EP1637486A1 - Method and device for measuring the thickness of specifically spaced printed products passing a measuring device in a transport stream - Google Patents

Method and device for measuring the thickness of specifically spaced printed products passing a measuring device in a transport stream Download PDF

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Publication number
EP1637486A1
EP1637486A1 EP04405601A EP04405601A EP1637486A1 EP 1637486 A1 EP1637486 A1 EP 1637486A1 EP 04405601 A EP04405601 A EP 04405601A EP 04405601 A EP04405601 A EP 04405601A EP 1637486 A1 EP1637486 A1 EP 1637486A1
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EP
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Prior art keywords
printed products
measuring
thickness
measurement
plate capacitor
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EP04405601A
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German (de)
French (fr)
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EP1637486B1 (en
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Hanspeter Duss
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Mueller Martini Holding AG
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Mueller Martini Holding AG
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Priority to DE502004005511T priority Critical patent/DE502004005511D1/en
Priority to EP04405601A priority patent/EP1637486B1/en
Priority to US11/228,321 priority patent/US7486087B2/en
Priority to JP2005272305A priority patent/JP2006091015A/en
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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
    • 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 for measuring the thickness of in a flow at certain intervals a measuring device continuous printing products.
  • 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 be made in the rotating drum or the subsequent transport device, e.g. between ribbons.
  • Known systems detect the product thickness, for example, by mechanically scanning the thickness and measuring the deflection produced by the printed product.
  • a measurement in the rotating system with grippers is only useful if the extraction principle uses grippers.
  • a scan by means of rollers can be mechanically complex, especially when the clock rate is high and the differences in thickness are large and when markings must be prevented.
  • This evaluation uses an analog signal whose magnitude reflects the capacitive reading. As a rule, the reference capacity must be adjusted manually.
  • CH 671 754 has become known a device for measuring the thickness of printed products on a rotating drum with grippers.
  • the object is achieved in that the thickness of the printed products is determined by a capacitive measurement in a plate capacitor.
  • 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 substance 3 such 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.
  • 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.
  • 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. This can be done in two ways: If no new zero measurement is possible within a processing cycle, a new zero measurement can also be calculated from the measurement of the printed product thickness 19. 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.

Abstract

Method for measuring the thickness of printed products fed in a spaced stream involves passing them though a plate capacitor (11) which forms part of a liquid crystal oscillator circuit. An independent claim is included for an apparatus for carrying out the above method.

Description

Die Erfindung betrifft ein Verfahren zum Messen der Dicke von in einem Förderstrom in bestimmten Abständen eine Messeinrichtung durchlaufenden Druckprodukten.The invention relates to a method for measuring the thickness of in a flow at certain intervals a measuring device continuous printing products.

Getaktet arbeitende Transportvorrichtungen weisen oft eine rotierende, mit Greifern versehene Trommel auf, welche zu vereinzelnde Druckprodukte ergreifen und einem oder mehreren Transportbändern übergeben. Eine Dickenmessung der Druckprodukte kann nun in der rotierenden Trommel oder den anschliessenden Transportvorrichtung z.B. zwischen Bändern erfolgen. Bekannte Systeme erfassen die Produktdicke beispielsweise durch mechanisches Abtasten der Dicke und durch Messen der durch das Druckprodukt entstandenen Auslenkung.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 be made in the rotating drum or the subsequent transport device, e.g. between ribbons. Known systems detect the product thickness, for example, by mechanically scanning the thickness and measuring the deflection produced by the printed product.

Diese Systeme sind mit unterschiedlichen Nachteilen behaftet. Eine Messung im rotierenden System mit Greifern ist nur sinnvoll, wenn das Abzugsprinzip Greifer verwendet. Eine Abtastung mittels Rollen kann mechanisch aufwändig sein, insbesondere wenn die Taktrate hoch und die Dickenunterschiede gross sind und wenn Markierungen verhindert werden müssen.These systems have various disadvantages. A measurement in the rotating system with grippers is only useful if the extraction principle uses grippers. A scan by means of rollers can be mechanically complex, especially when the clock rate is high and the differences in thickness are large and when markings must be prevented.

Es sind auch Systeme bekannt, die berührungslos arbeiten, indem sie den Grad der Licht- oder Ultraschallabsorption eines Druckproduktes messen und den gemessenen Wert als Mass für die Dicke des Druckproduktes verwenden. Diese Methoden sind jedoch nur mit sehr dünnen Produkten anwendbar.Systems are also known which operate non-contact by measuring the degree of light or ultrasonic absorption of a printed product and using the measured value as a measure of the thickness of the printed product. However, these methods are only applicable with very thin products.

