EP0703077B1 - Device for preventing damage in a printing machine - Google Patents

Device for preventing damage in a printing machine Download PDF

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Publication number
EP0703077B1
EP0703077B1 EP95113880A EP95113880A EP0703077B1 EP 0703077 B1 EP0703077 B1 EP 0703077B1 EP 95113880 A EP95113880 A EP 95113880A EP 95113880 A EP95113880 A EP 95113880A EP 0703077 B1 EP0703077 B1 EP 0703077B1
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EP
European Patent Office
Prior art keywords
web
severing
halting
catching
dryer
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Expired - Lifetime
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EP95113880A
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German (de)
French (fr)
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EP0703077A1 (en
Inventor
Werner J. Kotterer
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Baldwin Grafotec GmbH
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Baldwin Grafotec GmbH
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Publication of EP0703077A1 publication Critical patent/EP0703077A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F33/00Indicating, counting, warning, control or safety devices
    • B41F33/18Web break detection

Definitions

  • the invention relates to a device for preventing damage to a dryer Web-fed rotary printing press through a web break.
  • Separating and holding devices are also known which the printing material web between the printing units and the Cut through the dryer and then pinch it. This will a disturbing influence of the strand in the dryer the printing material web switched off. Winder in the area of the last printing unit are accepted, because there is only that between the printing units Can wind the strand in one layer. At high However, machine speeds result in one Winding thickness that can lead to machine damage.
  • the invention has for its object a To create facility with which even at high-speed Printing presses with long dryers damage the Printing units effective if the printing material web breaks is prevented.
  • this is achieved in that a Web catching device, and a downstream in the web running direction Separating and holding device between the last printing unit and the dryer are arranged, as well one after the other the web safety device and the separating and Holding device for functioning web break detector are provided.
  • the web catching device When using the invention, the web catching device the strand in the printing unit Printing material web wound on the take-up roller.
  • the winding roller turns it into a dryer leading strand tightened in the short term, so that in this State of the one in operation with little time delay cutting means of the separating and holding device can be cut cleanly across the length of the web.
  • the short anyway, between the take-up roller and the Separating and holding device located strand Printing material web therefore has no oblique tear edge, the further winding of the from the printing units coming dreams can pull this one-sided stronger, which creates a risk of tearing, particularly in the area of the Einzugwerkes avoided.
  • the separating and Holding device not only ensures that from no web parts can be pulled out from the dryer, but that the strand in the dryer is not, e.g. through the blow nozzles, transported into the dryer becomes. The dryer must therefore be removed to remove this strand cannot be opened.
  • the web break detector is preferably the printing material web non-contact scanning sensor, the one that Web safety device and with a slight time delay Separating and holding device in function Control unit controls. This allows very short Response times of the device according to the invention achieve.
  • the Control unit a time delay element for control the separating and holding device.
  • a time delay element for control the separating and holding device.
  • the web catching device advantageously has a means a motor with a speed above the web running speed lying peripheral speed driven Take-up roller. With this measure it becomes Feeder leading strand of the substrate in Moment of device response in the short term streamlined so that despite opening the Printing unit cylinder and the resulting tendency of the strand can be wound up without wrinkles for fluttering can. This measure supports at the same time Tighten the strand leading to the dryer and thus one clean cut through the separating and holding device.
  • the control unit shows a the peripheral speed of the Take-up roller after grasping the printing material web on the Web running speed slowing control member. This will result from the enlargement of the Winding diameter of the winding roller caused Acceleration of that between the printing units Avoid runs of the substrate that lead to a could cause further crack.
  • the offset roll rotary printing machine has a feed unit 1, several printing units 2 and one Dryer 3 on.
  • the arrangement is such that a substrate 4 straight in the direction of Arrow a through the printing units 2 and the dryer 3 goes through.
  • Between the last printing unit 2 and the Dryers 3 are generally designated 5 Web catching device and a total designated 6 Separating and holding device arranged.
