EP0466715A1 - Device for automatically setting up the multiple tool in hot-wire cutting machines. - Google Patents

Device for automatically setting up the multiple tool in hot-wire cutting machines.

Info

Publication number
EP0466715A1
EP0466715A1 EP90904622A EP90904622A EP0466715A1 EP 0466715 A1 EP0466715 A1 EP 0466715A1 EP 90904622 A EP90904622 A EP 90904622A EP 90904622 A EP90904622 A EP 90904622A EP 0466715 A1 EP0466715 A1 EP 0466715A1
Authority
EP
European Patent Office
Prior art keywords
wires
slide
carriage
control unit
along
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.)
Granted
Application number
EP90904622A
Other languages
German (de)
French (fr)
Other versions
EP0466715B1 (en
Inventor
Carlo Donadon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hirsch Maschinenbau GmbH and Co KG
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=11324338&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0466715(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Publication of EP0466715A1 publication Critical patent/EP0466715A1/en
Application granted granted Critical
Publication of EP0466715B1 publication Critical patent/EP0466715B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
    • B26D7/2628—Means for adjusting the position of the cutting member
    • 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
    • B26D1/46—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 an endless band-knife or the like
    • B26D1/50—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 an endless band-knife or the like with a plurality of band-knives or the like
    • B26D1/52—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 an endless band-knife or the like with a plurality of band-knives or the like having adjustable spacing between knives
    • 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

  • This invention relates to a device for automatically setting up the multiple tool in hot-wire cutting machines, particularly for sheets and blocks of polystyrene and the like.
  • Hot-wire cutting machines for sheets and blocks of polystyrene and similar materials are known- They generally comprise a bench on which the blocks or sheets to be cut are rested, and a pair of side walls between which a plurality of metal wires are stretched transversely to said bench. When in operation, these wires are traversed by an electric current which heats them to a temperature sufficient to cause localized melting of the polystyrene. The polystyrene is cut into pieces of the required shape by the longitudinal and vertical movement of all the wires relative to the polystyrene.
  • the movement of the metal wires relative to the bench and thus relative to the polystyrene can be obtained either by a double horizontal and vertical movement of the wire-support ing side walls relative to the fixed bench or by a double horizontal and vertical movement of said bench relative to fixed side walls, or again by a horizontal movement of the side walls and a vertical movement of the bench.
  • the number and arrangement of the wires between the two side walls and thus the configuration of the multiple tool to be used at any given time obviously varies according to the number of polystyrene pieces to be produced, their shape and their size.
  • the preparation of the particular tool ie the setting up of the machine, comprises arranging the wires between the two side walls in the number and arrangement corresponding to the particular work to be carried out. This preparation is urrently done manually, and this results in a series of drawbacks which the present invention proposes to el iminate.
  • a device for automatically setting up the multiple tool in hot-wire cutting machines comprising a bench on which the material to be cut is rested, a pair of side walls between which a plurality of electrically heated wires are stretched, and means for longitudinally and vertically moving said side walls relative to said bench in such a manner that said wires hot-cut the material resting on said bench into the predetermined pattern, characterised in that each side wall comprises a longitudinal bar along which there are slidable a plurality of slides to which the ends of the wires are fixed and a carriage provided with a member for the removable engagement of each slide and driven under the control of an electronic control unit in order to position said slide along the respective longitudinal bar in accordance with data acquired by said control unit.
  • Figure 1 is a schematic plan view of a hot-wire cutting machine provided with the device according to the invention.
  • Figure 2 is a partial longitudinal section therethrough on the line II-II of Figure 1;
  • Figure 3 is an enlarged partial cross-section therethrough on the line III-III of Figure 1 in the non-operative condition
  • Figure 4 is the same view as Figure 3 but in the operative condition.
  • the machine according to the invention comprises a bench or base 1 of substantially traditional type, to the side of which there are disposed two side walls 2 each comprising a longitudinal bar 3.
  • the purpose of the bench 1 is to support the polystyrene sheets or blocks to be cut, whereas the purpose of the longitudinal bars 3 is to support a plurality of transverse wires 4 which hot-cut the polystyrene.
  • the side walls 2 are mobile both axially and vertically relative to the bench 1 so as to cause the wires 4 to move relative to the polystyrene.
  • This relative movement which is obtained either by moving the bench 1 or by moving the side walls 2 or by moving both, is effected with traditional systems which do not form part of the invention and are not shown on the drawings for reasons of clarity.
  • Each longitudinal bar 3 which is constructed preferably of aluminium or another metal, is hinged to the corresponding side wall 2 by a horizontal hinge 5, the purpose of which will be apparent hereinafter, and is also provided with a longitudinal round rod 6 of conducting material such as brass, connected to theelectrical power supply.
  • Each longitudinal bar 3 has a rail profile along which a carriage indicated overall by
  • the carriage 7 is provided with a stepper motor or a direct current motor controlled by an electronic control unit, not shown on the drawings. It is also provided with a pin 9 operated by a pneumatic actuator 10 which moves it axially between an advanced position in which it engages a corresponding cavity 11 of each slide 8, and a retracted position of disengagement.
  • each slide 8 comprises a further cavity 12 housing a coil spring 13 for tensioning the corresponding wire 4.
  • the motors are stopped and the pins 9 are disengaged from the corresponding cavity 11, so that the last wire 4a is left in its definitive position along the bars 3.
  • the motors are then advanced through a distance equal to the thickness of the slides 8 and the pins 9 of the two carriages are again advanced to engage the corresponding cavity 11 of the adjacent slide 8b.
  • a subsequent command fed simultaneously to the two bars 3 causes them to rotate about the respective hinges 5 in the direction of the arrow 16 in Figure 3, so raising the round rods 6 and bringing them into contact with the wires 4 in the traditional manner.
  • the multiple tool is now ready to operate.
  • the carriages 7, which still have their pin 9 engaged in the corresponding slide of the first wire 4 are caused to move towards the end 14 of the bars, to thus pack the various pairs of slides 8 at that end, after which the previous procedure can be carried out based on data for the new arrangement to be obtained.

