US3426635A - Arrangement in sheet metal working machines,particularly nibbling machines - Google Patents

Arrangement in sheet metal working machines,particularly nibbling machines Download PDF

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Publication number
US3426635A
US3426635A US575817A US3426635DA US3426635A US 3426635 A US3426635 A US 3426635A US 575817 A US575817 A US 575817A US 3426635D A US3426635D A US 3426635DA US 3426635 A US3426635 A US 3426635A
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US
United States
Prior art keywords
machines
nibbling
stroke
link
crank
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
US575817A
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English (en)
Inventor
Sven Nicklasson
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Pullmax AB
Original Assignee
Pullmax AB
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Filing date
Publication date
Application filed by Pullmax AB filed Critical Pullmax AB
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Publication of US3426635A publication Critical patent/US3426635A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D27/00—Machines or devices for cutting by a nibbling action
    • 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
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18056—Rotary to or from reciprocating or oscillating
    • Y10T74/1816—Crank, lever, toggle, and slide
    • 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
    • Y10T83/869—Means to drive or to guide tool
    • Y10T83/8696—Means to change datum plane of tool or tool presser stroke
    • 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
    • Y10T83/869—Means to drive or to guide tool
    • Y10T83/8696—Means to change datum plane of tool or tool presser stroke
    • Y10T83/87—By varying length of tool stroke
    • 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
    • Y10T83/869—Means to drive or to guide tool
    • Y10T83/8821—With simple rectilinear reciprocating motion only
    • Y10T83/8841—Tool driver movable relative to tool support
    • Y10T83/8845—Toggle links, one link pivoted to tool support

