EP1699719B1 - Method and assembly for identifying overlapped flat mail items - Google Patents

Method and assembly for identifying overlapped flat mail items Download PDF

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Publication number
EP1699719B1
EP1699719B1 EP04798109A EP04798109A EP1699719B1 EP 1699719 B1 EP1699719 B1 EP 1699719B1 EP 04798109 A EP04798109 A EP 04798109A EP 04798109 A EP04798109 A EP 04798109A EP 1699719 B1 EP1699719 B1 EP 1699719B1
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European Patent Office
Prior art keywords
speed
transport
mailpieces
sensors
measured
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Expired - Fee Related
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EP04798109A
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German (de)
French (fr)
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EP1699719A1 (en
Inventor
Oliver Kutzer
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Siemens AG
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Siemens AG
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C3/00—Sorting according to destination
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/30—Orientation, displacement, position of the handled material
    • B65H2301/32—Orientation of handled material
    • B65H2301/321—Standing on edge
    • 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
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/10—Speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/10—Speed
    • B65H2513/11—Speed angular
    • 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
    • B65H2553/51—Encoders, e.g. linear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/19—Specific article or web
    • B65H2701/1916—Envelopes and articles of mail

Definitions

  • the invention relates to a method and an arrangement for detecting overlapped flat items in a transport path for items transported upright in a row.
  • a problem occurring with separating devices consists in so-called double deduction errors which result from the fact that, in addition to the consignment to be deducted from a stack, a further consignment is also removed.
  • double deduction errors which result from the fact that, in addition to the consignment to be deducted from a stack, a further consignment is also removed.
  • the unrecognized double deductions are of particular importance, since they increase the incorrect distribution rate through read errors of the automatic address recognition, but can also result in a mail jam with consignment destruction.
  • the profile of the item height is measured and an overlap is signaled at a height jump ( DE 196 25 044 A1 ).
  • a method and arrangement for detecting program overlaps can be taken by measuring the total length of a program or overlapping program, then shifting overlapping programs relative to one another, and then measuring the overall length again.
  • this solution it is not possible to detect program overlaps when a large and a small program are overlapped and the small program is still in the shadow of the large program before and after being moved.
  • a solution was also known ( DE 101 42 331 C1 ), in which after detecting edges on both sides of the transport path and determining the distances of the detected edges from each measured with a light barrier leading edge on the long sides of the programs is acted on both sides with different transport speeds, without the minimum gaps are exceeded. Then the distances of the edges from the leading leading edge are measured again. With a change in distance a double trigger is detected. Again, the determination of an overlap by means of edge detection.
  • the JP 11334938 A discloses an overlap detection apparatus having two spaced rotational speed sensors.
  • the invention has for its object to recognize overlapped narrow broadcasts in a transport path for consecutively transported upright shipments as early and safe as possible.
  • At least two transport stages are arranged one behind the other in the transport path, wherein the nominal speed of each subsequent transport stage in the transport direction is higher than the rated speed of the upstream transport stage.
  • the speed of the transported programs is measured by sampling before a subsequent transport stage up to a maximum distance smaller than the shortest agreed transmission length by means of two sensors arranged on both sides of the transport path and evaluation of the measurement results, when a sensor measures a speed which is higher than the nominal speed of the sensor subsequent transport stage deviates only by a fixed low value.
  • an overlap detection occurs when the simultaneously measured velocities of the two sensors are different, the smaller measured velocity deviating from the greater velocity by a set value.
  • the overlapped transmissions are determined very early and reliably by measuring the transmission speed.
  • the evaluation of the measurement results begins only after a fixed delay time after the speed jump measured by a sensor to a speed deviating from the nominal speed of the subsequent transport stage only by a predetermined low value.
  • it is the transport path of a separating device in which the flat items 5.6 are separated from a stack in several transport stages 1,2.
  • an acceleration takes place to a higher speed value.
  • the speed of the upstream Transport level 1 reduced. If there is an overlap (double take-off), consignments 5.6 offset from one another can thereby be shifted relative to one another.
  • two transport stages 1, 2 are provided for acceleration, followed by a transport line with a higher nominal speed, which has two take-up rollers 7, 8 at its beginning. It is necessary to monitor if and how long overlaps exist.
  • FIG. 1 For this purpose are according to FIG. 1 in which the two transport stages 1, 2 of the singling device are shown, two sensors 3 4 for measuring the speed of the shipments are arranged between both transport stages 1, 2 on both sides of the transport path. To recognize are also two partially. overlapped broadcasts 5.6, with the front 5 is already in the range of action of the upstream transport stage 2.
  • Each sensor 3, 4 is realized here by means of a roller running on the conveyor surface and driving a tachogenerator. The output signal of the tachogenerator corresponding to the rotational speed is transmitted as a measuring signal to an evaluation device.
  • the two sensors 3,4 are monitored. If the difference between the smallest measured speed and the speed of the subsequent transport stage 2 is greater than a defined limit value, an overlap is detected which pulls apart at the transition between the two transport stages 1, 2 due to the speed differences.
  • the monitoring remains active until the last trailing edge has left the sensors 3,4.
  • FIG. 2 is the transition region between the transport stage 2 and the take-over rollers 7.8 of the subsequent transport route (both forms a third transport stage), shown.
  • the take-over rollers 7, 8 the flat shipments 5, 6 are gripped without slippage in the transport path designed as a shroud system and are transported further with an increased speed relative to the transport step 2. Since the relatively large take-over rollers 7, 8 are arranged so that they can be safely taken over by the shipments 5, 6 close to the transport stage 2, there is not enough space to provide the sensors 9, 10 therebetween. Therefore, the sensors are 9,10 in the transport stage 2 at a distance d less than the shortest to be processed shipments 5.6 of the terminal points of the take-over rollers 7.8.
  • the sensors 9,10 are monitored from this point on. If the difference between the smallest measured speed and the transport speed of the take-up rollers 7, 8 is greater than a defined limit value, then an overlap is also detected.
  • the monitoring remains active until the trailing edge has left the sensors 9,10.
  • the overlap monitoring can be delayed for a short time with the aid of a timer.

