EP0649740B1 - Printing unit for a web printing machine - Google Patents

Printing unit for a web printing machine Download PDF

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Publication number
EP0649740B1
EP0649740B1 EP94810519A EP94810519A EP0649740B1 EP 0649740 B1 EP0649740 B1 EP 0649740B1 EP 94810519 A EP94810519 A EP 94810519A EP 94810519 A EP94810519 A EP 94810519A EP 0649740 B1 EP0649740 B1 EP 0649740B1
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EP
European Patent Office
Prior art keywords
printing
cylinders
cylinder
saddle
web
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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
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EP94810519A
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German (de)
French (fr)
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EP0649740A1 (en
Inventor
Joachim Alfred Heinz Lapp
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KBA Notasys SA
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De la Rue Giori SA
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Publication of EP0649740A1 publication Critical patent/EP0649740A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F13/00Common details of rotary presses or machines
    • B41F13/02Conveying or guiding webs through presses or machines
    • B41F13/04Conveying or guiding webs through presses or machines intermittently

Definitions

  • the invention relates to a printing unit for a web press according to the preamble of Claim.
  • Printing units in which those forming the printing nip Cylinders like the cylinders of sheet-fed printing machines have pressure saddles separated by cylinder pits and the paper web in the so-called mit step is transported are in DE-31 35 696C3 and described in EP-A-0 415 881.
  • These well-known Printing units are either offset printing units with two interacting rubber cylinders, both with Print images are colored and used for production a perfecting, or intaglio printing with a plate cylinder that with a Pressure cylinder cooperates.
  • the print format change consists in the fact that an equally large pressure plate with a shorter print image is spanned, ie the pressure zone remains the same and is not shortened.
  • Figure 1 shows the beginning of a printing operation and Figure 2 shows the end of this printing operation after the cylinders in the direction of the arrow are one of the length D have turned the angle corresponding to the pressure zone.
  • the means if the circumferential length of the printed image is practical is equal to the circumferential length of a saddle, then the paper web 7 after each printing operation if it freely moves the cylinder pits 3, 6, so slowed down, pulled back and accelerated again that, depending on the printing speed, the realizable delay and Acceleration as well as the time in which the pit is going through is approximately the same when the print is used again occupies the same position relative to the pressure gap, which she had taken before the civilage.
  • the paper web can be changed after the end of the Print image will not be delayed immediately, but will transported at print speed before the Pilgrim step can use. This way, as mentioned, are additionally withdrawn in the vocational step.
  • the paper web is especially used in intaglio printing due to the very high pressure of up to 80 t per meter web width can be, and the high-gloss chrome-plated Surface of the pressure plate compressed in such a way that after withdrawing the pressed, but section Z of the paper web not printed with color in the subsequent printing process with poorer quality is printed as the non-pressed web.
  • the Figures 1 and 2 are the too much pressed web section Z and the section of the double pressure P illustrated. The pressure of section Z in Figure 1 is stirring from the previous printing process.
  • the two that form the pressure gap Cylinders, transfer cylinders and impression cylinders are with a pressure cover or a counter pressure cover provided, which extends only over part of the circumference of the relevant cylinder, especially over half Scope, stretches, while the remaining scope is not one forming depression, the depth of which corresponds to the thickness of the Pressure reference or counter pressure reference corresponds.
  • the Transfer cylinder and the impression cylinder angular with respect to the position of their in the pressure gap cooperating, the pressure calipers, each according to the format to be printed, a circumferential distance offset to each other, which at least approximately equal to the difference between the Circumferential length of a pressure caliper and the circumferential length of a print image, so the length of the print zone, along which two pressure saddles when passing the Pinch the paper web between them, only at least approximately as big as that Circumferential length of a printed image is.
  • the object of the present invention is to achieve this based on the in the preamble of Features specified in a known Web printing machine according to FR-A-2309337, for one given angular displacement of the two Pressure gap forming cylinder the length of the pressure zone and automatically determine their angular position, so that the movement of the paper web as a function of this both sizes in the corresponding vocational step operation is controllable.
  • Figures 1 and 2 illustrate, as already mentions the printing operation of a known sheet-fed printing unit when printing on a paper web that is in the Pilgrimage is transported and
  • Figures 3 and 4 illustrate a printing unit according to the invention and its operation, wherein Figure 3 the start of a printing operation and Figure 4 the end this printing operation shows after both Cylinder at an angle corresponding to the pressure zones D. have turned.
  • Cylinders 1 and 4 are, for example around the plate cylinder 4 and the impression cylinder 1 of an intaglio printing unit.
  • the direction of rotation of the cylinders is indicated by curved arrows.
  • Both Cylinders have three equal sizes along their circumference Equidistantly arranged pressure saddles 2 and 5 with the Circumferential length S, which by cylinder pits 3 or 6 with the circumferential length G are separated from each other.
  • S Circumferential length
  • G are separated from each other.
  • the Print image on the printing plates has a circumferential length B, which is less than the length S of the pressure saddle in question 5 is.
  • the pressure plates are so stretched that the end E of the printed image with the in the direction of rotation rear end of the pressure saddle 5 coincides while the beginning A of the printed image B corresponding to the beginning of the pressure saddle 5 is offset.
  • the impression cylinder is 1st angularly adjusted with respect to the plate cylinder 4, that those interacting in the pressure gap Pressure calipers 2 and 5 of both cylinders against each other are offset that the circumferential length D of Pressure zone in which the interacting pressure saddles pinch the paper web 7, just do that printing format, i.e. the circumferential length B of the Print image, includes.
  • the circumferential length B of the Print image includes.
  • this is in the direction of rotation front end of the printing saddle 2 of the printing cylinder 1 opposite the front end of the pressure saddle 5 um offset a section which is equal to the difference S - B is.
  • the size is this displacement a little bit less.
  • the pinching area of the web during the printing operation is substantially shortened to the circumferential length B of the format to be printed and thus the length of the pressure-free zone G + (S - B) is enlarged, more time is available for retracting the paper web, that is, for decelerating and accelerating.
  • the paper web does not need to be pulled back, since it becomes free immediately after the end of the printed image and can be delayed.
  • the essential thing is that the paper web is only clamped immediately before the start A of the printed image and is released again immediately after the end E of the printed image. This has the advantage that with constant deceleration and acceleration torques that are caused by the drive, the machine speed can be increased by the extended pressure-free zone. The shorter repetition length with a smaller print image can therefore be compensated for by a higher speed.
  • the smaller the length B of the printed image the larger the pressure-free zone that is available for retracting the correspondingly larger paper web section.
  • Another advantage is that at no additional paper web section during a printing process is pressed outside the printed image and therefore a double pressing according to the double pressed Section P of the paper web according to FIG. 2 is omitted, see above that a deterioration in quality is avoided.
  • plate cylinder and cylinder 4 be the impression cylinder.
  • the beginning begins A of the printed image with the front one in the direction of rotation End of the pressure saddle of the plate cylinder together, and it is this plate cylinder that is opposite offset to the direction of rotation with respect to the pressure cylinder is.
  • the print image must be on a Printing plate either with its beginning A with the beginning of the pressure saddle in question or with its end E coincide with the end of the pressure saddle in question.
  • the length D and the angular position of the print zone can be determined automatically. This is shown in the example according to Figures 3 and 4 on the circumference of the printing cylinder 1 a trigger member K is attached so that it then exactly at a permanently installed initiator or sensor I, which responds to this organ, moved past when the beginning of the pressure zone, i.e. the Start A of the printed image, the connecting line happens between the axes of both cylinders 1 and 4; this position is shown in Figure 3.
  • sensor I responds, a signal is generated that in a counter by a plate cylinder 5 attached encoder in the form of a pulse encoder is controlled, keeps a meter reading and this saves.