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)
  • Wire Processing (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

Un dispositif de réglage automatique de l'outil multiple dans des machines de coupe à fil chaud, destiné notamment à des feuilles et à des blocs de polystyrène et analogue, comprend un banc sur lequel repose la matière à couper, une paire de parois latérales entre lesquelles une pluralité de fils chauffés électriquement sont étirés, ainsi qu'un moyen permettant de déplacer longitudinalement et verticalement lesdites parois latérales, par rapport audit banc, de sorte que lesdits fils coupent à chaud la matière reposant sur ledit banc, selon la configuration prédéterminée. Ledit dispositif est caractérisé en ce que chaque paroi latérale (2) comprend une barre longitudinale (3), le long de laquelle glissent une pluralité de coulisses (8) auxquelles les extrémités des fils (4) sont fixées, ainsi qu'un chariot (7) doté d'un élément (9) assurant le contact séparable de chaque coulisse (8), et entraîné sous la commande d'une unité de commande électronique, afin de positionner ladite coulisse le long de la barre longitudinale respective (3), selon les données acquises par ladite unité de commande.An automatic multiple tool setting device in hot wire cutting machines, particularly for polystyrene sheets and blocks and the like, comprises a bed on which the material to be cut rests, a pair of side walls between which a plurality of electrically heated wires are drawn, and means for longitudinally and vertically moving said side walls, relative to said bed, so that said wires heat cut the material resting on said bed, according to the predetermined configuration. Said device is characterized in that each side wall (2) comprises a longitudinal bar (3), along which slide a plurality of slides (8) to which the ends of the wires (4) are fixed, as well as a carriage ( 7) provided with an element (9) ensuring the separable contact of each slide (8), and driven under the control of an electronic control unit, in order to position said slide along the respective longitudinal bar (3), according to the data acquired by said control unit.

