EP0649740A1 - Printing unit for a web printing machine - Google Patents
Printing unit for a web printing machine Download PDFInfo
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- EP0649740A1 EP0649740A1 EP94810519A EP94810519A EP0649740A1 EP 0649740 A1 EP0649740 A1 EP 0649740A1 EP 94810519 A EP94810519 A EP 94810519A EP 94810519 A EP94810519 A EP 94810519A EP 0649740 A1 EP0649740 A1 EP 0649740A1
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- European Patent Office
- Prior art keywords
- printing
- cylinder
- cylinders
- pressure
- 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.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F13/00—Common details of rotary presses or machines
- B41F13/02—Conveying or guiding webs through presses or machines
- B41F13/04—Conveying or guiding webs through presses or machines intermittently
Definitions
- the invention relates to a printing unit for a web printing press with two interacting cylinders forming the printing nip, which - like in a sheet-fed printing unit - have a plurality of printing saddles separated by cylinder pits, for printing on a web running through the printing nip with variable, adjoining formats, the The web is transported at a variable speed in the so-called vocational step and after each printing operation when it passes a cylinder pit it is pulled back and accelerated relative to the circumference of the two cylinders in such a way that successive print images are strung together practically without gaps.
- Printing units of this type are described in DE-31 35 696C3 and in EP-A-0 415 881. These known printing units are either offset printing units with two interacting rubber cylinders, both of which are inked with printed images and are used to produce a perfecting, or intaglio printing units with a plate cylinder which interacts with a printing cylinder.
- the use of sheet-fed printing units for printing on a continuous paper web has the advantage that the difficult and time-consuming production of plate, printing or rubber cylinders with a continuous, seamless peripheral surface can be dispensed with; instead, the cylinders, which are easier to manufacture, are used with separate pressure calipers on which the individual printing plates or printing covers can be individually clamped, adjusted and replaced without great difficulty.
- the transport of the paper web in the so-called island mode allows images that are always contiguous, without paper loss due to unprinted gaps between the images that can be produced so that the cylinder pits do not produce unprinted strips between successive printed images.
- the transport of the paper web as described in particular in EP-AO 415 881, is controlled by means of a control system in such a way that after each printing operation the paper web which is no longer jammed is first braked when it passes the aligned cylinder pits of both cylinders, then moved backwards and finally is accelerated again to operating speed before it is clamped again between the following cooperating pressure saddles of the two cylinders for the following printing operation.
- the distance by which the paper web is pulled back relative to the circumference of the two cylinders is selected so that successive print images are printed practically without gaps.
- the vocational step movement must be controlled so that the paper web after the mit step takes at least approximately the same position relative to the pressure gap between the two cylinders, that is to say inside the machine, as before the vocational step.
- one and the same printing machine can print adjacent images without gaps even with changed formats of the printed image, that is to say with shorter formats.
- the change in the printing format consists in that a printing plate of the same size is spanned with a shorter print image, so that the printing zone remains the same and is not shortened.
- the two cylinders are always adjusted to one another such that the pressure saddles, when they interact in the printing nip, are exactly opposite one another, as shown in FIGS. 1 and 2 for the two cylinders 1 and 4, which each have three pressure saddles 2 and 2 respectively 5 with the circumferential length S.
- the length D of the printing zone, along which the paper web 7 is clamped between the two cylinders is always as large as the circumferential length S of a printing saddle, regardless of the circumferential length B of the print image, that is to say from the format.
- FIG. 1 shows the beginning of a printing operation and FIG. 2 the end of this printing operation, after the cylinders have rotated in the arrow direction by an angle corresponding to the length D of the printing zone.
- the start of printing A coincides with the beginning of the image, while the end of printing E of the printing zone lies behind the end of image F by the difference distance D-B mentioned, this difference is designated by Z.
- the paper web 7 must assume a position relative to the printing nip each time it is used again, which position is offset by the length Z against the direction of travel if one wishes to obtain consecutive print images on the paper web practically without gaps, as indicated in FIG. 1 .
- the paper web If the paper web is released after the printing zone, it initially moves a little further, depending on the printing speed and the realizable delay, until it stops. This distance, which the paper web has covered, is of double importance, since it must be taken into account again when accelerating after the paper web has come to a standstill. Therefore, the paper web has to be pulled back twice this distance so that after it has accelerated again it will reach the same location at printing speed as it was before the vocationalage.
