EP2915604B1 - Back gauge apparatus - Google Patents

Back gauge apparatus Download PDF

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Publication number
EP2915604B1
EP2915604B1 EP15157268.2A EP15157268A EP2915604B1 EP 2915604 B1 EP2915604 B1 EP 2915604B1 EP 15157268 A EP15157268 A EP 15157268A EP 2915604 B1 EP2915604 B1 EP 2915604B1
Authority
EP
European Patent Office
Prior art keywords
contact member
work contact
slide body
work
back gauge
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.)
Active
Application number
EP15157268.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2915604A1 (en
Inventor
Makoto Aoki
Shogo Akiyama
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.)
Amada Co Ltd
Original Assignee
Amada 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
Application filed by Amada Co Ltd filed Critical Amada Co Ltd
Publication of EP2915604A1 publication Critical patent/EP2915604A1/en
Application granted granted Critical
Publication of EP2915604B1 publication Critical patent/EP2915604B1/en
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Anticipated expiration legal-status Critical

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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
    • B21D5/002—Positioning devices
    • 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

Definitions

  • the present invention relates to a back gauge apparatus installed in a press brake, and particularly, to a back gauge apparatus capable of detecting contact with an obstacle while being moved and positioned in a front-rear direction.
  • a back gauge apparatus installed in the press brake is moved and positioned in a front-rear direction, and then, a rear end of the work is brought into contact with a work contact member of the back gauge apparatus so as to position the work. Once the work is correctly positioned, the press brake bends the work with upper and lower tools attached to the press brake.
  • the back gauge apparatus When moved and positioned in the front-rear direction, the back gauge apparatus may sometimes hit a work to be positioned. When the back gauge apparatus is moved close to the lower tool, the back gauge apparatus may raise a risk of biting the hand of a worker between the back gauge apparatus and the lower tool.
  • Related arts concerning the back gauge apparatus include Japanese Unexamined Patent Application Publication No. H09-253753 (Patent Literature 1) .
  • Patent Literature 1 temporarily stops the back gauge apparatus or moves the same very slowly when the back gauge apparatus reaches a predetermined distance from the lower tool during the positioning of the back gauge apparatus in the front-rear direction. Thereafter, the related art resumes the positioning of the back gauge apparatus in the front-rear direction. This technique deteriorates productivity, and therefore, an improvement is needed.
  • Document WO 03/095125 A2 discloses a back gauge apparatus comprising a carrier and a work contact member supported by the carrier.
  • the work contact member is biased with a pushing force by means of a spring.
  • the carrier is provided with a stopper so that the work contact member may be fixed to the carrier.
  • a detecting means is provided for detecting the distance to a pin connected to the work contact member.
  • a back gauge apparatus comprising a work contact member biased by a pushing force of a spring.
  • a detector is provided for detecting the position of the work contact member.
  • Document US 5 526 672 A discloses a back gauge apparatus comprising an arm supporting a gauge bar and a gauge block mounted to said gauge bar.
  • a gauge finger assembly is connected with the gauge block.
  • the gauge finger assembly comprises a finger base and a movable finger pivotably connected to said finger base by means of a mounting member.
  • the finger base includes a projecting member biased by the force of a spring and engaging a recess of the movable finger.
  • the back gauge apparatus for a press brake includes a slide body and a work contact member that is arranged on the slide body so as to be movable in a front-rear direction, wherein the work contact member has a work contact face, and is pushed frontward with a pushing force.
  • the slide body is provided with a fixing unit that is able to fix the work contact member to the slide body and release the fixation of the work contact member when the work contact member is pressed rearward with a pressing force greater than the pushing force.
  • the fixing unit has a rotary lever that is rotatably arranged on the slide body; a first end of the rotary lever is provided with a magnet that magnetically fixes the rotary lever to the slide body or the first end of the rotary lever is provided with a sucking unit that fixes the rotary lever to the slide body by suction; and the work contact member is provided with a pressing member to press a second end of the rotary lever to release the magnetic fixation by the magnet or to release the sucking fixation by the sucking unit.
  • the slide body is provided with a detector that detects when the work contact member is moved rearward against the pushing force.
  • a back gauge apparatus according to an embodiment of the present invention will be explained with reference to the drawings.
  • a press brake with a back gauge apparatus is generally known, and therefore, the press brake itself will not be explained.
  • FIG. 1 illustrates a back gauge apparatus 1 according to an embodiment of the present invention.
  • the back gauge apparatus 1 is installed in a press brake (not illustrated) having a lower tool 3. Relative to the lower tool 3, the back gauge apparatus 1 is moved and positioned in a front-rear direction (a Y-axis direction) and a left-right direction (an X-axis direction) .
  • the press brake has a pair of left and right guide members 5 extending in the front-rear direction.
  • the guide members 5 support left and right ends of a stretch 7 that elongates in the left-right direction and is movable in the front-rear direction.
  • the stretch 7 has guide members 9 that extend in the left-right direction and support a slide body 11 of the back gauge apparatus 1.
  • the slide body 11 is movable in the left-right direction along the guide members 9.
  • the stretch 7 is moved and positioned in the front-rear direction with a ball screw mechanism driven by a servomotor, or with a linear motor (not illustrated) .
  • the slide body 11 is moved and positioned in the left-right direction with a ball screwmechanism or a linear motor (not illustrated) .
  • the mechanism to move and position the stretch 7 in the front-rear direction and the mechanism to move and position the slide body 11 in the left-right direction are already known, and therefore, the mechanisms to move and position the back gauge apparatus 1 in the front-rear (Y-axis) and left-right (X-axis) directions will not be explained.
