JPS63309328A - Method for bending band blade - Google Patents
Method for bending band bladeInfo
- Publication number
- JPS63309328A JPS63309328A JP62145668A JP14566887A JPS63309328A JP S63309328 A JPS63309328 A JP S63309328A JP 62145668 A JP62145668 A JP 62145668A JP 14566887 A JP14566887 A JP 14566887A JP S63309328 A JPS63309328 A JP S63309328A
- Authority
- JP
- Japan
- Prior art keywords
- band blade
- feeding
- bending
- presser
- band
- 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
- 238000005452 bending Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims description 18
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000003825 pressing Methods 0.000 claims abstract description 5
- 230000001154 acute effect Effects 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 description 11
- 239000000758 substrate Substances 0.000 description 4
- 101100008047 Caenorhabditis elegans cut-3 gene Proteins 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/20—Making tools by operations not covered by a single other subclass
- B21D37/205—Making cutting tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/04—Bending sheet metal along straight lines, e.g. to form simple curves on brakes making use of clamping means on one side of the work
- B21D5/045—With a wiping movement of the bending blade
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/60—Making other particular articles cutlery wares; garden tools or the like
- B21D53/64—Making other particular articles cutlery wares; garden tools or the like knives; scissors; cutting blades
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、所謂トムソン刃木型等に用いられる帯刃を
所望の曲率半径となるように曲げ加工する方法に関する
。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of bending a band blade used in a so-called Thomson blade mold or the like to a desired radius of curvature.
木、紙、布、皮革、プラスチック等の板材を所定の形状
に打ち抜いたりそれ′らの板材に所定の形状の切り目を
形成したりするときに使用されるトムソン刃木型は、第
３図から類推できるように所定形状に曲げ加工された帯
刃１を基板２に形成されたスリット状の切り口３に押し
込んで基板２に埋め込むことにより製作され、完成品で
は、帯刃１の刃先４が基板２がら突出した構成になって
いる。同図のトムソン刃木型は上記板材に所定の形状の
切り目を形成するためものであり、そのために帯刃１は
複数個所で分割され、その分割個所には小幅の隙間５が
形成されている。さらに、切り目３は帯刃１の形状と同
一の形状の輪郭線に沿って断続的に複数形成されており
、切り目３が形成されていない切り目なし部分６には上
記隙間５又は帯刃１に形成された凹所７が対応する。ま
た、基板２には必要に応じて折り目形成用の押し刃８が
埋め込まれる。The Thomson blade die, which is used to punch out wood, paper, cloth, leather, plastic, etc., into a predetermined shape, or to make cuts in a predetermined shape in such a board, is shown in Figure 3. By analogy, it is manufactured by pushing the band blade 1 bent into a predetermined shape into a slit-shaped cut 3 formed in the substrate 2 and embedding it in the substrate 2, and in the finished product, the cutting edge 4 of the band blade 1 is attached to the substrate 2. It has a structure that stands out from the rest. The Thomson knife die shown in the figure is used to form cuts of a predetermined shape in the above-mentioned plate material, and for this purpose, the band blade 1 is divided into multiple parts, and small gaps 5 are formed at the divided parts. . Furthermore, a plurality of cuts 3 are formed intermittently along the contour line of the same shape as the band blade 1, and in the uncut portion 6 where the cuts 3 are not formed, there are gaps 5 or the band blade 1. The formed recess 7 corresponds. Further, a push blade 8 for forming creases is embedded in the substrate 2 as necessary.
このようなトムソン刃木型を製作する場合、複数の切り
目３により形成される輪郭線の形状と帯刃１の形状は正
確又はほぼ正確に同一でなければならず、それらの形状
の差異が大き過ぎると切り目３へ帯刃ｌを埋め込むこと
ができない。従って、帯刃１に湾曲した部分を具備させ
ることが要求されるときにはその湾曲部分の曲率半径が
切り目３の湾曲部分のそれと正確又はほぼ正確に同一に
なるように曲げ加工する必要がある。When manufacturing such a Thomson knife mold, the shape of the contour line formed by the plurality of cuts 3 and the shape of the band blade 1 must be exactly or almost exactly the same, and the difference in shape between them must be large. If it is too long, it will not be possible to embed the band blade l into the cut 3. Therefore, when the band blade 1 is required to have a curved portion, it is necessary to perform the bending process so that the radius of curvature of the curved portion is exactly or almost exactly the same as that of the curved portion of the cut 3.
