EP0813913A2 - Method for recognizing overlapping between flat mail objects - Google Patents

Method for recognizing overlapping between flat mail objects Download PDF

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Publication number
EP0813913A2
EP0813913A2 EP97108423A EP97108423A EP0813913A2 EP 0813913 A2 EP0813913 A2 EP 0813913A2 EP 97108423 A EP97108423 A EP 97108423A EP 97108423 A EP97108423 A EP 97108423A EP 0813913 A2 EP0813913 A2 EP 0813913A2
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EP
European Patent Office
Prior art keywords
height
diodes
mail items
transmitter
measured
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.)
Withdrawn
Application number
EP97108423A
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German (de)
French (fr)
Other versions
EP0813913A3 (en
Inventor
Stefan Werner Neumann
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.)
Siemens AG
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0813913A2 publication Critical patent/EP0813913A2/en
Publication of EP0813913A3 publication Critical patent/EP0813913A3/en
Withdrawn legal-status Critical Current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
    • 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
    • B07C1/00—Measures preceding sorting according to destination
    • B07C1/02—Forming articles into a stream; Arranging articles in a stream, e.g. spacing, orientating

Definitions

  • the invention relates to a method for detecting overlaps of flat mail items according to the preamble of patent claim 1.
  • movable mail items are temporarily deflected perpendicular to the conveyor.
  • the presence of overlapped mail items is then detected by evaluating the quick-response behavior of the mail items (DE-4337004). Since there may be a different offset of the overlapped mail items, the deflection must take place both on the front side of the mail item and on the back side of the mail item, which results in increased effort.
  • Another disadvantage is the mechanical stress on the mail items during the deflection.
  • Another shortcoming of this solution is that the offset of the rear edges must not be less than a minimum value (approx. 10 mm).
  • the present invention is therefore based on the object of providing a method for the detection of mail overlaps, with the aid of which a large part of the overlaps can be recognized without additional mechanical mail load with little effort.
  • the consignment height is measured with the aid of a light grid consisting of transmitter diodes and receiver diodes strung together.
  • the transmitter diodes and associated receiver diodes which do not influence one another, are evaluated simultaneously and in succession, taking into account the opening angle of the transmitter diodes.
  • the height of the consignment is measured with the aid of a light curtain in order to increase the resolution, in which height detection takes place via CCD lines.
  • a shipment SE is moved between a light grid consisting of transmitter diodes S and receiver diodes E.
  • the program SE darkens a certain number of light rays from the light grid. The distance d between the light beams is known.
  • the number of light beams interrupted by the program SE is then a measure of the height of the program SE. This measurement is repeated continuously while the consignment SE is being transported through the light grid. This gives you a height profile for the SE broadcast.
  • Each transmitter diode S has a typical opening angle ⁇ in which the light beams are emitted. Only the receiver diode E exactly opposite the respective transmitter diode S may recognize whether a shipment SE is at this height. The neighboring receiver diodes E would give a wrong height signal. For this reason, only those diode pairs with the same digits that do not influence each other are considered at the same time.
  • the evaluation begins with all 1-pairs. Then all pairs of 2, pairs of 3 etc. are evaluated up to the pairs of m. Then it starts again. All transmitter diodes S of the same designation are always switched on at the same time and the matching receiver diodes E are evaluated. Switching on the transmitter diodes S and reading the matching receiver diodes E must therefore be coordinated and coupled.
  • the time required to scan through is a measure of the resolution of the height profile of the shipment in the direction of the shipment.
  • the mail items are transported clamped between belts R. These belts R also cover the programs SE on the light curtain. Since the size of the mail items only varies within a defined tolerance range, it is advantageous to use two-part diode rows D. These diode line parts are arranged so that the expected different heights of the lower and upper edges of the item are detected.
  • the measured height is normally constant because a shipment SE has the shape of a rectangle. However, if there is an overlap as a result of a multiple deduction, in which the individual mail items SE lie on top of one another and are shifted in relation to one another in the height direction and possibly have different formats, a jump in height in the profile is registered and an overlap signal is generated.

