EP0297324B1 - Couteau pour le découpage en feuilles - Google Patents

Couteau pour le découpage en feuilles Download PDF

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Publication number
EP0297324B1
EP0297324B1 EP19880109208 EP88109208A EP0297324B1 EP 0297324 B1 EP0297324 B1 EP 0297324B1 EP 19880109208 EP19880109208 EP 19880109208 EP 88109208 A EP88109208 A EP 88109208A EP 0297324 B1 EP0297324 B1 EP 0297324B1
Authority
EP
European Patent Office
Prior art keywords
knife
back portion
fitting groove
blanking
sheet
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
EP19880109208
Other languages
German (de)
English (en)
Other versions
EP0297324A1 (fr
Inventor
Chuji Yanagimoto
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.)
Laserck Corp
Original Assignee
Laserck Corp
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
Application filed by Laserck Corp filed Critical Laserck Corp
Publication of EP0297324A1 publication Critical patent/EP0297324A1/fr
Application granted granted Critical
Publication of EP0297324B1 publication Critical patent/EP0297324B1/fr
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
    • B26F1/44—Cutters therefor; Dies therefor
    • 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
    • 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
    • B26F1/44—Cutters therefor; Dies therefor
    • B26F2001/4463—Methods and devices for rule setting, fixation, preparing cutting dies

