Blow molding machine

Details Blow molding machine Blow molding machine

1998-10-21

2002-12-31

Silbaugh, Jan H. (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

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

Including means to prepare parison

C425S541000, C425S451000

Reexamination Certificate

active

06499988

ABSTRACT:

TECHNICAL FIELD
This invention relates to a blow molding machine usable when a hollow-molded product is manufactured by a blow molding process, and more particularly to a dual reciprocating type blow molding machine having two mold-clamping devices.
BACKGROUND ART
A blow molding machine
100
shown in
FIG. 13
is known as a dual reciprocating type blow molding machine having two mold-clamping devices. This blow molding machine
100
includes an extruding device
120
, one pair of mold-clamping devices
130
,
130
′, and hammering devices
140
,
140
′ for hammering blow pins
141
,
141
′ respectively into molds
131
,
131
′ in the one pair of mold-clamping devices
130
,
130
′. For blowing, a parison P extruded from a cross head
121
of the extruding device
120
is clamped by alternately switching the mold-clamping devices
130
,
130
′ and then, the blow pins
141
,
141
′ are hammered into the molds
131
,
131
′ by the hammering devices
140
,
140
′, respectively.
By the way, in the above-mentioned conventional blow molding machine
100
, since the one pair of mold-clamping devices
130
,
130
′ are linearly arranged in a perpendicular direction (z-direction of
FIG. 13
) to an opening- and closing-direction (direction piercing into the paper surface of
FIG. 13
) of the molds in the mold-clamping devices
130
,
130
′, it is necessary to provide two devices at both sides thereof for taking out a molded product after molding. It is also necessary to provide two systems of equipment for transferring molded products after they are taken out. Moreover, it is necessary that the mold-clamping devices
131
,
131
′ are in standby positions with an interval equal to or more than the width of a platen so that they are not interfered with each other when they stop under the cross head
121
. This arrangement makes it necessary to increase a moving quantity of the mold-clamping devices. Accordingly, there is such a problem that an area for installing the machine is inevitably increased. Furthermore, since the hammering devices
141
,
141
′ are provided to perform a hammering operation from above the standby positions of the mold-clamping devices
130
,
130
′, inconveniences arise in view of layout when an increased number of extruding devices
2
are required in accordance with change in composition of the parison P or when an in-mold labeler is installed to perform an in-mold labeling.
DISCLOSURE OF INVENTION
It is, therefore, the first object of the present invention to provide a blow molding machine in which a device for taking out a molded product can be single in system and an area required for installing a machine can be reduced extensively. It is the second object of the present invention to provide a blow molding machine in which extruding devices can be increased in number and in-mold labelers can be arranged without any inconveniences in view of layout.
According to a feature of the present invention, there is provided, in order to achieve the first object, a blow molding machine comprising an extruding device, one pair of mold-clamping devices, and hammering devices for hammering blow pins respectively into molds in the one pair of mold-clamping devices, for blowing, a parison extruded from the extruding device being clamped by alternately switching the mold-clamping devices and then, the blow pins being hammered into the molds by the hammering devices, respectively, wherein the one pair of mold-clamping devices are linearly arranged in the same direction as an opening- and- closing direction of the molds in the mold-clamping devices.
According to a further feature of the present invention, there is provided, in order to achieve the first and second objects, a blow molding machine, wherein the hammering devices are each supported by tie bars or platens in each of the one pair of mold-clamping devices, and the blow pins are hammered respectively into the molds from under the molds by the hammering devices.
In the blow molding machine of the present invention, the parison extruded from the extruding device is clamped by alternately switching the one pair of mold-clamping devices and the blow pins are hammered respectively into the molds by the hammering devices for blowing. Since the one pair of mold-clamping devices are linearly arranged in the same direction as the opening-and-closing direction of the molds in the mold-clamping devices, the taking-out device can be provided only on one side of the mold-clamping devices. Accordingly, a molded product can be taken out by a single system and an area required for installing the machine can be reduced extensively.
In the blow molding machine of the present invention, since the hammering devices are each supported by the tie bars or the platens in each of the mold-clamping devices and the blow pins are hammered from under the molds, no inconvenience arises in view of layout when additional number of the extruding devices are employed in accordance with change in composition of the parison or when an in-mold labeler is installed to perform an in-mold labeling.


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