Abstract

The method involves using an optical arrangement to measure the height of the separated letters (SE). If a sudden change in height is detected by the optical measurement system as the letters pass though under repeated height measurements an overlap warning is generated. The letter heights are measured using an optical grid consisting of successive transmission diodes (S) and receiver diodes (E). The aperture angles of the diodes are selected to enable simultaneous and successive evaluation without mutual interference.

Description

Die Erfindung bezieht sich auf ein Verfahren zum Erkennen von Überlappungen von flachen Sendungen gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a method for detecting overlaps of flat mail items according to the preamble of patent claim 1.

In Sendungsverteilanlagen kommt es immer wieder vor, daß die zu verarbeitenden flachen Sendungen nicht einzeln, sondern überlappt durch die Sendungsverteilanlage transportiert werden. Diese Überlappungen entstehen, wenn statt nur einer Sendung mehrere Sendungen gleichzeitig von der Stoffeingabe abgezogen werden. Man spricht in diesen Fällen von Doppel- oder Mehrfachabzügen. Eine Fehlverteilung ist dann fast unumgänglich. Deshalb müssen Überlappungen erkannt werden, um sie anschließend zur Vermeidung von Fehlverteilungen auszuschleusen.
Nach dem Stand der Technik kann man auf die Sendungen optisch abtastbare Spuren z.B. Striche, Barcodes oder andere Muster aufbringen. Sendungsüberlappungen werden durch optische Abtastung dieser Spuren ermittelt. Liegt eine Überlappung vor, so fehlen Teilstriche, Liniensprünge treten auf oder der Code ist länger als normal. Dieses Verfahren ist aber nur in den Fällen einsetzbar, in denen trotz Überlappung beide Spuren lesbar sind.
Bei einer anderen bekannten Lösung werden bewegbare Sendungsteile temporär senkrecht zur Fördervorrichtung ausgelenkt. Durch Auswertung des Rückschnellverhaltens der Sendungen wird dann das Vorliegen von überlappten Sendungen detektiert (DE-4337004). 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. 10mm) nicht unterschreiten darf.It often happens in mail distribution systems that the flat mail items to be processed are not transported individually but overlapped by the mail distribution system. These overlaps occur when, instead of just one shipment, several shipments are deducted from the substance input at the same time. In these cases one speaks of double or multiple deductions. An incorrect distribution is then almost inevitable. Overlaps must therefore be recognized so that they can then be discharged to avoid incorrect distributions.
According to the prior art, optically scannable tracks, for example bars, barcodes or other patterns, can be applied to the mailings. Consignment overlaps are determined by optical scanning of these tracks. If there is an overlap, tick marks are missing, line jumps occur or the code is longer than normal. However, this method can only be used in cases where both tracks can be read despite the overlap.
In another known solution, movable mail items are temporarily deflected perpendicular to the conveyor. The presence of overlapped mail items is then detected by evaluating the quick-response behavior of the mail items (DE-4337004). Since there may be a different offset of the overlapped mail items, the deflection must take place both on the front side of the mail item and on the back side of the mail item, which results in increased effort. Another disadvantage is the mechanical stress on the mail items during the deflection. Another shortcoming of this solution is that the offset of the rear edges must not be less than a minimum value (approx. 10 mm).

Die vorliegende Erfindung liegt daher die Aufgabe zugrunde ein Verfahren zur Detektion von Sendungsüberlappungen zu schaffen, mit dessen Hilfe bei geringem Aufwand ein Großteil der Überlappungen ohne zusätzliche mechanische Sendungsbeanspruchung erkannt wird.The present invention is therefore based on the object of providing a method for the detection of mail overlaps, with the aid of which a large part of the overlaps can be recognized without additional mechanical mail load with little effort.

Erfindungsgemäß wird diese Aufgabe durch die Merkmale des Patentanspruches 1 gelöst.According to the invention, this object is achieved by the features of patent claim 1.

