EP0569880B1 - Upper tool holding device for press brake - Google Patents
Upper tool holding device for press brake Download PDFInfo
- Publication number
- EP0569880B1 EP0569880B1 EP93107463A EP93107463A EP0569880B1 EP 0569880 B1 EP0569880 B1 EP 0569880B1 EP 93107463 A EP93107463 A EP 93107463A EP 93107463 A EP93107463 A EP 93107463A EP 0569880 B1 EP0569880 B1 EP 0569880B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tool
- pressing
- fixing member
- holder body
- clamping force
- 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 - Lifetime
Links
Images
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
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
- B21D5/0209—Tools therefor
-
- 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
- B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
- B21D5/0209—Tools therefor
- B21D5/0236—Tool clamping
Definitions
- the present invention relates to an upper tool holding device for a press brake, according to the preamble of claim 1 and as disclosed in FR-A-2 609 909.
- a press brake is provided with an upper table (referred to as an upper apron, sometimes) and a lower table (referred to as a lower apron, sometimes) arranged in such a way as to be opposed to each other, and either of the upper or lower table is disposed movably in the vertical direction.
- an upper table referred to as an upper apron, sometimes
- a lower table referred to as a lower apron, sometimes
- an upper tool is mounted on the lower part of the upper table, and a lower tool is mounted on the upper part of the lower table. Therefore, when the movable side table is moved up and down so that the upper and lower tools can be engaged with each other, a workpiece positioned between the upper and lower tools is to be bent.
- a number of upper tool holders are mounted on the lower part of the upper table to exchange the upper tool with an appropriate one according to the bending shape of the workpiece.
- the upper tools are supported by a number of upper holders so as to be exchanged.
- the structure is such that an upper-tool pressing-down and fixing member is mounted on a holder body attached to the lower part of the upper table, and the upper-tool pressing-down and fixing member is fastened with fastening bolts to tightly fasten and fix the upper part of the upper tool between the holder body and the upper tool clamp.
- an upper tool holding device for a press brake by which an upper tool can be easily exchanged and which can prevent the upper tool from being dropped when the tool is mounted in the holder before being finally clamped or when the upper tool is released.
- the upper holding device related to the first embodiment includes a holder body 5 removably mounted on the lower part of an upper table 3 of a press brake (not shown); a support plate 7 formed integral with the lower part of the holder body 5; an upper-tool pressing-down and fixing member 11 for pressing-down and fixing an upper tool 9 between the upper-tool pressing-down and fixing member 11 and the support plate 7; a clamping-force producing device 13 for producing the clamping force of the upper-tool pressing-down and fixing member 11, and a clamp releasing device 15 for releasing the upper tool 9 from the upper-tool pressing-down and fixing member 11.
- the holder body 5 is formed with an upper block portion 5B having a thick wall in the front and rear direction (in the right and left direction in Fig. 2).
- the support plate 7 is formed integral with the lower part of the upper block portion 5B.
- a mounting plate 19 projecting upward is mounted with the use of a plurality of bolts 17 (see Fig. 1).
- the holder body 5 can be mounted on the upper table 3 by bringing the mounting plate 19 into contact with the front lower portion of the upper table 3 and by fastening a clamp jaw 23 with the use of fastening bolts 21 screwed into the upper table 3.
- a wedge member 25 is interposed between the upper surface of the holder body 5 and the upper table 3 to adjust the vertical position of the holder body 5.
- the upper-tool pressing-down and fixing member 11 is formed with a plate-shaped member having a width roughly the same as that of the holder body 5 in the right and left direction in Fig. 1, and pivotally supported by the holder body 5 so as to fix the upper tool 9 in cooperation with the support plate 7.
- the upper-tool pressing-down and fixing member 11 is formed with through holes 11H at roughly the middle portion (in the vertical direction) thereof (see Fig. 2), and pivotally supported by a plurality of mounting bolts 27 passed through the through holes 27H and screwed in the horizontal direction into the support plate 7.
- a spherical washer 29 is interposed between a head portion 27H of each of the mounting bolts 27 and the upper-tool pressing-down and fixing member 11.
