Relates to blow molding machines for the manufacture
Relates to blow molding machines for the manufacture
In one type of known blow moulding machine, an extruder and a mould are both in fixed positions. In one design, the mould is directly below the head of the extruder. This means that continuous extrusion of a tube is not possible, as extrusion can only take place when the mould is open. When the mould is closed, the extrusion process must be interrupted. In a further design, the mould is at some distance below the extruder.
In a further design of blow molding machines of this type, the extruder is movable and the mould is fixed.
The present invention provides a blow moulding machine having a movable extruder with an extruder head mounted above a blow mould wherein a guide track is provided for controlling movements of the extruder and extruder head, said guide track having an upper vertically extending section laterally displaced from a vertical axis of the mould, a lower vertically extending section providing a position for the extruder head for delivering extrudate into the mould and an inclined intermediate section connecting the upper and lower sections.
In accordance with the injection moulding machine, the mould closing mechanism is stationary and the extruder head can move with the extruder upwardly and downwardly and simultanously in a lateral direction in a fixed sinusoidal curve, which has an upper section, which is laterally displaced in relation to the mould and extends vertically, an inclined intermediate section, which leads to the mould and a lower vertically extending section, in which the tube is inserted into the mould.
According to a further feature of the plastic injection molding machine the extruder may be mounted on a bracket plate, which is attached at its upper end to a hinge movable in the vertical direction, and a guide roller mounted on the lower part of the bracket plate, engages in the guide track.
A further feature of the blow moulding machine is that an upper cross-piece is mounted vertically on the machine frame, onto which cross-piece the hinge of the bracket plate is attached, and on which a crank drive, which controls the vertical movements of the bracket plate and the extruder operates.
In one type of known blow moulding machine, an extruder and a mould are both in fixed positions. In one design, the mould is directly below the head of the extruder. This means that continuous extrusion of a tube is not possible, as extrusion can only take place when the mould is open. When the mould is closed, the extrusion process must be interrupted. In a further design, the mould is at some distance below the extruder.
In a further design of blow molding machines of this type, the extruder is movable and the mould is fixed.
The present invention provides a blow moulding machine having a movable extruder with an extruder head mounted above a blow mould wherein a guide track is provided for controlling movements of the extruder and extruder head, said guide track having an upper vertically extending section laterally displaced from a vertical axis of the mould, a lower vertically extending section providing a position for the extruder head for delivering extrudate into the mould and an inclined intermediate section connecting the upper and lower sections.
In accordance with the injection moulding machine, the mould closing mechanism is stationary and the extruder head can move with the extruder upwardly and downwardly and simultanously in a lateral direction in a fixed sinusoidal curve, which has an upper section, which is laterally displaced in relation to the mould and extends vertically, an inclined intermediate section, which leads to the mould and a lower vertically extending section, in which the tube is inserted into the mould.
According to a further feature of the plastic injection molding machine the extruder may be mounted on a bracket plate, which is attached at its upper end to a hinge movable in the vertical direction, and a guide roller mounted on the lower part of the bracket plate, engages in the guide track.
A further feature of the blow moulding machine is that an upper cross-piece is mounted vertically on the machine frame, onto which cross-piece the hinge of the bracket plate is attached, and on which a crank drive, which controls the vertical movements of the bracket plate and the extruder operates.