EP1045733B1 - Method for controlling a device used to remove packages from a pile - Google Patents

Method for controlling a device used to remove packages from a pile Download PDF

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Publication number
EP1045733B1
EP1045733B1 EP99930887A EP99930887A EP1045733B1 EP 1045733 B1 EP1045733 B1 EP 1045733B1 EP 99930887 A EP99930887 A EP 99930887A EP 99930887 A EP99930887 A EP 99930887A EP 1045733 B1 EP1045733 B1 EP 1045733B1
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EP
European Patent Office
Prior art keywords
mail
sensor
item
items
speed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP99930887A
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German (de)
French (fr)
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EP1045733A1 (en
Inventor
Hauke LÜBBEN
Eckehardt Grimm
Frank Gerstenberg
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Siemens AG
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Siemens AG
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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
    • 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
    • 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
    • B65H2301/40—Type of handling process
    • B65H2301/44—Moving, forwarding, guiding material
    • B65H2301/445—Moving, forwarding, guiding material stream of articles separated from each other
    • B65H2301/4452—Regulating space between separated articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/20—Location in space
    • B65H2511/22—Distance
    • 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

Definitions

  • the invention relates to a method and an apparatus for Control of the deduction according to the generic term of the independent Claims.
  • the trigger element is driven to deduct a shipment such that the distance between the deductible shipment and an already deducted shipment is determined and the respective distance measurement result by one Default value, that of the acceleration path of the to be subtracted Subject is corrected, and being the deduction is triggered when the size of the distance measurement result corrected in this way corresponds to a distance setpoint.
  • a trigger device is disclosed in US-A-4,541,624 described, with the shipments on the lower edge deducted upwards, i.e. the different Consignment lengths must be taken into account.
  • Deduction and Correction tools are constantly driven, but with different fixed speeds, their respective Duration is determined. No determination is made here the actual distance of the consignment to be deducted from the deducted Consignment made. This distance is only calculated after the consignment to be deducted has already been deducted, i.e. Defined shipment intervals cannot be saved.
  • the invention specified in the independent claims the problem is therefore based on a method and a Device for withdrawing flat items from a stack to create those lined up without a measuring section Sensors for the detection of the consignments control the deduction that an optimal minimum gap for further processing of the mailings between the shipments.
  • the distance between the withdrawn consignments must no longer be constant to be deducted from the shipment to be measured at the time to accelerate the shipment to be deducted. Rather, it determines the speed at which the consignment to be deducted from when the first sensor is reached must be transported to the second sensor to get the desired one To achieve the target gap, i.e. a sensor line is not more necessary.
  • FIG. 1 shows a preferred embodiment of an inventive Contraption. It is fixed, but free rotatably provided a shaft 20 on which a roller 21 is attached is.
  • the shaft 20 also serves for pivotable mounting a rocker 22, the axis 23 of another role 24 wears.
  • Around the roller 21 and the take-off roller 24 is as a separating member guided at least one take-off belt 25, the Outer surface has a high coefficient of friction.
  • the rocker 22 is by a schematically indicated spring 26 supported so that their respective position from the pressing force depends on the batch of items, the first of which Shipment 1 'is shown when it is deducted.
  • the free end of the Swing arm 22 acts on a microswitch, not shown on. If the pressure of the stack is too low, then includes a normally closed contact of the microswitch, thereby gear motor, not shown, is switched on. This drives a retaining wall towards the end of the stack the take-off roller 24 until after reaching the intended Pressure force corresponding position of the swing arm Switches off the normally closed contact again.
  • the shaft 20 is driven by a servo motor, not shown controllable driven in the direction of the arrow.
  • the in the conveying direction pointing edges, i.e. the leading edges of the in the stack consignments are more or less close to each other a stop wall 40, the one to the trigger tape 25 Passage of the mailings enabling gap, that is, the stack exit leaves free.
  • Conveyor rollers 43 and 44 are arranged through which the shipments will be forcibly promoted once they are in their Detection area are reached.
  • These conveyor rollers serve here as deflection rollers of conveyor belts 48 and 49 in the conveying direction are guided around further deflection rollers 50 and 51.
  • the driven conveyor roller 43 is fixed, the conveyor roller 44 is compliant in a known manner, e.g. mounted on a swiveling lever, but what in the Drawing is not shown for the sake of simplicity.
  • This light barrier 71/71 ' is located so far behind the stop wall 40 that the shipments reached a medium take-off speed at this point to have. This average pull-off speed is with the help statistical data set so that the necessary speed changes to carry out occurring Changes in gaps are as small as possible.
  • the distance between the light barriers is chosen so large that at specified maximum speed change the largest necessary gap changes can be realized.
  • These light barrier signals are one of the microprocessor Control circuit 60 evaluated. From the light / dark signals the light barriers are the respective positions of the shipments 1 'and 1 "determined.
  • FIG. 2 shows a simplified representation in which a number of mail items is arranged in a stack 100.
  • the trigger motor is switched on and the first program started. Reaches the front edge of the second light barrier 73/73 ', the trigger motor is stopped immediately, the shipment is further subtracted from the conveyor belts 48 and 49. The trigger motor is only switched on again when the following Condition is fulfilled: the first light barrier 71/71 'is bright.
  • the trigger motor is started again to the next one Speed up shipment.
  • the speed v can be determined with which the Consignment until the second light barrier 73/73 'is reached must be transported further to achieve this exactly the distance between the target gap and the previously deducted item to have. So there is no interim stopping of the Broadcast.