Hierbei wird davon ausgegangen, daß ein Großteil der überlappten Sendungen nicht deckungsgleich aufeinanderliegt, sondern zu einander senkrecht zur Transportrichtung verschoben ist bzw. unterschiedliche Höhe aufweist. Dies äußert sich bei der Messung der Sendungshöhe in einem Höhensprung. Der Höhensprung kann dabei bei der Oberkante und/oder der Unterkante der Sendungen auftreten.It is assumed here that a large part of the overlapped mail items do not lie congruently on one another, but rather are shifted perpendicular to one another or have different heights. This manifests itself in the measurement of the shipment height in a jump in height. The jump in height can occur at the top edge and / or the bottom edge of the mail items.

In einer vorteilhaften Ausführung gemäß Patentanspruch 2 wird die Sendungshöhe mithilfe eines Lichtgitters, bestehend aus aneinandergereihten Senderdioden und Empfängerdioden, gemessen.In an advantageous embodiment according to claim 2, the consignment height is measured with the aid of a light grid consisting of transmitter diodes and receiver diodes strung together.

Zur Minimierung der Durchscannzeit eines Zyklusses und damit zur Erhöhung der Auflösung bei der Ermittlung des Höhenprofils werden nach Patentanspruch 3 in vorteilhafter Weise unter Beachtung des Öffnungswinkels der Senderdioden die Senderdioden und zugehörigen Empfängerdioden gleichzeitig und nacheinander ausgewertet, die sich nicht gegenseitig beeinflussen.In order to minimize the scanning time of a cycle and thus to increase the resolution when determining the height profile, the transmitter diodes and associated receiver diodes, which do not influence one another, are evaluated simultaneously and in succession, taking into account the opening angle of the transmitter diodes.

Nach einer weiteren vorteilhaften Angestaltung der Erfindung entsprechend Patentanspruch 4 wird zur Erhöhung der Auflösung die Sendungshöhe mithilfe eines Lichtvorhanges gemessen, bei dem Höhenerkennung über CCD-Zeilen erfolgt.According to a further advantageous embodiment of the invention according to claim 4, the height of the consignment is measured with the aid of a light curtain in order to increase the resolution, in which height detection takes place via CCD lines.

Nachfolgend wird die Erfindung anhand eines Ausführungsbeispiel unter Bezugnahme auf die Zeichnungen näher erläutert.The invention is explained in more detail below using an exemplary embodiment with reference to the drawings.

Dabei zeigen

Fig. 1
ein Lichtgitter, bestehend aus in vertikaler Richtung aneinandergereihten Sender- und Empfängerdioden
Fig. 2
ein Lichtgitter im Sendungslauf mit unterbrochener Aneinanderreihung.
Show
Fig. 1
a light grid consisting of transmitter and receiver diodes lined up in a vertical direction
Fig. 2
a light grid in the program run with an interrupted sequence.

Eine Sendung SE wird zwischen ein Lichtgitter, bestehend aus Senderdioden S und Empfängerdioden E, hindurchbewegt.
Die Sendung SE verdunkelt dabei eine bestimmte Anzahl der Lichtstrahlen des Lichtgitters. Der Abstand d zwischen den Lichtstrahlen ist bekannt. Die Anzahl der durch die Sendung SE unterbrochenen Lichtstrahlen ist dann ein Maß für die Höhe der Sendung SE.
Diese Messung wird, während die Sendung SE durch das Lichtgitter transportiert wird, ständig wiederholt. Dadurch erhält man ein Höhenprofil der Sendung SE.A shipment SE is moved between a light grid consisting of transmitter diodes S and receiver diodes E.
The program SE darkens a certain number of light rays from the light grid. The distance d between the light beams is known. The number of light beams interrupted by the program SE is then a measure of the height of the program SE.
This measurement is repeated continuously while the consignment SE is being transported through the light grid. This gives you a height profile for the SE broadcast.

Jede Senderdiode S hat einen typischen Öffnungswinkel µ, in dem die Lichtstrahlen emittiert werden. Nur die der jeweiligen Senderdiode S genau gegenüberliegende Empfängerdiode E darf erkennen, ob sich eine Sendung SE in dieser Höhe befindet. Die benachbarten Empfängerdioden E würden ein falsches Höhensignal ergeben. Deshalb werden nur die Diodenpaare mit gleichen Ziffern gleichzeitig betrachtet, die sich nicht gegenseitig beeinflussen.Each transmitter diode S has a typical opening angle μ in which the light beams are emitted. Only the receiver diode E exactly opposite the respective transmitter diode S may recognize whether a shipment SE is at this height. The neighboring receiver diodes E would give a wrong height signal. For this reason, only those diode pairs with the same digits that do not influence each other are considered at the same time.

