Blow moulding machine

Details Blow moulding machine Blow moulding machine

1999-01-25

2000-11-28

Davis, Robert

Plastic article or earthenware shaping or treating: apparatus

Female mold and means to shape parison directly by internal...

With heating or cooling means

425534, 425540, B29C 4936, B29C 4964

Patent

active

061527238

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention refers to a blow moulding machine for forming hollow bodies such as bottles.


BACKGROUND OF THE INVENTION

Such blow moulding machines are known in various embodiments, the preforms and the finished hollow bodies, such as bottles, being transported directly (GB 2 074496 A) or indirectly (DE 27 42 693 C2) with the aid of loose mandrels. In any case, the heating wheel and the blow wheel rotate side by side in a common horizontal plane; if necessary, an intermediate transfer device is used for the heated preforms. This inevitably results in a structural design occupying a large floor space and taking up much room. The integration of a known blow moulding machine in a filling plant for bottles or the like, which is more and more realized in practice in order to achieve a reduction of costs, or even the subsequent incorporation into an existing filling plant is therefore much more difficult.


SUMMARY OF THE INVENTION

It is the object of the present invention to substantially reduce with the aid of simple means the amount of space required for a blow moulding machine of the type mentioned at the beginning.
Depending on the degree to which the blow wheel and the heating wheel overlap, the floor space of the blow moulding machine according to the present invention is reduced to a greater or lesser degree without impairing the function of the machine. The slight increase in the overall height does not have any negative effects at the locations where such blow moulding machines are normally installed. The smallest possible floor space is achieved when the blow wheel and the heating wheel cover each other completely and rotate preferably concentrically and directly on top of each other. This also results in a considerable reduction of the manufacturing costs due to a corresponding reduction of the number of components used for the machine frame.


BRIEF DESCRIPTION OF THE DRAWINGS

In the following, two embodiments of the present invention will be described making reference to the drawing, in which:
FIG. 1 shows a side view of a first embodiment of a blow moulding machine,
FIG. 2 shows a top view of the blow moulding machine according to FIG. 1,
FIG. 3 shows section AA according to FIG. 1,
FIG. 4 shows an enlarged top view of the transfer device of the blow moulding machine according to FIG. 1 to 3,
FIG. 5 shows section BB according to FIG. 4,
FIG. 6 shows a vertical section through a second embodiment of a blow moulding machine in the area of the transfer device,
FIG. 7 shows a top view of the upper rotor of the transfer device according to FIG. 6,
FIG. 8 shows the side view of the central rotor of the transfer device according to FIG. 6,
FIG. 9 shows the top view of the lower rotor of the transfer device according to FIG. 6,
FIG. 10 shows the schematic representation of the blow moulding machine according to FIG. 6 to 9.


DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

A blow moulding machine according to FIG. 1 to 5 is equipped for producing bottles 2 for beverages from injection-moulded preforms 1 consisting of a thermoplastic material, e.g. PET. It comprises a frame 8 composed of steel sections and having a boxlike basic shape, said frame 8 being provided with a perpendicular, hollow central column 18. This central column 18 has attached thereto a blow wheel 5 on a lower level and, on top of said blow wheel 5, a heating wheel 3 on an upper level, each of said wheels being rotatably supported on said central column. Hence, the heat of the heating wheel 3 can escape at the top unhindered. The heating wheel 3 and the blow wheel 5 have a common axis of rotation 7 and rotate in horizontal planes which are vertically displaced relative to each other. By means of a motor 19 and a transmission 20 comprising a plurality of gears, the heating wheel 3 and blow wheel 5 are driven in synchronism with each other, but at different speeds, in the direction of the arrow. The blow wheel 5 is fully covered by the heating wheel 3. The floor space of the frame 8 is therefore define

REFERENCES:
patent: 3453353 (1969-07-01), Ninneman
patent: 3599280 (1971-08-01), Rosenkranz
patent: 4046498 (1977-09-01), Appel et al.
patent: 4589837 (1986-05-01), Di Settembrini
patent: 4846663 (1989-07-01), Just-Hanig

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