Landscapes

  • Controlling Sheets Or Webs (AREA)
  • Sorting Of Articles (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Steuerung des Abzugs gemäß dem Oberbegriff der unabhängigen Patentansprüche.The invention relates to a method and an apparatus for Control of the deduction according to the generic term of the independent Claims.

Der Abzug der jeweils vordersten Sendungen aus einem Sendungsstapel muß unter Einhaltung einer vorgegebenen Mindestlücke erfolgen. Diese Mindestlücke soll nicht unterschritten werden, um den nachfolgenden Anlagenteilen die Bearbeitung der einzelnen Sendungen zu ermöglichen. Gleichzeitig soll die erreichte mittlere Lücke die Mindestlücke möglichst wenig überschreiten, um einen hohen Sendungsdurchsatz zu erzielen.The deduction of the foremost items from a batch of items must comply with a predetermined minimum gap respectively. This minimum gap should not be undercut to the subsequent parts of the plant of the individual programs. At the same time, the middle gap reached the minimum gap as little as possible exceeded in order to achieve a high shipment throughput.

Aus der EP 0 167 091 A1, entspricht der DE 34 24 397 A1 und der DE 196 07 304 C1, sind Vorrichtungen zum Abzug von flachen Sendungen von einem Stapel bekannt. Diese Vorrichtungen weisen ein gesteuertes Abzugsorgan auf, das die jeweils vorderste Sendung eines Stapels abzieht und in den Erfassungsbereich eines Paares von angetriebenen Förderrollen vorschiebt, wobei zwischen dem Stapelausgang und den Förderrollen eine Meßstrecke in Form einer Lichtschrankenzeile angeordnet ist, deren Ausgangssignale einer Steuerschaltung zugeführt werden. Bei der EP 0 167 091 A1 erfolgt der Antrieb des Abzugsorgans zum Abzug einer Sendung derart, daß der Abstand zwischen der abzuziehenden Sendung und einer bereits abgezogenen Sendung ermittelt wird und das jeweilige Abstands-Meßergebnis um einen Vorgabewert, der vom Beschleunigungsweg des abzuziehenden Gegenstandes abhängig ist, korrigiert wird, und wobei der Abzug ausgelöst wird, wenn die Größe des so korrigierten Abstands-Meßergebnisses einem Abstands-Sollwert entspricht. From EP 0 167 091 A1, corresponds to DE 34 24 397 A1 and DE 196 07 304 C1, devices for the deduction of flat Shipments known from a batch. These devices have a controlled trigger, which is the foremost Consignment of a stack deducts and into the detection area of a pair of driven conveyor rollers, one between the stack exit and the conveyor rollers Measuring section is arranged in the form of a light barrier line, whose output signals are fed to a control circuit. In EP 0 167 091 A1, the trigger element is driven to deduct a shipment such that the distance between the deductible shipment and an already deducted shipment is determined and the respective distance measurement result by one Default value, that of the acceleration path of the to be subtracted Subject is corrected, and being the deduction is triggered when the size of the distance measurement result corrected in this way corresponds to a distance setpoint.

