EP0890536A1 - Device for preventing double feeds - Google Patents

Device for preventing double feeds Download PDF

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Publication number
EP0890536A1
EP0890536A1 EP98112798A EP98112798A EP0890536A1 EP 0890536 A1 EP0890536 A1 EP 0890536A1 EP 98112798 A EP98112798 A EP 98112798A EP 98112798 A EP98112798 A EP 98112798A EP 0890536 A1 EP0890536 A1 EP 0890536A1
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EP
European Patent Office
Prior art keywords
scraper
friction
take
belt
coefficient
Prior art date
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Granted
Application number
EP98112798A
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German (de)
French (fr)
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EP0890536B1 (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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Publication date
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Publication of EP0890536A1 publication Critical patent/EP0890536A1/en
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Publication of EP0890536B1 publication Critical patent/EP0890536B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/46—Supplementary devices or measures to assist separation or prevent double feed
    • B65H3/52—Friction retainers acting on under or rear side of article being separated

Definitions

  • the present invention relates to a device according to the Preamble of claim 1.
  • skid-shaped wipers used which are movably mounted and by spring force against the shipments.
  • the surface of the wipers, that touches the shipments consists of a friction lining.
  • the Actuating force generated via the friction coefficient of the friction lining a retention force on the double-deducted items that is greater than the force between the consignments, so that only the Shipments are deducted on the moving conveyor belt with the greatest coefficient of friction.
  • the executed Movable storage of the scraper only allows pulling of shipments in a restricted range different Consignment thicknesses.
  • Another disadvantage is that thin shipments and low deflection of the scraper Retention force is smaller than with thicker mail items with larger ones Deflection of the scraper, causing the thicker shipments be stressed more.
  • the invention specified in claim 1 is therefore the problem based on creating a scraper device with the double deductions of consignments with a larger thickness range than can be prevented according to the prior art, and in the the stress on the consignments regardless of the consignment thickness is.
  • the curved stiffener contour designed as an involute to the axis of rotation, so that the effective lever arm is always the same at the point of contact.
  • the consignment stack lying against a boundary 1, consisting of Consignments of different thicknesses become separating devices from the right pushed with a trigger tape 2. Touched the frontmost consignment 3 the withdrawal tape 2, so the consignment 3 because of the high coefficient of friction of the trigger belt 2 by the Gap between trigger belt and limit 1 is deducted.
  • Behind the There is a wiper 4 in the gap in the pull-off direction is rotatably mounted in a locally fixed axis of rotation 5.
  • the one in the deflection area part 9 of the contour facing the trigger belt 2 is as Involute trained to the axis of rotation.
  • the scraper 4 is according to the thickness of the to be pulled Shipments 3 deflected and slides across the surface of the foremost mail item 3 to be deducted from the stack.
  • the stops Scraper 4 the following shipments 3 back because of the frictional force between the stripper 4 and the consignment to be retained larger than between the shipments, but smaller than the friction force between deduction band 2 and shipment.
  • the scraper contour acts Scraper 4 deflecting force regardless of the thickness of the Consignment and thus from the point of application of force to the contour always with the same effective lever arm on the axis of rotation 5 of the wiper 4.
  • the main tension spring 6 and the compensation tension spring 7 are dimensioned and attached so that the resetting Force independent of the deflection of the scraper 4 remains constant. This is also the resetting torque constant. So there is a horizontal characteristic of the Scraper 4 when deflecting in the work area.
  • a horizontal characteristic of the scraper 4 can also be achieved if the effective effective lever arm depends on Is the deflection angle, and this dependence when dimensioning and attachment of the spring elements for the resetting Force is taken into account so that at the point of contact acting torque approximately regardless of the deflection is constant.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)

Abstract

The device blocks delivery of more than one item using a stripping element (4). This element is pressed against the delivery conveyor which feeds off the individual mail items from a stack containing items of varying thickness. The stripper is pivoted. It has a curved surface contacting the delivery conveyor, for deflection by the delivered item until the resetting force provided by a resetting mechanism (6) is reached.

Description

Die vorliegende Erfindung betrifft eine Vorrichtung nach dem Oberbegriff des Anspruches 1.The present invention relates to a device according to the Preamble of claim 1.

