EP1637486B1 - Procédé et dispositif de mesurer l'épaisseur des produits imprimés passant un dispositif de mesure dans un courant de transport en étant espacés à une distance déterminée - Google Patents

Procédé et dispositif de mesurer l'épaisseur des produits imprimés passant un dispositif de mesure dans un courant de transport en étant espacés à une distance déterminée Download PDF

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Publication number
EP1637486B1
EP1637486B1 EP04405601A EP04405601A EP1637486B1 EP 1637486 B1 EP1637486 B1 EP 1637486B1 EP 04405601 A EP04405601 A EP 04405601A EP 04405601 A EP04405601 A EP 04405601A EP 1637486 B1 EP1637486 B1 EP 1637486B1
Authority
EP
European Patent Office
Prior art keywords
measuring
printed products
thickness
plate capacitor
measurement
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
EP04405601A
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German (de)
English (en)
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EP1637486A1 (fr
Inventor
Hanspeter Duss
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 Martini Holding AG
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Mueller Martini Holding AG
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Filing date
Publication date
Application filed by Mueller Martini Holding AG filed Critical Mueller Martini Holding AG
Priority to DE502004005511T priority Critical patent/DE502004005511D1/de
Priority to EP04405601A priority patent/EP1637486B1/fr
Priority to US11/228,321 priority patent/US7486087B2/en
Priority to JP2005272305A priority patent/JP2006091015A/ja
Publication of EP1637486A1 publication Critical patent/EP1637486A1/fr
Application granted granted Critical
Publication of EP1637486B1 publication Critical patent/EP1637486B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • B65H2553/00—Sensing or detecting means
    • B65H2553/20—Sensing or detecting means using electric elements
    • B65H2553/23—Capacitive detectors, e.g. electrode arrangements