Dabei ermöglicht die Verwendung des Vorgabewertes die Berücksichtigung unterschiedlicher mechanischer Eigenschaften der verschiedenen Sendungen und deren Auswirkung beim Beschleunigugsvorgang.The use of the default value enables consideration different mechanical properties of the various shipments and their impact on the acceleration process.

Ein unterschiedliches Verhalten der Sendungen beim Abzugsvorgang resultiert auch aus der unterschiedlichen Lage der Sendungen im Stapel, von dem die Sendungen abgezogen werden. Dies hat ebenfalls unterschiedliche Lücken zur Folge, wodurch Durchsatz-Einbußen entstehen.Different behavior of the consignments during the deduction process also results from the different location of the programs in the stack from which the shipments are deducted. This also results in different gaps, which means Throughput losses occur.

Zur genaueren Lückensteuerung wird deshalb gemäß DE 196 07 304 C1 die abzuziehende Sendung zunächst auf einen Zwischengeschwindigkeitswert beschleunigt, der geringer ist als eine vorgegebene Endgeschwindigkeit. Sobald der Ist-Abstand gleich dem Soll-Abstand ist, wird die Sendung.auf die Endgeschwindigkeit beschleunigt.For more precise gap control is therefore according to DE 196 07 304 C1 the consignment to be deducted first on one Intermediate speed value accelerated, which is lower as a given top speed. As soon as the actual distance the consignment is equal to the target distance Top speed accelerates.

Diese bekannten Lösungen benötigen eine aufwendige Meßstrecke in Form einer Lichtschrankenzeile, mit der sowohl die Position der abgezogenen Sendung (Hinterkante, solange sie sich noch innerhalb der Meßstrecke befindet) als auch die der nächsten abzuziehenden Sendung (Vorderkante) laufend erfaßt wird, um die richtigen Zeitpunkte zur Beschleunigung der abzuziehenden Sendung zu ermitteln.These known solutions require a complex measuring section in the form of a light barrier line with which both the position the deducted consignment (trailing edge as long as it remains is still within the measuring section) as well as that of next consignment to be deducted (leading edge) continuously recorded at the right times to accelerate the deductible To determine shipment.

Darüber hinaus wird in der US-A-4 541 624 eine Abzugseinrichtung beschrieben, bei der die Sendungen auf der unteren Kante stehend nach oben abgezogen werden, d.h. die unterschiedlichen Sendungslängen müssen berücksichtigt werden. Abzugs- und Korrekturmittel werden ständig angetrieben, allerdings mit unterschiedlichen festen Geschwindigkeiten, deren jeweilige Zeitdauer ermittelt wird. Es wird hierbei keine Ermittlung des Ist-Abstandes der abzuziehenden Sendung von der abgezogenen Sendung vorgenommen. Dieser Abstand wird erst berechnet, nachdem die abzuziehende Sendung bereits abgezogen ist, d.h. definierte Sendungsabstände können nicht gesichert werden.In addition, a trigger device is disclosed in US-A-4,541,624 described, with the shipments on the lower edge deducted upwards, i.e. the different Consignment lengths must be taken into account. Deduction and Correction tools are constantly driven, but with different fixed speeds, their respective Duration is determined. No determination is made here the actual distance of the consignment to be deducted from the deducted Consignment made. This distance is only calculated after the consignment to be deducted has already been deducted, i.e. Defined shipment intervals cannot be saved.

Der in den unabhängigen Ansprüchen angegebenen Erfindung liegt deshalb das Problem zugrunde, ein Verfahren und eine Vorrichtung zum Abzug von flachen Sendungen von einem Stapel zu schaffen, die ohne eine Meßstrecke aus aneinandergereihten Sensoren zur Detektierung der Sendungen den Abzug so steuern, daß eine zur Weiterverarbeitung der Sendungen optimale Mindestlücke zwischen den Sendungen eingehalten wird. The invention specified in the independent claims the problem is therefore based on a method and a Device for withdrawing flat items from a stack to create those lined up without a measuring section Sensors for the detection of the consignments control the deduction that an optimal minimum gap for further processing of the mailings between the shipments.

