US3839936A - Continuous feed nibbling apparatus - Google Patents

Continuous feed nibbling apparatus Download PDF

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Publication number
US3839936A
US3839936A US00307976A US30797672A US3839936A US 3839936 A US3839936 A US 3839936A US 00307976 A US00307976 A US 00307976A US 30797672 A US30797672 A US 30797672A US 3839936 A US3839936 A US 3839936A
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US
United States
Prior art keywords
workpiece
punch
sheet
holding
moving
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
US00307976A
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English (en)
Inventor
D Daniels
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 Ltd
AMADA LTD US
Original Assignee
AMADA 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 Ltd filed Critical AMADA Ltd
Priority to US00307976A priority Critical patent/US3839936A/en
Priority to CA183,469A priority patent/CA985163A/en
Priority to JP48129772A priority patent/JPS5242265B2/ja
Application granted granted Critical
Publication of US3839936A publication Critical patent/US3839936A/en
Anticipated expiration legal-status Critical
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
    • B21D28/24—Perforating, i.e. punching holes
    • B21D28/26—Perforating, i.e. punching holes in sheets or flat parts
    • B21D28/265—Perforating, i.e. punching holes in sheets or flat parts with relative movement of sheet and tools enabling the punching of holes in predetermined locations of the sheet, e.g. holes punching with template
    • 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
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
    • B21D43/10—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S83/00—Cutting
    • Y10S83/916—Nibbling
    • 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
    • Y10T83/654—With work-constraining means on work conveyor [i.e., "work-carrier"]
    • Y10T83/6545—With means to guide work-carrier in nonrectilinear path
    • 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
    • Y10T83/654—With work-constraining means on work conveyor [i.e., "work-carrier"]
    • Y10T83/6563—With means to orient or position work carrier relative to tool station
    • Y10T83/6564—By pattern or templet