Abstract

The printing unit has two interacting nip-forming cylinders (1, 4) which exhibit printing saddles (2, 5) separated by cylinder grooves (3, 6). The paper web (7) passing the nip is transported in pilgrim-step operation in order to print adjoining formats. The two cylinders (1, 4) can be adjusted at an angle, with respect to the position of their printing saddles (2, 5) interacting in the nip, offset with respect to one another by a circumferential distance which is approximately equal to the difference between the circumferential length (S) of a printing saddle and the circumferential length (B) of a printed image. Consequently, the printed zone is only approximately as large as the printed image, and the printing-free zone available for drawing back the paper web is correspondingly enlarged. <IMAGE>

Description

Die Erfindung bezieht sich auf ein Druckwerk für eine Rollendruckmaschine gemäss dem Oberbegriff des Patentanspruchs.The invention relates to a printing unit for a web press according to the preamble of Claim.

Druckwerke, in denen die den Druckspalt bildenden Zylinder nach Art der Zylinder von Bogendruckmaschinen durch Zylindergruben getrennte Drucksättel aufweisen und die Papierbahn im sogenannten Pilgerschritt transportiert wird, sind in der DE-31 35 696C3 und in der EP-A-0 415 881 beschrieben. Diese bekannten Druckwerke sind entweder Offset-Druckwerke mit zwei zusammenwirkenden Gummizylindern, welche beide mit Druckbildern eingefärbt werden und zur Herstellung eines Schön- und Widerdrucks dienen, oder Stichtiefdruckwerke mit einem Plattenzylinder, der mit einem Druckzylinder zusammenwirkt. Die Verwendung von Bogendruckwerken zum Bedrucken einer kontinuierlichen Papierbahn hat den Vorteil, dass auf die schwierige und zeitraubende Herstellung von Platten-, Druck- bzw. Gummizylindern mit kontinuierlicher, fugenloser Umfangsfläche verzichtet werden kann; statt dessen werden die einfacher herzustellenden Zylinder mit voneinander getrennten Drucksätteln verwendet, auf denen die einzelnen Druckplatten oder Druckbezüge ohne grosse Schwierigkeiten individuell aufgespannt, justiert und ausgewechselt werden können. Ausserdem erlaubt der Transport der Papierbahn im sogenannten Pilgerschrittbetrieb, dass stets aneinander anschliessende Bilder, ohne Papierverlust infolge unbedruckter Lücken zwischen den Bildern, herstellbar sind, dass also durch die Zylindergruben keine unbedruckten Streifen zwischen aufeinanderfolgenden Druckbildern entstehen. Zu diesem Zwecke wird der Transport der Papierbahn, wie insbesondere in der EP-A-0 415 881 beschrieben, mittels eines Steuersystems so gesteuert, dass nach jeder Druckoperation die nicht mehr eingeklemmte Papierbahn beim Passieren der miteinander ausgerichteten Zylindergruben beider Zylinder zunächst abgebremst, dann rückwärtsbewegt und schliesslich wieder auf Betriebsgeschwindigkeit beschleunigt wird, bevor sie zwischen den folgenden zusammenwirkenden Drucksätteln der beiden Zylinder für die folgende Druckoperation erneut eingeklemmt wird. Die Strecke, um welche die Papierbahn dabei relativ zum Umfang der beiden Zylinder zurückgezogen wird, ist so gewählt, dass aufeinanderfolgende Druckbilder praktisch lückenlos gedruckt werden. Dazu muss also die Pilgerschrittbewegung so gesteuert werden, dass die Papierbahn nach dem Pilgerschritt wenigstens näherungsweise die gleiche Position relativ zum Druckspalt zwischen den beiden Zylindern, das heisst innerhalb der Maschine, einnimmt wie vor dem Pilgerschritt.Printing units in which those forming the printing nip Cylinders like the cylinders of sheet-fed printing machines have pressure saddles separated by cylinder pits and the paper web in the so-called pilgrim step is transported are in DE-31 35 696C3 and described in EP-A-0 415 881. These well-known Printing units are either offset printing units with two interacting rubber cylinders, both with Print images are colored and used for production a perfecting, or intaglio printing with a plate cylinder that with a Pressure cylinder cooperates. The use of sheet-fed printing units for printing on a continuous paper web has the advantage that on the difficult and time-consuming production of plate, printing or Rubber cylinders with a continuous, seamless peripheral surface can be dispensed with; instead the easier to manufacture cylinders with each other used separate calipers on which the individual printing plates or printing covers without large Difficulties individually spanned, adjusted and can be replaced. In addition, the Transport of the paper web in the so-called pilgrim step operation, that pictures that are always connected without paper loss due to unprinted gaps between the pictures that can be produced, that is, by the Cylinder pits no unprinted strips between successive print images arise. To this Purposes is the transportation of the paper web, such as described in particular in EP-A-0 415 881, by means of of a tax system so controlled that after each Printing operation the no longer pinched paper web when passing through the aligned cylinder pits both cylinders first braked, then moved backwards and finally back to operating speed is accelerated before moving between the following interacting pressure calipers of the two Cylinder pinched again for the following printing operation becomes. The distance by which the paper web withdrawn relative to the circumference of the two cylinders is chosen so that successive Print images can be printed practically without gaps. To So the pilgrim step movement must be controlled in this way that the paper web after the pilgrimage step at least approximately the same position relative to the pressure gap between the two cylinders, that means inside the machine, takes as before Pilgrim step.

