US3758099A - Clamp with workpiece locator - Google Patents

Clamp with workpiece locator Download PDF

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Publication number
US3758099A
US3758099A US00167269A US3758099DA US3758099A US 3758099 A US3758099 A US 3758099A US 00167269 A US00167269 A US 00167269A US 3758099D A US3758099D A US 3758099DA US 3758099 A US3758099 A US 3758099A
Authority
US
United States
Prior art keywords
workpiece
clamp
locator
edge
jaws
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
Application number
US00167269A
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English (en)
Inventor
W Scott
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.)
WHITNEY CORP W
W A Whitney Co
Original Assignee
WHITNEY CORP W
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 WHITNEY CORP W filed Critical WHITNEY CORP W
Application granted granted Critical
Publication of US3758099A publication Critical patent/US3758099A/en
Anticipated expiration legal-status Critical
Assigned to CONTINENTAL BANK N.A., AS AGENT reassignment CONTINENTAL BANK N.A., AS AGENT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: W. A. WHITNEY CORP.
Assigned to W.A. WHITNEY CO. reassignment W.A. WHITNEY CO. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: W. A. WHITNEY CORP.
Expired - Lifetime legal-status Critical Current

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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
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/04—Centering the work; Positioning the tools
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/647—With means to convey work relative to tool station
    • Y10T83/6572—With additional mans to engage work and orient it relative to tool station
    • Y10T83/6574—By work-stopping abutment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/748—With work immobilizer
    • Y10T83/7487—Means to clamp work
    • Y10T83/7547—Liquid pressure actuating means