従来、帯刃１を曲げ加工して湾曲部分を形成する場合に
は、第４図のように下型１ｏに形成した溝形凹所１１の
上に仮想線で示すように曲げ加工前の帯刃１を置き、上
型１２でその帯刃１を加減しながら叩いて凹所１１内へ
凹ませると共に、同様の成形作業を帯刃の所定幅内の複
数個所に施していた。Conventionally, when bending the band blade 1 to form a curved part, the band before bending is placed above the groove-shaped recess 11 formed in the lower mold 1o as shown by the imaginary line as shown in FIG. A blade 1 is placed, and the band blade 1 is hit with an upper die 12 while adjusting it to dent it into the recess 11, and a similar molding operation is performed at a plurality of locations within a predetermined width of the band blade.
しかしながら、上述した従来の方法は、帯刃を叩いて凹
ませるときの力加減が難しく、このことが帯刃にスプリ
ングバンクが具備されていることとも相まって、所望の
曲率半径を有する湾曲部分を正確に形成するのに高度な
技量と熟練を必要とし、誰でもが簡単に行うことができ
ないという問題があった。However, with the above-mentioned conventional method, it is difficult to adjust the force when striking the band blade to make it concave. This, combined with the fact that the band blade is equipped with a spring bank, makes it difficult to accurately form a curved portion with a desired radius of curvature. There was a problem in that it required a high degree of skill and skill to form, and that it could not be easily done by anyone.
この発明は以上の問題を解決するもので、特別の訓練な
く、初心者でも簡単かつ迅速に帯刃を所定の形状に曲げ
加工することが可能な方法を提供することを目的とする
。This invention solves the above problems, and aims to provide a method that allows even beginners to easily and quickly bend a band blade into a predetermined shape without special training.
上記目的を達成するために講じられた手段は、型材の出
口から帯刃を間欠的に送り出しつつ、帯刃の送りが停止
されているときに、押し具を一定幅だけ移動させること
により上記帯刃を上記出口に具備された型材の成形面に
押し付けて一定角度だけ折り曲げることである。The means taken to achieve the above purpose is to intermittently feed the band blade from the outlet of the profile material, and when the feeding of the band blade is stopped, move the pushing tool by a certain width, thereby making the band The blade is pressed against the molding surface of the mold material provided at the outlet and bent by a certain angle.
以上の構成によると、型材の出口から帯刃を間欠的に送
り出すことにより、帯刃の所定間隔おきの個所が次々と
上記出口に具備された型材の成形面に対向される。また
、帯刃の送りが停止されているときに、押し具を一定幅
だけ移動させることにより上記帯刃を上記成形面に押し
付けて一定角度だけ折り曲げると、上述のように次々と
成形面に対向された帯刃の複数個所の曲がり角度がすべ
て同一になる。従って、帯刃の一回の折曲げ角度と折曲
げ回数を制御することにより所望の曲率半径を有する湾
曲部分が正確に形成される。例えば帯刃の間欠送り幅を
一定にしておけば、折曲げ角度を制御するだけで所望の
曲率半径を有する円弧状の湾曲部分が正確に形成される
。According to the above configuration, by intermittently sending out the band blades from the outlet of the mold material, parts of the band blades at predetermined intervals are successively opposed to the molding surface of the mold material provided at the outlet. Furthermore, when the feeding of the band blades is stopped, if the pushing tool is moved by a certain width to press the band blades against the molding surface and bend them by a certain angle, the band blades will face the molding surface one after another as described above. The bending angles at multiple locations on the band blade are all the same. Therefore, by controlling the bending angle of the band blade and the number of bends, a curved portion having a desired radius of curvature can be accurately formed. For example, if the intermittent feed width of the band blade is kept constant, an arcuate curved portion with a desired radius of curvature can be accurately formed simply by controlling the bending angle.
第１ａ〜ｌｄ図はこの発明の曲げ加工を行う手順を示し
ている。同図において、２０は型材で、その出口のコー
ナ部分に鋭角状に尖った成形面２１が具備されている。Figures 1a to 1d show the procedure for performing the bending process of the present invention. In the figure, 20 is a molded material, and an acutely pointed molding surface 21 is provided at the exit corner portion of the molded material.
２２は押し具で、上記成形面２１に対し第１ａ図に例示
した円弧経路Ａ−Ａに沿って接近離反可能に構成されて
いる。２３は帯刃１に送りをかける送りローラである。Reference numeral 22 denotes a pusher, which is configured to be able to approach and leave the molding surface 21 along the circular arc path A-A illustrated in FIG. 1a. 23 is a feed roller that feeds the band blade 1.