Landscapes

  • Controlling Sheets Or Webs (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Sorting Of Articles (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)

Abstract

According to the invention, at least two transport stages (1, 2) are arranged one behind the other in a transport section, the nominal speed of the respective following transport stage (2) in the direction of transport being higher than the nominal speed of the preceding transport stage (1 or 2). The speed of the transported mail items (5, 6) is then measured by scanning said items in front of a following transport stage (2) for a maximum distance that is shorter than the shortest agreed length for a mail item, by means of two sensors (3, 4) that are positioned on either side of the transport section and the measured results are evaluated if a sensor (3, 4) measures a value that deviates only slightly by a defined value from the nominal speed of the following transport stage (2). During the evaluation, an overlap is detected if the speeds measured simultaneously by the two sensors (3, 4) differ and the lower measured speed deviates from the higher measured speed by a defined value.

Description

Die Erfindung betrifft ein Verfahren und eine Anordnung zum Erkennen von überlappten flachen Sendungen in einem Transportpfad für hintereinander aufrecht transportierte Sendungen.The invention relates to a method and an arrangement for detecting overlapped flat items in a transport path for items transported upright in a row.

Ein bei Vereinzelungsvorrichtungen auftretendes Problem besteht in sogenannten Doppelabzugsfehlern, die sich daraus ergeben, dass zusätzlich zu der von einem Stapel abzuziehende Sendung eine weitere Sendung mit abgezogen wird. In Verteilanlagen für flache Sendungen sind die nicht erkannten Doppelabzüge von besonderer Bedeutung, da diese die Fehlverteilungsrate durch Lesefehler der automatischen Anschriftenerkennung erhöhen, aber auch einen Sendungsstau mit Sendungszerstörung zur Folge haben können.A problem occurring with separating devices consists in so-called double deduction errors which result from the fact that, in addition to the consignment to be deducted from a stack, a further consignment is also removed. In distribution systems for flat consignments, the unrecognized double deductions are of particular importance, since they increase the incorrect distribution rate through read errors of the automatic address recognition, but can also result in a mail jam with consignment destruction.