- a weak coil spring 31 is elastically disposed between the upper-tool pressing-down and fixing member 11 and the support plate 7 so that the two members 11 and 7 are urged to be away form each other.
- two pressing-down and fixing sections 11C are projectingly formed to press the upper tool 9 against the support plate 7 for clamping the upper tool 9.
- a push member 33 for pressing the upper tool 9 is mounted on the pressing-down and fixing section 11C with a bolt 35.
- the clamp releasing device 15 is provided on the upper portion of the upper-tool pressing-down and fixing member 11 to release the upper tool 9 clamped by the pressing-down and fixing section 11C of the upper-tool pressing-down and fixing member 11.
- the clamp releasing device 15 includes a fastening screw 37 screwed into the upper portion of the upper-tool pressing-down and fixing member 11, and a lever 39 is attached to this fastening screw 37.
- the clamping-force producing device 13 includes an adjust screw 45 engaged with a nut member 43 for relative positional adjustment, a ring member 47 fitted to the adjust screw 45 so as to be movable in the axial direction, a strong elastic member 49 (a coil spring or a disk spring or urethane rubber) elastically interposed between the head portion 45H of the adjust screw 45 and the ring member 47, as shown in Fig. 2.
- the clamping-force producing device 13 is disposed in a horizontal inner hollow portion 5H formed in the upper block portion 5B of the holder body 5.
- a contact member 51 in contact with the front end portion of the fastening screw 37 is formed integral with the ring member 47.
- a head portion 45H of the adjust screw 45 is in contact with the side wall of the hollow portion 5H.
- a plurality of small piece members 53 are attached to the holder body 5 with bolts 55 so as to be brought into contact with the upper surface of the upper-tool pressing-down and fixing member 11, in order to guide the pivotal motion of the upper-tool pressing-down and fixing member 11 and further to restrict the upward movement of the upper-tool pressing-down and fixing member 11. Accordingly, the upper-tool pressing-down and fixing member 11 can press down and fix the upper tool 9 without moving in the vertical direction.
- the upper tool 9 exchangeably mounted on the upper holding device 1 as described above is formed with a wedge portion 9W having a contact surface 9F brought into contact with a lower end surface 7E of the support plate 7, a sliding surface 9S brought into slidable contact with a front surface 7F of the support plate 7, and a clamp surface 9C brought into tight contact with the push member 33 of the upper-tool pressing-down and fixing member 11.
- the wedge portion 9W is so formed as to provide a thin walled portion in the upward direction by forming the clamp surface 9C as an inclined surface. Further, the wedge portion 9W is formed with a projection portion 9P engageable with the pressing-down and fixing section 11C of the upper-tool pressing-down and fixing member 11.
- the upper tool 9 is formed with a lower end work processing portion 9M for bending a workpiece W in cooperation with a lower tool 59 mounted on a lower table 57 of the press brake.
- the upper tool 9 is mounted on the upper tool holding device 1 in accordance with the following procedure:
- the lever 39 of the clamp releasing device 15 is pivoted in the clockwise direction to hold the fastening screw 37 in the fastened condition. Even under the condition that the fastening screw 37 is fastened as described above, the push member 33 formed at the lower portion of the upper-tool pressing-down and fixing member 11 is kept away from the support plate 7.
- the movable side of the upper or lower table 3 or 57 is moved up and down to engage the upper tool 9 with the lower tool 59, with the result that the upper tool 9 is moved upward relative to the holder body 5.
- the upper tool 9 can be removed from the upper tool holding device 1 as follows:
- the lever 39 of the clamp releasing device 15 is pivoted in the counterclockwise direction to loosen the fastening force of the fastening screw 37, so that the upper tool 9 is released from the upper-tool pressing-down and fixing member 11.
- the projection 9P of the wedge portion 9W of the upper tool 9 is engaged with the clamp portion 11C of the upper-tool pressing-down and fixing member 11, so that it is possible to prevent the upper tool 9 from being dropped.