Zur Vermeidung von Doppel- bzw. Mehrfachabzügen bei der Vereinzelung von flachen Sendungen, insbesondere Briefsendungen werden, wie in DE-PS 27 04 045 beschrieben, kufenförmige Abstreifer eingesetzt, die beweglich gelagert sind und durch Federkraft gegen die Sendungen gedrückt werden. Die Oberfläche der Abstreifer, die die Sendungen berührt, besteht aus einem Reibbelag. Die Stellkraft erzeugt über den Reibkoeffizienten des Reibbelages auf die doppelt abgezogenen Sendungen eine Rückhaltekraft, die größer ist als die Kraft zwischen den Sendungen, so daß nur die Sendungen abgezogen werden, die am sich bewegenden Abzugsband mit dem größten Reibkoeffizienten anliegen. Die ausgeführte bewegliche Lagerung des Abstreifers gestattet nur das Abziehen von Sendungen in einem eingeschränkten Bereich unterschiedlicher Sendungsdicken. Ein weiterer Nachteil besteht darin, daß bei dünnen Sendungen und geringer Auslenkung des Abstreifers die Rückhaltekraft kleiner ist als bei dickeren Sendungen mit größerer Auslenkung des Abstreifers, wodurch die dickeren Sendungen stärker beansprucht werden.To avoid double or multiple deductions when separating of flat items, especially letters, as described in DE-PS 27 04 045, skid-shaped wipers used, which are movably mounted and by spring force against the shipments. The surface of the wipers, that touches the shipments consists of a friction lining. The Actuating force generated via the friction coefficient of the friction lining a retention force on the double-deducted items that is greater than the force between the consignments, so that only the Shipments are deducted on the moving conveyor belt with the greatest coefficient of friction. The executed Movable storage of the scraper only allows pulling of shipments in a restricted range different Consignment thicknesses. Another disadvantage is that thin shipments and low deflection of the scraper Retention force is smaller than with thicker mail items with larger ones Deflection of the scraper, causing the thicker shipments be stressed more.

Der im Anspruch 1 angegebenen Erfindung liegt daher das Problem zugrunde, eine Abstreifervorrichtung zu schaffen, mit der Doppelabzüge von Sendungen mit einem größeren Dickenspektrum als nach dem Stand der Technik verhindert werden können, und bei der die Beanspruchung der Sendungen unabhängig von der Sendungsdicke ist.The invention specified in claim 1 is therefore the problem based on creating a scraper device with the double deductions of consignments with a larger thickness range than can be prevented according to the prior art, and in the the stress on the consignments regardless of the consignment thickness is.

Infolge der erfindungsgemäßen Lösung ist das am Berührungspunkt mit der Sendung wirkende rückhaltende Drehmoment durch die besondere Kontur des Abstreifers und die Dimensionierung und Befestigung der Rückstellelemente unabhängig vom Auslenkungswinkel und damit von der Sendungsdicke bei relativ großem Dickenspektrum.As a result of the solution according to the invention, this is at the point of contact restrained torque acting with the broadcast through the special contour of the scraper and the dimensioning and Fixing the reset elements regardless of the deflection angle and therefore of the consignment thickness with a relatively large range of thicknesses.

In den Unteransprüchen sind vorteilhafte Ausgestaltungen der Erfindung angegeben. Gemäß Anspruch 2 ist die gekrümmte Absteiferkontur als Evolvente zur Drehachse ausgeführt, so daß der effektiv wirkende Hebelarm am Berührungspunkt stets gleich ist.Advantageous refinements of the Invention specified. According to claim 2, the curved stiffener contour designed as an involute to the axis of rotation, so that the effective lever arm is always the same at the point of contact.

Zur günstigen Realisierung der Rückstellmittel greifen zwei Zugfedern mit linearer Kennlinie so an dem Abstreifer an, daß die Rückstellkraft unabhängig von der Auslenkung annähernd konstant ist.Two are effective for realizing the reset means Tension springs with a linear characteristic curve on the wiper so that the restoring force almost independent of the deflection is constant.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher erläutert. Dabei zeigen.

