EP1403202B1 - Procédé d'opération d'un détecteur pour la détection des feuilles dans une machine de traitement de feuilles - Google Patents

Procédé d'opération d'un détecteur pour la détection des feuilles dans une machine de traitement de feuilles Download PDF

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Publication number
EP1403202B1
EP1403202B1 EP20020021524 EP02021524A EP1403202B1 EP 1403202 B1 EP1403202 B1 EP 1403202B1 EP 20020021524 EP20020021524 EP 20020021524 EP 02021524 A EP02021524 A EP 02021524A EP 1403202 B1 EP1403202 B1 EP 1403202B1
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EP
European Patent Office
Prior art keywords
sensor
sheets
sheet
detection
signal level
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
EP20020021524
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German (de)
English (en)
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EP1403202A1 (fr
Inventor
Rolf Banschbach
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.)
Leuze Electronic GmbH and Co KG
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Leuze Electronic GmbH and Co KG
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Priority to DE50205040T priority Critical patent/DE50205040D1/de
Priority to EP20020021524 priority patent/EP1403202B1/fr
Publication of EP1403202A1 publication Critical patent/EP1403202A1/fr
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    • 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
    • B65H7/125—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 sensing the double feed or separation without contacting the articles
    • 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
    • B65H2511/30—Numbers, e.g. of windings or rotations
    • 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
    • B65H2553/20—Sensing or detecting means using electric elements
    • B65H2553/23—Capacitive detectors, e.g. electrode arrangements
    • 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
    • B65H2553/30—Sensing or detecting means using acoustic or ultrasonic elements

