EP0759003A1 - Method and device for printing markings on flat consignments - Google Patents

Method and device for printing markings on flat consignments

Info

Publication number
EP0759003A1
EP0759003A1 EP96911943A EP96911943A EP0759003A1 EP 0759003 A1 EP0759003 A1 EP 0759003A1 EP 96911943 A EP96911943 A EP 96911943A EP 96911943 A EP96911943 A EP 96911943A EP 0759003 A1 EP0759003 A1 EP 0759003A1
Authority
EP
European Patent Office
Prior art keywords
printing
mail items
conveyor belt
vacuum
print
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.)
Granted
Application number
EP96911943A
Other languages
German (de)
French (fr)
Other versions
EP0759003B1 (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
Original Assignee
Licentia Patent Verwaltungs GmbH
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Licentia Patent Verwaltungs GmbH, Siemens AG filed Critical Licentia Patent Verwaltungs GmbH
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

Links

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 an apparatus and a method for printing markings on flat mail items according to the preamble of claims 1 and 11.
  • Mechanical printers can be used to cancel stamps, although the stamp layout is very limited.
  • contactless printing systems in particular inkjet printers, 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.
  • the use of printing systems with a free design of the stamp layout is particularly attractive if stamps are to be canceled on one side of a consignment and advertising is to be printed on the same side or on the other side. In such a case, the advertising logos can change from shipment to shipment, so that different customer groups can be addressed depending on the destination.
  • the mail items are at a predetermined distance, e.g. of 0.5 mm as quietly as possible past the printheads. It is important that the mail items are conveyed at a predetermined speed synchronized with the control of the print heads.
  • the transmission is carried out via conveyor belts arranged in pairs, between which the shipments are frictionally drawn, there is the problem that a differential speed arises between the conveyor belts and the shipments.
  • Such a speed of difference has a particularly disadvantageous effect if a uniform marking is to be applied to the mailpieces by means of various print heads which are arranged one behind the other and which print at different times.
  • the object of the present invention is therefore to provide a device and a method with which a safe and quiet conveyance of the mail items with a predetermined distance from the print heads is achieved.
  • FIG. 1 shows an example of a time correctly executed and a non-coctively executed print by two time-delayed printing heads
  • FIG. 2 shows a top view of a device according to the invention
  • FIG. 3 shows a side view of a device according to the invention
  • Fig. 4 is a detailed representation of the opening time for a thick program
  • FIG. 5 shows an embodiment of a suction pressure adjusting device for constant normal force on the mailpiece.
  • Fig. 1 shows the differences between correctly timed and incorrectly executed prints by two staggered printing heads. The latter shows an offset of the two printed images against each other. If the printheads are otherwise controlled correctly, such a displacement occurs if there is slippage between the consignment and the conveyor belts used for transport.
  • Figures 2 and 3 show a preferred embodiment of a device according to the invention in top and side views.
  • a backdrop 1 is arranged so that the mailing 3 conveyed between the cover belt 2 arranged in pairs and the perforated conveyor belt 4 is guided past the print heads 8 at a predetermined distance.
  • the printing station 8a also has ink containers 7 and an ink supply system and a cleaning pump, which are not shown in the following.
  • the Druckstatione ⁇ are controlled by an electronic magazine. Preferably, two printing stations are used, each station requiring one side of a shipment.
  • a light barrier 10 is used to control the start of printing. An incoming shipment triggers the signal for printing via this light barrier.
  • the first printhead starts to print.
  • the second print head starts printing at different times. The start of printing must be coordinated so that a uniform image is generated.
