EP0260361B1 - Machine à dresser - Google Patents

Machine à dresser Download PDF

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Publication number
EP0260361B1
EP0260361B1 EP19860307236 EP86307236A EP0260361B1 EP 0260361 B1 EP0260361 B1 EP 0260361B1 EP 19860307236 EP19860307236 EP 19860307236 EP 86307236 A EP86307236 A EP 86307236A EP 0260361 B1 EP0260361 B1 EP 0260361B1
Authority
EP
European Patent Office
Prior art keywords
support member
work roll
rolls
rollers
frame
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
EP19860307236
Other languages
German (de)
English (en)
Other versions
EP0260361A2 (fr
EP0260361A3 (en
Inventor
Charles Robert Bradlee
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.)
Genesis Worldwide Inc
Original Assignee
Genesis Worldwide Inc
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
Priority to US06/726,542 priority Critical patent/US4635458A/en
Application filed by Genesis Worldwide Inc filed Critical Genesis Worldwide Inc
Priority to EP19860307236 priority patent/EP0260361B1/fr
Priority to DE8686307236T priority patent/DE3684919D1/de
Publication of EP0260361A2 publication Critical patent/EP0260361A2/fr
Publication of EP0260361A3 publication Critical patent/EP0260361A3/en
Application granted granted Critical
Publication of EP0260361B1 publication Critical patent/EP0260361B1/fr
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
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers

Definitions

  • the present invention relates to multi-roll leveling apparatus for leveling metal strip material and, more particularly, to leveling apparatus in which the penetration of the work rolls may be varied along the lengths of the work rolls.
  • leveling The process of working the strip to remove such waves, buckles, and other deviations from a planar shape is known as "leveling", and it involves the selective elongation of the strip such that the same amount of material exists per unit length across the width of the strip.
  • the upper and lower work rolls are positioned so that the degree of penetration or nesting decreases from the entry rolls to the exit rolls, so that the amount of flexing decreases from the front to the rear of the leveling apparatus.
  • the final flexing of the sheet by the exit work rolls is just sufficient to return the material to a flat, planar condition.
  • sheet material frequently comprises a combination of wavy edges, center buckles and other deviations from flatness across its width so that it is necessary to vary the penetration of the work rolls along their lengths.
  • Another defect appearing in metal strip coils is longitudinal and transverse curvature. Longitudinal curvature occurs when one surface of the strip is longer than the opposite surface in a lengthwise direction, and transverse curvature occurs when one surface is longer than the opposite surface in a transverse direction. The removal of longitudinal and transverse curvature is accomplished by increasing the penetration of the work rolls uniformly along their lengths. Consequently, two different types of metal working are required to produce a flat strip having both longitudinal and transverse curvature as well as wavy edges and/or center buckles.
  • the Bearer U.S. Patent No. 3,301,031 shows a leveling apparatus in which both the upper and lower sets of work rolls are supported along their lengths by a plurality of back-up roller assemblies.
  • Each roller assembly rests upon a pair of wedges which are adjustable to urge the roller assembly upwardly to deflect the portion of the work roll it supports, and thereby vary the penetration of the upper and lower work rolls at that location.
  • the wedges can be positioned so that the back-up rollers urge the entry work rolls toward the strip material a greater distance than the exit work rolls are displaced, thereby varying the penetration of the work rolls along the length of the leveling apparatus.
  • the Krynytzky U.S.-A-2,963,071 shows a leveling apparatus which includes a plurality of individually adjustable back-up rollers which are spaced along the lengths of the work rolls.
  • Each back-up roller includes a support member having semicircular cavities at its front and rear portions, and the frames which support the support members include a pair of semicircular blocks which matingly engage the cavities.
  • the blocks contact upon longitudinally-adjustable wedges so that the entry or exit portion of the support member may be adjusted to vary the elevation of the back-up rolls and therefore vary the penetration of the work rolls supported by those back-up rollers. As the wedges are displaced, the blocks pivot relative to the frames.
  • British Patent Specification GB-A-1,128,888 discloses a leveling apparatus according to the preamble of claim 1 in which the work rolls are mounted on a frame member which is tiltable or rotatable about mating arcurate bearing surfaces, which varies the vertical spacing between the work rollers at the entrance portion relative to the exit portion of the device. However, it is not possible to vary the spacing of the entry rollers without also varying the spacing of the exit rollers.
  • a disadvantage inherent in the aforementioned levelling devices is that it is difficult to adjust the deflection of the work rolls to correct for one type of defect in a metal strip, such as longitudinal or transverse curvature, without affecting the ability of the work rolls to correct another type of defect, such as wavy edges or center buckles. This results from the difficulty in varying the penetration of the work rolls along their lengths without varying the average penetration of the work rolls along the path travelled by the metal strip. Accordingly, there is a need for a levelling apparatus which may be adjusted to correct for wavy edges and center buckles on a strip without affecting the overall penetration of the work rolls in removing the longitudinal or transverse curvature of a strip.
  • the present invention provides a levelling apparatus of the type having a base, first frame means attached to said base, first work roll means attached to said first frame means, first means for supporting said first work roll means attached to said first frame means, second frame means attached to said base for vertically adjustable movement relative to said first frame means, second work roll means located adjacent to and in nested relation to said first work roll means, and second means for supporting said second work roll means, a back-up block attached to said second frame means and including a longitudinally-extending concave portion, a support member having a longitudinally-extending convex portion extending outwardly therefrom and positioned to matingly engage said concave portion, a plurality of back-up rollers rotatably attached to said support member and positioned to support said second work roll means, means for pivoting said support member relative to said back-up block such that said convex portion slides against said concave portion, whereby said back-up rollers are urged toward or away from said second work roll means so that work rolls thereof may be selectively deflecte
  • Displacement of the support members is caused by a plurality of adjusting screw mechanisms mounted on the top of the upper frame.
  • Each mechanism includes a vertically displaceable jack screw which contacts the support member of an associated back-up roller assembly. Downward displacement of the jack screws causes the support members to rotate on their respective back-up blocks so that the convex portions of the support members slide against the concave portions of the back-up blocks.
