EP0468254A2 - Transverse cutter for printed web - Google Patents

Transverse cutter for printed web Download PDF

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Publication number
EP0468254A2
EP0468254A2 EP91111231A EP91111231A EP0468254A2 EP 0468254 A2 EP0468254 A2 EP 0468254A2 EP 91111231 A EP91111231 A EP 91111231A EP 91111231 A EP91111231 A EP 91111231A EP 0468254 A2 EP0468254 A2 EP 0468254A2
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EP
European Patent Office
Prior art keywords
suction
knives
knife roller
blowing
knife
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91111231A
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German (de)
French (fr)
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EP0468254A3 (en
EP0468254B1 (en
Inventor
Hilmar Vits
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0468254A2 publication Critical patent/EP0468254A2/en
Publication of EP0468254A3 publication Critical patent/EP0468254A3/en
Application granted granted Critical
Publication of EP0468254B1 publication Critical patent/EP0468254B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/18—Means for removing cut-out material or waste
    • B26D7/1845—Means for removing cut-out material or waste by non mechanical means
    • B26D7/1863—Means for removing cut-out material or waste by non mechanical means by suction

Definitions

  • the invention relates to a cross cutter for material webs provided with printed images, consisting of a knife roller equipped with at least one pair of parallel knives and a stationary counter knife as well as a discharge device operated with suction air for the waste strips resulting from the pair of knives during cross cutting.
  • the knife roller has a slot between each pair of parallel knives, into which the waste strip is sucked in and pneumatically discharged through a hollow roller pin.
  • Such a cross cutter has not proven itself in practice because it can easily lead to blockages in the discharge channel.
  • An increase in the cross-section of the discharge channel that reduces the risk of clogging is countered by the associated reduction in the stability of the knife roller. This applies in particular to the case where the knife roller is equipped with two pairs of parallel knives.
  • the hardened, smooth, synchronous counter-roller is assigned to the cutter block equipped with a pair of parallel cutters. This is studded with protruding needles, which pierce the material web so that the waste strip is held by them and is stripped on the opposite side by stationary teeth of a comb.
  • the invention has for its object to provide a cross cutter for material webs provided with printed images of the type mentioned, with which the resulting waste strips can be removed without problems with high performance without great expenditure on device technology.
  • the discharge device between the knives of each pair of knives has suction and blowing openings which alternate with a blowing and a via a channel running through the knife roller by means of a valve control as a function of the angle of rotation of the rotating knife roller
  • Suction air source can be connected in such a way that the suction and blowing openings are connected to the suction air source during the cut and to the blown air source in a rotating region rotated to the rotational position of the cut, in which a suction hood for the waste strips repelled by the blown air is arranged above the knife roller
  • the valve control is arranged on the face of the knife roller and stationary, rotatably offset inlets and outlets of the suction and blown air sources and at least one alternately sweeping over them Connection of the channel leading to and from the suction and blown air openings.
  • the inlet is preferably arranged on one end face of the knife roller and the outlet on the other end face, and each channel has a connection on both end
  • the waste strips accumulating between the knives of a pair of knives are safely removed from the processing process even at high outputs, because it is possible by means of the valve control to apply a high vacuum and a high overpressure of the suction and blowing air source to the suction and blowing air openings lay.
  • the switching operations of the valve control with rapid pressure build-up and reduction required for the cross cutter to be used in printing plants can be mastered without any problems with special training of the valve control. With 30 print images per second, 60 air changes per second are necessary. If you start by 1/3 of a turn for the valve control switchover, there is a period of a few milliseconds for the pressure build-up and release. With the changeover derived from the relative movement of the knife roller and fixed inlets and outlets of the suction and blown air sources, this requirement can be met with certainty.
  • the suction hood has blowing air-operated floating nozzles on the inside with a conveying effect.
  • the waste strips can be protected against unintentional detachment by providing support levels set back between the knives and their cutting edges.
  • the knives have a certain shielding function for the waste strips.
  • a material web 1 provided with printed images is fed via a suspension table 2 to a cross cutter which consists of a rotating knife roller 3 with two pairs of parallel knives 4a, 4b and a stationary counter knife 5 with a knife 4c. Between the knives 4a, 4b there is a series of suction and blowing openings 9, which can be alternately connected to a suction and blowing air source via radial channels 17 in a manner to be described, depending on the rotational position of the knife roller 3.
  • the knife 4a In the position of the knife roller 3 shown in FIG. 1, the knife 4a has just cut a sheet 6 with the printed image with the knife 4c from the material web 1, which sheet is removed via a floating table 7. A waste strip 8 which is still to be cut is held by the suction and blowing openings 9 which are subjected to negative pressure.
  • the knife 4b cuts off the waste strip 8 together with the knife 4c. This remains attached to the suction and blowing openings 9 until the suction and blowing openings are disconnected from the suction air source and connected to the blowing air source. This happens after at least 1/4 and at most 1/2, in particular 1/3, rotation of the knife roller 3 from the cutting position.
  • a suction hood 12 is arranged above the knife roller 3 and is equipped with a conveying effect in the direction of arrow 11, 14 to form blown air nozzles 13 arranged on the inside.
  • the knife roller 3 has webs 10, on the sides of which the knives 4a, 4b are fastened by means of screws 21a, 21. Via these recesses 22, the screws 21 a, 21 b are easily accessible for assembly purposes.
  • the cutouts 22 are covered by shells 23.
  • the webs 10 carry the suction and blowing openings 9, which consist of suction cups 9a and holding, axially pierced fastening screws 9b.
  • the axial channel of the fastening screws 9b opens into the channel 17, which in turn opens into an axial groove 16a of a rod 15 which is seated in a central bore in the knife roller 3.
  • two axial grooves 16a, 16b are arranged in the rod 15. They are sealed off from one another by sealing strips which are seated in grooves 18 and acted upon by an elastic hose.
  • connections 27a, 27b are provided at the ends at the ends of both channels 16a, 16b, which lie tightly against a stationary distributor plate 25a, 25b with an inlet 26a and an outlet 26b.
  • the inlets and outlets 26a, 26b are rotatably offset from one another in such a way that, when the suction and blowing openings 9 are in the cutting position, they have the inlets 26a for suction air (see FIG. 4 below) and the suction and blowing openings 9 which are not in the cutting position are connected to the Outlets 26b for blown air (see FIG. 4 above) are connected.
  • the rotational displacement of the inlets and outlets 26a, 26b is such that, on the one hand, the waste strips are held long enough and, on the other hand, are blown off sufficiently early for removal. This can mean that the inlets and outlets 26a, 26b must not be diametrically opposite.
  • the stationary distributor plates 25a, 25b are screwed onto hollow pins 24a, 24b, which in turn are connected to the suction and pressure medium sources with lines.
  • the stationary hollow pins 24a, 24b are mounted by means of bearings 28a, 28b in a hollow bearing pin 3a of the knife roller 3.
  • the pressure required for sealing between the distributor plate 25a and the connections 27a, 27b is applied by a spring 30 which is supported on the one hand on a threaded ring 29 seated in the hollow pin 3a and on the other hand on the hollow pin 24b designed as an angular contact ball bearing 28b.
  • a centrifugal force of 180 g acts on a 1 m wide waste strip with a weight of 2 g.
  • the holding force on the suction cups 9a of 10 mm inner diameter in 30 mm division is 1250 g and the repelling force of the blowing openings 9 b of 2 mm diameter is 50 g.