  • the control of the printing process is preferably synchronized with a clock generator, which is driven by the conveyor belt 4.
  • the distance from the light barrier 10 to the first print head or to the second print head is converted into a number of cycles. Printing begins when the corresponding number of bars has been reached. this in turn corresponds to a certain way.
  • the Druckvorga ⁇ g itself is controlled directly by the clock.
  • the print heads are preferably designed as inkjet printers.
  • a pixel plate is located in the print heads, in which nozzles 11 are arranged so that a predetermined number of these each produce a pixel on the previous day of printing.
  • a linear arrangement of nozzles is preferably used, although matrix or other arrangements are also possible.
  • these are spatially offset vertically and arranged at a predetermined angle ⁇ .
  • the distance from the light barrier 10 to the respective first nozzles of the respective print head is given to an electronic computer as a delay.
  • the computer converts the route into bars.
  • the start of printing of the heads can be adjusted by changing the deiays.
  • Cover belt 2 and perforated conveyor belt 4 run over 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 of the conveyor belts by the belt. The spreading leads to a separation of the bands. In front of and behind the shipment, the spreading of the conveyor belts is closed by the rollers 12. In addition, the size of the normal force due to the excitation is determined by the distance between these two rollers. Since the device for printing is arranged between the rollers 12, the distance between the rollers is not large enough to guarantee a smooth transmission.
  • FIGS. 2 and 3 show a suction trough 5 arranged essentially in the region of the pressure heads. This suction trough extends linearly up to the region of the rollers 12 on both sides of the printing station 6, which is arranged between the rollers 12
  • the Saugwa ⁇ ne 5 has an opening which is adapted to the conveyor belts, the cover belt 2 and the perforated conveyor belt 4, so that the mail items are pressed against the conveyor belt 4 by the oppression. This is made possible by the fact that the conveyor belt 4 lies against the backdrop that runs over the suction wall.
  • the opening is preferably designed as a perforated plate.
  • the suction pan extends longer than the backdrop.
  • the opening of the vacuum device ie essentially the suction trough, is adapted to the cover belt and conveyor belt in such a way that mail items are pressed against the perforated belt by the vacuum, but that, if no shipment is in front of the vacuum device, the holes in the perforated conveyor belt are closed he follows
  • the U ⁇ terbuchvorrichtu ⁇ g is an increase in the normal force on the
  • the driving force is therefore too
  • F R j - ⁇ - (F N1 + F N2 F s ), where FS denotes the normal force generated by the negative pressure device.
  • the size of the additional normal force is at least one
  • FIG. 4 shows a situation in which a thicker consignment is clamped between the perforated conveyor belt here and the cover tape 2.
  • the opening of the suction pan is closed by the mail and the cover tape 2.
  • an opening key 18 can arise in front of and behind the consignment.
  • the cover belt 2 cannot close the wedge 18, as a result of which holes in the conveyor belt F 4 are not covered. This creates a leak that leads to a drop in pressure.
  • Fig. 5 shows schematically a Saug réelleei ⁇ stellvorraum for connection to the suction chamber.
  • a vacuum is generated at the pump 20 and is kept constant by the vacuum valve 21. If a certain negative pressure is reached, the negative pressure valve opens and air is sucked in via a bypass 22. The vacuum remains constant. If the pressure collapses due to leakage, the bypass 22 is closed. Since a large volume flow is conveyed, there are only slight pressure fluctuations.
  • a belt 9 is provided in addition to the conveyor belts already mentioned, in order to additionally press the mail items against the backdrop 1 in the lower part. This is particularly useful if, as can be seen in FIG. 3, the conveyor belts 2 and 4 lie over the print heads.
  • the round belt 9 achieves additional calming of the shipment and higher print quality.
  • the round belt 9 is preferably coupled to the conveyor belt 4.