Definitions

  • the invention relates to a method for operating a sensor for detection of sheets in a sheet-processing machine.
  • DE 200 18 193 describes a device for controlling sheets in a sheet processing machine with at least one of the sheets detecting Sensor and an evaluation unit, wherein for the detection of single sheets and / or multiple sheets in the evaluation of the output signals an arc detection signal is derived.
  • sensors are at least one capacitive Sensor and at least one ultrasonic sensor provided.
  • the bow detection signal becomes a logical combination of the output signals Derived from the sensors, the logical link depending on the during an adjustment phase determined output signals of the sensors the evaluation unit is set.
  • ISSN 1023-0823 is a double-sheet control for tact-controlled machines described.
  • This double-layer control works with an optical sensor and optionally a capacitive sensor and an ultrasonic sensor for compensation of drifts of the capacitive sensor.
  • single and double sheets are manual in a learning phase Adjustment of the sensors.
  • the invention has for its object to provide a method by means of whose as accurate and secure distinction of single sheets and multiple sheets of different stacking height in sheet processing Machines is possible.
  • the signal level of the sensor is detected in a time-resolved manner in the detection of a single sheet and subsequent detection of multiple sheets, wherein a further sheet is added successively to a single sheet.
  • the detection of the signal level in the detection of a single arc by means of a manual adjustment of the sensor, whereas the detection of the signal level for detecting the multiple sheets is carried out in a predetermined measuring unit via an evaluation unit.
  • the detection of single and multiple sheets takes place on the basis of the taught-in threshold values.
  • the basic idea of the invention is therefore that of the during the learning phase detected signal levels of the sensor in the detection of Single sheets and multiple sheets of different stack heights of sheets automatically thresholds are derived by means of which in the following Operating phase single and multiple sheets can be distinguished. It is essential that the threshold values are chosen such that they are not only a general distinction between single sheets and multiple sheets possible becomes. Rather, it can be determined by means of a threshold evaluation during the operating phase are clearly distinguished, whether in the sheet processing Machine is promoted a double, triple or quadruple arch.
  • inventive method for different types of sheet-processing machines including printing machines, such as Sheet-fed offset printing machines, gathering machines, laminating machines or folding machines used.
  • one or more Sensors are used. Particularly advantageous are capacitive sensors used for arc detection, their signals regardless of any printing of the bows are. Furthermore, it is advantageous that with capacitive Sensors arches of different material properties can be detected. Especially The sheets of paper, plastic, wood or cardboard, in particular Consist of corrugated board.
  • At least one ultrasonic sensor is particularly advantageous as an additional sensor used.
  • the signals generated by this sensor become the Compensation of drifts, i. Signal fluctuations of the capacitive sensor used.
  • only the signal level of the sensor is used for the detection of an n-fold arc for calculating a threshold, this with a provided in the evaluability scaling factor F n, n + 1 for generating the corresponding threshold value S n, n + 1 , which is used to distinguish n times and (n + 1) times arcs.
  • the arithmetic mean of the signal level of the sensor contained in the detection of an n-fold and (n + 1) -fold arc (2) is formed in the evaluation unit for calculating the threshold value S n, n + 1 .
  • FIG. 1 shows schematically a section of a sheet-processing machine 1.
  • the sheet processing machine 1 is in the present case of a Printing machine, in particular a sheetfed offset machine formed.
  • sheets 2 on a pad 3 as for example, a feed table isolated and in a scattered scale promoted.
  • a sensor arrangement is provided, by means of which a detection and distinction of single sheets and multiple sheets different stack heights is possible.
  • the sensor arrangement has a capacitive sensor 4 and an ultrasonic sensor 5, which are connected to a common evaluation unit 6.
  • the sensor assembly is mounted in brackets, not shown, at the sheet processing machine 1 are attached.
  • the capacitive sensor 4 and the ultrasonic sensor 5 are on the center the sheets 2 aligned, which in the conveying direction of the sheets 2 tight are arranged one behind the other lying.
  • the order of the individual sensors in the conveying direction can be chosen arbitrarily. Also a juxtaposition these sensors 4 is possible.
  • the capacitive sensor 4 has an electrode 4a above the sheets 2 and a Counter electrode 4b below the sheets 2. Depending on the number of sheets 2 in Gap between the electrode 4a and the counter electrode 4b varies the capacitance between electrode 4a and counter electrode 4b and thus leads to corresponding changes in the amplitudes of the output signals of the capacitive Sensors 4.
  • the ultrasonic sensor 5 has an ultrasonic transducer emitting ultrasonic waves 5a, which is arranged just above the sheets 2. Every ultrasound generator is located just below the sheets 2 arranged ultrasonic receiver 5b opposite.
  • a sheet 2 or lie multiple sheets 2 results in a different attenuation of the ultrasonic waves and accordingly a different amplitude of the Output signal of the ultrasonic sensor 5.
  • sensors 4 In extension of the sensor arrangement according to the figures 1 and 2 can also a plurality of capacitive sensors 4 and ultrasonic sensors 5 are provided. Alternatively or additionally, other sensors 4 such as be provided inductive or optical sensors.
