EP0340065B1 - Verfahren und Einrichtung zum Stapeln von mit einer Schere produzierten Blechen, insbesondere aus einem Blechband - Google Patents

Verfahren und Einrichtung zum Stapeln von mit einer Schere produzierten Blechen, insbesondere aus einem Blechband Download PDF

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Publication number
EP0340065B1
EP0340065B1 EP19890400997 EP89400997A EP0340065B1 EP 0340065 B1 EP0340065 B1 EP 0340065B1 EP 19890400997 EP19890400997 EP 19890400997 EP 89400997 A EP89400997 A EP 89400997A EP 0340065 B1 EP0340065 B1 EP 0340065B1
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EP
European Patent Office
Prior art keywords
conveyor
blanks
stops
cutting machine
blank
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
EP19890400997
Other languages
English (en)
French (fr)
Other versions
EP0340065A1 (de
Inventor
Jacques Blondel
Joel Havez
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.)
DUJARDIN MONTBARD SOMENOR
Original Assignee
DUJARDIN MONTBARD SOMENOR
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Publication date
Application filed by DUJARDIN MONTBARD SOMENOR filed Critical DUJARDIN MONTBARD SOMENOR
Publication of EP0340065A1 publication Critical patent/EP0340065A1/de
Application granted granted Critical
Publication of EP0340065B1 publication Critical patent/EP0340065B1/de
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/16—Delivering or advancing articles from machines; Advancing articles to or into piles by contact of one face only with moving tapes, bands, or chains
    • 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
    • B21D43/20—Storage arrangements; Piling or unpiling
    • B21D43/22—Devices for piling sheets
    • 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
    • B21D43/28—Associations of cutting devices therewith
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/26—Delivering or advancing articles from machines; Advancing articles to or into piles by dropping the articles
    • B65H29/30—Delivering or advancing articles from machines; Advancing articles to or into piles by dropping the articles from magnetic holders