- the paper web cannot be decelerated immediately after the end of the printed image, but is transported on at printing speed before the vocational step can begin. As already mentioned, this path must also be withdrawn in the vocational step.
- FIGS. 1 and 2 illustrate the excessively pressed web section Z and the section of the double pressure P. The pressing of section Z in FIG. 1 results from the previous printing process.
- the present invention is based on the object of avoiding the disadvantages explained above and creating a printing unit in which there are no performance losses when changing to a smaller format and also no double pressing of the paper web.
- the two cylinders 1 and 4 shown in FIGS. 3 and 4 are, for example, the plate cylinder 4 and the printing cylinder 1 of an intaglio printing unit.
- the direction of rotation of the cylinders is indicated by curved arrows.
- Both cylinders have three equally large pressure saddles 2 and 5 with circumferential length S, which are arranged equidistantly along their circumference, which are separated from one another by cylinder pits 3 and 6 with circumferential length G.
- Printing covers are clamped onto the printing calipers 2 of the printing cylinder 1 and 4 intaglio printing plates are clamped onto the printing calipers 5 of the plate cylinder.
- the Print image on the printing plates has a circumferential length B which is smaller than the length S of the printing saddle 5 in question.
- the printing plates are stretched so that the end E of the printed image coincides with the rear end of the printing saddle 5 in the direction of rotation, while the start A of the printing image B is correspondingly offset from the beginning of the printing saddle 5.
- the pressure cylinder 1 is set angularly with respect to the plate cylinder 4 such that the pressure saddles 2 and 5 of the two cylinders interacting in the printing gap are offset from one another in such a way that the circumferential length D of the printing zone in which the interacting pressure saddles clamp the paper web 7 is just the format to be printed, ie the circumferential length B of the printed image, includes.
- the printing zone must of course be practically slightly longer than the printed image.
- the front end of the pressure saddle 2 of the printing cylinder 1 in the direction of rotation is offset from the front end of the pressure saddle 5 by a section which is equal to the difference S - B.
- the size of this dislocation is slightly smaller.
- 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 pressure-free zone is increased to the length G + (S - B), it means the withdrawal the paper web, that is to say for deceleration and acceleration, more time is available.
- the paper web does not need to be pulled back because it immediately re-starts The end of the printed image becomes free 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.
- Another advantage is that no additional paper web section is pressed outside of the printed image during a printing process and therefore a double pressing according to the double-pressed section P of the paper web according to FIG. 2 is omitted, so that a deterioration in quality is avoided.
- cylinder 1 could also be the plate cylinder and cylinder 4 the printing cylinder.
- the start A of the print image coincides with the front end of the printing saddle of the plate cylinder in the direction of rotation, and it is this plate cylinder which is offset in relation to the direction of rotation with respect to the printing cylinder.
- the printed image on a printing plate must either coincide with its start A with the beginning of the printing saddle in question or with its end E with the end of the printing saddle in question.
- the illustrated embodiment according to FIGS. 3 and 4 can also be an offset printing unit with two interacting rubber cylinders, with which one-sided offset printing can be produced either when only one rubber cylinder is colored, or when the two rubber cylinders are colored, a perfect and reverse print can be produced. All the advantages mentioned above also apply to such an offset printing unit.
- the length D and the angular position of the print zone can be determined automatically.
- a trigger element K is attached to the circumference of the printing cylinder 1 in such a way that it moves past a permanently installed initiator or sensor I, which responds to this element, when the start of the pressure zone, that is the beginning A of the printed image, the connecting line between the axes of both cylinders 1 and 4 passes; this position is shown in Figure 3.
- a signal is generated which, in a counter, which is controlled by a rotary encoder attached to the plate cylinder 5 in the form of a pulse encoder, records and stores a counter reading.
- a trigger element L is also attached to the plate cylinder 5 in such a way that it passes a permanently installed initiator or sensor M exactly at the moment when the end of the printing zone of the plate cylinder, that is to say the end E of the printed image, passes the mentioned connecting line; this position is shown in Figure 4.
- the signal generated by sensor M causes a second counter reading to be stored.
- the two counter readings mentioned serve as reference values for the control of the drawing rollers which move the paper web 7 in the pilgrim step mode.
