EP0616572B1 - Process for feeding a sheet into a processing unit - Google Patents

Process for feeding a sheet into a processing unit Download PDF

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Publication number
EP0616572B1
EP0616572B1 EP92924566A EP92924566A EP0616572B1 EP 0616572 B1 EP0616572 B1 EP 0616572B1 EP 92924566 A EP92924566 A EP 92924566A EP 92924566 A EP92924566 A EP 92924566A EP 0616572 B1 EP0616572 B1 EP 0616572B1
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EP
European Patent Office
Prior art keywords
document
printing
edge
transporting
brushing
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
EP92924566A
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German (de)
French (fr)
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EP0616572A1 (en
Inventor
Ruprecht Flügge
Wolfgang Neef
Bruno Wendland
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Wincor Nixdorf International GmbH
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Wincor Nixdorf International GmbH
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Publication of EP0616572A1 publication Critical patent/EP0616572A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J13/00Devices 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
    • B41J13/10Sheet holders, retainers, movable guides, or stationary guides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00Devices 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
    • B41J11/0045Guides for printing material
    • B41J11/005Guides in the printing zone, e.g. guides for preventing contact of conveyed sheets with printhead

Definitions

  • the invention relates to a method for securely guiding a record carrier in a document processing device.
  • a method for feeding single-sheet paper in a printer is already known from DE 38 37 566 A1.
  • a paper guide extends on both sides of the print head mouthpiece and can be moved back and forth together with the print head parallel to the platen roller.
  • the single sheet to be printed is first drawn into the printer with the print head out of the printing position until its front edge has just passed the printing station.
  • the print head is then moved to the center of the print area so that the paper guide presses the paper onto the print roller. Only then is the paper brought to the line position to be printed.
  • Receipts can also be deformed during the printing process itself. This happens especially with dot matrix printers, which print receipts in an unfavorable paper fiber direction and which - supported by a low hardness of the printing bar and when the printing needles hit hard - causes the receipt to curve or bulge due to the printing process.
  • the invention has for its object to improve the document management process in generic printing or writing devices so that even non-flat documents are properly managed.
  • a printing carriage 12 on a straight line parallel to one arranged in front of it and integrated in a support table 48 pressure abutment (pressure bar) 16 movable.
  • the printing carriage 12 is mounted on a parallel guide in a known manner and is therefore not described in detail.
  • the print carriage 12 carries an ink ribbon cassette 18, a needle print head 14 and optical recognition elements 20, 22.
  • An essential component of the recognition elements 20, 22 are light-emitting diodes (not shown in the figure) which send light in the direction of the print bar.
  • Photo elements in the detection elements 20, 22 measure the light reflection from the direction of the pressure bar.
  • the dark pressure bar 16 reflects little light, whereas a document 50 reflects a lot of light, so that the position of the edges of the document in the printing line direction can be detected with the detection elements 20, 22.
  • the printing carriage On both sides in the direction of travel of the printing carriage 12, the printing carriage carries a document guiding device 30, 32 aligned parallel to the pressure beam 16. Fastening elements 34, 35 for the document guiding devices on the printing carriage 12 are indicated by dashed lines. A document 50 can be seen on the pressure bar 16, which is prevented from arching up by the document guiding devices 30, 32 in the area of the printing line.
  • a narrow gap 19 is left between the two document guiding devices 30, 32 for the passage of the mouthpiece of the needle print head 14.
  • FIG. 2 shows the essential parts of the printing or writing device in a section transverse to the line direction, that is to say along the transport directions A, B of the documents 50 to be printed.
  • a guide plate 52 is arranged at a small distance and parallel to the support table 48, which is bent upwards at its end near the print head and ends in an edge 54.
  • the baffle 52 thus forms a feed chute 56 which widens in a funnel shape near the print head.
  • a second guide plate 58 which is arranged parallel and at a short distance from the support table 48, forms a discharge shaft 60 with the support table 48.
  • the guide plate 58 is likewise bent upward at its end near the print head 14 and ends in an edge 62.
  • a light barrier 64 is installed in the feed shaft 56 and a light barrier 66 is installed in the discharge shaft 60.
  • the light barriers 64, 66 serve to recognize the front and rear edges of the document 50.
