EP0757927B1 - Dispositif pour le contrôle de pièces - Google Patents

Dispositif pour le contrôle de pièces Download PDF

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Publication number
EP0757927B1
EP0757927B1 EP96112336A EP96112336A EP0757927B1 EP 0757927 B1 EP0757927 B1 EP 0757927B1 EP 96112336 A EP96112336 A EP 96112336A EP 96112336 A EP96112336 A EP 96112336A EP 0757927 B1 EP0757927 B1 EP 0757927B1
Authority
EP
European Patent Office
Prior art keywords
rocker
proximity switches
sheet
measuring
workpiece
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
EP96112336A
Other languages
German (de)
English (en)
Other versions
EP0757927A1 (fr
Inventor
Gebhard Hirscher
Ulrich Dipl.-Ing. Schöntauf
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.)
Mueller Weingarten AG
Original Assignee
Mueller Weingarten AG
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 Mueller Weingarten AG filed Critical Mueller Weingarten AG
Publication of EP0757927A1 publication Critical patent/EP0757927A1/fr
Application granted granted Critical
Publication of EP0757927B1 publication Critical patent/EP0757927B1/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
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
    • 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
    • B21D43/24—Devices for removing sheets from a stack
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
    • B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
    • B65H7/06—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed
    • B65H7/12—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed responsive to double feed or separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/10—Size; Dimensions
    • B65H2511/13—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/20—Location in space
    • B65H2511/21—Angle
    • B65H2511/212—Rotary position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/50—Occurence
    • B65H2511/52—Defective operating conditions
    • B65H2511/524—Multiple articles, e.g. double feed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2553/00—Sensing or detecting means
    • B65H2553/60—Details of intermediate means between the sensing means and the element to be sensed
    • B65H2553/61—Mechanical means, e.g. contact arms