以上において、例えば第１ａ図のように送りローラ２３
を所定角度だけ回転させて型材２０の出口から帯刃１を
送り出し、帯刃１の所定個所イが上記成形面２１に対向
したところで帯刃１の送りを停止し、続いて押し具２２
を第１ｂ図のように右方向へ移動させることにより帯刃
１を成形面２１に押し付けて上記個所イを一定角度だけ
折り曲げる。In the above, for example, as shown in FIG. 1a, the feed roller 23
is rotated by a predetermined angle to send out the band blade 1 from the exit of the mold material 20, and when the specified point A of the band blade 1 faces the forming surface 21, feeding of the band blade 1 is stopped, and then the push tool 22
By moving the band blade 1 to the right as shown in FIG. 1b, the band blade 1 is pressed against the molding surface 21 and the above-mentioned portion A is bent by a certain angle.
この後、第１Ｃ図のように押し具２２を元の位置まで後
退させると共に、送りローラ２３を所定角度だけ回転さ
せて帯刃１を送り出し、既に折り曲げられている個所イ
から所定幅だけ離れた個所口を上記成形面２１に対向さ
せて送りを停止する。そして、再び押し具２２を右方向
へ移動させることにより帯刃ｌを成形面２１に押し付け
て一体角度だけ折り曲げる。以上の操作を繰り返すと、
帯刃ｌが所定間隔おきの複数個所で折り曲げられ、全体
として湾曲形状に曲げ加工される。After that, as shown in Fig. 1C, the pushing tool 22 is retreated to its original position, and the feed roller 23 is rotated by a predetermined angle to send out the band blade 1, leaving it a predetermined width away from the already bent part A. Feeding is stopped with the point opening facing the molding surface 21. Then, by moving the pusher 22 to the right again, the band blade 1 is pressed against the molding surface 21 and bent by an integral angle. If you repeat the above operations,
The band blade l is bent at a plurality of locations at predetermined intervals, and the entire band is bent into a curved shape.
上述の方法において、押し具２２の移動幅Ｈを一定にし
ておけば、帯刃の各個所（４１口・・・）の−回の折曲
げ角度は同一になる。また、送りローラ２３による帯刃
ｌの間欠送り幅りを一定にしておけば、折り曲げられる
各個所（４１口・・・）の相互間隔は同一になる。この
ことより、円弧状の湾曲部分を曲げ加工する場合には、
例えば帯刃１の曲げ加工を施す部分を等分割した個所が
上記成形面２１に次々と対向されるように帯刃の間欠送
り幅りを決めると共に、押し具２２の一回の押し付けに
より折り曲げられる帯刃ｌの折曲げ角度と曲げ加工によ
り形成したい湾曲部分の曲率半径とから折曲げ回数を算
出しておけば、これら両方の要素を因子として正確な曲
げ加工を行うことが可能になる。なお、押し具２２の一
回の押し付けにより折り曲げられる帯刃ｌの曲がり角度
には、帯刃１のスプリングバンクを考慮しておく必要が
ある。In the above method, if the moving width H of the push tool 22 is kept constant, the -times bending angles of each location (41 openings, etc.) of the band blade will be the same. Furthermore, if the width of the intermittent feed of the band blade l by the feed roller 23 is kept constant, the mutual spacing between the bent portions (41 openings, etc.) will be the same. From this, when bending an arcuate curved part,
For example, the intermittent feeding width of the band blade is determined so that the parts of the band blade 1 to be bent are equally divided so that they face the forming surface 21 one after another, and the band blade 1 is bent by pressing once with the push tool 22. If the number of bends is calculated from the bending angle of the band blade l and the radius of curvature of the curved portion to be formed by bending, it becomes possible to perform accurate bending using both of these factors as factors. Note that the spring bank of the band blade 1 must be taken into consideration when determining the bending angle of the band blade 1 that is bent by one pressing of the push tool 22.
また、帯刃１を直角に曲げ加工するときは、押し具２２
の移動幅Ｈを大きくすることが必要で、そのような直角
の曲げ加工を行うに際しては、上記成形面２１が直角よ
り小さい鋭角状に尖っており、しかも押し軸２２が上記
円弧経路Ａ−Ａに沿って移動するように構成されている
ことが役立つ。即ち、帯刃１を折り曲げたときにはその
帯刃１がスプリングバックによって折り曲げ後にや＼復
元するから、押し具２２が上記成形面２１の下を通過し
た後にさらにや＼上向きに移動して帯刃１を押し具２２
によって直角より小さい鋭角に折り曲げておけば、押し
具２２が後退した後には帯刃１がスプリングバックによ
って直角に復元するからである。In addition, when bending the band blade 1 at right angles, the pusher 22
It is necessary to increase the movement width H of the curve, and when performing such a right-angled bending process, the forming surface 21 has an acute angle that is smaller than a right angle, and the push shaft 22 has to move along the arcuate path A-A. It helps to be configured to move along. That is, when the band blade 1 is bent, the band blade 1 returns to its original state slightly after bending due to springback, so after the pushing tool 22 passes under the forming surface 21, it moves slightly upward and the band blade 1 is bent. Push tool 22
This is because if the band blade 1 is bent at an acute angle smaller than a right angle, the band blade 1 will return to the right angle due to springback after the push tool 22 retreats.
