EP0097992B1 - Verfahren und Vorrichtung zum Konturschneiden von Kunststoffprodukten - Google Patents

Verfahren und Vorrichtung zum Konturschneiden von Kunststoffprodukten Download PDF

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Publication number
EP0097992B1
EP0097992B1 EP83200884A EP83200884A EP0097992B1 EP 0097992 B1 EP0097992 B1 EP 0097992B1 EP 83200884 A EP83200884 A EP 83200884A EP 83200884 A EP83200884 A EP 83200884A EP 0097992 B1 EP0097992 B1 EP 0097992B1
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EP
European Patent Office
Prior art keywords
filaments
movement
starting material
framework
block
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83200884A
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English (en)
French (fr)
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EP0097992A1 (de
Inventor
Hendricus Johannes Maria Van Dijk
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Gebr Van Dijk Bv
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Gebr Van Dijk Bv
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Application filed by Gebr Van Dijk Bv filed Critical Gebr Van Dijk Bv
Priority to AT83200884T priority Critical patent/ATE24682T1/de
Publication of EP0097992A1 publication Critical patent/EP0097992A1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F3/00—Severing by means other than cutting; Apparatus therefor
    • B26F3/06—Severing by using heat
    • B26F3/08—Severing by using heat with heated members
    • B26F3/12—Severing by using heat with heated members with heated wires
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/547—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a wire-like cutting member
    • B26D1/553—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a wire-like cutting member with a plurality of wire-like cutting members

