WO2007031176A1 - Device for determining the mass of an object, in particular an item of mail - Google Patents

Device for determining the mass of an object, in particular an item of mail Download PDF

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Publication number
WO2007031176A1
WO2007031176A1 PCT/EP2006/008235 EP2006008235W WO2007031176A1 WO 2007031176 A1 WO2007031176 A1 WO 2007031176A1 EP 2006008235 W EP2006008235 W EP 2006008235W WO 2007031176 A1 WO2007031176 A1 WO 2007031176A1
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Prior art keywords
mass
electric motor
change
determined
transport elements
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PCT/EP2006/008235
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German (de)
French (fr)
Inventor
Andriy Dronnik
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Siemens Aktiengesellschaft
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Publication of WO2007031176A1 publication Critical patent/WO2007031176A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/002—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for postal parcels and letters
    • G01G19/005—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for postal parcels and letters with electric or electronic computing means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/02—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles
    • G01G19/03—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles for weighing during motion

Definitions

  • the invention relates to a device for determining the mass of an article, in particular a mailpiece, according to the preambles of claims 1, 3 and 5.
  • Scales for determining the mass of mailpieces are known as postal scales. They have a bearing surface for the mail item, which experiences an elastic displacement relative to a spring element, which in turn is converted into a weight display.
  • Post-sorting machines which transport mailpieces, in particular letters, by means of two endlessly circulating belts, the mail item being located between the belts and held by them.
  • One of the belts is usually driven by an electric motor.
  • a disadvantage of the known post-sorting machines that they can not determine the masses of the transported mail, in particular by e.g. to be able to check a sufficient franking of the mail item.
  • the object of the invention is to provide a device for determining the mass of an object, which is transported by means of an electric motor, the device being used in particular for a post-sorting machine and with which the mass of a mailpiece without constructive changes should be determinable with little effort ,
  • the object of the invention is solved by the features of claims 1, 3 and 5; the dependent claims indicate advantageous embodiments.
  • a first solution provides that the mass is determined on the basis of the change in the electrical energy consumption of the electric motor during the passage.
  • a second solution provides that the object is positively and / or negatively accelerated during transport and the mass is determined by the vibrations that occur in the course of time of the speed of the object after completion of the acceleration.
  • a third solution provides that the mass is determined at constant engine torque based on the engine speed change during the passage of the object, wherein the engine speed change corresponds to the speed change of the object and the mass is proportional to the change in the engine speed and thus to change the speed.
  • Constructively simple transport elements are endlessly circulating conveyor belts or rollers.
  • the electric motor is computer or controller controlled.
  • the invention will be described below with reference to a drawing.
  • FIG. 2 shows a device according to FIG. 1 with endless circulating conveyor belts instead of the rollers
  • FIG. 3 shows a power-mass diagram of the electric motor
  • FIG. 4 shows a speed-time diagram with additionally indicated torque curve
  • FIG. 5 shows a speed-time diagram after the acceleration of a correspondence has been carried out.
  • FIG. 1 shows a schematic representation of a device for determining the mass of letters 1, wherein the letter 1 moves in the direction of arrow 2.
  • the letter 1 is detected by two counter-rotating rollers 3 as rotating transport elements 4, between which it is during transport and of which it is held due to the effective frictional forces.
  • the arrows 5 indicate the direction of rotation of the rollers 3.
  • the two prestressed rollers 3 are pressed apart.
  • One of the two rollers 3 is driven by an electric motor 6, which may be a servo motor, of course, both rollers 3 may be driven.
  • a device 7 Connected to the electric motor 6 is a device 7 with which electrical and dynamic operating variables of the electric motor 6 are detected, in particular during the passage of a letter 1.
  • the (electrical) variables measured by the device 7 are evaluated by means of a controller 8 or computer ,
  • the electrical and dynamic quantities are measured in each case during the passage of the letter 1 in order to determine its mass.
  • the electrical quantities include the change in the electric power P, and the dynamic ones include the speed V and the amplitude difference A of the first oscillation leaking vibration 13 after an acceleration of the letter 1.
  • the device according to FIG. 1 may belong, for example, to a post-sorting machine.
