EP0155665A2 - Vorrichtung zum Schneiden unter Unterdruck eines auf der Rückseite mit Schaumstoff versehenen Materials - Google Patents

Vorrichtung zum Schneiden unter Unterdruck eines auf der Rückseite mit Schaumstoff versehenen Materials Download PDF

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Publication number
EP0155665A2
EP0155665A2 EP85103113A EP85103113A EP0155665A2 EP 0155665 A2 EP0155665 A2 EP 0155665A2 EP 85103113 A EP85103113 A EP 85103113A EP 85103113 A EP85103113 A EP 85103113A EP 0155665 A2 EP0155665 A2 EP 0155665A2
Authority
EP
European Patent Office
Prior art keywords
die
rule
cutting
steel rule
layers
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
EP85103113A
Other languages
English (en)
French (fr)
Other versions
EP0155665B1 (de
EP0155665A3 (en
Inventor
Martin M. Levene
William W. Lessard
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.)
Ontario Die Co Ltd
Original Assignee
Ontario Die Co Ltd
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
Priority claimed from US06/590,961 external-priority patent/US4543862A/en
Priority claimed from US06/690,159 external-priority patent/US4672870A/en
Application filed by Ontario Die Co Ltd filed Critical Ontario Die Co Ltd
Publication of EP0155665A2 publication Critical patent/EP0155665A2/de
Publication of EP0155665A3 publication Critical patent/EP0155665A3/en
Application granted granted Critical
Publication of EP0155665B1 publication Critical patent/EP0155665B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/40—Cutting-out; Stamping-out using a press, e.g. of the ram type