  • the last line of a receipt is printed in a position in which the receipt is the furthest into the printer.
  • the document is issued in the direction of arrow B against the feed direction by reversing the transport direction of the transport devices. In the furthest retracted position, the document is no longer held down by the guide plate 52, as is shown in FIG. 2 for a document 50a indicated by dashed lines.
  • the document trailing edge is located outside the feed chute 56.
  • the process according to the invention involves movements which lead to non-planar and arched documents covering the entire length of their front edge by sweeping movements of the document guiding devices 30, 32 attached to the printing carriage 12 are forced into the feed shaft 56.
  • the document is only advanced in the output direction B until it is introduced into the funnel-shaped initial part of the feed chute by a small amount d.
  • a path d of approximately 2 mm has proven to be favorable as the penetration depth.
  • FIG. 2 shows documents with different degrees of deformation.
  • a flat document 50b will run into the feed chute 56 without bumping.
  • a strongly arched receipt as this difference is not known to the printer control, is pushed and stopped just as much as a flat receipt. and lies on the curved edge 54 of the guide plate 52 due to its curvature or even bends away from this edge in the direction of the print head.
  • the print head 14 is moved in the line direction.
  • the document guiding devices 30, 32 bend the document edge so far down that it jumps under the edge 54 of the guide plate 52 and, even after the document guiding devices 30, 32 have passed, can at most bulge into the position shown at 50d, in which the document is still safely guided by the guide plate 52 into the feed shaft 56.
  • the transport device is switched on again and conveys the document securely in the feed shaft 56 in direction B.
  • the movement of the printing carriage 12 is controlled in such a way that, starting from the last printing position, it is moved in a first sweeping movement in the direction of a document side edge.
  • the document guiding devices 30, 32 on the printing carriage print the document in the direction of the pressure bar 16.
  • special document guiding devices if the printing carriage and the ribbon guides take over the function of the document guiding devices 30, 32.
  • the printing carriage 12 is moved one after the other in the direction of the two document side edges.
  • the rear edge of the document which stands up due to deformation in the ejection direction, is pressed over its entire length into the feed chute 56 and, in the further ejection movement, is securely gripped by the guide plate 52 of the feed chute 56 over the entire length of the rear edge.
  • the document can be transported without kinking during the final ejection movement.
  • an additional sweeping movement of the printing carriage takes place before the document transport in the direction of the feed shaft 56.
  • the movement of the printing carriage is controlled in the first sweeping movement in such a way that it is moved from the last printing position beyond the first side edge of the document to its end position in the printing line.
  • the print carriage is again moved beyond the second edge of the document to its end position.
  • the two sweeping movements mean that the deformation in Ejection direction B, the upstanding document edge is pressed over its entire length into the feed shaft 56 and, in the further ejection movement, is securely gripped by the guide plate 52 over the entire length of the rear edge.
  • the signals from the optical recognition elements 20, 22 on the print carriage 12, which recognize the side edges of the document are used.
  • the signals of the document side edge detection 20, 22 are used to control the sweeping movement. Both sweep movements then only run until the side edge is recognized. The carriage stops in this position and reverses.
  • the drives for document transport are usually designed with stepper motors. These stepper motors are controlled in the smallest possible steps for the transport steps according to the invention in the feed and discharge directions. For example, a step size of 1/180 inch would be controllable compared to a normal step size of 1/6 inch.
  • the first sweeping movement of the print carriage preferably takes place in the direction of the document side edge further away from the current print head position.
  • the position of the document side edges is detected by further optical recognition devices, not shown, which are integrated in the transport device.
  • the position of the last printing position is taken from the electronic control of the printing process. From this, the two routes to the edges of the document are calculated electronically and the longer route is the first to be controlled.
  • the print head can remain in the end position of the last scanning movement. At least with wide documents, the print carriage is moved to the center of the document with an additional movement.
  • the method according to the invention cannot only be used when ejecting a receipt. Receipts with a curved leading edge can be reliably guided under the guide plate 58 and thus into the discharge shaft 60 when they are drawn into the printing station.