Description

DEVICE FOR AUTOMATICALLY SETTING UP THE MULTIPLE TOOL IN HOT-WIRE CUTTING MACHINES
This invention relates to a device for automatically setting up the multiple tool in hot-wire cutting machines, particularly for sheets and blocks of polystyrene and the like.
Hot-wire cutting machines for sheets and blocks of polystyrene and similar materials are known- They generally comprise a bench on which the blocks or sheets to be cut are rested, and a pair of side walls between which a plurality of metal wires are stretched transversely to said bench. When in operation, these wires are traversed by an electric current which heats them to a temperature sufficient to cause localized melting of the polystyrene. The polystyrene is cut into pieces of the required shape by the longitudinal and vertical movement of all the wires relative to the polystyrene. The movement of the metal wires relative to the bench and thus relative to the polystyrene can be obtained either by a double horizontal and vertical movement of the wire-support ing side walls relative to the fixed bench or by a double horizontal and vertical movement of said bench relative to fixed side walls, or again by a horizontal movement of the side walls and a vertical movement of the bench. The number and arrangement of the wires between the two side walls and thus the configuration of the multiple tool to be used at any given time obviously varies according to the number of polystyrene pieces to be produced, their shape and their size. The preparation of the particular tool, ie the setting up of the machine, comprises arranging the wires between the two side walls in the number and arrangement corresponding to the particular work to be carried out. This preparation is urrently done manually, and this results in a series of drawbacks which the present invention proposes to el iminate.
One of these drawbacks is that this manual involvement results in a very slow operation, requiring he simultaneous presence of two persons, one at each side wall on the one and other side of the bench, this slowness being more felt the greater the number of wires to be stretched, a number which can vary from a few tens to as many as one hundred.
further drawback is that such manual setting is valid only for the particular work in hand, and must be reversed when finished, so that the machine can be used with a different wire arrangement for the subsequent work- It is therefore necessary to re-set the cutting machine in the identical manner each time the same work is to be done, and this obviously multiplies the drawbacks which each manual setting operation involves.
All these drawbacks and others which will be apparent from the following description are obviated according to the invention by a device for automatically setting up the multiple tool in hot-wire cutting machines, particularly for sheets and blocks of polystyrene and the like, comprising a bench on which the material to be cut is rested, a pair of side walls between which a plurality of electrically heated wires are stretched, and means for longitudinally and vertically moving said side walls relative to said bench in such a manner that said wires hot-cut the material resting on said bench into the predetermined pattern, characterised in that each side wall comprises a longitudinal bar along which there are slidable a plurality of slides to which the ends of the wires are fixed and a carriage provided with a member for the removable engagement of each slide and driven under the control of an electronic control unit in order to position said slide along the respective longitudinal bar in accordance with data acquired by said control unit.
A preferred embodiment of the present invention is described hereinafter with reference to the accompanying drawings in which:
Figure 1 is a schematic plan view of a hot-wire cutting machine provided with the device according to the invention;
Figure 2 is a partial longitudinal section therethrough on the line II-II of Figure 1;
Figure 3 is an enlarged partial cross-section therethrough on the line III-III of Figure 1 in the non-operative condition; and
Figure 4 is the same view as Figure 3 but in the operative condition.
As can be seen from the figures, the machine according to the invention comprises a bench or base 1 of substantially traditional type, to the side of which there are disposed two side walls 2 each comprising a longitudinal bar 3. The purpose of the bench 1 is to support the polystyrene sheets or blocks to be cut, whereas the purpose of the longitudinal bars 3 is to support a plurality of transverse wires 4 which hot-cut the polystyrene. For this purpose the side walls 2 are mobile both axially and vertically relative to the bench 1 so as to cause the wires 4 to move relative to the polystyrene. This relative movement, which is obtained either by moving the bench 1 or by moving the side walls 2 or by moving both, is effected with traditional systems which do not form part of the invention and are not shown on the drawings for reasons of clarity.
Each longitudinal bar 3, which is constructed preferably of aluminium or another metal, is hinged to the corresponding side wall 2 by a horizontal hinge 5, the purpose of which will be apparent hereinafter, and is also provided with a longitudinal round rod 6 of conducting material such as brass, connected to theelectrical power supply. Each longitudinal bar 3 has a rail profile along which a carriage indicated overall by
7 can slide, and a plurality of slides 8 to which the ends of the wires 4 are fixed.
More specifically, the carriage 7 is provided with a stepper motor or a direct current motor controlled by an electronic control unit, not shown on the drawings. It is also provided with a pin 9 operated by a pneumatic actuator 10 which moves it axially between an advanced position in which it engages a corresponding cavity 11 of each slide 8, and a retracted position of disengagement.
In addition to the cavity 11, each slide 8 comprises a further cavity 12 housing a coil spring 13 for tensioning the corresponding wire 4.
The operation of the machine according to the invention is as follows:
with the tool "unset", all the pairs of slides 8 corresponding to the various wires 4 are side by side at one end 14 of the longitudinal bars. To set the tool, the number and arrangement of the wires 4 required for the particular work in hand are firstly established. These data can either be fed into the control unit for example via a keyboard, or can be called up from the memory if that number and arrangement have alredy been used and memorized.
When the setting command has been given, the two motors of the carriages 7, which are operated synchronously, cause the respective carriage 7 to move up to the corresponding pack of slides 8 and halt at the last slide 8a defined by the particular chosen number of wires 4. A command is now fed to the actuators 10 to cause the respective pin 9 to emerge and engage the cavity 11a of said slide 8a, and a further command is fed to the motors in the opposite sense to move those longitudinal bars 3 together with the slides 8 and thus the wires 4 required for the particular setting of the tool towards the end 15.
When the slide 8a reaches its definitive position, which is also obtained by data either fed into the electronic control unit or previously memorised, the motors are stopped and the pins 9 are disengaged from the corresponding cavity 11, so that the last wire 4a is left in its definitive position along the bars 3. The motors are then advanced through a distance equal to the thickness of the slides 8 and the pins 9 of the two carriages are again advanced to engage the corresponding cavity 11 of the adjacent slide 8b.
At this point a command is given for the carriages 7 to again move until the relative wire reaches its definitive position, and so on until all the wires 4 have been correctly posit ioned.
A subsequent command fed simultaneously to the two bars 3 causes them to rotate about the respective hinges 5 in the direction of the arrow 16 in Figure 3, so raising the round rods 6 and bringing them into contact with the wires 4 in the traditional manner. The multiple tool is now ready to operate.
To change the arrangement of the wires 4 along the bars 3, the carriages 7, which still have their pin 9 engaged in the corresponding slide of the first wire 4, are caused to move towards the end 14 of the bars, to thus pack the various pairs of slides 8 at that end, after which the previous procedure can be carried out based on data for the new arrangement to be obtained.
From the aforegoing it is apparent that the setting device according to the invention offers numerous important advantages for the entire cutting machine, and in particular:
- possible total automation of the plant,
- considerable speed and accuracy of tool setting,
- reproducibility of posit ioning.