Definitions

  • Steel rule dies are commonly used for cutting cloth and clothlike materials such as natural textiles, and synthetic materials such as vinyl. Steel rule dies are particularly advantageous in the repetitive cutting of specific shapes such as apparel, automobile upholstery and trim panels, and the like.
  • a steel rule die typically comprises a base or backing board in which a slot or groove matching the pattern to be cut is sawn, and a length of steel rule embedded in the board with the sharpened exposed upper edge extending therefrom. The die is used in combination with a cutting pad and a press which may either be single-cut, progressive, or increment feed.
  • foam-backed materials foam rubber, waddings, battings, paddings, high pile materials, and other fluffy or spongy materials.
  • a stack or a particularly thick single layer of such materials is sufficiently unstable that an accurate cut is often not possible using conventional techniques.
  • the present invention is directed toward the design and use of stationary steel rule cutting dies with air-evacuation compression so as to facilitate and improve the use of such dies to cut compressible materials.
  • the invention comprises a base, a steel rule having an exposed upper sharpened edge and being fixed to the base for defining the pattern to be cut, so as to receive a stack of compressible material layers substantially on said steel rule upper edge, air impervious cover means for covering the stacked layers and the base to define a vacuum chamber, and means for evacuating the vacuum chamber to compress and reduce the thickness of the stack of layers before cutting same with said rule.
  • the die of the subject invention is used in combination with a press of either the single stroke or progressive or incremental feed type.
  • the base containing the steel rule is placed on a horizontal support surface with the sharpened upper edge of the rule facing upwardly, the materials are stacked on top of the rule and the press is oriented over the die so as to push the stack of materials against the sharpened upper edge of the rule to perform the cutting action.
  • a pad or board of rigid but relatively soft material is placed over the stack of material to be cut so that the steel rule cutting edge works against and actually penetrates slightly into the board and the board functions to maintain the vacuum condition even in the-event of damage to the air impervious sheet.
  • the board can be placed either over or under the air-impervious sheet. Where ease of handling is the overriding consideration, the board may be placed over the air impervious sheet. However, in most situations it is preferable to place the board under the sheet since this eliminates periodic replacement of the sheet and, very importantly, precludes horizontal compression of the stacked material during the cutting operation and thereby significantly improves the accuracy of the cut and the resulting dimensional uniformity of the cut pieces.
  • the steel rule forms a closed figure and the vacuum source is external of the die it is sometimes necessary to vent the interior of the closed figure defined by the steel rule to the external area of the die.
  • the steel rule is formed with regular-occuring gaps in the unsharpened side of the rule so as to provide vents to equalize pressure as between the inside and outside of any closed figure formed by the rule.
  • Compressible members are provided on the base adjacent to the rule for supporting the compressible material layers substantially level with the upper cutting edge of the rule.
  • the compressible members are open celled to act as a conduit to facilitate evacuation of the vacuum chamber, and compress in response to downward movement of the upper platen to allow the cutting edge of the rule to move through the layers of stacked materials.
  • a groove is formed in the base adjacent but outside of the rule, the groove is connected to suitable vacuum pump means, and open celled compressible members are positioned between the groove and the outer perimeter of the rule.
  • an upstanding collar member extends around the outside of the groove and a rigid perforate plate covers the groove with an open celled compressible member positioned between the collar and the rule and overlying the perforate plate.
  • the base of the steel rule die is supported on a die carrier and the die carrier includes means which are operative to exhaust air from a vacuum chamber formed beneath the air-impervious cover to compress and reduce the thickness of the'stacked materials prior to the cutting operation.
  • the die carrier defines a suitable vacuum surface and the steel rule die defines a vacuum surface generally conforming in size and shape to the vacuum surface on the die carrier so that the steel rule die may be positioned on the die carrier with the vacuum surface on the steel rule die intimately juxtaposed to the carrier vacuum surface to allow evacuation of the vacuum chamber. This arrangement obviates the need for a vacuum device as a part of each steel rule die.
  • the die includes a conduit for communicating the vacuum chamber with a suitable vacuum pump means and a check valve is provided in the conduit which functions upon disconnection of the conduit from the vacuum pump means to maintain the vacuum condition in the vacuum chamber.
  • the invention embodied in the apparatus of FIGURES 1-5 comprises a base 10 of thick plywood board having a wide rectangular groove 12 formed in the upper surface thereof and communicating with a cylindrical channel 14 which extends to the outer edge of the base board 10.
  • the upper surface also has sawn therein an inner slot 16 defining major co-planar surfaces 18 and 20.
  • a strip of steel rule- 22 is formed into a shape congruent with the slot 16 and in the present invention is specially formed to exhibit slots 24 in the bottom or blunt edge thereof for purposes to be described.
  • the steel rule 22 is sharp and, in some cases, serrated along the upper exposed edge and is driven into the slot 16 of the plywood base 10.
  • rule 22 forms a closed figure. Accordingly, the slots 24 are formed in the bottom or blunt end of the rule with a height exceeding the extent to which the rule is driven into the board 10 so as to provide air communication passages between the interior of the figure formed by the rule 22 and the volume represented by the slot 12 in board 10.
  • a perforated plate 26 having a substantially quadrangular configuration is placed over the slot 12 and, as best shown in Figure 2, extends substantially up to the exterior lateral surface of the rule 22.
  • a collar 28 of air tight material such as closed cell plastic or rubber is placed on the surface 20 of the board 10 and is filled in the volume between the collar 28 and the rule 22 with open cell foam 30.
  • the interior of the figure formed by the rule 22 is filled with open cell foam 32 which rests on surface 18.
  • the foam elements 30 and 32 essentially provide a compressible support surface for a stack 34 of compressible materials to be cut using the die shown in the drawing such that the materials do not have to rest directly on the exposed edge of the rule 22.
  • the stack of 34 is then topped with a board 38 and, finally, covered by a thin, flexible, but air-tight, plastic shroud 36 defining an air-impervious cover or shroud which is preferably substantially larger than the die apparatus so as to be capable of extending beyond the lateral boundaries thereof and onto a flat support surface such as one might find in a typical workshop where flatbed die cutting operations are carried on.