  • each individual back-up roller assembly mounted on the upper frame may be individually adjusted to increase or decrease penetration of the portion of the upper work rolls directly beneath it, but such variances decrease with each succeeding work roll from front to rear, such that the penetration of the rearmost top work roll is unaffected.
  • the leveling device of the present invention is therefore capable of removing both the wavy edges or center buckle defects and the transverse or longitudinal curvature defects from a strip since both the average penetration of the work rolls may be adjusted as well as, and independently of, the penetration of specific segments along the lengths of the work rolls. Therefore, the leveling apparatus of the present invention is capable of removing the two most common defects in strip material in a single pass.
  • individually adjustable back-up roller assemblies may be mounted on a lower adjustable frame, or on lower and upper adjustable frames.
  • individually adjustable back-up roller assemblies may be mounted on a lower adjustable frame, or on lower and upper adjustable frames.
  • the most economical and efficient configuration is to provide only a single set of back-up roller assemblies attached to one of the two frames of the leveling apparatus.
  • the back-up roller assemblies of the invention may be utilized in a leveling apparatus which lacks the intermediate back-up rolls which will be described for the preferred embodiment. However, this is less desirable since direct contact between the rollers of the back-up roller assemblies and the work rolls increases the tendency of the leveled strip to receive longitudinal markings which result from the localized pressure applied to the work rolls across the width of the strip.
  • the work rolls opposing the work rolls supported by the adjustable back-up roller assemblies are supported by fixed back-up roller assemblies positioned in direct, opposing relation to the adjustable back-up roller assemblies.
  • the leveling apparatus of the present invention includes a fixed base 12 which supports a fixed lower frame 14 and a vertically adjustable upper frame 16.
  • the upper frame 16 includes four corner columns 18 through which extend four jack screws 20 (only one of which is shown in Fig. 1) which are connected to the base by pivot connections 22 at their lower ends.
  • the four jack screws 20 each engage gear boxes 28, 30, 32 and 34, located on the tops of the four corner columns 18.
  • An electric motor 36 is drivingly coupled to a splitter gear box 38 which drives shafts 40, 42 that directly rotate gear boxes 28, 30, respectively.
  • a chain drive 44 connects gear box 28 to gear box 32, and a drive shaft 46 connects gear box 32 to gear box 34.
  • the single motor 36 simultaneously drives gear boxes 28-34 so that the upper frame 16 moves upwardly or downwardly along jack screws 20 in a uniform manner.
  • the lower frame 14 includes a mounting plate 48 on which is attached a plurality of fixed, lower back-up roller assemblies 50.
  • Each lower back-up roller assembly includes a lower support member 52 mounted on plate 48 and on which is rotatably mounted a plurality of lower back-up rollers, generally designated 54.
  • a plurality of lower intermediate back-up rolls 56 are supported by and nested between the lower back-up rollers 54. These rolls in turn support a plurality of lower work rolls 58 in nested relation.
  • the upper frame 16 includes a mounting plate 60 to which is attached a plurality of upper back-up roller assemblies 62.
  • Each back-up roller assembly 62 includes a back-up block 64 which is attached to the underside of the mounting plate 60 by bolts 66.
  • the back-up blocks 64 are elongate in shape and extend longitudinally of the leveling apparatus.
  • the back-up blocks 64 each define a longitudinal channel 68 which receives a support member 70.
  • the support members 70 are substantially coextensive of the elongate slots 68.
  • a plurality of back-up rollers 72 are rotatably mounted on stubs 74 which are pressed into the support member 70 so that the rollers are positioned on alternate sides of the support member. As best shown in Figs. 1 and 4, the upper back-up rollers 72 are nested against a plurality of upper intermediate back-up rolls 76. The intermediate back-up rolls 76 in turn are nested against a plurality of upper work rolls 78.
  • each lower work roll 58 includes a stub extension 84 which is connected to a drive shaft 86 by a universal joint 88.
  • the drive shafts 86 are connected by universal joints 90 to the output shafts 92 of a transmission 94.
  • the transmission 94 is driven by an electric motor (not shown).
  • the lower intermediate back-up rolls 56 are rotatably retained between lower side plates 80, 81 by well-known means (not shown).
  • each upper work roll 78 includes a stub extension 96 extending from one end which is connected by a universal joint 98 to an upper drive shaft 100.
  • Each upper drive shaft 100 is connected by a universal joint 102 to upper output shafts 104 of the transmission 94 (also shown in Fig. 2).
  • the upper and lower drive shafts 100, 86, respectively, and their associated universal joints are enclosed in a housing 106 which is mounted on an extension of the mounting plate 48.
  • the upper work rolls 76 are journaled into opposing upper side plates 82, 83 which are flexibly attached to mounting plate 60 to allow for vertical adjustment relative to the lower work rolls 58.
  • the ends of the upper intermediate back-up rolls 76 each include a recess 120 which receives a roller 122 having an axle 124 pressed into the end of the roll and a head 126.
  • Each head 126 is positioned adjacent to a thrust bearing 128 seated within the recess 120 and rotates against wear a plate 130 set into the upper side plates 82, 83.
  • the upper intermediate back-up rolls 76 also include such a roller bearing assembly to engage a wear plate (not shown) in upper side plates 82 and 83, identical to that shown in Fig. 6.
