US3817673A - Injection die-casting mechanism for sheathing a connection point - Google Patents

Injection die-casting mechanism for sheathing a connection point Download PDF

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Publication number
US3817673A
US3817673A US00315349A US31534972A US3817673A US 3817673 A US3817673 A US 3817673A US 00315349 A US00315349 A US 00315349A US 31534972 A US31534972 A US 31534972A US 3817673 A US3817673 A US 3817673A
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United States
Prior art keywords
injection
sheathing
half molds
injection cylinder
mold
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Expired - Lifetime
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US00315349A
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English (en)
Inventor
De Sandt I Van
De Sandt T Van
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SANDT I VAN DE
SANDT T VAN DE
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SANDT I VAN DE
SANDT T VAN DE
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Priority claimed from DE19712164446 external-priority patent/DE2164446C/de
Application filed by SANDT I VAN DE, SANDT T VAN DE filed Critical SANDT I VAN DE
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14467—Joining articles or parts of a single article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds

Definitions

  • ABSTRACT An injection die-casting mechanism for sheathing a connection point. e.g., between orientation thread and heddle in the case of Jacquard machines,-whereby the sheathing takes the form of an extended piece of plastic applied by means of an injection cylinder which can be raised and lowered and by means of a subjacent matrix consisting of two half molds as well as a kinematic connection between the injection cylinder and the matrix.
  • the invention refers to an injection diecasting mechanism for sheathing a connection point as between orientation thread and heddle in Jacquard machines. Its basic task is to attain a flawless bedding of the strands to be connected by means of the injection die-casting mechanism and simultaneously to achieve flawless guiding and closure of the two half molds as well as a lowering of the injection cylinder.
  • One half mold is movable in a horizontal plane and coupled with the injection cylinder and, in the area near the ends of the mold cavities, two rotatable sensors are set in the recesses of the opposite half mold thus bridging the gap between the separated half molds. This assures that a closure of the two half molds is possible only when the connection point is perfectly inserted in the mold cavity, whereby the guiding and closing of the two half molds is accomplished simultaneously as the perfect insertion is assured. At the same time,'the descending movement of the injection diecasting cylinder is started.
  • Swiss Pat. No. 339 373 describes a process for applyin g amounts of thermoplastic material at periodic intervals to extended objects, whereby this process is conceived as a continuous operation such that the extended object is guided through the mold and the two half molds move closer and separate rhythmically.
  • the flawless insertion of the extended object presents no problem and the machine can be controlled very simply by means of its automatic cadence.
  • two coordinated rubber buffers are located on each of the opposing surfaces of the half molds.
  • the mechanism be designed to be movable but with lockable wheels.
  • FIG. 1 shows a perspective view of a mechanism for producing the sheathing.
  • FIG. 2 is a diagrammatic view on a larger scale of a mold plate.
  • FIG. 3 is a top view on a smaller scale of the two coordinated mold plates.
  • FIG. 1 designates a stand which rests on the floor by means of a familiar cross-base which is equipped with rollers. One of these rollers can be either locked or raised by the illustrated lever 2, thus rendering the stand immovable.
  • a work surface 3 which has a rail 4 in which the connections to be treated can be inserted to facilitate the operation.
  • the work surface 3 supports an air cylinder 5, the piston of which supports a support mechanism 6 on which a familiar (and therefore not to be discussed) injection cylinder 7 is located.
  • the injection cylinder 7 can be raised and lowered dependently of the movement of the piston in air cylinder 5.
  • the actual mold 8 Located below the injection cylinder is the actual mold 8, the construction of which is explained in greater detail by FIGS. 2 and 3.
  • the injection cylinder 7 or the support mechanism 6 is connected with the movable half mold by means of a lever mechanism 9 in such a way that depending on the lowering movement of the piston along with the injection cylinder 7, the two half molds can be brought together, thus forming mold cavity 13.
  • .10 indicates the switching and control device which contains the appropriate switching elements and circuits to assure that the individual mechanisms are activated in accord with the work cycle. Since such devices are familiar in principle, further explanation of these here would be superfluous.
  • the actual mold 8 consists of the two half molds l1 and 12, of which half mold 12 is movable in the version shown and so connected with lever mechanism 9 that it can be brought together with the front surface of half mold 11.
  • a mold cavity 13 which has a long shape in accord with the desired connection point, whereby the manufacture of a long molded piece is made possible.
  • recesses 14 and 15 are provided which serve to accommodate the sections adjoining the connection point, e.g., the heddle and the orientation thread, and the size of which is in accord with the diameter of these parts.
  • Such a connection point is shown in FIG. 1, whereby l6 refers to the molded piece produced, 17 to the heddle and 18 to the orientation thread. In so doing, it is, of course, possible to connect the familiar eleastic cords (not shown in the drawing) to the heddle.
  • Mold cavity 13 also has on its upper side an injection channel 19 which opens into a connection funnel 20 which is developed and shaped corresponding to the injection head 21 of injection cylinder 7.
  • sensors 22 and 23 are located which are shown in their rest position according to FIG. 2 and thus cover recesses 14 and 15. By introducing the parts to be connected these sensors are pushed down, thus switching on the mechanism for initiating the operation.
  • the sensors 22 and 23 and the dependent switch are so constructed that the machine is switched on for operation only when both sensors are depressed simultaneously and to the same extent.
  • the sensors 22 and 23 protrude into corresponding recesses 24 and 25 of the opposite half mold, thus bridging the entire space between the two separated half molds 1 l and 12. This prevents with certainty any jamming or damage to the strands in the space between the two half molds.
  • Rubber buffers 26 are provided on the facing surface of both half molds l1 and 12. These come into contact with one another and consist of soft sponge rubber and between them secure the parts to be connected, so as to eliminate unintended contact switching by raising the strands and thus also the sensors.
  • recess 14 has a diameter of 0.9 mm, while the diameter of recess is 0.6 mm to accommodate the orientation thread.
  • the length of injection channel 19 is 1.5 mm and the diameter of the mold cavity 2 mm, while the length of the molded piece is 10.8 mm. From these dimensions the overall length of the mold can be inferred.
  • the mechanism operates in the following manner.
  • the parts to be connected e.g., a heddle l7 and an orientation thread 18 in the space between the two separated half molds 11 and 12
  • the sensors 22 and 23 are activated such that these are pressed downward and the heddle moves into recess 14 and the orientation thread 18 into recess 15.
  • the connection point e.g., a knot or other connection
  • an appropriate switching valve of air cylinder 5 is activated, whereby the injection cylinder 7 is moved downward and, simultaneously, the two half molds l l and 12 moved toward each other to form a seal on contact.
  • the injection cylinder 7 is switched on for operation.
  • pressure is applied to the actual injection cylinder 7 and plastic-state material inside injection cylinder 7 is injected through the injection channel 19 into mold cavity 13, thus forming the molded piece l6.
  • the duration of the injection By means of a time relay the duration of the injection, the temperature and other dependent factors are so regulated that after the time relay signal, i.e., after the injection operation has been completed, the switching of the air cylinder is reversed so that the piston is now moved upward, thus returning the injection cylinder 7 to its initial position and opening the half molds 11 and 12 to permit the removal of the finished molded piece 16 and the insertion of a new connection.
  • an injection die-casting machine for sheathing a workpiece such as a connection point between the orientation thread and the heddle in Jacquard machines, said sheathing being in the form of an extended plastic piece made from plastic extruded from an injection cylinder which can be raised and lowered, said sheathing being formed in a mold comprising two half molds located beneath the injection cylinder, and a kinematic connection between the injection cylinder and the mold, the improvement comprising one of said half molds being coupledwith said injection cylinder and movable thereby in a horizontal plane to provide a closable gap between said half molds, said molds having two oppositely disposed sets of recesses therein, and a pair of sensors bridging the gap and extending into said recesses, said sensors being movable by the insertion of a workpiece between said half molds to thereby signal said insertion.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
US00315349A 1971-12-24 1972-12-15 Injection die-casting mechanism for sheathing a connection point Expired - Lifetime US3817673A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712164446 DE2164446C (de) 1971-12-24 Spritzguß Vorrichtung zum Ummanteln einer Verbindungsstelle