Die Auswertung beginnt mit allen 1er-Paaren. Danach werden alle 2er-Paare, 3er-Paare usw. bis zu den m-er Paaren ausgewertet. Anschließend wird wieder von vorn begonnen. Es werden hierbei immer alle Senderdioden S gleicher Bezeichnung gleichzeitig eingeschaltet und die dazu passenden Empfängerdioden E ausgewertet. Das Einschalten der Senderdioden S und Lesen der dazu passenden Empfängerdioden E muß daher aufeinander abgestimmt und gekoppelt geschehen. Die benötigte Zeit zum Durchscannen ist ein Maß für die Auflösung des Höhenprofils der Sendung in Sendungslaufrichtung. Wie der Fig. 2 zu entnehmen ist, werden die Sendungen zwischen Riemen R eingeklemmt transportiert. Diese Riemen R verdecken auch die Sendungen SE am Lichtvorhang.
Da die Größe der Sendungen auch nur in einem festgelegten Toleranzbereich variiert, ist es vorteilhaft, zweigeteilte Diodenzeilen D einzusetzen. Diese Diodenzeilenteile sind so angeordnet, daß die erwarteten unterschiedlichen Höhen der Sendungsunter- und - oberkanten erfaßt werden.The evaluation begins with all 1-pairs. Then all pairs of 2, pairs of 3 etc. are evaluated up to the pairs of m. Then it starts again. All transmitter diodes S of the same designation are always switched on at the same time and the matching receiver diodes E are evaluated. Switching on the transmitter diodes S and reading the matching receiver diodes E must therefore be coordinated and coupled. The time required to scan through is a measure of the resolution of the height profile of the shipment in the direction of the shipment. As can be seen from FIG. 2, the mail items are transported clamped between belts R. These belts R also cover the programs SE on the light curtain.
Since the size of the mail items only varies within a defined tolerance range, it is advantageous to use two-part diode rows D. These diode line parts are arranged so that the expected different heights of the lower and upper edges of the item are detected.

Die gemessene Höhe ist normalerweise konstant, da eine Sendung SE die Form eines Rechteckes hat. Liegt jedoch infolge eines Mehrfachabzuges eine Überlappung vor, bei der die einzelnen Sendungen SE aufeinander liegen und zueinander in Höhenrichtung verschoben sind sowie evtl. unterschiedliche Formate aufweisen, so wird ein Höhensprung im Profil registriert und ein Überlappungssignal erzeugt.The measured height is normally constant because a shipment SE has the shape of a rectangle. However, if there is an overlap as a result of a multiple deduction, in which the individual mail items SE lie on top of one another and are shifted in relation to one another in the height direction and possibly have different formats, a jump in height in the profile is registered and an overlap signal is generated.

Claims (4)

Verfahren zum Erkennen von Überlappungen von flachen Sendungen unter Verwendung von optischen Meßmitteln zum Messen der Sendungshöhe der vereinzelten Sendungen
dadurch gekennzeichnet,
daß bei einem ermittelten Höhensprung während der Durchlaufens der Sendungen durch das optische Meßsystem und wiederholten Höhenmessung eine Überlappung gemeldet wird.Method for recognizing overlaps of flat mail items using optical measuring means for measuring the mail item height of the individual mail items
characterized,
that an overlap is reported in the event of a determined jump in height during the passage of the mail items through the optical measuring system and repeated height measurement. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß die Sendungshöhe mithilfe eines Lichtgitters, bestehend aus aneinandergereihten Senderdioden und Empfängerdioden, gemessen wird.Method according to claim 1,
characterized,
that the shipment height is measured using a light grid consisting of transmitter diodes and receiver diodes strung together. Verfahren nach Anspruch 1 und 2,
dadurch gekennzeichnet,
daß unter Beachtung der Öffnungswinkel der Senderdioden die Senderdioden und zugehörigen Empfängerdioden gleichzeitig und nacheinander ausgewertet werden, die sich nicht gegenseitig beeinflussen.Method according to claims 1 and 2,
characterized,
that, taking into account the opening angle of the transmitter diodes, the transmitter diodes and associated receiver diodes are evaluated simultaneously and in succession, which do not influence one another. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß die Sendungshöhe mithilfe eines Lichtvorhanges gemessen wird, bei dem die Höhenerkennung über CCD-Zeilen erfolgt.Method according to claim 1,
characterized,
that the consignment height is measured using a light curtain, in which the height is detected via CCD lines.
EP97108423A 1996-06-22 1997-05-24 Method for recognizing overlapping between flat mail objects Withdrawn EP0813913A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19625044 1996-06-22
DE1996125044 DE19625044A1 (en) 1996-06-22 1996-06-22 Method for recognizing overlapping of flat items