Abstract

The invention relates to a process for feeding a sheet (50) into a processing unit, especially a printer with a sheet-feed channel (56, 60). In order to guide the leading edge of even bowed or creased sheets (50c) properly into the feed channel (56, 60), the sheet (50) is advanced towards the feed channel until a flat sheet (50a) projects into it to a certain extent (d) and a creased or bowed sheet (50d) can rest with its front edge against the edge of the channel (54, 56). Subsequent passes by conveying devices (30, 32) fitted on the printing slide (12) force the sheet (50d) behind the channel edge (54, 56).

Description

Die Erfindung betrifft ein Verfahren zum sicheren Führen eines Aufzeichnungsträgers in einer Belegbearbeitungseinrichtung.The invention relates to a method for securely guiding a record carrier in a document processing device.

Ein Verfahren zum Einziehen von Einzelblattpapier bei einem Drucker ist bereits aus der DE 38 37 566 A1 bekannt. Zu beiden Seiten des Druckkopf-Mundstücks erstreckt sich bei dem vorbekannten Drucker eine Papierführung, die zusammen mit dem Druckkopf parallel zur Schreibwalze hin und her beweglich ist. Zum Einziehen wird das zu bedruckende Einzelblatt bei außerhalb der Druckposition stehendem Druckkopf zunächst so weit in den Drucker eingezogen, bis seine Vorderkante gerade die Druckstation passiert hat. Dann wird der Druckkopf in die Mitte des Druckbereichs verfahren, so daß die Papierführung das Papier an die Druckwalze anpreßt. Erst danach wird das Papier an die zu bedruckende Zeilenposition gebracht.A method for feeding single-sheet paper in a printer is already known from DE 38 37 566 A1. In the previously known printer, a paper guide extends on both sides of the print head mouthpiece and can be moved back and forth together with the print head parallel to the platen roller. To pull in, the single sheet to be printed is first drawn into the printer with the print head out of the printing position until its front edge has just passed the printing station. The print head is then moved to the center of the print area so that the paper guide presses the paper onto the print roller. Only then is the paper brought to the line position to be printed.

Bei der aus der DE 38 37 566 A1 bekannten Druckstation wird das Papier um eine Schreibwalze herumgeführt, bei der das normalerweise plane Papier durch die Papierführung in eine Bogenform gezwungen wird. Wichtig ist dabei nur, daß das Papier im Bereich der Schreibzeile dicht an der Schreibwalze gehalten wird. Nach Verlassen dieser Position nimmt das Papier seine plane Form wieder an. Dies ist von Nachteil, wenn das Papier nach Verlassen der Druckstation mit seiner Vorderkante in einen Papierschacht geleitet werden soll, bzw. nach dem Bedrucken - ggf. auch der unterstmöglichen Zeile - mit seiner Hinterkante voran wieder zurück in den Zuführschacht befördert werden soll. Gerade dies ist aber bei Beleg- oder Sparbuchdruckern der Fall, die häufig als Flachbettdrucker ausgeführt sind. Ein Flachbettdrucker für die Verarbeitung von Belegabschnitten ist aus den Patent Abstracts of Japan, Band 7, Nr. 271, M-260, abstract of JP, A, 58-151278 bekannt.In the printing station known from DE 38 37 566 A1, the paper is guided around a platen roller, in which the normally flat paper is forced into an arc shape by the paper guide. It is only important that the paper is held close to the platen in the area of the writing line. After leaving this position, the paper returns to its flat shape. This is disadvantageous if, after leaving the printing station, the front edge of the paper is to be fed into a paper chute, or after printing - possibly also the lowest possible line - the trailing edge is to be conveyed back into the feed chute first. But this is precisely the case with receipt or passbook printers, which are often designed as flatbed printers. A flatbed printer for processing slip sections is known from Patent Abstracts of Japan, Volume 7, No. 271, M-260, abstract of JP, A, 58-151278.

Bei diesen Druckern tritt das Problem auf, daß nichtebene Belege nicht einwandfrei transportiert und ausgeworfen werden. Das Problem entsteht dadurch, daß der Beleg in der weitest eingezogenen Lage mit seiner in Auswurfrichtung vorderen Kante nicht mehr im Auswurfschacht liegt und die dort vorhandenen Leit- oder Niederhalteelemente die Lage des Belegs nicht mehr beeinflussen. Diese Vorderkante eines nach oben gewölbten Belegs stößt gegen Elemente des Auswurfschachts, wodurch mit der Auswurfbewegung Knickungen (Eselsohren) des Belegs verursacht werden. Es kann auch vorkommen, daß der geknickte Beleg im Auswurfschacht hängenbleibt und zerrissen wird. Außerhalb der Belegbearbeitung entstehen Verformungen des Belegs zum Beispiel durch unsachgemäße Lagerung von kleinen Belegformaten in senkrechter Stellung. Die Nachteile, die bei diesen Druckern auftreten, sind für den Benutzer störend.The problem with these printers is that non-flat documents are not transported and ejected properly. The problem arises from the fact that the document in the most retracted position with its front edge in the ejection direction no longer lies in the discharge chute and the guiding or holding-down elements there no longer influence the position of the document. This leading edge of a document that is arched upward abuts elements of the discharge chute, which causes the document to be bent (dog-eared) during the ejection movement. It can also happen that the folded document gets caught in the discharge chute and is torn. Outside of document processing, the document is deformed, for example, due to improper storage of small document formats in a vertical position. The disadvantages that occur with these printers are annoying to the user.

Häufig ist er auch gezwungen, Eingriffe in das Gerät vorzunehmen, um hängengebliebene Belege zu entfernen.He is also often forced to intervene in the device to remove stuck receipts.