  • the evaluation unit 6 has a computer unit which, for example, from a microprocessor is formed.
  • the evaluation unit 6 as a connection means a predetermined number of inputs not shown separately and outputs on.
  • About inputs of the evaluation unit 6 are to The signals generated by the sensors 4 as well as parameter values are read. about Outputs of the evaluation unit 6, the output of output signals.
  • the output signals are in the form of sheet detection signals. These generally indicate whether the sensor arrangement is a single arc or a multiple arc of certain stack height has been detected. Especially advantageous the output signal in the evaluation unit 6 is adjustable. It is the output signal preferably formed as a switching signal. Depending on the setting the output signal is given by a corresponding assignment of Switching states a distinction between single and double arcs, double and triple sheets or of triple and quadruple sheets.
  • the signal levels of the capacitive sensor 4 are the higher the higher Number of sheets 2 in the region of the sensor 4 is.
  • To distinguish between single sheets and multiple bends of different stack height become the signal levels of the capacitive sensor 4 with suitable thresholds.
  • the ultrasonic sensor 5 essentially serves only for checking, whether there is an arc 2 at all in the area of the sensor arrangement. The This registered signals are used to compensate for drift of the capacitive Sensors 4.
  • the threshold values with which the signal levels of the capacitive sensor 4 are evaluated are, according to the invention during a training phase in the Evaluation unit 6 set.
  • the determination of the thresholds takes place in Dependence of the signals of the capacitive sensor 4.
  • Figures 2a, 2b and 3a, 3b illustrate different embodiments to carry out the threshold determinations during the Learning phase.
  • the teaching process in the learning phase is initiated with a manual calibration.
  • the manual adjustment of the capacitive sensor 4 is aligned to a single arc and thereby stored in the capacitive sensor 4 signal level I 1 stored.
  • a threshold value S 12 for distinguishing between a single and a double sheet is calculated from a signal level I 1 .
  • F 12 is a scaling factor, which is stored in the evaluation unit 6 and which lies in the range 1 ⁇ F 12 ⁇ 2.
  • the choice of F 12 is based on the knowledge that the signal level of the capacitive sensor 4 is greater, the greater the stack height of the sheets 2 in the sensor area. In the ideal case, ie with completely identical sheets 2 and under ideal measuring conditions, the signal level of the capacitive sensor 4 is twice as large when detecting a double sheet as when detecting a single sheet.
  • FIG. 2a shows the measuring point A, at which with the capacitive sensor 4 each one Sheet 2 is detected. As can be seen from Figure 2a, a sheet 2 during each period at the same sheet position, i. at the same measuring point A detected.
  • a single sheet is again registered.
  • the registered signal level I 1 is compared with the already calculated threshold value S 12 . Since I 1 is below S 12 , this is classified in the evaluation unit 6 as the detection of a single arc.
  • the signal level I 2 obtained is above the threshold value S 12 . Because of this, the signal level is used to calculate a new threshold S 23 , which is used to distinguish between double and triple arcs.
  • F 23 is again a scaling factor whose value lies in the range 1 ⁇ F 23 ⁇ 2 and which is stored in the evaluation unit 6.
  • the value of the scaling factor F 23 5/4.
  • the value of F 23 is smaller than the value of F 12 because the increase in signal level is smaller for a transition from a double to a triple arc than for a transition from a single to a double arc.
  • the scaling factor F 34 stored in the evaluation unit 6 is again in the range 1 ⁇ F 34 ⁇ 2, wherein its value is smaller than the value of the scaling factor F 23 .
  • F 34 7/6.
  • the output signal generated in the evaluation unit 6 can be parameterized in particular as a switching signal, through the switching states of a distinction between single and double sheets, double and triple sheets or triple and quadruple sheets is made.
  • the measuring cycle of the teaching-in phase is preferably maintained, so that the sheets 2 are detected in a defined way at a predetermined measuring point A.
  • Figures 3a and 3b illustrate a second embodiment of the Implementation of the Einlemphase.
  • an arc detection is performed within a period T with the capacitive sensor 4 at two different measuring points A and B.
  • the measurements at the measuring points A within subperiods T 1 and the measurements at the measuring points B are carried out within subperiods T 2 .
  • the sub-periods are selected so that, as shown in Figure 3b, the measuring point A is in each case in front of the range of desquamation of the sheets 2, while the measuring point B is in the range of scaling.
  • the case illustrated in FIG. 3b is that a single sheet is registered at the measuring point A, but a double sheet is registered at the measuring point B in the region of the scaling. Accordingly, at signal point A the signal level I 1 is obtained for a single arc and at the measuring point B the signal level I 2 for a double sheet which is significantly greater than the value I 1 .
  • S 23 1 ⁇ 2 (I 2 + I 3 ).
  • the determination of the threshold value S 34 for distinguishing triple and quadruple bends takes place correspondingly.
  • I 3 , I 4 are the signal levels in the detection of a triple or quadruple arc at the measuring points A and B, respectively.
  • the scaling interrupted and at the measuring points A and B are equal signal levels registered.
  • the signal level A at the measuring points A and B are generally checked whether the sheet transport is interrupted or not.
  • the method described in FIG. 3 a can be modified such that the threshold value S 12 is calculated analogously to the exemplary embodiment according to FIG. 2 a during the manual adjustment.