  • the Separating and holding device 6 in the web running direction a Web catching device 5 downstream.
  • the two Devices 5 and 6 are expediently direct to one another arranged adjacent, so that between them only a short piece of the substrate 4 is located.
  • the web safety device 5 and the separating and Holding device 6 in the embodiment of a structural unit summarized.
  • the invention can also applied to other types of presses.
  • the web catching device has 5 a take-up roller 7, which in the in FIG shown provision the substrate web not touched.
  • the take-up roller 7 is not one illustrated drive gear chain having gears by means of a motor 8, for example an electric geared motor, driven.
  • the web safety device also has a swivel frame 9 which is about a fixed axis 10 is pivotable.
  • the swivel frame 9 takes an axis 11 around which loosely rotatable one Counter-pressure roller 12 is mounted.
  • one Back pressure roller can also have multiple back pressure rollers the axis 11 be mounted.
  • the swivel frame 9 In the resting position of the Web safety device 5 is the swivel frame 9 under the Effect of a spring, not shown, on one Lock pin 13 of a trigger device 14, for example an electromagnet or a hydraulic or Pneumatic cylinder, on. If the locking pin 13 withdrawn, the swivel frame 9 can in the direction of arrow b and swivel the substrate 4 press on the take-up roller 7.
  • webbing safety device can also be any other known safety device find use.
  • Knife bar 15 Knife bar 15 with a knife 16 and -on the Dryer facing side - a terminal block 17.
  • a walking beam 18 is movable in the direction of arrow c arranged. This carries one on its top Bracket 19, which can be cut with the knife 16 cooperates, and a clamping surface 20, between which and the terminal strip 17, the path 4 can be set.
  • the separating and holding device 6 shown can also be another known separation and holding device Find the use of the substrate separates and holds the strand leading to the dryer.
  • a web break detector 21 provided that in the embodiment as the printing substrate 4 non-contact scanning sensor is.
  • the web break detector 21 is useful between the Separating and holding device 6 and the dryer 3 arranged.
  • the web break detector 21 gives in the case of a Web break a trigger signal to a control unit 22.
  • This control unit 22 has a microprocessor 23, the one in the case of one released by the web break detector Triggering signal activates the triggering device 14, so that the locking pin 13 is withdrawn.
  • the swivel frame 9 pivot in the direction of arrow b and thereby on the counter-pressure roller 12 Press the printing material web 4 onto the take-up roller 7. It can by a rod-shaped deflector 25 on Swivel frame 9, the printing material web 4 in one comparatively large loop area to the Winding roller 7 are brought up.
  • the winding roller 7 is shown Embodiment by means of the motor 8 with a Peripheral speed driven above the Running speed of the substrate 4 during the Pressure, for example, this speed Exceeds 15%.
  • the web safety device by pressing the Printing material web 4 by means of the counter-pressure roller 12 to the The winding roller 7 starts the microprocessor 23 Speed of the motor 8 and thus the take-up roller 7 too reduce to a level that the respective Web running speed of the now not driven Printing material web 4 taking into account the through the winding increasing the winding diameter of the Roller 7 determined.
  • the web catching device 5 thus exercises the phase of increased peripheral speed of the Winding roller 7 when the web catching device responds 5 no further acceleration onto the substrate 4 off, so that there is no danger that the Winding roller 7 caused another web break.
  • the control device 22 also has a Time delay element 24 on that with a low time delay the separating and holding device 6 controls.
  • a Time delay element 24 on that with a low time delay the separating and holding device 6 controls.
  • the low time delay with which the separation and Holding device 6 comes into play it is ensured that the printing material web is secure from the take-up roller 7 is taken and this one of the web running direction a opposite train to that in the dryer 3 Run the substrate 4 can exercise.
  • the substrate web 4 is therefore clamped in the area of the knife 16, which creates an exact cut across the direction of travel the printing material web 4 can achieve.
  • the one Release of the web catching device 5 between the winding roller 7 and the platen roller 12 and the knife 16 located short part of the substrate 4 can as a result of the perpendicular to the web running direction Cut when winding on the winding roller 7 none cause increased winding diameter on one side, which leads to an uneven pull across the width of the in the printing units 2 run of the substrate web 4 could result.
  • the danger of another crack of the Printing material web 4 in the area of the feed mechanism is therefore avoided.
  • a time delay element 24 can also a separation and holding device 6 use find whose responsiveness is so great that the The printing material web 4 is cut only when the winding roller 7 the printing material web 4 with a has gripped such a peripheral area that another Winding is secured.