Abstract

The invention concerns a device for printing markings on flat consignments, said device comprising one or a plurality of printing stations which each comprise at least one print head (8), the consignments being guided individually past the printing stations by a conveyor and abutting a sliding element (1). Disposed in the region of the printing station is a vacuum device (5) which, by means of a vacuum, exerts on the consignments a normal force substantially perpendicular to the direction in which the consignments are conveyed towards the printing stations.

Description

Vorrichtung und Verfahren zum Drucken von Markierungen auf flache Device and method for printing markings on flat surfaces
Sendungenbroadcasts
Beschreibungdescription
Die Erfindung betrifft eine Vorrichtung und ein Verfahren zum Drucken von Markierungen auf flache Sendungen nach dem Oberbegriff der Ansprüche 1 und 11.The invention relates to an apparatus and a method for printing markings on flat mail items according to the preamble of claims 1 and 11.
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 Drucksystemeπ mit einer freien Gestaltung des Stempel-Layout, 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, although the stamp layout is very limited. Alternatively, there is the possibility of using contactless printing systems, in particular inkjet printers, 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. The use of printing systems with a free design of the stamp layout is particularly attractive if stamps are to be canceled on one side of a consignment and advertising is to be printed on the same side or on the other side. In such a case, the advertising logos can change from shipment to shipment, so that different customer groups can be addressed depending on the destination.
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 Senduπgsförderuπg über paarweise angeordnete Förderbänder erfolgt, zwischen denen die Sendungen reibschlüssig mitgezogen werden, besteht das Problem, daß eine Differenzgeschwindigkeit zwischen den Förderbändern und den Sendungen entsteht.In order to achieve high print quality, it is necessary with ink jet printers that the mail items are at a predetermined distance, e.g. of 0.5 mm as quietly as possible past the printheads. It is important that the mail items are conveyed at a predetermined speed synchronized with the control of the print heads. In particular, when the transmission is carried out via conveyor belts arranged in pairs, between which the shipments are frictionally drawn, there is the problem that a differential speed arises between the conveyor belts and the shipments.
Eine solche Differeπzgeschwindigkeit 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.Such a speed of difference has a particularly disadvantageous effect if a uniform marking is to be applied to the mailpieces by means of various print heads which are arranged one behind the other and which print at different times.
ORIGINAL UNTERLAGEN Aufgabe der vorliegenden Erfindung ist es daher, eine Vorπchtung und ein Verfahren anzugeben, mit dem eine sichere und ruhige Förderung der Sendungen mit vorgegebenem Abstand von den Druckköpfeπ erreicht wird.ORIGINAL DOCUMENTS The object of the present invention is therefore to provide a device and a method with which a safe and quiet conveyance of the mail items with a predetermined distance from the print heads is achieved.
Diese Aufgabe wird erήπduπgsgemäß durch die Merkmale der Patentansprüche 1 und 11 gelöst Vorteilhafte Ausführungen der Erfindung sind den Unteraπsprüchen sowie der Beschreibung und den Zeichnungen zu entnehmen.This object is achieved according to the features of claims 1 and 11. Advantageous embodiments of the invention can be found in the subclaims and in the description and the drawings.
Die zur Erläuterung der Erfindung verwendeten Zeichnungen zeigen in:The drawings used to explain the invention show in:
Fig. 1 ein Beispiel eines zeitlich korrekt ausgeführten und eines nicht koσekt ausgeführten Druckes durch zwei zeitlich versetzt druckende Druckköpfe;1 shows an example of a time correctly executed and a non-coctively executed print by two time-delayed printing heads;
Fig. 2 eine Obenansicht einer eπϊπduπgsgemäßen Vorrich¬ tung;2 shows a top view of a device according to the invention;