Dabei muß nicht mehr laufend der Abstand der abgezogenen Sendung zur abzuziehenden Sendung gemessen werden, um den Zeitpunkt zur Beschleunigung der abzuziehenden Sendung zu bestimmen. Es wird vielmehr die Geschwindigkeit ermittelt, mit der die abzuziehende Sendung ab Erreichen des ersten Sensors bis zum zweiten Sensor transportiert werden muß, um die gewünschte Soll-Lücke zu erreichen, d.h. eine Sensorzeile ist nicht mehr notwendig.The distance between the withdrawn consignments must no longer be constant to be deducted from the shipment to be measured at the time to accelerate the shipment to be deducted. Rather, it determines the speed at which the consignment to be deducted from when the first sensor is reached must be transported to the second sensor to get the desired one To achieve the target gap, i.e. a sensor line is not more necessary.

Vorteilhafte Ausführungen der Erfindung sind in den abhängigen Ansprüchen angegeben.Advantageous embodiments of the invention are in the dependent Claims specified.

Anschließend wird die Erfindung anhand von Zeichnungen näher erläutert. Dabei zeigen

FIG 1
eine erfindungsgemäße Vorrichtung,
FIG 2
eine vereinfachte Darstellung einer erfindungsgemäßen Vorrichtung, bei der der Stapel, von dem die Sendungen abzuziehen sind, dargestellt ist.
The invention is then explained in more detail with reference to drawings. Show
FIG. 1
a device according to the invention,
FIG 2
a simplified representation of a device according to the invention, in which the stack from which the mail items are to be drawn is shown.

FIG 1 zeigt ein bevorzugtes Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung. Dabei ist fest gelagert, aber frei drehbar eine Welle 20 vorgesehen, auf der eine Rolle 21 befestigt ist. Die Welle 20 dient außerdem zur schwenkbaren Lagerung einer Schwinge 22, die die Achse 23 einer weiteren Rolle 24 trägt. Um die Rolle 21 und die Abzugsrolle 24 ist als Vereinzelungsorgan mindestens ein Abzugsband 25 geführt, dessen Außenfläche einen hohen Reibwert aufweist.1 shows a preferred embodiment of an inventive Contraption. It is fixed, but free rotatably provided a shaft 20 on which a roller 21 is attached is. The shaft 20 also serves for pivotable mounting a rocker 22, the axis 23 of another role 24 wears. Around the roller 21 and the take-off roller 24 is as a separating member guided at least one take-off belt 25, the Outer surface has a high coefficient of friction.

Die Schwinge 22 ist durch eine schematisch angedeutete Feder 26 abgestützt, so daß ihre jeweilige Stellung von der Andruckkraft des Sendungsstapels abhängt, von dem die vorderste Sendung 1' bei ihrem Abzug gezeigt ist. Das freie Ende der Schwinge 22 wirkt auf einen nicht gezeigten Mikroschalter ein. Ist die Andruckkraft des Stapels zu gering, dann schließt ein Ruhekontakt des Mikroschalters, wodurch ein nicht gezeigter Getriebemotor eingeschaltet wird. Dieser treibt am Stapelende eine Stützwand so lange in Richtung auf die Abzugsrolle 24 an, bis nach Erreichen der der vorgesehenen Andruckkraft entsprechenden Stellung der Schwinge der genannte Ruhekontakt wieder ausschaltet.The rocker 22 is by a schematically indicated spring 26 supported so that their respective position from the pressing force depends on the batch of items, the first of which Shipment 1 'is shown when it is deducted. The free end of the Swing arm 22 acts on a microswitch, not shown on. If the pressure of the stack is too low, then includes a normally closed contact of the microswitch, thereby gear motor, not shown, is switched on. This drives a retaining wall towards the end of the stack the take-off roller 24 until after reaching the intended Pressure force corresponding position of the swing arm Switches off the normally closed contact again.

Die Welle 20 wird durch einen nicht dargestellten Servo-Motor steuerbar in Richtung des Pfeiles angetrieben. Die in Förderrichtung weisenden Kanten, d.h. die Vorderkanten der im Stapel befindlichen Sendungen liegen mehr oder weniger dicht an einer Anschlagwand 40 an, die zum Abzugsband 25 einen den Durchtritt der Sendungen ermöglichenden Spalt, also den Stapelausgang freiläßt.The shaft 20 is driven by a servo motor, not shown controllable driven in the direction of the arrow. The in the conveying direction pointing edges, i.e. the leading edges of the in the stack consignments are more or less close to each other a stop wall 40, the one to the trigger tape 25 Passage of the mailings enabling gap, that is, the stack exit leaves free.