Bei einer bekannten Lösung werden bewegbare Sendungsteile temporär senkrecht zur Fördervorrichtung ausgelenkt. Durch Auswertung des Rückschnellverhaltens der Sendungen wird dann das Vorliegen von überlappten Sendungen detektiert ( EP 0 650 911 B1 ). Da ein unterschiedlicher Versatz der überlappten Sendungen vorliegen kann, muss die Auslenkung sowohl sendungsfrontseitig als auch sendungsrückseitig erfolgen, was erhöhten Aufwand zur Folge hat. Nachteilig ist auch die mechanische Beanspruchung der Sendungen bei der Auslenkung. Ein weiterer Mangel dieser Lösung besteht darin, dass der Versatz der Hinterkanten einen Mindestwert (ca. 10 mm) nicht unterschreiten darf.In a known solution movable parts of the shipment are temporarily deflected perpendicular to the conveyor. By evaluating the recoil behavior of the transmissions, the presence of overlapped transmissions is then detected ( EP 0 650 911 B1 ). Since there may be a different offset of the overlapped transmissions, the deflection must take place both on the front of the broadcast and on the back of the broadcast, which entails increased expenditure. Another disadvantage is the mechanical stress of the shipments in the deflection. Another deficiency of this solution is that the offset of the trailing edges must not fall below a minimum value (about 10 mm).

In einer anderen bekannten Lösung wird das Profil der Sendungshöhe gemessen und bei einem Höhensprung wird eine Überlappung gemeldet ( DE 196 25 044 A1 ).In another known solution, the profile of the item height is measured and an overlap is signaled at a height jump ( DE 196 25 044 A1 ).

Es bestehen Möglichkeiten von Überlappungen zweier Sendungen, welche durch die o.g. Lösungen nicht erkannt werden können. Dies ist insbesondere bei identischen, deckungsgleichen Sendungen der Fall. Es ist jedoch auch möglich, dass eine größte Sendung eine kleinste so abdeckt, dass ein Doppelabzug unerkannt weiter transportiert wird.There are possibilities of overlaps of two programs, which are caused by the o.g. Solutions can not be detected. This is the case in particular for identical, congruent shipments. However, it is also possible that a largest shipment covers a smallest so that a double deduction is transported unrecognized.

In der DE 12 10 601 A wird ein Verfahren und eine Anordnung zum Erkennen von Sendungsüberlappungen beschrieben, wobei Kanten auf beiden Seiten des Transportpfades mittels Messmitteln zur Kantendetektion ermittelt werden. Übereinanderliegende, deckungsgleiche Sendungen sind hiermit nicht zu erkennen.In the DE 12 10 601 A For example, a method and an arrangement for detecting transmission overlaps is described, wherein edges on both sides of the transport path are determined by means of means for edge detection. Overlapping, congruent shipments are not visible hereby.

Der US 5 505 440 A ist ein Verfahren und eine Anordnung zum Erkennen von Sendungsüberlappungen entnehmbar, wobei die Gesamtlänge einer Sendung oder überlappender Sendung gemessen wird, anschließend überlappende Sendungen zueinander verschoben werden und danach die Gesamtlänge erneut gemessen wird. Mit dieser Lösung ist es nicht möglich, Sendungsüberlappungen zu erkennen, wenn eine große und eine kleine Sendung überlappt sind und die kleine Sendung vor und nach dem Verschieben noch im Schatten der großen Sendung liegt.Of the US 5 505 440 A For example, a method and arrangement for detecting program overlaps can be taken by measuring the total length of a program or overlapping program, then shifting overlapping programs relative to one another, and then measuring the overall length again. With this solution, it is not possible to detect program overlaps when a large and a small program are overlapped and the small program is still in the shadow of the large program before and after being moved.

