EP0759003B1 - Method and device for printing markings on flat consignments - Google Patents

Method and device for printing markings on flat consignments Download PDF

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Publication number
EP0759003B1
EP0759003B1 EP96911943A EP96911943A EP0759003B1 EP 0759003 B1 EP0759003 B1 EP 0759003B1 EP 96911943 A EP96911943 A EP 96911943A EP 96911943 A EP96911943 A EP 96911943A EP 0759003 B1 EP0759003 B1 EP 0759003B1
Authority
EP
European Patent Office
Prior art keywords
printing
case
mail
belt
items
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
Application number
EP96911943A
Other languages
German (de)
French (fr)
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EP0759003A1 (en
Inventor
Josef Mok
Uwe Märtin
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 EP0759003A1 publication Critical patent/EP0759003A1/en
Application granted granted Critical
Publication of EP0759003B1 publication Critical patent/EP0759003B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B41J13/10—Sheet holders, retainers, movable guides, or stationary guides
    • B41J13/22—Clamps or grippers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0085—Using suction for maintaining printing material flat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
    • G07B17/00—Franking apparatus
    • G07B17/00459—Details relating to mailpieces in a franking system
    • G07B17/00467—Transporting mailpieces
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
    • G07B17/00—Franking apparatus
    • G07B17/00459—Details relating to mailpieces in a franking system
    • G07B17/00508—Printing or attaching on mailpieces
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
    • G07B17/00—Franking apparatus
    • G07B17/00459—Details relating to mailpieces in a franking system
    • G07B17/00508—Printing or attaching on mailpieces
    • G07B2017/00516—Details of printing apparatus
    • G07B2017/00524—Printheads
    • G07B2017/00532—Inkjet
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
    • G07B17/00—Franking apparatus
    • G07B17/00459—Details relating to mailpieces in a franking system
    • G07B17/00508—Printing or attaching on mailpieces
    • G07B2017/00516—Details of printing apparatus
    • G07B2017/00556—Ensuring quality of print
    • G07B2017/00564—Ensuring correct position of print on mailpiece