  • Board 38 must be substantially rigid but must have a surface that is soft enough to allow at least slight penetration by rule 22.
  • Board 38 may, for example, comprise a sheet of polypropylene, nylon, vinyl, urethane, or vinyl coated woven fabric material.
  • Board 38 lies between the cutting edge of rule 22 and the sheet 36 to prevent cutting of the sheet and loss of vacuum during the press-cutting operation. Board 38 in effect becomes a part of the cover sheet and maintains the vacuum condition even in the event that the cover sheet is damaged. Board 38 also functions during the cutting operation to preclude horizontal compression of the stacked materials.
  • the assembled die comprising elements 10, 22, 26, 28, 30 and 32 is placed on a flatbed die cutting table and the stack 34 of compressible materials is placed in position over the sharp cutting edge of the rule 22.
  • Board 38 is placed over the stack 34.
  • Cover sheet 36 is placed over the assembly and pulled down tight against the surface of the table and a vacuum source is attached to fitting 42 which is placed in the channel 14 shown in Figure 1.
  • the original uncompressed condition is represented in Figure 3 wherein the stack 34 may be on the order of five or six inches in vertical thickness.
  • the "cutting- ready" condition is represented in Figure 4 where sufficient air has been drawn out from under the cover sheet 36 to vertically reduce the height of the stack 34 down to about 1" or 1 1/2" without any lateral or horizontal distortion.
  • Board 38 serves not only as a surface that the steel rule cuts against but also serves as a seal so that air, which has been drawn out from under cover sheet 36, cannot re-enter the enclosed environment with a resultant loss of vacuum and loss of compression of the stacked materials.
  • FIGURE 5 shows an alternative embodiment where the steel rule 22 cuts against a belt-type pad 38a which is made of woven synthetic material coated! impregnated with urethane or the like to form a tough, somewhat flexible pad.
  • the pad 38a is outside of the shroud sheet 36 such that the sheet is cut by the rule 22 with each operation of press 40.
  • this inconvenience is offset by the fact that handling of pad 38a is made easier by attachment to the press 40 and by advancement thereof between supply and take-up devices 44 and 46, respectively.
  • FIGURES 6 and 7 identical reference numerals have been used to identify elements in the structure of FIGURES 6 and 7 that substantially correspond to elements in the FIGURES 1-5 embodiment.
  • an elongated rectangular plywood board 10 is formed with a wide rectangular groove 12
  • a steel rule 22 is driven into board 10 within groove 12
  • an open cell foam member 32 fills the interior of steel rule 22
  • an open cell foam member 30 extends around the exterior of steel rule 22 within groove 12.
  • Groove 12 in this embodiment includes portions 12a extending transversely and longitudinally beneath the steel rule to form a grid network within the exterior groove 12.
  • the stack 34 of compressible material is placed in position over the sharp cutting edge of the rule 22, a board 38 is placed over the stack 34, a cover sheet 36 is placed over the assembly and pulled down tight against the edges of board 10 to form a vacuum chamber, and air is evacuated from the vacuum chamber through a suitable conduit 48 secured to an end edge of board 10 and communicating with groove 12.
  • the upper press platen (not shown) is operated to drive the stack 34 down over the rule 22, compressing the foam plastic support materials 30 and 32 until all of the layers of material in the stack 34 are cut. Note that this embodiment dispenses with the collar 28 and perforated plate 26 of the FIGURES 1-5 embodiment.
  • the die assembly includes a die carrier forming a part of the feed system of the press in which the cutting operation is performed.
  • the steel rule die in this embodiment includes a plywood board 10, a steel rule 22 mounted in board 10, an open cell foam member 32 filling the interior of rule 22, and an open cell_foam member 30 positioned around the exterior of steel rule 22.
  • the die carrier seen generally at 50, includes a base plate 52 and a fence member 54 upstanding from and extending around the peripheral edge of base plate 52.
  • Base plate 52 is in the form of an elongated rectangle with long side edges 52a, 52b and short end edges 52c, 52d.
  • Fence member 54 comprises metal tubing of rectangular cross section extending in a closed loop around all four edges of base plate 52.
  • Tubing 54 includes an inperforate bottom wall 54a, an imperforate outer wall 54b, a perforate top wall 54c, and a perforate inner wall 54d forms a vacuum channel
  • Tubular fence 54 extends upwardly above the surface of plate 52 by a distance generally corresponding to the composite height of the steel rule die, and the interior area bounded by fence 54 generally corresponds in size and configuration to board 10 of the steel rule die.
  • the steel rule die is positioned on plate 52 within tubing 54 ( 56 with_the outer edge surfaces of open cell foam member 30 intimately juxtaposed to the respective perforate inner walls 54d of tubing 54.
  • Stack 34 of compressible materials is placed in position over the sharp cutting edge of rule 22, board 38 is placed over stack 34, cover sheet 36 is placed over the assembly and pulled down tight against the periphery of the die carrier to form a vacuum chamber, and air is evacuated from the vacuum chamber through a suitable tubular fitting 58 received in an opening in the outer wall 54b of tubular fence 54 along the end edge 52d of base plate 52.
  • FIGURES 8 and 9 obviates the need for a separate vacuum system in each steel rule die since the vacuum system is provided on the die carrier and the same die carrier may be used with a multitude of different steel rule dies.
  • FIGURE 10 discloses a check valve to be used with any of the disclosed steel rule die cutting arrangements.
  • the check valve is disclosed in conjunction with conduit 58 of the FIGURES 8 and 9 embodiment, the check valve could also be used with the fitting 48 of FIGURES 6 and 7 embodiment or with the conduit 42 of the FIGURES 1-5 embodiment.
  • the check valve may take various forms.
  • the check valve includes a lightweight hollow ball 60 coacting with a seat 64 formed in a portion 66 in an enlarged portion 58a of conduit 58.
  • the free end of conduit 58 is adapted to receive a vacuum hose 68 which in turn is adapted to be connected to a suitable vacuum pump (not shown).
  • the vacuum pump is operated to suck air out of the vacuum chamber beneath the cover with the ball 60 lifting off of seat 64 to allow the escape of air from the vacuum chamber.
  • the drive assembly is moved in the direction of the arrow in FIGURE 8 into a press (not shown) which makes a series of successive hits or cuts on the stacked sheets as the die assembly is fed progressively into and through the press.
  • the vacuum hose 68 is removed from conduit 58 as the vacuum hose is removed, ball 60 seats against seat 64 under the urging of the differential pressure acting on the ball to maintain the established vacuum condition in the vacuum chamber as the die assembly continues its movement through the press.
  • This arrangement avoids the necessity of having the vacuum hose move through the press and thereby greatly simplifies the overall cutting operation.