Fig. 3 eine Seitenansicht einer erππdungsgemäßeπ Vorπch¬ tung;3 shows a side view of a device according to the invention;
Fig. 4 eine Detaildarstellung der Öffnungszeit bei einer dicken Sendung undFig. 4 is a detailed representation of the opening time for a thick program and
Fig. 5 eine Ausführungsform einer Saugdruckeiπstellvor- richtung zur Koπstanthaituπg der Normalkraft auf die Sendung.5 shows an embodiment of a suction pressure adjusting device for constant normal force on the mailpiece.
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. Die Figuren 2 und 3 zeigen eine bevorzugte Ausführungsform einer erfindungsgemäßen Vorrichtung in Oben- bzw. Seitenansicht. Hierbei ist eine Kulisse 1 so angeordnet, daß die zwischen dem paarweise angeordneten Deckband 2 und gelochtem Transportband 4 geförderte Sendung 3 in einem vorgegebenen Abstand an den Druckköpfen 8 vorbeigeführt wird. Die Druckstation 8a weist neben den in diesem Ausführungsbeispiel dargestellten zwei Druckköpfeπ 8 noch Tintenbehälter 7 sowie ein Tinteπzuführsystem und eine Reinigungspumpe auf, die jedoch im folgenden nicht genauer dargestellt werden. Die Druckstationeπ werden von einem Eiektronikmagazin gesteuert. Vorzugsweise werden zwei Druckstatioπen eingesetzt, wobei jede Station eine Seite einer Sendung bedrud-t Zur Steuerung des Druckbegiπns wird eine Lichtschranke 10 eingesetzt Eine einlaufende Sendung löst über diese Lichtschranke das Signal zum Drucken aus. Dabei beginnt zuerst der erste Druckkopf zu drucken. Zeitlich versetzt beginnt der zweite Druckkopf zu drucken. Die Druckbeginne mü.sseπ 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 Entfemung der Lichtschranke 10 zum ersten Druckkopf bzw. zum zweiten Druckkopf in eine Anzahl von Takten umgesetzt. Der Beginn des Dru-ckens setzt ein, wenn die entsprechende Anzahl Takte erreicht ist. dies entspricht wiederum einem bestimmten Weg. Der Druckvorgaπg selbst wird direkt durch den Taktgeber gesteuert. Da die Steuerung des Drückens wegabhängig erfolgt, ist es unerhebiich, welche Geschwindigkeit die Sendungen haben. Vorzugsweise sind die Druckköpfe als Tintenstrahldrucker ausgeführt Dabei sitzt in den Druckköpfen eine Pixelplatte, in der Düsen 11 so angeordnet sind, daß eine vorgegebene Anzahl von diesen jeweils einen Pixel auf der Druckvortage erzeugen.Fig. 1 shows the differences between correctly timed and incorrectly executed prints by two staggered printing heads. The latter shows an offset of the two printed images against each other. If the printheads are otherwise controlled correctly, such a displacement occurs if there is slippage between the consignment and the conveyor belts used for transport. Figures 2 and 3 show a preferred embodiment of a device according to the invention in top and side views. Here, a backdrop 1 is arranged so that the mailing 3 conveyed between the cover belt 2 arranged in pairs and the perforated conveyor belt 4 is guided past the print heads 8 at a predetermined distance. In addition to the two print heads 8 shown in this exemplary embodiment, the printing station 8a also has ink containers 7 and an ink supply system and a cleaning pump, which are not shown in the following. The Druckstationeπ are controlled by an electronic magazine. Preferably, two printing stations are used, each station requiring one side of a shipment. A light barrier 10 is used to control the start of printing. An incoming shipment triggers the signal for printing via this light barrier. The first printhead starts to print. The second print head starts printing at different times. The start of printing must be coordinated so that a uniform image is generated. The control of the printing process is preferably synchronized with a clock generator, which is driven by the conveyor belt 4. The distance from the light barrier 10 to the first print head or to the second print head is converted into a number of cycles. Printing begins when the corresponding number of bars has been reached. this in turn corresponds to a certain way. The Druckvorgaπg itself is controlled directly by the clock. Since the control of the push is carried out depending on the path, it is irrelevant what speed the items are. The print heads are preferably designed as inkjet printers. A pixel plate is located in the print heads, in which nozzles 11 are arranged so that a predetermined number of these each produce a pixel on the previous day of printing.