Definitions

  • the invention relates to a device for printing markings on flat shipments according to the preamble of the claim 1.
  • US-A-4 207 579 a device for printing sheets for the reproduction of documents is known, in which the sheets are conveyed past the printhead on transport belts.
  • the transport belts are perforated / have holes and under the belts on the side facing away from the print head there is a vacuum device which acts through the holes in the transport belts on the sheets to be printed and pulls them onto the transport belts so that the sheets slip on the Transport belt is avoided. If mail items with different thicknesses are also to be printed with this device, the print head has different distances from the surface to be printed and a print image according to the task could not be guaranteed.
  • US-A-4 447 817 describes a printing unit with a transport means for sheets to be printed, in which the sheets are also transported with transport belts.
  • the object of the present invention is therefore a device to create with the mailings to be printed different Thick safely with steady speed and with a predetermined distance with little effort on the print heads be transported past.
  • FIGS. 2 and 3 show a preferred embodiment of a Device according to the invention in top or side view.
  • a backdrop 1 is arranged so that the between a cover belt 2 arranged in pairs and a perforated conveyor belt 4 funded program 3 at a predetermined distance is guided past print heads 8.
  • the printing station 8a points in addition to those shown in this embodiment two print heads 8 still ink tank 7 and an ink supply system and a cleaning pump, but the following are not shown in more detail.
  • the printing stations 8a are controlled by an electronics magazine. Preferably two printing stations 8a are used, each station printed on one side of a shipment.
  • An incoming Consignment 3 triggers the signal via this light barrier 10 Express.
  • the first print head 8 begins first to press.
  • the second print head 8 begins at a time offset to press.
  • the start of printing must be coordinated be that a uniform image is created.
  • the Control of the printing process is preferably with a Synchronized clock, which is driven by the conveyor belt 4 becomes.
  • the distance of the light barrier 10 becomes the first Print head 8 or the second print head 8 in a number implemented by measures. Printing begins when the corresponding number of bars has been reached, this corresponds to again a certain way.
  • the printing process itself will controlled directly by the clock. Since the control of the It is irrelevant what speed is printed depending on the route have the shipments.
  • the Printheads 8 designed as an inkjet printer. Sitting there in the print heads 8 a pixel plate in which the nozzles 11 are arranged are that a predetermined number of these each create a pixel on the artwork.
  • a linear arrangement of nozzles 11 is preferably used, although matrix or other arrangements are also possible.
  • these are spatially offset vertically and below arranged at a predetermined angle ⁇ .
  • the distance from the light barrier 10 to the respective first nozzles 11 of the respective print head 8 becomes an electronic computer given as delay.
  • the computer converts the route into bars around.
  • the start of printing can be changed by changing the delay Heads can be adjusted.
  • Cover belt 2 and perforated conveyor belt 4 overflow Rollers 12, between which the device is arranged.
  • the Rollers 12 close the spread between Cover belt 2 and perforated conveyor belt 4.
  • the size of the normal force is determined by the spreading the conveyor belts determined by the broadcast 3. The spread leads to stretching of the ligaments. In front and behind the Program 3 will spread the conveyor belts through the Rollers 12 closed. In addition, the size is determined by the Spreading pending normal force by the distance of this determined both roles. Since the device for printing between the rollers 12 is arranged, the distance between the rollers not big enough to have a slippery shipment to ensure.
  • FIGS. 2 and 3 show a substantially in the area of the printheads 8 arranged vacuum device realized as a suction tub 5.
  • This suction pan preferably extends linearly to the area of the rollers 12 on both sides of the printing station 6, which is arranged between the rollers 12.
  • the suction pan has an opening that the conveyor belts, adapted to the cover belt 2 and the perforated conveyor belt 4 is, so that the programs 3 from the negative pressure against the Conveyor belt 4 are pressed. This is made possible by that the conveyor belt 4 rests against the backdrop, the runs over the suction pan.
  • the opening is as Perforated sheet executed.
  • the suction pan extends longer than the backdrop.
  • the opening of the vacuum device 5, i.e. essentially the suction pan is such on cover belt 2 and conveyor belt 4th adjusted that programs 3 from the negative pressure against the perforated conveyor belt 4 are pressed, however, that if no shipment 3 is in front of the vacuum device 5 The holes in the perforated conveyor belt are closed.
  • the vacuum device 5 increases the normal force on the mail items, since the mail items are sucked in by the conveyor belt running over the backdrop.
  • the magnitude of the additional normal force is at least a factor 10 higher than any force achieved by the conveyor belts alone.
  • FIG. 4 A situation is shown in which there is a hole between the holes Conveyor belt 4 and the cover belt 2 a thicker shipment 3 is clamped. With proper operation, the Opening the suction pan through the shipment 3 and the cover tape 2 closed. However, is a thick shipment 3 between the Conveyor belts clamped, can be in front of and behind the broadcast 3 Opening wedge 18 arise. In this case, the cover tape 2 do not close the opening wedge 18, causing holes in the Conveyor belt 4 are not covered. This creates a leak that causes the pressure to drop.
  • FIG. 5 shows schematically a suction pressure setting device for Connection to the suction chamber.
  • a vacuum is applied to a pump 20 generated, which is kept constant by a vacuum valve 21 becomes. If a certain negative pressure is reached, it opens the vacuum valve 21 and air is via a Bypass 22 sucked. The vacuum remains constant. Breaks by leaking the pressure together, the bypass 22 is closed. Since a large volume flow is conveyed there are only slight fluctuations in pressure.

Description

Die Erfindung betrifft eine Vorrichtung zum Drucken von Markierungen auf flache Sendungen nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for printing markings on flat shipments according to the preamble of the claim 1.

Zum Entwerten von Briefmarken können mechanische Drucker eingesetzt werden, wobei allerdings das Stempel-Layout sehr eingeschränkt ist. Alternativ dazu besteht die Möglichkeit, berührungslose Drucksysteme, insbesondere Tintenstrahldrucker, zu verwenden, mit denen hohe Druckqualitäten erreichbar sind und eine freie Gestaltung des Stempel-Layouts möglich ist. Vorteilhaft bei diesem System ist der geringere Verschleiß gegenüber mechanischen Systemen. Attraktiv ist insbesondere die Verwendung von Drucksystemen mit einer freien Gestaltung des Stempel-Layouts, wenn auf der einen Seite einer Sendung Briefmarken entwertet und auf der gleichen oder der anderen Seite Werbung aufgedruckt werden soll. In einem solchen Fall können die Werbelogos von Sendung zu Sendung wechseln, damit je nach Bestimmungsort unterschiedliche Kundenkreise angesprochen werden können.Mechanical printers can be used to cancel stamps , but the stamp layout is very limited is. Alternatively, there is the option of non-contact Printing systems, in particular inkjet printers, to be used with which high print quality can be achieved and a free design of the stamp layout is possible. The advantage of this system is the lower wear compared to mechanical systems. It is particularly attractive the use of printing systems with a free design the stamp layout if on one side of a shipment Postage stamps canceled and on the same or the other Page advertising should be printed. In such a case can change the advertising logos from broadcast to broadcast, so different customer groups are addressed depending on the destination can be.

