamber associated with one of said first and second half-moulds and in communication with said moulding cavity in said closed position; an inlet duct through which plastic material is fed into said melting chamber; an ultrasound vibration element associated with an ultrasound generator and provided with an end portion tightly and centrally inserted in the melting chamber through an access opening thereof; a slide driven by driving means along a guiding member for generating a relative displacement between said ultrasound vibration element and the melting chamber so that said end portion will interfere with the plastic material being fed and exert a pressure thereon of a predetermined magnitude when said ultrasound generator is activated, wherein the ultrasound vibration element is supported by adjustment means comprising at least three movable members installed in a fixed support and arranged to press on three different sides of a cylindrical surface of an intermediate piece to which the ultrasound vibration element is fixed, and driving means for individually moving each of said three movable members, wherein said adjustment means is configured to provide for the adjustment of the position of a longitudinal axis of said ultrasound vibration element in at least two cross directions perpendicular to each other and perpendicular to an axial direction parallel to a longitudinal axis of the melting chamber.