Definitions

  • the invention relates to a method for simultaneously contour cutting a plurality of identical uniform plastic products from a single block of starting material, using a plurality of filaments disposed in parallel array for engagement of said single block and heated by an electric current, the filaments being given an oscillating movement along their longitudinal axis, the starting material being given a movement in the horizontal direction and at least some of the filaments being given a synchronised alternating movement in the vertical direction.
  • the invention also relates to an apparatus for simultaneously contour cutting a plurality of identical uniform plastic products from a single block of starting material, according to the above method, comprising a work table movable substantially in a horizontal direction for receiving at least a part of a block of starting material, a drive mechanism for horizontal movement of the work table, a number of substantially vertical columns, a framework supporting a plurality of electrically heated filaments in parallel array as cutters for said block of starting material, a drive for imparting an oscillating movement to the filaments along their longitudinal axis, and drive means for imparting alternating vertical movement synchronised with the horizontal movement to at least some of the filaments.
  • Such a method and apparatus are known from US ⁇ A ⁇ 3 786 701 in which a method and apparatus are disclosed for simultaneously contour cutting a plurality of identical uniform plastic products from a single block of starting material, using a plurality of filaments disposed in parallel array and heated by an electric current, the filaments being given an oscillating movement along their longitudinal axis and the starting material being given a movement in the horizontal direction, and at least some of the filaments being given a synchronised alternating movement in the vertical direction.
  • This known method and apparatus are only intended for cutting during motion of the supporting platform in one single direction, and the framework in which two sets of parallel cutting filaments are mounted is given an oscillating movement as a whole.
  • One set of parallel cutting filaments is directly connected to the frame by means of longitudinally aligned springs, while a second set of parallel cutting filaments is connected to movable bars by means of springs in which the movable bars move vertically in the plane of mounting of the filaments and are directly controlled by guide wheels, following patterns which are fixedly connected to the apparatus.
  • the array of filaments is maintained in a common horizontal plane during cutting whereby said array has imparted to it an alternating programmed movement in the vertical direction, and a correspondingly programmed alternating movement is imparted to the block of starting material in the horizontal direction, thus defining in combination a prescribed cutting contour of each filament relative to the block of starting material.
  • an apparatus of the type indicated above is characterized in that the framework is U-shaped and is disposed substantially in a horizontal plane such that the array of filaments is supported in a common horizontal plane, the drive for longitudinal oscillation of the filaments being adapted to oscillate the filaments within said U-shaped frame, in that the driving means for alternating vertical movement of the array of filaments are adapted to move the U-shaped framework up and down along the vertical columns according to a program thus transporting the plane of the filament array vertically, and in that the drive mechanism for horizontal movement of the work table is provided with a program for the horizontal alternating displacement of the work table, such that in combination with the programmed movement of the framework, the filaments follow a prescribed cutting contour relative to the block of starting material.
  • a method for contour cutting a plurality of uniform plastic products from a block of starting material using a plurality of filaments disposed in parallel array and heated by an electric current, in which the block of starting material is given a programmed alternating movement, that is substantially parallel to the plane of the filaments.
  • the filaments are only given a vertical movement, which is not alternating when the method is carried out, and the corresponding programmed movement in the horizontal direction of the block of starting material is obtained by means of a cammed wheel, by which it is only possible to obtain a quite simple form of contour.
  • EP-A-0 035 852 an apparatus for contour cutting is described using four vertical columns disposed around the work table to support and guide a U-shaped framework, each column being provided with drive means for the vertical displacement of that part of the framework supported by the column.
  • this known apparatus use is made of an endless cutting wire rotating on discs, and the framework, in which the cutting wire has been mounted, is given a movement in one direction, and the product to be cut a movement at right angles to the first movement. It is possible, by using this apparatus, to cut at most two blocks of material into a shape having a desired contour.
  • this apparatus for cutting two identical products at the same time is already quite complicated, and it cannot be seen how an increased number of products could easily be cut at the same time.