Um eine hohe Druckqualität zu erreichen, ist es bei Tintenstrahldruckern erforderlich, daß die Sendungen in einem vorgegebenen Abstand, z.B. von 0,5 mm möglichst ruhig an den Druckköpfen vorbeigeführt werden. Dabei ist von Bedeutung, daß die Sendungen mit einer mit der Steuerung der Druckköpfe synchronisierten vorgegebenen Geschwindigkeit gefördert werden. Insbesondere dann, wenn die Sendungsförderung über paarweise angeordnete Förderbänder erfolgt, zwischen denen die Sendungen reibschlüssig mitgezogen werden, besteht das Prblem, daß eine Differenzgeschwindigkeit zwischen den Förderbändern und den Sendungen entsteht. Eine solche Differenzgeschwindigkeit wirkt sich besonders nachteilig aus, wenn durch verschiedene Druckköpfe, die hintereinander angeordnet sind und zeitlich zueinander versetzt drucken, eine einheitliche Markierung auf die Sendungen aufgebracht werden soll.To achieve high print quality, it is with inkjet printers required that the shipments in a predetermined Distance, e.g. of 0.5 mm as quietly as possible Printheads are passed. It is important that the shipments with one with the control of the printheads synchronized predetermined speed are promoted. Especially when the shipment is funded in pairs arranged conveyor belts, between which the Consignments are dragged along frictionally, there is Problem that a differential speed between the conveyor belts and the broadcasts are created. Such a difference in speed is particularly detrimental if through different printheads arranged one behind the other and are staggered in time to print, a uniform Marking should be applied to the shipments.

Aus der US-A-4 207 579 ist eine Einrichtung zum Bedrucken von Blättern für die Reproduktion von Dokumenten bekannt, bei der die Blätter auf Transportriemen am Druckkopf vorbeigeführt werden. Die Transportriemen sind perforiert/besitzen Löcher und unter den Riemen auf der dem Druckkopf abgewandten Seite befindet sich eine Unterdruckeinrichtung, die durch die Löcher in den Transportriemen auf die zu bedruckenden Blätter einwirkt und diese an die Transportriemen zieht, so daß ein Verrutschen der Blätter auf den Transportriemen vermieden wird. Sollen mit dieser Einrichtung auch Sendungen mit unterschiedlicher Dicke bedruckt werden, so hat der Druckkopf unterschiedliche Abstände von der zu bedruckenden Oberfläche und ein aufgabengemäßes Druckbild könnte nicht gewährleistet werden.
In der US-A-4 447 817 ist eine Druckeinheit mit einem Transportmittel für zu bedruckende Blätter beschrieben, bei dem die Blätter ebenfalls mit Transportriemen transportiert werden. Damit ein rutschfreier Transport gesichert ist, befinden sich hinter den perforierten Transportriemen auf der dem Druckkopf abgewandten Riemenseite in Transportrichtung vor und hinter dem Druckkopf jeweils eine Unterdruckkammer. Der Unterdruck saugt die Blätter fest an die Riemen und verhindert damit ein Rutschen. Am Druckkopf befindet sich eine Kulisse mit Kanälen und Öffnungen, die an eine dritte Unterdruckkammer, die sich auf der Druckerseite befindet, angeschlossen sind.
Der Unterdruck in der Kulisse sorgt dafür, daß die zu bedruckenden Blätter im Druckbereich an der Kulisse anliegen und somit immer ein definierter Abstand zu den Druckdrüsen gewährleistet ist. Nachteilig hierbei ist die Notwendigkeit von drei Unterdruckkammern sowie die Nichtbedruckbarkeit von Sendungen mit einem relativ großen Dickenspektrum, da nur ein geringer Spalt am Druckkopf für das zu bedruckende Material vorhanden ist. Beide bekannten Druckeinrichtungen sind auch nicht geeignet, in hoher Geschwindigkeit an den Druckköpfen vorbeibewegte Sendungen zu bedrucken.From US-A-4 207 579 a device for printing sheets for the reproduction of documents is known, in which the sheets are conveyed past the printhead on transport belts. The transport belts are perforated / have holes and under the belts on the side facing away from the print head there is a vacuum device which acts through the holes in the transport belts on the sheets to be printed and pulls them onto the transport belts so that the sheets slip on the Transport belt is avoided. If mail items with different thicknesses are also to be printed with this device, the print head has different distances from the surface to be printed and a print image according to the task could not be guaranteed.
US-A-4 447 817 describes a printing unit with a transport means for sheets to be printed, in which the sheets are also transported with transport belts. To ensure non-slip transport, there is a vacuum chamber behind the perforated transport belt on the belt side facing away from the print head in the transport direction and behind the print head. The negative pressure sucks the leaves firmly onto the straps, preventing them from slipping. At the print head there is a backdrop with channels and openings that are connected to a third vacuum chamber, which is located on the printer side.
The negative pressure in the backdrop ensures that the sheets to be printed abut the backdrop in the printing area and thus a defined distance from the printing glands is always guaranteed. The disadvantage here is the need for three vacuum chambers and the non-printability of mail items with a relatively large thickness range, since there is only a small gap on the print head for the material to be printed. Both known printing devices are also not suitable for printing on mail items that have moved past the print heads at high speed.