Description

Die Erfindung betrifft eine Einrichtung zum Verhindern von Schäden an einer einen Trockner umfassenden Rollenrotationsdruckmaschine durch einen Bahnriß.The invention relates to a device for preventing damage to a dryer Web-fed rotary printing press through a web break.

Es sind zwischen dem letzten Druckwerk und dem Trockner angeordnete Bahnfangvorrichtungen bekannt, bei denen die Bedruckstoffbahn im Falle eines Risses auf eine Aufwickelwalze aufgewickelt wird. Da die Bedruckstoffbahn in der Regel im Trockner reißt, wird auf die Aufwickelwalze sowohl das zwischen den Druckwerken befindliche Trum als auch das im Trockner befindliche Trum aufgewickelt. Das aus dem Trockner zurückkommende Trum der Bedruckstoffbahn ist insbesondere bei schnellaufenden Druckmaschinen mit langen Trocknern häufig zerknäult. Dies führt über die Breite der Aufwickelwalze zu ungleichen Wickeldurchmessern. Hieraus resultiert ein einseitiger Zug der Bahnfangvorrichtung auf das Trum der Bedruckstoffbahn, das sich zwischen dem Einzugswerk und der Bahnfangvorrichtung befindet. Bei einseitigem Zug der Bahnfangvorrichtung besteht jedoch eine große Rißgefahr im Bereich dieses Trums, weil es auf der Seite mit weniger Zug zu einer lockeren Schlaufe kommen kann, was eine Wicklergefahr und damit eine Rißgefahr im Einzugswerk ergibt. In jedem Falle ist der Riß ein unsauberer Riß. Es besteht daher zusätzlich die Gefahr, daß der beim Riß entstehende Schwanz des von der Bahnfangvorrichtung erfaßtem Trums an einem Druckmaschinenzylinder anschlägt. Hierbei werden kleine Papierfetzen abgerissen, die zu Verunreinigungen führen. Wenn weiterhin die Zerknäulung des vom Trockner zurückgeholten Trums so groß ist, daß dieses Knäuel die Bahnfangvorrichtung an ihrer engsten Stelle sperrt, muß der Motor der Bahnfangvorrichtung mit erhöhtem Drehmoment ziehen. Die Folge davon ist, daß die Geschwindigkeit absinkt. Wenn die Wickelgeschwindigkeit der Aufwickelwalze kleiner als die Geschwindigkeit des vom Einzugswerk abgegebenen Trums der Bedruckstoffbahn ist, kommt es zu einer Sackbildung, die zu einem Wickler im Bereich des letzten Druckwerkes und dann zu einem weiteren Bahnriß führen kann.It is between the last printing unit and the dryer arranged web catching devices known in which the Printing material web in the event of a tear on one Winding roller is wound up. Because the substrate usually tears in the dryer, is on the take-up roller both that between the printing units located strand as well as the one located in the dryer Run wound up. The one coming back from the dryer Run of the printing material web is in particular at high-speed printing machines with long dryers often scrunched up. This leads across the breadth of the Winding roller with unequal winding diameters. Out of this this results in a one-sided pull of the web catching device on the run of the printing material web, which lies between the Feed mechanism and the web safety device is located. At unilateral train of the web safety device exists a great risk of tearing in the area of this strand because it is on the side with less pull to a loose loop can come what a winder danger and therefore a There is a risk of cracking in the feed mechanism. In any case it is Crack an unclean crack. There is therefore also the Danger that the tail of the Web catching device detected strand on a printing press cylinder strikes. Here are small Torn pieces of paper that lead to contamination. If the crumpling continues from the dryer fetched back is so large that this tangle of Restricts the web safety gear at its narrowest point the motor of the safety gear with increased torque pull. The consequence of this is that the speed sinks. If the winding speed of the Take-up roller less than the speed of the Infeed unit of the run of the printing material web, there is a bag formation, which leads to a winder in the Area of the last printing unit and then to one can lead to further web break.

Es sind auch schon Trenn- und Haltevorrichtungen bekannt, die die Bedruckstoffbahn zwischen den Druckwerken und dem Trockner durchtrennen und dann einklemmen. Hierdurch wird ein störender Einfluß des im Trockner befindlichen Trums der Bedruckstoffbahn ausgeschaltet. Wickler im Bereich des letzten Druckwerkes werden dabei in Kauf genommen, da sich hier nur das zwischen den Druckwerken befindliche Trum einlagig aufwickeln kann. Bei hohen Maschinengeschwindigkeiten ergibt sich aber dennoch eine Wicklungsdicke, die zu Maschinenschäden führen kann.Separating and holding devices are also known which the printing material web between the printing units and the Cut through the dryer and then pinch it. This will a disturbing influence of the strand in the dryer the printing material web switched off. Winder in the area of the last printing unit are accepted, because there is only that between the printing units Can wind the strand in one layer. At high However, machine speeds result in one Winding thickness that can lead to machine damage.

Der Erfindung liegt die Aufgabe zugrunde, eine Einrichtung zu schaffen, mit der auch bei schnellaufenden Druckmaschinen mit langen Trocknern eine Beschädigung der Druckwerke bei einem Riß der Bedruckstoffbahn wirksam verhindert wird.The invention has for its object a To create facility with which even at high-speed Printing presses with long dryers damage the Printing units effective if the printing material web breaks is prevented.

Erfindungsgemäß wird dies dadurch erreicht, daß eine Bahnfangvorrichtung, und eine in Bahnlaufrichtung nachgeschaltete Trenn- und Haltevorrichtung, die zwischen dem letzten Druckwerk und dem Trockner angeordnet sind, sowie ein nacheinander die Bahnfangvorrichtung und die Trenn- und Haltevorrichtung in Funktion bringender Bahnrißmelder vorgesehen sind.According to the invention this is achieved in that a Web catching device, and a downstream in the web running direction Separating and holding device between the last printing unit and the dryer are arranged, as well one after the other the web safety device and the separating and Holding device for functioning web break detector are provided.