Landscapes

  • Controlling Sheets Or Webs (AREA)

Claims (8)

  1. Procédé de fonctionnement d'au moins un capteur (4) pour la détection de feuilles (2) dans une machine de traitement de feuilles (1), comprenant les étapes de procédé suivantes :
    exécution d'une phase d'apprentissage comprenant les sous-étapes suivantes :
    saisie à résolution temporelle des niveaux de signal du capteur (4) lors de la détection d'une feuille simple et de la détection suivante de feuilles multiples, une autre feuille (2) étant successivement ajoutée à une feuille simple, la saisie du niveau de signal du capteur (4) lors de la détection d'une feuille simple dans la phase d'apprentissage étant réalisée au moyen d'un réglage manuel du capteur (4) et la saisie des niveaux de signal du capteur (4) pour la détection de feuilles multiples dans la phase d'apprentissage étant réalisée à une cadence de mesure fixée par une unité d'évaluation (6),
    calcul de valeurs seuils Sn,n+1 dans une unité d'évaluation (6) à l'aide des niveaux de signal mesurés pour différencier respectivement une pile de feuilles de n et n + 1 feuilles (2), n comprenant au moins la plage n = 1, 2, 3.
    détection de feuilles simples et multiples à l'aide des valeurs seuils apprises, ce pendant une phase d'exploitation succédant à la phase d'apprentissage.
  2. Procédé selon la revendication 1, caractérisé par le fait que pour calculer une valeur seuil Sn,n+1 permettant de différencier des piles de feuilles constituées de n feuilles (2) et des piles de feuilles constituées de n+1 feuilles (2), on multiplie dans l'unité d'évaluation (6) le niveau de signal du capteur (4) lors de la détection d'une pile de feuilles constituée de n feuilles (2) par un facteur d'échelle Fn,n+1, avec 1 < Fn,n+1 < 2.
  3. Procédé selon la revendication 2, caractérisé par le fait que les valeurs des facteurs d'échelle Fn,n+1 peuvent être entrées sous forme de paramètres dans l'unité d'évaluation (6).
  4. Procédé selon la revendication 1, caractérisé par le fait que pour calculer une valeur seuil Sn,n+1 permettant de différencier des piles de feuilles constituées de n feuilles (2) et des piles de feuilles constituées de n+1 feuilles (2), on forme dans l'unité d'évaluation (6) la moyenne arithmétique des niveaux de signal du capteur (4) lors de la détection des piles de feuilles correspondantes pendant la phase d'apprentissage.
  5. Procédé selon la revendication 4, caractérisé par le fait que pour la détection des feuilles multiples pendant la phase d'apprentissage on fixe dans l'unité d'évaluation (6) une cadence de mesure périodique, deux mesures étant effectuées avec le capteur (4) pendant chaque période et les niveaux de signal obtenus à cette occasion étant utilisés pour le calcul d'une valeur seuil Sn,n+1.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé par le fait que le capteur (4) est formé d'un capteur capacitif (4).
  7. Procédé selon la revendication 6, caractérisé par le fait que l'on utilise un capteur à ultrasons (5) pour compenser la dérive du capteur capacitif (4).
  8. Procédé selon l'une des revendications 1 à 7, caractérisé par le fait que la machine de traitement de feuilles (1) est formée d'une machine à imprimer, d'une machine à assembler, d'une machine à doubler ou d'une machine à plier.
EP20020021524 2002-09-26 2002-09-26 Procédé d'opération d'un détecteur pour la détection des feuilles dans une machine de traitement de feuilles Expired - Lifetime EP1403202B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE50205040T DE50205040D1 (de) 2002-09-26 2002-09-26 Verfahren zum Betrieb eines Sensors zur Erfassung von Bögen in einer bogenverarbeitenden Maschine
EP20020021524 EP1403202B1 (fr) 2002-09-26 2002-09-26 Procédé d'opération d'un détecteur pour la détection des feuilles dans une machine de traitement de feuilles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20020021524 EP1403202B1 (fr) 2002-09-26 2002-09-26 Procédé d'opération d'un détecteur pour la détection des feuilles dans une machine de traitement de feuilles

Publications (2)

Publication Number Publication Date
EP1403202A1 EP1403202A1 (fr) 2004-03-31
EP1403202B1 true EP1403202B1 (fr) 2005-11-23

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EP20020021524 Expired - Lifetime EP1403202B1 (fr) 2002-09-26 2002-09-26 Procédé d'opération d'un détecteur pour la détection des feuilles dans une machine de traitement de feuilles

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DE (1) DE50205040D1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005019617A1 (de) * 2004-12-22 2006-07-06 Man Roland Druckmaschinen Ag Bogenverarbeitende Vorrichtung, insbesondere Bogendruckmaschine
DE102006037248B4 (de) * 2006-08-09 2021-01-14 manroland sheetfed GmbH Falschbogensensor einer Druckbogen verarbeitenden Maschine
DE102007003001A1 (de) 2007-01-20 2008-07-24 Man Roland Druckmaschinen Ag Bogendruckmaschine

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3826487A (en) * 1972-01-24 1974-07-30 Polygraph Leipzig Control apparatus and method for transporting sheets
EP0168202B1 (fr) * 1984-06-28 1988-09-14 De La Rue Systems Limited Procédé et appareil pour contrôler des feuilles
EP0556486B1 (fr) * 1992-02-19 1996-03-06 Ferag AG Détecteur de double feuille
GB9626835D0 (en) * 1996-12-24 1997-02-12 Ncr Int Inc Apparatus for detecting the passage of multiple superposed sheets along a feed path
GB9626848D0 (en) * 1996-12-24 1997-02-12 Ncr Int Inc System for detecting multiple superposed sheets
US6405152B1 (en) * 1998-05-18 2002-06-11 Prim Hall Enterprises, Inc. Precision calipering system
DE20018193U1 (de) * 2000-10-25 2001-01-04 Leuze Electronic Gmbh + Co, 73277 Owen Vorrichtung zur Kontrolle von Bögen

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DE50205040D1 (de) 2005-12-29
EP1403202A1 (fr) 2004-03-31

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