FIG 1a
eine Draufsicht auf die erfindungsgemäße Vorrichtung im unausgelenkten Zustand,
FIG 1b
eine Draufsicht auf die erfindungsgemäße Vorrichtung im ausgelenkten Zustand,
FIG 2
eine Draufsicht auf die erfindungsgemäße Vorrichtung im ausgelenkten Zustand mit Längen- und Winkelangaben.
An embodiment of the invention is shown in the drawing and is explained in more detail below. Show.
FIG 1a
a plan view of the device according to the invention in the undeflected state
1b
a plan view of the device according to the invention in the deflected state,
FIG 2
a plan view of the device according to the invention in the deflected state with length and angle information.

Der an einer Begrenzung 1 anliegende Sendungsstapel, bestehend aus Sendungen unterschiedlicher Dicke wird von rechts zur Vereinzelungseinrichtung mit einem Abzugsband 2 geschoben. Berührt die vorderste Sendung 3 das Abzugsband 2, so wird die Sendung 3 wegen des hohen Reibkoeffizienten des Abzugsbandes 2 durch den Spalt zwischen Abzugsband und Begrenzung 1 abgezogen. Hinter dem Spalt in Abzugsrichtung befindet sich ein Abstreifer 4. Dieser ist in einer örtlich festen Drehachse 5 drehbar gelagert. An dem Abstreifer 4 sind zwei Zugfedern 6 und 7 mit ihren freien Enden befestigt, die den Abstreifer 4 in der dargestellten und durch einen Anschlag 8 festgelegten Ruhestellung halten.The consignment stack lying against a boundary 1, consisting of Consignments of different thicknesses become separating devices from the right pushed with a trigger tape 2. Touched the frontmost consignment 3 the withdrawal tape 2, so the consignment 3 because of the high coefficient of friction of the trigger belt 2 by the Gap between trigger belt and limit 1 is deducted. Behind the There is a wiper 4 in the gap in the pull-off direction is rotatably mounted in a locally fixed axis of rotation 5. To the Wipers 4 are two tension springs 6 and 7 with their free ends attached to the scraper 4 in the illustrated and by hold a stop 8 fixed rest position.

Bedingt durch die Form des Abstreifers 4 und den Anschlag 8 kann der Abstreifer um max. 90° ausgelenkt werden. Der im Auslenkbereich zum Abzugsband 2 gerichtete Teil 9 der Kontur ist als Evolvente zur Drehachse ausgebildet.Due to the shape of the scraper 4 and the stop 8 can the scraper by max. Can be deflected 90 °. The one in the deflection area part 9 of the contour facing the trigger belt 2 is as Involute trained to the axis of rotation.

Der Abstreifer 4 wird entsprechend der Dicke der durchzuziehenden Sendungen 3 ausgelenkt und gleitet über die Oberfläche der vordersten abzuziehenden Sendung 3 des Stapels. Dabei hält der Abstreifer 4 die folgenden Sendungen 3 zurück, da die Reibkraft zwischen dem Abstreifer 4 und der zurückzuhaltenden Sendung größer als zwischen den Sendungen, aber kleiner als die Reibkraft zwischen Abzugsband 2 und Sendung ist.The scraper 4 is according to the thickness of the to be pulled Shipments 3 deflected and slides across the surface of the foremost mail item 3 to be deducted from the stack. The stops Scraper 4 the following shipments 3 back because of the frictional force between the stripper 4 and the consignment to be retained larger than between the shipments, but smaller than the friction force between deduction band 2 and shipment.

Infolge der Evolventenform der Abstreiferkontur wirkt die den Abstreifer 4 auslenkende Kraft unabhängig von der Dicke der Sendung und damit vom Angriffspunkt der Kraft auf die Kontur stets mit dem gleichen effektiven Hebelarm auf die Drehachse 5 des Abstreifers 4. Die Hauptzugfeder 6 und die Ausgleichszugfeder 7 sind derart dimensioniert und angebracht, daß die rückstellende Kraft unabhängig von der Auslenkung des Abstreifers 4 konstant bleibt. Damit ist auch das rückstellende Drehmoment konstant. Es ergibt sich also eine waagerechte Kennlinie des Abstreifers 4 beim Auslenken im Arbeitsbereich.As a result of the involute shape of the scraper contour, it acts Scraper 4 deflecting force regardless of the thickness of the Consignment and thus from the point of application of force to the contour always with the same effective lever arm on the axis of rotation 5 of the wiper 4. The main tension spring 6 and the compensation tension spring 7 are dimensioned and attached so that the resetting Force independent of the deflection of the scraper 4 remains constant. This is also the resetting torque constant. So there is a horizontal characteristic of the Scraper 4 when deflecting in the work area.