- FIG. 3 A second embodiment of the upper tool holding device 1 according to the present invention will be described hereinbelow with reference to Figs. 3 to 5.
- another upper tool 9 can be further clamped on the rear surface of the support plate 7.
- a point different from the first embodiment is that a rear-side upper-tool pressing-down and fixing member 61 is attached to the rear surface of the support plate 7 in order to clamp the other upper tool 9 on the rear surface of the support plate 7.
- a stud 63 formed with a semispherical head portion 63H is attached horizontally to the rear surface of the support plate 7 of the holder body 5 with the use of a mounting bolt 65.
- the rear-side upper-tool pressing-down and fixing member 61 is pivotally supported by this stud 63.
- the front side upper-tool pressing-down and fixing member 11 is formed with a tool hole 11T, and a locking pin 67 engaged with a groove 61G formed in the rear-side upper-tool pressing-down and fixing member 61 is attached to the head portion 63H of the stud 63. Accordingly, when the mounting bolt 65 is rotated, the stud 63 will not be rotated.
- the clamping-force producing device 13 In order to use the clamping-force producing device 13 in common for both the front-side upper-tool pressing-down and fixing member 11 and the rear-side upper-tool pressing-down and fixing member 61, the clamping-force producing device 13 is housed in the holder body 5, and a small diameter hole 69 is formed in the rear wall of an inner hollow portion 5H. Further, a contact member 71 mounted on the upper portion of the rear-side upper-tool pressing-down and fixing member 61 is passed through the small diameter hole 69 so as to be brought into contact with a head portion 45H of an adjust screw 45.
- a ring nut 73 is screwed into left side (in Fig. 5) of the inner hollow portion 5H in order to restrict the movement of the contact member 51 of the clamp adjusting device 13.
- front-side upper-tool pressing-down and fixing member 11 is kept under the condition that an appropriate member is sandwiched between the support plate 7 and the lower end of the front-side upper-tool pressing-down and fixing member 11 (to hold the front-side upper-tool pressing-down and fixing member 11 at a fixed condition relative to the support plate 7), it is possible to fasten and release the upper tool 9 by use of the rear-side upper-tool pressing-down and fixing member 61 by operating the lever 39.
- two upper tools 9 can be fixed (both sides of each upper tool 9 are reversed) to the front and rear side surfaces of the support plate 7 of the holder body 5 according to the bending shape of the workpiece W, and in addition it is possible to exchange the upper tools 9 easily in the same way as with the case of the first embodiment.
- an upper tool or upper tools 9 can be exchanged easily in spite of the simple structure, and in addition it is possible to prevent the upper tool 9 from being dropped even when the upper tool holding device 1 is released from the fixed upper tool 9, thus improving the safety of the press brake.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
Description
Claims (5)
- An upper tool holding device (1) for a press brake, for removably mounting an upper tool (9) on an upper table (3) of the press brake, comprising:a holder body (5) attached to the upper table (3);a support plate (7) provided on a lower portion of said holder body (5);an upper-tool pressing-down and fixing member (11) attached to said holder body (5), for fixedly pressing-down an upper portion of an upper tool (9) in cooperation with said support plate (7);a clamping-force producing device (13) to urge said upper-tool pressing-down and fixing member (11); anda clamp releasing device (15) for releasing the pressing-down of the upper tool (9), said clamp releasing device (15) being provided on an upper portion of said upper-tool pressing-down and fixing member (11),
characterized in thatsaid clamping force prodicing device (13) comprises an elastic member (49) which generates a clamping force, the elastic member (49) being adjustable to change its elastic force and thereby the clamping force of said upper-tool pressing-down and fixing member (11),said elastic member (49) cooperates with said clamp releasing device (15), andthe clamp releasing device (15) is adapted to be moved between a fastened condition whereat the elastic member (49) is at least partly compressed and whereat a tool (9) can be chucked or held, and a release condition whereat the tool can be removed. - Upper tool holding device (1) for a press brake of claim 1, wherein said upper-tool pressing-down and fixing member (11) is pivotally supported by said holder body (5), the upper portion of said upper-tool pressing-down and fixing member (11) is urged by said clamping force producing device (13), in such a direction as to be separated from said holder body (5), to urge a pressing-down and fixing section (11c) provided on a lower portion of said upper-tool pressing-down and fixing member (11) toward said support plate (7), said clamp releasing device (15) includes a fastening screw (37) pivoted by a lever (39), and an end of the fastening screw (37) is brought into contact with said clamping force producing device (13).