Bevorzugt wird eine lineare Anordnung von Düsen verwendet, obwohl auch Matrix- oder andere Anordnungen möglich sind. Für den Druck eines einheitlichen Bilds durch zwei Druckköpfe werden diese räumlich entsprechend senkrecht versetzt und unter einem vorgegebenen Winkel α angeordnet. Der Abstand von der Lichtschranke 10 zu den jeweiligen ersten Düsen des jeweiligen Druckkopfes wird einem elektronischen Rechner als Delay angegeben. Der Rechner wandelt die Strecke in Takte um. Durch eine Änderung des Deiays kann der Druckbeginn der Köpfe jeweils justiert werden.A linear arrangement of nozzles is preferably used, although matrix or other arrangements are also possible. For the printing of a uniform image by two print heads, these are spatially offset vertically and arranged at a predetermined angle α. The distance from the light barrier 10 to the respective first nozzles of the respective print head is given to an electronic computer as a delay. The computer converts the route into bars. The start of printing of the heads can be adjusted by changing the deiays.
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 run over 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 den Figuren 2 und 3, dem Deckband 2 und Transportband 4, besteht eine Brief-Haltekraft, die abhängig ist von dem Reibkoeffizienten μ und der Normalkraft FN. Diese Normalkraft setzt sich ύblicnerweise aus zwei Teilen zusammen, der Normalkraft infolge der Dehnung der Transportbänder FN^ und infolge der Vorspannung der Bänder FN2.Between the conveyor belts, according to FIGS. 2 and 3, the cover belt 2 and the conveyor belt 4, there is a letter holding force which is dependent on the coefficient of friction μ and the normal force FN. This normal force continues ύBlickly from two parts, the normal force due to the stretching of the conveyor belts FN ^ and due to the pretensioning of the belts FN2.
FR = J μ (FN1 + FN2).FR = J μ (FN 1 + FN 2 ).
Der Faktor J beschreibt die Anzahl der Reibfiächeπpaare, J = 2. Die Größe der Normalkraft wird durch die Aufspreizung der Förderbänder durch den Bπef bestimmt Die Aufspreizung führt zu einer Dennung der Bänder. Vor und hinter der Sendung wird die Aufspreizung der Förderbänder durch die Rollen 12 geschlossen. Zusätzlich ist die Größe der durcn die Aufsoreizung 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 schiupfreiche Senduπgsführung zu gewährieisten.The factor J describes the number of pairs of friction surfaces, J = 2. The size of the normal force is determined by the spreading of the conveyor belts by the belt. The spreading leads to a separation of the bands. In front of and behind the shipment, the spreading of the conveyor belts is closed by the rollers 12. In addition, the size of the normal force due to the excitation is determined by the distance between these two rollers. Since the device for printing is arranged between the rollers 12, the distance between the rollers is not large enough to guarantee a smooth transmission.
Figuren 2 und 3 zeigen eine im wesentlichen im Bereich der Drucköpfe angeordnete Saugwanne 5. Vorzug.sweιse erstreckt sich diese Saugwanne linear bis in den Bereich der Rollen 12 beidseitig zur Druckstation 6, die zwischen den Rollen 12 angeordnet istFIGS. 2 and 3 show a suction trough 5 arranged essentially in the region of the pressure heads. This suction trough extends linearly up to the region of the rollers 12 on both sides of the printing station 6, which is arranged between the rollers 12
Die Saugwaπne 5 weist eine Öffnung auf, die den Förderbändern, dem Deckband 2 und dem gelochten Transportband 4 angepaßt ist, so daß die Sendungen von dem Unterdrück gegen das Transportband 4 gedrückt werden. Dies wird dadurch ermöglicht daß das Transportband 4 an der Kulisse anliegt, die über die Saugwanπe läuft Vorzugsweise ist die Öffnung als Lochblech ausgeführt.The Saugwaπne 5 has an opening which is adapted to the conveyor belts, the cover belt 2 and the perforated conveyor belt 4, so that the mail items are pressed against the conveyor belt 4 by the oppression. This is made possible by the fact that the conveyor belt 4 lies against the backdrop that runs over the suction wall. The opening is preferably designed as a perforated plate.