- 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.
- the sensors I and M can be, for example, inductive or optical sensors, the trigger element K or L being, for example, a steel block in the case of an inductive sensor.
- the two signals and the time span between the two signals therefore represent measured variables which, given the rotational speed of the cylinders 1 and 4, determine the respective angular position and length of the pressure zone.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Rotary Presses (AREA)
- Auxiliary Devices For And Details Of Packaging Control (AREA)
- Handling Of Continuous Sheets Of Paper (AREA)
- Unwinding Webs (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Druckwerk für eine Rollendruckmaschine mit zwei zusammenwirkenden, den Druckspalt bildenden Zylindern, welche - wie bei einem Bogendruckwerk - mehrere, durch Zylindergruben getrennte Drucksättel aufweisen, zum Bedrucken einer den Druckspalt durchlaufenden Bahn mit veränderbaren, aneinander anschliessenden Formaten, wobei die Bahn mit veränderlicher Geschwindigkeit im sogannten Pilgerschritt transportiert und nach jeder Druckoperation beim Passieren einer Zylindergrube derart relativ zum Umfang der beiden Zylinder zurückgezogen und wieder beschleunigt wird, dass aufeinanderfolgende Druckbilder praktisch lückenlos aneinander gereiht werden.The invention relates to a printing unit for a web printing press with two interacting cylinders forming the printing nip, which - like in a sheet-fed printing unit - have a plurality of printing saddles separated by cylinder pits, for printing on a web running through the printing nip with variable, adjoining formats, the The web is transported at a variable speed in the so-called pilgrim step and after each printing operation when it passes a cylinder pit it is pulled back and accelerated relative to the circumference of the two cylinders in such a way that successive print images are strung together practically without gaps.
Druckwerke dieser Art 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-O 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 of this type are described in DE-31 35 696C3 and in EP-A-0 415 881. These known printing units are either offset printing units with two interacting rubber cylinders, both of which are inked with printed images and are used to produce a perfecting, or intaglio printing units with a plate cylinder which interacts with a printing cylinder. The use of sheet-fed printing units for printing on a continuous paper web has the advantage that the difficult and time-consuming production of plate, printing or rubber cylinders with a continuous, seamless peripheral surface can be dispensed with; instead, the cylinders, which are easier to manufacture, are used with separate pressure calipers on which the individual printing plates or printing covers can be individually clamped, adjusted and replaced without great difficulty. In addition, the transport of the paper web in the so-called pilgrim step mode allows images that are always contiguous, without paper loss due to unprinted gaps between the images that can be produced so that the cylinder pits do not produce unprinted strips between successive printed images. For this purpose, the transport of the paper web, as described in particular in EP-AO 415 881, is controlled by means of a control system in such a way that after each printing operation the paper web which is no longer jammed is first braked when it passes the aligned cylinder pits of both cylinders, then moved backwards and finally is accelerated again to operating speed before it is clamped again between the following cooperating pressure saddles of the two cylinders for the following printing operation. The distance by which the paper web is pulled back relative to the circumference of the two cylinders is selected so that successive print images are printed practically without gaps. For this purpose, the pilgrim step movement must be controlled so that the paper web after the pilgrim step takes at least approximately the same position relative to the pressure gap between the two cylinders, that is to say inside the machine, as before the 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 appropriately adapting the pilgrim step movement, one and the same printing machine can print adjacent images without gaps even with changed formats of the printed image, that is to say with shorter formats. The change in the printing format consists in that a printing plate of the same size is spanned with a shorter print image, so that the printing 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 of this type, the two cylinders are always adjusted to one another such that the pressure saddles, when they interact in the printing nip, are exactly opposite one another, as shown in FIGS. 1 and 2 for the two cylinders 1 and 4, which each have three pressure saddles 2 and 2 respectively 5 with the circumferential length S. Here, the length D of the printing zone, along which the paper web 7 is clamped between the two cylinders, is always as large as the circumferential length S of a printing saddle, regardless of the circumferential length B of the print image, that is to say from 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, the pressure-free zone between two pressure zones corresponding to the length G of a cylinder pit and therefore the period of time available for retracting the paper web is always the same.