  • the apparatus depicted in Figure 1 comprises a base frame 1 on which four vertical columns 2 have been mounted in a rectangle. Enclosed within the columns is a work table 3. In the long direction of the apparatus a supporting beam 4 has been provided at both ends. These supporting beams are suspended on vertical carrier heads 5 which can be moved along the columns 2. Each of the carrier heads 5 is connected through a chain 6 and a sheave 7 with a counterweight 8. The load of this counterweight 8 is chosen such that it virtually compensates the load of the framework with supporting beams and any other components fitted to it weighing on each carrier head 5. Each of the carrier heads 5 can be displaced in a vertical direction by driving means - not shown in the drawings - moving synchronously for each carrier head, such as a screw spindle with nut. All these driving means are linked together for the four columns by means of drive shafts 9 and 10 in the longitudinal and crosswise direction, respectively.
  • a drive motor is denoted by 11. Obviously, more drive motors may be applied, provided a vertically uniform displacement of the carrier heads is ensured.
  • the columns are connected together at the top by means of structural shapes 12 and 13, respectively.
  • Each of the supporting beams 4 is provided at the location of a vertical column 2 facing the carrier head with a coupling flange 14 for the attachment of the U-shaped framework to be discussed below.
  • a screw spindle 15 with driving motor 16 has been mounted underneath the work table 3. This screw spindle meshes with a nut incorporated into a support 17 underneath the work table 3.
  • the motor 16 enables the work table 3 to be moved to and fro over a distance of about two metres.
  • the left-hand portion of the work table in Figure 1 is provided with a number of rollers 20 which allow of telescopic movement relative to a stationary supply conveyor 21.
  • the work table 3 terminates above a delivery conveyor 22.
  • a combined drive through the motors 11 and 16 any desired movement can be realized of the work table 3 in a horizontal direction and of the supporting beams 4 with the parts mounted in between to be described hereinafter in a vertical direction.
  • these drives may be operated under numerical control.
  • Figure 3 is top view of a substantially U-shaped frame consisting of two longitudinal bars 30 connected by a cross bar 31.
  • Each bar 30 is provided with two coupling flanges 32 to permit mounting between the supporting beams 4 by means of the coupling flanges 14 mounted thereon.
  • the longitudinal bars 30 are of the box type and each provided with a fan with motor 33 for the supply of cooling air to each bar 30.
  • a rocker arm 35 At the side of each bar 30 a rocker arm 35 has been fitted. The rocker arms 35 move synchronously in opposite directions.
  • a support 36 is provided for tension bars 37.
  • a filament 40, a tension spring 41 and two terminal pull cables 42, 43 are invariably mounted between the two tension bars (see figure 6).
  • the hollow bar is provided with discharge openings 45. Cold air supplied flows through these openings and thereby cools the part of the filaments 40 that projects from a block 46 to be cut.
  • a lever 50 On the end of the rocker arms 35 that is located near the cross bar 31 a lever 50 has been mounted. The tip of this lever rests at 51 on an eccentric 52 which forms part of a short axle provided with a gear wheel 53.
  • the two gear wheels 53 are interconnected by a rubber driving belt 54 which is provided with an internal toothing and which is held under initial tension by means of a movable thrust collar 55.
  • the eccentric shaft mounted on the right-end side in Figure 4 is driven by a motor 56 (see also Figure 3).
  • a synchronous displacement of the two rocker arms is accomplished by the use of a toothed belt.
  • the initial tension of the several springs 41 ensures that the levers 50 continuously lie against the eccentric 52.
  • the work table is designed for receiving a block of starting material at least four metres long. It is also possible to process blocks of starting material twelve metres long by running such blocks through the apparatus in three passes.
  • the block of starting material can be pushed on to position 60, it being understood that its front will have been profiled in accordance with the contours of the cut products, and subsequently a corresponding number of products can be cut by a substantially upward movement of the U-shaped frame, to be followed by a third series of products made from the block of starting material.
  • oscillating contour cutting can be practised not only on thermoplastic synthetics such as polystyrene foam, but also on rigid foam material such as polyurethane.
  • the surface so obtained is smooth and comparable to that produced by mechanical sawing, but without any sawdust being formed.
  • Cutting according to the invention involves a material loss of at most 1 mm, whilst the cutting speed attainable for, say, rigid polystyrene foam may be as much as four metres per minute.
  • the temperature of the filament is set to a value of 80 to 90°C, but, depending on the resistance of the material to be cut, a higher equilibrium temperature may be reached on account of the friction.
  • An effective straight cut proves to be feasible at an average initial tension of the filaments of 10 kg.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Details Of Cutting Devices (AREA)