Abstract

The invention relates to a transverse cutter for printed webs, comprising a cutter cylinder 3 and a pair of parallel cutters 4a, 4b arranged thereon and a stationary counter-cutter 4c. Arranged between the cutters 4a, 4b are suction and blowing openings 9 which can be subjected via a valve control, as a function of the rotary position of the cutter cylinder, alternately to a vacuum and blowing air. A waste strip 8 cut off during the transverse cutting is held, by the vacuum, between the cutters of the suction and blowing openings 9 and transported to a point at which it is blown away by means of blowing air and removed via a suction hood 12 arranged above the cutter cylinder. The valve control for switching between blowing air and suction air is arranged on the face of the cutter cylinder 3 and has inlet and outlets which are rotationally offset relative to one another and are covered by connections connected to the suction and blowing openings 9 via channels 16a, 16b, 17 in the cutter cylinder 3. <IMAGE>

Description

Die Erfindung bezieht sich auf einen Querschneider für mit Druckbildern versehene Materialbahnen, bestehend aus einer mit mindestens einem Paar paralleler Messer bestückten Messerwalze und einem stationär angeordneten Gegenmesser sowie einer mit Saugluft betriebenen Abführvorrichtung für die beim Querschneiden zwischen dem Messerpaar anfallenden Abfallstreifen.The invention relates to a cross cutter for material webs provided with printed images, consisting of a knife roller equipped with at least one pair of parallel knives and a stationary counter knife as well as a discharge device operated with suction air for the waste strips resulting from the pair of knives during cross cutting.

In Druckereien werden die Anforderungen an den Verarbeitungsprozeß von der Papierrolle zum bedruckten Bogen immer höher. Die Bogen sollen schon in der Rollendruckmaschine druckbildfertig geschnitten werden, und die personalaufwendige Arbeit des Entstapelns, Rüttelns und Planschneidens der Bogen soll entfallen. Dafür ist es nötig, die unbedruckten oder mit Druckmarken bedruckten, zwischen den Druckbildern beim Querschneiden anfallenden Abfallstreifen aus dem Bereich des Förderweges der beschnittenen Bogen zu entfernen, weil andernfalls der vagabundierende Abfallstreifen den weiteren Verarbeitungsprozeß stört.In print shops, the demands placed on the processing process from the paper roll to the printed sheet are increasing. The sheets should already be cut ready for printing in the roll printing machine, and the labor-intensive work of unstacking, shaking and cutting the sheets should be eliminated. For this purpose, it is necessary to remove the unprinted or printed waste strips between the printed images during cross-cutting from the area of the conveying path of the trimmed sheets, because otherwise the stray waste strips interfere with the further processing process.

Bei einem bekannten Querschneider der eingangs genannten Art weist die Messerwalze zwischen jedem Paar paralleler Messer einen Schlitz auf, in den der Abfallstreifen hineingesaugt und durch einen hohlen Walzenzapfen pneumatisch abgeführt wird. Ein solcher Querschneider hat sich in der Praxis nicht bewährt, weil es leicht zu Verstopfungen in dem Abführkanal kommen kann. Einer die Verstopfungsgefahr vermindernden Vergrößerung des Querschnittes des Abführkanals steht die damit verbundene Verminderung der Stabilität der Messerwalze entgegen. Dies gilt insbesondere für den Fall, daß die Messerwalze mit zwei Paar parallelen Messern bestückt ist.In a known cross cutter of the type mentioned, the knife roller has a slot between each pair of parallel knives, into which the waste strip is sucked in and pneumatically discharged through a hollow roller pin. Such a cross cutter has not proven itself in practice because it can easily lead to blockages in the discharge channel. An increase in the cross-section of the discharge channel that reduces the risk of clogging is countered by the associated reduction in the stability of the knife roller. This applies in particular to the case where the knife roller is equipped with two pairs of parallel knives.

