EP0297324A1 - Knife for blanking in sheet - Google Patents
Knife for blanking in sheet Download PDFInfo
- Publication number
- EP0297324A1 EP0297324A1 EP88109208A EP88109208A EP0297324A1 EP 0297324 A1 EP0297324 A1 EP 0297324A1 EP 88109208 A EP88109208 A EP 88109208A EP 88109208 A EP88109208 A EP 88109208A EP 0297324 A1 EP0297324 A1 EP 0297324A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- knife
- blanking
- back portion
- fitting groove
- 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.)
- Granted
Links
Images
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 in a sheet of thin strip (referred to as a knife hereinafter), which is utilized to punch a specifically shaped hole in a sheet of paper, plastic, or corrugated paper board by press blanking.
- the prior art knife A illustrated is of thin strip (of thickness ranging from 0.4 to 1.0 mm) and has two bevelled surfaces in its blade end. It is formed of wedge-like shape in cross section.
- the 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.
- the widthwise measurements of the inner region of the knife fitting groove 3 may be found unequal although the 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 becomes deflected. Thus, the knife fitting groove 3 should be finished appropriately with the use of a router.
- the knife holding base 2 equipped securely with the knife A is then attached to a blanking press (not shown) together with a thin ferrous plate 11, a paper sheet 10, and a back plate 4.
- a blanking press not shown
- its height h alters to a very slight degree at the corner portions 5 of the knife A and thus, should appropriately be adjusted by the operator prior to blanking operation.
- an inherent error in the height h of the knife A is also corrected.
- this adjustment is made in a such way that a sheet of height adjusting paper such as a strip of tape 7 is adhesively mounted between the thin ferrous plate 11 and the back plate 4 to an area where the height h of the knife A is rather low (See Fig. 6). Additionally, the error in the height h of knife A is eliminated by deflecting the thin ferrous plate 11 throughout the area.
- the knife B has a back portion 8 thereof formed in thinner relationship into a tapered configuration, as shown in Fig. 7.
- the thinner portion can easily be deformed under pressure.
- the knife B in such an arrangement is also 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 test blanking operation,the back portion 8 is yieldingly compressed upon forcefully pushing the thin ferrous plate 11. Consequently, the knife B is partially adjusted automatically so that its height h can be uniform.
- the back portion 8 is tapered and rather thinner in shape, as described above. This causes the knife holding base 2 to deflect fairly when the knife B is inserted into the knife fitting groove 3 under pressure.
- 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 as with its leading end striking the blade end 1 of the knife B attached to the knife holding base 2 (See Fig. 8).
- the problem is likely to become more troublesome because the distance H between the blade end 1 of the knife B and the top of the corrugated paper board 12 is substantially adjusted to a small value (e.g. 4 to 5 mm) in relation to the speed-up in press blanking operation required in these days.
- a small value e.g. 4 to 5 mm
- the present invention is designed in view of the above mentioned aspects.
- the present invention is directed toward a knife having a back portion thereof formed in thinner relationship and fixedly fitted in a knife fitting groove arranged in a knife holding base, in which the back portion is repeatedly flexed thicknesswisely thereof.
- the height of the knife is automatically adjusted to be uniform as higher ends of the back portion thereof are yieldingly compressed upon forcefully striking the 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 areas of the side wall of the knife fitting groove to the back portion will partially yield to pressure under the stresses exerted intensively 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:
- a knife C in the primary embodiment has a back portion 8′ arranged in a thinner tapered shape and repeatedly flexed thicknesswisely thereof in wave-shaped relationship, as shown in Figs. 1 (a), 1 (b), and 1 (c).
- the wave-shaped portion is formed by pressing operation so as to stay within a range of the thickness (represented by t in Fig. 1 (b)) of the knife C.
- the knife C also has two bevelled surfaces in its blade end.
- 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 to 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 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 with the thin ferrous plate 11 under pressure during the test blanking operation (See Fig. 2). This allows the height h to become uniform automatically in adjustment.
- a knife G is arranged in such a way that its back portion 8′ is formed into a plurality of tongues 9 alternately flexed thickness strictlywisely thereof.
- a knife D has a 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)
Abstract
Description
- The present invention relates to a knife for blanking in a sheet of thin strip (referred to as a knife hereinafter), which is utilized to punch a specifically shaped hole in a sheet of paper, plastic, or corrugated paper board by press blanking.
- A knife in the prior art, for example, shown in Figs. 5 and 6 has been introduced.