Belege können auch beim Druckvorgang selbst verformt werden. Dies passiert insbesondere bei Nadeldruckern, die Belege in ungünstiger Papierfaserrichtung bedrucken und wodurch - unterstützt durch eine geringe Härte des Druckbalkens und bei starkem Aufschlag der Drucknadeln - eine Krümmung oder Aufwölbung des Belegs durch den Druckvorgang erfolgt.Receipts can also be deformed during the printing process itself. This happens especially with dot matrix printers, which print receipts in an unfavorable paper fiber direction and which - supported by a low hardness of the printing bar and when the printing needles hit hard - causes the receipt to curve or bulge due to the printing process.

Der Erfindung liegt die Aufgabe zugrunde, den Belegführungsvorgang in gattungsgemäßen Druck- oder Schreibgeräten so zu verbessern, daß auch nichtebene Belege einwandfrei geführt werden.The invention has for its object to improve the document management process in generic printing or writing devices so that even non-flat documents are properly managed.

Die Aufgabe wird durch die Merkmale des Hauptanspruchs gelöst. Vorteilhafte Weiterbildungen finden sich in den Unteransprüchen.The object is solved by the features of the main claim. Advantageous further developments can be found in the subclaims.

Im folgenden wird die Erfindung an Hand der Zeichnung eines Ausführungsbeispiels beschrieben.The invention is described below with reference to the drawing of an exemplary embodiment.

Es zeigt:

Fig. 1
einen Schnitt durch ein Druck- oder Schreibgerät parallel zur Druckzeilenrichtung, bei dem das erfindungsgemäße Verfahren einsetzbar ist.
Fig. 2
einen Schnitt quer zur Druckzeilenrichtung durch das Druck- oder Schreibgerät.
It shows:
Fig. 1
a section through a printing or writing device parallel to the print line direction, in which the inventive method can be used.
Fig. 2
a section transverse to the print line direction by the printing or writing device.

Innerhalb des Gehäuses des Druck- oder Schreibgeräts ist ein Druckschlitten 12 auf einer geraden Linie parallel zu einem davor angeordneten und in einem Auflagetisch 48 integrierten Druckwiderlager (Druckbalken) 16 verfahrbar angeordnet. Die Lagerung des Druckschlittens 12 auf einer Parallelführung erfolgt in bekannter Weise und wird daher nicht näher beschrieben. Der Druckschlitten 12 trägt eine Farbbandkassette 18, einen Nadeldruckkopf 14 und optische Erkennungselemente 20, 22. Wesentlicher Bestandteil der Erkennungselemente 20, 22 sind in der Figur nicht dargestellte Leuchtdioden, die Licht in Richtung auf den Druckbalken senden. Fotoelemente in den Erkennungselementen 20, 22 messen die Lichtreflexion aus der Richtung des Druckbalkens. Der dunkle Druckbalken 16 reflektiert wenig Licht, wohingegen ein Beleg 50 viel Licht reflektiert, so daß mit den Erkennungselementen 20, 22 die Lage der Kanten des Belegs in Druckzeilenrichtung erfaßt werden kann.Within the housing of the printing or writing device is a printing carriage 12 on a straight line parallel to one arranged in front of it and integrated in a support table 48 pressure abutment (pressure bar) 16 movable. The printing carriage 12 is mounted on a parallel guide in a known manner and is therefore not described in detail. The print carriage 12 carries an ink ribbon cassette 18, a needle print head 14 and optical recognition elements 20, 22. An essential component of the recognition elements 20, 22 are light-emitting diodes (not shown in the figure) which send light in the direction of the print bar. Photo elements in the detection elements 20, 22 measure the light reflection from the direction of the pressure bar. The dark pressure bar 16 reflects little light, whereas a document 50 reflects a lot of light, so that the position of the edges of the document in the printing line direction can be detected with the detection elements 20, 22.

An beiden Seiten in Verfahrrichtung des Druckschlittens 12 trägt der Druckschlitten jeweils eine parallel zum Durckbalken 16 ausgerichtete Belegleiteinrichtung 30, 32. Befestigungslemente 34, 35 für die Belegleiteinrichtungen am Druckschlitten 12 sind gestrichelt angedeutet. Auf dem Druckbalken 16 ist ein Beleg 50 zu sehen, welcher von den Belegleiteinrichtungen 30, 32 im Bereich der Druckzeile am Hochwölben gehindert wird.On both sides in the direction of travel of the printing carriage 12, the printing carriage carries a document guiding device 30, 32 aligned parallel to the pressure beam 16. Fastening elements 34, 35 for the document guiding devices on the printing carriage 12 are indicated by dashed lines. A document 50 can be seen on the pressure bar 16, which is prevented from arching up by the document guiding devices 30, 32 in the area of the printing line.

Zwischen beiden Belegleiteinrichtungen 30, 32 ist ein enger Spalt 19 für den Durchtritt des Mundstücks des Nadeldruckkopfs 14 freigelassen.A narrow gap 19 is left between the two document guiding devices 30, 32 for the passage of the mouthpiece of the needle print head 14.