Es wurde auch eine Lösung bekannt ( DE 101 42 331 C1 ), bei der nach dem Detektieren von Kanten auf beiden Seiten des Transportpfades und dem Ermitteln der Abstände der detektierten Kanten von der jeweils mit einer Lichtschranke gemessenen führenden Vorderkante auf die Längsseiten der Sendungen beidseitig mit unterschiedlichen Transportgeschwindigkeiten eingewirkt wird, ohne dass die Mindestlücken unterschritten werden. Dann werden die Abstände der Kanten von der führenden Vorderkante noch einmal gemessen. Bei einer Abstandsveränderung wird ein Doppelabzug detektiert. Auch hier erfolgt die Ermittlung einer Überlappung mittels Kantendetektion.A solution was also known ( DE 101 42 331 C1 ), in which after detecting edges on both sides of the transport path and determining the distances of the detected edges from each measured with a light barrier leading edge on the long sides of the programs is acted on both sides with different transport speeds, without the minimum gaps are exceeded. Then the distances of the edges from the leading leading edge are measured again. With a change in distance a double trigger is detected. Again, the determination of an overlap by means of edge detection.

Aus der WO 01/89 724 A1 und der JP 09-020 438 AA ist es bekannt, innerhalb einer Transportstufe überlappte Sendungen durch einen auf einer Seite des Transportpfads angeordneten Geschwindigkeitssensor zu ermitteln.From the WO 01/89 724 A1 and the JP 09-020 438 AA it is known to determine within a transport stage overlapped broadcasts by a arranged on one side of the transport path speed sensor.

Aus der DE 102 12 024 A1 sind Transportpfade bekannt, bei denen die Nenngeschwindigkeit aufeinander folgender Transportstufen in Transportrichtung zunimmt.From the DE 102 12 024 A1 Transport paths are known in which the nominal speed of successive transport stages increases in the transport direction.

Die JP 11334938 A offenbart eine Überlappungsdetektionsvorrichtung mit zwei beabstandeten Drehgeschwindigkeitssensoren.The JP 11334938 A discloses an overlap detection apparatus having two spaced rotational speed sensors.

Der Erfindung liegt die Aufgabe zugrunde, überlappte schmale Sendungen in einem Transportpfad für hintereinander aufrecht transportierte Sendungen möglichst frühzeitig und sicher zu erkennen.The invention has for its object to recognize overlapped narrow broadcasts in a transport path for consecutively transported upright shipments as early and safe as possible.

Erfindungsgemäß wird die Aufgabe durch die Merkmale der Ansprüche 1 und 4 gelöst.According to the invention the object is achieved by the features of claims 1 and 4.

Dabei werden mindestens zwei Transportstufen hintereinander im Transportpfad angeordnet, wobei die Nenngeschwindigkeit der in Transportrichtung jeweils nachfolgenden Transportstufe höher ist als die Nenngeschwindigkeit der vorgelagerten Transportstufe.In this case, at least two transport stages are arranged one behind the other in the transport path, wherein the nominal speed of each subsequent transport stage in the transport direction is higher than the rated speed of the upstream transport stage.

Dann erfolgt ein Messen der Geschwindigkeit der transportierten Sendungen durch Abtastung vor einer nachfolgenden Transportstufe bis zu einem Maximalabstand kleiner als die kürzeste vereinbarte Sendungslänge mittels zweier beidseitig am Transportpfad angeordneter Sensoren und ein Auswerten der Messergebnisse, wenn ein Sensor eine Geschwindigkeit misst, die von der Nenngeschwindigkeit der nachfolgenden Transportstufe nur um einen festgelegten geringen Wert abweicht.Then the speed of the transported programs is measured by sampling before a subsequent transport stage up to a maximum distance smaller than the shortest agreed transmission length by means of two sensors arranged on both sides of the transport path and evaluation of the measurement results, when a sensor measures a speed which is higher than the nominal speed of the sensor subsequent transport stage deviates only by a fixed low value.