Durch entsprechende Anpassung der Pilgerschrittbewegung lassen sich mit ein und derselben Druckmaschine auch bei veränderten Formaten des Druckbildes, also bei kürzeren Formaten, lückenlos aneinander anschliessende Bilder drucken. Die Druckformatänderung besteht darin, dass eine gleich grosse Druckplatte mit einem kürzeren Druckbild aufgespannt wird, wobei also die Druckzone gleich bleibt und nicht verkürzt ist. By adapting the pilgrim step movement accordingly can be printed on the same press even with changed formats of the printed image, that is, in the case of shorter formats, contiguously adjacent Print pictures. The print format change consists in the fact that an equally large pressure plate with a shorter print image is spanned, ie the pressure zone remains the same and is not shortened.

Bei den bisher bekannten Rollendruckmaschinen dieser Art sind die beiden Zylinder stets so zueinander eingestellt, dass die Drucksättel bei ihrem Zusammenwirken im Druckspalt genau einander gegenüberliegen, wie in den Figuren 1 und 2 für die beiden Zylinder 1 und 4 dargestellt, die je drei Drucksättel 2 bzw. 5 mit der Umfangslänge S aufweisen. Hierbei ist also die Länge D der Druckzone, längs welcher die Papierbahn 7 zwischen beiden Zylindern eingeklemmt wird, stets genauso gross wie die Umfangslänge S eines Drucksattels, und zwar unabhängig von der Umfangslänge B des Druckbildes, also vom Format.In the previously known web printing machines In this way, the two cylinders are always so to each other set that the pressure calipers work together exactly opposite each other in the pressure gap, as in FIGS. 1 and 2 for the two cylinders 1 and 4, each with three pressure calipers 2 and 5 have the circumferential length S. So here is the Length D of the printing zone along which the paper web 7 between two cylinders, always the same size as the circumferential length S of a pressure saddle, regardless of the circumferential length B of the Print image, i.e. of the format.

Daher ist natürlich auch die druckfreie Zone zwischen zwei Druckzonen entsprechend der Länge G einer Zylindergrube und damit die Zeitspanne stets gleich, die für das Zurückziehen der Papierbahn zur Verfügung steht.Therefore, of course, is the pressure-free zone between two pressure zones corresponding to the length G one Cylinder pit and thus the time span always the same, those available for retracting the paper web stands.

Figur 1 zeigt den Beginn einer Druckoperation und Figur 2 das Ende dieser Druckoperation, nachdem sich also die Zylinder im Pfeilsinne um einen der Länge D der Druckzone entsprechenden Winkel gedreht haben. Wenn das maximal mögliche Format gedruckt wird, das heisst, wenn die Umfangslänge des Druckbildes praktisch gleich der Umfangslänge eines Drucksattels ist, dann muss die Papierbahn 7 nach jeder Druckoperation, wenn sie frei beweglich die Zylindergruben 3, 6 passiert, so abgebremst, zurückgezogen und wieder beschleunigt werden, dass sie, in Abhängigkeit von der Druckgeschwindigkeit, der realisierbaren Verzögerung und Beschleunigung sowie der Zeit, in der die Grube durchlaufen wird, bei erneutem Druckeinsatz annähernd die gleiche Position relativ zum Druckspalt einnimmt, welche sie vor dem Pilgerschritt eingenommen hatte. Figure 1 shows the beginning of a printing operation and Figure 2 shows the end of this printing operation after the cylinders in the direction of the arrow are one of the length D have turned the angle corresponding to the pressure zone. If the maximum possible format is printed, the means if the circumferential length of the printed image is practical is equal to the circumferential length of a saddle, then the paper web 7 after each printing operation if it freely moves the cylinder pits 3, 6, so slowed down, pulled back and accelerated again that, depending on the printing speed, the realizable delay and Acceleration as well as the time in which the pit is going through is approximately the same when the print is used again occupies the same position relative to the pressure gap, which she had taken before the pilgrimage.

Wenn jedoch kleinere Formate gedruckt werden sollen, bei welchen - wie in den Figuren 1 und 2 veranschaulicht - die Umfangslänge B eines Druckbildes kleiner als die Umfangslänge S eines Drucksattels ist, dann muss die Papierbahn 7 nach jeder Druckoperation um eine grössere Strecke zurückgezogen und wieder beschleunigt werden, welche sicherstellt, dass die Position der Papierbahn bei erneutem Druckeinsatz zusätzlich um die Differenz aus Länge der Druckzone D und Länge des Druckbildes B, also um die Strecke D-B, relativ zum Druckspalt gegen die Laufrichtung zurückversetzt ist.However, when printing smaller formats should, in which - as illustrated in Figures 1 and 2 - The circumferential length B of a printed image is smaller than the circumferential length S of a pressure saddle, then the paper web 7 has to move after each printing operation withdrawn a greater distance and accelerated again which ensures that the position the paper web when printing is used again by the difference between the length of the printing zone D and Length of the printed image B, i.e. by the distance D-B, set back against the direction of travel relative to the pressure gap is.