Bei einem anderen Querschneider sind zum Halten und Abführen des Abfallstreifens rein mechanische Mittel vorgesehen. Bei diesem Querschneider ist der mit einem Paar paralleler Messer bestückten Messerwalze eine gehärtete, glatte, synchronlaufende Gegenwalze zugeordnet. Diese ist mit vorstehenden Nadeln besetzt, die in die Materialbahn so einstechen, daß der Abfallstreifen von ihnen festgehalten und auf der abgewandten Seite durch ortsfeste Zinken eines Kammes abgestreift wird.In another cross cutter, purely mechanical means are provided for holding and removing the waste strip. In this cross cutter, the hardened, smooth, synchronous counter-roller is assigned to the cutter block equipped with a pair of parallel cutters. This is studded with protruding needles, which pierce the material web so that the waste strip is held by them and is stripped on the opposite side by stationary teeth of a comb.

Ferner sind andere Schneidvorrichtungen für Materialbahnen und Bogen bekannt, die aus zwei synchronumlaufenden Walzen bestehen, von denen die eine Walze ein Messer zum Ausschneiden eines Fensters trägt und die andere Walze als Gegendruckwalze ausgebildet ist (DE-OS 19 28 966). Bei dieser Schneidvorrichtung sind innerhalb des Messers Saug- und Blasöffnungen vorgesehen, die mit über einen Teil des Umfanges der Messerwalze verlaufenden Kanälen verbunden sind. Die Messerwalze ist von einer Absaughaube derart umgeben, daß beim Schnitt die Öffnungen der Kanäle innerhalb der Absaughaube liegen. Auf diese Art und Weise wird das Abfallstück beim Schnitt angesaugt. Solange sich bei weiterer Drehung die Eingänge der Kanäle in der Absaughaube befinden, wird das Abfallstück durch die Saugkraft festgehalten. Wenn jedoch die Eingänge der Kanäle die Absaughaube verlassen, wird über die Saugkanäle aus der Atmosphäre Luft angesaugt und das Abfallstück für die Abführung freigegeben. Bei kleinen Leistungen mag es möglich sein, das Abfallstück zu halten und auch im Bereich der Absaughaube abzulösen und abzufördern. Bei großen Leistungen, wie sie heute beim Rollenoffsetdruck gefordert werden, dürfte der über die Absaughaube und die Kanäle im Bereich der Messer aufzubauende Unterdruck nicht ausreichen, um die aufgrund der hohen Rotationsgeschwindigkeit einer großen Fliehkraft unterworfenen Abfallstücke zu halten. Ohne eine unmittelbare aktive Beaufschlagung mit hohem Unter- und Überdruck lassen sich die Abfallstücke nicht halten und/oder ablösen.Furthermore, other cutting devices for material webs and sheets are known which consist of two synchronously rotating rollers, of which one roller carries a knife for cutting out a window and the other roller is designed as a counter-pressure roller (DE-OS 19 28 966). In this cutting device, suction and blowing openings are provided within the knife, which are connected to channels running over part of the circumference of the knife roller. The knife roller is surrounded by a suction hood in such a way that the openings of the channels lie within the suction hood during cutting. In this way, the waste piece is sucked in during the cut. As long as the entrances of the channels are in the suction hood during further rotation, the waste piece is held in place by the suction force. However, when the entrances of the ducts leave the suction hood, air is drawn in from the atmosphere via the suction ducts and the piece of waste is released for removal. With small capacities it may be possible to hold the piece of waste and also to detach and remove it in the area of the suction hood. For large capacities, as are required today in web offset printing, the negative pressure to be built up via the suction hood and the channels in the area of the knives should not be sufficient to hold the waste pieces which are subjected to a high centrifugal force due to the high rotational speed. The waste pieces cannot be held and / or detached without an immediate active application of high negative and positive pressure.

Schließlich ist eine Vorrichtung zum Schneiden von Bogen oder Materialbahnen bekannt, bei der die beim Schnitt anfallenden Abfallstücke durch Unterdruck festgehalten und an einer zum Schnitt versetzten, für das Abführen geeigneten Stelle durch die Zufuhr von Blasluft abgestoßen werden. Bei dieser Vorrichtung erfolgt die Zu- und Abfuhr von Saug- und Blasluft über eine hohle Achswelle, Schläuche und Ventile. Eine solche Vorrichtung wird jedoch wegen des dafür erforderlichen Aufwandes als nicht geeignet abgelehnt (DE-OS 19 28 966, Seite 2 unten bis Seite 3 oben).Finally, a device for cutting sheets or webs of material is known, in which the waste pieces resulting from the cutting are held in place by negative pressure and are repelled by the supply of blown air at a point which is displaced and is suitable for removal. In this device, the suction and blowing air is supplied and removed via a hollow shaft, hoses and valves. However, such a device is rejected as unsuitable because of the effort required for this (DE-OS 19 28 966, page 2 below to page 3 above).

Der Erfindung liegt die Aufgabe zugrunde, einen Querschneider für mit Druckbildern versehene Materialbahnen der eingangs genannten Art zu schaffen, mit dem mit hoher Leistung ohne großen vorrichtungstechnischen Aufwand die anfallenden Abfallstreifen störungsfrei abtransportiert werden.The invention has for its object to provide a cross cutter for material webs provided with printed images of the type mentioned, with which the resulting waste strips can be removed without problems with high performance without great expenditure on device technology.