- Upper tool holding device (1) for a press brake of claim 1 or 2, wherein said clamping force producing device (13) comprises an adjust screw (45) engaged with a nut member (43) to adjust an engage position between the two, a ring member (47) fitted to said adjust screw (45) so as to be axially shiftable, and the elastic member (49) being disposed between a head portion (45H) of said adjust screw (45) and said ring member (47).
- Upper tool holding device (1) of claim 1 or 2, wherein two upper-tool pressing-down and fixing members (11) are pivotally supported on both side surfaces of the holder body (5), and said clamping force producing device (13) is used in common for both said upper-tool pressing-down and fixing members (11).
- Upper tool holding device (1) according to one of claims 1 to 4, characterized in that said clamping force producing device (13) is disposed in a horizontal inner hollow portion (5H) formed in an upper block portion (5B) of the holder body (5).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP94118710A EP0644002B1 (en) | 1992-05-15 | 1993-05-07 | Upper tool for press brake |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP123183/92 | 1992-05-15 | ||
JP12318392 | 1992-05-15 | ||
JP133511/92 | 1992-05-26 | ||
JP4133511A JP2500247B2 (en) | 1992-05-26 | 1992-05-26 | Upper mold for press brake |
JP331318/92 | 1992-12-11 | ||
JP4331318A JPH0813379B2 (en) | 1992-05-15 | 1992-12-11 | Mold holder for press brake |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94118710.6 Division-Into | 1993-05-07 | ||
EP94118710A Division EP0644002B1 (en) | 1992-05-15 | 1993-05-07 | Upper tool for press brake |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0569880A2 EP0569880A2 (en) | 1993-11-18 |
EP0569880A3 EP0569880A3 (en) | 1994-01-12 |
EP0569880B1 true EP0569880B1 (en) | 1998-01-14 |
Family
ID=27314657
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93107463A Expired - Lifetime EP0569880B1 (en) | 1992-05-15 | 1993-05-07 | Upper tool holding device for press brake |
EP94118710A Expired - Lifetime EP0644002B1 (en) | 1992-05-15 | 1993-05-07 | Upper tool for press brake |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94118710A Expired - Lifetime EP0644002B1 (en) | 1992-05-15 | 1993-05-07 | Upper tool for press brake |
Country Status (2)
Country | Link |
---|---|
EP (2) | EP0569880B1 (en) |
DE (2) | DE69316263T2 (en) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5513514A (en) * | 1994-05-06 | 1996-05-07 | Amada Metrecs Company, Limited | Upper tool and upper tool holding device for press brake |
US5619885A (en) * | 1992-05-15 | 1997-04-15 | Amada Metrecs Company, Limited | Upper tool holder apparatus for press brake and method of holding the upper tool |
US5507170A (en) * | 1993-05-18 | 1996-04-16 | Amada Metrecs Company, Limited | Upper tool for press brake |
JP3004597U (en) * | 1993-05-18 | 1994-11-22 | 株式会社アマダメトレックス | Upper mold for press brake |
TW249765B (en) * | 1993-05-18 | 1995-06-21 | Amatamedory Kk | |
US5685191A (en) * | 1994-05-06 | 1997-11-11 | Amada Metrecs Company, Limited | Upper tool for press brake |
TW365857U (en) * | 1994-05-17 | 1999-08-01 | Amada Metrecs Co | Upper tool and upper tool holder apparatus for press brake |
JP2921741B2 (en) * | 1995-10-02 | 1999-07-19 | 株式会社アマダメトレックス | Upper die holder device for press brake |