第２図は上述した手順で曲げ加工された帯刃ｌの湾曲部
分を示している。同図において、Ａは曲げ加工により形
成された円弧状の湾曲部分の両端部の開き角度、ａは押
し具２２の押し付けにより折り曲げられた個所相互の開
き角度で、これは上記開き角度Ａを等分割したときの一
つ分の角度である。また、ｒは湾曲部分の曲率半径であ
る。FIG. 2 shows the curved portion of the band blade l that has been bent in the above-described procedure. In the figure, A is the opening angle of both ends of the arc-shaped curved portion formed by bending, and a is the opening angle between the parts bent by pressing with the pusher 22, which is equal to the opening angle A. This is the angle of one part when divided. Further, r is the radius of curvature of the curved portion.
以上の説明のように、この発明の曲げ加工方法によると
、帯刃をどのような曲率半径を有する湾曲形状にでも簡
単かつ正確に折り曲げることができるようになり、しか
もその曲げ加工を熟練者に限らず特別な訓練を受けてい
ない初心者でも簡単に行えるようになる。また、曲げ加
工をコンピュータで制御しながら行えるので、従来では
極めて困難を伴うような複雑な形状の曲げ加工をも行え
るようになる利点がある。As explained above, according to the bending method of the present invention, it becomes possible to easily and accurately bend the band blade into a curved shape having any radius of curvature, and the bending process can be performed by an expert. It can be easily performed even by beginners who have not received any special training. Furthermore, since the bending process can be performed while being controlled by a computer, there is an advantage that it is possible to perform bending processes of complicated shapes, which would have been extremely difficult in the past.
第１ａ〜ｌｄ図はこの発明の実施例による曲げ加工方法
の手順を示す説明図、第２図は第１ａ〜ｌｄ図の手順に
従って曲げ加工された帯刃の湾曲部分を示す側面図、第
３図はトムソン刃木型の分解斜視図、第４図は従来の曲
げ加工方法を示す説明図である。
１・・・帯刃、２０・・・型材、２１・・・成形面、２
２・・・押し具、Ｈ・・・押し具の移動幅。Figures 1a to 1d are explanatory views showing the procedure of the bending method according to the embodiment of the present invention, Figure 2 is a side view showing the curved portion of the band blade that has been bent according to the procedure of Figures 1a to 1d, and Figure 3 The figure is an exploded perspective view of a Thomson knife die, and FIG. 4 is an explanatory diagram showing a conventional bending method. DESCRIPTION OF SYMBOLS 1... Band blade, 20... Shape material, 21... Molding surface, 2
2...Press tool, H...Movement width of the push tool.
Claims (1)
刃の送りが停止されているときに、押し具を一定幅だけ
移動させることにより上記帯刃を上記出口に具備された
型材の成形面に押し付けて一定角度だけ折り曲げること
を特徴とする帯刃の曲げ加工方法。(1) While feeding the band blade intermittently from the outlet of the shape material, when the feeding of the band blade is stopped, the pushing tool is moved by a certain width to move the band blade to the shape material provided at the outlet. A method of bending a band blade, which is characterized by pressing it against a forming surface and bending it at a certain angle.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62145668A JPH0661583B2 (en) | 1987-06-10 | 1987-06-10 | Bending method of band blade |
| PCT/JP1988/000472 WO1988009703A1 (en) | 1987-06-10 | 1988-05-18 | Method of bending band knife |
| EP19880904610 EP0317637A4 (en) | 1987-06-10 | 1988-05-18 | Method of bending band knife. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62145668A JPH0661583B2 (en) | 1987-06-10 | 1987-06-10 | Bending method of band blade |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63309328A true JPS63309328A (en) | 1988-12-16 |
| JPH0661583B2 JPH0661583B2 (en) | 1994-08-17 |
Family
ID=15390322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62145668A Expired - Lifetime JPH0661583B2 (en) | 1987-06-10 | 1987-06-10 | Bending method of band blade |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0317637A4 (en) |
| JP (1) | JPH0661583B2 (en) |
| WO (1) | WO1988009703A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06238338A (en) * | 1993-02-15 | 1994-08-30 | Itami Kogyo Kk | Device for bending knife |