Bei der Auswertung erfolgt ein Detektieren einer Überlappung, wenn die gleichzeitig gemessenen Geschwindigkeiten der beiden Sensoren unterschiedlich sind, wobei die kleinere gemessene Geschwindigkeit um einen festgelegten Wert von der größeren Geschwindigkeit abweicht. Im Gegensatz zur Erkennung von Überlappten Sendungen über eine Detektion der Vorder- und Hinterkanten mit Hilfe von Lichtschranken werden erfindungsgemäß die überlappten Sendungen sehr frühzeitig und sicher mittels Messung der Sendungsgeschwindigkeit ermittelt.In the evaluation, an overlap detection occurs when the simultaneously measured velocities of the two sensors are different, the smaller measured velocity deviating from the greater velocity by a set value. In contrast to the detection of overlapping broadcasts via detection of the leading and trailing edges with the aid of light barriers, according to the invention, the overlapped transmissions are determined very early and reliably by measuring the transmission speed.

Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen dargelegt.Advantageous embodiments of the invention are set forth in the subclaims.

So ist es besonders vorteilhaft, als Sensoren zur Messung der Sendungsgeschwindigkeit auf den Sendungsoberflächen laufende, örtlich feste Rollen oder Bänder, deren Drehzahlen als Maß für die Sendungsgeschwindigkeit dienen, einzusetzen. Dadurch wird eine robuste und aufwandsarme Lösung erzielt.So it is particularly advantageous to use as sensors for measuring the speed of shipment on the broadcast surfaces running, locally fixed roles or bands whose speeds are used as a measure of the speed of shipment. This results in a robust and low-effort solution.

Um Ungenauigkeiten bei den Messungen infolge von Dehnungen der Sendungen bei den Beschleunigungen zu vermeiden, beginnt das Auswerten der Messergebnisse erst nach einer festgelegten Verzögerungszeit nach dem von einem Sensor gemessenen Geschwindigkeitssprung auf eine von der Nenngeschwindigkeit der nachfolgenden Transportstufe nur um einen festgelegten geringen Wert abweichende Geschwindigkeit.In order to avoid inaccuracies in the measurements due to expansions of the transmissions in the accelerations, the evaluation of the measurement results begins only after a fixed delay time after the speed jump measured by a sensor to a speed deviating from the nominal speed of the subsequent transport stage only by a predetermined low value.

Anschließend wird die Erfindung in einem Ausführungsbeispiel anhand der Zeichnung erläutert.Subsequently, the invention will be explained in an embodiment with reference to the drawing.

Dabei zeigen

FIG 1
eine schematische Draufsicht auf zwei Transportstufen und zwei dazwischen angeordneten Geschwindigkeitssensoren
FIG 2
eine schematische Draufsicht auf zwei Transportstufen, wobei sich am Beginn der zweiten Transportstufe zwei größere Andruckrollen befinden
Show
FIG. 1
a schematic plan view of two transport stages and two arranged therebetween speed sensors
FIG. 2
a schematic plan view of two transport stages, wherein there are two larger pressure rollers at the beginning of the second transport stage

In dem dargestellten Beispiel handelt es sich um den Transportpfad einer Vereinzelungseinrichtung, in der die flachen Sendungen 5.6 aus einem Stapel in mehreren Transportstufen 1,2 vereinzelt werden. In jeder nachfolgenden Stufe erfolgt eine Beschleunigung auf einen höheren Geschwindigkeitswert. Sobald die Sendung von der nachfolgenden Transportstufe 2 übernommen ist, wird die Geschwindigkeit der vorgelagerten Transportstufe 1 reduziert. Liegt eine Überlappung (Doppelabzug) vor, können dadurch zueinander etwas versetzte Sendungen 5,6 gegeneinander verschoben werden. In diesem Beispiel sind zwei Transportstufen 1,2 zum Beschleunigen vorgesehen, denen sich eine Transportstrecke mit höherer Nenngeschwindigkeit anschließt, die an ihrem Beginn zwei Übernahmerollen 7,8 aufweist. Dabei ist es notwendig, zu überwachen, ob und wie lange Überlappungen bestehen.In the illustrated example, it is the transport path of a separating device in which the flat items 5.6 are separated from a stack in several transport stages 1,2. In each subsequent stage, an acceleration takes place to a higher speed value. As soon as the consignment is taken over by the subsequent transport stage 2, the speed of the upstream Transport level 1 reduced. If there is an overlap (double take-off), consignments 5.6 offset from one another can thereby be shifted relative to one another. In this example, two transport stages 1, 2 are provided for acceleration, followed by a transport line with a higher nominal speed, which has two take-up rollers 7, 8 at its beginning. It is necessary to monitor if and how long overlaps exist.