Bekannt sind Vorrichtungen zur Papierdickenmessung beim Auf- und Abwickeln von Papierrollen, oder auch die Dickenmessung von Etiketten auf einem Trägerband mittels Messung der Kapazität. Merkmale dieser Messanordnungen beruhen auf Brückenschaltungen, wo die Messkapazität mit einer Referenzkapazität elektronisch verglichen wird.Are known devices for paper thickness measurement in the winding and unwinding of paper rolls, or the thickness measurement of labels on a carrier tape by measuring the capacity. Features of these measurement arrangements are based on bridge circuits where the measurement capacitance is electronically compared to a reference capacitance.

Diese Auswertung verwendet ein analoges Signal, dessen Grösse den kapazitiven Messwert widerspiegelt.
In der Regel muss die Referenzkapazität manuell abgeglichen werden.This evaluation uses an analog signal whose magnitude reflects the capacitive reading.
As a rule, the reference capacity must be adjusted manually.

Solche Lösungen haben den Nachteil, dass meist ein individueller Abgleich der Vorrichtung notwendig ist, und dass das die Kapazität repräsentierende Analogsignal störungsanfällig ist, sodass aufwändige Konstruktionen erforderlich sind.Such solutions have the disadvantage that an individual adjustment of the device is usually necessary, and that the analog signal representing the capacitance is prone to failure, so that expensive constructions are required.

Bekannt geworden ist durch die CH 671 754 eine Vorrichtung zur Dickenmessung von Druckprodukten an einer rotierenden Trommel mit Greifern.CH 671 754 has become known a device for measuring the thickness of printed products on a rotating drum with grippers.

Es ist Aufgabe der vorliegenden Erfindung, Dickenmessungen von in einem Förderstrom durchlaufenden Druckprodukten mit grossem Messbereich durchführen zu können, ohne dass dabei unerwünschte Markierungen an den Druckprodukten entstehen und die so kostengünstig wie bestehende Dickenmesseinrichtungen sind.It is an object of the present invention to be able to carry out thickness measurements of printed products passing through in a conveying flow with a large measuring range, without causing undesired markings on the printed products and which are as cost-effective as existing thickness measuring devices.

Erfindungsgemäss wird die Aufgabe dadurch gelöst, dass die Dicke der Druckprodukte durch eine kapazitive Messung in einem Plattenkondensator ermittelt wird.According to the invention, the object is achieved in that the thickness of the printed products is determined by a capacitive measurement in a plate capacitor.

Anschliessend wird die Erfindung unter Bezugnahme auf die Zeichnung, auf die bezüglich aller in der Beschreibung nicht näher erwähnten Einzelheiten verwiesen wird, anhand eines Ausführungsbeispiels erläutert. In der Zeichnung zeigen:

Fig. 1
eine Einrichtung zur Durchführung des erfindungsgemässen Verfahrens,
Fig. 2
den schematischen Aufbau des erfindungsgemässen Verfahrens anhand einer Einrichtung und
Fig. 3
ein Schema zur Berechnung der Trendlinie des zeitabhängigen Nullwertes eines Förderstromes aus Druckprodukten.
Subsequently, the invention will be explained with reference to the drawing, to which reference is made with respect to all unspecified details in the description, based on an embodiment. In the drawing show:
Fig. 1
a device for carrying out the method according to the invention,
Fig. 2
the schematic structure of the inventive method by means of a device and
Fig. 3
a scheme for calculating the trend line of the time-dependent zero value of a flow of printed products.

Das erfindungsgemässe Verfahren und ein Anleger mit einer Fördertrommel 1 zur Vereinzelung von Druckprodukten 3 als Vorrichtung gemäss Fig. 1 basieren auf dem Effekt, dass ein Plattenkondensator 11 seine Kapazität erhöht, wenn sich zusätzlich ein Stoff 3 wie Papier zwischen den Platten 1, 4 befindet. Die erfindungsgemässe Methode zur Kapazitätsmessung (siehe Fig. 2) beruht im Gegensatz zu bekannt gewordenen Lösungen auf dem Prinzip, dass der Plattenkondensator 11, gebildet durch die aktive Elektrode 4 und mit Erde 5 verbundenen Fördertrommel 1, mit einer grossen Induktivität, beispielsweise durch eine Gyrator-Schaltung 10, parallel verbunden ist, wodurch die Resonanzfrequenz f des LC Oszillators durch die Formel f = 1 / ( LC ⋅ 2 Π )