Claims (6)

1. Verfahren für das gleichzeitige Konturschneiden einer Vielzahl von identischen, einheitlichen Kunststoffprodukten aus einem einzigen Block eines Ausgangsmaterials, wobei eine Vielzahl von Fäden (40) verwendet wird, die in einem parallelen Aufbau angeordnet sind, um in den einzigen Block einzugreifen, und mit elektrischem Strom geheizt werden, wobei die Fäden (40) entland ihrer Länsachse eine Schwingbewegung erfahren, wobei das Ausgangsmaterial eine Bewegung in horizontaler Richtung erfährt, und wobei zumindest einige der Fäden eine synchronisierte Wechselbewegung in vertikaler Richtung erfahren, dadurch gekennzeichnet, daß der Aufbau von Fäden während des Schneidevorgangs in einer gemeinsamen Horizontalebene gehalten wird, wobei dem Aufbau eine programmierte Wechselbewegung in vertikaler Richtung aufgeprägt wird, und wobei eine entsprechend programmierte Wechselbewegung dem Block des Ausgangsmaterials in horizontaler Richtung aufgeprägt wird, wodurch zusammen eine vorgeschreibene Schnittform eines jeden Fadens relativ zum Block des Ausgangsmaterials festgelegt wird.
2. Vorrichtung für das gleichzeitige Konturschneiden einer Vielzahl von identischen, einheitlichen Kunststoffprodukten aus einem einzigen Block eines Ausgangsmaterials gemäß dem Verfahren von Anspruch 1, wobei sie einen Maschinentisch (3), der im wesentlichen in einer horizontalen Richtung bewegbar ist, um zumindest einen Teil eines Blocks des Ausgangsmaterials aufzunehmen, einen Antrieb (15,16,17) für die Horizontalbewegung des Maschinentischs, eine Anzahl von im wesentlichen vertikalen Säulen (2), einen Rahmen (30, 31), um eine Vielzahl von elektrisch geheizten Fäden (40) in einem parallelen Aufbau als Schneidevorrichtungen für den Block des Ausgangsmaterials zu halten, einen Antrieb (56, 54, 52, 53, 51, 50, 35, 36, 37), um den Fäden entlang ihrer Längsachse eine Schwingbewegung aufzuprägen, sowie einen Antrieb (11, 9, 10) enthält, um zumindest einigen der Fäden (40) eine vertikale Wechselbewegung aufzuprägen, die mit der Horizontalbewegung synchroniserit ist, dadurch gekennzeichnet, daß der Rahmen (30, 31) U-förmig ausgebildet und im wesentlichen in einer horizontalen Ebene angeordnet ist, so daß der Aufbau der Fäden (40) in einer gemeinsamen Horizontalebene gehalten wird, wobei der Antrieb für die Längschwingung der Fäden so aufgebaut ist, daß die Fäden innerhalb des U-förmigen Rahmens in Schwingung versetzt werden, und wobei der Antrieb (11, 9, 10) für die vertikale Wechselbewegung des Aufbaus von Fäden so aufgebaut ist, daß er den U-förmigen Rahmen längs der vertikalen Säulen (2) gemäß einem Programm auf und ab bewegt, wodurch die Ebene des Fadenaufbaus senkrecht verschoben wird, und wobei der Antrieb (16, 15, 17) für die Horizontalbewegung des Maschinentischs mit einem Programm für die horizontale Wechselverschiebung des Maschinentischs (3) versehen ist, so daß die Fäden zusammen mit der programmierten Bewegung des Rahmens einer vorgeschriebenen Schnittform relativ zum Block des Ausgangsmaterials folgen.
3. Vorrichtung gemäß Anspruch 2, dadurch gekennzeichnet, daß sie mit vier vertikalen Säulen (2) versehen ist, die rund um den Maschinentisch (3) in einem Rechteck angeordnet sind, um den U-förmigen Rahmen (30, 31) zu halten und zu führen, wobei jede Säule mit einem Antrieb (11) für die Vertikalbewegung jenes Rahmenteils versehen ist, den diese Säule trägt, während die Antriebe von allen vier Säulen miteinander verbunden sind, um eine synchrone Bewegung hervorzurufen, wobei jede Säule weiters ein Gegengewicht (8) enthält, das angeordnet ist, um im wesentlichen den Gewichtsanteil des U-förmigen Rahmens mit den darauf befestigten Bauteilen auszugleichen, der von der entsprechenden Säule getragen wird.
4. Vorrichtung gemäß jedem der Ansprüche 2 und 3, dadurch gekennzeichnet, daß jeder Faden (40) mit einer Spannfeder (41) verbunden ist, so daß der Faden und die Spannfeder fortlaufend zwischen zwei Zugstäben (37) gespannt werden, die parallel zueinanderinnerhalb des U-förmigen Rahmens befestigt sind, wobei die Zugstäbe synchron in entgegengesetzte Richtungen zu- und voneinander bewegt werden können; wodurch den Fäden eine hin- und hergehende Bewegung aufgeprägt wird; während die Spannfedern, die an den entsprechenden Fäden sitzen, vorzugsweise abwechselnd am einen und am anderen Zugstab befestigt sind.
5. Vorrichtung gemäß Anspruch 4, dadurch gekennzeichnet, daß jeder Zugstab (37) auf einem Schwinghebel (35) befestigt ist, von denen jeder auf einer der beiden parallelen Seitenstangen (30) des U-förmigen Rahmens (30, 31) drehbar gelagert und in der Nähe der Querstange (31) des U-förmigen Rahmens mit einer Spannvorrichtung (51, 52, 53) und einem Hebel (50) versehen ist, wobei dieser Hebel durch die Spannung der Fäden (40), der Spannfedern (41) und der Spannvorrichtung (51, 52, 53) dazu veranlaßt wird, auf einem Exzenter (52), der einen Teil der jeweiligen Spannvorrichtung (51, 52, 53) darstellt, zu ruhen, wobei der Exzenter zu beiden Seiten des U-förmigen Rahmens auf einer Welle angebracht ist, die mit Hilfe eines gemeinsamen Antriebsmotors (56) und eines Zahnriemens (54) angetrieben wird, so daß die entsprechende Zugstange (37) auf ihrem Schwinghebel (35) entgegengesetzt zur Zugstange (37) bewegt wird, die der anderen Seite des U-förmigen Rahmens gegenüber liegt.
6. Vorrichtung gemäß jedem der Ansprüche 2 bis 5, dadurch gekennzeichnet, daß der Maschinentisch (3) mit einer Vielzahl von Rillen (70) versehen ist, die in Querrichtung ausgebildet sind, um die Fäden (40) in der untersten Stellung des U-förmigen Rahmens aufzunehmen.
EP83200884A 1982-06-16 1983-06-16 Verfahren und Vorrichtung zum Konturschneiden von Kunststoffprodukten Expired EP0097992B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83200884T ATE24682T1 (de) 1982-06-16 1983-06-16 Verfahren und vorrichtung zum konturschneiden von kunststoffprodukten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8202437 1982-06-16
NL8202437A NL8202437A (nl) 1982-06-16 1982-06-16 Werkwijze en inrichting voor het contoursnijden van kunststof produkten, en verbeterde contourgesneden produkten.