Definitions

  • the present invention relates to installations for cutting blanks from a strip, in particular a sheet metal strip, by means of a shear or a press, and relates more particularly to the means for stacking these blanks with the output from the cutting machine.
  • the blanks leaving the cutting machine are brought to the stacking device either by gravity, by sliding on an inclined plane, or by means of a continuous conveyor, for example a magnetic belt conveyor which releases the blanks. in flight over the stacker.
  • the blanks are stopped by stops of the stacking device which allow, with lateral guides, to correctly position the blanks so that they can be stacked.
  • the friction of blanks on the conveyors and the shocks against the stops and guides may cause unacceptable damage.
  • Document DE-A-1 815 651 relates to such an installation for stacking sheets cut by shears. It describes a device comprising a first endless belt conveyor whose upper strand is located at the level of the shear table, and a second endless belt conveyor whose upstream end extends above half downstream of the first conveyor, so that its lower strand is at a short distance from the upper strand of the first conveyor and moves in the same direction, and which is provided with electromagnets allowing to plate the sheets under the lower strand and keep them there for transport to the stacking device.
  • the two conveyors have an intermittent operation, at the same rate as the shears, and their speed is equal to the speed of supply of the sheet to the shears.
  • the part of the second conveyor located above the stacking device is devoid of electromagnets or, if there are any, they are not powered; the sheets are projected onto the pile by the speed acquired and strike a stop. According to another operating mode, the second conveyor is in continuous operation.
  • the aim of the present invention is to reduce the friction of the blanks on the conveyors, guides and stops, to avoid scratches on the blanks and the deterioration of the belts and to suppress impacts against the guides and stops to avoid "stamping" on the blanks, which will achieve the "zero defect" objective or at least achieve a significant gain by avoiding retouching.
  • the invention also makes it possible to suppress the noise originating from the impacts of the blanks arriving at high speed in conventional inertia stackers, to increase staff safety and increase productivity thanks to the automatic adjustment of all parameters: rate, positions of guides and stops, etc. from an introduced "part code" by an operator.
  • the blanks are transported from the cutting machine to the stacking device by means of a cyclic conveyor whose rate is the same as that of the cutting machine and whose pitch is equal to one submultiple of the distance separating the cutting machine from the stacking device, and the blanks of the conveyor are transferred to the stacking device when the conveyor is stopped.
  • the pitch of the conveyor is determined as a function of the longitudinal dimension, measured in the direction of movement, of the blanks. The difference between the pitch and this dimension of the blanks corresponds to the spacing between two successive blanks on the conveyor.
  • said conveyor is switched on, at each cycle, before the device for feeding the cutting machine, the instant of starting of the conveyor and the variation as a function of time of its speed being chosen so that that the distance traveled by said conveyor when the blank leaving the cutting machine is loaded on the conveyor is equal to the desired spacing between the blanks.
  • the characteristics of the first part of the conveyor's walking cycle are chosen so that its speed is equal to that of the feeder of the cutting machine when the blank leaving the machine is taken over by the conveyor ; from this instant and until the end of the cycle the speeds of the conveyor and of the feeding device of the cutting machine are maintained equal.
  • an endless belt conveyor may be used, the ends of which extend, respectively, above the output table of the cutting machine and above the stacking device. and comprising electromagnetic or pneumatic means making it possible to press the blanks under the lower strand of the strip and to keep them there over the entire path of the conveyor, these means being able to be made inactive to allow the blanks to fall onto the stacking device.
  • the conveyor will be controlled by an automaton according to a program developed by a computer from data, entered by an operator, relating to the dimensions and the shape of the blanks and according to the cycle of the cutting machine.
  • the positioning of the guides and stops of the stacking device will be automated and controlled by the computer.
  • the conveyor is formed of two parallel bands placed side by side and whose head drums can be moved individually in the longitudinal direction, to adapt to a cutting plane of the cutting machine making an angle other than 90 ° with the direction of movement of the blanks.
  • FIGS. 1 and 2 The installation shown in FIGS. 1 and 2 consists essentially of an endless belt conveyor 10 and a stacking device 12.
  • the conveyor 10 comprises a chassis 14 which is mounted on horizontal slides allowing its movement longitudinal. These slides are fixed, on the one hand, to the frame of the cutting machine 16 and, on the other hand, to the chassis of the stacking device. The conveyor can be moved on these slides by means of screw jacks interposed between the chassis of the stacking device and the adjacent end of the chassis 14.
  • Two endless belts 18 are mounted side by side on the frame 14 and are stretched between head drums 20 and 22, the drum 20 adjacent to the stacking device being driven by a variable speed motor.
  • the lower strand of these bands which is horizontal, slides on the underside of non-magnetic stainless steel soles, above which magnets are placed.
  • the end of the conveyor overhangs the output table of the machine 16, the lower strands of the bands being a short distance from the table, so that the blanks leaving the machine are attracted by the magnets and pressed under the bands.