  • FIG 2 shows a similar device as in FIG 1, wherein instead of the rollers 3 endless circulating conveyor belts 9 are used. Strictly speaking, the rollers 3 are still present, but these act together with other rollers 10, the roller pairs 3, 10 are connected to each other via the conveyor belts 9.
  • the conveyor belts 9 are preferably used in letters 1 or other (relatively flat) mail items.
  • FIG. 3 shows a power-to-mass diagram of the electric motor 6, the power consumption P being shown in watts W over the mass m in grams g. It can be seen that the relationship between power P and mass m is linear.
  • the electric motor 6 consumes energy proportional to the transported mass of the continuous letter 1.
  • the change in the power P per unit time is equal to the change in electrical energy consumption.
  • FIG. 4 shows a speed-time diagram in which the speed V is plotted against the time t.
  • FIG. 4 shows a speed curve 11 and, in addition, the time profile 12 of the engine torque M.
  • the curve 12 of the engine torque M has an area in which the engine torque M is constant.
  • a speed difference V2 - V1 is determined during the passage of a letter 1 at two times t1 and t2.
  • the engine speed of the electric motor 6 changes in heavy letters 1 stronger than light letters 1.
  • the engine speed change corresponds to the speed change, both of which are proportional to the mass of the letter 1 during a letter pass.
  • FIG. 5 shows a speed-time diagram for the case in which the letter is accelerated and / or braked in the time interval t 1 -t 2 by means of the transport elements 4 in such a way that its speed increases linearly.
  • the controller 8 After passage of the letter 1 or after acceleration has occurred with respect to the speed of the transport elements 4 to overshoot with an expiring vibration 13, by means of the controller 8, the amplitude difference A of the first oscillation is detected.
  • the relationship between the amplitude difference A and the mass of the transported letter is produced, which is proportional to a first approximation.
  • the oscillation period T and damping of the decaying oscillations 13 can also be taken into account. Also for this purpose then appropriate calibrations are required before the actual measurements.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Sorting Of Articles (AREA)

Abstract

The invention relates to a device for determining the mass of an object (1), in particular an item of mail, having an electric motor (6), in particular a mail sorting machine, for transporting the object (1), wherein at least one of the transport elements (4) used for this purpose is driven by the electric motor (6), and having a device (7) for measuring electrical and dynamic variables (P, V, A) of the electric motor (6), wherein the mass (m) is determined by reference to the measured variables (P, V, A). In order to determine the mass (m) it is proposed that it be determined by reference to the change in the electrical power consumption (P) of the electric motor (6) during the run, or that the object (1) be accelerated positively and/or negatively during the transportation and the mass (m) being determined by reference to the oscillations which occur in the time profile of the velocity (V) of the object (1) whenever the acceleration has ended, or that the mass (m) is determined by reference to the change in the engine speed during the run given a constant engine torque (M), the change in the engine speed corresponding to the change in the speed of the object (1), and the mass (M) being proportional to the change in the engine speed and thus to the change in the velocity (V).

Description

Beschreibungdescription
Vorrichtung zur Bestimmung der Masse eines Gegenstandes, insbesondere einer PostsendungDevice for determining the mass of an article, in particular a mailpiece
Die Erfindung betrifft eine Vorrichtung zur Bestimmung der Masse eines Gegenstandes, insbesondere einer Postsendung, gemäß den Oberbegriffen der Ansprüche 1, 3 und 5.The invention relates to a device for determining the mass of an article, in particular a mailpiece, according to the preambles of claims 1, 3 and 5.
Waagen zur Bestimmung der Masse von Postsendungen sind als Briefwaagen bekannt. Sie weisen eine Auflagefläche für die Postsendung auf, welche dabei eine elastische Verschiebung gegenüber einem Federelement erfährt, die wiederum in eine Gewichtsanzeige umgesetzt wird.Scales for determining the mass of mailpieces are known as postal scales. They have a bearing surface for the mail item, which experiences an elastic displacement relative to a spring element, which in turn is converted into a weight display.