Aufgabe der vorliegenden Erfindung ist es daher, eine Vorrichtung zu schaffen, mit der zu bedruckende Sendungen unterschiedlicher Dicke sicher mit gleichmäßiger Geschwindigkeit und mit vorgegebenem Abstand aufwandsarm an den Druckköpfen vorbeitransportiert werden.The object of the present invention is therefore a device to create with the mailings to be printed different Thick safely with steady speed and with a predetermined distance with little effort on the print heads be transported past.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Patentanspruchs 1 gelöst. Vorteilhafte Ausführungen der Erfindung sind den Unteransprüchen sowie der Beschreibung und den Zeichnungen zu entnehmen.This object is achieved by the features of the claim 1 solved. Advantageous embodiments of the invention are the dependent claims as well as the description and the Take drawings.

Die zur Erläuterung der Erfindung verwendeten Zeichnungen zeigen in

FIG 1
ein Beispiel eines zeitlich korrekt ausgeführten und eines nicht korrekt ausgeführten Druckes durch zwei zeitlich versetzt druckende Druckköpfe
FIG 2
eine Obenansicht einer erfindungsgemäßen Vorrichtung
FIG 3
eine Seitenansicht einer erfindungsgemäßen Vorrichtung
FIG 4
eine Detaildarstellung der Öffnungszeit bei einer dicken Sendung
FIG 5
eine Ausführungsform einer Saugdruckeinstellvorrichtung zur Konstanthaltung der Normalkraft auf die Sendung.
The drawings used to explain the invention show in
FIG. 1
an example of a correctly executed and an incorrectly executed print by two staggered printing heads
FIG 2
a top view of a device according to the invention
FIG 3
a side view of a device according to the invention
FIG 4
a detailed representation of the opening time for a thick shipment
FIG 5
an embodiment of a Saugdruckeinstellvorrichtung to keep the normal force on the shipment.

Die FIG 1 zeigt die Unterschiede zwischen zeitlich korrekt und zeitlich nicht korrekt ausgeführten Drucken durch zwei zeitlich versetzt druckende Druckköpfe. Letzterer zeigt eine Versetzung der beiden Druckbilder gegeneinander. Bei ansonsten korrekter Ansteuerung der Druckköpfe entsteht eine solche Versetzung, wenn zwischen Sendung und den zum Transport verwendeten Förderbändern Schlupf entstanden war.1 shows the differences between correct in time and timely incorrect prints by two printheads printing at different times. The latter shows one Offset the two printed images against each other. Otherwise Correct control of the print heads creates such Transfer if between shipment and for transportation used conveyor belts had emerged.