  • the intermediate back-up rolls 76 are capable of vertical movement in which the rollers 122 at both ends of each roll 76 slide and rotate against the wear plates 130, but are constrained with regard to movement along their longitudinal axes, or laterally of the leveling apparatus.
  • each support member 70 is attached to its respective back-up block 64 by a pair of resilient connections 132, located adjacent to forward and rearward ends of the member.
  • Each resilient connection 132 includes a shaft 134 threaded into the back-up block 64 at an upper end 136 and a lower diskshaped head 138.
  • the shaft 134 extends through a hole 140 which opens into a recess 142 in the support member 70.
  • a compression spring 144 is seated on the head 138 and is positioned to abut the end 146 of the recess.
  • the rearward portion of the back-up block 64 includes a downwardly-opening concave surface 146 and the rearward portion of the support member 70 includes an upwardly-extending convex portion 148, which is positioned to matingly engage and slide against the concave portion 146.
  • the convex portion 148 extends from the upper surface 150 of the support member sufficiently to provide a clearance space 151 between the support member 70 and the bottom 152 of the slot 68 to allow for pivotal movement of the support member relative to the back-up block 64, as indicated by broken line A in Fig. 4.
  • the concave portion 146 and convex portion 148 both have centers of curvature which coincide with the rotational axis 154 of the rearmost top work roll 156. Accordingly, both the concave portion 146 and convex portion 148 have a radius represented by line B , so that pivotal movement of the support member 70, which causes the convex portion 148 to slide against the concave portion 146, results in the support member 70 pivoting about the rotational axis 154 of the rearmost work roll 156.
  • Each upper back-up roller assembly 62 includes an adjusting screw mechanism 164, shown in Figs. 1, 2 and 3.
  • Each adjusting screw mechanism 164 includes a separate drive motor 166 which is drivingly connected to a gear box 168, both of which are mounted on the top plate 169.
  • Each gear box 168 receives the upper end of a jack screw 170 which extends downwardly through the upper frame 16 and mounting plate 60.
  • each jack screw 170 engages the upper one of a pair of spherical bearings 172, the lower one of which engages a removable pin 174 fitted within a bore 176 formed in the back-up block 64.
  • the lower end of each pin is connected to a second set of spherical bearings 178 which abut the upper surface 150 of the support member 70.
  • the spherical bearings 172, 178 provide a positive connection between the jack screw 170 and pin 174, and between the pin 174 and support member 70, throughout the range of pivotal movement of the support member, and to compensate for any misalignment between components.
  • the pins 174 facilitate the removal of replacement of the entire assembly attached to mounting plate 60 from the frame 16.
  • each adjusting screw mechanism 164 may be independently actuated to raise or lower its associated jack screw 170, to pos ition its back-up roller assembly 62.
  • a downward displacement of a jack screw 170 causes its associated support member 70 to pivot in a clockwise direction about axis 154, so that the penetration of the upper work rolls 78 (with the exception of the rearmost work roll 156) is increased.
  • An upward displacement of a jack screw 170 allows the resilient members 132 to pivot the support member 70 in a counterclockwise direction relative to back-up block 64 so that the penetration of the work rolls 78 is decreased.
  • the defect is that the length of the center of the strip is greater than at the edges, resulting in center buckle.
  • the support members 70 of the roller assemblies 62 immediately above the edges of the strip are deflected downwardly by their associated adjusting screw mechanisms 164 (Fig. 2), thereby increasing the penetration of the work rolls 78 in the region of the edge of the strip.
  • the operation of the leveling apparatus is as follows.
  • a strip of metal is fed into the leveling apparatus from right to left, as shown in Figs. 1 and 4, and extends between the upper and lower sets of work rolls 78, 58.
  • the upper frame 16 will be raised or lowered by the corner jack screws 20 to adjust the final penetration of the upper work rolls 78 into the lower work rolls 58.
  • a dividing line 182 extends between the upper and lower work rolls. Penetration is increased when the upper work rolls 78 are urged downwardly.
  • the individual adjusting screw mechanisms 164 are continuously actuated to pivot their respective support members 70 to vary the penetration of those portions of the upper work rolls 78 immediately below them, in order to correct for waves or buckles in the sheet 180 in those areas immediately below the specific upper back-up roller assemblies 62.
  • each adjusting screw 164 may be actuated by an operator, or by utilizing well-known sensor mechanisms, such as those disclosed in Buta U.S. Patent No. 4,454,738, the disclosure of which is incorporated herein by reference.
  • rollers 72 of the upper back-up roller assemblies 62, and the rollers 54 of the lower back-up roller assemblies 50 are not continuous rolls like intermediate back-up rolls 76, 56, there is a tendency for the strip 180 to receive longitudinal markings corresponding to the outer edges of the rollers.
  • two components of the leveling apparatus act to reduce the formation of such markings.
  • the preferred embodiment of the invention includes intermediate back-up rolls 76, 56 which are interposed between the rollers 72, 54 and the work rolls 78, 58, respectively.
  • the back-up rolls may be provided with spiral grooves which break up the pattern created by back-up rollers 54 and 72. It has been found that such an arrangement is effective in reducing the formation of longitudinal markings on the strip.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Soil Working Implements (AREA)