| WO1995000266A1 (en) * | 1993-06-17 | 1995-01-05 | Suehiro Mizukawa | Band plate bending apparatus |
| US5463890A (en) * | 1992-05-29 | 1995-11-07 | Kabushiki Kaisha Tachibana Seisakusho | Automatic bending apparatus and marking device for band-shaped work |
| US5481896A (en) * | 1992-06-11 | 1996-01-09 | Itami Industrial Co., Ltd. | Knife bending apparatus |
| DE19624830A1 (en) * | 1995-06-22 | 1997-01-02 | Byung Jun Song | Cutting blade folding system for flat material blank |
| JP2004090039A (en) * | 2002-08-30 | 2004-03-25 | Komatsu Ltd | Method for bending tubular material having special-shaped cross section for cab frame |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR9103814A (en) * | 1991-08-30 | 1993-03-30 | Brasil Compressores Sa | PLASTICALLY DEFORMABLE BODY BENDING PROCESS |
| JPH0790274B2 (en) * | 1992-05-29 | 1995-10-04 | 株式会社橘製作所 | Bending device |
| JPH0790276B2 (en) * | 1993-05-24 | 1995-10-04 | サンテクス株式会社 | Bending method |
| JP3349834B2 (en) * | 1994-08-20 | 2002-11-25 | 株式会社菱屋 | Blade material bending machine |
| US20050005664A1 (en) | 2003-07-09 | 2005-01-13 | Wesley Scott | System and method for bending strip material to create cutting dies |
| AT501151B8 (en) * | 2004-11-24 | 2007-02-15 | Univ Fuer Angewandte Kunst Wie | METHOD FOR CONTROLLING BENDING MACHINES |
| CN103048948B (en) * | 2012-12-25 | 2015-03-25 | 南通恒康数控机械有限公司 | Calculation method of automatic twisting points of ring cutter numerical control software |
| CN104889202B (en) * | 2015-06-10 | 2017-09-12 | 昌利数控设备（深圳）有限公司 | Knives bending machine wide-angle bent blade device and knives bending machine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5159062A (en) * | 1974-11-15 | 1976-05-22 | Fabro Remigio Del |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2119299A (en) * | 1982-03-04 | 1983-11-16 | Pa Management Consult | Making cutting tools |
| GB8303954D0 (en) * | 1983-02-12 | 1983-03-16 | Pa Management Consult | Bending metal strip |
-
1987
- 1987-06-10 JP JP62145668A patent/JPH0661583B2/en not_active Expired - Lifetime
-
1988
- 1988-05-18 EP EP19880904610 patent/EP0317637A4/en not_active Withdrawn
- 1988-05-18 WO PCT/JP1988/000472 patent/WO1988009703A1/en not_active Application Discontinuation
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5159062A (en) * | 1974-11-15 | 1976-05-22 | Fabro Remigio Del |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5463890A (en) * | 1992-05-29 | 1995-11-07 | Kabushiki Kaisha Tachibana Seisakusho | Automatic bending apparatus and marking device for band-shaped work |
| US5481896A (en) * | 1992-06-11 | 1996-01-09 | Itami Industrial Co., Ltd. | Knife bending apparatus |
| JPH06238338A (en) * | 1993-02-15 | 1994-08-30 | Itami Kogyo Kk | Device for bending knife |
| WO1995000266A1 (en) * | 1993-06-17 | 1995-01-05 | Suehiro Mizukawa | Band plate bending apparatus |
| US5507168A (en) * | 1993-06-17 | 1996-04-16 | Mizukawa; Suehiro | Apparatus for bending a strip material |
| DE19624830A1 (en) * | 1995-06-22 | 1997-01-02 | Byung Jun Song | Cutting blade folding system for flat material blank |
| US6128940A (en) * | 1995-06-22 | 2000-10-10 | Sds Usa, Inc. | Folding system for a cutting blade |
| DE19624830C2 (en) * | 1995-06-22 | 2001-09-06 | Song Byung Jun | Device and method for bending a metal cutting blade |
| JP2004090039A (en) * | 2002-08-30 | 2004-03-25 | Komatsu Ltd | Method for bending tubular material having special-shaped cross section for cab frame |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0317637A4 (en) | 1989-10-17 |
| WO1988009703A1 (en) | 1988-12-15 |
| EP0317637A1 (en) | 1989-05-31 |
| JPH0661583B2 (en) | 1994-08-17 |
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