Die FIG 2 und 3 zeigen eine bevorzugte Ausführungsform einer erfindungsgemäßen Vorrichtung in Oben- bzw. Seitenansicht. Hierbei ist eine Kulisse 1 so angeordnet, daß die zwischen einem paarweise angeordneten Deckband 2 und gelochtem Transportband 4 geförderte Sendung 3 in einem vorgegebenen Abstand an Druckköpfen 8 vorbeigeführt wird. Die Druckstation 8a weist neben den in diesem Ausführungsbeispiel dargestellten zwei Druckköpfen 8 noch Tintenbehälter 7 sowie ein Tintenzuführsystem und eine Reinigungspumpe auf, die jedoch im folgenden nicht genauer dargestellt werden. Die Druckstationen 8a werden von einem Elektronikmagazin gesteuert. Vorzugsweise werden zwei Druckstationen 8a eingesetzt, wobei jede Station eine Seite einer Sendung bedruckt. Zur Steuerung des Druckbeginns wird eine Lichtschranke 10 eingesetzt. Eine einlaufende Sendung 3 löst über diese Lichtschranke 10 das Signal zum Drucken aus. Dabei beginnt zuerst der erste Druckkopf 8 zu drucken. Zeitlich versetzt beginnt der zweite Druckkopf 8 zu drucken. Die Druckbeginne müssen dabei so aufeinander abgestimmt sein, daß ein einheitliches Bild erzeugt wird. Die Steuerung des Druckvorganges wird vorzugsweise mit einem Taktgeber synchronisiert, der vom Transportband 4 angetrieben wird. Dabei wird die Entfernung der Lichtschranke 10 zum ersten Druckkopf 8 bzw. zum zweiten Druckkopf 8 in eine Anzahl von Takten umgesetzt. Der Beginn des Druckens setzt ein, wenn die entsprechende Anzahl Takte erreicht ist, dies entspricht wiederum einem bestimmten Weg. Der Druckvorgang selbst wird direkt durch den Taktgeber gesteuert. Da die Steuerung des Druckens wegabhängig erfolgt, ist es unerheblich, welche Geschwindigkeit die Sendungen haben. Vorzugsweise sind die Druckköpfe 8 als Tintenstrahldrucker ausgeführt. Dabei sitzt in den Druckköpfen 8 eine Pixelplatte, in der Düsen 11 so angeordnet sind, daß eine vorgegebene Anzahl von diesen jeweils einen Pixel auf der Druckvorlage erzeugen. 2 and 3 show a preferred embodiment of a Device according to the invention in top or side view. Here, a backdrop 1 is arranged so that the between a cover belt 2 arranged in pairs and a perforated conveyor belt 4 funded program 3 at a predetermined distance is guided past print heads 8. The printing station 8a points in addition to those shown in this embodiment two print heads 8 still ink tank 7 and an ink supply system and a cleaning pump, but the following are not shown in more detail. The printing stations 8a are controlled by an electronics magazine. Preferably two printing stations 8a are used, each station printed on one side of a shipment. To control the start of printing a light barrier 10 is used. An incoming Consignment 3 triggers the signal via this light barrier 10 Express. The first print head 8 begins first to press. The second print head 8 begins at a time offset to press. The start of printing must be coordinated be that a uniform image is created. The Control of the printing process is preferably with a Synchronized clock, which is driven by the conveyor belt 4 becomes. The distance of the light barrier 10 becomes the first Print head 8 or the second print head 8 in a number implemented by measures. Printing begins when the corresponding number of bars has been reached, this corresponds to again a certain way. The printing process itself will controlled directly by the clock. Since the control of the It is irrelevant what speed is printed depending on the route have the shipments. Preferably, the Printheads 8 designed as an inkjet printer. Sitting there in the print heads 8 a pixel plate in which the nozzles 11 are arranged are that a predetermined number of these each create a pixel on the artwork.

Bevorzugt wird eine lineare Anordnung von Düsen 11 verwendet, obwohl auch Matrix- oder andere Anordnungen möglich sind. Für den Druck eines einheitlichen Bildes durch zwei Druckköpfe 8 werden diese räumlich entsprechend senkrecht versetzt und unter einem vorgegebenen Winkel  angeordnet. Der Abstand von der Lichtschranke 10 zu den jeweiligen ersten Düsen 11 des jeweiligen Druckkopfes 8 wird einem elektronischen Rechner als Delay angegeben. Der Rechner wandelt die Strecke in Takte um. Durch eine Änderung des Delays kann der Druckbeginn der Köpfe jeweils justiert werden.A linear arrangement of nozzles 11 is preferably used, although matrix or other arrangements are also possible. For the printing of a uniform image by two print heads 8 these are spatially offset vertically and below arranged at a predetermined angle Â. The distance from the light barrier 10 to the respective first nozzles 11 of the respective print head 8 becomes an electronic computer given as delay. The computer converts the route into bars around. The start of printing can be changed by changing the delay Heads can be adjusted.

Deckband 2 und gelochtes Transportband 4 laufen über Rollen 12, zwischen denen die Vorrichtung angeordnet ist. Die Rollen 12 bewirken ein Schließen der Aufspreizung zwischen Deckband 2 und gelochtem Transportband 4.Cover belt 2 and perforated conveyor belt 4 overflow Rollers 12, between which the device is arranged. The Rollers 12 close the spread between Cover belt 2 and perforated conveyor belt 4.