Definitions

  • locators are movable with the slide and are mounted on the opposite sides of each clamp so as to extend outwardly into position to be engaged by the edge of the workpiece when the latter is placed in the clamps. The locators are retractable away from the edge of the workpiece once the workpiece is clamped in position so that the locators will not be scored and worn by the edge of the workpiece when the clamps are repositioned.
  • This invention relates generally to movable clamps for holding a sheet metal workpiece in a predetermined edgewise position as the workpiece is moved endwise relative to a punch tool which is reciprocated by a punch press to perform a punching operation on the workpiece.
  • the invention relates to a locator with an outer face which is used as a stop to locate the workpiece in the exact predetermined edgewise portion for clamping preparatory to the punching SUMMARY OF THE INVENTION
  • the primary object of the present invention is to provide a locator of the above general character which has a greatly lengthened service life and which remains unscored and unworn in spite of relative sliding movement between the locator and the edge of the workpiece during a punching operation.
  • a further object is to achieve the foregoing by providing a locator which is movable between (a) a propositioned to engage the edge of the workpiece for 10- cating the workpiece in the exact predetermined edgewise position and (b) a retracted position in which the face of the locator is spaced away from the edge of the workpiece to avoid being scored and worn by relative sliding between the workpiece and the locator.
  • Another object is to mount the locator for movement in unison with the clamp so that the locator will be located adjacent the clamp when the workpiece is clamped initially in the edgewise position.
  • FIG. 1 is a fragmentary elevational view of a punch press equipped with apparatus embodying the novel features of the present invention.
  • FIG. 2 is a fragmentary view taken substantially along line 22 of FIG. 1.
  • FIG. 3 is a fragmentary elevational view similar to FIG. 1 but showing parts in moved positions.
  • FIG. 4 is an enlarged plan view of part of the apparatus shown in FIG. I. i
  • FIG. 5 is a partial cross-sectional view taken substantially along line 5--5 of FIG. 4.
  • FIG. 6 is a fragmentary cross-sectional view taken substantially along line 6-6 of FIG. 4.
  • FIG. 7 is an enlarged fragmentary view similar to FIG. Swith parts shwon in cross-section.
  • the present invention is embodied in an apparatus 10 for locatingand holding a sheet metal workpiece 11 on a punch press work table 12 in an exact predetermined edgewise position relative to a reciprocable punch tool I4, the table being mounted on a support such as the bed 13 of the press.
  • the punch tool is operable to punch precisely positioned holes in jected position in which the outer face of the locator is the workpiece in timed relationship to incremental F endwise advancement of the workpiece beneath the punch tool.
  • the workpiece ll initially is located in a precise edgewise position on the table 12 and then is held in such position by two clamps 15 (FIGS. 1 and 2) which grip across the located edge 16 of the workpiece and which are movable along the table 12 to pull the workpiece endwise beneath the punch tool 14.
  • temporary holders l7 clamp the workpiece in the edgewise position (see FIG. 3) thus allowing the two clamps to be repositioned on the workpiece.
  • the clamps are slid in one motion back along the edge of the workpeice and are positioned to once again grip the edge of the workpiece for further incremental movement of the workpiece.
  • the workpiece is held continuously in the edgewise position during the entire punching operation of a single workpiece so that it is unnecessary to relocate the workpiece each time the limits of movement of the clamps are reached.
  • the two clamps 15 are mounted in spaced positions laterally across an elongated slide 19 with the outerends of the clamps overhanging the edge portion of the workpiece 11.
  • the slide is supported on the bed 13 and is numerically controlled for incremental end wise movement to bodily transport the clamps and the workpiece.
  • a threaded lead screw and nut assembly 20 mounted on the underside of the slide as shown in FIGS. 1 and 2 is driven by appropriate mechanism to move the slide.
  • each clamp includes a carrier 21 with two bolts 23 (FIGS. 4 and 5) extended vertically through the carrier and into an elongated slot 24 formed along the eenterline of the upperside of the slide. More particularly, the slot is formed with an inverted T-shaped lateral cross section to receive a similarly shaped bar 25 threaded at its opposite ends on the lower ends of the bolts, the bar holding the carrier on the slide while at the same time allowing adjustment of the carrier along the length of the slot.
  • the clamps can be adjusted toward or away from each other in order to accommodate differently sized workpieces while remaining fixed vertically and laterally on the slide. When the bolts are tightened down, the bar engages the top edges of the slotto prevent movement of the carrieralong the slot.
  • each of the clamps 15 includes a fixed lower jaw 26 (FIG. 5) integrally formed with the outer end of the carrier 21 and an upper jaw 27 which is pivotally mounted on the carrier for movement toward and away from the lower jaw (see FIG. 6) to grip and release the workpiece.
  • the lower jaw is formed with a serrated upper surface 29to insure a tight grip on the workpiece and prevent the workpiece from slipping out of the edgewise position when held by the clamps.
  • the upper jaw is formed generally as a rectangular metal block with one large vertical tooth 30 formed integrally with and extending across the front bottom surface of the block for pressing the workpiece tightly against the lower jaw.
  • Supporting the upper jaw 27 is a pivot shaft 31 mounted between the sides of the carrier 21 and extending through a hole 33 positioned intermediate the ends of the upper jaw so, that the weight of the upper jaw naturally pivots the outer end thereof away from the lower jaw 26 and into an open position as shown in FIG. 6.
  • the inner end of the upper jaw is forced upwardly by a wedge 34 as the latter is moved forwardly through an advance stroke.
  • the wedge is located on the carrier 21 behind the upper jaw and includes a rearwardly inclined front face 35, the wedge being mounted on the outer end of a rod 36.
  • the rod is reciprocated by a hydraulic cylinder (not shown) mounted on the carrier to force the inclined surface of the wedge underneath the inner end of the upper jaw 27 to cause the latter to pivot downwardly on the shaft 31 toward the lower jaw.
  • a roller 37 is journaled between two parallel flanges 39 projecting rearwardly from the inner end of the upper jaw to roll over theinclined surface as the wedge is forced beneath the upper jaw.
  • each locator extends forwardly from the carrier and generally parallel to the sides of the clamp jaws 26 and 27 with the end face of each locator positioned to abut with and align the edge 16 of theworkpiece in an exact edgewise position between the open jaws as the workpiece is slid into the clamps.
  • each locator 40 is retractable to move away from the edge 16 of the workpiece 11 after first locating the latter precisely so that the locator will not be worn and scored by relative sliding movement between the end face of the locator and the edge of the workpiece.
  • each-locator 40 includes a reciprocable rod 43 slidable within a bore or cylinder 41 in the outer end of the carrier 21 and having an outer end projecting through a sleeve 44 in the outer end of the cylinder.
  • the inner end of the rod is connected to a piston 45 slidably mounted within the cylinder for movement toward the outer end thereof as pressure fluid from a suitable pressure source (not shown) is introduced through an opening 46 in the inner end of the cylinder. Movement of the piston outwardly of the'cylinder is limited by engagement of the piston with the sleeve as shown in FIG. 5.
  • the sleeve is threaded into the outer end of the cylinder and may be turned to length or shorten the stroke of the piston in order to adjust the distance the rod protrudes past the end of the carrier for movement between projected and retracted positions shown in FIGS. 5 and 7, respectively.
  • Telescoped over the sleeve 44 and into the cylinder is a spring 47 which is compressed between the sleeve and the piston when the latter is advanced. Upon venting of the pressure fluid, the spring urges the piston toward the inner end of the cylinder th'ereby retracting the rod away from the edge of the workpiece.
  • a removable head 49 Threaded onto the end of the rod is a removable head 49 which is formed of a wear resistant metal and may be replaced as desired.
  • Apparatus for locating a workpiece of sheet material in a predetermined edgewise position for holding the workpiece during the performance of a punching operation on the workpiece by a punch and for advancing the workpiece edgewise between successive punching operations
  • said apparatus comprising a support, a clamp on said support and having a pair of jaws, means for closing and opening said jaws to cause the jaws to grip and release said workpiece, means for moving said clamp on said support and in a direction parallel toone edge of said workpiece to enable advancement of said workpiece when said jaws are closed and to enable return of said clamp along and parallel to the edge of said workpiece when said jaws are open, means for temporarily holding said workpiece in a given position relative to said punch during the return of said clamp when said jaws are open, and a locator carried on said clamp for movement with the latter, said locator being movable relative to said jaws between (a) a projected position in which the locator is engageable by said one edge of said workpiece to locate the latter in a predetermined edgewise position
  • locator includes a reciprocable rod having an outer end extending from said clamp.
  • Apparatus as defined by claim 2 including a removable head of wear resistant material attached to the outer end of said rod for engagement with the edge of the workpiece when said rod is in said projected position, said reversible means comprising a cylinder in said clamp, and a fluid-actuated piston sliclable within said tor is positioned on one side of said clamp, said apparatus further including a second locator positioned on the opposite side of said clamp and movable relative cylinder for forcing said rod to said projected position. 5 thereto between Projected and retracted Positions- 4. Apparatus as defined in claim 2 in which said loca-