Definitions

  • the invention relates to a method and a device for measuring the thickness of in a flow at certain intervals a continuous flow of pressure from a plate capacitor formed measuring device.
  • Clocked transport devices often have a rotating, provided with grippers drum which seize to be separated printing products and handed over to one or more conveyor belts.
  • a thickness measurement of the printed products can now take place in the rotating drum or the subsequent transport device, for example between belts.
  • Known systems detect the product thickness, for example, by mechanically scanning the thickness and measuring the deflection produced by the printed product.
  • This evaluation uses an analog signal whose magnitude reflects the capacitive reading.
  • the reference capacity must be adjusted manually.
  • the pre-published DE 195 49 351 A1 teaches a device for controlling sheets, which are transferred from a stack isolated in a sheet-processing machine. On this conveyor, the arc passes through a capacitive transducer, which is connected to an evaluation unit.
  • a sheet feeder which is formed by a mechanical pick-off device.
  • the sheets are withdrawn from at least one attached to a rotating gripper drum gripper from a sheet stack and fed to a further processing.
  • a co-rotating sensor With the gripper on the circumference of the gripping drum gripping a co-rotating sensor is connected, which acts as a mechanically actuated signal generator.
  • the DE-A-37 19 972 discloses an apparatus for detecting multiple sheets and for monitoring layer thickness in processing and processing machines, in particular in sheet-fed presses, according to the capacitive measuring principle.
  • the inventive method and a feeder with a conveyor drum 1 for separating printed products 3 as a device according to FIG. 1 are based on the effect that a plate capacitor 11 increases its capacity, if in addition a fabric 3 as paper between the plates 1, 4 is located.
  • An oscillator circuit 12 excites the oscillations of the LC oscillation circuit, by means of a voltage follower 13, a quark ring 11c is generated as part of the plate capacitor 11, so that the properties of the measuring part 11b of the plate capacitor 11 are improved.
  • the amplitude control 14 contributes.
  • a comparator stage 15 converts the sinusoidal oscillations into a square-wave signal, which is processed by an evaluation unit 16.
  • the evaluation unit 16 receives position signals from incremental encoder 2 and sends the results resp. Dickenmesshong to a higher-level control 9.
  • a subsequent evaluation electronics must still measure the resonance frequency, which is much less susceptible to interference than the evaluation of an analog signal, as is necessary in the known bridge circuit with a predetermined frequency and a reference capacitance.
  • a further advantage of the device according to the invention is that the oscillator frequency to be measured can be determined by averaging several time measurements of individual periods of the oscillations, whereby individual periods which deviate too much in time and possibly also the adjacent periods may be disregarded in the evaluation. This filtering allows even short, strong glitches of externally distort the oscillator frequency, but not the measured value.
  • a principal advantage of a device for measuring thickness on a capacitive basis is that the measurement can take place at any time, for example in a predetermined position detected by an incremental encoder 2, and this also several times per processing cycle. This property can be used to perform a new measurement for the printed product thickness 0, the so-called zero measurement 20, in a possibly existing gap between two products. If the time of measurement is also recorded, a temporal trend 18 of the effective zero value can be determined from a plurality of consecutively following zero measurements. As a result, all the slow drift phenomena of such a measuring system, caused by thermal changes in the electronics or by slow, mechanical deformations of the plate capacitor, can be compensated.
  • a trend of the zero values can also be calculated approximately in a gap-free flow between the printed products. For this purpose, zero measurements are made in a gap of the flow or immediately before. If the printed products then follow seamlessly or even overlapping, only the measured values of the product thicknesses are saved at the time of measurement. The trend line of the zero values can still be calculated by subtracting a reference thickness by using only measurements from printed products that are sufficiently sure to represent a correct thickness.
  • Methods for measuring product thicknesses are known to be suitable in a first phase, the reference phase, determine a reference thickness 21 by at least once in each case a measured value without and with printed product is detected in this first phase, in other ways it is known whether the measurement was done without a sheet or with a correct sheet. From these values a reference value for the correct product thickness can be determined.
  • the control phase the further measurements on printed products of unknown thickness are compared with the reference value determined first, in order to send an error signal to a higher-level controller if the determined product thickness deviates from the reference value by more than a tolerance value.
  • the difficulty often proves in the prior art that a measuring system has a drift, in particular, the zero measurements change over time.
  • Known systems often have no way to repeat the zero measurement often.
  • the inventive method starts and continuously calculates the drift of the system by calculating a trend line for the zero value.
  • the measurement of the printed product thickness 19 can also be used to calculate a new zero measurement. For this purpose, according to FIG. 3, first the measured value 19, the zero value extrapolated from the trend line 18 and the result of the reference value from the first phase are compared. If the two values are similar, then it is deduced that a printed sheet with the correct thickness is present.
  • the measured value 19 is additionally used to calculate a new theoretical zero measurement 23 by subtracting the reference value determined in the first phase from the measured value 19. Together with the also recorded measuring time of the Measured value 19 and the previous zero measurements is a trend of the drift, the trend line 18 of the zero value is calculated. In the subsequent thickness measurement, in turn, a zero value extrapolated for the new measuring time is used.
  • the above method can be improved by directly measuring the new zero value and not from a thickness measurement with printed products, allowing even more reliable trend analysis of the zero value.
  • the device also allows new methods to eliminate external noise that are not feasible with previous methods that rely on the measurement of an analog measurement of current or voltage, as these are usually an integral measurement over a measurement time of a few milliseconds deliver. Therefore, a timing device is provided in the digital evaluation unit 16, which can measure and store the duration of many successive oscillation periods with high accuracy. External disturbances usually occur as so-called bursts and can only falsify a few of the recorded oscillation periods. These measurements can be detected by means of a statistical analysis and excluded during further processing.

Landscapes

  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (9)