Hierfür sind gemäß FIG 1, in der die beiden Transportstufen 1,2 der Vereinzelungseinrichtung dargestellt sind, zwischen beiden Transportstufen 1,2 beidseitig des Transportpfades zwei Sensoren 3,4 zur Messung der Geschwindigkeit der Sendungen angeordnet. Zu erkennen sind auch zwei teilweise. überlappte Sendungen 5,6, wobei sich die vordere Sendung 5 schon im Wirkungsbereich der vorgelagerten Transportstufe 2 befindet. Jeder Sensor 3,4 ist hier mittels einer auf der Sendungsoberfläche laufenden und einen Tachogenerator antreibenden Rolle realisiert. Das der Drehzahl entsprechende Ausgangssignal des Tachogenerators wird als Messsignal an eine Auswerteeinrichtung übertragen.For this purpose are according to FIG. 1 in which the two transport stages 1, 2 of the singling device are shown, two sensors 3 4 for measuring the speed of the shipments are arranged between both transport stages 1, 2 on both sides of the transport path. To recognize are also two partially. overlapped broadcasts 5.6, with the front 5 is already in the range of action of the upstream transport stage 2. Each sensor 3, 4 is realized here by means of a roller running on the conveyor surface and driving a tachogenerator. The output signal of the tachogenerator corresponding to the rotational speed is transmitted as a measuring signal to an evaluation device.

Tritt eine Sendung in den Übergang zwischen beiden Transportstufen 1,2 ein, werden die Geschwindigkeiten der Sensoren 3,4 überwacht. Ist die Differenz zwischen dem höchsten gemessenen Geschwindigkeitswert und der Geschwindigkeit der nachfolgenden Transportstufe 2 kleiner als ein definierter kleiner Grenzwert, geht man davon aus, dass die Sendung 3 von der Transportstufe 2 annähernd schlupffrei transportiert wird.If a shipment enters the transition between two transport stages 1, 2, the speeds of the sensors 3, 4 are monitored. If the difference between the highest measured speed value and the speed of the subsequent transport stage 2 is smaller than a defined small limit value, it is assumed that the shipment 3 is transported by the transport stage 2 almost without slippage.

Ab diesem Zeitpunkt werden die beiden Sensoren 3,4 überwacht. Ist die Differenz zwischen der kleinsten gemessenen Geschwindigkeit und der Geschwindigkeit der nachfolgenden Transportstufe 2 größer als ein definierter Grenzwert, so wird eine Überlappung detektiert, die sich an dem Übergang zwischen beiden Transportstufen 1,2 aufgrund der Geschwindigkeitsdifferenzen auseinanderzieht.From this point on, the two sensors 3,4 are monitored. If the difference between the smallest measured speed and the speed of the subsequent transport stage 2 is greater than a defined limit value, an overlap is detected which pulls apart at the transition between the two transport stages 1, 2 due to the speed differences.

Die Überwachung bleibt so lange aktiv, bis die letzte Hinterkante die Sensoren 3,4 verlassen hat.The monitoring remains active until the last trailing edge has left the sensors 3,4.