Bei Anwendung der Erfindung wird durch die Bahnfangvorrichtung das im Druckwerk befindliche Trum der Bedruckstoffbahn auf die Aufwickelwalze aufgewickelt. Dabei wird durch die Aufwickelwalze das zum Trockner führende Trum kurzfristig gestrafft, sodaß es in diesem Zustand von dem mit geringer Zeitverzögerung in Funktion tretenden Schneidmitteln der Trenn- und Haltevorrichtung sauber quer zur Bahnlängsrichtung abgetrennt werden kann. Das ohnehin kurze, zwischen der Aufwickelwalze und der Trenn- und Haltevorrichtung befindliche Trum der Bedruckstoffbahn weist daher keine schräge Rißkante auf, die beim weiteren Aufwickeln des aus den Druckwerken kommenden Trums dieses einseitig stärker ziehen kann, womit eine Rißgefahr insbesondere im Bereich des Einzugswerkes vermieden ist. Die Trenn- und Haltevorrichtung stellt dabei nicht nur sicher, daß aus dem Trockner keine Bahnteile herausgezogen werden können, sondern daß das im Trockner befindliche Trum nicht, z.B. durch die Blasdüsen, in den Trockner hineintransportiert wird. Zur Entnahme dieses Trums muß der Trockner daher nicht geöffnet werden.When using the invention, the web catching device the strand in the printing unit Printing material web wound on the take-up roller. The winding roller turns it into a dryer leading strand tightened in the short term, so that in this State of the one in operation with little time delay cutting means of the separating and holding device can be cut cleanly across the length of the web. The short anyway, between the take-up roller and the Separating and holding device located strand Printing material web therefore has no oblique tear edge, the further winding of the from the printing units coming dreams can pull this one-sided stronger, which creates a risk of tearing, particularly in the area of the Einzugwerkes avoided. The separating and Holding device not only ensures that from no web parts can be pulled out from the dryer, but that the strand in the dryer is not, e.g. through the blow nozzles, transported into the dryer becomes. The dryer must therefore be removed to remove this strand cannot be opened.

Vorzugsweise ist der Bahnrißmelder ein die Bedruckstoffbahn berührungslos abtastender Sensor, der eine die Bahnfangvorrichtung und mit geringer Zeitverzögerung die Trenn- und Haltevorrichtung in Funktion bringende Steuereinheit ansteuert. Hierdurch lassen sich sehr kurze Ansprechzeiten der erfindungsgemäßen Einrichtung erzielen.The web break detector is preferably the printing material web non-contact scanning sensor, the one that Web safety device and with a slight time delay Separating and holding device in function Control unit controls. This allows very short Response times of the device according to the invention achieve.

Nach einer Ausgestaltung der Erfindung weist die Steuereinheit ein Zeitverzögerungsglied zur Ansteuerung der Trenn- und Haltevorrichtung auf. Nach einer alternativen Ausgestaltung der Erfindung wird eine aufgrund der Ansprechträgheit verzögert in Funktion tretende Trenn- und Haltevorrichtung verwendet. According to one embodiment of the invention, the Control unit a time delay element for control the separating and holding device. After a alternative embodiment of the invention is a Delayed in function due to the inertia separating and holding device used.

Vorteilhaft weist die Bahnfangvorrichtung eine mittels eines Motors mit einer über der Bahnlaufgeschwindigkeit liegenden Umfangsgeschwindigkeit angetriebene Aufwickelwalze auf. Durch diese Maßnahme wird das zum Einzugswerk führende Trum der Bedruckstoffbahn im Augenblick des Ansprechens der Vorrichtung kurzfristig gestrafft, sodaß es trotz des Öffnens der Druckwerkszylinder und der damit hervorgerufenen Tendenz des Trums zum Flattern faltenlos aufgewickelt werden kann. Diese Maßnahme unterstützt gleichzeitig ein Straffen des zum Trockner führenden Trums und damit einen sauberen Schnitt durch die Trenn- und Haltevorrichtung.The web catching device advantageously has a means a motor with a speed above the web running speed lying peripheral speed driven Take-up roller. With this measure it becomes Feeder leading strand of the substrate in Moment of device response in the short term streamlined so that despite opening the Printing unit cylinder and the resulting tendency of the strand can be wound up without wrinkles for fluttering can. This measure supports at the same time Tighten the strand leading to the dryer and thus one clean cut through the separating and holding device.

Gemäß einer weiteren Ausgestaltung der Erfindung ist die Drehzahl des Motors stufenlos regelbar; die Steuereinheit weist dann ein die Umfangsgeschwindigkeit der Aufwickelwalze nach Erfassen der Bedruckstoffbahn auf die Bahnlaufgeschwindigkeit verlangsamendes Steuerglied auf. Hierdurch wird eine infolge der Vergrößerung des Aufwickeldurchmessers der Aufwickelwalze hervorgerufene Beschleunigung des zwischen den Druckwerken befindlichen Trums der Bedruckstoffbahn vermieden, die zu einem weiteren Riß führen könnte.According to a further embodiment of the invention Motor speed infinitely adjustable; the control unit then shows a the peripheral speed of the Take-up roller after grasping the printing material web on the Web running speed slowing control member. This will result from the enlargement of the Winding diameter of the winding roller caused Acceleration of that between the printing units Avoid runs of the substrate that lead to a could cause further crack.