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  • 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)
EP19850103113 1984-03-19 1985-03-18 Vorrichtung zum Schneiden unter Unterdruck eines auf der Rückseite mit Schaumstoff versehenen Materials Expired EP0155665B1 (de)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US590961 1984-03-19
US06/590,961 US4543862A (en) 1984-03-19 1984-03-19 Vacuum die cutting apparatus for foam backed materials
US65774784A 1984-10-04 1984-10-04
US690159 1985-01-10
US06/690,159 US4672870A (en) 1984-10-04 1985-01-10 Vacuum die cutting apparatus for foam backed materials
US657747 1991-02-19

Publications (3)

Publication Number Publication Date
EP0155665A2 true EP0155665A2 (de) 1985-09-25
EP0155665A3 EP0155665A3 (en) 1986-08-06
EP0155665B1 EP0155665B1 (de) 1990-07-25

Family

ID=27416590

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850103113 Expired EP0155665B1 (de) 1984-03-19 1985-03-18 Vorrichtung zum Schneiden unter Unterdruck eines auf der Rückseite mit Schaumstoff versehenen Materials

Country Status (3)

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EP (1) EP0155665B1 (de)
CA (1) CA1232533A (de)
DE (1) DE3578791D1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0271116A1 (de) * 1986-12-15 1988-06-15 Investronica S.A. Schneidtisch mit Vakuum-Ansaugung
WO1996034725A1 (en) * 1995-05-01 1996-11-07 Korpak Limited Cutting and creasing apparatus
GB2314801A (en) * 1995-05-01 1998-01-14 Korpak Ltd Cutting and creasing apparatus
US20150352741A1 (en) * 2013-01-08 2015-12-10 Tek Industries, Inc. Multi-die cut with common axis
FR3108923A1 (fr) * 2020-04-07 2021-10-08 David GENEVIER Procédé de fabrication en grandes séries d’éléments unitaires par découpe de matériaux souples