Definitions

  • the invention relates to a device for controlling Workpieces and especially for the detection of double sheets with a sheet feeding device of a press or the like according to the preamble of claim 1.
  • the sheets are pressed from a sheet stack for example by means of a feeder with suction devices, also called suction spider, from a stack of sheet metal blanks lifted off and fed to the processing machine. It must be ensured that the processing machine always only a single sheet and not several superimposed Sheets, so-called "double sheets" are fed.
  • the Inserting a double sheet into a machine tool and especially in a press can destroy the tool to lead.
  • the mounting of double sheets can be different Have causes. In particular, this can be done by Adhesive forces by oil or the like between the levels Sheets are created. Furthermore, in particular also with a magnetic lifting of the sheet a double shot respectively.
  • DE-U 92 10 560 is a device for double sheet control for feeding devices on presses become known, which has a measuring head with a U-shaped Has fork, between which the board stack lifted sheet is inserted and the thickness of the sheet is recorded becomes. If a double sheet is available, it leaves one certain sheet thickness set gap an insertion of the measuring sheet no longer, so that the entire device axially shifted and an error signal is reported.
  • the invention has for its object these disadvantages to avoid known devices and in particular a To provide a device for detecting double sheets, which is extremely simple and broad works insensitive to any interference. Furthermore, the device should be without retrofitting for various sheet thicknesses can be used.
  • the invention is based on the main idea that a continuous measuring process without disturbing downtimes are only possible to carry out the control process, if the running workpiece is in motion is measured. This is mechanically very simple detection achieved by moving the workpiece along a pivotable rocker is guided, the pivoting movement is in particular electronically detectable. Arrived Double sheet through the measuring gap of the rocker, so the increased Deflection recorded by measurement and as an error message spent. Likewise, a non-loading of the Measuring device in a certain cycle sequence for a "zero workpiece" cause what will be output as an error message can.
  • the device therefore, is particularly simple Way between three different states of the Differentiated sheet feeder, namely "no sheet” or properly “a sheet” or incorrectly one "Double sheet".
  • the device thus contributes to a proper sheet feed for a press.
  • the rocker mounted on one side a movable roller or measuring roller with a counter role assigned to it to a gap or to form a measuring gap for the thickness of the workpiece, wherein the pivoting movement of the movable measuring roller on the rocker is electronically detectable.
  • this detection is carried out by several Proximity switches, the damping sequence of which is a measure of the Workpiece thickness, i.e. a measure of the resulting measuring gap represents.
  • the number of proximity switches used can be any technically reasonable thickness range without Measure retrofitting.
  • Means may be provided, e.g. an optical ruler, a Resistance track or the like.
  • the swiveling rocker is in its starting position expediently by a fixed stop in their Starting position defined to make the deflection angle reproducible capture.
  • the rocker can be in the range of Proximity switches are preferably stepped his.
  • the overall system 1 shown in FIG. 1 is used for Picking up and transporting a workpiece 2 for example of a sheet to be processed from a sheet metal or Board stack 3 and its transfer to a conveyor belt 4 for Further transport to a board transfer station 5 with a Lifting and lowering station 6.
  • the lifting and lowering station takes over the transported board from the conveyor or conveyor belt 4. From there, the transport facilities of the press take over e.g. the sucker bars of a heat press do that too processing sheet metal and lead this to the processing station to.
  • the system 1 has a to carry out a sheet inspection Sheet metal inspection device 7, by which according to the 1 shows a workpiece or sheet metal 2 is continuously promoted. Recognize that Sheet control device a double sheet, so the Sheets are deposited at the double sheet unloading station 8.
  • the sheet inspection device 7 is as well shown in Fig. 1 as a rocker 9, which at one end in a pivot point 10 is mounted stationary.
  • a measuring roller 11 the rocker 9 registers the workpiece 2 caused deflection or pivoting of the rocker 9, a series of proximity switches 12 from corresponding measuring surfaces 13 on the rocker 9 are activated can.
  • a selection logic 14 evaluates in a special Matrix according to the representation of Fig. 4a, 4b Damping sequence of the proximity switch 12, one Relay logic controller 15 with those in the PLC controller 16 stored tool sets the different Tool thicknesses compared and evaluated.
  • On Proximity switch 29 detects the impact of the workpiece in the control device 7 and after release signal Filtering the signal bouncing 17 will control the Workpiece activated.
  • the proximity switch 29 is arranged horizontally adjustable be (see arrow). This can control the Workpieces also released in precisely defined areas become what e.g. for workpieces with a cut Inner contour is important.
  • FIG. 3a in side view and FIG. 3b in top view is the sheet metal inspection device 7, which was only roughly indicated previously shown in more detail, wherein Fig. 3a is a side view or shows a section along the section line A-A in Fig. 3b. 3a shows the starting position of the Sheet metal inspection device 7 without a retracted workpiece 2, while Fig. 3c the same device in principle retracted workpiece 2 shows.
  • the rocker 9 is again shown in FIGS. 3a to 3c shown at a fulcrum 10 by means of a bolt 18 is mounted in a fixed frame 19.
  • a Compression spring 10 presses the rocker 9 against a fixed stop 21 as long as no sheet is running through the measuring device.
  • a measuring gap 24 with a Measuring gap width s which in its initial position according to FIG. 3a is designated as s1.
  • the measuring gap s1 is through the optionally adjustable stop 21 is determined.
  • the Rocker 9 therefore lifts from the stop 21 against the pressure of the Compression spring 20 off.
  • a series of proximity switches 12 are provided which are designated by reference numerals 25 to 28.
  • the Proximity switches are fixed in the two side ones Frame 19, 19 'arranged in a defined position.
  • the Rocker in this area fork-shaped (reference number 30) formed to form measuring surfaces 31, 32.
  • FIGS. 3a to 3d shows an assignment of the measuring ranges of the sheet thicknesses for each proximity switch 25 to 28.
  • This Assignment happens through the different gradation of the Measuring surfaces b1 to b4 on the two measuring surfaces 31, 32. This is shown symbolically in FIGS. 3a to 3d.
  • Fig. 4a shows a further measuring range (V) from one Sheet thickness ranges from 1.8 to 2.9 mm. This can be done through a Double assignment of the proximity switch 26 made become.
  • the measuring surface is b2, for example for the proximity switch 26 by means of a bore 33 recessed, whereby two measuring surface areas are formed.
  • the areas X1 in FIG. 4b accordingly show the proper condition, the areas X2 in Fig. 4b that Presence of a "double sheet".
  • the proximity switch is consequently determined via stored values whether no sheet, a Sheet or several sheets (double sheet) over the measuring roller 11 is driven.
  • the PLCs are assigned to the Tool sets the different sheet thicknesses and the corresponding belonging measuring proximity switch.
  • the device according to the invention also has the Advantage that each of the four proximity switches during each Cycle in the first part of the pivoting movement of the rocker 9 its function can be tested so that a constant Control of operational security takes place.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)

Claims (10)