Die mathematische Beschreibung zur Dimensionierung der Zugfedern, damit die rückstellende Kraft unabhängig vom Auslenkwinkel ist, lautet folgendermaßen:

i
Index
1: Index für Zugfeder 1
2: Indes für Ausgleichsfeder 2
µ
Winkel [°]
a
Abstand [mm]
r
Radius [mm]
s(µ)
effektiver Hebelarm [mm]
Lo
ungespannte Federlänge [mm]
L(µ)
gespannte Federlänge [mm]
F
Federkraft [N]
Rm
Federrate [N/mm]
D
Drehmoment [Nmm]
li(µi) = [ (r+a)2 + r2 - 2r (r + a) cos(µi) ]1/2 si(µi) = [ (( r + a) r) L(µi) ] sin (µi) Fi(I(µi)=[ ((µi) - Loi ] Rmi Di = F(L(µi)) s(µi) Dres = D1(µl) - D2(µ2)   [soll konstant sein] The mathematical description of the dimensioning of the tension springs so that the restoring force is independent of the deflection angle is as follows:
i
index
1: Index for tension spring 1
2: Meanwhile for balancing spring 2
µ
Angle [°]
a
Distance [mm]
r
Radius [mm]
s (µ)
effective lever arm [mm]
L o
unstressed spring length [mm]
L (µ)
tensioned spring length [mm]
F
Spring force [N]
Rm
Spring rate [N / mm]
D
Torque [Nmm]
li (µi) = [(r + a) 2nd + r 2nd - 2r (r + a) cos (µi)] 1/2 si (µi) = [((r + a) r) L (µi)] sin (µi) Fi (I (µi) = [((µi) - L oi ] Rmi Di = F (L (µi)) s (µi) Dres = D1 (µl) - D2 (µ2) [should be constant]

Eine waagerechte Kennlinie des Abstreifers 4 ist auch zu erreichen, wenn der effektive wirksame Hebelarm abhängig vom Auslenkwinkel ist, und diese Abhängigkeit bei der Dimensionierung und Anbringung der Federelemente für die rückstellende Kraft so berücksichtigt wird, daß das am Berührungspunkt wirkende Drehmoment unabhängig von der Auslenkung annähernd konstant ist.A horizontal characteristic of the scraper 4 can also be achieved if the effective effective lever arm depends on Is the deflection angle, and this dependence when dimensioning and attachment of the spring elements for the resetting Force is taken into account so that at the point of contact acting torque approximately regardless of the deflection is constant.

Claims (3)