Diese Aufgabe wird bei dem Querschneider dadurch gelöst, daß die Abführvorrichtung zwischen den Messern eines jeden Messerpaares Saug- und Blasöffnungen aufweist, die über einen durch die Messerwalze verlaufenden Kanal mittels einer Ventilsteuerung in Abhängigkeit vom Drehwinkel der sich drehenden Messerwalze abwechselnd mit einer Blas- und einer Saugluftquelle verbindbar sind, derart, daß die Saug- und Blasöffnungen mit der Saugluftquelle beim Schnitt und mit der Blasluftquelle in einem zur Drehstellung des Schnittes verdrehten Drehbereich verbunden sind, in dem über der Messerwalze eine Absaughaube für die durch die Blasluft abgestoßenen Abfallstreifen angeordnet ist, wobei die Ventilsteuerung stirnseitig an der Messerwalze angeordnet ist und stationäre, gegeneinander drehversetzte Ein- und Auslässe der Saug- und Blasluftquelle sowie mindestens einen diesen abwechselnd überstreichenden Anschluß des zu und von den Saug- und Blasluftöffnungen führenden Kanals aufweist. Dabei ist vorzugsweise der Einlaß an der einen Stirnseite der Messerwalze und der Auslaß an deren anderen Stirnseite angeordnet, und jeder Kanal weist an beiden Stirnseiten einen Anschluß auf.This object is achieved in the cross cutter in that the discharge device between the knives of each pair of knives has suction and blowing openings which alternate with a blowing and a via a channel running through the knife roller by means of a valve control as a function of the angle of rotation of the rotating knife roller Suction air source can be connected in such a way that the suction and blowing openings are connected to the suction air source during the cut and to the blown air source in a rotating region rotated to the rotational position of the cut, in which a suction hood for the waste strips repelled by the blown air is arranged above the knife roller, wherein the valve control is arranged on the face of the knife roller and stationary, rotatably offset inlets and outlets of the suction and blown air sources and at least one alternately sweeping over them Connection of the channel leading to and from the suction and blown air openings. In this case, the inlet is preferably arranged on one end face of the knife roller and the outlet on the other end face, and each channel has a connection on both end faces.

Bei dem erfindungsgemäßen Querschneider werden die zwischen den Messern eines Messerpaares anfallenden Abfallstreifen auch bei hohen Leistungen sicher aus dem Verarbeitungsprozeß entfernt, weil es mittels der Ventilsteuerung möglich ist, einen hohen Unterdruck und einen hohen Überdruck der Saug- und Blasluftquelle an die Saug- und Blasluftöffnungen zu legen. Die bei dem in Druckereien einzusetzenden Querschneider erforderlichen Schaltvorgänge der Ventilsteuerung mit schnellem Druckauf- und -abbau lassen sich unter besonderer Ausbildung der Ventilsteuerung problemlos beherrschen. Bei 30 Druckbildern je Sekunde sind 60 Luftumschaltungen je Sekunde nötig. Setzt man für den Umschaltvorgang der Ventilsteuerung jeweils 1/3 Umdrehung an, dann bleibt für den Druckauf- und -abbau eine Zeitspanne von wenigen Millisekunden übrig. Mit der aus der Relativbewegung von Messerwalze und feststehenden Ein- und Auslässen der Saug- und Blasluftquelle abgeleiteten Umschaltung läßt sich diese Forderung sicher erfüllen.In the cross cutter according to the invention, the waste strips accumulating between the knives of a pair of knives are safely removed from the processing process even at high outputs, because it is possible by means of the valve control to apply a high vacuum and a high overpressure of the suction and blowing air source to the suction and blowing air openings lay. The switching operations of the valve control with rapid pressure build-up and reduction required for the cross cutter to be used in printing plants can be mastered without any problems with special training of the valve control. With 30 print images per second, 60 air changes per second are necessary. If you start by 1/3 of a turn for the valve control switchover, there is a period of a few milliseconds for the pressure build-up and release. With the changeover derived from the relative movement of the knife roller and fixed inlets and outlets of the suction and blown air sources, this requirement can be met with certainty.

Zur Unterstützung der Abführung der anfallenden Abfallstreifen ist nach einer weiteren Ausgestaltung der Erfindung vorgesehen, daß die Absaughaube innenseitig blasluftbetriebene Schwebedüsen mit Förderwirkung aufweist.To support the removal of the waste strips, it is provided according to a further embodiment of the invention that the suction hood has blowing air-operated floating nozzles on the inside with a conveying effect.

Insbesondere bei hohen Drehgeschwindigkeiten und den damit zwangsläufig auftretenden Turbulenzen am Umfang der Messerwalze können die Abfallstreifen gegen unbeabsichtigtes Ablösen noch dadurch geschützt werden, daß zwischen den Messern und gegenüber ihren Schneiden zurückversetzte Abstützebenen für sie vorgesehen sind. Bei dieser Ausgestaltung üben die Messer eine gewisse Abschirmfunktion für die Abfallstreifen aus.Particularly at high speeds of rotation and the turbulence that inevitably occurs on the circumference of the knife roller, the waste strips can be protected against unintentional detachment by providing support levels set back between the knives and their cutting edges. In this embodiment, the knives have a certain shielding function for the waste strips.

Im folgenden wird die Erfindung anhand einer ein Ausführungsbeispiel darstellenden Zeichnung näher erläutert.The invention is explained in more detail below with the aid of a drawing representing an exemplary embodiment.

Im einzelnen zeigen:

  • Figur 1 einen Querschneider im Querschnitt während des Schnittes,
  • Figur 2 ein Paar Messer des Querschneiders gemäß Figur 1 in einem vergrößerten Ausschnitt der Figur 1 im Querschnitt,
  • Figur 3 das Messerpaar gemäß Figur 2 in Aufsicht,
  • Figur 4 eine Messerwalze des Querschneiders gemäß Figur 1 in schematischer Seitenansicht und
  • Figur 5 eine Messerwalze des Querschneiders gemäß Figur 1 im Bereich einer Stirnseite in einem vergrößerten Ausschnitt der Figur 1 im Axialschnitt.
In detail show:
  • FIG. 1 shows a cross cutter in cross section during the cut,
  • FIG. 2 shows a pair of knives of the cross cutter according to FIG. 1 in an enlarged section of FIG. 1 in cross section,
  • FIG. 3 the pair of knives according to FIG. 2 in supervision,
  • 4 shows a knife roller of the cross cutter according to FIG. 1 in a schematic side view and
  • FIG. 5 shows a knife roller of the cross cutter according to FIG. 1 in the area of an end face in an enlarged section of FIG. 1 in axial section.