Definitions

  • a toggle arrangement for sheet metal Working machines wherein a toggle mechanism imparts a reciprocating movement to a tool.
  • the toggle mechanism includes a pair of toggle levers pivotally connected adjacent one end thereof. The other end of one of the toggle levers is connected to the tool holder and the other end of the other toggle lever is connected to the machine frame by means of an adjustment device for permitting the position of the toggle pin tobe adjusted.
  • the toggle mechanism is moved by a drive means which causes the working stroke to occur when the remote ends of the toggle levers approach each other.
  • the short stroke technique can be used for, e.g. cutting, shaping or other methods of plastic deformation of material.
  • cutting knives being used that have relatively short cutting edges and that are so designed that curved as Well as straight cuts can be made.
  • Other applications are shaping, such as beading, creasing, joggling, or edge folding.
  • Nibbling constitutes a special application, Le. a form of continuous punching.
  • link movements are used to impart the required reciprocating movement to the upper tool in a short-stroke machine. Requirements are thus that the amplitude of the impact movement can be adjusted and that it is possible to switch the entire impact movement between a working position and a neutral position.
  • link motion is the normal crank movement, the upper tool being connected, via a connecting rod, to a rotating crank.
  • the amplitude can thus be adjusted by providing the rotating crank shaft with an adjustable double eccentric, whereby the crank radius can be varied.
  • Adjustment into neutral can be effected by moving the crank shaft vertically by means of some suitable device, for instance by mounting the crank shaft eccentrically in a rotatable bushing.
  • the impact movement can also be caused by means of a toggle-joint link system as disclosed in Swedish Patent 127,977 and Swedish Patent No. 186,016, which corresponds to US. Patent No. 2,986,947.
  • the amplitude of the moveable tool is adjusted by causing the pivoting center points of the link system, in their end positions, to adopt different side positions relative to a plane parallel with the direction of movement of the upper tool.
  • the tool is put into neutral by adjusting its upper, stationary pivot point to various height positions.
  • the bottom position of the tool is always the same, independent of amplitude.
  • the above link system is well suited for convential cutting and shaping operations.
  • simple crank movement the movement graph of the upper tool, as a function of the time, appears substantially as a sine curve, as also does the movement graph obtained with the toggle-joint movement.
  • This geometry of movement is suitable with respect to the forces which develop when cutting or shaping.
  • the force exterted on the driving, rotating crank shaft, when movement is constant is relatively less and the velocity of the tool relatively greater compared. with the ratio at the end of the working stroke. This corresponds rather Well to the force development which ought to arise when carrying out each separate working stroke during clipping or shaping respectively.
  • the nibbling tool comprises, for instance, a circular-cylindrical punch, generally with a fiat end surface, which cooperates with a die having a corresponding circular opening. At every stage a chip is punched out which has the shape of a quarter moon.
  • the punch usually travels down until its end surface meets the upper, flat working surface of the die. When the punch has completed its cutting action it returns to the upper working position and the plate is advanced one step; whereafter the operation is repeated.
  • the distance through which the plate is advanced constitutes approximately 25 to 30% of the diameter of the punch.
  • the force graph is enacted differently than in the case, for instance, when cutting or shaping.
  • the maximum force shall be developed when the punch meets the Work piece, which force successively decreases while cutting is being effected so that the requisite force at the end of the stroke is zero. It is also desirable that the speed of the punch is relatively low at the beginning, to avoid damaging impact forces and hammering on the work piece and, further, the punch speed should be increased towards the end of the stroke so that the cut chip is more easily knocked out through the die.
  • the present invention provides a solution tothe problem, by means of a link movement of favorably adapted dimensions causing the movement of the punch to be such that it:
  • the invention comprises an arrangement in sheet-metal working machines, particularly for nibbling and punching, in which the tool is imparted a reciprocating movement by means of a toggle lever provided with a link pin, the position of which can be adjusted, and a link pin connected with a tool, tool holder or the like, the toggle lever pin being arranged to obtain a reciprocating movement, and the tool holder being adapted to carry out the working stroke during the moment of movement at which the two first mentioned link pins approach each other.
  • FIGS. 1 and 2 diagrammatically show the arrangement according to the invention in various working posi tions and FIGS. 37 show various graphs of stroke movements, as a function of the time.
  • the arrangement is substantially constructed along the same lines as those disclosed in the said Swedish patents. However, in this case the function and working principle of the arrangement is inverted.
  • the arrangement comprises a crank 11 rotatable about a crank shaft axis 1 and having a pivoting radius R, and adapted to rotate in the direction indicated by the arrow.
  • the crank 11 is laterally adjustable to stationary positions. Two positions of the revolution of rotation are indicated by the reference numerals 2 and 3 respectively.
  • a connecting rod V is pivotally connected with two link arms A and B.
  • the link arm B is pivotally connected at its other end to the frame of the machine, at point 6 which can be made adjustable to stationary positions.
  • the link arm A is connected at its other end with a tool holder RA at point 8.
  • the tool holder RA is guided for vertical movements and encloses completely the link arms, besides which it is connected at the bottom with a tool in the form of a nibbling punch N.