Publications (2)

Publication Number Publication Date
EP0813913A2 true EP0813913A2 (en) 1997-12-29
EP0813913A3 EP0813913A3 (en) 1999-01-20

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6817610B2 (en) 2001-12-03 2004-11-16 Siemens Aktiengesellschaft Multiples detect apparatus and method
EP3530360A1 (en) * 2018-02-21 2019-08-28 Siemens Aktiengesellschaft Detection of non-conveyable mail items

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10142331C1 (en) * 2001-08-30 2003-03-27 Siemens Dematic Ag Method and arrangement for detecting overlaps
DE10307770B4 (en) * 2003-02-14 2005-05-04 Visolux Zweigniederlassung Der Pepperl + Fuchs Gmbh Method for operating a light grid for monitoring geometric features of a material web
DE10310546B3 (en) * 2003-03-11 2004-08-26 Siemens Ag Sorting system for letters or flat packages has singling system with detector for single and multiple groups of letters followed by sorting station
DE10361720B3 (en) * 2003-12-30 2005-05-25 Siemens Ag Process for identifying overlapped letters in a transport path for consecutively transported letters comprises arranging two transport stages behind each other

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FR2576528A1 (en) * 1985-01-30 1986-08-01 Hotchkiss Brandt Sogeme Processing method for the separating of objects
US4733226A (en) * 1986-01-07 1988-03-22 Nec Corporation Overlapped-transfer detecting apparatus for mail article
US5015840A (en) * 1990-01-09 1991-05-14 Scientific Technologies Incorporated Self-checking light curtain system and method of operation
US5331151A (en) * 1993-01-25 1994-07-19 Pressco Technology, Inc. Multiple envelope detector

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US4576287A (en) * 1982-09-10 1986-03-18 Omation Corporation Apparatus and method for checking the contents of envelopes and sorting documents by thickness
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Publication number Priority date Publication date Assignee Title
EP0167091A1 (en) * 1984-07-03 1986-01-08 Licentia Patent-Verwaltungs-GmbH Separating device for flat articles
FR2576528A1 (en) * 1985-01-30 1986-08-01 Hotchkiss Brandt Sogeme Processing method for the separating of objects
US4733226A (en) * 1986-01-07 1988-03-22 Nec Corporation Overlapped-transfer detecting apparatus for mail article
US5015840A (en) * 1990-01-09 1991-05-14 Scientific Technologies Incorporated Self-checking light curtain system and method of operation
US5015840B1 (en) * 1990-01-09 1995-04-11 Scient Technologies Inc Self-checking light curtain system and method of operation.
US5331151A (en) * 1993-01-25 1994-07-19 Pressco Technology, Inc. Multiple envelope detector

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6817610B2 (en) 2001-12-03 2004-11-16 Siemens Aktiengesellschaft Multiples detect apparatus and method
EP3530360A1 (en) * 2018-02-21 2019-08-28 Siemens Aktiengesellschaft Detection of non-conveyable mail items
WO2019161983A1 (en) * 2018-02-21 2019-08-29 Siemens Aktiengesellschaft Detecting non-handleable items
CN111757783A (en) * 2018-02-21 2020-10-09 西门子股份公司 Identification of non-transportable objects

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Publication number Publication date
DE19625044A1 (en) 1998-01-02
EP0813913A3 (en) 1999-01-20

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