Eine mit Druckbildern versehene Materialbahn 1 wird über einen Schwebetisch 2 einem Querschneider zugeführt, der aus einer rotierenden Messerwalze 3 mit zwei Paar parallelen Messern 4a,4b und einem stationären Gegenmesser 5 mit einem Messer 4c besteht. Zwischen den Messern 4a,4b ist eine Reihe von Saug- und Blasöffnungen 9 angeordnet, die über radiale Kanäle 17 in noch zu beschreibender Weise in Abhängigkeit von der Drehstellung der Messerwalze 3 abwechselnd an eine Saug- und Blasluftquelle anschließbar sind.A material web 1 provided with printed images is fed via a suspension table 2 to a cross cutter which consists of a rotating knife roller 3 with two pairs of parallel knives 4a, 4b and a stationary counter knife 5 with a knife 4c. Between the knives 4a, 4b there is a series of suction and blowing openings 9, which can be alternately connected to a suction and blowing air source via radial channels 17 in a manner to be described, depending on the rotational position of the knife roller 3.

In der in Figur 1 dargestellten Stellung der Messerwalze 3 hat das Messer 4a gerade mit dem Messer 4c von der Materialbahn 1 einen Bogen 6 mit Druckbild abgeschnitten, der über einen Schwebetisch 7 abgeführt wird. Ein noch abzuschneidender Abfallstreifen 8 wird von den mit Unterdruck beaufschlagten Saug- und Blasöffnungen 9 gehalten. Bei weiterer Drehung der Messerwalze 3 schneidet das Messer 4b zusammen mit dem Messer 4c den Abfallstreifen 8 ab. Dieser bleibt an den Saug- und Blasöffnungen 9 haften bis die Saug- und Blasöffnungen von der Saugluftquelle ab- und an die Blasluftquelle angeschlossen sind. Dies geschieht nach wenigstens 1/4 und höchstens 1/2, insbesondere 1/3, Umdrehung der Messerwalze 3 von der Schneidposition aus.In the position of the knife roller 3 shown in FIG. 1, the knife 4a has just cut a sheet 6 with the printed image with the knife 4c from the material web 1, which sheet is removed via a floating table 7. A waste strip 8 which is still to be cut is held by the suction and blowing openings 9 which are subjected to negative pressure. When the knife roller 3 rotates further, the knife 4b cuts off the waste strip 8 together with the knife 4c. This remains attached to the suction and blowing openings 9 until the suction and blowing openings are disconnected from the suction air source and connected to the blowing air source. This happens after at least 1/4 and at most 1/2, in particular 1/3, rotation of the knife roller 3 from the cutting position.

Für die Abführung des abgestoßenen Abfallstreifens 8 ist über der Messerwalze 3 eine Absaughaube 12 angeordnet, die zur Bildung von innenseitig angeordneten Blasluftdüsen 13 mit Förderwirkung in Richtung des Pfeils 11,14 bestückt ist.For the removal of the repelled waste strip 8, a suction hood 12 is arranged above the knife roller 3 and is equipped with a conveying effect in the direction of arrow 11, 14 to form blown air nozzles 13 arranged on the inside.

Zur Unterbringung der Messer 4a,4b und der Saug- und Blasöffnungen 9 weist die Messerwalze 3 Stege 10 auf, an deren Seiten die Messer 4a,4b mittels Schrauben 21 a,21 befestigt sind. Über diese Aussparungen 22 sind die Schrauben 21 a,21 b für Montagezwecke leicht zugänglich. Die Aussparungen 22 sind von Schalen 23 abgedeckt. Die Stege 10 tragen die Saug- und Blasöffnungen 9, die aus Saugnäpfen 9a und sie haltenden, axial durchbohrten Befestigungsschrauben 9b bestehen. Der axiale Kanal der Befestigungsschrauben 9b mündet in den Kanal 17, der seinerseits in eine axiale Nut 16a eines Stabes 15 mündet, der in einer zentralen Bohrung der Messerwalze 3 sitzt. Da beim Ausführungsbeispiel zwei gleichartige Messerpaare diametral gegenüberliegend angeordnet sind, sind zwei axiale Nuten 16a,16b im Stab 15 angeordnet. Sie sind gegeneinander durch in Nuten 18 sitzende, durch einen elastischen Schlauch beaufschlagte Dichtleisten gegeneinander abgedichtet.To accommodate the knives 4a, 4b and the suction and blowing openings 9, the knife roller 3 has webs 10, on the sides of which the knives 4a, 4b are fastened by means of screws 21a, 21. Via these recesses 22, the screws 21 a, 21 b are easily accessible for assembly purposes. The cutouts 22 are covered by shells 23. The webs 10 carry the suction and blowing openings 9, which consist of suction cups 9a and holding, axially pierced fastening screws 9b. The axial channel of the fastening screws 9b opens into the channel 17, which in turn opens into an axial groove 16a of a rod 15 which is seated in a central bore in the knife roller 3. Since two identical pairs of knives are arranged diametrically opposite one another in the exemplary embodiment, two axial grooves 16a, 16b are arranged in the rod 15. They are sealed off from one another by sealing strips which are seated in grooves 18 and acted upon by an elastic hose.