Vorrichtung zum Verhindern von Doppelabzügen bei einer Vereinzelungsvorrichtung für flache Sendungen (3) unterschiedlicher Dicke, bei der auf der einen Seite des Förderweges mindestens ein in Förderrichtung umlaufendes, die flachen Sendungen durch Reibung mitführendes Abzugsband (2) und auf der anderen Seite zum Zurückhalten von zuviel abgezogenen Sendungen mindestens ein Abstreifer (4) angeordnet ist, an welchem zu viel abgezogene Sendungen (3) zurückgehalten werden, wobei der Reibungskoeffizient zwischen Abzugsband (2) und Sendung (3) größer ist als der Reibungskoeffizient zwischen Abstreifer (4) und Sendung (3) und der Reibungskoeffizient zwischen Abstreifer (4) und Sendung (3) größer ist als der Reibungskoeffizient zwischen zwei Sendungen,
dadurch gekennzeichnet, daß der Abstreifer (4) drehbar gelagert ist und im Schwenkbereich zum Abzugsband (2) hin eine stetig in gleiche Richtung gekrümmte Konten aufweist, wobei sich der Abstand des Abstreifers (4) zum Abzugsband (2) mit wachsender Auslenkung stetig erhöht, der Abstreifer (4) durch die Mitnahmekräfte der bewegten Sendungen (3) in Abzugsrichtung solange ausgelenkt wird, bis sich die von Rückstellmitteln erzeugten Rückstellkräfte und die Mitnahmekräfte im Gleichgewicht befinden und wobei die Rückstellmittel so ausgeführt sind, daß auf die zurückgehaltenen Sendungen (3) unabhängig vom Auslenkwinkel stets eine annähernd gleiche Rückhaltekraft ausgeübt wird. Device for preventing double take-offs in a separating device for flat mail items (3) of different thicknesses, in which on one side of the conveying path at least one take-off belt (2) rotating in the conveying direction and carrying the flat mail items by friction and on the other side for holding back too much withdrawn mail items at least one stripper (4) is arranged, on which too much withdrawn mail items (3) are retained, the coefficient of friction between the take-off belt (2) and the mail item (3) being greater than the coefficient of friction between the strippers (4) and the mail item (3 ) and the coefficient of friction between the scraper (4) and the consignment (3) is greater than the coefficient of friction between two consignments,
characterized in that the scraper (4) is rotatably mounted and in the swiveling range towards the take-off belt (2) has accounts that are continuously curved in the same direction, the distance between the stripper (4) and the take-off belt (2) increasing with increasing deflection, the scraper (4) is deflected by the entraining forces of the moving mail items (3) in the pull-off direction until the restoring forces generated by the restoring means and the entraining forces are in equilibrium, and the restoring means are designed so that the held back items (3) are independent approximately the same retention force is always exerted by the deflection angle. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet daß, die gekrümmte Kontur des Abstreifers (4) in Transportrichtung zur Drehachse (5) eine Evolvente (9) bildet, so daß die den Abstreifer (4) auslenkenden Mitnahmekräfte im Angriffspunkt stets den gleichen effektiven Hebelarm auf die Drehachse (5) haben. Apparatus according to claim 1, characterized in that the curved contour of the scraper (4) in the transport direction to the axis of rotation (5) forms an involute (9) so that the driving forces deflecting the scraper (4) always have the same effective lever arm on the point of application Have axis of rotation (5). Vorrichtung nach Anspruch 1, dadurch gekennzeichnet daß, die Rückstellmittel aus zwei an einem Ende räumlich festen Zugfedern (6, 7) mit linearer Kennlinie bestehen, die so dimensioniert und mit den anderen Enden am Abstreifer (4) befestigt sind, daß unabhängig von der Auslenkung die im jeweiligen Angriffspunkt wirkende Rückstellkraft konstant ist.Device according to claim 1, characterized in that the restoring means consist of two tension springs (6, 7) spatially fixed at one end with a linear characteristic, which are dimensioned and attached to the stripper (4) with the other ends such that they are independent of the deflection the restoring force acting in the respective point of application is constant.
EP98112798A 1997-07-09 1998-07-09 Device for preventing double feeds Expired - Lifetime EP0890536B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19729430 1997-07-09
DE19729430A DE19729430A1 (en) 1997-07-09 1997-07-09 Device for preventing double prints

Publications (2)

Publication Number Publication Date
EP0890536A1 true EP0890536A1 (en) 1999-01-13
EP0890536B1 EP0890536B1 (en) 2002-05-08

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ID=7835189

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98112798A Expired - Lifetime EP0890536B1 (en) 1997-07-09 1998-07-09 Device for preventing double feeds

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EP (1) EP0890536B1 (en)
DE (2) DE19729430A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19908421C1 (en) * 1999-02-26 2000-05-25 Siemens Ag Separating flat consignments from stack
DE10131749B4 (en) * 2001-07-03 2013-04-18 Deutsche Post Ag Device for separating flat mail pieces
DE10342568A1 (en) * 2003-09-15 2005-04-14 Giesecke & Devrient Gmbh Device and method for separating sheet material

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2704045A1 (en) * 1977-02-01 1978-08-03 Licentia Gmbh CONVEYING DEVICE WITH A SCRAPER FOR HOLDING BACK MULTIPLE SHIPPING
DE3444335A1 (en) * 1984-12-05 1986-06-05 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt SEALING DEVICE

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2704045A1 (en) * 1977-02-01 1978-08-03 Licentia Gmbh CONVEYING DEVICE WITH A SCRAPER FOR HOLDING BACK MULTIPLE SHIPPING
DE3444335A1 (en) * 1984-12-05 1986-06-05 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt SEALING DEVICE

Also Published As

Publication number Publication date
EP0890536B1 (en) 2002-05-08
DE19729430A1 (en) 1999-01-14
DE59804025D1 (en) 2002-06-13

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