  • the magnets located in the first part of the conveyor, between the machine 16 and the stacking device can be permanent magnets or electromagnets. Above the stacking device, the conveyor is equipped with electromagnets which can be de-energized to drop the blanks on the stack being formed in the device.
  • the inside of the strips is smooth to facilitate sliding on the floors while their outside is striated to facilitate the fall of the blanks.
  • the head drum 22, adjacent to the machine 16, of at least one of the bands can be moved, by means of a jack, relative to the chassis of the conveyor, to modify the relative useful lengths of the two bands and allow better taking blanks whose front edge is biased (blanks in the shape of a triangle or trapezoid).
  • the stacking device comprises a raised frame 24 located below the conveyor 10, a short distance from the lower strand of the strips.
  • This frame carries front and rear stops 26 and 28 and lateral guides which are linked to the frame 24 by jacks making it possible to move them horizontally to adapt their positions to the dimensions of the blanks; these jacks also allow the stops 26 and 28 to be oriented in a horizontal plane.
  • the stacking device further comprises a lifting table 32 and two self-driving carriages 34 movable on rails 36 and each carrying a motorized roller tray 38 intended to receive the pallet 40.
  • the carriages are constituted by a frame on wheels with inside which the tray of the lifting table can pass so that it is possible to lift the tray 38 and the pallet which it carries, without lifting the carriage.
  • the carriages can be moved back and forth between the stacking device and two positions located on either side of it and for which the roller plates 38 are aligned with conveyors serving to bring the empty pallets and to evacuate the full pallets.
  • An indexing device is provided on the lifting table to correctly position the pallets according to the positions of the stops 26 and 28 and the lateral guides. A rotation of the pallet is also possible to obtain different positions of the blanks on the latter.
  • the machine 16 is equipped with a conventional feeding device bringing a sheet metal strip step by step under the tool of the machine, the advance being made between two cuts, at a predetermined rate.
  • the operation of the conveyor 10 is cyclical and its period is the same as that of the device for feeding the sheet metal to the machine 16. It is controlled by an automaton 42 according to a program preset by a computer 44 as a function of the dimensions of the blanks 30 and of the operating cycle of the device for supplying the sheets to the machine 16. Before the machine 16 starts, the computer 44 also determines, as a function of the same parameters, the positions of the stops 26 and 28 and of the lateral guides and control moving them to bring them into these positions.
  • Figure 3 shows the variations over time speeds of the device for feeding the sheet metal to the machine 16 (upper curve) and of the conveyor 10 (lower curve).
  • one of the objects of the invention is to be able to drop the blanks above the stacking device with zero speed so as to avoid impacts against the stops.
  • the pitch of the conveyor 10 is a submultiple of the distance separating the machine 16 from the stacking device or more precisely the distance between the front stop 26 of the stacking device and the front edge of the last blank out of the machine 16.
  • This pitch as well as the position of the stops 26 and 28 are determined by the computer 44 as a function of the length of the blanks. It is greater than the pitch of the device for feeding the sheet metal to the machine 16, which means that the blanks will be spaced apart longitudinally from one another on the conveyor.
  • the conveyor 10 starts (instant A) before the device for feeding the sheet metal to the machine 16, either at the end of cutting as in the example in FIG. 3, or with a certain delay .
  • the speed of the conveyor increases to the value V1 with a constant acceleration equal to that of the feeding device.
  • V1 is the speed of the feed device when the blank leaving the machine 16 is gripped by the transporter. The blank cannot be entered by the transporter only after it has been pushed a certain distance out of the machine by the feeding device; it is then driven by speed V1.
  • the speed of the conveyor 10 is then kept constant until the supply device reaches speed V1 (instant B), so that the blank and the conveyor have the same speed when the first is taken over by the second. From this moment, the conveyor 10 and the feed device move in synchronism until the stop. Before the conveyor 10 has completely stopped, the electromagnets placed above the stacking device are de-energized so that, given their hysteresis, the force of attraction exerted on the blank is canceled out when it is located above this device. The blank is then perfectly centered relative to the stops 26 and 28 and its speed is zero so that it falls on the stack supported by the pallet without hitting the stops.
  • the computer 44 also controls, via a programmable controller, the movements of the lifting table 32 and the carriages 34 of the stacking device.
  • the speed of the conveyor 10 is measured by means of two pulse generators placed, respectively, on the motor drum 20 and on an idler roller in contact with the strips; by comparing the indications of the two generators, we can detect the sliding of the bands on the drum and correct the speed of the conveyor to maintain a constant pitch.
  • the conveyor 10 and the cutting machine 16 are arranged in line.
  • the conveyor could however form any angle with the direction of travel of the sheet metal strip in the cutting machine, which could be equipped with a blank removal device.
  • the conveyor could be formed of several elements arranged in line or forming between them any angle.
  • a pneumatic system may be used to apply the blanks to the conveyor belts which must be permeable.
  • Other types of known carriers could moreover be used for the implementation of the invention. It is understood that these modifications are within the scope of the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Pile Receivers (AREA)
  • Making Paper Articles (AREA)
  • Discharge By Other Means (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)