Um eine möglichst lange Führung der Sendung zu gewährleisten, erstreckt sich die Saugwanne länger als die Kulisse. Vorzugsweise ist die Öffnung der Unterdruckvorrichtung, d. h. im wesentlichen der Saugwanne, derartig an Deckband und Transportband angepaßt daß Sendungen zwar von dem Unterdruck gegen das gelochte Band gedrückt werden, daß jedoch, wenn keine Sendung vor der Unterdruckeinπchtung steht, ein Verschluß der Löcher des gelochten Transportbandes erfolgt Durch die Uπterdruckvorrichtuπg wird eine Erhöhung der Normalkraft auf dieIn order to ensure that the shipment runs as long as possible, the suction pan extends longer than the backdrop. Preferably, the opening of the vacuum device, ie essentially the suction trough, is adapted to the cover belt and conveyor belt in such a way that mail items are pressed against the perforated belt by the vacuum, but that, if no shipment is in front of the vacuum device, the holes in the perforated conveyor belt are closed he follows The Uπterdruckvorrichtuπg is an increase in the normal force on the
Sendungen erreicht da die Sendungen durch das über die Kulisse laufendeConsignments reached because the consignments are going through the backdrop
Transportband angesaugt werden.Conveyor belt are sucked.
Die Treibkraft wird daher zuThe driving force is therefore too
FR = j - μ - (FN1 + FN2 Fs), wobei FS die durch die Uπterdruckeiπrichtung erzeugte Normalkraft bezeichnet Die Größe der zusätzlichen Normalkraft liegt mindestens um einenF R = j - μ - (F N1 + F N2 F s ), where FS denotes the normal force generated by the negative pressure device. The size of the additional normal force is at least one
Faktor 10 höher als je durch die Förderbänder allein erreichten Kräfte.Factor 10 higher than ever achieved by the conveyor belts alone.
In Fig. 4 ist eine Situation gezeigt bei der zwischen dem gelochten Transportband hier und dem Deckbaπd 2 eine dickere Sendung beigeklemmt ist. Bei ordnungsgemäßem Betrieb wird die Öffnung der Saugwanne durch die Sendung und das Deckband 2 geschlossen. Ist jedoch eine dicke Sendung zwischen die Förderbänder geklemmt kann vor und hinter der Sendung ein Öffnungskeii 18 entstehen. In diesem Fall kann das Deckband 2 den Keil 18 nicht schließen, wodurch Löcher des Transportbandes F4 nicht abgedeckt werden. Dadurch entsteht eine Leckage die zum Absenken des Drucks führt.4 shows a situation in which a thicker consignment is clamped between the perforated conveyor belt here and the cover tape 2. When operating correctly, the opening of the suction pan is closed by the mail and the cover tape 2. However, if a thick consignment is clamped between the conveyor belts, an opening key 18 can arise in front of and behind the consignment. In this case, the cover belt 2 cannot close the wedge 18, as a result of which holes in the conveyor belt F 4 are not covered. This creates a leak that leads to a drop in pressure.
Fig. 5 zeigt schematisch eine Saugdruckeiπstellvorrichtung zum Anschluß an die Saugkammer. An der Pumpe 20 wird ein Unterdruck erzeugt der durch das Unterdruckventil 21 konstant gehalten wird. Ist ein bestimmter Unterdruck erreicht, so öffnet das Unterdruckveπtii 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 Druci schwankungen vorhanden.Fig. 5 shows schematically a Saugdruckeiπstellvorrichtung for connection to the suction chamber. A vacuum is generated at the pump 20 and is kept constant by the vacuum valve 21. If a certain negative pressure is reached, the negative pressure valve opens and air is sucked in via a bypass 22. The vacuum remains constant. If the pressure collapses due to leakage, the bypass 22 is closed. Since a large volume flow is conveyed, there are only slight pressure fluctuations.
Um eine einheitlich gute Druckqualität zu erreichen, ist zusätzlich zu den bereits erwähnten Förderbändern ein Ruπdriemen 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 Druckköpfeπ 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. In order to achieve a uniformly good print quality, a belt 9 is provided in addition to the conveyor belts already mentioned, in order to additionally press the mail items against the backdrop 1 in the lower part. This is particularly useful if, as can be seen in FIG. 3, the conveyor belts 2 and 4 lie over the print heads. The round belt 9 achieves additional calming of the shipment and higher print quality. The round belt 9 is preferably coupled to the conveyor belt 4.