Fig. 2 zeigt die wesentlichen Teile des Druck- oder Schreibgerätes in einem Schnitt quer zur Zeilenrichtung, also entlang der Transportrichtungen A, B der zu bedruckenden Belege 50.2 shows the essential parts of the printing or writing device in a section transverse to the line direction, that is to say along the transport directions A, B of the documents 50 to be printed.

Wie bereits beschrieben, ist der Druckbalken 16 unterhalb des Druckkopfes 14 in den Auflagetisch 48 eingelassen. In Zuführrichtung A vor dem Druckkopf 14 ist in geringem Abstand und parallel zu dem Auflagetisch 48 ein Leitblech 52 angeordnet, das an seinem dem Druckkopf nahen Ende nach oben abgebogen ist und in einer Kante 54 endet. Das Leitblech 52 bildet also einen Zuführschacht 56, der sich nahe dem Druckkopf trichterförmig erweitert.As already described, the pressure bar 16 is let into the support table 48 below the print head 14. In the feed direction A in front of the print head 14, a guide plate 52 is arranged at a small distance and parallel to the support table 48, which is bent upwards at its end near the print head and ends in an edge 54. The baffle 52 thus forms a feed chute 56 which widens in a funnel shape near the print head.

In Zuführrichtung A hinter dem Druckkopf 14 bildet ein zweites, parallel und in geringem Abstand zum Auflagetisch 48 angeordnetes Leitblech 58 mit dem Auflagetisch 48 einen Abförderschacht 60. Das Leitblech 58 ist an seinem dem Druckkopf 14 nahen Ende ebenfalls nach oben abgebogen und endet in einer Kante 62. Im Zuführschacht 56 ist eine Lichtschranke 64 und im Abförderschacht 60 eine Lichtschranke 66 eingebaut. Die Lichtschranken 64, 66 dienen der Erkennung der Vorder- und Hinterkante des Belegs 50.In the feed direction A behind the print head 14, a second guide plate 58, which is arranged parallel and at a short distance from the support table 48, forms a discharge shaft 60 with the support table 48. The guide plate 58 is likewise bent upward at its end near the print head 14 and ends in an edge 62. A light barrier 64 is installed in the feed shaft 56 and a light barrier 66 is installed in the discharge shaft 60. The light barriers 64, 66 serve to recognize the front and rear edges of the document 50.

Die letzte Zeile eines Belegs wird in einer Lage bedruckt, in der der Beleg am weitesten in den Drucker eingezogen ist. Die Belegausgabe erfolgt in Richtung des Pfeils B gegen die Zuführrichtung durch Umkehrung der Transportrichtung der Transporteinrichtungen. In der weitest eingezogenen Position wird der Beleg nicht mehr von dem Leitblech 52 niedergehalten, wie dies in Fig. 2 für einen gestrichelt angedeuteten Beleg 50a gezeigt ist. Die Beleg-Hinterkante befindet sich außerhalb des Zuführschachtes 56.The last line of a receipt is printed in a position in which the receipt is the furthest into the printer. The document is issued in the direction of arrow B against the feed direction by reversing the transport direction of the transport devices. In the furthest retracted position, the document is no longer held down by the guide plate 52, as is shown in FIG. 2 for a document 50a indicated by dashed lines. The document trailing edge is located outside the feed chute 56.

Beim Rückfördern des Belegs in Richtung des Pfeils B laufen bei dem erfindungsgemäßen Verfahren Bewegungsabläufe ab, die dazu führen, daß nichtebene und hochgewölbte Belege auf der gesamten Länge ihrer Vorderkante durch Überstreichbewegungen der am Druckschlitten 12 angebrachten Belegleiteinrichtungen 30, 32 in den Zuführschacht 56 gezwungen werden.When the document is conveyed back in the direction of arrow B, the process according to the invention involves movements which lead to non-planar and arched documents covering the entire length of their front edge by sweeping movements of the document guiding devices 30, 32 attached to the printing carriage 12 are forced into the feed shaft 56.

In einem ersten erfindungsgemäßen Verfahrensschritt wird der Beleg in Ausgaberichtung B nur so weit vorgeschoben, bis er um ein geringes Maß d in das trichterförmige Anfangsteil des Zufürschachts hineingeführt wird. Als Eindringtiefe hat sich ein Weg d von etwa 2 mm als günstig erwiesen.In a first method step according to the invention, the document is only advanced in the output direction B until it is introduced into the funnel-shaped initial part of the feed chute by a small amount d. A path d of approximately 2 mm has proven to be favorable as the penetration depth.