Publications (1)

Publication Number Publication Date
US3817673A true US3817673A (en) 1974-06-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00315349A Expired - Lifetime US3817673A (en) 1971-12-24 1972-12-15 Injection die-casting mechanism for sheathing a connection point

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US (1) US3817673A (enExample)
FR (1) FR2164598B1 (enExample)
GB (1) GB1350739A (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230020705A1 (en) * 2019-03-28 2023-01-19 Olympus Corporation Method for molding thin-walled spiral tube for use with endoscope

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3004290A (en) * 1956-04-30 1961-10-17 Ohio Commw Eng Co Apparatus for molding plastic materials
US3242533A (en) * 1964-04-16 1966-03-29 Wintriss George Safety control for hydraulic mold machine with low pressure closing

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3004290A (en) * 1956-04-30 1961-10-17 Ohio Commw Eng Co Apparatus for molding plastic materials
US3242533A (en) * 1964-04-16 1966-03-29 Wintriss George Safety control for hydraulic mold machine with low pressure closing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230020705A1 (en) * 2019-03-28 2023-01-19 Olympus Corporation Method for molding thin-walled spiral tube for use with endoscope
US12458212B2 (en) * 2019-03-28 2025-11-04 Olympus Corporation Method for molding thin-walled spiral tube for use with endoscope

Also Published As

Publication number Publication date
DE2164446B1 (de) 1973-02-01
FR2164598A1 (enExample) 1973-08-03
GB1350739A (en) 1974-04-24
DE2164446A1 (enExample) 1973-02-01
FR2164598B1 (enExample) 1976-06-04

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