Weiter sind Post-Sortiermaschinen bekannt, welche Postsendungen, insbesondere Briefe, mittels zweier endlos umlaufender Bänder transportieren, wobei sich die Postsendung zwischen den Bändern befindet und von diesen gehalten wird. Dabei ist eines der Bänder üblicherweise von einem Elektromotor angetrieben.Post-sorting machines are also known which transport mailpieces, in particular letters, by means of two endlessly circulating belts, the mail item being located between the belts and held by them. One of the belts is usually driven by an electric motor.
Nachteilig ist bei den bekannten Post-Sortiermaschinen, dass diese die Massen der transportierten Postsendungen nicht bestimmen können, insbesondere um z.B. eine ausreichende Frankierung der Postsendung prüfen zu können.A disadvantage of the known post-sorting machines that they can not determine the masses of the transported mail, in particular by e.g. to be able to check a sufficient franking of the mail item.
Die Aufgabe der Erfindung ist es, eine Vorrichtung zur Bestimmung der Masse eines Gegenstandes anzugeben, der mittels eines Elektromotors transportiert wird, wobei die Vorrichtung insbesondere für eine Post-Sortiermaschine verwendbar und mit der die Masse einer Postsendung ohne konstruktive Änderungen mit geringem Aufwand bestimmbar sein soll. Die Aufgabe der Erfindung wird durch die Merkmale der Ansprüche 1, 3 und 5 gelöst; die Unteransprüche geben vorteilhafte Ausgestaltungen an.The object of the invention is to provide a device for determining the mass of an object, which is transported by means of an electric motor, the device being used in particular for a post-sorting machine and with which the mass of a mailpiece without constructive changes should be determinable with little effort , The object of the invention is solved by the features of claims 1, 3 and 5; the dependent claims indicate advantageous embodiments.
Eine erste Lösung sieht vor, dass die Masse anhand der Änderung des elektrischen Energieverbrauchs des Elektromotors während des Durchlaufs bestimmt wird.A first solution provides that the mass is determined on the basis of the change in the electrical energy consumption of the electric motor during the passage.
Technisch einfach ist es, wenn der Energieverbrauch bei kon- stanter Motordrehzahl bestimmt wird.It is technically simple if the energy consumption is determined at a constant engine speed.
Eine zweite Lösung sieht vor, dass der Gegenstand während des Transports positiv und/oder negativ beschleunigt wird und die Masse anhand der Schwingungen bestimmt wird, die im zeitli- chen Verlauf der Geschwindigkeit des Gegenstandes jeweils nach Beendigung der Beschleunigung auftreten.A second solution provides that the object is positively and / or negatively accelerated during transport and the mass is determined by the vibrations that occur in the course of time of the speed of the object after completion of the acceleration.
Eine ausreichende Genauigkeit wird mit geringem Aufwand erzielt, wenn die Masse anhand der Amplitudendifferenz der ge- dämpft abklingenden Schwingung bestimmt wird.A sufficient accuracy is achieved with little effort, if the mass is determined by the amplitude difference of the attenuated decaying vibration.
Eine dritte Lösung sieht vor, dass die Masse bei konstantem Motordrehmoment anhand der Motordrehzahländerung während des Durchlaufs des Gegenstandes bestimmt wird, wobei die Motor- drehzahländerung der Geschwindigkeitsänderung des Gegenstandes entspricht und die Masse proportional zur Änderung der Motordrehzahl und damit zur Änderung der Geschwindigkeit ist.A third solution provides that the mass is determined at constant engine torque based on the engine speed change during the passage of the object, wherein the engine speed change corresponds to the speed change of the object and the mass is proportional to the change in the engine speed and thus to change the speed.
Bei konstruktiv einfach ausgeführten Transportelementen han- delt es sich um endlos umlaufende Transportbänder oder Rollen.Constructively simple transport elements are endlessly circulating conveyor belts or rollers.
Zur einfacheren Erfassung der Masse wird vorgeschlagen, dass der Elektromotor Computer- oder controllergesteuert ist. Die Erfindung wird nachfolgend anhand einer Zeichnung näher beschrieben.For easier detection of the mass is proposed that the electric motor is computer or controller controlled. The invention will be described below with reference to a drawing.