In Fig. 2 sind Belege mit unterschiedlichem Verformungsgrad dargestellt. Ein planer Beleg 50b wird ohne anzustoßen in den Zuführschacht 56 einlaufen. Ein stark gewölbter Beleg wird, da dieser Unterschied der Druckersteuerung nicht bekannt ist, genausoweit wie ein planer Beleg vorgeschoben und angehalten. und legt sich auf Grund seiner Wölbung an die aufgebogene Kante 54 des Leitblechs 52 oder biegt sich sogar noch von dieser Kante weg in Richtung Druckkopf. Nun wird der Druckkopf 14 in Zeilenrichtung verfahren. Die Belegleiteinrichtungen 30, 32 biegen die Belegskante dabei so weit nach unten, daß sie unter die Kante 54 des Leitblechs 52 springt und sich auch nach dem Vorbeifahren der Belegleiteinrichtungen 30, 32 höchstens noch in die bei 50d gezeigte Position aufwölben kann, in der der Beleg noch sicher von dem Leitblech 52 in den Zuführschacht 56 gelenkt wird. Nach den Überstreichbewegungen wird die Transporteinrichtung erneut eingeschaltet und befördert den Beleg sicher in dem Zuführschacht 56 in Richtung B weiter.2 shows documents with different degrees of deformation. A flat document 50b will run into the feed chute 56 without bumping. A strongly arched receipt, as this difference is not known to the printer control, is pushed and stopped just as much as a flat receipt. and lies on the curved edge 54 of the guide plate 52 due to its curvature or even bends away from this edge in the direction of the print head. Now the print head 14 is moved in the line direction. The document guiding devices 30, 32 bend the document edge so far down that it jumps under the edge 54 of the guide plate 52 and, even after the document guiding devices 30, 32 have passed, can at most bulge into the position shown at 50d, in which the document is still safely guided by the guide plate 52 into the feed shaft 56. After the sweeping movements, the transport device is switched on again and conveys the document securely in the feed shaft 56 in direction B.

Im zweiten Verfahrensschritt wird die Bewegung des Druckschlittens 12 so gesteuert, daß er, ausgehend von der letzten Druckposition, in einer ersten Überstreichbewegung in Richtung einer Belegseitenkante gefahren wird. Die Belegleiteinrichtungen 30, 32 am Druckschlitten drucken den Beleg in Richtung Druckbalken 16. Je nach Bauart des Druckschlittens kann sogar auf besondere Belegleiteinrichtungen verzichtet werden, wenn der Druckschlitten und die Farbbandführungen die Funktion der Belegleiteinrichtungen 30, 32 übernehmen.In the second process step, the movement of the printing carriage 12 is controlled in such a way that, starting from the last printing position, it is moved in a first sweeping movement in the direction of a document side edge. The document guiding devices 30, 32 on the printing carriage print the document in the direction of the pressure bar 16. Depending on the type of Printing slides can even be dispensed with special document guiding devices if the printing carriage and the ribbon guides take over the function of the document guiding devices 30, 32.

In weiteren Verfahrensschritten wird der Druckschlitten 12 nacheinander in Richtung der beiden Belegseitenkanten gefahren. Durch beide Überstreichbewegungen wird die durch Verformung in Auswurfrichtung hochstehende Beleghinterkante auf ihrer gesamten Länge in den Zuführschacht 56 gedrückt und in der weiteren Auswurfbewegung sicher auf der gesamten Länge der Hinterkante von dem Leitblech 52 des Zuführschachtes 56 erfaßt. Der Beleg wird bei der endgültigen Auswurfbewegung ohne Knicken transportierbar.In further process steps, the printing carriage 12 is moved one after the other in the direction of the two document side edges. By means of both sweeping movements, the rear edge of the document, which stands up due to deformation in the ejection direction, is pressed over its entire length into the feed chute 56 and, in the further ejection movement, is securely gripped by the guide plate 52 of the feed chute 56 over the entire length of the rear edge. The document can be transported without kinking during the final ejection movement.

In einer vorteilhaften Weiterbildung des Verfahrens erfolgt vor dem Belegtransport in Richtung Zuführschacht 56 eine zusätzliche Überstreichbewegung des Druckschlittens.In an advantageous development of the method, an additional sweeping movement of the printing carriage takes place before the document transport in the direction of the feed shaft 56.

Erst danach schiebt die Transporteinrichtung den Beleg in Ausgaberichtung B vor, bis die Belegkante um ein Geringes in den trichterförmigen Teil des Zuführschachts 56 hinein vorgefahren ist. Die zuvor genannte Überstreichbewegung schließt sich an.Only then does the transport device advance the document in the output direction B until the edge of the document is slightly advanced into the funnel-shaped part of the feed chute 56. The aforementioned sweeping movement follows.