Zwischen den Förderbändern, gemäß FIG 2 und 3, dem Deckband 2 und Transportband 4, besteht eine Sendungshaltekraft, die abhängig ist von dem Reibkoeffizienten µ und der Normalkraft FN. Diese Normalkraft setzt sich üblicherweise aus zwei Teilen zusammen, der Normalkraft infolge der Dehnung der Transportbänder FN1 und infolge der Vorspannung der Bänder FN2. Das gilt: FR = J · µ (FN1 + FN2). Between the conveyor belts, as shown in FIGS. 2 and 3, the cover belt 2 and the conveyor belt 4, there is a mail holding force which is dependent on the coefficient of friction μ and the normal force FN. This normal force is usually composed of two parts, the normal force due to the stretching of the conveyor belts FN 1 and due to the pretensioning of the belts FN 2 . That applies: FR = J · µ (FN 1 + FN 2nd ).

Der Faktor J beschreibt die Anzahl der Reibflächenpaare, J = 2. Die Größe der Normalkraft wird durch die Aufspreizung der Förderbänder durch die Sendung 3 bestimmt. Die Aufspreizung führt zu einer Dehnung der Bänder. Vor und hinter der Sendung 3 wird die Aufspreizung der Förderbänder durch die Rollen 12 geschlossen. Zusätzlich ist die Größe der durch die Aufspreizung anstehenden Normalkraft durch den Abstand dieser beiden Rollen bestimmt. Da die Vorrichtung zum Drucken zwischen den Rollen 12 angeordnet ist, ist der Abstand der Rollen nicht groß genug, um eine schlupfreiche Sendungsführung zu gewährleisten. The factor J describes the number of friction surface pairs, J = 2. The size of the normal force is determined by the spreading the conveyor belts determined by the broadcast 3. The spread leads to stretching of the ligaments. In front and behind the Program 3 will spread the conveyor belts through the Rollers 12 closed. In addition, the size is determined by the Spreading pending normal force by the distance of this determined both roles. Since the device for printing between the rollers 12 is arranged, the distance between the rollers not big enough to have a slippery shipment to ensure.

FIG 2 und 3 zeigen eine im wesentlichen im Bereich der Druckköpfe 8 angeordnete, als Saugwanne realisierte Unterdruckvorrichtung 5. Vorzugsweise erstreckt sich diese Saugwanne linear bis in den Bereich der Rollen 12 beidseitig zur Druckstation 6, die zwischen den Rollen 12 angeordnet ist.2 and 3 show a substantially in the area of the printheads 8 arranged vacuum device realized as a suction tub 5. This suction pan preferably extends linearly to the area of the rollers 12 on both sides of the printing station 6, which is arranged between the rollers 12.

Die Saugwanne weist eine Öffnung auf, die den Förderbändern, dem Deckband 2 und dem gelochten Transportband 4 angepaßt ist, so daß die Sendungen 3 von dem Unterdruck gegen das Transportband 4 gedrückt werden. Dies wird dadurch ermöglicht, daß das Transportband 4 an der Kulisse anliegt, die über die Saugwanne läuft. Vorzugsweise ist die Öffnung als Lochblech ausgeführt.The suction pan has an opening that the conveyor belts, adapted to the cover belt 2 and the perforated conveyor belt 4 is, so that the programs 3 from the negative pressure against the Conveyor belt 4 are pressed. This is made possible by that the conveyor belt 4 rests against the backdrop, the runs over the suction pan. Preferably the opening is as Perforated sheet executed.

Um eine möglichst lange Führung der Sendung 3 zu gewährleisten, erstreckt sich die Saugwanne länger als die Kulisse. Die Öffnung der Unterdruckvorrichtung 5, d.h. im wesentlichen die Saugwanne, ist derartig an Deckband 2 und Transportband 4 angepaßt, daß Sendungen 3 zwar von dem Unterdruck gegen das gelochte Transportband 4 gedrückt werden, daß jedoch, wenn keine Sendung 3 vor der Unterdruckvorrichtung 5 steht, ein Verschluß der Löcher des gelochten Transportbandes erfolgt.In order to ensure that shipment 3 is kept as long as possible, the suction pan extends longer than the backdrop. The opening of the vacuum device 5, i.e. essentially the suction pan is such on cover belt 2 and conveyor belt 4th adjusted that programs 3 from the negative pressure against the perforated conveyor belt 4 are pressed, however, that if no shipment 3 is in front of the vacuum device 5 The holes in the perforated conveyor belt are closed.