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.FIG. 1 shows the beginning of a printing operation and FIG. 2 the end of this printing operation, after the cylinders have rotated in the arrow direction by an angle corresponding to the length D of the printing zone. If the maximum possible format is printed, that is to say if the circumferential length of the printed image is practically equal to the circumferential length of a printing saddle, then after each printing operation, the paper web 7 has to be braked, retracted and retracted after each printing operation, if it passes freely through the cylinder pits 3, 6 are accelerated so that, depending on the printing speed, the realizable deceleration and acceleration as well as the time in which the pit is to be passed, it assumes almost the same position, relative to the printing gap, that it had assumed before the pilgrimage step.
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.If, however, smaller formats are to be printed in which - as illustrated in FIGS. 1 and 2 - the circumferential length B of a print image is smaller than the circumferential length S of a printing saddle, then the paper web 7 must be pulled back by a greater distance after each printing operation and then accelerated again , which ensures that the position of the paper web when printing is used again is offset by the difference between the length of the printing zone D and the length of the printed image B, that is to say the distance DB, relative to the printing nip against the direction of travel.
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 printing A coincides with the beginning of the image, while the end of printing E of the printing zone lies behind the end of image F by the difference distance D-B mentioned, this difference is designated by Z. In this case, the paper web 7 must assume a position relative to the printing nip each time it is used again, which position is offset by the length Z against the direction of travel if one wishes to obtain consecutive print images on the paper web practically without gaps, as indicated in FIG. 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 print zone always remains constant, even when producing print images of smaller format, has several 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 :Since the paper web has to be pulled back by a distance Z after each printing operation, for smaller formats, that is to say for larger Z, this means a considerably greater delay and acceleration of the paper web compared to the printing operation in which the maximum printing format is produced. The following must be taken into account:
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 a little further, depending on the printing speed and the realizable delay, until it stops. This distance, which the paper web has covered, is of double importance, since it must be taken into account again when accelerating after the paper web has come to a standstill. Therefore, the paper web has to be pulled back twice this distance so that after it has accelerated again it will reach the same location at printing speed as it was before the pilgrimage.
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.If the length of the printing saddle is longer than the length of the printed image, the paper web cannot be decelerated immediately after the end of the printed image, but is transported on at printing speed before the pilgrimage step can begin. As already mentioned, this path must also be 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 are limited, it is necessary to reduce the speed of the machine. This loss of performance therefore has a double effect, since a shorter print image is generated per revolution and the speed must also 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, especially in intaglio printing, the paper web is compressed in such a way by the very high pressure, which can be up to 80 t per meter of web width, and the high-gloss chrome-plated surface of the printing plate that, after the section Z of the paper web has been pressed but not printed with color, when it is pulled back following printing process is printed with poorer quality than the non-pressed web. FIGS. 1 and 2 illustrate the excessively pressed web section Z and the section of the double pressure P. The pressing of section Z in FIG. 1 results from the previous printing process.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, die vorstehend erläuterten Nachteile zu vermeiden und ein Druckwerk zu schaffen, bei welchem keine Leistungsverluste bei Uebergang zu einem kleineren Format und auch keine Doppelpressungen der Papierbahn auftreten.The present invention is based on the object of avoiding the disadvantages explained above and creating a printing unit in which there are no performance losses when changing to a smaller format and also no double pressing of the paper web.
Diese Aufgabe wird erfindungsgemäss durch die im Kennzeichen des Anspruchs 1 angegebenen Merkmale gelöst.According to the invention, this object is achieved by the features specified in the characterizing part of claim 1.
Die Erfindung wird anhand der Zeichnungen an einem Ausführungsbeispiel näher erläutert.
- Die Figuren 1 und 2 veranschaulichen, wie bereits erwähnt, den Druckbetrieb eines bekannten Bogendruckwerks beim Bedrucken einer Papierbahn, die im Pilgerschritt transportiert wird und
- 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.
- As already mentioned, FIGS. 1 and 2 illustrate the printing operation of a known sheet-fed printing unit when printing on a paper web which is transported in the pilgrim step and
- Figures 3 and 4 illustrate a printing unit according to the invention and its operation, wherein Figure 3 shows the start of a printing operation and Figure 4 shows the end of this printing operation after both cylinders have rotated through an angle corresponding to the printing zones D.