Im Förderweg der Sendungen ist ein Paar von dauernd angetriebenen Förderrollen 43 und 44 angeordnet, durch die die Sendungen zwangsweise weitergefördert werden, sobald sie in ihren Erfassungsbereich gelangt sind. Diese Förderrollen dienen hier als Umlenkrollen von Förderriemen 48 und 49, die in Förderrichtung um weitere Umlenkrollen 50 und 51 geführt sind. Während die angetriebene Förderrolle 43 fest gelagert ist, ist die Förderrolle 44 in bekannter Weise nachgiebig, z.B. auf einem schwenkbaren Hebel, gelagert, was aber in der Zeichnung der Einfachheit halber nicht dargestellt ist.In the conveyance path of the shipments there is a pair of continuously driven ones Conveyor rollers 43 and 44 are arranged through which the shipments will be forcibly promoted once they are in their Detection area are reached. These conveyor rollers serve here as deflection rollers of conveyor belts 48 and 49 in the conveying direction are guided around further deflection rollers 50 and 51. While the driven conveyor roller 43 is fixed, the conveyor roller 44 is compliant in a known manner, e.g. mounted on a swiveling lever, but what in the Drawing is not shown for the sake of simplicity.

Entlang des Förderweges der Sendungen ist anschließend an eine Anschlagwand 40 eine erste Lichtschranke 71/71' als Sensor zur Sendungsdetektion angeordnet, deren Lichtempfänger mit dem Bezugszeichen 71 und deren zugehörige Lichtquelle mit 71' bezeichnet ist. Als Lichtempfänger werden Fotodioden oder Fototransistoren verwendet. Diese Lichtschranke 71/71' befindet sich soweit hinter der Anschlagwand 40, daß die Sendungen an dieser Stelle eine mittlere Abzugsgeschwindigkeit erreicht haben. Diese mittlere Abzugsgeschwindigkeit wird mit Hilfe statistischer Daten so festgelegt, daß die notwendigen Geschwindigkeitsänderungen zur Durchführung von auftretenden Lückenänderungen möglichst gering sind.Along the path of the consignments is then to one Stop wall 40 a first light barrier 71/71 'as a sensor arranged for shipment detection, the light receiver with the reference numeral 71 and its associated light source with 71 ' is designated. Photodiodes or phototransistors are used as light receivers used. This light barrier 71/71 'is located so far behind the stop wall 40 that the shipments reached a medium take-off speed at this point to have. This average pull-off speed is with the help statistical data set so that the necessary speed changes to carry out occurring Changes in gaps are as small as possible.

Außerdem ist eine den Erfassungsbereich der Förderrollen 43 und 44 überwachende zweite Lichtschranke 73/73' mit einer Lichtquelle 73' vorgesehen.In addition, one is the detection area of the conveyor rollers 43 and 44 monitoring second light barrier 73/73 'with one Light source 73 'is provided.

Der Abstand der Lichtschranken wird so groß gewählt, daß bei festgelegter maximaler Geschwindigkeitsänderung die größten notwendigen Lückenänderungen realisiert werden können.The distance between the light barriers is chosen so large that at specified maximum speed change the largest necessary gap changes can be realized.

Diese Lichtschrankensignale werden von dem Mikroprozessor einer Steuerschaltung 60 ausgewertet. Aus den Hell-/Dunkelsignalen der Lichtschranken werden die jeweiligen Positionen der Sendungen 1' und 1" ermittelt.These light barrier signals are one of the microprocessor Control circuit 60 evaluated. From the light / dark signals the light barriers are the respective positions of the shipments 1 'and 1 "determined.

FIG 2 zeigt eine vereinfachte Darstellung, bei der eine Anzahl von Sendungen in einem Stapel 100 angeordnet ist.2 shows a simplified representation in which a number of mail items is arranged in a stack 100.