  • the link arms A and B On rotation of the crank 11 the link arms A and B, as a result of the movements of the connecting rod, move at the point where they are connected with the connecting rod between positions 4 and 5, the end of the link arm A moving between the points 7 and 8.
  • the links In position 7 the links form a straight line and the tool lies in an unchan-geable, upper working posi tion.
  • the punch is drawn downwards.
  • the geometry of motion is then such as that the tool moves according to the graph shown in FIG. 3, at a relatively low speed at the beginning but which increases during the stroke.
  • the rotatable crank 11 can be mounted relative to the machine frame by means of an adjustment device so as to permit the position of the crank shaft axis 1 to be varied as desired.
  • the connecting rod V is pivotally connected to a crank pin mounted on crank 11 so as to be adjustable to positions 2 and 3 as illustrated in FIGURE 1.
  • the crank 11, which is rotatable about the crank shaft axis 1, is eccentrically mounted on an adjustment member 12 rotatable about an axis 113 parallel to the crank shaft axis 1.
  • crank 11 By rotating the member 12 about the axis 13, the crank 11 may be adjusted into a number of fixable positions having different distances from the line of movement of the punch N.
  • Such adjustment structure is shown merely for purposes of illustra- 4 tion and is old and well known, being illustrated in U.S. Patent No. 2,986,947.
  • the function can be further improved by means of the adjustment according to FIG. 2.
  • the end positions of the intermediate point of the link system are thus displaced relative to the plane through the tool holder, e.g. by moving the position of the rotating crank shaft axis from 1 to 1'.
  • the intermediate point of the link system thereby rotates between the positions 4' and 5'.
  • the motion graph of the tool thus obtains the form shown in FIG. 4, which puts additional time at disposal for advancing the work piece at a certain length of stroke S2.
  • a small intermediate length of stroke S3 is obtained.
  • the characteristic of the motion geometry during the effective length of stroke is similar to that according to FIG. 3.
  • the motion graph of the tool can be made to take, within wide limits, such a form that a period of time, suitably adapted for each case, between each out can be placed at disposal (see FIG. 4).
  • the lateral displacement of the center of the crank shaft can also be combined with such lateral adjustment of the stationary linkage point 6 as mentioned in Swedish Patent 127,977 or 186,016.
  • the stationary linkage point 6 is lifted by means of some suitable device.
  • This can be effected for instance, by mounting the link pin 6 eccentrically on an adjustment member 14 having an axle .15 rotatably mounted relative to the machine frame whereby the adjustment member 14 can be rotated so as to adjust and fixedly secure the link point 6 in a pluarity of various positions having diflferent heights.
  • the arrangement can be designed, for instance, as shown in Swedish Patent 127,977.
  • FIGS. 5-7 Three practical cases with respect to the geometry of motion of the punching tool are illustrated in FIGS. 5-7.
  • the following designations are used in conjunction herewith:
  • T the time for one revolution of the crank shaft (a completed movement period).
  • T time during which the punch is engaged (the length of time during which the punch moves within the plate).
  • T the time for moving the plate at each feed step.
  • a the length of the toggle link (the link arms A and B).
  • the latenal displacement is such that the links A and B assume a straight line when the crank shaft is rotated through 40.
  • the length of stroke in this case is 12.9 mm.
  • S is equal to 8 mm.
  • the ratio T /T :1.57 With such lateral displacement of the crank shaft a longer advancing interval T is obtained than in the case with adjustment according to FIG. 5.
  • the ratio T /T :l.57 by reasons of symmetry,
  • a sheet metal working machine particularly for nibbling and punching, comprising:
  • a tool holder carrying a tool and mounted on said machine frame for reciprocating rectilinear movement
  • toggle means including a pair of toggle levers connected between said machine frame and said tool holder for causing said tool holder to canny out its working stroke as said pair of toggle levers pivotally move toward one another, the adjacent and of said pair of toggle levers being pivotally connected at a first link point and the remote end of one of said toggle levers being pivotally connected to said machine frame at a second link point and the remote end of the other toggle lever being pivotally connected to said tool holder at a third link point;
  • a sheet metal working machine according to claim 1, wherein the tool holder is in its maximum retracted position when the three toggle link points are positioned on a straight line.
  • a sheet metal working machine wherein the tool holder comprises a frame-like member which encloses the pair of toggle levers and the adjustment means connecting the second link point to the machine frame.
  • said drive means includes a rotatable crank member and a connecting rod pivotally coupled at opposite ends thereof to the rotatable crank member and to the toggle means at the first link point, and further including adjusting means connecting said rotatable crank member to said machine frame for permitting the rotational axis of said crank member to be fixedly secured in a plurality of different positions in order to vary the distance between the rotational axis of the crank member and the center line of the reciprocal tool holder.
  • a sheet metal working machine wherein the adjusting means permits the rotational axis of the crank member to be adjusted such that the first link point will execute pivoting movements on both sides of a line connecting the second and third link points as the crank mem'ber undergoes a single revolution.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Shearing Machines (AREA)
US575817A 1965-08-27 1966-08-29 Arrangement in sheet metal working machines,particularly nibbling machines Expired - Lifetime US3426635A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE11237/65A SE313719B (xx) 1965-08-27 1965-08-27