Im Beispiel nach den Figuren 1 und 2 fällt der Druckanfang A mit dem Bildanfang zusammen, während das Druckende E der Druckzone um die erwähnte Differenzstrecke D-B hinter dem Bildende F liegt, diese Differenz ist mit Z bezeichnet. Die Papierbahn 7 muss also in diesem Falle bei jedem erneuten Druckeinsatz eine Position relativ zum Druckspalt einnehmen, die um die Länge Z gegen die Laufrichtung nach hinten versetzt ist, wenn man praktisch lückenlos aufeinanderfolgende Druckbilder auf der Papierbahn zu erhalten wünscht, wie in Figur 1 angedeutet.In the example according to FIGS. 1 and 2, the Start of print A together with the beginning of the picture, while the Printing end E of the printing zone around the mentioned distance D-B lies behind the end of the image F, this one Difference is denoted by Z. The paper web 7 must So in this case with each new print job take a position relative to the nip that around the length Z offset against the direction of travel to the rear is when you're practically consecutive How to get print images on the paper web desires indicated in Figure 1.

Der Umstand, dass die Länge D der Druckzone, auch bei Herstellung von Druckbildern kleineren Formats, stets konstant bleibt, hat verschiedene Nachteile :The fact that the length D of the pressure zone, even when producing printed images smaller Format, which always remains constant, has various disadvantages :

Da die Papierbahn nach jeder Druckoperation um eine Strecke Z zusätzlich zurückgezogen werden muss, bedeutet das für kleinere Formate, also für grössere Z, eine erheblich grössere Verzögerung und Beschleunigung der Papierbahn gegenüber dem Druckbetrieb, bei dem das maximale Druckformat hergestellt wird. Dabei ist folgendes zu berücksichtigen : Because the paper web turns after every printing operation a distance Z must also be withdrawn, this means for smaller formats, i.e. for larger Z, a significantly greater deceleration and acceleration the paper web compared to the printing company where the maximum print format is produced. It is to consider the following:

Wird die Papierbahn nach der Druckzone freigegeben, bewegt sie sich zunächst entsprechend der Höhe der Druckgeschwindigkeit und der realisierbaren Verzögerung noch ein Stück weiter, bis sie steht. Diese Strecke, die die Papierbahn hierbei zurückgelegt hat, fällt dabei doppelt ins Gewicht, da sie noch einmal bei der Beschleunigung nach dem Stillstand der Papierbahn zu berücksichtigen ist. Daher muss die Papierbahn um das Doppelte dieser Strecke zurückgezogen werden, damit sie nach anschliessender Beschleunigung wieder mit Druckgeschwindigkeit an denselben Ort gelangt, den sie vor dem Pilgerschritt eingenommen hat.If the paper web is released after the printing zone, it initially moves according to the height the printing speed and the realizable delay a little further until it stands. This Distance that the paper web has covered is twice as important since it is added again acceleration after the paper web has come to a standstill is to be considered. Therefore, the paper web has to double that distance to be withdrawn so after accelerating again Printing speed gets to the same place as it before the pilgrimage step.

Ist nun die Drucksattellänge grösser als die Druckbildlänge, kann die Papierbahn nach Ende des Druckbildes nicht sofort verzögert werden, sondern wird mit Druckgeschwindigkeit weitertransportiert, bevor der Pilgerschritt einsetzen kann. Dieser Weg muss, wie erwähnt, im Pilgerschritt zusätzlich zurückgezogen werden.Now the saddle length is greater than that Print image length, the paper web can be changed after the end of the Print image will not be delayed immediately, but will transported at print speed before the Pilgrim step can use. This way, as mentioned, are additionally withdrawn in the pilgrimage step.

Da jedoch der Verzögerung und Beschleunigung der Papierbahn Grenzen gesetzt sind, ist eine Drehzahlreduzierung der Maschine erforderlich. Dieser Leistungsverlust wirkt sich somit doppelt aus, da je Umdrehung ein kürzeres Druckbild erzeugt wird und zusätzlich die Drehzahl verringer werden muss.However, since the deceleration and acceleration of the Paper web limits are a speed reduction the machine. This loss of performance therefore has a double effect, as per revolution a shorter print image is generated and in addition the Speed must be reduced.

Ferner wird die Papierbahn speziell beim Stichtiefdruck durch den sehr hohen Druck, der bis zu 80 t je Meter Bahnbreite betragen kann, und die hochglanzverchromte Oberfläche der Druckplatte derart verdichtet, dass nach dem Zurückziehen der gepresste, aber nicht mit Farbe bedruckte Abschnitt Z der Papierbahn beim folgenden Druckvorgang mit schlechterer Qualität gedruckt wird als die nicht gepresste Bahn. In den Figuren 1 und 2 sind der zuviel gepresste Bahnabschnitt Z und der Abschnitt der Doppelpressung P veranschaulicht. Die Pressung des Abschnitts Z in Figur 1 rührt vom vorangehenden Druckvorgang her.Furthermore, the paper web is especially used in intaglio printing due to the very high pressure of up to 80 t per meter web width can be, and the high-gloss chrome-plated Surface of the pressure plate compressed in such a way that after withdrawing the pressed, but section Z of the paper web not printed with color in the subsequent printing process with poorer quality is printed as the non-pressed web. In the Figures 1 and 2 are the too much pressed web section Z and the section of the double pressure P illustrated. The pressure of section Z in Figure 1 is stirring from the previous printing process.