Durch die Unterdruckvorrichtung 5 wird eine Erhöhung der Normalkraft auf die Sendungen erreicht, da die Sendungen durch das über die Kulisse laufende Transportband angesaugt werden. Die Treibkraft wird daher zu FR = J · µ · (FN1 + FN2 + FS), wobei FS die durch die Unterdruckvorrichtung 5 erzeugte Normalkraft bezeichnet. Die Größe der zusätzlichen Normalkraft liegt mindestens um einen Faktor 10 höher als je durch die Förderbänder allein erreichten Kräfte.The vacuum device 5 increases the normal force on the mail items, since the mail items are sucked in by the conveyor belt running over the backdrop. The driving force is therefore too FR = J · µ · (FN 1 + FN 2nd + FS), where FS denotes the normal force generated by the vacuum device 5. The magnitude of the additional normal force is at least a factor 10 higher than any force achieved by the conveyor belts alone.

In FIG 4 ist eine Situation gezeigt, bei der zwischen dem gelochten Transportband 4 und dem Deckband 2 eine dickere Sendung 3 beigeklemmt ist. Bei ordnungsgemäßem Betrieb wird die Öffnung der Saugwanne durch die Sendung 3 und das Deckband 2 geschlossen. Ist jedoch eine dicke Sendung 3 zwischen die Förderbänder geklemmt, kann vor und hinter der Sendung 3 ein Öffnungskeil 18 entstehen. In diesem Fall kann das Deckband 2 den Öffnungskeil 18 nicht schließen, wodurch Löcher des Transportbandes 4 nicht abgedeckt werden. Dadurch entsteht eine Leckage, die zum Absenken des Drucks führt.A situation is shown in FIG. 4 in which there is a hole between the holes Conveyor belt 4 and the cover belt 2 a thicker shipment 3 is clamped. With proper operation, the Opening the suction pan through the shipment 3 and the cover tape 2 closed. However, is a thick shipment 3 between the Conveyor belts clamped, can be in front of and behind the broadcast 3 Opening wedge 18 arise. In this case, the cover tape 2 do not close the opening wedge 18, causing holes in the Conveyor belt 4 are not covered. This creates a leak that causes the pressure to drop.

FIG 5 zeigt schematisch eine Saugdruckeinstellvorrichtung zum Anschluß an die Saugkammer. An einer Pumpe 20 wird ein Unterdruck erzeugt, der durch ein Unterdruckventil 21 konstant gehalten wird. Ist ein bestimmter Unterdruck erreicht, so öffnet das Unterdruckventil 21 und Luft wird über einen Bypass 22 angesaugt. Der Unterdruck bleibt konstant. Bricht durch Leckage der Druck zusammen, wird der Bypass 22 geschlossen. Da ein großer Volumenstrom gefördert wird, sind nur geringe Druckschwankungen vorhanden.5 shows schematically a suction pressure setting device for Connection to the suction chamber. A vacuum is applied to a pump 20 generated, which is kept constant by a vacuum valve 21 becomes. If a certain negative pressure is reached, it opens the vacuum valve 21 and air is via a Bypass 22 sucked. The vacuum remains constant. Breaks by leaking the pressure together, the bypass 22 is closed. Since a large volume flow is conveyed there are only slight fluctuations in pressure.

Um eine einheitlich gute Druckqualität zu erreichen, ist zusätzlich zu den bereits erwähnten Förderbändern ein Rundriemen 9 vorgesehen, um die Sendungen im unteren Teil zusätzlich an die Kulisse 1 zu drücken. Dies ist insbesondere sinnvoll, wenn wie in FIG 3 ersichtlich, die Förderbänder 2 und 4 über den Druckköpfen 8 liegen. Durch den Rundriemen 9 wird eine zusätzliche Beruhigung der Sendung und eine höhere Druckqualität erreicht. Vorzugsweise ist der Rundriemen 9 mit dem Transportband 4 gekoppelt.To achieve a consistently good print quality, is additional a round belt for the conveyor belts already mentioned 9 provided in addition to the shipments in the lower part to push the backdrop 1. This is particularly useful if, as shown in FIG 3, the conveyor belts 2 and 4 over the print heads 8 are. Through the round belt 9 is a additional calming of the shipment and higher print quality reached. Preferably, the round belt 9 with the Conveyor belt 4 coupled.