Claims (9)

  1. Machine à dresser du type comportant un bâti (12). un premier moyen de cadre (14) fixé audit bâti, un premier moyen de cylindre de travail (58) fixé audit premier moyen de cadre, un premier moyen (50 56) pour supporter ledit premier moyen de cylindre de travail fixé audit premier moyen de cadre, un second moyen de cadre (16) fixé audit bâti pour déplacement réglable verticalement par rapport audit premier moyen de cadre, un second moyen de cylindre de travail (78) fixé adjacent a et emboîté dans ledit premier moyen de cylindre de travail, et un second moyen (62) pour supporter ledit second moyen de cylindre de travail, un bloc d'appui (64) fixé audit second moyen de cadre (16) et comportant une portion concave s'étendant longitudinalement (146), un élément de support (70) ayant une portion convexe s'étendant longitudinalement (148) s'étendant vers l'extérieur a partir de celui-ci et placée pour engager de manière adaptée ladite portion concave, une pluralité de cylindres d'appui (72) fixés pour tourner audit élément de support et positionnés pour supporter ledit second moyen de cylindre de travail, un moyen (166, 170) pour faire pivoter ledit élément de support (70) par rapport audit bloc d'appui (64) d'une manière telle que ladite portion convexe (148) coulisse contre ladite portion concave (146), si bien que lesdits cylindres d'appui (72) sont poussés vers ou loin dudit second moyen de cylindre de travail (78) de sorte que ces cylindres de travail peuvent être sélectivement déformés ; caractérisé en ce que ladite portion concave (146) et ladite portion convexe (148) sont formées et situées d'une manière telle que les centres de courbure pour chacune desdites portions coïncident avec un axe de rotation (154) du cylindre de travail le plus en arrière (156) dudit second moyen de cylindre de travail (78), si bien que ledit cylindre de travail le plus en arrière n'est pas déformé par le pivotement dudit élément de support (70) par ledit moyen de pivotement.
  2. Machine à dresser selon la revendication 1, dans laquelle ladite portion concave (146) et ladite portion convexe (148) sont superposées audit cylindre de travail le plus en arrière (156).
  3. Machine à dresser selon la revendication 1 ou 2, dans laquelle ladite portion concave (148) s'étend vers l'extérieur depuis ledit élément de support (70) suffisamment pour séparer une surface supérieure (150) dudit élément de support d'une surface inférieure (152) dudit bloc d'appui (64) et forme un intervalle (151) entre elles afin de permettre un déplacement pivotant relatif dudit élément de support audit bloc d'appui.
  4. Machine à dresser selon l'une quelconque des revendications 1 à 3 comportant un moyen élastique (132) reliant ledit élément de support (70) audit bloc d'appui (64) aux extrémités avant et arrière de celui-ci, et un moyen de vis de réglage (164) monté sur ledit second moyen de cadre (16) et relié fonctionnellement audit élément de support (70).
  5. Machine à dresser selon la revendication 4, dans laquelle ledit bloc d'appui (75) est d'une forme allongée, s'étendant longitudinalement par rapport au second moyen de cadre, et comporte un canal central s'étendant longitudinalement (68), et ledit élément de support (70) est en forme de plaque et dimensionné pour s'adapter à l'intérieur dudit canal.
  6. Machine à dresser selon la revendication 5, dans laquelle lesdits cylindres d'appui (72) s'étendent le long dudit élément de support (70) et sont placés de manière alternée sur les côtés opposés de celui-ci.
  7. Machine à dresser selon les revendications 4, 5 ou 6, dans laquelle ledit moyen de vis de réglage (164) comporte un moteur (166) monté sur ledit second moyen de cadre, un moyen d'engrenage (168) entraîné par ledit moteur et un moyen de vis de montée (170) entraîné par ledit moyen d'engrenage et s'étendant à travers ledit bloc d'appui (64) pour engager ledit élément de support (70) à son extrémité avant.
  8. Machine à dresser selon l'une quelconque des revendications 1 à 7, dans laquelle ledit second moyen de support (62) comprend de plus une pluralité desdits blocs d'appui (64), lesdits éléments de support (70), lesdits cylindres d'appui (72) et ledit moyen de pivotement (64) formant ensemble une pluralité d'ensembles de cylindres d'appui (62) espacés à travers ledit second moyen de cadre et étant indépendamment réglables si bien que les cylindres de travail (76) dudit second moyen de cylindre de travail (78) peuvent être déformés à des emplacements prédéterminés sur la longueur dudit premier moyen de cylindre de travail (58).
  9. Machine à dresser selon la revendication 8, dans laquelle ledit second moyen de support (62) comporte une pluralité de cylindres d'appui intermédiaires (76) positionnés en relation emboîtée avec ledit second moyen de cylindre de travail (78), lesdits cylindres d'appui (72) étant positionnés pour contacter lesdits cylindres d'appui intermédiaires.
EP19860307236 1985-04-24 1986-09-19 Machine à dresser Expired - Lifetime EP0260361B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US06/726,542 US4635458A (en) 1985-04-24 1985-04-24 Leveling apparatus
EP19860307236 EP0260361B1 (fr) 1986-09-19 1986-09-19 Machine à dresser
DE8686307236T DE3684919D1 (de) 1986-09-19 1986-09-19 Richtmaschine.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19860307236 EP0260361B1 (fr) 1986-09-19 1986-09-19 Machine à dresser

