Plastic article or earthenware shaping or treating: apparatus – Mold opening and closing means and segmented female mold – Rack and pinion
Patent
1994-09-22
1996-10-08
Chiesa, Richard L.
Plastic article or earthenware shaping or treating: apparatus
Mold opening and closing means and segmented female mold
Rack and pinion
425532, 425541, B29C 4956
Patent
active
055629342
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention refers to a blow molding machine designed as two-station machine including at least one extrusion device, possibly with accumulator head, which supplies a tubular thermoplastic parison to two blow molds arranged next to each other and having two horizontally movable blow mold halves, and a machine frame upon which the two blow molds or four blow mold halves are slidably supported.
Such a two-station blow molding machine is generally known per se. The known machine is provided with a complex encircling frame structure with four bars and additional external support of the drive unit as five-platen-system. This incurs significant initial costs, requires a need for large space and necessitates a complicated control of two separate closing devices.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an efficient two-station blow molding machine which enables a high productivity at low initial costs and operating expenses and at reduced demand for space. In accordance with the invention, this object is attained by providing only one three-platen system with three mold mounting plates for clamping the four blow mold halves, with one blow mold half of each of both blow molds being affixed to the central mold mounting plate. The central mold mounting plate thus carries one blow mold half on each side to the right and to the left.
A proper handling of the machine with unrestricted product removal capability and no obstructing cross bars is advantageously attained by designing the machine frame only in form of a table which is exclusively arranged underneath the blow mold halves and mold mounting plates. The horizontal movement and rapid feed-closing movement of both blow mold halves is thereby provided in an amazingly simple manner by only one single driving cylinder, the piston rod of which is mounted at both sides to the machine frame while the final locking motion of the respective blow mold halves to their final locking position is effected by providing each mold mounting plate with separate locking units comprised of small locking cylinders with opposing locking pins. For smaller products like e.g. a 10I canister, it is sufficient to provide in the center of a respective blow mold at half height two neighboring closing cylinders with locking pins (as shown in the drawings). For larger blow molding products (e.g. a 220 I drum) and at larger blowing pressures and prevailing forces, all four corner areas of each mold mounting plate are provided with the respective closing cylinders and locking pins.
In accordance with an embodiment of the invention, the single driving cylinder is operatively connected with the respective blow mold halves to be actuated via a coupling, preferably in form of a hydraulic cylinder with pinion engageable and shiftable in the racks of the synchronizing devices. Thus, in a most simple way, a 2-station blow molding machine can be made available with an operationally advantageous motion system.
The three-platen system according to the invention provides the following advantages: power system is respectively provided within each mold mounting plate; or repair works, forces at fast feed motions, production hall,
A particular feature is the complete mobility of the entire two-station blow molding machine, for example via rails in the foundation and wheels underneath the base frame of the machine. Suitably, the moving wheels for the entire machine unit are equipped with a separate drive motor. This embodiment is in particular very advantageous when replacing molds or dies because the accessibility is considerably improved.
BRIEF DESCRIPTION OF THE DRAWING
The invention is now explained and described in more detail with reference to an exemplified embodiment illustrated in the drawings, in which
FIG. 1 shows a two-station blow molding machine according to the invention,
FIG. 2, 3 and 5-9 show various positions of a two-station blow molding machine,
FIG. 4 shows a schematic illustration of the synchronizing device of the b
REFERENCES:
patent: 3576048 (1971-04-01), Stanley
patent: 3636151 (1972-01-01), Nagai
patent: 3860375 (1975-01-01), Kinslow, Jr. et al.
Humrich Uwe
Langos Peter
Chiesa Richard L.
Feiereisen Henry M.
Mauser-Werke GmbH
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