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Jigs For Machine Tools (AREA)
US00167269A 1971-07-29 1971-07-29 Clamp with workpiece locator Expired - Lifetime US3758099A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US16726971A 1971-07-29 1971-07-29

Publications (1)

Publication Number Publication Date
US3758099A true US3758099A (en) 1973-09-11

Family

ID=22606656

Family Applications (1)

Application Number Title Priority Date Filing Date
US00167269A Expired - Lifetime US3758099A (en) 1971-07-29 1971-07-29 Clamp with workpiece locator

Country Status (5)

Country Link
US (1) US3758099A (Direct)
CA (1) CA938883A (Direct)
DE (1) DE2236394A1 (Direct)
FR (1) FR2147306A1 (Direct)
IT (1) IT964821B (Direct)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877689A (en) * 1973-08-06 1975-04-15 Pierce All Mfg Ltd Work clamps
US4420912A (en) * 1980-02-27 1983-12-20 Maschinenfabrik Gehring Gesellschaft Mit Beschrankter Haftung & Co. Kommanditgesellschaft Apparatus for holding workpieces during honing work
EP0100283A3 (en) * 1982-07-26 1984-04-11 Bendix Automation Company Universal sheet metal holder
US4515355A (en) * 1982-06-21 1985-05-07 The Warner & Swasey Company Sheet metal workholder utilizing linear wedge action
US4519284A (en) * 1982-07-26 1985-05-28 The Warner & Swasey Company Universal sheet metal holder
US4523749A (en) * 1983-03-02 1985-06-18 W. A. Whitney Corp. Hole forming machine with adjustable work clamps
US4641821A (en) * 1985-03-27 1987-02-10 Jaworski Henry J Workpiece holder
US5149072A (en) * 1988-12-16 1992-09-22 Amada Company, Limited Sheet workpiece positioning device
US5282282A (en) * 1990-03-05 1994-02-01 Shehan Billy C Swimming pool and cover
US5701791A (en) * 1994-09-24 1997-12-30 Trumpf Gmbh & Co. Workpiece processing machine with retractable clamping device
US6148560A (en) * 1998-05-01 2000-11-21 Vinifera, Inc. Grafting machine
US6178860B1 (en) * 1998-09-10 2001-01-30 The Fletcher-Terry Company Matcutter with clamping system and cutting head
US20090179369A1 (en) * 2008-01-16 2009-07-16 Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. Fixture for automatically positioning workpiece
US8151677B1 (en) * 1997-12-24 2012-04-10 Giben International S.P.A. Method and machine for sawing panels with laterally movable pusher
US20150145193A1 (en) * 2013-11-28 2015-05-28 Fanuc Corporation Object fastening device for fastening object to receiving part, machine tool, robot, and method of fastening object to receiving part

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2753935C2 (de) * 1977-12-03 1986-05-28 Alfred Teves Gmbh, 6000 Frankfurt Bremsdrucksteuereinheit für eine hydraulische Fahrzeugbremsanlage
CN104985070B (zh) * 2015-07-13 2016-09-28 桐乡市凤鸣制罐厂 一种马口铁夹紧机构