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.The two cylinders 1 and 4 shown in FIGS. 3 and 4 are, for example, the plate cylinder 4 and the printing cylinder 1 of an intaglio printing unit. The direction of rotation of the cylinders is indicated by curved arrows. Both cylinders have three equally large pressure saddles 2 and 5 with circumferential length S, which are arranged equidistantly along their circumference, which are separated from one another by cylinder pits 3 and 6 with circumferential length G. Printing covers are clamped onto the printing calipers 2 of the printing cylinder 1 and 4 intaglio printing plates are clamped onto the printing calipers 5 of the plate cylinder. The Print image on the printing plates has a circumferential length B which is smaller than the length S of the printing saddle 5 in question.
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 under consideration, the printing plates are stretched so that the end E of the printed image coincides with the rear end of the printing saddle 5 in the direction of rotation, while the start A of the printing image B is correspondingly offset from the beginning of the printing saddle 5. As shown, the pressure cylinder 1 is set angularly with respect to the plate cylinder 4 such that the pressure saddles 2 and 5 of the two cylinders interacting in the printing gap are offset from one another in such a way that the circumferential length D of the printing zone in which the interacting pressure saddles clamp the paper web 7 is just the format to be printed, ie the circumferential length B of the printed image, includes. Taking into account the free edges of the printed images applied to the paper web, the printing zone must of course be practically 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, the front end of the pressure saddle 2 of the printing cylinder 1 in the direction of rotation is offset from the front end of the pressure saddle 5 by a section which is equal to the difference S - B. In practice, as mentioned, the size of this dislocation is slightly smaller.
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 pressure-free zone is increased to the length G + (S - B), it means the withdrawal the paper web, that is to say for deceleration and acceleration, more time is available. In addition, the paper web does not need to be pulled back because it immediately re-starts The end of the printed image becomes free 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 no additional paper web section is pressed outside of the printed image during a printing process and therefore a double pressing according to the double-pressed section P of the paper web according to FIG. 2 is omitted, so 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 FIGS. 3 and 4, cylinder 1 could also be the plate cylinder and cylinder 4 the printing cylinder. In this case, the start A of the print image coincides with the front end of the printing saddle of the plate cylinder in the direction of rotation, and it is this plate cylinder which is offset in relation to the direction of rotation with respect to the printing cylinder.
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.In order to take full advantage of the described advantageous effects of a displacement of the two interacting cylinders, the printed image on a printing plate must either coincide with its start A with the beginning of the printing saddle in question or with its end E with the end of the printing 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.The illustrated embodiment according to FIGS. 3 and 4 can also be an offset printing unit with two interacting rubber cylinders, with which one-sided offset printing can be produced either when only one rubber cylinder is colored, or when the two rubber cylinders are colored, a perfect and reverse 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. For this purpose, in the example according to FIGS. 3 and 4, a trigger element K is attached to the circumference of the printing cylinder 1 in such a way that it moves past a permanently installed initiator or sensor I, which responds to this element, when the start of the pressure zone, that is the beginning A of the printed image, the connecting line between the axes of both cylinders 1 and 4 passes; this position is shown in Figure 3. By responding to the sensor I, a signal is generated which, in a counter, which is controlled by a rotary encoder attached to the plate cylinder 5 in the form of a pulse encoder, records and stores a counter reading. A trigger element L is also attached to the plate cylinder 5 in such a way that it passes a permanently installed initiator or sensor M exactly at the moment when the end of the printing zone of the plate cylinder, that is to say the end E of the printed image, passes the mentioned connecting line; this position is shown in Figure 4. The signal generated by sensor M causes a second counter reading to be stored. The two counter readings mentioned serve as reference values for the control of the drawing rollers which move the paper web 7 in the pilgrim step mode. 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 is used to calculate the optimum deceleration and acceleration during the pilgrimage step, by means of which the paper web is pulled back and accelerated again, in order to ensure a seamless printing of the web. The sensors I and M can be, for example, inductive or optical sensors, the trigger element K or L being, for example, a steel block in the case of an inductive sensor.
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.In general, the two signals and the time span between the two signals therefore represent measured variables which, given the rotational speed of the cylinders 1 and 4, determine the respective angular position and length of the pressure zone.