Publications (3)

Publication Number Publication Date
EP0260361A2 EP0260361A2 (fr) 1988-03-23
EP0260361A3 EP0260361A3 (en) 1988-06-08
EP0260361B1 true EP0260361B1 (fr) 1992-04-15

Family

ID=8196149

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860307236 Expired - Lifetime EP0260361B1 (fr) 1985-04-24 1986-09-19 Machine à dresser

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EP (1) EP0260361B1 (fr)
DE (1) DE3684919D1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3823675A1 (de) * 1988-07-13 1990-01-18 Dornier Gmbh Einrichtung zum biegeumformen oder richten von werkstuecken durch plastische formaenderung
DE4308744A1 (de) * 1993-03-19 1994-09-22 Schloemann Siemag Ag Richtmaschine, insbesondere zum Richten von Blechen und Bändern
GB0404022D0 (en) * 2004-02-17 2004-03-31 Bronx Mfg Company Uk The Ltd Levelling machine and method
CN110227739A (zh) * 2019-07-25 2019-09-13 济南艺高数控机械有限公司 快速换辊校平机

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2827945A (en) * 1949-07-28 1958-03-25 Frederick K Maust Roller leveler with upper-roller adjusting means
US2963071A (en) * 1957-03-15 1960-12-06 Lake Erie Machinery Corp Leveler for sheet metal strips
DE1988614U (de) * 1963-11-29 1968-07-04 Siemag Siegener Masch Bau Blechrichtmaschine mit in einem gestell gegeneinander anstellbaren richtwalzen.
US3301031A (en) * 1964-06-23 1967-01-31 Voss Engineering Company Roller leveler
US3420082A (en) * 1966-06-02 1969-01-07 Wilson Eng Co Inc Lee Leveler
DE1752211C3 (de) * 1968-04-20 1975-10-09 Wilhelmsburger Maschinenfabrik, Hinrichs & Sohn, 2054 Geesthacht Feinblechrichtmaschine
US4454738A (en) * 1981-06-29 1984-06-19 The Paxson Machine Company Roller leveler and method of operating same

Also Published As

Publication number Publication date
DE3684919D1 (de) 1992-05-21
EP0260361A2 (fr) 1988-03-23
EP0260361A3 (en) 1988-06-08

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