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19956488C2 (de) * 1999-11-24 2002-11-21 Ernst Biermann Verfahren zum Herstellen von Zuschnitten aus Verbundstoffen

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2217060A (en) * 1938-08-04 1940-10-08 Lawrence S Korsen Cutting of leather
US3598006A (en) * 1970-02-02 1971-08-10 Gerber Garment Technology Inc Method for working on sheet material and other objects
DE1610730A1 (de) * 1965-03-18 1972-05-25 Bianchi Vittorio Louis Achille Vorrichtung zum Stapeln und Handhaben von Werkzeugtraegerplatten fuer Stanzpressen
CH535099A (de) * 1971-12-17 1973-03-31 Verres Ind Sa Spannvorrichtung mit Grundplatte, um ein im wesentlichen gasundurchlässiges Flächengebilde, insbesondere eine flexible Kunststoffolie, lösbar auf der Grundplatte zu halten
US3777604A (en) * 1972-04-25 1973-12-11 Gerber Garment Technology Inc Apparatus for supporting a stack of sheet material being cut or otherwise worked on
US3815221A (en) * 1973-05-21 1974-06-11 Gerber Garment Technology Inc Method for holding sheet material by a vacuum holddown
US4060016A (en) * 1976-07-26 1977-11-29 Gerber Garment Technology, Inc. Method and apparatus for blanking out pattern pieces from a layup
GB2032322A (en) * 1978-05-19 1980-05-08 Carr D Cutting and creasing of blanks of cardboard or the like

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2217060A (en) * 1938-08-04 1940-10-08 Lawrence S Korsen Cutting of leather
DE1610730A1 (de) * 1965-03-18 1972-05-25 Bianchi Vittorio Louis Achille Vorrichtung zum Stapeln und Handhaben von Werkzeugtraegerplatten fuer Stanzpressen
US3598006A (en) * 1970-02-02 1971-08-10 Gerber Garment Technology Inc Method for working on sheet material and other objects
CH535099A (de) * 1971-12-17 1973-03-31 Verres Ind Sa Spannvorrichtung mit Grundplatte, um ein im wesentlichen gasundurchlässiges Flächengebilde, insbesondere eine flexible Kunststoffolie, lösbar auf der Grundplatte zu halten
US3777604A (en) * 1972-04-25 1973-12-11 Gerber Garment Technology Inc Apparatus for supporting a stack of sheet material being cut or otherwise worked on
US3815221A (en) * 1973-05-21 1974-06-11 Gerber Garment Technology Inc Method for holding sheet material by a vacuum holddown
US4060016A (en) * 1976-07-26 1977-11-29 Gerber Garment Technology, Inc. Method and apparatus for blanking out pattern pieces from a layup
GB2032322A (en) * 1978-05-19 1980-05-08 Carr D Cutting and creasing of blanks of cardboard or the like

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0271116A1 (de) * 1986-12-15 1988-06-15 Investronica S.A. Schneidtisch mit Vakuum-Ansaugung
WO1996034725A1 (en) * 1995-05-01 1996-11-07 Korpak Limited Cutting and creasing apparatus
GB2314801A (en) * 1995-05-01 1998-01-14 Korpak Ltd Cutting and creasing apparatus
GB2314801B (en) * 1995-05-01 1999-03-10 Korpak Ltd Cutting and creasing apparatus
US6039101A (en) * 1995-05-01 2000-03-21 Korpak Limited Cutting and creasing apparatus
US20150352741A1 (en) * 2013-01-08 2015-12-10 Tek Industries, Inc. Multi-die cut with common axis
US10828795B2 (en) * 2013-01-08 2020-11-10 Tek Industries, Inc. Multi-die cut with common axis
FR3108923A1 (fr) * 2020-04-07 2021-10-08 David GENEVIER Procédé de fabrication en grandes séries d’éléments unitaires par découpe de matériaux souples

Also Published As

Publication number Publication date
EP0155665B1 (de) 1990-07-25
EP0155665A3 (en) 1986-08-06
DE3578791D1 (de) 1990-08-30
CA1232533A (en) 1988-02-09

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