Definitions

  • the workpiece positioning means for the punch press is provided with biasing means for allowing temporary relative movement between the workpiece holding means and the drive for moving the workpiece holding means while the punch is in the workpiece and for restoring the workpiece holding means to its original relative position with the drive after the punch is removed from the workpiece during a nibbling operation.
  • a nibbling operation is done with a punch rapidly reciprocating into and out of a workpiece with the workpiece being moved either manually against the punch or by a numerically controlled workpiece positioning mechanism.
  • the movement of the workpiece positioning mechanism is relatively slow, in some cases less than one-half the potential speed of reciprocation of the punch, due to the fact that the workpiece moving mechanism must wait until the punch is out of the workpiece before it again begins to move the workpiece.
  • the punch can be in the workpiece for as much as one-quarter of a revolution of the eccentric or onequarter of a complete reciprocating stroke of the punch.
  • a signal is normally sent to the workpiece moving mechanism to indicate that the punch has become completely free from the workpiece; next the workpiece is fed to its new position, and a second signal is sent to the punch drive when the workpiece reaches its new position; next the punch again begins its downward travel and the workpiece positioning means stops movement as the punch enters the material.
  • the stopping and starting of the workpiece positioning means and the punch drive both of which constitute considerable mass, slows considerably the potential nibbling speed at which the punch can operate.
  • Still another object of this invention is to provide adjustable resilient means for restoring the relative position between the workpiece hodlding means and the drive for moving the workpiece holding means.
  • connection between the workpiece holding means and the drive means for moving the holding means includes a resilient or resilient lost-motion mechanism that allows the holding means to stop during the engagement of the workpiece by the punch but upon withdrawal of the punch from the material the resilent means rapidly overtakes the drive means to reposition the workpiece prior to the next stroke of the punch.
  • the resilient means includes springs and in another form of the invention the biasing means includes adjustable springs such as a pressurized air supply.
  • the air supply is responsive to a sensor indicating the position of the punch relative to the workpiece so that the air pressure and thus the biasing force can be varied depending upon whether the punch is in or out of the workpiece.
  • FIG. 1 is a plan view of a workpiece positioning mechanism embodying the principles of the invention.
  • FIG. 2 is a fragmentary vertical section taken along 2-2 of FIG. 1.
  • FIG. 3 is a fragmentary section taken along the lines 3-3 of FIG. 2.
  • FIG. 4 is a view similar to FIG. 3 illustrating a preferred modification of a device shown in FIG. 1 and employing an air spring configuration.
  • FIG. 5 is a fragmentary vertical section taken along the line 5-5 of FIG. 4.
  • FIG. 6 is a vertical fragmentary section illustrating still another modified embodiment of the invention.
  • workpiece positioning means 12 are clamped to a workpiece W which is supported on a work table or surface 14.
  • the workpiece positioning means and table are a part of a punch press preferably of the type illustrated in US. Pat. No. 3,717,061 the description of which is incorporated herein by reference thereto.
  • the workpiece positioning means locates the workpiece beneath a punch in both the X and Y axes of movement simultaneously or independently preferably by a numerical control.
  • the feed rate of the workpiece is one thousand inches per minute during standard punching operations in which the punch is removed from the material and the workpiece moved a considerable distance to the next punching location.
  • a typical eccentrically driven punch operates at 90 revolutions per minute in this standard punching mode.
  • Most punch presses have an additional operating capability known as nibbling. In nibbling, the reciprocatory speed of the punch is increased typically to about 200 strokes per minute and the feed rate of the workpiece is reduced to a much smaller speed, typically 100 inches per minute.
  • the punch is within the workpiece roughly 25% of the revolution of the eccentric or 25% of each down and up stroke of the nibbling punch.
  • the nibbling punch can take many forms one of which would be a square punch taking, for example, a one-half inch cut with each stroke at the above speeds and is typically used to form slots such as the one indicated by the reference numeral 15.
  • the numerical control of the workpiece positioning means also allows a round punch to be used to cut an irregular slot such as that indicated by the reference numeral 16.
  • the punch and the workpiece positioning drive can be run continuously during nibbling for either of the operations suitable for cutting the slot or 16 or for any other nibbling operation.
  • the workpiece positioning means includes a moving means or drive 18 having a conventional worm gear 20 that drives a carriage 22.
  • Lost-motion-biasing means are provided between the drive means and the workpiece gripping clamps 24 to allow the workpiece to stop movement as the worm gear 20 continues to drive the transport or carriage 22 during the period the punch is within the workpiece and at the moment the punch leaves the workpiece, moves the clamps to catch-up to the original relative position of the clamps with the carriage 22.
  • the lost-motion-biasing means includes a housing 26 that is adjustably secured to the carriage 22 by conventional jaws 28.
  • the housing is joined to the clamps 24 by a transfer plate 30 that is secured to the clamp 24 and to a floating plate 32 forming part of the housing.
  • the floating plate 32 can be rigidly secured in the housing 26 by a pneumatically actuated shot-pin 34 which upon receipt of pressure from an air line 36 drives the shot-pin into a conical opening, 38.
  • the workpiece clamp and the housing 26 are rigidly locked together for normal or conventional positioning of the workpiece either in the punching mode or for transporting the workpiece to different locations to begin successive nibbling modes.
  • one embodiment for providing a biased self-centering, lost-motion, interconnection between the floating plate 32 and the housing 26 is provided by a plurality of springs 40 each housed in a hollow centering post 42 which is slidably received in a horizontal bore 44.
  • the outer end of each bore is capped by an adjustableplug 46 to serve as a stop against outward movement of the spring.
  • the inner end of the post 42 is provided with a shoulder 48 that engages against the inner end of the bore 44 to limit inward movement of the post 42.
  • the four posts when positioned in their innermost condition center the floating plate 32 within a circular recess 50 provided in the housing 26.
  • 200 hits per minute and a feed rate of 200 inches per minute it can be seen that each cut of the punch will be one inch per hit.
  • the size of the recess 50 must provide for a one-quarter inch float capacity.
  • the clamps 24 are closed by pneumatic pressure acting on a piston 54 via a line 55.
  • the introduction of air pressure to the top of the piston 54 pushes the top clamp 56 about a pivot 58, counter-clockwise as shown in FIG. 2, and against a release spring 60. Termination of the air pressure through line allows the spring 60 to rock the clamp 56 clockwise to open the clamp for insertion or removal of the workpiece.