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH280493 | 1993-09-17 | ||
| CH2804/93 | 1993-09-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0649740A1 true EP0649740A1 (en) | 1995-04-26 |
| EP0649740B1 EP0649740B1 (en) | 1998-07-08 |
Family
ID=4241967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94810519A Expired - Lifetime EP0649740B1 (en) | 1993-09-17 | 1994-09-08 | Printing unit for a web printing machine |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0649740B1 (en) |
| JP (1) | JP3464536B2 (en) |
| KR (1) | KR100336921B1 (en) |
| CN (1) | CN1051281C (en) |
| AT (1) | ATE168071T1 (en) |
| AU (1) | AU7290994A (en) |
| CA (1) | CA2117665C (en) |
| DE (1) | DE59406405D1 (en) |
| RU (1) | RU2114741C1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2328501A (en) * | 1996-04-12 | 1999-02-24 | Mark Baker | Ventilation fans |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10116050A (en) * | 1996-10-14 | 1998-05-06 | Sony Corp | Contour correction circuit and rgb monitor |
| JP4740314B2 (en) * | 2005-03-30 | 2011-08-03 | ゴス インターナショナル アメリカス インコーポレイテッド | Web offset printing machine with pivoted tacker |
| 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 |
| CN108002013B (en) * | 2017-12-22 | 2024-05-24 | 宜宾丝丽雅股份有限公司 | Viscose filament yarn feeding device |
| CN108327387B (en) * | 2018-03-22 | 2024-04-26 | 东莞市鸿程机械有限公司 | Drum-type meshbelt polychrome lithography apparatus |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| EP0018291A1 (en) * | 1979-04-18 | 1980-10-29 | Codimag | Variable format printing machine |
| EP0084939A1 (en) * | 1982-01-20 | 1983-08-03 | Rofrep Limited | Method and means for printing with a variable repeat length |
| EP0251448A2 (en) * | 1986-05-01 | 1988-01-07 | Synpro Machine Initiative Limited | Web printing machine with variable repeat distance |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4137624A (en) * | 1977-10-31 | 1979-02-06 | Amp Incorporated | Apparatus for inserting wires into terminals in a connector |
-
1994
- 1994-09-08 EP EP94810519A patent/EP0649740B1/en not_active Expired - Lifetime
- 1994-09-08 CA CA002117665A patent/CA2117665C/en not_active Expired - Fee Related
- 1994-09-08 DE DE59406405T patent/DE59406405D1/en not_active Expired - Fee Related
- 1994-09-08 AT AT94810519T patent/ATE168071T1/en not_active IP Right Cessation
- 1994-09-12 AU AU72909/94A patent/AU7290994A/en not_active Abandoned
- 1994-09-15 CN CN94116304A patent/CN1051281C/en not_active Expired - Fee Related
- 1994-09-16 KR KR1019940023576A patent/KR100336921B1/en not_active IP Right Cessation
- 1994-09-16 RU RU94033483A patent/RU2114741C1/en not_active IP Right Cessation
- 1994-09-16 JP JP22175894A patent/JP3464536B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| EP0018291A1 (en) * | 1979-04-18 | 1980-10-29 | Codimag | Variable format printing machine |
| EP0084939A1 (en) * | 1982-01-20 | 1983-08-03 | Rofrep Limited | Method and means for printing with a variable repeat length |
| EP0251448A2 (en) * | 1986-05-01 | 1988-01-07 | Synpro Machine Initiative Limited | Web printing machine with variable repeat distance |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2328501A (en) * | 1996-04-12 | 1999-02-24 | Mark Baker | Ventilation fans |
| GB2328501B (en) * | 1996-04-12 | 1999-12-08 | Mark Baker | Ventilation fans |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100336921B1 (en) | 2002-11-27 |
| DE59406405D1 (en) | 1998-08-13 |
| ATE168071T1 (en) | 1998-07-15 |
| CN1051281C (en) | 2000-04-12 |
| KR950008126A (en) | 1995-04-17 |
| AU7290994A (en) | 1995-03-30 |
| CA2117665C (en) | 2006-01-10 |
| CA2117665A1 (en) | 1995-03-18 |
| RU2114741C1 (en) | 1998-07-10 |
| JPH07148913A (en) | 1995-06-13 |
| JP3464536B2 (en) | 2003-11-10 |
| CN1116986A (en) | 1996-02-21 |
| EP0649740B1 (en) | 1998-07-08 |
| RU94033483A (en) | 1996-06-27 |
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