Wie Figur 4 und 5 zeigen, sind stirnseitig an den Enden beider Kanäle 16a,16b Anschlüsse 27a,27b vorgesehen, die dicht an einer stationär angeordneten Verteilerplatte 25a,25b mit einem Ein- 26a und einem Auslaß 26b anliegen. Die Ein-und Auslässe 26a,26b sind gegeneinander derart drehversetzt, daß bei in Schneidposition befindlichen Saug- und Blasöffnungen 9 diese mit den Einlässen 26a für Saugluft (vergl. Figur 4 unten) und die nicht in Schneidposition befindlichen Saug-und Blasöffnungen 9 mit den Auslässen 26b für Blasluft (vergl. Figur 4 oben) verbunden sind. Die Drehversetzung der Ein- und Auslässe 26a,26b ist dabei so getroffen, daß die Abfallstreifen einerseits genügend lange festgehalten und andererseits genügend früh für die Abführung abgeblasen werden. Das kann bedeuten, daß die Ein- und Auslässe 26a,26b nicht diametral gegenüberliegen dürfen.As shown in FIGS. 4 and 5, connections 27a, 27b are provided at the ends at the ends of both channels 16a, 16b, which lie tightly against a stationary distributor plate 25a, 25b with an inlet 26a and an outlet 26b. The inlets and outlets 26a, 26b are rotatably offset from one another in such a way that, when the suction and blowing openings 9 are in the cutting position, they have the inlets 26a for suction air (see FIG. 4 below) and the suction and blowing openings 9 which are not in the cutting position are connected to the Outlets 26b for blown air (see FIG. 4 above) are connected. The rotational displacement of the inlets and outlets 26a, 26b is such that, on the one hand, the waste strips are held long enough and, on the other hand, are blown off sufficiently early for removal. This can mean that the inlets and outlets 26a, 26b must not be diametrically opposite.

Die stationären Verteilerplatten 25a,25b sind an Hohlzapfen 24a,24b angeschraubt, die ihrerseits mit Leitungen an den Saug- und Druckmittelquellen angeschlossen sind. Die stationären Hohlzapfen 24a,24b sind mittels Lager 28a,28b in einem hohlen Lagerzapfen 3a der Messerwalze 3 gelagert. Der zur Abdichtung zwischen der Verteilerplatte 25a und den Anschlüssen 27a,27b notwendige Druck wird durch eine Feder 30 aufgebracht die sich einerseits an einem im Hohlzapfen 3a sitzenden Gewindering 29 und andererseits an dem als Schrägkugellager 28b ausgebildeten, axial fest auf dem Hohlzapfen 24b abstützt.The stationary distributor plates 25a, 25b are screwed onto hollow pins 24a, 24b, which in turn are connected to the suction and pressure medium sources with lines. The stationary hollow pins 24a, 24b are mounted by means of bearings 28a, 28b in a hollow bearing pin 3a of the knife roller 3. The pressure required for sealing between the distributor plate 25a and the connections 27a, 27b is applied by a spring 30 which is supported on the one hand on a threaded ring 29 seated in the hollow pin 3a and on the other hand on the hollow pin 24b designed as an angular contact ball bearing 28b.

Im folgenden werden die Verhältnisse bei einem Querschneider gemäß dem Ausführungsbeispiel mit konkreten Zahlen erläutert:

  • Für Saug- und Blasluft kann jeweils ein Seitenkanalverdichter von 100 mbar Arbeitsdruck eingesetzt werden, wobei etwa ein Druckverlust von 50% durch Widerstände auftritt. Bei einem Querschnitt der Strömungsnuten 16 von jeweils etwa 1 qcm und seinem Volumen einschließlich dem der angeschlossenen Bohrungen 17 von 200 cbcm werden für den Aufbau des Vakuums von 50 mbar unter Normaldruck bei einer Gesamtwiderstandsziffer von 12,5 4 Millisekunden bei abgedeckten und 8 Millisekunden bei freien Saugnäpfen mit 2 mm Bohrung in den Befestigungsschrauben 10 gebraucht. In dieser Zeit beträgt der Weg der Messer 40 bzw. 80 mm entsprechend einem Winkelweg von 22,5 Grad bzw. 45 Grad. Die Zeit des Öffnens und Schließens der Öffnungen von 12,5 mm Durchmesser mit 15 mm exzentrischer Lage dauert bei einem Winkelweg von je 45 Grad 8 Millisekunden. Die Zeit für das Umschalten von Saugen auf Blasen ist somit gerade klein genug, um auf 1/4 Umdrehung der Messerwalze 3 bei 30 Bogen je Sekunde, das entspricht einer Drehzahl von 900 Umdrehungen je Minute, eine störungsfreie Funktion zu gewährleisten.
The following explains the conditions for a cross cutter according to the exemplary embodiment with concrete numbers:
  • A side channel compressor of 100 mbar working pressure can be used for suction and blown air, with a pressure loss of 50% due to resistance. With a cross-section of the flow grooves 16 of about 1 qcm each and its volume including that of the connected bores 17 of 200 cbcm, the vacuum of 50 mbar under normal pressure with a total resistance figure of 12.5 is 4 milliseconds for covered and 8 milliseconds for free Suction cups with 2 mm bore used in the fastening screws 10. During this time, the knife travel is 40 or 80 mm, corresponding to an angular travel of 22.5 degrees or 45 degrees. The opening and closing of the openings of 12.5 mm in diameter with a 15 mm eccentric position takes 8 milliseconds with an angular path of 45 degrees each. The time for switching from suction to bubbles is just short enough to ensure trouble-free operation on 1/4 rotation of the cutter roller 3 at 30 sheets per second, which corresponds to a speed of 900 revolutions per minute.

