Plastic article or earthenware shaping or treating: apparatus – Sets of male-female press molds – Traveling female mold
Patent
1996-11-20
1998-09-15
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Sets of male-female press molds
Traveling female mold
425348R, 425411, 425415, B29C 4358
Patent
active
058075925
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an apparatus for pressure-molding items made of plastics, such as caps for closing containers, glasses, and the like.
BACKGROUND ART
Conventional devices for pressure-molding caps for closing containers, such as screw caps, comprise: a rotating pressure-molding carousel composed of a supporting element that rotates about a vertical central axis; a plurality of pressure-molding units that are mounted on said rotating supporting element concentrically to said central axis and at the same angular distance from each other, each one of said units comprising an upper punch and a lower mold that has a molding cavity, said punches and molds cooperating with each other and being movable with respect to each other along vertical axes; means for actuating said supporting element so that said molding units advance along a circular path that includes a region for loading the plastics to be molded, a molding region, a cooling region, and a region for unloading the molded item; and means for moving the punches with respect to the molds along the corresponding axes according to a preset criterion during the rotation of said supporting element. Such a conventional device is known from the prior document EP-A-474 125.
Drawbacks during the loading of the plastics in the molding units are observed in these known devices, since it is necessary to strike a compromise between the quick removal of the doses and the deposition of the doses in the molding cavities.
SUMMARY OF THE INVENTION
The technical aim of the present invention is to provide an apparatus for obviating these drawbacks.
Within the scope of this aim, an object of the present invention is to provide an apparatus in which the loading means are structured so that they can be moved away from the molding units so as not to interfere with them in case of jammings in said units.
Another object is to provide an apparatus that allows to remove the items that arrive from the molding carousel after cooling.
This aim and these objects are achieved with an apparatus whose characteristics are defined in the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
Further characteristics of the present invention will become apparent from the following description on the basis of the accompanying drawings, wherein:
FIG. 1 is a vertical sectional view of a part of an apparatus for pressure-molding caps for closing containers;
FIG. 2 is a vertical sectional view of a portion of FIG. 1;
FIG. 3 is a plan view of the portion shown in FIG. 2;
FIG. 4 is a vertical sectional view of a variation of the removal elements;
FIG. 5 is a sectional view of a second embodiment of the apparatus;
FIG. 6 is a schematic view of the operation of the embodiment of FIG. 5;
FIG. 7 is a sectional view of a third embodiment.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
With reference to FIGS. 1 to 3, the apparatus comprises a carousel that is generally designated by the reference numeral 1 and rotates about a vertical axis A. The carousel comprises a supporting element 2 on which a plurality of molding units are mounted; each molding unit comprises an upper punch 3, which is fixed with respect to the element 2, and a lower mold 4, which is movable along an axis B for alignment with the punch 3.
The molding units are distributed at an equal angular distance with respect to the axis A, so that their axes B move along a circular path C (see FIG. 3) that is concentric with respect to the axis A.
Each mold 4 has a cavity 5 for molding a dose of material fed by a head 6 that rotates about an axis D that lies outside the path C and is parallel to the axis B.
The mold 4 is mounted at the upper end of a vertical stem 7 that is hermetically guided in two bushes 8 and 9 arranged in a cylindrical seat 10 of the supporting element 2.
The stem 7 is externally provided with a piston 11 that is slideable hermetically within the seat 10 and divides said seat into two superimposed chambers that can be connected to the delivery and to the discharge of a pressurized fluid by means of
REFERENCES:
patent: 3775032 (1973-11-01), Smith et al.
patent: 5071339 (1991-12-01), Murayama et al.
patent: 5580586 (1996-12-01), Yokoyama
Soviet Engineering Design, vol. 6, No. 7, Jul. 1985 Melton Mowbray, Leicestershire, Gr. Britain, pp. 37-39, Sokolov et al. "Strucural Analysis of Rotary Mechanics for Pressing of Plastic Materials"--see figure 2. see figure 2.
Heitbrink Tim
Josif Albert
Modiano Guido
SACMI Cooperative Meccanici Imola S.c.r.l.
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