Es zeigen FIG 1 eine Vorrichtung zur Bestimmung der Masse von1 shows a device for determining the mass of
Briefen mit umlaufenden Rollen als Transportelemente,Letters with revolving rollers as transport elements,
FIG 2 eine Vorrichtung gemäß FIG 1 mit endlos umlaufenden Transportbändern anstelle der Rollen, FIG 3 ein Leistungs-Masse-Diagramm des Elektromotors,2 shows a device according to FIG. 1 with endless circulating conveyor belts instead of the rollers, FIG. 3 shows a power-mass diagram of the electric motor,
FIG 4 ein Geschwindigkeits-Zeit-Diagramm mit zusätzlich eingezeichnetem Drehmomentverlauf und FIG 5 ein Geschwindigkeits-Zeit-Diagramm nach er- folgter Beschleunigung einer Briefsendung.4 shows a speed-time diagram with additionally indicated torque curve, and FIG. 5 shows a speed-time diagram after the acceleration of a correspondence has been carried out.
FIG 1 zeigt eine schematische Darstellung einer Vorrichtung zur Bestimmung der Masse von Briefen 1, wobei sich der Brief 1 in Pfeilrichtung 2 bewegt. Der Brief 1 wird von zwei gegenläufig rotierenden Rollen 3 als umlaufende Transportelemente 4 erfasst, zwischen denen er sich während des Transports befindet und von denen er aufgrund der wirksamen Reibungskräfte gehalten wird. Zum besseren Verständnis zeigen die Pfeile 5 die Drehrichtung der Rollen 3 an. Je nach Dicke des Briefes 1 werden die beiden vorgespannten Rollen 3 auseinandergedrückt. Eine der beiden Rollen 3 wird von einem Elektromotor 6 angetrieben, bei dem es sich um einen Servo- Motor handeln kann, selbstverständlich können auch beide Rollen 3 angetrieben sein. An den Elektromotor 6 ist eine Ein- richtung 7 angeschlossen, mit der elektrische und dynamische Betriebsgrößen des Elektromotors 6 erfasst werden, insbesondere während des Durchlaufs eines Briefes 1. Die von der Einrichtung 7 gemessenen (elektrischen) Größen werden mittels eines Controllers 8 oder Computers ausgewertet. Gemessen werden die elektrischen und dynamischen Größen jeweils beim Durchlauf des Briefes 1, um daraus dessen Masse zu bestimmen. Zu den elektrischen Größen gehört die Änderung des elektrischen Leistung P und zu den dynamischen gehören die Geschwindigkeit V und die Amplitudendifferenz A der ersten Schwingung auslaufenden Schwingung 13 nach einer Beschleunigung des Briefes 1.1 shows a schematic representation of a device for determining the mass of letters 1, wherein the letter 1 moves in the direction of arrow 2. The letter 1 is detected by two counter-rotating rollers 3 as rotating transport elements 4, between which it is during transport and of which it is held due to the effective frictional forces. For a better understanding, the arrows 5 indicate the direction of rotation of the rollers 3. Depending on the thickness of the letter 1, the two prestressed rollers 3 are pressed apart. One of the two rollers 3 is driven by an electric motor 6, which may be a servo motor, of course, both rollers 3 may be driven. Connected to the electric motor 6 is a device 7 with which electrical and dynamic operating variables of the electric motor 6 are detected, in particular during the passage of a letter 1. The (electrical) variables measured by the device 7 are evaluated by means of a controller 8 or computer , The electrical and dynamic quantities are measured in each case during the passage of the letter 1 in order to determine its mass. The electrical quantities include the change in the electric power P, and the dynamic ones include the speed V and the amplitude difference A of the first oscillation leaking vibration 13 after an acceleration of the letter 1.
Die Vorrichtung gemäß FIG 1 kann beispielsweise zu einer Post-Sortiermaschine gehören.The device according to FIG. 1 may belong, for example, to a post-sorting machine.