  • the slide body 11 of the back gauge apparatus 1 has a work contact member 13 that is movable in the front-rear direction and has a work contact face 13A which a rear end of a work W comes into contact with.
  • a pushing unit 15 Arranged between the work contact member 13 and the slide body 11 is a pushing unit 15 made of a resilient member such as a coil spring to bias the work contact member 13 frontward (leftward in Fig. l).
  • a stopper (not illustrated) to prevent the work contact member 13 from dropping frontward from the slide body 11 due to the pushing force of the pushing unit 15.
  • the slide body 11 is provided with a fixing unit 17 to fix the work contact member 13 to the slide body 11 against the pushing force of the pushing unit 15, thereby preventing the work contact member 13 from moving rearward. More precisely, the slide body 11 has a pivot 19 that rotatably supports an L-shaped rotary lever 21. A first end of the rotary lever 21 has a magnet 23 that magnetically attracts a part 11A of the slide body 11. In a normal state, the rotary lever 21 is magnetically attached to the part 11A due to the action of the magnet 23.
  • the work contact member 13 integrally has a pressing member 25 to press a second end of the rotary lever 21 rearward. More precisely, when the work contact member 13 is at a foremost position pushed by the pushing unit 15, a rear end of the pressing member 25 is in contact with the second end of the rotary lever 21.
  • the work contact member 13 When the back gauge apparatus 1 is moved frontward (leftward in Figs. 1 and 2 ) and positioned in the front-rear direction, the work contact member 13 may come into contact with a work W simply placed on the lower tool 3 or an obstacle such as the hand of a worker put behind the lower tool 3. In this case, the work contact member 13 is pressed rearward. If the back gauge apparatus 1 is further moved frontward under this situation, the work contact member 13 more intensely pushes the obstacle frontward.
  • the magnetic fixation by the magnet 23 is set in advance to be released if the pressing force of the work contact member 13 acting on the obstacle reaches a predetermined value of, for example, 150 N. Namely, the magnetic fixation by the magnet 23 is released if the pressing force acting on the obstacle reaches the predetermined force of, for example, 150 N. In other words, until the pressing force that relatively pushes the work contact member 13 rearward reaches the predetermined value, the work contact member 13 is kept immobile.
  • the work contact member 13 comes into contact with an obstacle during a front-rear movement of the back gauge apparatus 1 and if the magnetic fixation by the magnet 23 is released thereby, force that pushes the work contact member 13 frontward suddenly drops to the pushing force of the pushing unit 15, e.g., 50 N. If the work contact member 13 is further pressed rearward by the obstacle after the release of the magnetic fixation by the magnet 23, the pushing unit 15 gradually contracts to gradually increase pressing force applied to the obstacle.
  • the work contact member 13 presses the obstacle with a given force.
  • the magnetic fixation by the magnet 23 is released, the pressing force acting on the obstacle suddenly drops. Since the frontward pressing force acting on the worker's hand or the work suddenly drops, the worker is able to easily sense that the work contact member 13 has come into contact with the obstacle and easily take necessary steps.
  • the back gauge apparatus 1 may have a detector to detect when the magnetic fixation by the magnet 23 is released.
  • the detector may be a sensor to detect when the rotary lever 21 is turned, or a sensor to detect when the work contact member 13 is relatively moved rearward against the pushing force of the pushing unit 15. With such a detector, it is possible to detect when the work contact member 13 comes into contact with an obstacle, or when the fixation of the fixing unit 17 is released. It is possible to make a configuration that immediately stops the advancing of the work contact member 13 when the detector detects the release of the fixation of the fixing unit 17.
  • the work contact member 13 is fixed by magnetic attraction of the magnet 23.
  • the work contact member 13 is stationary against the pressing force of the workW, and therefore, the workWis correctly positioned. Even if the work contact member 13 approaches close to the lower tool 3, it is not necessary to temporarily stop or slow down the work contact member 13 and there is no risk of biting an obstacle between the lower tool 3 and the work contact member 13. Accordingly, the back gauge apparatus 1 of the embodiment is capable of speedily positioning the work W and improving productivity.
  • the present invention is not limited to the above-mentioned embodiment.
  • the present invention allows modifications to realize other embodiments.
  • the magnet 23 attached to the rotary lever 21 of the fixing unit 17 may be replaced with a sucking unit 27 such as a sucker as illustrated in Fig. 3 .
  • This modification also provides effects similar to those of the embodiment mentioned above.
  • the rotary lever 21 of the fixing unit 17 turns in the up-down direction.
  • the rotary lever 21 may be configured to turn horizontally.
  • the back gauge apparatus includes a slide body and a work contact member arranged on the slide body.
  • the work contact member is movable in a front-rear direction and is pushed frontward with a predetermined pushing force.
  • the slide body is provided with a fixing unit that is able to fix the work contact member to the slide body and release the fixation of the work contact member if the work contact member is pushed rearward with a pressing force greater than the predetermined pushing force.
  • the work contact member when the work contact member comes into contact with an obstacle without regard to a front-rear moving position of the back gauge apparatus and when the fixation of the fixing unit is released, the work contact member relatively moves rearward against the pushing force of the pushing unit. Namely, the pressing force of the back gauge apparatus acting on the obstacle changes in two steps. A worker who is holding the obstacle, therefore, is able to know that the back gauge apparatus has come into contact with the obstacle and easily deal with the matter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP15157268.2A 2014-03-07 2015-03-03 Back gauge apparatus Active EP2915604B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014044578 2014-03-07
JP2014228579A JP6397729B2 (ja) 2014-03-07 2014-11-11 バックゲージ装置及びバックゲージ装置の位置決め方法並びにプレスブレーキ