Claims (4)

  1. Anlage zum Stapeln von Platinen (30) am Auslauf einer Schneidmaschine (16), bestehend aus einer Stapelvorrichtung (12), ausgerüstet mit einem Hubtisch (32) und einem vorderen Anschlag (26), welcher den Bereich begrenzt, in dem die Platinen (30) gestapelt werden sollen, und einem zyklisch laufenden Förderer (10), dessen Betriebstakt gleich dem der Beschickungsvorrichtung der Schneidmaschine (16) ist, welcher vor der Beschickungsvorrichtung anläuft, und der dieselbe Geschwindigkeit (V1) wie letztere hat, wenn die aus der Schneidmaschine (16) auslaufende Platine (30) vom Förderer (10) erfaßt wird, dadurch gekennzeichnet, daß sie darüberhinaus einen hinteren Anschlag (28) umfaßt, Mittel (Winden) zur Einstellung der Position besagter Anschläge (26, 28), einen Motor mit veränderlicher Drehzahl zum Antrieb besagten Förderers (10), Mittel (44) zur Bestimmung des Schritts des Förderers (10) sowie der Position der Anschläge (26, 28) aufgrund der Abmessungen der Platinen (30), sodaß dieser Schritt gleich einem in dem Abstand zwischen dem vorderen Anschlag (26) und der Vorderkante der letzten aus der Schneidmaschine (16) ausgelaufenen Platine (30) aufgehenden Bruchteil ist, sowie Mittel (42) zur Steuerung der Einstellmittel der Anschläge (26, 28) und zur Steuerung des Motors des Förderers (10), damit sich der Förderer (10) ab dem Zeitpunkt, an dem die aus der Schneidmaschine (16) auslaufende Platine (30) vom Förderer (10) erfaßt wird, bis zum Stillstand besagten Beschickungssystems synchron mit der Beschickungsvorrichtung der Schneidmaschine (16) bewegt, sodaß sich bei jedem Anhalten des Förderers (10) eine Platine (30) über der Stapelvorrichtung (12) genau über dem von besagten Anschlägen (26, 28) abgegrenzten Bereich befindet.
  2. Anlage gemäß Anspruch 1, dadurch gekennzeichnet, daß es sich bei besagtem Förderer (10) um einen Förderer mit endlosem Gurt handelt, der mit elektromagnetischen oder pneumatischen Mitteln (27) versehen ist, die die Platinen (30) anziehen und sie während des gesamten Weges des Förderers (10) unter dem Untertrum des Gurts (18) halten, wobei diese Mittel unwirksam gemacht werden können, um das Abfallen der Platinen (30) auf die Stapelvorrichtung (12) zu gestatten.
  3. Anlage gemäß Anspruch 2, dadurch gekennzeichnet, daß besagter Förderer (10) zwei parallele nebeneinander angeordnete Gurte umfaßt, deren Kopftrommeln zweck Anpassung an die Form der Platinen (30) in Längsrichtung zueinander verstellt werden können.
  4. Anlage gemäß Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß besagter Förderer (10) in Gleitschienen montiert ist, die seine Längsverstellung ermöglichen.
EP19890400997 1988-04-27 1989-04-12 Verfahren und Einrichtung zum Stapeln von mit einer Schere produzierten Blechen, insbesondere aus einem Blechband Expired - Lifetime EP0340065B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8805599A FR2630669B1 (fr) 1988-04-27 1988-04-27 Procede et installation pour l'empilage de flancs produits par une machine de decoupage, notamment a partir d'une bande de tole
FR8805599 1988-04-27

Publications (2)

Publication Number Publication Date
EP0340065A1 EP0340065A1 (de) 1989-11-02
EP0340065B1 true EP0340065B1 (de) 1993-03-31

Family

ID=9365737

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890400997 Expired - Lifetime EP0340065B1 (de) 1988-04-27 1989-04-12 Verfahren und Einrichtung zum Stapeln von mit einer Schere produzierten Blechen, insbesondere aus einem Blechband

Country Status (4)

Country Link
EP (1) EP0340065B1 (de)
DE (1) DE68905648T2 (de)
ES (1) ES2039889T3 (de)
FR (1) FR2630669B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2690637A1 (fr) * 1992-04-29 1993-11-05 Dujardin Montbard Somenor Installation de manutention pour le transport de flans d'une machine de découpage à un dispositif d'empilage.
NL9200883A (nl) * 1992-05-20 1993-12-16 Walker Hagou Bv Werkwijze voor het knippen en stapelen van metaalplaten.
CN113878052B (zh) * 2021-09-28 2023-06-20 河南永通铝业有限公司 带有自动收料机构的圆形铝板自动冲压装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1815651A1 (de) * 1968-12-19 1970-07-09 Siemag Maschinen U Stahlbau Ne Vorrichtung zum Stapeln von Blechen auf einem Hubtisch
DE3151208C2 (de) * 1981-12-23 1986-11-27 Siemens AG, 1000 Berlin und 8000 München Vorrichtung zum Entnehmen ferromagnetischer Blechplatinen aus Blechbearbeitungsmaschinen

Also Published As

Publication number Publication date
DE68905648T2 (de) 1993-07-29
FR2630669B1 (fr) 1993-01-22
EP0340065A1 (de) 1989-11-02
FR2630669A1 (fr) 1989-11-03
ES2039889T3 (es) 1993-10-01
DE68905648D1 (de) 1993-05-06

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