Figure imgb0001
festgelegt ist. Ein Oszillatorschaltkreis 12 regt die Schwingungen des LC-Schwingkreises an, mit Hilfe eines Spannungsfolgers 13 wird ein Quardring 11c als Teil des Plattenkondensators 11 erzeugt, so dass die Eigenschaften des Messteils 11b des Plattenkondensators 11 verbessert werden. Zur Verbesserung der Stabilität der Schwingungen trägt die Amplitudenregelung 14 bei. Eine Komparatorstufe 15 verwandelt die sinusförmigen Schwingungen in ein Rechtecksignal, welches durch eine Auswerteeinheit 16 verarbeitet wird. Die Auswerteeinheit 16 empfängt Positionssignale von Inkrementalgeber 2 und sendet die Ergebnisse resp. Dickenmesswerte an eine übergeordnete Steuerung 9. Eine nachfolgende Auswertelektronik muss noch die Resonanzfrequenz messen, was wesentlich weniger störungsanfällig ist als die Auswertung eines analogen Signals, wie es bei der bekannten Brückenschaltung mit einer vorgegebenen Frequenz und einer Referenzkapazität notwendig ist.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 substance 3 such as paper between the plates 1, 4 is located. The inventive method for capacitance measurement (see FIG. 2) based in contrast to known solutions on the principle that the plate capacitor 11, formed by the active electrode 4 and connected to earth conveyor drum 5 1, with a large inductance, for example by a gyrator circuit 10, is connected in parallel, whereby the resonant frequency f of the LC oscillator through the formula f = 1 / ( LC ⋅ 2 Π )
Figure imgb0001
 is fixed. 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. To improve the stability of the oscillations, 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. Dickenmesswerte 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.

Ein weiterer Vorteil der erfindungsgemässen Vorrichtung ist, dass die zu messende Oszillatorfrequenz durch Mittelung aus mehreren Zeitmessungen einzelner Perioden der Schwingungen ermittelt werden kann, wobei einzelne, zeitlich zu stark abweichende Perioden und allenfalls auch die benachbarten Perioden bei der Auswertung unberücksichtig bleiben können. Diese Filterung erlaubt es, dass auch kurze, starke Störimpulse von aussen zwar kurzzeitig die Oszillatorfrequenz verfälschen, aber nicht den ermittelten Messwert.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.

Ein prinzipieller Vorzug einer Vorrichtung zur Dickenmessung auf kapazitiver Basis ist, dass die Messung jederzeit, beispielsweise in einer vorgegebenen, durch einen Inkrementalgeber 2 erfassten Position, erfolgen kann, und dies auch mehrfach pro Verarbeitungstakt. Diese Eigenschaft lässt sich nutzen, um in einer allenfalls vorhandenen Lücke zwischen zwei Produkten eine neue Messung für die Druckproduktdicke 0, die sogenannte Nullmessung 20, durchzuführen. Wird auch der Messzeitpunkt miterfasst, so kann aus mehreren nacheinander folgenden Nullmessungen ein zeitlicher Trend 18 des effektiven Nullwertes ermittelt werden. Dadurch können alle langsamen Drifterscheinungen eines solchen Messsystems, hervorgerufen durch thermische Veränderungen der Elektronik oder durch langsame, mechanische Verformungen des Plattenkondensator, kompensiert werden.
Ein Trend der Nullwerte kann näherungsweise auch in einem lückenfreien Förderstrom zwischen den Druckprodukten berechnet werden. Hierzu werden Nullmessungen in einer Lücke des Förderstromes oder unmittelbar davor vorgenommen. Folgen danach die Druckprodukte nahtlos oder gar überlappend, werden nur noch die Messwerte der Produktdicken mit dem Messzeitpunkt abgespeichert. Die Trendlinie der Nullwerte kann durch Subtraktion einer Referenzdicke dennoch berechnet werden, indem nur Messwerte von Druckprodukten verwendet werden, die genügend sicher eine korrekte Dicke repräsentieren.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.