Bei einer Drehzahl von 900 Umdrehungen je Minute und einem Messerwalzendurchmesser von 210 mm wirkt auf einen 1 m breiten Abfallstreifen mit einem Gewicht von 2g eine Fliehkraft von 180g. Beim gegebenen Beispiel beträgt die Haltekraft an den Saugnäpfen 9a von 10mm innerem Durchmesser in 30mm Teilung 1250g und die Abstoßkraft der Blasöffnungen 9b von 2mm Durchmesser 50g. Diese große Überdimensionierung der Saug- und Haltekraft gibt eine Gewähr dafür, daß der Abfallstreifen 8 nicht durch Untergreifen eines Luftstaus aus der Fördergeschwindigkeit an seiner Vorderkante abgelöst wird, bevor er durch die Saugkraft hinter die schützende Vorderkante bis an die zurückstehenden Saugnäpfe 9a gezogen wird. Dieser störende Luftstau an der Vorderkante des Abfallstreifens 9 läßt sich nicht durch die Blasluft des Schwebetisches 2 zurückdrängen, weil die Blasluft im Spalt durch die Messer 4b,4c versperrt wird. Die vorteilhafte Wirkung der Blasluft tritt erst wieder für die Vorderkante des nachfolgenden Bogens ein.At a speed of 900 revolutions per minute and a knife roller diameter of 210 mm, a centrifugal force of 180 g acts on a 1 m wide waste strip with a weight of 2 g. In the given example, the holding force on the suction cups 9a of 10 mm inner diameter in 30 mm division is 1250 g and the repelling force of the blowing openings 9 b of 2 mm diameter is 50 g. This large overdimensioning of the suction and holding force ensures that the waste strip 8 is not detached from the conveying speed at its front edge by reaching under an air jam before it is pulled by the suction force behind the protective front edge to the recessed suction cups 9a. This disturbing air jam at the front edge of the waste strip 9 cannot be pushed back by the blown air of the floating table 2 because the blown air is blocked in the gap by the knives 4b, 4c. The beneficial effect of the blowing air only occurs again for the leading edge of the following sheet.

Claims (3)

1. Querschneider für mit Druckbildern versehene Materialbahnen, bestehend aus einer mit einem Paar paralleler Messer (4a,4b) bestückten Messerwalze (3) und einem stationär angeordneten Gegenmesser (4c) sowie einer mit Saugluft betriebenen Abführvorrichtung (9,12) für die beim Querschneiden zwischen dem Messerpaar (4a,4b) anfallenden Abfallstreifen (8),
dadurch gekennzeichnet, daß die Abführvorrichtung zwischen den Messern (4a,4b) eines jeden Messerpaares Saug- und Blasöffnungen (9) aufweist, die über mindestens einen durch die Messerwalze (16a,16b,17) verlaufenden Kanal mittels einer Ventilsteuerung (27a,27b,25a,25b,26a,26b) in Abhängigkeit vom Drehwinkel der sich drehenden Messerwalze (3) verbindbar ist, derart, daß die Saug-und Blasöffnungen (9) mit der Saugluftquelle beim Schnitt und mit der Blasluftquelle in einem zur Drehstellung des Schnittes verdrehten Drehbereich verbunden sind, in dem über der Messerwalze (3) eine Absaughaube (12) für die durch die Blasluft abgestoßenen Abfallstreifen (8) angeordnet ist, wobei die Ventilsteuerung (25a,25b,26a,26b,27a,27b) an der Messerwalze (3) angeordnet ist und stationäre, gegeneinander drehversetzte Ein- bzw. Auslässe (26a,26b) der Saug- und Blasluftquelle sowie mindestens einen diese abwechselnd überstreichenden Anschluß (27a,27b) des zu und von den Saug-und Blasöffnungen (9) führenden Kanals (16a,16b,17) aufweist.1. Cross cutter for material webs provided with print images, consisting of a knife roller (3) equipped with a pair of parallel knives (4a, 4b) and a stationary counter knife (4c) as well as a discharge device (9, 12) operated with suction air for cross cutting waste strips (8) occurring between the pair of knives (4a, 4b),
characterized in that the discharge device between the knives (4a, 4b) of each pair of knives has suction and blowing openings (9) which pass through at least one channel running through the knife roller (16a, 16b, 17) by means of a valve control (27a, 27b, 25a, 25b, 26a, 26b) depending on the angle of rotation of the rotating knife roller (3) can be connected in such a way that the suction and blowing openings (9) with the suction air source during cutting and with the blowing air source in a rotating range rotated to the rotational position of the cutting are connected, in which a suction hood (12) for the waste strips (8) repelled by the blown air is arranged above the knife roller (3), the valve control (25a, 25b, 26a, 26b, 27a, 27b) on the knife roller (3 ) is arranged and stationary, rotatably offset inlets and outlets (26a, 26b) of the suction and blown air source as well as at least one alternating connection (27a, 27b) of the to and from the suction and blowing openings (9) leading channel (16a, 16b, 17). 2. Querschneider nach Anspruch 1,
dadurch gekennzeichnet, daß der Einlaß (26b) an der einen Stirnseite der Messerwalze (3) und der Auslaß (26a) an deren anderen Stirnseite angeordnet ist und jeder Kanal (16a,16b) an beiden Stirnseiten einen Anschluß (27a,27b) aufweist.2. cross cutter according to claim 1,
characterized in that the inlet (26b) is arranged on one end face of the knife roller (3) and the outlet (26a) is arranged on the other end face and each channel (16a, 16b) has a connection (27a, 27b) on both end faces. 3. Querschneider nach Anspruch 1,
dadurch gekennzeichnet, daß für die Abfallstreifen (8) zwischen den Messern (4a,4b) und gegenüber ihren Schneiden zurückversetzte Abstützebenen vorgesehen sind.3. cross cutter according to claim 1,
characterized in that for the waste strips (8) between the knives (4a, 4b) and support planes set back with respect to their cutting edges are provided.
EP91111231A 1990-07-21 1991-07-05 Transverse cutter for printed web Expired - Lifetime EP0468254B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4023257 1990-07-21
DE4023257A DE4023257C2 (en) 1990-07-21 1990-07-21 Sheeter for material webs with printed images