Nun wird in der FR-A-2309337 eine mit einem Papierbahntransport im Pilgerschritt arbeitende Rollendruckmaschine beschrieben, die sich zwar von den obenstehend erwähnten bekannten Rollendruckmaschinen im Aufbau unterscheidet, jedoch durch eine besondere winkelmässige Anordnung der beiden den Druckspalt bildenden Zylinder die vorstehend erläuterten Nachteile beseitigt. In dieser Druckmaschine arbeitet ein Plattenzylinder mit einem Transferzylinder zusammen, auf den das Bild von der Druckplatte übertragen wird und der seinerseits mit einem Gegendruckzylinder zusammenwirkt. Die beiden, den Druckspalt bildenden Zylinder, Transferzylinder und Gegendruckzylinder, sind mit einem Druckbezug bzw. einem Gegendruckbezug versehen, der sich nur über einen Teil des Umfangs des betreffenden Zylinders, insbesondere über den halben Umfang, erstreckt, während der übrige Umfang eine nicht druckende Vertiefung bildet, deren Tiefe der Dicke des Druckbezugs bzw. Gegendruckbezugs entspricht. Gemäss einer besonderen Ausführungsform sind der Transferzylinder und der Gegendruckzylinder winkelmässig bezüglich der Lage ihrer im Druckspalt zusammenwirkenden, die Drucksättel bildenden Bezüge, je nach dem zu druckenden Format, um eine Umfangsstrecke versetzt zueinander eingestellt, welche wenigstens näherungsweise gleich der Differenz zwischen der Umfangslänge eines Drucksattels und der Umfangslänge eines Druckbildes ist, so dass die Länge der Druckzone, längs welcher zwei Drucksättel beim Passieren des Druckspalts die Papierbahn zwischen sich einklemmen, nur wenigstens näherungsweise so gross wie die Umfangslänge eines Druckbildes ist.Now in FR-A-2309337 one with one Paper web transport in the pilgrim step Web press described, which are different from the known roll printing machines mentioned above in Structure differs, but by a special one angular arrangement of the two the pressure gap forming cylinders the disadvantages explained above eliminated. One works in this printing machine Plate cylinder together with a transfer cylinder, to which the image is transferred from the printing plate and the one with an impression cylinder cooperates. The two that form the pressure gap Cylinders, transfer cylinders and impression cylinders are with a pressure cover or a counter pressure cover provided, which extends only over part of the circumference of the relevant cylinder, especially over half Scope, stretches, while the remaining scope is not one forming depression, the depth of which corresponds to the thickness of the Pressure reference or counter pressure reference corresponds. According to a special embodiment are the Transfer cylinder and the impression cylinder angular with respect to the position of their in the pressure gap cooperating, the pressure calipers, each according to the format to be printed, a circumferential distance offset to each other, which at least approximately equal to the difference between the Circumferential length of a pressure caliper and the circumferential length of a print image, so the length of the print zone, along which two pressure saddles when passing the Pinch the paper web between them, only at least approximately as big as that Circumferential length of a printed image is.

Dadurch wird insbesondere bei jeder Zylinderumdrehung die druckfreie Zone und damit die Zeit vergrössert, in welcher die Papierbahn zurückgezogen und wieder beschleunigt werden kann.This is especially true for everyone Cylinder rotation the pressure-free zone and thus the Increased time in which the paper web can be withdrawn and accelerated again.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ausgehend von den im Oberbegriff des Patentanspruchs angegebenen Merkmalen einer bekannten Rollendruckmaschine nach der FR-A-2309337, für eine gegebene winkelmässige Versetzung der beiden den Druckspalt bildenden Zylinder die Länge der Druckzone und deren Winkelposition automatisch zu ermitteln, so dass die Bewegung der Papierbahn als Funktion dieser beiden Grössen im entsprechenden Pilgerschrittbetrieb steuerbar ist.The object of the present invention is to achieve this based on the in the preamble of Features specified in a known Web printing machine according to FR-A-2309337, for one given angular displacement of the two Pressure gap forming cylinder the length of the pressure zone and automatically determine their angular position, so that the movement of the paper web as a function of this both sizes in the corresponding pilgrim step operation is controllable.

Diese Aufgabe wird erfindungsgemäss durch die im Kennzeichen des Patentanspruchs angegebenen Merkmale gelöst. This object is achieved by the im Characteristics of the features specified solved.

Die Erfindung wird anhand der Zeichnungen an einem Ausführungsbeispiel näher erläutert.The invention is based on the drawings an embodiment explained in more detail.

Die Figuren 1 und 2 veranschaulichen, wie bereits erwähnt, den Druckbetrieb eines bekannten Bogendruckwerks beim Bedrucken einer Papierbahn, die im Pilgerschritt transportiert wird undFigures 1 and 2 illustrate, as already mentions the printing operation of a known sheet-fed printing unit when printing on a paper web that is in the Pilgrimage is transported and

Figuren 3 und 4 veranschaulichen ein Druckwerk nach der Erfindung und dessen Betrieb, wobei Figur 3 den Beginn einer Druckoperation und Figur 4 das Ende dieser Druckoperation zeigt, nachdem sich also beide Zylinder um einen der Druckzonen D entsprechenden Winkel gedreht haben.Figures 3 and 4 illustrate a printing unit according to the invention and its operation, wherein Figure 3 the start of a printing operation and Figure 4 the end this printing operation shows after both Cylinder at an angle corresponding to the pressure zones D. have turned.