  • a bar 62 joins both sets of clamps 24.
  • the bar is releasably secured to the clamps by set screws 66.
  • the set screws 66 and the jaws 28 are, of course, both releasable so that the workpiece clamps 24 can be moved relative to one another to accommodate various sized workpieces.
  • FIGS. 4 and 5 A second embodiment of the invention is illustrated in FIGS. 4 and 5.
  • the floating plate 32 is again centered in the circular recess 50 in the housing 26.
  • this embodiment employs adjustable springs in the form of a plurality of pistons 68 attached to centering posts 70.
  • the pistons slide in bores 72 and the inner ends of the pistons abut against the inner ends of the bores 72 to limit the inward movement of the centering posts 70.
  • Air at a predetermined pressure is applied through a common channel 74 and biases each of the pistons toward the center of the plate 32 thus centering the plate in the recess 50.
  • the plate can be moved, however, in any direction provided it has received sufficient force to compress the air behind the piston in the direction to which it is urged. Air behind the piston or pistons being pushed by the floating plate 32 will compress in channel 74 and upon release of the pressure acting on floating plate 32, will restore the pistons to their innermost positions again centering the floating plate.
  • the air pressure can be a constant for any particular workpiece, the amount of pressure being dependent upon the weight of the workpiece and the amount of friction necessary to overcome when centering the floating plates.
  • the desired air pressure would be minimized while the punch is in the workpiece and thus the workpiece is being held stationary and maximized when the punch leaves the workpiece and the floating plates are being urged back into their centermost positions as in the next-described embodiment.
  • FIG. 4 Another embodiment of this invention is to synchronize the position of the punch relative to the workpiece with the amount of pressure being applied on the pistons acting against the floating plate 32. As stated above, this provides the optimum responsiveness in restoring the workpiece to its original position.
  • FIG. 4 a schematic illustration is shown in FIG. 4 which includes a pressurized air line 80 connected to the pressurized air supply 82 by a two way valve 84.
  • a sensor S determines when the punch P is in or out of the workpiece W. When the punch is in the workpiece, the sensor S sends a signal to the valve 84 to reduce the pres sure in line 80 to between about zero to psi.
  • valve 84 When the sensor determines the punch is out of the workpiece, it again sends a signal to valve 84 to immediately increase the pressure to about 100 psi so that the workpiece is restored quickly by the pistons to the same location it would have been if the workpiece had been rigidly coupled to the drive 18.
  • FIG. 6 Still another embodiment of the invention is illustrated in FIG. 6.
  • two shot-pins 90 are driven into conical bores 92 in the floating plate 32 to not only lock each floating plate 32 in its housing 26 but also align it about its center of rotation.
  • the workpiece clamps 24 and the workpiece W become a rigid linkage for maintaining squareness of the floating plates 32 about their axes of rotation. That is, if sufficient clamping force is provided on the workpiece, the two workpiece clamps 24 and the workpiece become a rigid link to prevent skewing of the clamps about their respective centers of the floating plates 32.
  • the disadvantage of this embodiment is that the workpiece clamps must be designed to have sufficient strength and clamping force to effect the rigid connec tion with-the workpiece and, of course, the workpiece itself, must be of sufficient thickness to complete the rigid link.
  • Apparatus for providing continuous workpiece feeding in a nibbling operation of a punch press comprising means for supporting a sheet material workpiece to be punched,
  • punch means operable in a nibbling mode to rapidly reciprocate a punch through a workpiece, workpiece positioning means for moving the workpiece over the supporting means,
  • said workpiece positioning means including means for holding the workpiece, means for moving the workpiece holding means to advance the workpiece. and biasing means for allowing temporary relative movement between the holding means and the moving means while the punch is in the workpiece and for restoring the holding means to its original relative position with the moving means after the punch is removed from the workpiece.
  • said biasing means including housing means coupled to said moving means, floating plate means resiliently coupled to said housing means and rigidly secured to said workpiece holding means, and means for resiliently holding said plate means centrally in said housing means.
  • biasing means including an adjustable air supply, and a plurality of airactuated pistons.
  • said means for moving said workpiece holding means including a feed screw.
  • said workpiece holding means including at least two workpiece engaging clamps and means for selectively locking said clamps together for conjoint movement to prevent skewing of the clamps relative to said moving means.
  • biasing means including latch means for preventing said temporary relative movement between the holding means and the moving means for use in regular punching operations.
  • said biasing means including housing means coupled to said moving means.
  • floating plate means resiliently coupled to said housing means and rigidly secured to said workpiece holding means, and means for resiliently holding said plate means centrally in said housing means.
  • said means for resiliently holding said floating plate means centrally including a plurality of pistons equidistantly spaced around said floating plate means, means for providing pressurized air against said pistons for biasing said pistons centrally, said housing means including a recess for receiving the plate means and allowing limited lateral movement of the floating plate means in said recess, each said piston including a rod having an end engaging the floating plate means when the piston is bottomed out in said housing means so that the floating plate means can move only by overcoming the pressurized air.
  • said adjustable air supply including means for sensing the presence of the punch in and out of the workpiece and control means responsive to said sensing means for lowering the pressure acting on said pistons when the punch is in the workpiece and raising the pressure acting on the pistons when the punch is out of the workpiece.
  • said means for providing pressurized air including means for raising and lowering the pressure of the air, a sensor for determining the location of the punch in and out of the workpiece, and air pressure control means responsive to said sensor for lowering the air pressure when the punch is in the workpiece and raising the air pressure when the punch is out of the workpiece.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Punching Or Piercing (AREA)
  • Accessories And Tools For Shearing Machines (AREA)
US00307976A 1972-11-20 1972-11-20 Continuous feed nibbling apparatus Expired - Lifetime US3839936A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US00307976A US3839936A (en) 1972-11-20 1972-11-20 Continuous feed nibbling apparatus
CA183,469A CA985163A (en) 1972-11-20 1973-10-16 Continuous feed nibbling apparatus
JP48129772A JPS5242265B2 (enrdf_load_stackoverflow) 1972-11-20 1973-11-20