Sobald die Steuerschaltung 60 den Abzugsbefehl erteilt, wird der Abzugsmotor eingeschaltet und die erste Sendung gestartet. Erreicht deren Vorderkante die zweite Lichtschranke 73/73', wird der Abzugsmotor sofort gestoppt, die Sendung wird von den Förderriemen 48 und 49 weiter abgezogen. Der Abzugsmotor wird erst wieder eingeschaltet, wenn die folgende Bedingung erfüllt ist: die erste Lichtschranke 71/71' wird hell.Once the control circuit 60 issues the withdrawal command the trigger motor is switched on and the first program started. Reaches the front edge of the second light barrier 73/73 ', the trigger motor is stopped immediately, the shipment is further subtracted from the conveyor belts 48 and 49. The trigger motor is only switched on again when the following Condition is fulfilled: the first light barrier 71/71 'is bright.

Nun wird der Abzugsmotor wieder gestartet, um die nächste Sendung zu beschleunigen. Sobald deren Vorderkante die erste Lichtschranke 71/71' erreicht, ist deren Position bekannt. Nun kann die Geschwindigkeit v ermittelt werden, mit der die Sendung bis zum Erreichen der zweiten Lichtschranke 73/73' weitertransportiert werden muß, um beim Erreichen dieser genau den Abstand Soll-Lücke zur vorher abgezogenen Sendung zu haben. Es kommt also zu keinem zwischenzeitlichen Stoppen der Sendung.Now the trigger motor is started again to the next one Speed up shipment. As soon as their front edge is the first When light barrier 71/71 'is reached, its position is known. Now the speed v can be determined with which the Consignment until the second light barrier 73/73 'is reached must be transported further to achieve this exactly the distance between the target gap and the previously deducted item to have. So there is no interim stopping of the Broadcast.

Die zur Ermittlung der benötigten Geschwindigkeit v, mit der die nächste Sendung ab Erreichen der ersten Lichtschranke 71/71' bis zum Erreichen der zweiten Lichtschranke 73/73' durch das Abzugsband 25 transportiert werden muß, um die gewünschte Soll-Lücke zu erreichen, notwendigen Beziehungen ergeben sich folgendermaßen:

  • 1. Ohne Berücksichtigung von Beschleunigungszeiten und Reaktionszeiten der Steuerschaltung 60 v1=(lidist*V)/(sollue + lidist - li1gap)
  • 2. Mit Berücksichtigung von Reaktionszeiten T der Steuerschaltung 60 v2=((lidist - T*V)*V)/(sollue +(lidist - T*V) - li1gap)
  • 3. Während der Beschleunigungszeit BZ des Abzugsmotors wird folgender Weg zuviel (bei negativer Beschleunigung) bzw. zuwenig (bei positiver Beschleunigung) zurückgelegt ((Va - v2)*BZ/2)
    • Necessary to determine the required speed v at which the next consignment must be transported through the withdrawal belt 25 from reaching the first light barrier 71/71 'to reaching the second light barrier 73/73' in order to achieve the desired target gap Relationships result as follows:
  • 1. Without taking into account acceleration times and reaction times of the control circuit 60 v1 = (lidist * V) / (sollue + lidist - li1gap)
  • 2. Taking into account the response times T of the control circuit 60 v2 = ((lidist - T * V) * V) / (sollue + (lidist - T * V) - li1gap)
  • 3. During the acceleration time BZ of the trigger motor, the following distance is covered too much (with negative acceleration) or too little (with positive acceleration) ((Va - v2) * BZ / 2)

    • Damit ergibt sich mit Berücksichtigung von Beschleunigungszeiten BZ des Abzugsmotors und Reaktionszeiten T der Steuerschaltung 60: v=(lidist-T*V)*V)/(sollue+((Va-v2)*BZ/2)+(lidist-T*V)-li1gap) mit folgenden Parametern: Parameter Einheit Bedeutung lidist m Abstand der beiden Lichtschranken 71/71' und 73/73' zueinander li1gap m Abstand der Hinterkante der abgezogenen Sendung von der ersten Lichtschranke 71/71', wenn die Vorderkante der abzuziehenden Senung die erste Lichtschranke erreicht sollue m gewünschte Lücke zwischen den abgezogenen Sendungen V m/s Geschwindigkeit der Förderriemen = Geschwindigkeit der abgezogenen Sendung, sobald diese die zweite Lichtschranke 73/73' erreicht hat Va m/s Geschwindigkeit von der die abzuziehende Sendung ab der ersten Lichtschranke beschleunigt wird T s Reaktionszeit der Steuerung auf Kantenerkennung an den Lichtschranken BZ s Beschleunigungs-/Bremszeit des Abzugsmotors Taking acceleration times BZ of the trigger motor and reaction times T of control circuit 60 into account: v = (lidist T * V) * V) / (sollue + ((Va-V2) * BZ / 2) + (lidist T * V) -li1gap) with the following parameters: parameter unit importance lidist m Distance between the two light barriers 71/71 'and 73/73' to each other li1gap m Distance of the rear edge of the withdrawn item from the first light barrier 71/71 ', if the The front edge of the sensor to be removed has reached the first light barrier sollue m desired gap between the deducted items V m / s Conveyor belt speed = speed of the withdrawn mail as soon as it has reached the second light barrier 73/73 ' Va m / s Speed at which the consignment to be withdrawn is accelerated from the first light barrier T s Response time of the control to edge detection on the light barriers BZ s Acceleration / deceleration time of the trigger motor