In FIG 2 ist der Übergangsbereich zwischen der Transportstufe 2 und den Übernahmerollen 7,8 der sich anschließenden Transportstrecke (beides bildet eine dritte Transportstufe), dargestellt. Beginnend mit den Übernahmerollen 7,8 sind die flachen Sendungen 5,6 in der als Deckbandsystem ausgeführten Transportstrecke schlupffrei gefasst und werden mit einer gegenüber der Transportstufe 2 erhöhten Geschwindigkeit weitertransportiert. Da die relativ großen Übernahmerollen 7,8 zur sicheren Übernahme der Sendungen 5,6 möglicht dicht an der Transportstufe 2 angeordnet sind, ist nicht genügend Platz vorhanden, um die Sensoren 9,10 dazwischen vorzusehen. Deshalb befinden sich die Sensoren 9,10 im Bereich der Transportstufe 2 in einem Abstand d kleiner als die kürzesten zu verarbeitenden Sendungen 5,6 von den Klemmstellen der Übernahmerollen 7,8.In FIG. 2 is the transition region between the transport stage 2 and the take-over rollers 7.8 of the subsequent transport route (both forms a third transport stage), shown. Starting with the take-over rollers 7, 8, the flat shipments 5, 6 are gripped without slippage in the transport path designed as a shroud system and are transported further with an increased speed relative to the transport step 2. Since the relatively large take-over rollers 7, 8 are arranged so that they can be safely taken over by the shipments 5, 6 close to the transport stage 2, there is not enough space to provide the sensors 9, 10 therebetween. Therefore, the sensors are 9,10 in the transport stage 2 at a distance d less than the shortest to be processed shipments 5.6 of the terminal points of the take-over rollers 7.8.

Tritt eine Sendung 5 in die Klemmstelle der Übernahmerollen 7,8 ein, z.B. mit einer Lichtschranke ermittelt, werden ab diesem Zeitpunkt die Sensoren 9,10 überwacht. Ist die Differenz zwischen der kleinsten gemessenen Geschwindigkeit und der Transportgeschwindigkeit der Übernahmerollen 7,8 größer als ein definierter Grenzwert, so wird ebenfalls eine Überlappung detektiert.When a mail item 5 enters the nip of take-up rollers 7, 8, e.g. determined with a light barrier, the sensors 9,10 are monitored from this point on. If the difference between the smallest measured speed and the transport speed of the take-up rollers 7, 8 is greater than a defined limit value, then an overlap is also detected.

Die Überwachung bleibt so lange aktiv, bis die Hinterkante die Sensoren 9,10 verlassen hat.The monitoring remains active until the trailing edge has left the sensors 9,10.

Zur Kompensation einer bei der Beschleunigung erlaubten Dehnung der Sendungen 5,6 kann die Überlappungsüberwachung mit Hilfe eines Timers kurzzeitig verzögert werden.In order to compensate for a stretch of the transmissions 5, 6 permitted during the acceleration, the overlap monitoring can be delayed for a short time with the aid of a timer.

Claims (5)

  1. Method for detecting overlapping flat mailpieces in a transport path for mailpieces that are transported vertically in succession, comprising the following steps:
    - arranging at least two transport stages (1, 2 or 2, 7, 8) successively in the transport path, the nominal speed of the following transport stage (2 or 7, 8) in the transport direction in each case being higher than the nominal speed of the transport stage (1 or 2) preceding it,
    - measuring the speed of the transported mailpieces (5, 6) by scanning said items in front of a following transport stage (2 or 7, 8) for a maximum distance that is shorter than the shortest agreed mailpiece length by means of two sensors (3, 4, 9, 10) that are arranged on either side of the transport path,
    - evaluating the measured results if a sensor (3, 4, 9, 10) measures a speed that deviates only slightly by a defined small value from the nominal speed of the following transport stage (2 or 7, 8),
    - detecting an overlap if the simultaneously measured speeds of the two sensors (3, 4 or 9, 10) are different and the smaller measured speed deviates from the greater speed by a defined value.
  2. Method according to claim 1, characterised in that the sensors (3, 4, 9, 10) for measuring the speed of the mailpieces are embodied as locally fixed rollers or belts running on the mailpiece surfaces, the rotational speeds of said rollers or belts serving as a measure for the speed of the mailpieces.
  3. Method according to claim 1, characterised in that the evaluation of the measured results does not start until after a specified delay time after the change in speed measured by a sensor (3, 4) to a speed deviating from the nominal speed of the following transport stage (2) only by a specified small value.
  4. Arrangement for detecting overlapping flat mailpieces in a transport path for mailpieces that are transported vertically in succession, having:
    - at least two transport stages (1, 2 or 2, 7, 8) in succession in the transport path, with the nominal speed of the following transport stage (2 or 7, 8) in the transport direction in each case being higher than the nominal speed of the transport stage (1 or 2) preceding it,
    - two sensors (3, 4, 9, 10) arranged on either side of the transport path for measuring the speed of the transported mailpieces (5, 6) by scanning said items in front of a following transport stage (2 or 7, 8) in each case for a maximum distance that is shorter than the shortest agreed mailpiece length, and
    - a device for evaluating the measured results if a sensor (3, 4, 9, 10) measures a speed that deviates from the nominal speed of the following transport stage (2, 7, 8) only by a defined small value, such that an overlap is detected if the simultaneously measured speeds of the two sensors (3, 4 or 9, 10) are different and the smaller measured speed deviates from the greater speed by a specified value.
  5. Arrangement according to claim 4, characterized in that the sensors (3, 4, 9, 10) for measuring the speed of the mailpieces are embodied as locally fixed rollers or belts running on the mailpiece surfaces, the rotational speeds of said rollers or belts serving as a measure for the speed of the mailpieces.
EP04798109A 2003-12-30 2004-11-27 Method and assembly for identifying overlapped flat mail items Expired - Fee Related EP1699719B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10361720A DE10361720B3 (en) 2003-12-30 2003-12-30 Process for identifying overlapped letters in a transport path for consecutively transported letters comprises arranging two transport stages behind each other
PCT/EP2004/013496 WO2005066052A1 (en) 2003-12-30 2004-11-27 Method and assembly for identifying overlapped flat mail items