Bei den beiden, in den Figuren 3 und 4 dargestellten Zylindern 1 und 4 handelt es sich beispielsweise um den Plattenzylinder 4 und den Druckzylinder 1 eines Stichtiefdruckwerks. Die Drehrichtung der Zylinder ist durch gekrümmte Pfeile angedeutet. Beide Zylinder weisen drei gleich grosse, längs ihres Umfangs äquidistant angeordnete Drucksättel 2 bzw. 5 mit der Umfangslänge S auf, welche durch Zylindergruben 3 bzw. 6 mit der Umfangslänge G voneinander getrennt sind. Auf den Drucksätteln 2 des Druckzylinders 1 sind Druckbezüge und auf den Drucksätteln 5 des Plattenzylinders 4 Stichtiefdruckplatten aufgespannt. Das Druckbild auf den Druckplatten hat eine Umfangslänge B, die kleiner als die Länge S des betreffenden Drucksattels 5 ist.In the two, shown in Figures 3 and 4 Cylinders 1 and 4 are, for example around the plate cylinder 4 and the impression cylinder 1 of an intaglio printing unit. The direction of rotation of the cylinders is indicated by curved arrows. Both Cylinders have three equal sizes along their circumference Equidistantly arranged pressure saddles 2 and 5 with the Circumferential length S, which by cylinder pits 3 or 6 with the circumferential length G are separated from each other. Are on the pressure calipers 2 of the printing cylinder 1 Printed covers and on the pressure calipers 5 of the plate cylinder 4 intaglio printing plates clamped. The Print image on the printing plates has a circumferential length B, which is less than the length S of the pressure saddle in question 5 is.

Im betrachteten Beispiel sind die Druckplatten so aufgespannt, dass das Ende E des Druckbildes mit dem in Drehrichtung hinteren Ende des Drucksattels 5 zusammenfällt, während der Anfang A des Druckbildes B gegenüber dem Anfang des Drucksattels 5 entsprechend versetzt ist. Wie dargestellt, ist der Druckzylinder 1 winkelmässig gegenüber dem Plattenzylinder 4 so eingestellt, dass die im Druckspalt zusammenwirkenden Drucksättel 2 und 5 beider Zylinder derart gegeneinander versetzt sind, dass die Umfangslänge D der Druckzone, in welcher die zusammenwirkenden Drucksättel die Papierbahn 7 einklemmen, gerade nur das zu druckende Format, also die Umfangslänge B des Druckbildes, einschliesst. Unter Berücksichtigung der freien Ränder der auf die Papierbahn aufgebrachten Druckbilder muss natürlich praktisch die Druckzone geringfügig länger als das Druckbild sein.In the example considered, the pressure plates are so stretched that the end E of the printed image with the in the direction of rotation rear end of the pressure saddle 5 coincides while the beginning A of the printed image B corresponding to the beginning of the pressure saddle 5 is offset. As shown, the impression cylinder is 1st angularly adjusted with respect to the plate cylinder 4, that those interacting in the pressure gap Pressure calipers 2 and 5 of both cylinders against each other are offset that the circumferential length D of Pressure zone in which the interacting pressure saddles pinch the paper web 7, just do that printing format, i.e. the circumferential length B of the Print image, includes. Under consideration of free edges of the applied to the paper web Print images must of course practically the print zone slightly longer than the printed image.

Gemäss den Figuren 3 und 4 ist das in Drehrichtung vordere Ende des Drucksattels 2 des Druckzylinders 1 gegenüber dem vorderen Ende des Drucksattels 5 um einen Abschnitt versetzt, welcher gleich der Differenz S - B ist. In der Praxis ist, wie erwähnt, die Grösse dieser Versetzung ein klein wenig geringer.According to FIGS. 3 and 4, this is in the direction of rotation front end of the printing saddle 2 of the printing cylinder 1 opposite the front end of the pressure saddle 5 um offset a section which is equal to the difference S - B is. In practice, as mentioned, the size is this displacement a little bit less.

Da aufgrund dieser Anordnung dieser beiden Zylinder 1 und 4 der Einklemmbereich der Bahn bei der Druckoperation im wesentlichen auf die Umfangslänge B des zu druckenden Formats verkürzt und damit die druckfreie Zone auf die Länge G + (S - B) vergrössert ist, steht für das Zurückziehen der Papierbahn, das heisst für die Verzögerung und Beschleunigung, mehr Zeit zur Verfügung. Ausserdem braucht die Papierbahn nicht zusätzlich zurückgezogen zu werden, da sie sofort nach Ende des Druckbildes frei wird und verzögert werden kann. Das wesentliche ist also, dass die Papierbahn erst unmittelbar vor dem Anfang A des Druckbildes eingeklemmt und sofort nach dem Ende E des Druckbildes wieder frei wird. Das hat den Vorteil, dass bei konstanten Verzögerungs- und Beschleunigungsmomenten, die antriebsbedingt sind, durch die verlängerte druckfreie Zone die Maschinendrehzahl erhöht werden kann. Die kürzere Wiederhollänge bei kleinerem Druckbild kann daher durch eine höhere Drehzahl kompensiert werden. Je kleiner die Länge B des Druckbildes, je grösser ist die druckfreie Zone, die zum Zurückziehen des entsprechend grösseren Papierbahnabschnitts zur Verfügung steht.Since, due to this arrangement of these two cylinders 1 and 4, the pinching area of the web during the printing operation is substantially shortened to the circumferential length B of the format to be printed and thus the length of the pressure-free zone G + (S - B) is enlarged, more time is available for retracting the paper web, that is, for decelerating and accelerating. In addition, the paper web does not need to be pulled back, since it becomes free immediately after the end of the printed image and can be delayed. The essential thing is that the paper web is only clamped immediately before the start A of the printed image and is released again immediately after the end E of the printed image. This has the advantage that with constant deceleration and acceleration torques that are caused by the drive, the machine speed can be increased by the extended pressure-free zone. The shorter repetition length with a smaller print image can therefore be compensated for by a higher speed. The smaller the length B of the printed image, the larger the pressure-free zone that is available for retracting the correspondingly larger paper web section.