- The prior art knife A illustrated is of thin strip (of thickness ranging from 0.4 to 1.0 mm) and has two bevelled surfaces in its blade end. It is formed of wedge-like shape in cross section. The knife A is fixedly fitted, for use, in a
knife fitting groove 3 arranged in a knife holdingbase 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. In case that theknife fitting groove 3 is cut by the laser cutting operation which has widely been employed recently, the widthwise measurements of the inner region of theknife fitting groove 3 may be found unequal although the cutting into an intricate configuration is possible. If the knife A is fitted into the knife fittinggroove 3 under such a condition, theknife holding base 2 becomes deflected. Thus, theknife fitting groove 3 should be finished appropriately with the use of a router. - The
knife holding base 2 equipped securely with the knife A is then attached to a blanking press (not shown) together with a thinferrous plate 11, apaper sheet 10, and aback plate 4. Particularly, while the knife A is fitted into the knife fittinggroove 3, its height h alters to a very slight degree at thecorner portions 5 of the knife A and thus, should appropriately be adjusted by the operator prior to blanking operation. At the same time, an inherent error in the height h of the knife A is also corrected. - During trial blanking operation, this adjustment is made in a such way that a sheet of height adjusting paper such as a strip of
tape 7 is adhesively mounted between the thinferrous plate 11 and theback plate 4 to an area where the height h of the knife A is rather low (See Fig. 6). Additionally, the error in the height h of knife A is eliminated by deflecting the thinferrous plate 11 throughout the area. - However, the aforesaid adjustment requires a highly experienced technical skill and particularly, has a disadvantage that it is troublesome to carry out.
- On the other hand, a knife B shown in Fig. 7 has been developed.
- The knife B has a
back portion 8 thereof formed in thinner relationship into a tapered configuration, as shown in Fig. 7. The thinner portion can easily be deformed under pressure. - The knife B in such an arrangement is also fitted into a
knife fitting groove 3 formed in aknife holding base 2. Then, theknife holding base 2 is attached to a blanking press together with a thinferrous plate 11, apaper sheet 10, and aback plate 4. During test blanking operation,theback portion 8 is yieldingly compressed upon forcefully pushing the thinferrous plate 11. Consequently, the knife B is partially adjusted automatically so that its height h can be uniform. - However, in the arrangement of the knife B, the
back portion 8 is tapered and rather thinner in shape, as described above. This causes the knife holdingbase 2 to deflect fairly when the knife B is inserted into theknife fitting groove 3 under pressure. - 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 as with its leading end striking theblade end 1 of the knife B attached to the knife holding base 2 (See Fig. 8). - Particularly, the problem is likely to become more troublesome because the distance H between the
blade end 1 of the knife B and the top of thecorrugated paper board 12 is substantially adjusted to a small value (e.g. 4 to 5 mm) in relation to the speed-up in press blanking operation required in these days. - Additionally, there is another problem that the holding force of the knife holding
base 2 for holding the knife B is lessened as the contacting area of the knife B to the side wall of theknife fitting groove 3 decreases particularly in the thinner region of theback portion 8. - The present invention is designed in view of the above mentioned aspects.
- The present invention is directed toward a knife having a back portion thereof formed in thinner relationship and fixedly fitted in a knife fitting groove arranged in a knife holding base, in which the back portion is repeatedly flexed thicknesswisely thereof.
- For the reason that the back portion of the knife is repeatedly flexed thicknesswisely thereof although it is less in thickness, an extended contacting area thereof to the side wall of the knife fitting groove can be ensured. Accordingly, the holding force of the knife holding base for holding a 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.
- Furthermore, for adjustment of the height of knife, the height of the knife is automatically adjusted to be uniform as higher ends of the back portion thereof are yieldingly compressed upon forcefully striking the thin ferrous plate. Thus, an operator who is less experienced in the adjustment can carry out the operation of adjustment with ease.
- Moreover, 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 areas of the side wall of the knife fitting groove to the back portion will partially yield to pressure under the stresses exerted intensively 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:
- Fig. 1 (a) is a perspective view; Fig. 1 (b) is a plan view taken from the direction of arrow E of fig. 1 (a); and Fig. 1 (c) is a cross sectional view taken along the line F-F′ of Fig. 1 (a).
- Fig. 2 is a cross sectional side view showing that the knife is fixedly fitted in a knife fitting groove arranged in a knife holding base while the height of the knife has been adjusted.
- Fig. 3 is a perspective view showing another embodiment of the knife of the present invention.
- Fig. 4 is a view similar to Fig. 1 (c), showing a further embodiment of the knife of the present invention.