Publications (2)

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EP1699719A1 EP1699719A1 (en) 2006-09-13
EP1699719B1 true EP1699719B1 (en) 2008-04-23

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EP04798109A Expired - Fee Related EP1699719B1 (en) 2003-12-30 2004-11-27 Method and assembly for identifying overlapped flat mail items

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US (1) US7347417B2 (en)
EP (1) EP1699719B1 (en)
JP (1) JP2007516911A (en)
KR (1) KR20060127956A (en)
CN (1) CN1902110A (en)
DE (2) DE10361720B3 (en)
WO (1) WO2005066052A1 (en)

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JP4217736B2 (en) * 2006-11-09 2009-02-04 シャープ株式会社 Sheet conveying apparatus, automatic document feeder comprising the sheet conveying apparatus, and image forming apparatus comprising the sheet conveying apparatus
JP4306732B2 (en) * 2007-01-26 2009-08-05 シャープ株式会社 Sheet conveying apparatus, automatic document feeder and image forming apparatus provided with the same
CN104411610B (en) * 2012-06-22 2016-12-28 下西技研工业株式会社 Overlapping feeding detection device and plate object processing means
CN105564884B (en) * 2016-02-01 2018-02-06 中国重型机械研究院股份公司 A kind of aluminium section bar stacking parting bead automatic transmitting method
CN107301720B (en) * 2017-07-13 2020-01-14 深圳怡化电脑股份有限公司 Medium processing device and automatic transaction device

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JPH0649536B2 (en) * 1986-01-07 1994-06-29 日本電気株式会社 2 feeding detection device
JPH0674102B2 (en) 1987-12-26 1994-09-21 富士通機電株式会社 Double feed detector
JPH0710322A (en) * 1993-06-25 1995-01-13 Toshiba Corp Paper sheet transfer device
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JPH0920438A (en) * 1995-07-06 1997-01-21 Nec Corp Double feed detecting device for paper sheet
DE19625044A1 (en) * 1996-06-22 1998-01-02 Siemens Ag Method for recognizing overlapping of flat items
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JP4364012B2 (en) * 2003-05-14 2009-11-11 株式会社東芝 Paper sheet double feed detection device and double feed detection method

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KR20060127956A (en) 2006-12-13
DE10361720B3 (en) 2005-05-25
EP1699719A1 (en) 2006-09-13
CN1902110A (en) 2007-01-24
JP2007516911A (en) 2007-06-28
US7347417B2 (en) 2008-03-25
WO2005066052A1 (en) 2005-07-21
US20070164507A1 (en) 2007-07-19
DE502004006960D1 (en) 2008-06-05

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