Publications (2)

Publication Number Publication Date
EP2915604A1 EP2915604A1 (en) 2015-09-09
EP2915604B1 true EP2915604B1 (en) 2023-01-18

Family

ID=52596405

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15157268.2A Active EP2915604B1 (en) 2014-03-07 2015-03-03 Back gauge apparatus

Country Status (2)

Country Link
EP (1) EP2915604B1 (ja)
JP (1) JP6397729B2 (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3208008B1 (de) 2016-02-22 2018-03-28 Thalmann Maschinenbau AG Bearbeitungsmaschine für flachmaterialteile und eine auflageeinheit hierfür
AT519203B1 (de) * 2016-10-14 2018-10-15 Trumpf Maschinen Austria Gmbh & Co Kg Hinteranschlag für eine Biegemaschine
CN111300332B (zh) * 2020-03-06 2021-11-09 江苏睿昕汽车科技有限公司 一种离合器成型工装

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0244885Y2 (ja) * 1986-07-07 1990-11-28
US5526672A (en) * 1995-07-20 1996-06-18 Interbold Press brake backgage
JPH09253753A (ja) 1996-03-25 1997-09-30 Amada Co Ltd 板金加工機械の安全装置
US6938454B2 (en) * 2002-05-13 2005-09-06 Trumpf Maschinen Austria Gmbh & Co. Kg. Production device, especially a bending press, and method for operating said production device
EP1503874B1 (de) * 2002-05-13 2006-04-26 Trumpf Maschinen Austria GmbH & CO. KG. Fertigungseinrichtung mit einer biegepresse, und verfahren zum betrieb der fertigungseinrichtung
AT503790B1 (de) * 2006-07-25 2008-01-15 Trumpf Maschinen Austria Gmbh Anschlagvorrichtung für eine biegepresse
AT511111B1 (de) * 2011-04-26 2012-09-15 Trumpf Maschinen Austria Gmbh Verfahren zur signalisierung einer korrekten werkstückpositionierung in einer werkzeugmaschine

Also Published As

Publication number Publication date
JP2015180508A (ja) 2015-10-15
JP6397729B2 (ja) 2018-09-26
EP2915604A1 (en) 2015-09-09

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