Für Verfahren zur Messung von Produktdicken ist bekannt, dass sie in geeigneter Weise in einer ersten Phase, der Referenzphase, eine Referenzdicke 21 bestimmen, indem in dieser ersten Phase mindestens je einmal ein Messwert ohne und mit Druckprodukt erfasst wird, wobei auf andere Weise bekannt ist, ob die Messung ohne Druckbogen oder mit einem korrekten Druckbogen erfolgt ist. Aus diesen Werten lässt sich ein Referenzwert für die richtige Produktdicke bestimmen. In einer zweiten Phase, der Kontrollphase, werden die weiteren Messungen an Druckprodukten unbekannter Dicke mit dem zuerst ermittelten Referenzwert verglichen, um daraus einer übergeordneten Steuerung ein Fehlersignal zu senden, falls die ermittelte Produktdicke über einen Toleranzwert vom Referenzwert abweicht.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. In a second phase, 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.

Als Schwierigkeit erweist sich oft beim Stand der Technik, dass ein Messsystem einen Drift aufweist, insbesondere verändern sich die Nullmessungen mit der Zeit. Bekannte Systeme haben oft keine Möglichkeit häufig die Nullmessung zu wiederholen. Hier setzt das erfindungsgemässe Verfahren ein und berechnet fortlaufend die Drift des Systems, indem eine Trendlinie für den Nullwert errechnet wird. Dies kann auf zwei Wegen erfolgen: Wenn keine neue Nullmessung innerhalb eines Verarbeitungstaktes möglich ist, kann aus der Messung der Druckproduktdicke 19 auch eine neue Nullmessung rechnerisch ermittelt werden. Dazu wird gemäss Fig. 3 zuerst vom Messwert 19, der aus der Trendlinie 18 extrapolierte Nullwert und das Resultat des Referenzwertes aus der ersten Phase verglichen. Sind die beiden Werte ähnlich gross, dann wird daraus abgeleitet, dass ein Druckbogen mit richtiger Dicke vorliegt. In diesem Fall wird der Messwert 19 zusätzlich dazu benutzt, eine neue theoretische Nullmessung 23 zu berechnen, indem der in der ersten Phase ermittelte Referenzwert vom Messwert 19 subtrahiert wird. Zusammen mit dem ebenfalls erfassten Messzeitpunkt des Messwertes 19 und den vorherigen Nullmessungen wird ein Trend der Drift, die Trendlinie 18 des Nullwertes berechnet. Bei der nachfolgenden Dickenmessung wird wiederum ein für die neue Messzeit extrapolierter Nullwert verwendet werden.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. This is where the inventive method starts and continuously calculates the drift of the system by calculating a trend line for the zero value. This can be done in two ways: If no new zero measurement is possible within a processing cycle, a new zero measurement can also be calculated from the measurement of the printed product thickness 19. 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. In this case, 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.

Bei getaktet arbeitenden Transportvorrichtungen mit jeweils einer Lücke zwischen den Produkten kann obiges Verfahren dahingehend verbessert werden, indem der neue Nullwert unmittelbar gemessen und nicht aus einer Dickenmessung mit Druckprodukten ermittelt wird, was eine noch zuverlässigere Trendanalyse des Nullwertes erlaubt.For clocked transport devices, each with a gap between products, 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.

Die Vorrichtung erlaubt auch neue Verfahren, um Störungen von aussen zu beseitigen, die mit bisherigen Verfahren, die auf der Messung eines analogen Messwertes für Strom oder Spannung beruhen, nicht durchführbar sind, da diese in der Regel ein integraler Messwert über eine Messzeit von einigen Millisekunden liefern. Daher ist in der digitalen Auswerteeinheit 16 eine Zeitmessvorrichtung vorhanden, welche die Dauer vieler aufeinander folgender Schwingperioden mit hohen Genauigkeit messen und abspeichern kann. Störungen von aussen treten meist als sogenannte Bursts auf und können nur einige wenige der erfassten Schwingungsperioden verfälschen. Diese Messungen können mittels einer statistischen Analyse aufgespürt und bei der weiteren Verarbeitung ausgeschlossen werden.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.

Claims (11)