Claims (9)

  1. Apparatus for printing markings on flat items of mail (3), having one or more printing stations (8a) which have at least one printing head (8), in the case of which the items of mail (3) are individually transported past the printing stations (8a), by means of a conveying device with a perforated transporting belt (4), and in the process are guided on a guide (1) arranged parallel to the printing surfaces of the printing heads (8), and in the case of which, in the respective printing station (8a), a negative-pressure device (5) is arranged behind the perforated transporting belt (4) and, by means of negative pressure, exerts a normal force on the items of mail essentially perpendicularly with respect to the conveying direction of said items of mail, characterized in that
    in addition to the perforated transporting belt (4), the conveying device also contains a cover belt (2), the two belts being paired together and drawing along the items of mail (3) in a frictionally locking manner between them,
    the negative-pressure device (5), the guide (1) and the printing heads (8) are located on the side directed towards the perforated transporting belt (4),
    the conveying device and the negative-pressure device (5) arranged behind it are located to the side of the printing heads (8) in the transporting direction,
    the opening of the negative-pressure device (5) is adapted to the width of the perforation region of the transporting belt (4).
  2. Apparatus according to Claim 1, it being the case that the cover belt (2) is of a width which covers the transporting-belt perforations, with the result that the cover belt (2) closes the perforations of the transporting belt (4) when there is no item of mail (3) located in front of the negative-pressure device (5).
  3. Apparatus according to one of Claims 1 and 2, it being the case that, in the region of each printing station (8a), the guide (1) is arranged such that the surface of the items of mail (3) which is to be printed in each case is spaced apart from the printing heads (8) by a predetermined distance.
  4. Apparatus according to one of Claims 1 to 3, it being the case that a suction-pressure-setting device is provided in order to keep the normal force constant.
  5. Apparatus according to one of Claims 1 to 4, it being the case that ink jet printers are provided as the printing heads (8).
  6. Apparatus according to Claim 5, it being the case that the printing heads (8) are each arranged at a predetermined angle α with respect to the transporting direction.
  7. Apparatus according to one of the preceding claims, it being the case that each printing station (8a) has at least two printing heads (8), which are arranged one behind the other in the transporting direction and each print at discrete points in time.
  8. Apparatus according to Claim 7, it being the case that the printing heads (8) print at discrete points in time such that a coherent marking is printed.
  9. Printing apparatus for printing markings on flat items of mail, it being the case that at least two apparatuses according to one of Claims 1 to 8 are provided and one of these apparatuses is provided for printing in each case one side of the items of mail (3).
EP96911943A 1995-03-09 1996-03-07 Method and device for printing markings on flat consignments Expired - Lifetime EP0759003B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19508180 1995-03-09
DE19508180A DE19508180C2 (en) 1995-03-09 1995-03-09 Device for printing markings on flat mail items with suction belt transport
PCT/EP1996/000975 WO1996028374A1 (en) 1995-03-09 1996-03-07 Method and device for printing markings on flat consignments

Publications (2)

Publication Number Publication Date
EP0759003A1 EP0759003A1 (en) 1997-02-26
EP0759003B1 true EP0759003B1 (en) 1999-06-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96911943A Expired - Lifetime EP0759003B1 (en) 1995-03-09 1996-03-07 Method and device for printing markings on flat consignments

Country Status (5)

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US (1) US5883643A (en)
EP (1) EP0759003B1 (en)
JP (1) JP3775511B2 (en)
DE (2) DE19508180C2 (en)
WO (1) WO1996028374A1 (en)

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DE19925681C2 (en) * 1998-05-15 2002-09-12 Francotyp Postalia Ag Device for printing postal matter
DE19823359C1 (en) 1998-05-15 1999-10-07 Francotyp Postalia Gmbh Apparatus for printing on items of postage esp. a franking or addressing machine
DE10032856A1 (en) * 2000-07-06 2002-01-17 Francotyp Postalia Gmbh Device for transporting recording medium or carrier e.g. for digital ink-jet printer, has transport roller operating with spring-loaded counter print roller
DE10146842B4 (en) * 2001-09-24 2006-11-09 Deutsche Post Ag Method and device for printing on postal items
EP1602499A3 (en) * 2004-04-30 2005-12-21 Agfa-Gevaert Colour proofer with curl control means
DE102008056904A1 (en) * 2008-10-17 2010-04-22 Siemens Aktiengesellschaft Method and device for printing a mail item in a transport process
WO2018233825A1 (en) * 2017-06-21 2018-12-27 Hp Indigo B.V. Vacuum tables
CN113173003B (en) * 2021-04-20 2022-09-16 河南省邮电科技有限公司 Stamp production personalized code spraying system

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US8038237B2 (en) 2007-12-17 2011-10-18 Francotyp-Postalia Gmbh Transport apparatus for flat materials to be printed

Also Published As

Publication number Publication date
DE19508180C2 (en) 1998-10-01
JPH10500384A (en) 1998-01-13
JP3775511B2 (en) 2006-05-17
WO1996028374A1 (en) 1996-09-19
EP0759003A1 (en) 1997-02-26
DE19508180A1 (en) 1996-09-12
DE59602059D1 (en) 1999-07-08
US5883643A (en) 1999-03-16

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