Weitere Merkmale und Vorteile ergeben sich aus den zusätzlichen Unteransprüchen und der Beschreibung eines Ausführungsbeispieles anhand der Zeichnung. Auf dieser zeigt jeweils in einer schematischen Seitenansicht die

  • Figur 1 eine Offsetrollenrotationsdruckmaschine und
  • Figur 2 die erfindungsgemäße Einrichtung in vergrößertem Maßstab.
  • Further features and advantages result from the additional subclaims and the description of an exemplary embodiment with reference to the drawing. This shows in a schematic side view
  • 1 shows an offset roll rotary printing machine and
  • Figure 2 shows the device according to the invention on an enlarged scale.
  • Die Offsetrollenrotationsdruckmaschine gemäß Figur 1 weist ein Einzugswerk 1, mehrere Druckwerke 2 und einen Trockner 3 auf. Die Anordnung ist dabei so getroffen, daß eine Bedruckstoffbahn 4 geradlinig in Richtung des Pfeiles a durch die Druckwerke 2 und den Trockner 3 durchläuft. Zwischen dem letzten Druckwerk 2 und dem Trockner 3 sind eine insgesamt mit 5 bezeichnete Bahnfangvorrichtung und eine insgesamt mit 6 bezeichnete Trenn- und Haltevorrichtung angeordnet. Dabei ist die Trenn- und Haltevorrichtung 6 in Bahnlaufrichtung a der Bahnfangvorrichtung 5 nachgeschaltet. Die beiden Vorrichtungen 5 und 6 sind zweckmäßig einander unmittelbar benachbart angeordnet, so daß sich zwischen ihnen nur ein kurzes Stück der Bedruckstoffbahn 4 befindet. Aus Gründen einer einfachen Montage an der Druckmaschine sind die Bahnfangvorrichtung 5 und die Trenn- und Haltevorrichtung 6 beim Ausführungsbeispiel zu einer Baueinheit zusammengefaßt. Die Erfindung kann jedoch auch bei anderen Druckmaschinentypen angewendet werden. The offset roll rotary printing machine according to FIG. 1 has a feed unit 1, several printing units 2 and one Dryer 3 on. The arrangement is such that a substrate 4 straight in the direction of Arrow a through the printing units 2 and the dryer 3 goes through. Between the last printing unit 2 and the Dryers 3 are generally designated 5 Web catching device and a total designated 6 Separating and holding device arranged. Here is the Separating and holding device 6 in the web running direction a Web catching device 5 downstream. The two Devices 5 and 6 are expediently direct to one another arranged adjacent, so that between them only a short piece of the substrate 4 is located. Out For reasons of simple mounting on the printing press the web safety device 5 and the separating and Holding device 6 in the embodiment of a structural unit summarized. However, the invention can also applied to other types of presses.

    Wie Figur 2 erkennen läßt, weist die Bahnfangvorrichtung 5 eine Aufwickelwalze 7 auf, die in der in Figur 2 dargestellten Rückstellung die Bedruckstoffbahn nicht berührt. Die Aufwickelwalze 7 ist über eine nicht dargestellte, Zahnräder aufweisende Antriebsgetriebekette mittels eines Motors 8, beispielsweise eines Elektrogetriebemotors, angetrieben. Die Bahnfangvorrichtung weist weiterhin einen Schwenkrahmen 9 auf, der um eine feste Achse 10 schwenkbar ist. Der Schwenkrahmen 9 nimmt eine Achse 11 auf, um die lose drehbar eine Gegendruckwalze 12 gelagert ist. Anstelle einer Gegendruckwalze können auch mehrere Gegendruckrollen auf der Achse 11 gelagert sein. In der Ruhestellung der Bahnfangvorrichtung 5 liegt der Schwenkrahmen 9 unter der Wirkung einer nicht dargestellten Feder an einem Sperrstift 13 einer Auslöseeinrichtung 14, beispielsweise eines Elektromagneten oder eines Hydraulik- oder Pneumatikzylinders, an. Wird der Sperrstift 13 zurückgezogen, so kann der Schwenkrahmen 9 in Richtung des Pfeiles b schwenken und dabei die Bedruckstoffbahn 4 an die Aufwickelwalze 7 andrücken. Anstelle der beschriebenen Bahnfangvorrichtung kann auch jede andere bekannte Fangvorrichtung Verwendung finden.As can be seen in FIG. 2, the web catching device has 5 a take-up roller 7, which in the in FIG shown provision the substrate web not touched. The take-up roller 7 is not one illustrated drive gear chain having gears by means of a motor 8, for example an electric geared motor, driven. The web safety device also has a swivel frame 9 which is about a fixed axis 10 is pivotable. The swivel frame 9 takes an axis 11 around which loosely rotatable one Counter-pressure roller 12 is mounted. Instead of one Back pressure roller can also have multiple back pressure rollers the axis 11 be mounted. In the resting position of the Web safety device 5 is the swivel frame 9 under the Effect of a spring, not shown, on one Lock pin 13 of a trigger device 14, for example an electromagnet or a hydraulic or Pneumatic cylinder, on. If the locking pin 13 withdrawn, the swivel frame 9 can in the direction of arrow b and swivel the substrate 4 press on the take-up roller 7. Instead of described webbing safety device can also be any other known safety device find use.