Publications (1)

Publication Number Publication Date
US3426635A true US3426635A (en) 1969-02-11

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ID=20293588

Family Applications (1)

Application Number Title Priority Date Filing Date
US575817A Expired - Lifetime US3426635A (en) 1965-08-27 1966-08-29 Arrangement in sheet metal working machines,particularly nibbling machines

Country Status (7)

Country Link
US (1) US3426635A (xx)
CH (1) CH449389A (xx)
DE (1) DE1552658C3 (xx)
ES (1) ES330597A1 (xx)
GB (1) GB1129247A (xx)
NL (1) NL150031B (xx)
SE (1) SE313719B (xx)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3682029A (en) * 1970-04-13 1972-08-08 Schwabe Inc Herman Balanced and double action cutting apparatus
US3785282A (en) * 1970-06-10 1974-01-15 Zdarske Strojirny A Slevarny Mechanical press with toggle lever crank drive
US4085779A (en) * 1977-04-06 1978-04-25 The Kartridg Pak Company Packaging machine
US5123889A (en) * 1990-10-05 1992-06-23 Ranpak Corporation Downsized cushioning dunnage conversion machine and cutting assemblies for use on such a machine
US5189922A (en) * 1989-05-09 1993-03-02 Parashikov Peter H Force impulse generator
US5448933A (en) * 1994-03-01 1995-09-12 The Whitaker Corporation Stamping machine stripper and die set
US5584741A (en) * 1995-05-22 1996-12-17 Seven Seas Plastic Fty Ltd. Halloween toy
US5868657A (en) * 1995-06-07 1999-02-09 Ranpak Corp. Cushioning conversion system with accumulator conveyor
US6311596B1 (en) 1990-10-05 2001-11-06 Ranpak Corp. Cutting assembly for a cushioning conversion machine
CN110024101A (zh) * 2016-11-30 2019-07-16 龙云株式会社 对准机构、卡盘装置及贴合装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012102525B4 (de) * 2012-03-23 2018-12-27 Schuler Pressen Gmbh Pressenantrieb mit mehreren Betriebsmodi für eine Presse und Verfahren zum Betreiben eines Pressenantriebs

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US304673A (en) * 1884-09-02 Electric-arc
US2494413A (en) * 1946-02-06 1950-01-10 Verkst S A B Haldex Machine for cutting sheet metal
US2986947A (en) * 1955-04-18 1961-06-06 Svelsmekano Ab Control movement for cutting tool in metal plate cutting machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US304673A (en) * 1884-09-02 Electric-arc
US2494413A (en) * 1946-02-06 1950-01-10 Verkst S A B Haldex Machine for cutting sheet metal
US2986947A (en) * 1955-04-18 1961-06-06 Svelsmekano Ab Control movement for cutting tool in metal plate cutting machine

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3682029A (en) * 1970-04-13 1972-08-08 Schwabe Inc Herman Balanced and double action cutting apparatus
US3785282A (en) * 1970-06-10 1974-01-15 Zdarske Strojirny A Slevarny Mechanical press with toggle lever crank drive
US4085779A (en) * 1977-04-06 1978-04-25 The Kartridg Pak Company Packaging machine
US5189922A (en) * 1989-05-09 1993-03-02 Parashikov Peter H Force impulse generator
US5123889A (en) * 1990-10-05 1992-06-23 Ranpak Corporation Downsized cushioning dunnage conversion machine and cutting assemblies for use on such a machine
US6311596B1 (en) 1990-10-05 2001-11-06 Ranpak Corp. Cutting assembly for a cushioning conversion machine
US5448933A (en) * 1994-03-01 1995-09-12 The Whitaker Corporation Stamping machine stripper and die set
US5584741A (en) * 1995-05-22 1996-12-17 Seven Seas Plastic Fty Ltd. Halloween toy
US5868657A (en) * 1995-06-07 1999-02-09 Ranpak Corp. Cushioning conversion system with accumulator conveyor
US6475130B1 (en) 1995-06-07 2002-11-05 Ranpak Corp. Cushioning conversion system with stop gate
CN110024101A (zh) * 2016-11-30 2019-07-16 龙云株式会社 对准机构、卡盘装置及贴合装置
CN110024101B (zh) * 2016-11-30 2023-05-02 龙云株式会社 对准机构、卡盘装置及贴合装置

Also Published As

Publication number Publication date
SE313719B (xx) 1969-08-18
CH449389A (de) 1967-12-31
NL6612080A (xx) 1967-02-28
DE1552658B2 (de) 1973-10-18
DE1552658A1 (de) 1971-09-09
DE1552658C3 (de) 1974-05-09
NL150031B (nl) 1976-07-15
GB1129247A (en) 1968-10-02
ES330597A1 (es) 1967-09-16

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