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00307976A US3839936A (en) 1972-11-20 1972-11-20 Continuous feed nibbling apparatus

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US3839936A true US3839936A (en) 1974-10-08

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US00307976A Expired - Lifetime US3839936A (en) 1972-11-20 1972-11-20 Continuous feed nibbling apparatus

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US (1) US3839936A (enrdf_load_stackoverflow)
JP (1) JPS5242265B2 (enrdf_load_stackoverflow)
CA (1) CA985163A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4143571A (en) * 1976-04-26 1979-03-13 Blackman Martin Group Limited Assemblies for workpiece positioning
EP0032628A3 (en) * 1979-12-20 1981-10-07 Joseph Rhodes Limited Punch press
WO1981002861A1 (en) * 1980-04-10 1981-10-15 Mercer Nairne & Co Ltd Workpiece clamp
FR2490527A1 (fr) * 1980-09-24 1982-03-26 Amada Co Ltd Dispositif de serrage de pieces pour machine-outil
US4372183A (en) * 1979-12-07 1983-02-08 Pullmax Aktiebolag Program controlled punching and nibbling machine
US5367770A (en) * 1993-05-03 1994-11-29 Masco Industries, Inc. Method for embossing indented door light opening edge
US20150290826A1 (en) * 2012-11-30 2015-10-15 Toyota Jidosha Kabushiki Kaisha Cutting apparatus and cutting method

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5614889Y2 (enrdf_load_stackoverflow) * 1975-02-13 1981-04-08
JPS564365B2 (enrdf_load_stackoverflow) * 1975-02-25 1981-01-29
JPS591523U (ja) * 1983-04-25 1984-01-07 新明和工業株式会社 板状体位置決め供給装置
JPS591522U (ja) * 1983-04-25 1984-01-07 新明和工業株式会社 板状体移送位置決め機構

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2623590A (en) * 1947-07-11 1952-12-30 Continental Can Co Apparatus for cutting scrolled sheets from continuously fed metal strips
US3230810A (en) * 1962-01-11 1966-01-25 Pullmax Ab Attachment for material working machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2623590A (en) * 1947-07-11 1952-12-30 Continental Can Co Apparatus for cutting scrolled sheets from continuously fed metal strips
US3230810A (en) * 1962-01-11 1966-01-25 Pullmax Ab Attachment for material working machine

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4143571A (en) * 1976-04-26 1979-03-13 Blackman Martin Group Limited Assemblies for workpiece positioning
US4372183A (en) * 1979-12-07 1983-02-08 Pullmax Aktiebolag Program controlled punching and nibbling machine
EP0032628A3 (en) * 1979-12-20 1981-10-07 Joseph Rhodes Limited Punch press
WO1981002861A1 (en) * 1980-04-10 1981-10-15 Mercer Nairne & Co Ltd Workpiece clamp
EP0038198A1 (en) * 1980-04-10 1981-10-21 Joseph Rhodes Limited Workpiece clamp
FR2490527A1 (fr) * 1980-09-24 1982-03-26 Amada Co Ltd Dispositif de serrage de pieces pour machine-outil
US4422628A (en) * 1980-09-24 1983-12-27 Amada Company, Limited Clamping apparatus
US5367770A (en) * 1993-05-03 1994-11-29 Masco Industries, Inc. Method for embossing indented door light opening edge
US20150290826A1 (en) * 2012-11-30 2015-10-15 Toyota Jidosha Kabushiki Kaisha Cutting apparatus and cutting method

Also Published As

Publication number Publication date
JPS5242265B2 (enrdf_load_stackoverflow) 1977-10-24
CA985163A (en) 1976-03-09
JPS49124689A (enrdf_load_stackoverflow) 1974-11-28

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