    In Bahnlaufrichtung a unmittelbar benachbart der Bahnfangvorrichtung 5 ist die Trenn- und Haltevorrichtung 6 angeordnet. Diese weist einen stätionär angeordneten Messerbalken 15 mit einem Messer 16 und -auf der dem Trockner zugewandten Seite- einer Klemmleiste 17 auf. In the web running direction a directly adjacent to the Web catching device 5 is the separating and holding device 6 arranged. This has a stationary arrangement Knife bar 15 with a knife 16 and -on the Dryer facing side - a terminal block 17.

    Unter dem Messerbalken 15 ist in bzw. entgegen der Richtung des Pfeiles c bewegbar ein Hubbalken 18 angeordnet. Dieser trägt an seiner Oberseite einen Gegenhalter 19, der zum Schnitt mit dem Messer 16 zusammenwirkt, und eine Klemmfläche 20, zwischen der und der Klemmleiste 17 die Bahn 4 festgelegt werden kann. Anstelle der dargestellten Trenn- und Haltevorrichtung 6 kann auch eine andere bekannte Trenn- und Haltevorrichtung Verwendung finden, die die Bedruckstoffbahn trennt und das zum Trockner führende Trum festhält.Under the cutter bar 15 is in or against the A walking beam 18 is movable in the direction of arrow c arranged. This carries one on its top Bracket 19, which can be cut with the knife 16 cooperates, and a clamping surface 20, between which and the terminal strip 17, the path 4 can be set. Instead of the separating and holding device 6 shown can also be another known separation and holding device Find the use of the substrate separates and holds the strand leading to the dryer.

    Zur Ansteuerung der Bahnfangvorrichtung 6 sowie der Trenn- und Haltevorrichtung 7 ist ein Bahnrißmelder 21 vorgesehen, der beim Ausführungsbeispiel als die Bedruckstoffbahn 4 berührungslos abtastender Sensor ausgebildet ist. Der Bahnrißmelder 21 ist zweckmäßig zwischen der Trenn- und Haltevorrichtung 6 und dem Trockner 3 angeordnet. Der Bahnrißmelder 21 gibt im Falle eines Bahnrisses ein Auslösesignal an eine Steuereinheit 22. Diese Steuereinheit 22 weist einen Mikroprozessor 23 auf, der im Falle eines vom Bahnrißmelder abgegebenen Auslösesignales die Auslöseeinrichtung 14 aktiviert, sodaß der Sperrstift 13 zurückgezogen wird. Nunmehr kann der Schwenkrahmen 9 in Richtung des Pfeiles b schwenken und dadurch über die Gegendruckwalze 12 die Bedruckstoffbahn 4 an die Aufwickelwalze 7 andrücken. Dabei kann durch ein stangenförmiges Umlenkorgan 25 am Schwenkrahmen 9 die Bedruckstoffbahn 4 in einem vergleichsweise großen Umschlingungsbereich an die Aufwickelwalze 7 herangeführt werden. To control the web catching device 6 and the Separating and holding device 7 is a web break detector 21 provided that in the embodiment as the printing substrate 4 non-contact scanning sensor is. The web break detector 21 is useful between the Separating and holding device 6 and the dryer 3 arranged. The web break detector 21 gives in the case of a Web break a trigger signal to a control unit 22. This control unit 22 has a microprocessor 23, the one in the case of one released by the web break detector Triggering signal activates the triggering device 14, so that the locking pin 13 is withdrawn. Now can the swivel frame 9 pivot in the direction of arrow b and thereby on the counter-pressure roller 12 Press the printing material web 4 onto the take-up roller 7. It can by a rod-shaped deflector 25 on Swivel frame 9, the printing material web 4 in one comparatively large loop area to the Winding roller 7 are brought up.

    Die Aufwickelwalze 7 ist beim dargestellten Ausführungsbeispiel mittels des Motors 8 mit einer Umfangsgeschwindigkeit angetrieben, die über der Laufgeschwindigkeit der Bedruckstoffbahn 4 während des Druckes liegt, beispielsweise diese Geschwindigkeit um 15% übersteigt. Unmittelbar nach dem in Funktiontreten der Bahnfangvorrichtung durch Andruck der Bedruckstoffbahn 4 mittels der Gegendruckwalze 12 an die Aufwickelwalze 7 beginnt der Mikroprozessor 23 die Drehzahl des Motors 8 und damit der Aufwickelwalze 7 zu vermindern und zwar auf ein Maß, das der jeweiligen Bahnlaufgeschwindigkeit der nunmehr nicht angetriebenen Bedruckstoffbahn 4 unter Berücksichtigung des sich durch die Aufwickelung vergrößernden Aufwickeldurchmessers der Walze 7 bestimmt. Die Bahnfangvorrichtung 5 übt also nach der Phase der erhöhten Umfangsgeschwindigkeit der Aufwickelwalze 7 beim Ansprechen der Bahnfangvorrichtung 5 keine weitere Beschleunigung auf die Bedruckstoffbahn 4 aus, sodaß die Gefahr ausgeschaltet ist, daß die Aufwickelwalze 7 einen weiteren Bahnriß verursacht.The winding roller 7 is shown Embodiment by means of the motor 8 with a Peripheral speed driven above the Running speed of the substrate 4 during the Pressure, for example, this speed Exceeds 15%. Immediately after it comes into operation the web safety device by pressing the Printing material web 4 by means of the counter-pressure roller 12 to the The winding roller 7 starts the microprocessor 23 Speed of the motor 8 and thus the take-up roller 7 too reduce to a level that the respective Web running speed of the now not driven Printing material web 4 taking into account the through the winding increasing the winding diameter of the Roller 7 determined. The web catching device 5 thus exercises the phase of increased peripheral speed of the Winding roller 7 when the web catching device responds 5 no further acceleration onto the substrate 4 off, so that there is no danger that the Winding roller 7 caused another web break.