In Fortbildung des geschilderten Verfahrensablaufs wird in der ersten Überstreichbewegung die Bewegung des Druckschlittens so gesteuert, daß er ausgehend von der letzten Druckposition über den ersten Seitenrand des Belegs hinaus bis zu seiner Endlage in der Druckzeile gefahren wird. In der zweiten Überstreichbewegung wird der Druckschlitten über die zweite Belegseitenkante hinaus wieder bis zu seiner Endlage gefahren. Wie bereits beschrieben wird durch die beiden Überstreichbewegungen die durch Verformung in Auswurfrichtung B hochstehende Belegkante auf ihrer gesamten Länge in den Zuführschacht 56 gedrückt und in der weiteren Auswurfbewegung sicher auf der gesamten Länge der Hinterkante von dem Leitblech 52 erfaßt.In a development of the process sequence described, the movement of the printing carriage is controlled in the first sweeping movement in such a way that it is moved from the last printing position beyond the first side edge of the document to its end position in the printing line. In the second sweeping movement, the print carriage is again moved beyond the second edge of the document to its end position. As already described, the two sweeping movements mean that the deformation in Ejection direction B, the upstanding document edge is pressed over its entire length into the feed shaft 56 and, in the further ejection movement, is securely gripped by the guide plate 52 over the entire length of the rear edge.

In einer anderen Ausgestaltung dieses Verfahrensablaufs werden die Signale der optischen Erkennungselemente 20, 22 am Druckschlitten 12 genutzt, die die Seitenkanten des Belegs erkennen. Die Signale der Belegseitenkantenerkennung 20, 22 werden zur Steuerung der Überstreichbewegung verwendet. Beide Überstreichbewegungen verlaufen dann nur bis zum Zeitpunkt des Erkennens der Seitenkante. Der Druckschlitten hält in dieser Position an und kehrt um. Mit diesem erfindungsgemäßen Verfahrensablauf wird die Zeit für die Überstreichbewegungen wegen der kürzeren Wege minimiert.In another embodiment of this process sequence, the signals from the optical recognition elements 20, 22 on the print carriage 12, which recognize the side edges of the document, are used. The signals of the document side edge detection 20, 22 are used to control the sweeping movement. Both sweep movements then only run until the side edge is recognized. The carriage stops in this position and reverses. With this process sequence according to the invention, the time for the sweeping movements is minimized because of the shorter distances.

Die Antriebe für den Belegtransport werden in der Regel mit Schrittmotoren ausgelegt. Diese Schrittmotoren werden für die erfindungsgemäßen Transportschritte in Einzugs- und Ausgaberichtung in kleinstmöglichen Schritten angesteuert. Beispielsweise wäre eine Schrittweite von 1/180 Zoll gegenüber einer normalen Schrittweite von 1/6 Zoll ansteuerbar.The drives for document transport are usually designed with stepper motors. These stepper motors are controlled in the smallest possible steps for the transport steps according to the invention in the feed and discharge directions. For example, a step size of 1/180 inch would be controllable compared to a normal step size of 1/6 inch.

Die erste Überstreichbewegung des Druckschlittens erfolgt vorzugsweise in die Richtung der von der aktuellen Druckkopfposition weiter entfernten Belegseitenkante. Die Lage der Belegseitenkanten wird durch weitere, nicht dargestellte optische Erkennungseinrichtungen erfaßt, die in der Transporteinrichtung integriert sind. Die Position der letzten Druckposition wird der elektronischen Steuerung des Druckvorgangs entnommen. Hieraus werden elektronisch die beiden Wege jeweils zu den Belegseitenkanten berechnet und der längere Weg als erster angesteuert.The first sweeping movement of the print carriage preferably takes place in the direction of the document side edge further away from the current print head position. The position of the document side edges is detected by further optical recognition devices, not shown, which are integrated in the transport device. The position of the last printing position is taken from the electronic control of the printing process. From this, the two routes to the edges of the document are calculated electronically and the longer route is the first to be controlled.

Bei schmaleren Belegen kann der Druckkopf in der Endposition der letzten Überstreichbewegung verbleiben. Zumindest bei breiten Belegen wird der Druckschlitten mit einer zusätzlichen Bewegung in die Mitte des Belegs gefahren.In the case of narrower documents, the print head can remain in the end position of the last scanning movement. At least with wide documents, the print carriage is moved to the center of the document with an additional movement.

Selbstverständlich kann das erfindungsgemäße Verfahren nicht nur beim Auswurf eines Beleges benutzt werden. Belege mit aufgewölbter Vorderkante können beim Einziehen in die Druckstation in gleicher Weise zuverlässig unter das Leitblech 58 und damit in den Abförderschacht 60 geleitet werden.Of course, the method according to the invention cannot only be used when ejecting a receipt. Receipts with a curved leading edge can be reliably guided under the guide plate 58 and thus into the discharge shaft 60 when they are drawn into the printing station.