  1. Dispositif pour le contrôle de pièces et, en particulier, pour la reconnaissance de tôles doubles dans un dispositif d'amenée de tôles pour une presse ou analogue, la pièce pouvant être amenée à un dispositif de mesure (1) et le dispositif de mesure (1) comportant une bascule (9) pouvant pivoter, dont la déviation est effectuée de façon dépendant de l'épaisseur de la pièce, la mesure de la déviation pouvant être déterminée de façon électronique et exploitée dans le sens d'une évaluation « bon-mauvais »,
    caractérisé en ce que la bascule (9) est réalisée dans la zone de commutateurs de proximité (12, 25 à 28) de sorte que sont formées des surfaces de mesure (b1 à b4) qui, selon la déviation de la bascule, actionnent les commutateurs de proximité (25 à 28).
  2. Dispositif selon la revendication 1,
    caractérisé en ce qu'une bascule (9) montée d'un côté présente, à une distance « a » du pivot (10), un galet (11) qui forme avec une contre-surface fixe et, en particulier, un contre-galet fixe (23), une fente (24) pour l'épaisseur de la pièce (2) transportée à travers la fente, et en ce qu'une déviation ou un pivotement correspondant de la bascule, du fait de l'épaisseur de la pièce, peut être déterminé et exploité de façon électronique.
  3. Dispositif selon la revendication 1 ou 2,
    caractérisé en ce que la déviation de la bascule (9) peut être détectée par l'intermédiaire d'au moins un et en particulier deux ou plusieurs commutateurs de proximité (12), dont la succession des atténuations est déterminée par des surfaces de mesure (13 ; 31, 32 ; b1 à b4) sur la bascule et représente une mesure pour l'évaluation de l'épaisseur de la pièce.
  4. Dispositif selon une des revendications précédentes,
    caractérisé en ce que la bascule (9), dans la position de référence sans pièce, est supportée contre une butée fixe (21) et la déviation est effectuée à l'encontre de la force d'un ressort de pression (20).
  5. Dispositif selon une des revendications précédentes,
    caractérisé en ce que la bascule (9), dans la zone des commutateurs de proximité (25 à 28), est réalisée de façon étagée pour former des surfaces de mesure (b1 à b4) qui, selon la déviation de la bascule, permettent une atténuation des commutateurs de proximité (25 à 28).
  6. Dispositif selon une des revendications précédentes,
    caractérisé en ce qu'il est prévu un circuit électronique d'exploitation, qui, aux commutateurs de proximité (25 à 28), associe des zones d'épaisseur de tôle déterminées, l'atténuation des commutateurs de proximité pouvant être exploitée dans une logique de sélection.
  7. Dispositif selon une des revendications précédentes,
    caractérisé en ce que, dans la zone du galet (11), il est prévu un transmetteur de signaux (29) pouvant être avantageusement déplacé horizontalement, qui détecte l'entrée de la pièce (2) dans le dispositif de mesure (1) et l'amène à un dispositif de mesure et de commande (15,17), et en ce que le processus de mesure est effectué après affaiblissement des oscillations.
  8. Dispositif selon une des revendications précédentes,
    caractérisé en ce que la logique de sélection des commutateurs de proximité (12 ; 25 à 28) est effectuée de façon dépendant des épaisseurs des pièces amenées (d), une atténuation ou une non-atténuation des commutateurs de proximité choisis entraínant une bonne évaluation (X1) ou une mauvaise évaluation (X2).
  9. Dispositif selon une des revendications précédentes,
    caractérisé en ce que le nombre des commutateurs de proximité (12) et/ou le nombre des surfaces (13 ; 31, 32 ; b1 à b4) activant les commutateurs de proximité permettent un élargissement quelconque de la plage de mesure.
  10. Dispositif selon une des revendications précédentes,
    caractérisé en ce que les commutateurs de proximité (12, 25 à 28, 29) subissent, avant le processus de mesure proprement dit, un contrôle de fonctionnement.
EP96112336A 1995-08-05 1996-07-31 Dispositif pour le contrôle de pièces Expired - Lifetime EP0757927B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19528811A DE19528811A1 (de) 1995-08-05 1995-08-05 Vorrichtung zur Kontrolle von Werkstücken
DE19528811 1995-08-05

Publications (2)

Publication Number Publication Date
EP0757927A1 EP0757927A1 (fr) 1997-02-12
EP0757927B1 true EP0757927B1 (fr) 2000-02-16

Family

ID=7768779

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96112336A Expired - Lifetime EP0757927B1 (fr) 1995-08-05 1996-07-31 Dispositif pour le contrôle de pièces

Country Status (3)

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EP (1) EP0757927B1 (fr)
DE (2) DE19528811A1 (fr)
ES (1) ES2143690T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19941037C1 (de) * 1999-08-28 2001-01-04 Wilfried Strothmann Gmbh & Co Positionierungsförderer zum horizontalen Ausrichten von Platten

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2832058A1 (de) * 1978-07-21 1980-01-31 Sack Gmbh Vorrichtung zum abheben von einzelnen blechen von einem blechstapel
WO1982001698A1 (fr) * 1980-11-07 1982-05-27 Tee Victor G Appareil de detection de l'epaisseur de feuilles
JPS62147641U (fr) * 1986-03-11 1987-09-18
IT1206844B (it) * 1987-01-16 1989-05-11 Prima Ind Spa Metalliche da una pila metodo per la separazione di lastre
DE3823201A1 (de) * 1988-07-08 1988-12-08 Mabeg Maschinenbau Gmbh Nachf Mehrfachbogenkontrollvorrichtung
DE4202379A1 (de) * 1992-01-29 1993-08-05 Nsm Magnettechnik Gmbh Verfahren und einrichtung zum entstapeln von blechstapeln, insbesondere zur beschickung von pressen
DE9210560U1 (de) * 1992-08-07 1992-10-01 Automatisierungs- und Kunststofftechnik GmbH Chemnitz, 09120 Chemnitz Gerät zur Doppelblechkontrolle für Zuführeinrichtungen an Pressen
US5437445A (en) * 1992-10-08 1995-08-01 Pitney Bowes Inc. Method and apparatus for detecting double fed sheets
DE4322963C2 (de) * 1993-07-09 1999-07-22 Mueller Weingarten Maschf Verfahren sowie Vorrichtung zur Kontrolle von Werkstücken

Also Published As

Publication number Publication date
DE19528811A1 (de) 1997-02-06
ES2143690T3 (es) 2000-05-16
DE59604454D1 (de) 2000-03-23
EP0757927A1 (fr) 1997-02-12

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