FIG 2 zeigt eine ähnliche Vorrichtung wie FIG 1, wobei anstelle der Rollen 3 endlos umlaufende Transportbänder 9 verwendet werden. Genau genommen sind die Rollen 3 immer noch vorhanden, allerdings wirken diese mit weiteren Rollen 10 zusammen, wobei die Rollenpaare 3, 10 über die Transportbänder 9 miteinander verbunden sind. Die Transportbänder 9 werden vorzugsweise bei Briefen 1 oder anderen (relativ flachen) Postsendungen eingesetzt.FIG 2 shows a similar device as in FIG 1, wherein instead of the rollers 3 endless circulating conveyor belts 9 are used. Strictly speaking, the rollers 3 are still present, but these act together with other rollers 10, the roller pairs 3, 10 are connected to each other via the conveyor belts 9. The conveyor belts 9 are preferably used in letters 1 or other (relatively flat) mail items.
In FIG 3 ist ein Leistungs-Masse-Diagramm des Elektromotors 6 gezeigt, wobei der Leistungsverbrauch P in Watt W über der Masse m in Gramm g dargestellt ist. Man sieht, dass der Zusammenhang zwischen Leistung P und Masse m linear ist. Der Elektromotor 6 verbraucht proportional zur transportierten Masse des durchlaufenden Briefes 1 Energie. Die Änderung der Leistung P pro Zeiteinheit ist dabei gleich der Änderung des elektrischen Energieverbrauchs.FIG. 3 shows a power-to-mass diagram of the electric motor 6, the power consumption P being shown in watts W over the mass m in grams g. It can be seen that the relationship between power P and mass m is linear. The electric motor 6 consumes energy proportional to the transported mass of the continuous letter 1. The change in the power P per unit time is equal to the change in electrical energy consumption.
Bei Post-Sortiermaschinen wird die Motordrehzahl zur Erzielung eines entsprechend hohen Durchsatzes mittels einer Regelung konstant gehalten, was auch bei dem in der FIG 3 dargestellten linearen Zusammenhang der Fall ist. FIG 4 zeigt ein Geschwindigkeits-Zeit-Diagramm, bei dem die Geschwindigkeit V über der Zeit t aufgetragen ist. So zeigt die FIG 4 einen Geschwindigkeitsverlauf 11 und zusätzlich den zeitlichen Verlauf 12 des Motordrehmoments M. Dabei ist er- sichtlich, dass der Verlauf 12 des Motordrehmoments M einen Bereich aufweist, in dem das Motordrehmoment M konstant ist. In diesem Bereich mit konstantem Motordrehmoment M wird eine Geschwindigkeitsdifferenz V2 - Vl während des Durchgangs eines Briefes 1 zu zwei Zeitpunkten tl und t2 ermittelt. Die Motordrehzahl des Elektromotors 6 ändert sich bei schweren Briefen 1 stärker als bei leichten Briefen 1. Dabei entspricht die Motordrehzahländerung der Geschwindigkeitsänderung, die beide proportional zur Masse des Briefes 1 während eines Briefdurchlaufs sind.In post-sorting machines, the engine speed is kept constant in order to achieve a correspondingly high throughput by means of a control, which is also the case in the linear relationship shown in FIG. 4 shows a speed-time diagram in which the speed V is plotted against the time t. Thus, FIG. 4 shows a speed curve 11 and, in addition, the time profile 12 of the engine torque M. It can be seen that the curve 12 of the engine torque M has an area in which the engine torque M is constant. In this region with constant engine torque M, a speed difference V2 - V1 is determined during the passage of a letter 1 at two times t1 and t2. The engine speed of the electric motor 6 changes in heavy letters 1 stronger than light letters 1. Here, the engine speed change corresponds to the speed change, both of which are proportional to the mass of the letter 1 during a letter pass.