- Fig. 5 is a perspective view showing the knife prior to installation to a knife holding base explanatorily in respect of an background art of the present invention.
- Fig. 6 is a view similar to Fig. 2, showing a prior art knife.
- Fig. 7 is a view similar to Fig. 2, showing another prior art knife.
- Fig. 8 is an explanatory view showing an operation of press blanking.
- Similar elements including such as those of the prior art knives A and B shown in Figs. 6 and 7 are represented by similar numerals in this description.
- A knife C in the primary embodiment has a
back portion 8′ arranged in a thinner tapered shape and repeatedly flexed thicknesswisely thereof in wave-shaped relationship, as shown in Figs. 1 (a), 1 (b), and 1 (c). - The wave-shaped portion is formed by pressing operation so as to stay within a range of the thickness (represented by t in Fig. 1 (b)) of the knife C.
- The knife C also has two bevelled surfaces in its blade end.
- When the knife C in the above arrangement is fitted into a knife fitting
groove 3 formed in aknife holding base 2, the convex sides of theback portion 8′ arranged in wave configuration come in contact with the side wall of theknife fitting groove 3. Thus, the contact areas of the knife C to the side wall of the knife fittinggroove 3 are positively ensured with help of the spring action resulting from the wave form thereof. As a result, the holding force of the knife holdingbase 2 for holding the knife C will be increased. - Additionally, for the reason that the spring action is also effected by the
back portion 8′ of the knife C, the knife C can be fitted into theknife fitting groove 3 as itsback portion 8′ deflects throughout the knife fittinggroove 3 or as the contacting area of the side wall of theknife fitting groove 3 to theback portion 8′ partially deflects due to a stress intensively exerted thereon, even in case that theknife fitting groove 3 is not uniform in width after having been cut e.g. by 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 theknife fitting groove 3 therein is then attached to a blanking press (not shown) together with a thinferrous plate 11, asheet 10, and aback plate 4. For adjustment of the height h of the knife C, a region of theback portion 8′ where the height h of the knife C becomes greatest is yieldingly compressed with the thinferrous plate 11 under pressure during the test blanking operation (See Fig. 2). This allows the height h to become uniform automatically in adjustment. - Accordingly, when the adjustment of the height h of the knife C is carried out by the operator, it requires non of advanced technique and thus, will be accomplished with ease.
- In another embodiment shown in Fig. 3, a knife G is arranged in such a way that its
back portion 8′ is formed into a plurality oftongues 9 alternately flexed thicknesswisely thereof. - In a further embodiment shown in Fig. 4, a knife D has a bevelled surface so as to form a
blade edge 1′. - This invention may be practiced or embodiment in still other ways without departing from the spirit or essential character thereof. The preferred embodiments described therein are therefore illustrative and not restrictive, the scope of the invention being indicated by the appended claims and all variations which come within the meaning of the claims are intended to be embraced therein.
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP145590/87 | 1987-06-10 | ||
JP14559087A JPS63312099A (en) | 1987-06-10 | 1987-06-10 | Knife for punching sheet |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0297324A1 true EP0297324A1 (en) | 1989-01-04 |
EP0297324B1 EP0297324B1 (en) | 1990-10-03 |
Family
ID=15388603
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19880109208 Expired EP0297324B1 (en) | 1987-06-10 | 1988-06-09 | Knife for blanking in sheet |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0297324B1 (en) |
JP (1) | JPS63312099A (en) |
DE (1) | DE3860739D1 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3928916C1 (en) * | 1989-08-31 | 1991-01-24 | Karl Marbach Gmbh & Co, 7100 Heilbronn, De | |