Publications (2)

Publication Number Publication Date
EP0097992A1 EP0097992A1 (de) 1984-01-11
EP0097992B1 true EP0097992B1 (de) 1987-01-07

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EP83200884A Expired EP0097992B1 (de) 1982-06-16 1983-06-16 Verfahren und Vorrichtung zum Konturschneiden von Kunststoffprodukten

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EP (1) EP0097992B1 (de)
AT (1) ATE24682T1 (de)
DE (1) DE3368888D1 (de)
NL (1) NL8202437A (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8500525A (nl) * 1985-02-25 1986-09-16 Dijk Bv Gebr Van Werkwijze en inrichting voor het contoursnijden.
FR2665100A1 (fr) * 1990-07-27 1992-01-31 Croma Sarl Procede et appareil pour couper des blocs et des plaques de materiaux synthetiques cellulaires.
US5826873A (en) * 1994-06-16 1998-10-27 Interlock Marketing Pty. Ltd. Three dimensional puzzles
US5950512A (en) * 1996-10-11 1999-09-14 Gary D. Fields Apparatus to make building blocks for blockwork domed structures, and method and domed structure
DE29801499U1 (de) * 1998-01-30 1999-06-02 Kurtz Altaussee Gmbh, Altaussee Schneidvorrichtung zum Schneiden von thermisch bearbeitbarem Material
FR2787376B1 (fr) * 1998-12-22 2001-03-09 Esox Procede et installation de decoupe de pieces de forme quelconque
ITVR20120072A1 (it) * 2012-04-13 2013-10-14 Oms Automation S R L Dispositivo di taglio di elementi lastriformi per la produzione di pannelli in materiale plastico espanso
CN115194892B (zh) * 2022-07-28 2023-11-28 无锡焙斯机械有限公司 一种黄油切割机

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3786701A (en) * 1971-11-05 1974-01-22 E Ludwig Device for cutting urethane foam

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3089526A (en) * 1960-06-23 1963-05-14 Lykkeberg Alfred Machine for slicing meat
FR1355283A (fr) * 1963-04-29 1964-03-13 Simoniz Co Machine à découper
BE754761A (en) * 1970-08-12 1971-01-18 Vossen Claude Slicing meat
AU7815375A (en) * 1974-02-27 1976-08-12 Treffner P Method and apparatus for cutting plastics materials
AU4306579A (en) * 1978-01-09 1979-07-19 Charles Treffner Multi-bladed cutting apparatus
US4175455A (en) * 1978-03-22 1979-11-27 Mcneil Corporation Travelling cut-off saw
EP0035852A3 (de) * 1980-02-27 1981-09-23 J. MacA. King & Co., Limited Formschneidevorrichtungen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3786701A (en) * 1971-11-05 1974-01-22 E Ludwig Device for cutting urethane foam

Also Published As

Publication number Publication date
NL8202437A (nl) 1984-01-16
DE3368888D1 (en) 1987-02-12
ATE24682T1 (de) 1987-01-15
EP0097992A1 (de) 1984-01-11

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