Definitions

  • the present invention relates to a knife for blanking sheet, which is utilized to punch a specifically shaped hole in a sheet of paper, plastic, or corrugated paper board by press blanking.
  • FIGs. 5 and 6 A prior art knife (FR-A 2 512 704) is shown in Figs. 5 and 6.
  • This knife A is made of thin strip material (of a thickness ranging from 0.4 to 1.0 mm) and has two bevelled surfaces at its blade portion so as to form a blade edge 1. It has a wedge-like shape in in cross-section.
  • a knife A is fixedly fitted, for use, in a knife fitting groove 3 arranged in a knife holding base 2 made of wood.
  • the knife fitting groove 3 is preliminarily formed into a determined configuration (according to the shape of a blank) with the use of a jig saw or by means of laser cutting.ln case the knife fitting groove 3 is cut by a laser cutting operation which has widely been employed recently, the widthwise measurements of the inner region of the knife fitting groove 3 may be found unequal although cutting into an intricate configuration is possible. if the knife A is fitted into the knife fitting groove 3 under such a condition, the knife holding base 2 is deformed. Thus, the knife fitting groove 3 should be finished appropriately with the use of a router. The knife holding base 2 securely equipped with the knife A is then attached to a blanking press (not shown) together with athin ferrous plate 11, a paper sheet 10, and a back plate 4.
  • this adjustment is made by adhesively mounting a sheet of height adjusting paper, such as a strip of tape 7, between the thin ferrous plate 11 and the back plate 4 in an area where the height h of the knife A is rather low (see Fig. 6).
  • the error in the height h of knife A likewise may be eliminated by deflecting the thin ferrous plate 11 throughout the respective area.
  • the afore-said adjustment requires a highly experienced skill and particularly has the disadvantage that it is troublesome to carry out.
  • a knife of the type shown in Fig. 7 likewise is known (FR-A 2 512 704 and GB-A1 366 757).
  • This knife B has a tapered back portion 8 the material thickness of which is less than that of the main portion of the knife. The thinner back portion can easily be deformed under pressure.
  • Knife B also is fitted into a knife fitting groove 3 formed in a knife holding base 2. Then, the knife holding base 2 is attached to a blanking press together with a thin ferrous plate 11, a paper sheet 10, and a back plate 4. During a test blanking operation, the back portion 8 is yieldingly compressed by forcefully pushing the thin ferrous plate 11. Consequently, the knife Bis partially automatically adjusted so that its height h can be uniform.
  • the back portion 8 is tapered and thinner than the knife main portion. This may cause the knife holding base 2 to be deflected when the knife B is inserted under pressure into the knife fitting groove 3. As a result, a problem may arise such that during press blanking operation, a sheet, such as a corrugated paper board 12 transported on a chain conveyor not shown, is not transferred smoothly; rather its leading end may strike the blade edge 1 of the knife B attached to the knife holding base 2 (see Fig. 8). This problem is likely to become particularly troublesome when the distance H between the blade edge 1 of the knife B and the top of the corrugated paper board 12 is adjusted to a small value (e.g. 4 to 5 mm) to speed-up the press blanking operation. Another problem is that the holding force of the knife holding base 2 for holding the knife B is lessened as the area in which knife B contacts the side wall of the knife fitting groove 3 is decreased in view of the thinner back portion 8.
  • the knife of the present invention is designed in view of the above-mentioned aspects.
  • a knife for blanking sheet having a blade portion, a main portion and a back portion, the material thickness of the back portion being less than that of the main portion, the back portion and a part of the main portion being fitted in a knife fitting groove arranged in a knife holding base, is characterized in that consecutive sections along the length of the back portion are deformed in alternate transverse directions in such a manner that the overall thickness of the back portion is equivalent to that of the main portion.
  • This configuration of the back portion of the knife provides for an extended area of contact thereof with the side wall of the knife fitting groove. Accordingly the holding force of the knife holding base for holding the knife is increased. Additionally, the pressing forces on the side wall of the knife fitting groove become uniform, whereby the deflection of the knife holding base will be minimized.
  • the height of the knife is automatically adjusted to be uniform because higher ends of the back portion thereof are yieldingly compressed upon forcefully striking the usually employed thin ferrous plate.
  • the back portion thereof when the knife is fitted into the knife fitting groove in the knife holding base, the back portion thereof will deflect according to the width of the knife fitting groove or else, the contacting are of the side wall of the knife fitting groove to the back portion will partially yield to pressure under the stresses exerted thereon. Accordingly, the work of finishing the knife fitting groove with a router may be omitted.
  • Figs. 1 (a), 1 (b) and 1 (c) illustrate one embodiment of the knife of the present invention, in which:
  • the back portion 8' of a knife C is tapered and has a material thickness which is less than that of the main portion of the knife. Consecutive sections along the length of back portion 8', are deformed in alternate transverse directions such that a wave-shaped configuration is obtained.
  • the wave-shaped portion is formed by a pressing operation in such a manner that the overall thickness (represented by t in Fig. 1 (b)) of the back portion is equivalent to that of the main portion of the knife C.
  • the knife C also has two bevelled surfaces so as to form a blade edge 1.
  • the knife C can be fitted into the knife fitting groove 3 as its back portion 8' deflects throughout the knife fitting groove 3 or as the contacting area of the side wall of the knife fitting groove 3 with the back portion 8', partially deflects due to a stress intensively exerted thereon, even in case that the knife fitting groove 3 is not uniform in width after having been cut e.g. by a laser cutting operation. Therefore, a finishing work with the use of a router after laser cutting operation may be omitted.
  • the knife holding base 2 having the knife C fixedly fitted in the knife fitting groove 3 therein is then attached to a blanking press (not shown) together with a thin ferrous plate 11, a sheet 10, and a back plate 4.
  • a region of the back portion 8' where the height h of the knife C becomes greatest is yieldingly compressed by the thin ferrous plate 11 under the pressure exerted during the test blanking operation (see Fig. 2). This allows the height h of become automatically uniformly adjusted.
  • a knife G is arranged in such a way that its back portion 8' is formed into a plurality of tongues 9 flexed in alternate transverse directions.
  • a knife D has a single bevelled surface so as to form a blade edge 1'.

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)

Claims (5)