NL1004266C1 (en) * | 1996-10-14 | 1998-04-15 | Cornelis Hendricus Liet | Toolholder for multi=part clamps for setting or folding benches |
US6003360A (en) * | 1997-07-01 | 1999-12-21 | Wilson Tool International, Inc. | Press brake tool holder |
US6450004B1 (en) | 2001-10-09 | 2002-09-17 | Douglas E. Edmondson | Press brake punch holder |
US7296457B2 (en) | 2004-06-25 | 2007-11-20 | Wilson Tool International Inc. | Thermally-actuated press brake tool holder technology |
US7721586B2 (en) | 2005-02-08 | 2010-05-25 | Wilson Tool International Inc. | Press brake tool seating technology |
US7308817B2 (en) | 2005-02-08 | 2007-12-18 | Wilson Tool International Inc. | Push plate tool holder for press brakes |
US7596983B2 (en) | 2005-07-11 | 2009-10-06 | Wilson Tool International Inc. | Press brake clamp incorporating tool-seating mechanism |
CN101417303B (en) * | 2008-12-01 | 2010-11-10 | 米路加(深圳)科技发展有限公司 | Die clamp |
CN108067543B (en) * | 2017-11-23 | 2019-08-20 | 马鞍山市国菱机械刃模有限公司 | A kind of fixed device of the upper mold of good clamping effect |
WO2020142027A1 (en) * | 2018-12-31 | 2020-07-09 | Durmazlar Makina Sanayi Ve Ticaret Anonim Sirketi | An auxiliary bending tool for bending machines |
CN115213263B (en) * | 2022-09-20 | 2022-12-13 | 烟台精锐模具有限公司 | Fine-adjustable stamping machine for inner elastic sheet of printer |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3136440A1 (en) * | 1981-09-14 | 1983-03-31 | Paul Weinbrenner Maschinenbau GmbH + Co KG, 7252 Weil der Stadt | Clamping device for clamping tools |
FR2609909A1 (en) * | 1987-01-28 | 1988-07-29 | Norlander Goran | Tool-gripping device for a bending press |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE749638C (en) * | 1939-09-22 | 1944-11-28 | Cutting and bending tool with column guide frame and exchangeable cutting and bending elements | |
JPH0716713B2 (en) * | 1986-05-14 | 1995-03-01 | 株式会社アマダ | Mold clamping device for bending machine |
FR2598946A1 (en) * | 1986-05-20 | 1987-11-27 | Promecan Sisson Lehmann | Device for fixing a punch or a die onto a table (deck, apron) of a bending press |
FR2643838B1 (en) * | 1989-03-02 | 1991-05-31 | Treillet Jean | RIGID FIXING DEVICE FOR HANGING PARTS SUCH AS BENDING PRESS PUNCHES |
-
1993
- 1993-05-07 DE DE1993616263 patent/DE69316263T2/en not_active Expired - Fee Related
- 1993-05-07 EP EP93107463A patent/EP0569880B1/en not_active Expired - Lifetime
- 1993-05-07 EP EP94118710A patent/EP0644002B1/en not_active Expired - Lifetime
- 1993-05-07 DE DE1993623876 patent/DE69323876T2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3136440A1 (en) * | 1981-09-14 | 1983-03-31 | Paul Weinbrenner Maschinenbau GmbH + Co KG, 7252 Weil der Stadt | Clamping device for clamping tools |
FR2609909A1 (en) * | 1987-01-28 | 1988-07-29 | Norlander Goran | Tool-gripping device for a bending press |
Also Published As
Publication number | Publication date |
---|---|
EP0644002B1 (en) | 1999-03-10 |
EP0644002A2 (en) | 1995-03-22 |
EP0569880A3 (en) | 1994-01-12 |
DE69316263T2 (en) | 1998-04-30 |
EP0644002A3 (en) | 1995-10-18 |
DE69316263D1 (en) | 1998-02-19 |
DE69323876T2 (en) | 1999-07-01 |
EP0569880A2 (en) | 1993-11-18 |
DE69323876D1 (en) | 1999-04-15 |
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