Verfahren zum Messen der Dicke von in einem Förderstrom in bestimmten Abständen eine Messeinrichtung durchlaufenden Druckprodukten, dadurch gekennzeichnet, dass die Dicke der Druckprodukte durch eine kapazitive Messung in einem Plattenkondensator ermittelt wird.Method for measuring the thickness of printed products passing through a measuring device at certain intervals in a flow rate, characterized in that the thickness of the printed products is determined by a capacitive measurement in a plate capacitor. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Messung über eine Resonanzfrequenz eines LC-Schwingkreises erfolgt.A method according to claim 1, characterized in that the measurement takes place via a resonant frequency of an LC resonant circuit. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Messung im Verarbeitungstakt der Druckprodukte erfolgt.A method according to claim 1 or 2, characterized in that the measurement is carried out in the processing cycle of the printed products. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die gemessenen Werte der Resonanzfrequenz mit dem Messzeitpunkt von einer digitalen Auswerteeinheit erfasst und gespeichert werden, und mehrere der gespeicherten Werte nach Abzug einer Referenzdicke zur Bildung einer Trendlinie eines Nullwertes verwendet werden.Method according to one of claims 1 to 3, characterized in that the measured values of the resonance frequency with the measuring time of a digital evaluation unit detected and storing, and using a plurality of the stored values after subtracting a reference thickness to form a trend line of zero value. Verfahren nach einem der Ansprüche 1 bis 3, mit einem aus beabstandeten Druckprodukten gebildeten Förderstrom, dadurch gekennzeichnet, dass jeweils eine Messung an Druckprodukten und Lücken zwischen Druckprodukten des Förderstromes vorgenommen und mit der entsprechenden Messzeit gespeichert wird und mehrere der gespeicherten, aus Lücken gebildeten Werte zur Bildung einer Trendlinie eines Nullwertes verwendet werden.Method according to one of claims 1 to 3, comprising a flow formed from spaced printed products, characterized in that in each case a measurement of printed products and gaps between printed products of the flow is made and stored with the corresponding measuring time and several of the stored values formed from gaps Formation of a trend line of a zero value can be used. Verfahren nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, dass mehrere Messzeiten sich folgender Schwingungsperioden nach Ausreissern durchsucht und diese sowie allfällige angrenzende Messzeiten von der Auswertung ausgeschlossen werden.Method according to one of claims 2 to 5, characterized in that several measurement times are searched for outliers following periods of oscillation and these and any adjacent measurement times are excluded from the evaluation. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass die zur Berechnung verbleibenden Messzeiten zur Ermittlung einer genaueren Resonanzfrequenz verwendet werden.A method according to claim 6, characterized in that the remaining for the calculation measurement times are used to determine a more accurate resonant frequency. Einrichtung zum Messen der Dicke von in einem Förderstrom in bestimmten Abständen einen Plattenkondensator (11) durchlaufenden Druckprodukten (3), dadurch gekennzeichnet, dass der Plattenkondensator (11) Teil eines LC-Oszillators (22) ist.Device for measuring the thickness of printed products (3) passing through a plate capacitor (11) in a flow at specific intervals, characterized in that the plate capacitor (11) is part of an LC oscillator (22). Einrichtung nach Anspruch 8, dadurch gekennzeichnet, dass zur Bildung der Induktivität L eine Gyrator-Schaltung (10) vorgesehen ist.Device according to claim 8, characterized in that for the formation of the inductance L, a gyrator circuit (10) is provided. Einrichtung nach Anspruch 8 oder 9, dadurch gekennzeichnet, dass der Plattenkondensator (11) von einem Guardring (11c) umgeben ist.Device according to claim 8 or 9, characterized in that the plate capacitor (11) is surrounded by a guard ring (11c). Einrichtung nach einem der Ansprüche 8 bis 10, dadurch gekennzeichnet, dass eine mit dem LC-Oszillator (22) verbundene Auswerteeinheit (16) vorgesehen ist.Device according to one of claims 8 to 10, characterized in that one with the LC oscillator (22) connected evaluation unit (16) is provided.
EP04405601A 2004-09-20 2004-09-20 Method and device for measuring the thickness of specifically spaced printed products passing a measuring device in a transport stream Not-in-force EP1637486B1 (en)

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DE502004005511T DE502004005511D1 (en) 2004-09-20 2004-09-20 Method and device for measuring the thickness of printed products passing through a measuring device at specific intervals in a flow rate
EP04405601A EP1637486B1 (en) 2004-09-20 2004-09-20 Method and device for measuring the thickness of specifically spaced printed products passing a measuring device in a transport stream
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 (en) 2004-09-20 2005-09-20 Method for measuring thickness of printed matter passing through measuring apparatus at predetermined intervals inside flow of conveyance line

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EP04405601A EP1637486B1 (en) 2004-09-20 2004-09-20 Method and device for measuring the thickness of specifically spaced printed products passing a measuring device in a transport stream

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DE202014005970U1 (en) 2014-07-25 2014-08-21 Pepperl + Fuchs Gmbh Device for determining the thickness of print media

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US20060061370A1 (en) 2006-03-23

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