    Der Abstand Lilgap der Hinterkante der abgezogenen Sendung von der ersten Lichtschranke 71/71' zu dem Zeitpunkt, an dem die Vorderkante der abzuziehenden Sendung die erste Lichtschranke 71/71' erreicht, wird mit Hilfe der Kantensignale der ersten Lichtschranke 71/71' und eines Taktgenerators 80 ermittelt. Erreicht die Vorderkante der abgezogenen Sendung die zweite Lichtschranke 73/73', so wird diese Sendung mit der Geschwindigkeit V weitertransportiert. Erreicht die Hinterkante die erste Lichtschranke 71/71', ist deren Position bekannt und durch Zählung der Takte des Taktgenerators 80 bis zum Zeitpunkt des Vorderkantensignals der nachfolgenden Sendung an der ersten Lichtschranke 71/71' erhält man den Abstand Li1gap.The distance Lilgap the trailing edge of the deducted shipment from the first light barrier 71/71 'at the time when the front edge of the consignment to be subtracted the first light barrier 71/71 'is reached using the edge signals the first light barrier 71/71 'and a clock generator 80 determined. Reaches the front edge of the deducted shipment the second light barrier 73/73 ', so this shipment with the speed V transported on. Reaches the rear edge the first light barrier 71/71 'is its position known and by counting the clocks of the clock generator 80 to at the time of the leading edge signal of the subsequent shipment the distance is obtained at the first light barrier 71/71 ' Li1gap.

    Claims (8)

    1. Method for controlling a device used to remove flat items of mail, which has a controllable removal speed and which feeds the items of mail using conveyor belts (48, 49) which are driven at a constant speed V, characterized in that, between the first sensor (71/71') and simply a second sensor (73/73') which detects the items of mail and which is located at the point of transfer by the conveyor belts (48, 49), that speed of the item of mail (1') to be removed which is necessary so that the predetermined gap is present between the two items of mail (1', 1") at the time at which the front edge of the item of mail to be removed reaches the second sensor (73/73') is determined at the time at which the front edge of the item of mail (1') to be removed has just reached the first sensor (71/71'), from the distance between the rear edge of the preceding, already removed items of mail (1") and a first sensor (71/71') which detects the items of mail and which is located at the position at which the items of mail (1') to be removed have reached a defined average removal speed.
    2. Method according to Claim 1, characterized in that the distance between the rear edge of the already removed item of mail (1") held in the conveyor belts (48, 49) and the first sensor (71/71') is determined at the time at which the front edge of the item of mail (1') to be removed has just reached the first sensor (71/71') from the difference in time between the detection of the rear edge of the removed item of mail (1") and the detection of the front edge of the item of mail (1') to be removed at the first sensor (71/71'), and from the speed V of the conveyor belts (48, 49).
    3. Method according to Claim 1, characterized in that the distance between the rear edge of the already removed item of mail (1") held in the conveyor belts (48, 49) and the first sensor (71/71') is determined from the difference in time between the detection of the rear edge of the removed item of mail (1") and the detection of the front edge of the item of mail (1') to be removed at the first sensor (71/71') using a clock generator (80) which is connected to the driven conveyor rollers (43, 44) of the conveyor belts (48, 49).
    4. Method according to Claim 1, characterized in that the distance between the sensors (71/71', 73/73') at a defined maximum removal speed is so great that a defined maximum change in gap is implemented.
    5. Method according to Claim 1 to 4, characterized in that the removal speed is correspondingly changed starting from the first photoelectric barrier (71/71') in order to compensate the reaction time of the control which reduces the distance available to change the gap.
    6. Method according to Claim 1 to 5, characterized in that, during the change in speed, the removal speed is correspondingly increased or reduced in order to compensate the acceleration time.
    7. Removal device for flat items of mail with conveyor belts (48, 49) which are driven at a constant speed, with a removal device for feeding flat items of mail from a stack (100) to the conveyor belts (48, 49) and having a control circuit (60) for controlling the removal times and removal speeds as a function in each case of the distance between the items of mail (1') to be removed and an item of mail (1") which has already been removed, characterized in that only two sensors (71/71', 73/73') which detect the items of mail are provided, the first sensor (71/71') being located at the position at which the items of mail (1') to be removed have reached a defined average removal speed, and the second sensor (73/73') being located at the point of transfer by the conveyor belts (48, 49), and in that the control circuit (60) is constructed in such a way that, between the two sensors, that speed of the item of mail (1') to be removed which is necessary so that the predetermined gap is present between the two items of mail (1', 1") at the time at which the front edge of the item of mail to be removed reaches the second sensor (73/73') is determined at the time at which the front edge of the item of mail (1') to be removed has just reached the first sensor (71/71'), from the distance between the rear edge of the preceding, already removed item of mail (1") and the first sensor (71/71').
    8. Removal device according to Claim 7, characterized in that a clock generator (80) which is connected to the driven conveyor rollers (43, 44) of the conveyor belts (48, 49) is provided in order to determine the distances covered by the items of mail (1") clamped in the conveyor belts (48, 49).
    EP99930887A 1998-01-15 1999-01-08 Method for controlling a device used to remove packages from a pile Expired - Lifetime EP1045733B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    DE19801309 1998-01-15
    DE19801309A DE19801309C1 (en) 1998-01-15 1998-01-15 Method for controlling a take-off device for flat consignments from a stack
    PCT/DE1999/000025 WO1999036195A1 (en) 1998-01-15 1999-01-08 Method for controlling a device used to remove packages from a pile