    Die Steuereinrichtung 22 weist weiterhin ein Zeitverzögerungsglied 24 auf, das mit einer geringen zeitlichen Verzögerung die Trenn- uhnd Haltevorrichtung 6 ansteuert. Hierdurch werden beispielsweise über einen Pneumatik- oder Hydraulikzylinder oder einen Elektromagneten der Gegenhalter 19 mit der Klemmfläche 20 gegen den Messerbalken 15 geführt. Infolge der geringen zeitlichen Verzögerung, mit der die Trenn- und Haltevorrichtung 6 in Funktion tritt, ist sichergestellt, daß die Bedruckstoffbahn sicher von der Aufwickelwalze 7 ergriffen ist und diese einen der Bahnlaufrichtung a entgegengesetzten Zug auf das im Trockner 3 befindliche Trum der Bedruckstoffbahn 4 ausüben kann. Die Bedruckstoffbahn 4 ist daher im Bereich des Messers 16 gespannt, wodurch sich ein exakter Schnitt quer zur Laufrichtung der Bedruckstoffbahn 4 erzielen läßt. Der bei einer Auslösung der Bahnfangvorrichtung 5 zwischen der Aufwickelwalze 7 und der Gegendruckwalze 12 und dem Messer 16 befindliche kurze Teil der Bedruckstoffbahn 4 kann infolge des rechtwinklig zur Bahnlaufrichtung erfolgten Schnittes beim Aufwickeln auf die Aufwickelwalze 7 keinen einseitig vergrößerten Aufwickeldurchmesser hervorrufen, der zu einem über die Breite ungleichmäßigen Zug auf das in den Druckwerken 2 befindliche Trum der Bedruckstoffbahn 4 führen könnte. Die Gefahr eines weiteren Rißes der Bedruckstoffbahn 4 im Bereich des Einzugwerkes ist daher vermieden. Anstelle eines Zeitverzögerungsgliedes 24 kann auch eine Trenn- und Haltevorrichtung 6 Verwendung finden, deren Ansprechträgheit so groß ist, daß der Schnitt der Bedruckstoffbahn 4 erst dann erfolgt, wenn die Aufwickelwalze 7 die Bedruckstoffbahn 4 mit einem solchen Umfangsbereich ergriffen hat, daß eine weitere Aufwickelung gesichert ist.The control device 22 also has a Time delay element 24 on that with a low time delay the separating and holding device 6 controls. As a result, for example Pneumatic or hydraulic cylinders or one Electromagnets of the counterhold 19 with the clamping surface 20th led against the cutter bar 15. As a result of the low time delay with which the separation and Holding device 6 comes into play, it is ensured that the printing material web is secure from the take-up roller 7 is taken and this one of the web running direction a opposite train to that in the dryer 3 Run the substrate 4 can exercise. The substrate web 4 is therefore clamped in the area of the knife 16, which creates an exact cut across the direction of travel the printing material web 4 can achieve. The one Release of the web catching device 5 between the winding roller 7 and the platen roller 12 and the knife 16 located short part of the substrate 4 can as a result of the perpendicular to the web running direction Cut when winding on the winding roller 7 none cause increased winding diameter on one side, which leads to an uneven pull across the width of the in the printing units 2 run of the substrate web 4 could result. The danger of another crack of the Printing material web 4 in the area of the feed mechanism is therefore avoided. Instead of a time delay element 24 can also a separation and holding device 6 use find whose responsiveness is so great that the The printing material web 4 is cut only when the winding roller 7 the printing material web 4 with a has gripped such a peripheral area that another Winding is secured.

    Wie die vorstehende Beschreibung zeigt, ist die Erfindung nicht auf das dargestellte Ausführungsbeispiel beschränkt.As the above description shows, the invention is not limited to the illustrated embodiment.