Ein weiterer Vorteil besteht darin, dass bei einem Druckvorgang kein zusätzlicher Papierbahnabschnitt ausserhalb des Druckbildes gepresst wird und daher eine Doppelpressung gemäss dem doppelt gepressten Abschnitt P der Papierbahn nach Figur 2, entfällt, so dass eine Beeinträchtigung der Qualität vermieden wird.Another advantage is that at no additional paper web section during a printing process is pressed outside the printed image and therefore a double pressing according to the double pressed Section P of the paper web according to FIG. 2 is omitted, see above that a deterioration in quality is avoided.

Im Beispiel nach den Figuren 3 und 4 könnte auch der Zylinder 1 der Plattenzylinder und der Zylinder 4 der Druckzylinder sein. In diesem Falle fällt der Anfang A des Druckbildes mit dem in Drehrichtung vorderen Ende des Drucksattels des Plattenzylinders zusammen, und es ist dieser Plattenzylinder, der entgegengesetzt zur Drehrichtung gegenüber dem Druckzylinder versetzt ist.In the example according to Figures 3 and 4 could also cylinder 1, plate cylinder and cylinder 4 be the impression cylinder. In this case the beginning begins A of the printed image with the front one in the direction of rotation End of the pressure saddle of the plate cylinder together, and it is this plate cylinder that is opposite offset to the direction of rotation with respect to the pressure cylinder is.

Um die beschriebenen vorteilhaften Effekte einer Versetzung der beiden zusammenwirkenden Zylinder vollständig auszunutzen, muss also das Druckbild auf einer Druckplatte entweder mit seinem Anfang A mit dem Anfang des betreffenden Drucksattels oder aber mit seinem Ende E mit dem Ende des betreffenden Drucksattels zusammenfallen. To the beneficial effects described one Relocation of the two interacting cylinders completely To exploit, the print image must be on a Printing plate either with its beginning A with the beginning of the pressure saddle in question or with its end E coincide with the end of the pressure saddle in question.

Beim dargestellten Ausführungsbeispiel nach den Figuren 3 und 4 kann es sich auch um ein Offsetdruckwerk mit zwei zusammenwirkenden Gummizylindern handeln, mit denen entweder bei Einfärbung nur eines Gummizylinders ein einseitiger Offsetdruck oder bei Einfärbung beider Gummizylinder ein Schön- und Widerdruck herstellbar ist. Alle vorstehend erwähnten Vorteile gelten auch für ein derartiges Offsetdruckwerk.In the illustrated embodiment according to the Figures 3 and 4 can also be an offset printing unit trade with two interacting rubber cylinders, with which either only one rubber cylinder is colored a one-sided offset printing or with coloring both blanket cylinders a perfect print can be produced. All the advantages mentioned above also apply to such an offset printing unit.

Die Länge D und die Winkelposition der Druckzone lassen sich automatisch ermitteln. Dazu wird im Beispiel nach den Figuren 3 und 4 am Umfang des Druckzylinders 1 ein Auslöseorgan K so befestigt, dass es sich genau dann an einem fest installierten Initiator oder Sensor I, welcher auf dieses Organ anspricht, vorbeibewegt, wenn der Beginn der Druckzone, also der Anfang A des Druckbildes, die Verbindungslinie zwischen den Achsen beider Zylinder 1 und 4 passiert; diese Stellung ist in Figur 3 dargestellt. Durch das Ansprechen des Sensors I wird ein Signal erzeugt, das in einem Zähler, der durch einen am Plattenzylinder 5 befestigten Drehgeber in Form eines Impulsgebers gesteuert wird, einen Zählerstand festhält und diesen speichert. Am Plattenzylinder 5 ist ebenfalls ein Auslöseorgan L so befestigt, dass es genau in dem Augenblick einen fest installierten Initiator oder Sensor M passiert, wenn das Ende der Druckzone des Plattenzylinders, also das Ende E des Druckbildes, die erwähnte Verbindungslinie passiert; diese Stellung ist in Figur 4 dargestellt. Das durch den Sensor M erzeugte Signal bewirkt die Speicherung eines zweiten Zählerstands. Die beiden erwähnten Zählerstände dienen als Bezugswerte für die Steuerung der Zugwalzen, welche die Papierbahn 7 im Pilgerschrittbetrieb bewegen. Die Differenz beider Zählerstände ist ein Mass für die tatsächlich wirksame Druckzone und die druckfreie Zone, in welcher die Papierbahn frei ist. Dieses Mass wird zur Berechnung der optimalen Verzögerung und Beschleunigung während des Pilgerschritts verwendet, durch welchen die Papierbahn zurückgezogen und wieder beschleunigt wird, um eine lückenlose Bedruckung der Bahn zu gewährleisten. Bei den Sensoren I und M kann es sich beispielsweise um induktive oder optische Sensoren handeln, wobei das Auslöseorgan K bzw. L im Falle eines induktiven Sensors z.B. ein Stahlklotz ist.The length D and the angular position of the print zone can be determined automatically. This is shown in the example according to Figures 3 and 4 on the circumference of the printing cylinder 1 a trigger member K is attached so that it then exactly at a permanently installed initiator or sensor I, which responds to this organ, moved past when the beginning of the pressure zone, i.e. the Start A of the printed image, the connecting line happens between the axes of both cylinders 1 and 4; this position is shown in Figure 3. By the If sensor I responds, a signal is generated that in a counter by a plate cylinder 5 attached encoder in the form of a pulse encoder is controlled, keeps a meter reading and this saves. On the plate cylinder 5 is also a Trigger L attached so that it is exactly in the Moment a permanently installed initiator or Sensor M happens when the end of the pressure zone of the Plate cylinder, that is the end E of the printed image, the mentioned connecting line happens; this position is shown in Figure 4. That generated by the sensor M. Signal causes a second counter reading to be saved. The two meter readings mentioned serve as Reference values for the control of the drawing rollers, which the Move paper web 7 in pilgrim step mode. The The difference between the two meter readings is a measure of the actually effective pressure zone and the pressure-free zone, in which the paper web is free. This measure will to calculate the optimal deceleration and acceleration used during the pilgrimage which the paper web retracted and accelerated again to ensure complete printing on the web to ensure. It can be the case with sensors I and M. for example inductive or optical sensors act, the trigger member K or L in the case of a inductive sensor e.g. is a steel block.