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1938771A (en) * 1929-12-09 1933-12-12 Cincinnati Milling Machine Co Milling machine
US2472968A (en) * 1942-06-26 1949-06-14 Goldberg Herman Drilling machine
US2600860A (en) * 1949-06-07 1952-06-17 Burndy Engineering Co Inc Fluid pressure operated portable compressing tool
US2692633A (en) * 1952-08-20 1954-10-26 Lee B Green Work gripping chuck mechanism
US3076644A (en) * 1959-08-12 1963-02-05 Wiedemann Machine Company Workholder
US3302494A (en) * 1963-07-08 1967-02-07 Int Standard Electric Corp Automatic drilling machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1938771A (en) * 1929-12-09 1933-12-12 Cincinnati Milling Machine Co Milling machine
US2472968A (en) * 1942-06-26 1949-06-14 Goldberg Herman Drilling machine
US2600860A (en) * 1949-06-07 1952-06-17 Burndy Engineering Co Inc Fluid pressure operated portable compressing tool
US2692633A (en) * 1952-08-20 1954-10-26 Lee B Green Work gripping chuck mechanism
US3076644A (en) * 1959-08-12 1963-02-05 Wiedemann Machine Company Workholder
US3302494A (en) * 1963-07-08 1967-02-07 Int Standard Electric Corp Automatic drilling machine

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877689A (en) * 1973-08-06 1975-04-15 Pierce All Mfg Ltd Work clamps
US4420912A (en) * 1980-02-27 1983-12-20 Maschinenfabrik Gehring Gesellschaft Mit Beschrankter Haftung & Co. Kommanditgesellschaft Apparatus for holding workpieces during honing work
US4515355A (en) * 1982-06-21 1985-05-07 The Warner & Swasey Company Sheet metal workholder utilizing linear wedge action
EP0100283A3 (en) * 1982-07-26 1984-04-11 Bendix Automation Company Universal sheet metal holder
US4519284A (en) * 1982-07-26 1985-05-28 The Warner & Swasey Company Universal sheet metal holder
US4523749A (en) * 1983-03-02 1985-06-18 W. A. Whitney Corp. Hole forming machine with adjustable work clamps
US4641821A (en) * 1985-03-27 1987-02-10 Jaworski Henry J Workpiece holder
US5149072A (en) * 1988-12-16 1992-09-22 Amada Company, Limited Sheet workpiece positioning device
US5282282A (en) * 1990-03-05 1994-02-01 Shehan Billy C Swimming pool and cover
US5701791A (en) * 1994-09-24 1997-12-30 Trumpf Gmbh & Co. Workpiece processing machine with retractable clamping device
US8151677B1 (en) * 1997-12-24 2012-04-10 Giben International S.P.A. Method and machine for sawing panels with laterally movable pusher
US6148560A (en) * 1998-05-01 2000-11-21 Vinifera, Inc. Grafting machine
US6178860B1 (en) * 1998-09-10 2001-01-30 The Fletcher-Terry Company Matcutter with clamping system and cutting head
US6234052B1 (en) * 1998-09-10 2001-05-22 The Fletcher-Terry Company Matcutter with clamping system and cutting head
US20090179369A1 (en) * 2008-01-16 2009-07-16 Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. Fixture for automatically positioning workpiece
US7980539B2 (en) * 2008-01-16 2011-07-19 Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. Fixture for automatically positioning workpiece
US20150145193A1 (en) * 2013-11-28 2015-05-28 Fanuc Corporation Object fastening device for fastening object to receiving part, machine tool, robot, and method of fastening object to receiving part
US10195706B2 (en) * 2013-11-28 2019-02-05 Fanuc Corporation Object fastening device for fastening object to receiving part, machine tool, robot, and method of fastening object to receiving part

Also Published As

Publication number Publication date
DE2236394A1 (de) 1973-02-08
IT964821B (it) 1974-01-31
FR2147306A1 (Direct) 1973-03-09
CA938883A (en) 1973-12-25

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Legal Events

Date Code Title Description
AS Assignment

Owner name: CONTINENTAL BANK N.A., AS AGENT, ILLINOIS

Free format text: SECURITY INTEREST;ASSIGNOR:W. A. WHITNEY CORP.;REEL/FRAME:005659/0180

Effective date: 19900217

AS Assignment

Owner name: W.A. WHITNEY CO.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:W. A. WHITNEY CORP.;REEL/FRAME:005803/0070

Effective date: 19910306