Claims

C L A I M S
1. A device for automatically setting up the multiple tool in hot-wire cutting machines, particularly for sheets and blocks of polystyrene and the like, comprising a bench on which the material to be cut is rested, a pair of side walls between which a plurality of electrically heated wires are stretched, and means for longitudinally and vertically moving said side walls relative to said bench in such a manner that said wires hot-cut the material resting on said bench into the predetermined pattern, characterised in that each side wall (2) comprises a longitudinal bar (3) along which there are slidable a plurality of slides (8) to which the ends of the wires (4) are fixed and a carriage (7) provided with a member (9) for the removable engagement of each slide (8) and driven under the control of an electronic control unit in order to position said slide along the respective longitudinal bar (3) in accordance with data acquired by said control unit.
2. A device as claimed in claim 1, characterised in that each carriage (7) is provided with its own motor, which is synchronized with the motor of the other carriage.
3. A device as claimed in claim 1, characterised in that the drive motor of each carriage (7) is of stepper type.
4. A device as claimed in claim 1, characterised in that the drive motor of each carriage is of direct current type.
5. A device as claimed in claim 1, characterised in that each carriage (7) is provided with an actuator (10) associated with a member (9) mobile between two end positions, namely a position in which it engages and a position in which it is disengaged from one of the slides (8) slidable along said bar (3).
6. A device as claimed in claim 5, characterised in that said engagement member consists of a pin (9) positioned perpendicularly to the longitudinal axis of the corresponding bar (3) and mobile axially between a position in which it engages in a corresponding cavity (11) provided in each slide (8) and a position in which it is disengaged from said cavity.
7. A device as claimed in claim 1, characterised in that each slide (8) is provided with a cavity (12) housing a spring (13) for tensioning the corresponding wire (4).
8. A device as claimed in claim 1, characterised in that the electronic control unit comprises:
- means for acquiring data regarding the number of wires (4) to be disposed along the two longitudinal bars (3) and their corresponding position,
- means for causing the two carriages (7) to be positioned in correspondence with each slide (8),
- means for causing the corresponding carriage (7) to operate the engagement member (9) for each slide (8) in both directions.
9. A device as claimed in claim 1, characterised in that the electronic control unit comprises a keyboard for inserting the data corresponding to the position of the desired number of slides (8) along the longitudinal bars (3).
10. A device as claimed in claim 8, characterised in that the control unit comprises a memory into which the data corresponding to the desired arrangements of wires (4) can be written and from which said data can be read.
EP90904622A 1989-03-24 1990-03-19 Device for automatically setting up the multiple tool in hot-wire cutting machines Expired - Lifetime EP0466715B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8984122A IT1234363B (en) 1989-03-24 1989-03-24 AUTOMATIC TOOL EQUIPMENT OF MULTIPLE TOOL OF HOT WIRE CUTTING MACHINES
IT8412289 1989-03-24