Allgemein stellen also die beiden Signale sowie die Zeitspanne zwischen beiden Signalen Messgrössen dar, die bei gegebener Drehgeschwindigkeit der Zylinder 1 und 4 die jeweilige Winkelstellung und Länge der Druckzone bestimmen.Generally speaking, the two signals as well the time span between the two signals represents the given rotational speed of the cylinder 1 and 4 the respective angular position and length of the Determine pressure zone.

Claims (1)

  1. Printing unit for a web-fed printing machine with two co-operating cylinders (1,4) which form the printing nip and which have a plurality of printing saddles (2,5) separated by non-printing grooves, for printing a web (7) running through the printing nip with variable formats adjoining one another, the web being transported at variable speed in a so-called pilgrim-step mode, and after each printing operation, when it passes a groove, being retracted and accelerated again relative to the circumference of the two cylinders (1,4) in such a way that successive printing images are lined up virtually without a gap wherein the two cylinders (1,4) are set angularly relative to one another, in respect of the position of their printing saddle (2,5) co-operating in the printing nip, depending on the format, in a manner offset by the amount of a circumferential distance which is at least approximately equal to the difference between the circumferential length (S) of a printing saddle (2,5) and the circumferential length (B) of a printing image, so that the length (D) of the impression zone, along which two printing saddles clamp the web (7) between them when they pass the printing nip, is only approximately as large as the circumferential length (B) of a printing image, characterised in that the cylinders (1,4) comprise cylinder pits (3,6), as on cylinders of a sheet printing machine, forming said grooves, that a first release member (K) is fastened on the circumference of the cylinder (1), on which the beginning of a printing saddle, with respect to the direction of rotation of the cylinder, corresponds to the beginning (A) of the printing image, and a first sensor (I) activable by this release member is installed in proximity to the circumference of this cylinder, in that a second release member (L) is fastened on the circumference of the other cylinder (4), on which the end of a printing saddle corresponds to the end (E) of the printing image, and a second sensor (M) activable by this release member is installed in proximity to the circumference of this cylinder, and in that said release members and said sensors are so arranged and designed that the first sensor (I) generates a first signal at the moment at which the beginning of a printing saddle (2) passes the connecting line between the axes of the two cylinders (1,4) and the second sensor (M) generates a signal at the moment at which the end of the printing saddle (5) co-operating with said printing saddle passes said connecting line, said signals and the time span between the two signals representing measured values for the angular position and the circumferential length of the printing zone and are used for controlling the movement of the paper web (7) in the pilgrim-step mode during the passage of an impression-free zone.
EP94810519A 1993-09-17 1994-09-08 Printing unit for a web printing machine Expired - Lifetime EP0649740B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2804/93 1993-09-17
CH280493 1993-09-17

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EP0649740B1 true EP0649740B1 (en) 1998-07-08

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JP (1) JP3464536B2 (en)
KR (1) KR100336921B1 (en)
CN (1) CN1051281C (en)
AT (1) ATE168071T1 (en)
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GB2328501B (en) * 1996-04-12 1999-12-08 Mark Baker Ventilation fans
JPH10116050A (en) * 1996-10-14 1998-05-06 Sony Corp Contour correction circuit and rgb monitor
EP1863638B1 (en) * 2005-03-30 2018-09-12 Goss International Americas, Inc. Web offset printing press with articulated tucker
EP2722179A1 (en) * 2012-10-18 2014-04-23 KBA-NotaSys SA Intaglio printing press and method of monitoring operation of the same
CN105015156B (en) * 2015-07-22 2018-06-26 河北海贺胜利印刷机械集团有限公司 Intermittent forward direction leapfrog printing machine and its control method and leapfrog draft gear
DE102016207398B3 (en) * 2015-09-09 2016-08-18 Koenig & Bauer Ag Machine arrangement for the sequential processing of a plurality of arcuate substrates each having a front side and a rear side
RU2624717C1 (en) * 2016-03-11 2017-07-05 Закрытое акционерное общество "Санкт-Петербургская Образцовая Типография" Method of tool cliche producing
CN107297947B (en) * 2017-06-26 2022-08-09 浙江炜冈科技股份有限公司 Novel intermittent offset press

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US3645203A (en) * 1969-10-02 1972-02-29 Fred M Slavic Press for web printing having intermittent paper-feeding means
FR2309337A1 (en) * 1975-04-29 1976-11-26 Seailles Tison Atel Const Meca Feed control for variable paper sizes - provides adjustment through differential without stopping printing machine using stepping motors
US4137624A (en) * 1977-10-31 1979-02-06 Amp Incorporated Apparatus for inserting wires into terminals in a connector
FR2454369A1 (en) * 1979-04-18 1980-11-14 Codimag METHOD AND DEVICE FOR CONTROLLING THE SCROLLING OF A TABLECLOTH IN A PRINTING MACHINE
EP0084939A1 (en) * 1982-01-20 1983-08-03 Rofrep Limited Method and means for printing with a variable repeat length
GB2190042B (en) * 1986-05-01 1990-11-21 Rofrep Ltd Printing of successive images onto an elongate web.

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ATE168071T1 (en) 1998-07-15
AU7290994A (en) 1995-03-30
KR950008126A (en) 1995-04-17
DE59406405D1 (en) 1998-08-13
RU94033483A (en) 1996-06-27
KR100336921B1 (en) 2002-11-27
JP3464536B2 (en) 2003-11-10
CA2117665A1 (en) 1995-03-18
CN1116986A (en) 1996-02-21
RU2114741C1 (en) 1998-07-10
CN1051281C (en) 2000-04-12
CA2117665C (en) 2006-01-10
JPH07148913A (en) 1995-06-13
EP0649740A1 (en) 1995-04-26

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