Claims

Patentansprüche claims
1. Vomchtung zum Drucken von Markierungen auf flachen Sendungen mit einer oder mehreren Druckstationeπ, die jeweils mindestens einen Druckkopf aufweisen und bei der die Sendungen einzeln mittels einer Fördereinπchtuπg an αen Druckstationeπ vorbeigeführt werden, wobei e Sendungen an einer Kulisse anliegen, dadurch gekennzeichnet daß im Bereich der Dru-ckstation eine Unterαruckvorπcntung angeordnet ist, durch die mittels Unterdruck eine Normalkraft auf die Sendungen im wesentlichen senkrecht zur Förderπchtung der Sendungen in Richtung auf die Druckstationen ausgeübt wird.1. Device for printing markings on flat mail items with one or more printing stations, each of which has at least one print head and in which the mail items are individually guided past a printing station by means of a conveying device, e items lying against a backdrop, characterized in that in the area a vacuum device is arranged in the printing station, by means of which a normal force is exerted on the mail items by means of vacuum, essentially perpendicular to the delivery of the mail items in the direction of the printing stations.
2. Vomchtung nach Anspruch 1 , dadurch gekennzeichnet daß im Bereich jeder Druckstation die Kulisse derart angeordnet ist, daß die jeweils zu bedruckende Oberfläche der Seπcungeπ einen vorgegebenen Abstand von den Druckkόpfen hat.2. arrangement according to claim 1, characterized in that in the area of each printing station the backdrop is arranged such that the surface to be printed in each case of the Seπcungeπ has a predetermined distance from the printing heads.
3. Vomchtung nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet daß die Förderemπchtung aus einem Deckband und einem äußeren Transporband besteht die paarweise angeordnet sind und zwischen denen die Sendungen reibschlüssig mitgezogen werden.3. Vomchtung according to claim 1 or claim 2, characterized in that the Förderemπchtung consists of a shroud and an outer conveyor belt which are arranged in pairs and between which the consignments are frictionally drawn.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet daß das Transportband Löcher aufweist und die Unterdruckvorrichtuπg eine an Deckband und Transportband angepaßte Öffnung aufweist. derart, daß die Sendungen von dem Unterdruck gegen das Transportband gedrückt werden und daß ein Verschluß der Löcher des gelochten Transportbandes erfolgt, wenn keine Sendung vor der Unterdruckeiπrichtuπg steht.4. The device according to claim 3, characterized in that the conveyor belt has holes and the Unterdruckvorrichtuπg has an adapted to the shroud and conveyor belt opening. in such a way that the mail items are pressed against the conveyor belt by the vacuum and that the holes in the perforated conveyor belt are closed when no mail item is in front of the vacuum device.
5 Vorrichtung nach Anspruch 4, dadurch gekennzeicnnet. daß eine Saugdruckeiπstellvorrichtung vorgesehen ist, um die Normalkraft konstant zu halten.5 Device according to claim 4, characterized gekennzeicnnet. that a Saugdruckeiπstellvorrichtung is provided to keep the normal force constant.
6. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet daß als Druckköpfe Tintenstrahldrucker vorgesehen sind.6. Device according to one of the preceding claims, characterized in that ink jet printers are provided as print heads.
7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet daß die Druckköpre jeweils unter einem vorgegebenen Winkel α gegenüber der Horizontalen angeordnet sind.7. The device according to claim 6, characterized in that the pressure heads are each arranged at a predetermined angle α relative to the horizontal.
8. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet daß jede Druckstation mindestens zwei Druckköpfe aufweist, die jeweils zeitlich versetzt drucken.8. Device according to one of the preceding claims, characterized in that each printing station has at least two print heads, each printing at different times.
9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet daß die Druckköpfe derart zeitlich versetzt drucken, daß eine einheitliche Markierung gedruckt wird.9. The device according to claim 8, characterized in that the print heads print in such a time offset that a uniform marking is printed.
10. Druckvorrichtuπg zum Drucken von Markierungen auf flachen Sendungen, dadurch gekennzeichnet daß mindestens zwei Vorrichtungen nach einem der Ansprüche 1 bis 9 vorgesehen sind und daß mindestens eine dieser Vorrichtungen für das Bedrucken jeweils einer Seite der Sendungen vorgesehen ist.10. Druckvorrichtuπg for printing markings on flat mail items, characterized in that at least two devices are provided according to one of claims 1 to 9 and that at least one of these devices is provided for printing on one side of the mail items.
11. Verfahren zum Drucken von Markierungen auf flachen Sendungen mit einer oder mehreren Druckstatioπen, bei der die Sendungen einzeln an den Druckstationen vorbeigefördert werden, dadurch gekennzeichnet. daß im Bereich der Druckstationeπ durch Unterdruck eine Normalkraft auf die Sendungen im wesentlichen senkrecht zur Fördereinrichtung der Sendungen in Richtung auf die Druckstatiαπ ausgeübt wird. 11. A method for printing markings on flat mail items with one or more printing stations, in which the mail items are conveyed individually past the printing stations, characterized. that in the area of the Druckstationeπ a normal force is exerted on the mail items essentially perpendicular to the conveying device of the mail items in the direction of the Druckstatiαπ.
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
DE19508180A DE19508180C2 (en) 1995-03-09 1995-03-09 Device for printing markings on flat mail items with suction belt transport
DE19508180 1995-03-09
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 true EP0759003A1 (en) 1997-02-26
EP0759003B1 EP0759003B1 (en) 1999-06-02

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EP96911943A Expired - Lifetime EP0759003B1 (en) 1995-03-09 1996-03-07 Method and device for printing markings on flat consignments

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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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DE10146842B4 (en) * 2001-09-24 2006-11-09 Deutsche Post Ag Method and device for printing on postal items
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Also Published As

Publication number Publication date
US5883643A (en) 1999-03-16
DE19508180A1 (en) 1996-09-12
DE59602059D1 (en) 1999-07-08
JPH10500384A (en) 1998-01-13
EP0759003B1 (en) 1999-06-02
JP3775511B2 (en) 2006-05-17
WO1996028374A1 (en) 1996-09-19
DE19508180C2 (en) 1998-10-01

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