Publications (3)

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EP0468254A2 true EP0468254A2 (en) 1992-01-29
EP0468254A3 EP0468254A3 (en) 1992-03-18
EP0468254B1 EP0468254B1 (en) 1995-02-22

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EP91111231A Expired - Lifetime EP0468254B1 (en) 1990-07-21 1991-07-05 Transverse cutter for printed web

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JP (1) JPH0725057B2 (en)
AT (1) ATE118718T1 (en)
DE (2) DE4023257C2 (en)

Cited By (8)

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WO1993023215A1 (en) * 1992-05-18 1993-11-25 Gronbjerg Ib A machine for cutting a paper web into sheets with simultaneous cutting of a transverse strip
EP0586876A1 (en) * 1992-09-05 1994-03-16 Heidelberger Druckmaschinen Aktiengesellschaft Device for a controlled separation of waste from printed material
WO1994014583A1 (en) * 1992-12-24 1994-07-07 Molins Plc Web cutting apparatus
EP0668132A1 (en) * 1994-02-18 1995-08-23 Paper Converting Machine Company Apparatus and method for removal of trim in a saw
WO1995028261A1 (en) * 1994-04-13 1995-10-26 Winkler & Dünnebier Flexible die and supporting cylinder
WO1995033652A1 (en) * 1994-06-08 1995-12-14 Bruno Losi Method and apparatus for the separation of scrap film from adhesive labels
CN105398859A (en) * 2015-12-15 2016-03-16 无锡宝南机器制造有限公司 Rotating cut-off knife air blowing structure of digital book and magazine folding machine
CN114102750A (en) * 2021-12-03 2022-03-01 苏州艾美瑞光电科技有限公司 Punching device and punching method for keyboard light-shielding body

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DE59304886D1 (en) * 1992-10-30 1997-02-06 Grapha Holding Ag Device for producing sheets of the same format from material webs
DE19532027A1 (en) * 1995-08-31 1997-03-06 Koenig & Bauer Albert Ag Method and device for removing trimming strips located on pin needles
EP1125646B1 (en) 2000-02-01 2003-08-06 Heidelberger Druckmaschinen Aktiengesellschaft Means for removing particles from webs
DE10004305A1 (en) * 2000-02-01 2001-08-02 Heidelberger Druckmasch Ag Process for vacuum removal of particles formed by continuous slitting of web material, such as on rotary printing machines
DE102004051143B4 (en) * 2004-10-20 2006-09-21 Maschinenfabrik Wifag Folding device for a rotary web press
DE202015008522U1 (en) * 2015-12-14 2016-01-19 Harro Höfliger Verpackungsmaschinen GmbH Device for extracting subregions from a material web
IT201700081301A1 (en) * 2017-07-18 2019-01-18 Tecnau Srl EQUIPMENT AND TRANSVERSAL CUTTING METHOD FOR TRIMMING STRIPES
CN111531604A (en) * 2020-05-07 2020-08-14 黄碧芳 Automatic pipe cutting machine for plastic processing

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EP0412383A2 (en) * 1989-08-11 1991-02-13 Jos. Hunkeler AG Papierverarbeitungsmaschinen Apparatus for cutting waste out of a running web

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WO1982000970A1 (en) * 1980-09-15 1982-04-01 In Line Inc Blava Apparatus for continuously cutting and removing thin trim strips from a printed web
EP0412383A2 (en) * 1989-08-11 1991-02-13 Jos. Hunkeler AG Papierverarbeitungsmaschinen Apparatus for cutting waste out of a running web

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993023215A1 (en) * 1992-05-18 1993-11-25 Gronbjerg Ib A machine for cutting a paper web into sheets with simultaneous cutting of a transverse strip
US5609084A (en) * 1992-05-18 1997-03-11 Gronbjerg; Ib Machine for cutting a paper web into sheets with simultaneous cutting of a transverse strip
EP0586876A1 (en) * 1992-09-05 1994-03-16 Heidelberger Druckmaschinen Aktiengesellschaft Device for a controlled separation of waste from printed material
US5419224A (en) * 1992-09-05 1995-05-30 Heidelberger Druckmaschinen Ag Device for the controlled removal of pieces of waste material
CN1036903C (en) * 1992-09-05 1998-01-07 海德堡印刷机械股份公司 Apparatus for controlling removal of unqualified pieces of printed matters
WO1994014583A1 (en) * 1992-12-24 1994-07-07 Molins Plc Web cutting apparatus
EP0668132A1 (en) * 1994-02-18 1995-08-23 Paper Converting Machine Company Apparatus and method for removal of trim in a saw
WO1995028261A1 (en) * 1994-04-13 1995-10-26 Winkler & Dünnebier Flexible die and supporting cylinder
WO1995033652A1 (en) * 1994-06-08 1995-12-14 Bruno Losi Method and apparatus for the separation of scrap film from adhesive labels
CN105398859A (en) * 2015-12-15 2016-03-16 无锡宝南机器制造有限公司 Rotating cut-off knife air blowing structure of digital book and magazine folding machine
CN114102750A (en) * 2021-12-03 2022-03-01 苏州艾美瑞光电科技有限公司 Punching device and punching method for keyboard light-shielding body

Also Published As

Publication number Publication date
JPH0725057B2 (en) 1995-03-22
DE4023257A1 (en) 1992-01-23
EP0468254A3 (en) 1992-03-18
JPH04256598A (en) 1992-09-11
DE59104663D1 (en) 1995-03-30
ATE118718T1 (en) 1995-03-15
EP0468254B1 (en) 1995-02-22
DE4023257C2 (en) 1993-12-02

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