1. Couteau (C, D, G) pour le découpage d'une feuille, comportant une partie à lame, une partie principale et une partie arrière (8'), l'épaisseur de la matière de la partie arrière étant inférieure à celle de la partie principale, la partie arrière (8') et une portion de la partie principale étant logées dans une gorge (3) de logement de couteau agencée dans une embase (2) de support de couteau, caractérisé en ce que des sections consécutives sur la longueur de la partie arrière (8') sont déformées dans des directions transversales alternées de manière que l'épaisseur globale (t) de la partie arrière (8') soit équivalente à celle de la partie principale.
2. Couteau (C) pour le découpage d'une feuille selon la revendication 1, dans lequel la partie arrière (8') est de forme ondulée.
3. Couteau (G) pour le découpage d'une feuille selon la revendication 1, dans lequel la partie arrière (8') comprend plusieurs languettes (9) fléchies dans des directions alternées.
4. Couteau (C, G) pour le découpage d'une feuille selon les revendications 1, 2 ou 3, dans lequel sa partie à lame présente deux surfaces biseautées afin de former une arête (1) de lame.
5. Couteau (D) pour le découpage d'une feuille selon les revendications 1, 2 ou 3, dans lequel sa partie à lame présente une surface biseautée de façon à former une arête (1') de lame.
EP19880109208 1987-06-10 1988-06-09 Couteau pour le découpage en feuilles Expired EP0297324B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP145590/87 1987-06-10
JP14559087A JPS63312099A (ja) 1987-06-10 1987-06-10 シ−ト打抜用ナイフ

Publications (2)

Publication Number Publication Date
EP0297324A1 EP0297324A1 (fr) 1989-01-04
EP0297324B1 true EP0297324B1 (fr) 1990-10-03

Family

ID=15388603

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880109208 Expired EP0297324B1 (fr) 1987-06-10 1988-06-09 Couteau pour le découpage en feuilles

Country Status (3)

Country Link
EP (1) EP0297324B1 (fr)
JP (1) JPS63312099A (fr)
DE (1) DE3860739D1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5370028A (en) * 1989-08-31 1994-12-06 Karl Marbach Gmbh & Co. Strip steel punching and indenting tool
DE3928916C1 (fr) * 1989-08-31 1991-01-24 Karl Marbach Gmbh & Co, 7100 Heilbronn, De
CH680842A5 (fr) * 1989-09-22 1992-11-30 Electro Optic Ag
JPH05212699A (ja) * 1992-02-03 1993-08-24 Nippon Daisuchiile Kk 紙器型抜装置に用いる抜型および該抜型の製造方法
JPH05293797A (ja) * 1992-04-17 1993-11-09 Rezatsuku:Kk ナイフの加工方法
JPH0650797U (ja) * 1992-11-30 1994-07-12 攘治 大塚 簡易ステ刃
CH687448A5 (de) * 1993-11-26 1996-12-13 Lande Wellpappen Ag Vorrichtung fuer den Bandschnitt von Flaechengebilden.
AU1352897A (en) * 1996-01-26 1997-08-20 Kimberly-Clark Worldwide, Inc. A die cutting insert for a rotary die cutter and the die cutter itself
US6250189B1 (en) * 1996-06-21 2001-06-26 Kimberly-Clark Worldwide, Inc. Rotary die cutter
US6055897A (en) * 1996-06-21 2000-05-02 Kimberly-Clark Worldwide, Inc. Die cutting insert for a rotary die cutter and the die itself
JP2002165948A (ja) * 2000-12-05 2002-06-11 Heiwa Corp 遊技盤の加工方法
EP2159017A1 (fr) * 2008-08-28 2010-03-03 Cartoproject S.r.l. Filière de découpage à plat et son procédé de configuration
SE534677C2 (sv) * 2010-03-23 2011-11-15 Sandvik Intellectual Property Stålstanskniv
CN102248557A (zh) * 2011-04-06 2011-11-23 昆山市三和兴激光刀模有限公司 一种新型刀模的制作工艺
JP7064729B1 (ja) * 2021-07-08 2022-05-11 株式会社ティーエスインダストリー シート状ワークの打抜き刃

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1366757A (en) * 1973-07-10 1974-09-11 Coxhead A Cutting presses for manufacturing carton blanks and the like
DE3135980C1 (de) * 1981-09-11 1983-06-01 Karl Marbach Gmbh & Co, 7100 Heilbronn Bandstahlstanzwerkzeug mit mindestens einem eine Schneide aufweisenden bandförmigen Stanzmesser

Also Published As

Publication number Publication date
EP0297324A1 (fr) 1989-01-04
JPS63312099A (ja) 1988-12-20
JPH0558878B2 (fr) 1993-08-27
DE3860739D1 (de) 1990-11-08

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