In der FIG 5 ist ein Geschwindigkeits-Zeit-Diagramm für den Fall dargestellt, dass der Brief mittels der Transportelemente 4 im Zeitraum tl - t2 derart beschleunigt und/oder gebremst wird, dass dessen Geschwindigkeit linear zunimmt. Nach Durchlauf des Briefes 1 oder aber nach erfolgter Beschleunigung kommt es bezüglich der Geschwindigkeit der Transportelemente 4 zu einem Überschwingen mit einer auslaufenden Schwingung 13, von der mittels des Controllers 8 die Amplitudendifferenz A der ersten Schwingung erfasst wird. Mit Hilfe einer Eichung wird der Zusammenhang zwischen der Amplitudendifferenz A und der Masse des transportierten Briefes hergestellt, der in erster Näherung proportional ist. Zur Erhöhung der Messgenauigkeit kann auch noch die Schwingungsdauer T und Dämpfung der abklingenden Schwingungen 13 berücksichtigt wer- den. Auch hierzu sind dann entsprechende Eichungen vor den eigentlichen Messungen erforderlich.FIG. 5 shows a speed-time diagram for the case in which the letter is accelerated and / or braked in the time interval t 1 -t 2 by means of the transport elements 4 in such a way that its speed increases linearly. After passage of the letter 1 or after acceleration has occurred with respect to the speed of the transport elements 4 to overshoot with an expiring vibration 13, by means of the controller 8, the amplitude difference A of the first oscillation is detected. By means of a calibration, the relationship between the amplitude difference A and the mass of the transported letter is produced, which is proportional to a first approximation. To increase the measurement accuracy, the oscillation period T and damping of the decaying oscillations 13 can also be taken into account. Also for this purpose then appropriate calibrations are required before the actual measurements.
Es ist anzumerken, dass die Geschwindigkeit V des Briefes 1 als auch der zeitliche Verlauf der Motordrehzahl sowie die Umlaufgeschwindigkeit der Transportelemente 4 dieselben normierten zeitlichen Verläufe in einem Geschwindigkeits-Zeit- Diagramm zeigen. It should be noted that the speed V of the letter 1 as well as the time course of the engine speed and the Circulation speed of the transport elements 4 show the same normalized time courses in a speed-time diagram.

Claims

Patentansprüche claims
1. Vorrichtung zur Bestimmung der Masse eines Gegenstandes (1), insbesondere einer Postsendung, mit einem Elektromotor (6) , insbesondere einer PostSortiermaschine, zum Transport des sich zwischen zwei umlaufenden Transportelementen befindenden und von den Transportelementen (4) gehaltenen Gegenstandes (1) , wobei mindestens eines der beiden Transportelemente (4) vom Elektromotor (6) angetrieben wird, mit einer Einrichtung (7) zur Messung von elektrischen Größen (P) des Elektromotors (6), die sich während des Motorbetriebs jeweils beim Durchlauf des Gegenstandes (1) ändern, wobei die Masse (m) anhand der gemesse- nen Größen (P) bestimmt wird, d a d u r c h g e k e n n z e i c h n e t, dass die Masse (m) anhand der Änderung des elektrischen Energieverbrauchs (P) des Elektromotors (6) während des Durchlaufs bestimmt wird.1. Device for determining the mass of an object (1), in particular a mail item, with an electric motor (6), in particular a post-sorting machine, for transporting the article located between two circulating transport elements and held by the transport elements (4) (1), wherein at least one of the two transport elements (4) is driven by the electric motor (6), with a device (7) for measuring electrical quantities (P) of the electric motor (6), which during the operation of the motor in each case during the passage of the article (1). in which the mass (m) is determined on the basis of the measured quantities (P), characterized in that the mass (m) is determined on the basis of the change in the electrical energy consumption (P) of the electric motor (6) during the passage.
2. Vorrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t, dass der Energieverbrauch bei konstanter Motordrehzahl bestimmt wird.2. Device according to claim 1, characterized in that the energy consumption at a constant engine speed is determined.