  1. Procédé pour mesurer l'épaisseur de produits imprimés (3) passant un dispositif de mesure formé d'un condensateur à lames (11) à des distances déterminées dans un courant ou flux de transport, l'épaisseur des produits imprimés étant déterminée par une mesure capacitive dans le condensateur à lames (11), caractérisé en ce que le condensateur à lames (11) fait partie d'un oscillateur LC (22) et que la mesure est effectuée à la cadence de traitement des produits imprimés (3) et par le biais d'une fréquence de résonance d'un circuit oscillant LC.
  2. Procédé selon la revendication 1, caractérisé en ce que les valeurs de la fréquence de résonance mesurées sont saisies et mémorisées avec l'instant de mesure par une unité d'évaluation numérique (16) et que plusieurs des valeurs mémorisées sont utilisées, après déduction d'une épaisseur de référence, pour former une ligne de tendance d'une valeur nulle.
  3. Procédé selon la revendication 1, avec un courant ou flux de transport formé de produits imprimés (3) espacés, caractérisé en ce qu'une mesure est effectuée chaque fois sur les produits imprimés (3) et sur les lacunes ou espaces entre produits imprimés (3) du courant de transport et mémorisée avec le temps de mesure correspondant et que plusieurs des valeurs mémorisées formées de lacunes sont utilisées pour former une ligne de tendance d'une valeur nulle.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que plusieurs temps de mesure de périodes d'oscillations successives sont analysés à la recherche de valeurs aberrantes et que ces dernières ainsi que d'éventuels temps de mesure adjacents sont exclus de l'évaluation.
  5. Procédé selon la revendication 4, caractérisé en ce que les temps de mesure restants pour le calcul sont utilisés pour déterminer une fréquence de résonance plus précise.
  6. Dispositif pour mesurer l'épaisseur de produits imprimés (3) passant un dispositif de mesure capacitif formé d'un condensateur à lames (11) à des distances déterminées dans un courant de transport, caractérisé en ce que le condensateur à lames (11) fait partie d'un oscillateur LC (22) et que la mesure est effectuée à la cadence de traitement des produits imprimés (3) par le biais d'une fréquence de résonance d'un circuit oscillant LC.
  7. Dispositif selon la revendication 6, caractérisé en ce qu'un circuit gyrateur (10) est prévu pour former l'inductance L.
  8. Dispositif selon la revendication 6 ou 7, caractérisé en ce que le condensateur à lames (11) est entouré d'un anneau de garde (11c).
  9. Dispositif selon l'une des revendications 6 à 8, caractérisé en ce qu'une unité d'évaluation (16) reliée à l'oscillateur LC (22) est prévue.
EP04405601A 2004-09-20 2004-09-20 Procédé et dispositif de mesurer l'épaisseur des produits imprimés passant un dispositif de mesure dans un courant de transport en étant espacés à une distance déterminée Expired - Lifetime EP1637486B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE502004005511T DE502004005511D1 (de) 2004-09-20 2004-09-20 Verfahren und Einrichtung zum Messen der Dicke von in einem Förderstrom in bestimmten Abständen eine Messeinrichtung durchlaufenden Druckprodukten
EP04405601A EP1637486B1 (fr) 2004-09-20 2004-09-20 Procédé et dispositif de mesurer l'épaisseur des produits imprimés passant un dispositif de mesure dans un courant de transport en étant espacés à une distance déterminée
US11/228,321 US7486087B2 (en) 2004-09-20 2005-09-19 Method for measuring thickness of print products passing spaced apart at specific distances in a conveying flow through a measuring device
JP2005272305A JP2006091015A (ja) 2004-09-20 2005-09-20 搬送列流内において所定間隔で計測装置を通過する印刷物の厚みを計測する方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04405601A EP1637486B1 (fr) 2004-09-20 2004-09-20 Procédé et dispositif de mesurer l'épaisseur des produits imprimés passant un dispositif de mesure dans un courant de transport en étant espacés à une distance déterminée

Publications (2)

Publication Number Publication Date
EP1637486A1 EP1637486A1 (fr) 2006-03-22
EP1637486B1 true EP1637486B1 (fr) 2007-11-14

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EP04405601A Expired - Lifetime EP1637486B1 (fr) 2004-09-20 2004-09-20 Procédé et dispositif de mesurer l'épaisseur des produits imprimés passant un dispositif de mesure dans un courant de transport en étant espacés à une distance déterminée

Country Status (4)

Country Link
US (1) US7486087B2 (fr)
EP (1) EP1637486B1 (fr)
JP (1) JP2006091015A (fr)
DE (1) DE502004005511D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202010009712U1 (de) 2010-06-30 2011-11-10 Pepperl + Fuchs Gmbh Vorrichtung zur Ermittlung der Dicke von Druckmedien
DE202014005970U1 (de) 2014-07-25 2014-08-21 Pepperl + Fuchs Gmbh Vorrichtung zur Ermittlung der Dicke von Druckmedien

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JPS61205804A (ja) * 1985-03-11 1986-09-12 Nippon Steel Corp 金属材料の体積測定装置
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202010009712U1 (de) 2010-06-30 2011-11-10 Pepperl + Fuchs Gmbh Vorrichtung zur Ermittlung der Dicke von Druckmedien
DE202014005970U1 (de) 2014-07-25 2014-08-21 Pepperl + Fuchs Gmbh Vorrichtung zur Ermittlung der Dicke von Druckmedien

Also Published As

Publication number Publication date
DE502004005511D1 (de) 2007-12-27
EP1637486A1 (fr) 2006-03-22
US20060061370A1 (en) 2006-03-23
US7486087B2 (en) 2009-02-03
JP2006091015A (ja) 2006-04-06

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