Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With accumulator – trap chamber – or serially arranged valves...
Utility Patent
1998-10-14
2001-01-02
Pyon, Harold (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With accumulator, trap chamber, or serially arranged valves...
C425S561000
Utility Patent
active
06168417
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a vertical molding machine vertically provided with a pre-plastication injection unit where an injection unit and a plastication unit are mounted side by side, and more particularly to a vertical molding machine where a plastication unit is held by an arm member of an injection unit through a spring member.
2. Background Art
A conventional pre-plastication injection unit comprises an injection unit with an injection screw or plunger in a heating cylinder and a plastication unit with a plastication screw in another heating cylinder provided side by side and horizontally. Such a conventional pre-plastication injection unit has a connecting pipe that links the tips of both of these units which serves as a resin passage for the injection and plastication units. That is to say, the above-mentioned type of pre-plastication injection unit transfers resin molten and mixed by the plastication unit (the process of melting and mixing resin is hereinafter referred to as “plastication”) from the plastication unit to the injection unit through the connecting pipe, meters the resin within the front portion of the heating cylinder of the injection unit and then injects the resin into a mold by the advance movement of the injection screw or plunger.
When the above-mentioned type of the pre-plastication injection unit is mounted horizontally on a machine base of a molding machine, the weight of the plastication unit never acts on the connecting pipe that links the tips of these units even if the plastication unit is placed above the injection unit.
On the other hand, if a clamping device is mounted vertically, the injection and plastication units need to be integrated into a single unit because they should be moved together simultaneously. At that time, the heating cylinders of these units expand differently due to different heating temperatures. Thus, there are problems such that the difference in expansion between both of the heating cylinders due to thermal expansion results in a great burden on both ends of the connecting pipe. Therefore, it is generally considered necessary to solve these problems when employing a pre-plastication injection unit for a vertical molding machine.
SUMMARY OF THE INVENTION
The present invention has been completed to solve the above-mentioned problems. Thus, it is an object of the present invention to provide a vertical molding machine that reduces the burden on the connecting pipe without significantly changing the configuration of a pre-plastication injection unit and a means for supporting the unit itself by employing a spring member to prevent damage to both ends of the connecting pipe.
It is a first aspect of the present invention to provide a vertical molding machine provided with a pre-plastication injection unit, comprising a pre-plastication injection unit comprising an injection unit with an arm member on the side thereof, a plastication unit held by the arm member and mounted next to the injection unit, and a connecting pipe linking the tip of the injection unit and the tip of the plastication unit, a clamping device, a pair of supports for supporting the injection unit mounted above the clamping unit, another pair of supports for supporting the plastication unit mounted above the clamping unit, and a spring member mounted on the arm member to hold the plastication unit, wherein the spring member reduces a burden on the above-mentioned connecting pipe which is caused by the dead weight of the plastication unit and the difference in thermal expansion between the heating cylinders of both units.
According to the above-mentioned configuration, the plastication unit is vertically held in a free state against the injection unit, and the spring member springy presses the plastication unit upward. Therefore, the spring force of the spring member offsetting the weight of the plastication unit eliminates a burden on the connecting pipe.
In addition, any difference in thermal expansion between the heating cylinders of both units is offset by the spring member. This eliminates a burden on the connecting pipe which is caused by a difference in thermal expansion and helps to reduce the possibility of damage of both ends of the connecting pipe, thus keeping the connecting pipe rigid even if the molding machine is operated for long periods. This also enables the characteristics of conventional horizontal pre-plastication injection units to be used effectively even if employed for vertical molding machines.
It is a second aspect of the present invention to provide a vertical molding machine provided with a pre-plastication injection unit according to the first aspect of the present invention, wherein the supports for the plastication unit are inserted through the arm member and the spring member to support the plastication unit.
According to the above-mentioned configuration, the spring force of the spring member acts in a correct direction since the supports are inserted through the arm member and the spring member to support the plastication unit.
It is a third aspect of the present invention to provide a vertical molding machine provided with a pre-plastication injection unit according to the first or second aspect of the present invention, wherein the spring force of the spring member is adjustable by a spring-force adjusting member for adjusting the spring force of the spring member.
According to the above configuration, the spring force of the spring member is made adjustable and it is possible to accurately correct the dislocation of the plastication unit due to a change in weight or thermal expansion.
REFERENCES:
patent: 3807924 (1974-04-01), Mingotti
patent: 3852010 (1974-12-01), Hehl
patent: 4278354 (1981-07-01), Hehl
patent: 4589839 (1986-05-01), Kurumaji et al.
patent: 5744172 (1998-04-01), Todaka et al.
patent: 5863567 (1999-01-01), Klaus
patent: 5914139 (1999-06-01), Matsubayashi et al.
Luk Emmanuel
Nissei Plastics Industrial Co. Ltd.
Ostrolenk Faber Gerb & Soffen, LLP
Pyon Harold
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