    Claims (10)

    1. A device for preventing web tear caused damages to a rotary printing press comprising a dryer (3), such device comprising a web catching device (5) and a severing and halting device (6) arranged following the web catching device (5) in the direction of web travel, whereby the web catching device (5) and the severing and halting device (6) being arranged between the last printing unit (2) of the printing press and the dryer (3), and such device further comprising a web tear detector (21) adapted to cause operation in sequence of the web catching device (5) and the severing and halting device (6).
    2. The device as claimed in claim 1, characterized in that the web tear detector (21) is a sensor adapted to scan the web (4) without contact therewith, such sensor being adapted to control a control unit (22) adapted to cause operation of the web catching device (5) and with a slight time lag the severing and halting device (6).
    3. The device as claimed in one of the foregoing claims, characterized in that the control unit (22) comprises a time delay member (24) for controling of the severing and halting device (6).
    4. The device as claimed in claim 1 or 2, characterized in that the severing and halting device (6) is adapted to operate with a time lag owing to an inherent delay characteristic thereof.
    5. The device as claimed in one of the foregoing claims, characterized in that the web catching device (5) comprises a take up roll (7) which is driven by a motor (8) at a peripheral speed in excess of the speed of the web.
    6. The device as claimed in claim 5, characterized in that the speed of rotation of the motor (8) can be steplessly varied and in that the control unit (22) comprises a control member (23) adapted to reduce the peripheral speed of the take up roll (7) to the speed of travel of the web after catching of the web (4).
    7. The device as claimed in claim 6, wherein said control member is a microprocessor (23).
    8. The device as claimed in one of the foregoing claims, characterized in that the web catching device (5) and the severing and halting device (6) are arranged directly adjacent to one another.
    9. The device as claimed in one of the foregoing claims, characterized in that the web catching device (5) and the severing and halting device (6) are united together as a single sub-assembly.
    10. The device as claimed in one of the foregoing claims, characterized in that the severing and halting device (6) comprises gripping means (17, 20) arranged on a knife (16) on the side facing the dryer.
    EP95113880A 1994-09-14 1995-09-05 Device for preventing damage in a printing machine Expired - Lifetime EP0703077B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE4432659A DE4432659A1 (en) 1994-09-14 1994-09-14 Device for preventing damage to the printing unit
    DE4432659 1994-09-14

    Publications (2)

    Publication Number Publication Date
    EP0703077A1 EP0703077A1 (en) 1996-03-27
    EP0703077B1 true EP0703077B1 (en) 1998-04-08

    Family

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP95113880A Expired - Lifetime EP0703077B1 (en) 1994-09-14 1995-09-05 Device for preventing damage in a printing machine

    Country Status (3)

    Country Link
    US (1) US5619923A (en)
    EP (1) EP0703077B1 (en)
    DE (2) DE4432659A1 (en)

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    DE102004014777A1 (en) * 2004-03-26 2005-10-13 Baldwin Germany Gmbh Strip collecting device for a roller printing machine comprises a drive unit having an electro-pneumatic adjusting drive as quick-acting pulling drive of the pneumatic muscle type
    DE10327910B4 (en) * 2003-06-20 2012-01-26 Baldwin Germany Gmbh Web catching device

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    US6079328A (en) * 1996-10-11 2000-06-27 Koenig & Bauer Aktiengesellschaft Securing device for a printed carrier
    JP4876861B2 (en) * 2006-11-13 2012-02-15 富士ゼロックス株式会社 Printing system, control device and program
    EP3603974B1 (en) * 2017-03-24 2023-01-04 Sumitomo Heavy Industries, Ltd. Control apparatus
    TR202019502A2 (en) * 2020-12-02 2021-01-21 Etapak Baski Ambalaj Sanayi Ve Ticaret Anonim Sirketi A FILM CAPTURE DEVICE DESIGNED FOR USE IN PRINTING MACHINES

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    DE3215473C2 (en) * 1982-04-24 1985-03-07 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Device for preventing printing unit damage in the event of print carrier web breaks
    US4532500A (en) * 1982-09-02 1985-07-30 Pako Corporation Web tension and break sensor system for photosensitive web processors
    DE3822497A1 (en) * 1987-12-02 1989-10-19 Kotterer Grafotec DEVICE FOR PREVENTING MACHINE DAMAGE
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    DE4201481A1 (en) * 1992-01-21 1993-07-22 Heidelberger Druckmasch Ag DEVICE FOR HANDLING MATERIAL COATINGS IN PROCESSING MACHINES
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    Cited By (3)

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    Publication number Priority date Publication date Assignee Title
    DE10327910B4 (en) * 2003-06-20 2012-01-26 Baldwin Germany Gmbh Web catching device
    DE102004014777A1 (en) * 2004-03-26 2005-10-13 Baldwin Germany Gmbh Strip collecting device for a roller printing machine comprises a drive unit having an electro-pneumatic adjusting drive as quick-acting pulling drive of the pneumatic muscle type
    DE102004014777B4 (en) * 2004-03-26 2014-04-10 Baldwin Germany Gmbh Web catching device of a web-fed rotary printing press

    Also Published As

    Publication number Publication date
    EP0703077A1 (en) 1996-03-27
    DE59501831D1 (en) 1998-05-14
    DE4432659A1 (en) 1996-03-21
    US5619923A (en) 1997-04-15

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