Publications (2)

Publication Number Publication Date
EP0466715A1 true EP0466715A1 (en) 1992-01-22
EP0466715B1 EP0466715B1 (en) 1993-08-11

Family

ID=11324338

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90904622A Expired - Lifetime EP0466715B1 (en) 1989-03-24 1990-03-19 Device for automatically setting up the multiple tool in hot-wire cutting machines

Country Status (8)

Country Link
EP (1) EP0466715B1 (en)
AT (1) ATE92833T1 (en)
AU (1) AU5265890A (en)
DE (1) DE69002764T2 (en)
DK (1) DK0466715T3 (en)
ES (1) ES2043363T3 (en)
IT (1) IT1234363B (en)
WO (1) WO1990011169A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29801499U1 (en) * 1998-01-30 1999-06-02 Kurtz Altaussee Gmbh, Altaussee Cutting device for cutting thermally processable material
DE19934389A1 (en) * 1999-07-22 2001-02-01 Plasttechnik Engineering Greiz Positioning and holding equipment for expanded polystyrene block cutting wires, has adjustable wire holders which move along guide rail running parallel to the current supply rail
DE19934391A1 (en) * 1999-07-22 2001-02-01 Plasttechnik Engineering Greiz Changing cutting positions during cutting of expanded polystyrene foam blocks by moving wires from cutting position to parking position where wires can be removed or added
DE10145245C2 (en) * 2001-09-13 2003-07-31 Kurtz Altaussee Gmbh Altaussee Positioning device for cutting system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE416278B (en) * 1979-03-22 1980-12-15 Foerenade Fabriksverken METHOD AND DEVICE FOR SETTING ROLLING RINGS ON AN AXLE
DE2948609A1 (en) * 1979-12-03 1981-06-04 Walter 8135 Söcking Brüser METHOD AND DEVICE FOR CUTTING PLASTIC BLOCKS
JPS59169749A (en) * 1983-03-15 1984-09-25 Rengo Co Ltd Tool positioning method
US4599928A (en) * 1985-04-10 1986-07-15 Tom Oker Sales & Mfg., Inc. Apparatus for forming cubes from a product such as a loaf of cheese
JPH0659636B2 (en) * 1986-01-27 1994-08-10 三菱重工業株式会社 Head positioning device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9011169A1 *

Also Published As

Publication number Publication date
AU5265890A (en) 1990-10-22
ES2043363T3 (en) 1993-12-16
DE69002764D1 (en) 1993-09-16
DK0466715T3 (en) 1994-01-03
DE69002764T2 (en) 1994-01-27
IT1234363B (en) 1992-05-15
EP0466715B1 (en) 1993-08-11
IT8984122A0 (en) 1989-03-24
WO1990011169A1 (en) 1990-10-04
ATE92833T1 (en) 1993-08-15

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