3. Vorrichtung zur Bestimmung der Masse eines Gegenstandes (1) , insbesondere einer Postsendung, mit einem Elektromotor (6) , insbesondere einer PostSortiermaschine, zum Transport des sich zwischen zwei endlos umlaufenden Transportelementen (4) befindenden und von den Transportelementen (4) gehaltenen Gegenstandes (1), wobei mindestens eines der beiden Transportelemente (4) vom Elektromotor (6) angetrieben wird, mit einer Einrichtung (7) zur Messung von elektrischen und dynamischen Größen (V) des Elektromotors (6), die sich während des Motorbetriebs jeweils beim Transport des Gegenstandes (6) ändern, wobei die Masse (m) anhand der gemessenen Größen (V) bestimmt wird, d a d u r c h g e k e n n z e i c h n e t, dass der Gegenstand (1) während des Transports positiv und/oder negativ beschleunigt wird und die Masse (m) anhand der Schwingungen bestimmt wird, die im zeitlichen Verlauf der Geschwindigkeit (V) des Gegenstandes (1) je- weils nach Beendigung der Beschleunigung auftreten.3. A device for determining the mass of an object (1), in particular a mail item, with an electric motor (6), in particular a PostSortiermaschine, for transporting between two endlessly circulating transport elements (4) and held by the transport elements (4) held object (1), wherein at least one of the two transport elements (4) by the electric motor (6) is driven, with a device (7) for measuring electrical and dynamic quantities (V) of the electric motor (6) which change during engine operation respectively during transport of the object (6), the mass (m) being determined from the measured quantities (V), characterized in that the object (1 ) is positively and / or negatively accelerated during transport and the mass (m) is determined from the oscillations which occur in the course of time of the velocity (V) of the object (1) each time after the acceleration has ended.
4. Vorrichtung nach Anspruch 3 , d a d u r c h g e k e n n z e i c h n e t, dass die Masse (m) anhand der Amplitudendifferenz (A) der gedämpft auslaufenden Schwingung (13) bestimmt wird.4. Device according to claim 3, characterized in that the mass (m) is determined on the basis of the amplitude difference (A) of the damped outgoing oscillation (13).
5. Vorrichtung zur Bestimmung der Masse eines Gegenstandes (1) , insbesondere einer Postsendung, mit einem Elektromotor (6), insbesondere einer Post- Sortiermaschine, zum Transport des sich zwischen zwei endlos umlaufenden Transportelementen (4) befindenden und von den Transportelementen (4) gehaltenen Gegenstandes (1) , wobei mindestens eines der beiden Transportelemente (4) vom Elektromotor (6) angetrieben wird, mit einer Einrichtung (7) zur Messung von elektrischen und dynamischen Größen (V) des Elektromotors (6), die sich während des Motorbetriebs jeweils beim Durchlauf des Gegenstandes (1) ändern, wobei die Masse (m) anhand der gemessenen Größen (V) bestimmt wird, d a d u r c h g e k e n n z e i c h n e t, dass die Masse (m) bei konstantem Motordrehmoment (M) anhand der Motordrehzahländerung während des Durchlaufs bestimmt wird, wobei die Motordrehzahländerung der Geschwindigkeitsänderung des Gegenstandes (1) entspricht und die Masse (m) proportional zur Änderung der Motordrehzahl und damit zur Änderung der Geschwindigkeit (V) ist.5. Device for determining the mass of an article (1), in particular a mail item, with an electric motor (6), in particular a post-sorting machine, for transporting the article between two endlessly circulating transport elements (4) and of the transport elements (4) held object (1), wherein at least one of the two transport elements (4) by the electric motor (6) is driven, with means (7) for measuring electrical and dynamic quantities (V) of the electric motor (6), which during the engine operation each time the article (1) passes, the mass (m) being determined from the measured quantities (V), characterized in that the mass (m) at constant engine torque (M) is determined from the change in engine speed during the run the engine speed change corresponds to the speed change of the article (1) and the mass (m) is proportional to the change in the engine speed and thus to the change in speed (V).
6. Vorrichtung nach einem der Ansprüche 1 - 5, d a d u r c h g e k e n n z e i c h n e t, dass die Transportelemente (4) endlos umlaufende Transportbänder (9) oder Rollen (3) sind.6. Device according to one of claims 1-5, d a d u r c h e k e n e c i n e c e s that the transport elements (4) endlessly circulating conveyor belts (9) or rollers (3).
7. Vorrichtung nach einem der Ansprüche 1 - 6, d a d u r c h g e k e n n z e i c h n e t, dass der Elektromotor (6) Computer- oder controllergesteuert ist. 7. Device according to one of claims 1-6, characterized in that the electric motor (6) is computer or controller controlled.
1/21.2
Figure imgf000012_0001
Figure imgf000012_0001
Figure imgf000012_0002
Figure imgf000012_0002
PCT/EP2006/008235 2005-09-13 2006-08-22 Device for determining the mass of an object, in particular an item of mail WO2007031176A1 (en)

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