Claims (5)

  1. Process for guiding a document into the transporting channel (56, 60) of a document-processing unit, in particular a flat-bed printer, having a printing slide (12) which can be moved along a print line and on which a print head (14) and document-directing devices (30, 32) are arranged, a printing platen (16), lying opposite the print head (14), a supporting table (48) and at least one directing baffle (52, 58), arranged parallel to and at a distance from the latter and forming with the supporting table (48) a transporting channel (56, 60) widening in the form of a funnel at the printing platen (16), and having a document-transporting device, characterized in that a document (50) to be conveyed is transported by its leading edge - seen in conveying direction (B) - to such an extent in the direction of the transporting channel (56, 60) that a flat document (50b) protrudes by a small amount (d), preferably 2 mm, into the transporting channel (56, 60) and an arched or creased document (50c) can be supported by its leading edge against the edge (54, 62) of the directing baffle (52, 58), and thereafter the printing slide (12) is moved transversely to the document-transporting direction in at least one brushing-over movement.
  2. Process according to Claim 1, characterized in that, before transport of the document (50) in the direction of the transporting channel (56), the printing slide (12) performs an additional brushing-over movement.
  3. Process according to Claim 1 or 2, characterized in that the brushing-over movements of the printing slide (12) take place up to the end-of-line position.
  4. Process according to one of Claims 1 or 2, the document-processing unit being equipped with detecting devices (20, 22) for the side edges of the document, characterized in that the brushing-over movements of the printing slide (12) take place only up to the document side edge.
  5. Process according to one of the preceding claims, characterized in that, after a brushing-over movement, the print head is moved to approximately the centre of the document before the following transporting step.
EP92924566A 1991-12-13 1992-12-11 Process for feeding a sheet into a processing unit Expired - Lifetime EP0616572B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4141107 1991-12-13
DE4141107 1991-12-13
PCT/DE1992/001037 WO1993011945A1 (en) 1991-12-13 1992-12-11 Process for feeding a sheet into a processing unit

Publications (2)

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EP0616572A1 EP0616572A1 (en) 1994-09-28
EP0616572B1 true EP0616572B1 (en) 1995-05-17

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EP92924566A Expired - Lifetime EP0616572B1 (en) 1991-12-13 1992-12-11 Process for feeding a sheet into a processing unit

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US (1) US5478163A (en)
EP (1) EP0616572B1 (en)
JP (1) JPH07501761A (en)
DE (1) DE59202270D1 (en)
WO (1) WO1993011945A1 (en)

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Publication number Priority date Publication date Assignee Title
CN1090586C (en) * 1997-06-20 2002-09-11 西铁城时计株式会社 Printer
US6493018B1 (en) * 1999-04-08 2002-12-10 Gerber Scientific Products, Inc. Wide format thermal printer
US9446607B2 (en) * 2014-09-18 2016-09-20 Xerox Corporation Spacer with integral flange for print head protection
WO2017106173A1 (en) * 2015-12-18 2017-06-22 Kimberly-Clark Worldwide, Inc. Apparatus for controlling movement of a substrate

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DE2715506C3 (en) * 1977-04-06 1980-09-04 Nixdorf Computer Ag, 4790 Paderborn Document feed and printing device
JPS58151278A (en) * 1982-03-05 1983-09-08 Hitachi Ltd Slip printer
JPS6353073A (en) * 1986-08-23 1988-03-07 Oki Electric Ind Co Ltd Paper-feeding method for printer
JPH0655527B2 (en) * 1987-11-06 1994-07-27 株式会社精工舎 How to set cut paper in the printer
JPH01206077A (en) * 1988-02-12 1989-08-18 Tokyo Electric Co Ltd Printing device
JP2674778B2 (en) * 1988-04-27 1997-11-12 沖電気工業株式会社 Printer
DE3818167A1 (en) * 1988-05-26 1989-11-30 Mannesmann Ag DEVICE FOR THE TRANSPORT OF RECORD CARRIERS IN OFFICE MACHINES, ESPECIALLY FOR RECEIPT IN RECEIPT PROCESSING DEVICES

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Title
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Patent Abstracts of Japan, vol.14, no.46,(M-926); & JP-A-1 275082 (OKI ELECTRIC IND CO LTD) 02 November 1989. *

Also Published As

Publication number Publication date
DE59202270D1 (en) 1995-06-22
JPH07501761A (en) 1995-02-23
US5478163A (en) 1995-12-26
WO1993011945A1 (en) 1993-06-24
EP0616572A1 (en) 1994-09-28

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