    Publications (2)

    Publication Number Publication Date
    EP1045733A1 EP1045733A1 (en) 2000-10-25
    EP1045733B1 true EP1045733B1 (en) 2002-10-30

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP99930887A Expired - Lifetime EP1045733B1 (en) 1998-01-15 1999-01-08 Method for controlling a device used to remove packages from a pile

    Country Status (4)

    Country Link
    EP (1) EP1045733B1 (en)
    JP (1) JP3893243B2 (en)
    DE (2) DE19801309C1 (en)
    WO (1) WO1999036195A1 (en)

    Families Citing this family (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE10355292B4 (en) * 2003-11-27 2005-11-03 Siemens Ag Method and device for separating flat items
    JP4469671B2 (en) 2004-07-09 2010-05-26 株式会社東芝 Paper sheet take-out device
    CN109821770A (en) * 2019-04-10 2019-05-31 河北奈奎斯科技有限公司 A kind of automatic towel defect picks machine

    Family Cites Families (6)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CH650995A5 (en) * 1981-02-10 1985-08-30 Frama Ag FEEDING DEVICE FOR SINGLE FLAT MATERIAL PIECES.
    US4541624A (en) * 1982-03-24 1985-09-17 Nippon Electric Co., Ltd. Flat article feeding apparatus
    DE3424397A1 (en) * 1984-07-03 1986-01-09 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt SINGLE DEVICE FOR FLAT OBJECTS
    DE3544093A1 (en) * 1985-12-13 1987-06-19 Licentia Gmbh METHOD FOR CONTROLLING THE DEDUCTION PROCESS IN A SEPARATING DEVICE AND ARRANGEMENT FOR IMPLEMENTING THE METHOD
    GB9113784D0 (en) 1991-06-26 1991-11-06 Vickers Plc Ship stabiliser automatic gain control system
    DE19607304C1 (en) * 1996-02-27 1997-07-31 Aeg Electrocom Gmbh Method for controlling a take-off device for flat consignments from a stack

    Also Published As

    Publication number Publication date
    EP1045733A1 (en) 2000-10-25
    DE59903244D1 (en) 2002-12-05
    JP3893243B2 (en) 2007-03-14
    JP2002509063A (en) 2002-03-26
    DE19801309C1 (en) 1999-08-12
    WO1999036195A1 (en) 1999-07-22

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