EP0418768A2 (en) * | 1989-09-22 | 1991-03-27 | Electro Optic Ag | Stamping die and method of manufacture |
US5370028A (en) * | 1989-08-31 | 1994-12-06 | Karl Marbach Gmbh & Co. | Strip steel punching and indenting tool |
EP0655303A1 (en) * | 1993-11-26 | 1995-05-31 | Lande Wellpappen AG | Device for the steel rule die cutting of flat shapes |
WO1997027033A1 (en) * | 1996-01-26 | 1997-07-31 | Kimberly-Clark Worldwide, Inc. | A die cutting insert for a rotary die cutter and the die cutter itself |
US6055897A (en) * | 1996-06-21 | 2000-05-02 | Kimberly-Clark Worldwide, Inc. | Die cutting insert for a rotary die cutter and the die itself |
US6250189B1 (en) * | 1996-06-21 | 2001-06-26 | Kimberly-Clark Worldwide, Inc. | Rotary die cutter |
EP2159017A1 (en) * | 2008-08-28 | 2010-03-03 | Cartoproject S.r.l. | Flat cutting die and method for setting it up |
CN102248557A (en) * | 2011-04-06 | 2011-11-23 | 昆山市三和兴激光刀模有限公司 | Novel manufacturing process of cutting die |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05212699A (en) * | 1992-02-03 | 1993-08-24 | Nippon Daisuchiile Kk | Cutting die in use on carton die cutting device and manufacture thereof |
JPH05293797A (en) * | 1992-04-17 | 1993-11-09 | Rezatsuku:Kk | Processing method for knife |
JPH0650797U (en) * | 1992-11-30 | 1994-07-12 | 攘治 大塚 | Simple blade |
JP2002165948A (en) * | 2000-12-05 | 2002-06-11 | Heiwa Corp | Machining method for game board |
SE534677C2 (en) * | 2010-03-23 | 2011-11-15 | Sandvik Intellectual Property | Steel Town Knife |
JP7064729B1 (en) * | 2021-07-08 | 2022-05-11 | 株式会社ティーエスインダストリー | Punching blade for sheet-shaped workpieces |
Citations (2)
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 |
FR2512704A1 (en) * | 1981-09-11 | 1983-03-18 | Marbach Gmbh Karl | CUTTING TOOL WITH STEEL SHEET HAVING AT LEAST ONE CUTTING BLADE, STRIP-SHAPED, PROVIDED WITH A EDGE |
-
1987
- 1987-06-10 JP JP14559087A patent/JPS63312099A/en active Granted
-
1988
- 1988-06-09 EP EP19880109208 patent/EP0297324B1/en not_active Expired
- 1988-06-09 DE DE8888109208T patent/DE3860739D1/en not_active Expired - Lifetime
Patent Citations (2)
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 |
FR2512704A1 (en) * | 1981-09-11 | 1983-03-18 | Marbach Gmbh Karl | CUTTING TOOL WITH STEEL SHEET HAVING AT LEAST ONE CUTTING BLADE, STRIP-SHAPED, PROVIDED WITH A EDGE |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3928916C1 (en) * | 1989-08-31 | 1991-01-24 | Karl Marbach Gmbh & Co, 7100 Heilbronn, De | |
WO1991003358A1 (en) * | 1989-08-31 | 1991-03-21 | Karl Marbach Gmbh & Co. | Strip steel stamping and grooving tool and process for setting it |
US5370028A (en) * | 1989-08-31 | 1994-12-06 | Karl Marbach Gmbh & Co. | Strip steel punching and indenting tool |
EP0418768A2 (en) * | 1989-09-22 | 1991-03-27 | Electro Optic Ag | Stamping die and method of manufacture |
EP0418768A3 (en) * | 1989-09-22 | 1991-09-11 | Electro Optic Ag | Stamping die, method of manufacture and tool for use in carrying out said process |
CH680842A5 (en) * | 1989-09-22 | 1992-11-30 | Electro Optic Ag | |
EP0655303A1 (en) * | 1993-11-26 | 1995-05-31 | Lande Wellpappen AG | Device for the steel rule die cutting of flat shapes |
CH687448A5 (en) * | 1993-11-26 | 1996-12-13 | Lande Wellpappen Ag | Apparatus for the ribbon section of Flaechengebilden. |
WO1997027033A1 (en) * | 1996-01-26 | 1997-07-31 | Kimberly-Clark Worldwide, Inc. | A die cutting insert for a rotary die cutter and the die cutter itself |
US6055897A (en) * | 1996-06-21 | 2000-05-02 | Kimberly-Clark Worldwide, Inc. | Die cutting insert for a rotary die cutter and the die itself |
US6250189B1 (en) * | 1996-06-21 | 2001-06-26 | Kimberly-Clark Worldwide, Inc. | Rotary die cutter |
EP2159017A1 (en) * | 2008-08-28 | 2010-03-03 | Cartoproject S.r.l. | Flat cutting die and method for setting it up |
CN102248557A (en) * | 2011-04-06 | 2011-11-23 | 昆山市三和兴激光刀模有限公司 | Novel manufacturing process of cutting die |
Also Published As
Publication number | Publication date |
---|---|
DE3860739D1 (en) | 1990-11-08 |
EP0297324B1 (en) | 1990-10-03 |
JPH0558878B2 (en) | 1993-08-27 |
JPS63312099A (en) | 1988-12-20 |
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