EP1724077B1 - Slitter with adjusting means for the upper and lower knives - Google Patents

Slitter with adjusting means for the upper and lower knives Download PDF

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Publication number
EP1724077B1
EP1724077B1 EP06009613A EP06009613A EP1724077B1 EP 1724077 B1 EP1724077 B1 EP 1724077B1 EP 06009613 A EP06009613 A EP 06009613A EP 06009613 A EP06009613 A EP 06009613A EP 1724077 B1 EP1724077 B1 EP 1724077B1
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EP
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Prior art keywords
knife
axial
blade
relative
upper knife
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EP06009613A
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German (de)
French (fr)
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EP1724077A1 (en
Inventor
Hansjörg Klein
Jürgen Rau
Markus Kremer
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Bielomatik Leuze GmbH and Co KG
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Bielomatik Leuze GmbH and Co KG
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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
    • B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
    • B26D7/2628—Means for adjusting the position of the cutting member
    • B26D7/2635—Means for adjusting the position of the cutting member for circular cutters

Definitions

  • the invention relates to a longitudinal cutting device for continuously conveyed material webs, in particular for paper or board webs, with a rotatable upper blade and with a rotatable lower blade and with a feed device, the upper blade and lower blade relative to each other in a cutting position transferred, and a method for delivering a and a lower blade of a slitter relative to each other for a cutting position.
  • Such a longitudinal cutting device is known from DE 34 19 843 A1 known.
  • the known longitudinal cutting device has a rotatable upper blade, which is designed as a circular blade.
  • a rotatable lower blade is provided, which is designed as a pot knife and is provided with a rotary drive.
  • the upper knife is designed as a pointed knife the lower blade so far axially delivered that the two knife edges of the upper and lower blade are pressed against each other in the cutting area. With a corresponding cutting process, this results in a sufficiently good cut quality.
  • the wear, in particular of the cutting region of the upper blade is relatively large, so that a regrinding of the knife edge or replacement of at least one knife may be required.
  • the document EP 1 283 094 A2 discloses the features of the preamble of claim 1.
  • the document DE 19 810 939 A1 describes a delivery unit.
  • the object of the invention is to provide a longitudinal cutting device and a method of the type mentioned, which cause a reduced wear of the knife edges with at least consistently good quality cut.
  • control means which control the feed device such that in the cutting position the upper blade and the lower blade to form a - relative to the axes of rotation of upper and lower blade - axial kerf are positioned contactlessly to each other. Due to the fact that the upper blade and the lower blade have an axial cutting gap relative to one another in the cutting position and are consequently positioned contactlessly relative to one another, wear and tear is prevented by the juxtaposition of the blade blades and any friction between the blade blades. Wear can therefore only be caused by the cutting of the material webs. The wear of the knife is considerably reduced by the solution according to the invention.
  • the axial kerf between the upper blade and the lower blade is preferably smaller than the thickness of the material web to be cut.
  • the solution according to the invention is particularly suitable for longitudinal cutting of paper webs. With the longitudinal cutting device according to the invention, preferably at least six 80 g paper webs can be cut over one another at the same time.
  • the upper blade is preferably designed as a pointed knife.
  • the lower blade is preferably designed as a pot knife, but can also be designed as a sharp knife.
  • the upper blade is adjusted relative to the lower blade.
  • the lower blade can be adjusted relative to a fixed upper blade.
  • the control means are designed so that a delivery of upper blade and lower blade relative to each other is initially made to touch the knife edges together and then the upper blade is reset by a small amount, which corresponds to the width of the kerf.
  • the upper blade and the lower blade are each assigned a rotary drive. This makes it possible to set a suitable cutting speed for both the lower blade and the upper blade, which may differ from the conveying speed of the material web to be cut.
  • the upper blade and the associated rotary drive are mounted on a carriage assembly which is axially displaceable by the Zustellech. As a result, a linear adjustment of the upper blade is ensured in a simple manner.
  • the infeed unit translates a return means acting on the carriage assembly of the upper knife to axially return the upper knife from an abutting position on the lower knife.
  • restoring means may preferably be provided a return spring whose restoring force can be dosed and limited by a hydraulic or pneumatic actuating means.
  • At least one sensor means is provided which detects an abutment position of the upper and lower blades and emits a corresponding signal to the control means, which causes the control means for activating the return means to the upper blade to a predetermined kerf axially from the lower blade remove.
  • a sensor means a displacement sensor or a force sensor can be provided. In the case of a displacement sensor, the exact position and adjustment of the lower blade must be recorded in addition to the travel of the upper blade.
  • the force sensor detects in particular the increased displacement resistance as soon as the upper blade is pressed against the lower blade.
  • the force sensor system must preferably be designed to be relatively sensitive in order not to cause incorrect positioning due to deformation of the upper blade after contact with the lower blade.
  • other types of sensor means are provided, which detect the time of contact of the upper blade on the lower blade and initiate the desired provision to the minor Thomasungspaltbetrag without contact.
  • the axial feed unit of the upper blade and an axial positioning of the lower blade Wegmessgeber are assigned, which are connected to the control means.
  • control means comprise an electronic control unit which evaluates the respective detected position values of the position encoders with respect to a common coordinate system and the feed unit or the return means depending on the result of a comparison with set nominal values for the axial kerf size between upper blade and lower blade controls accordingly.
  • control unit defines a common coordinate system for the axial travel ranges of the upper blade and the lower blade enables automatic and accurate kerf adjustment. Due to this configuration, it is advantageously also possible to set different kerf gaps depending on the driven material webs.
  • motor actuators and / or hydraulic and / or pneumatic actuating cylinders or actuators are provided as adjusting means for the axial adjustment of the upper blade and / or the lower blade.
  • motorized actuators in particular electric servomotors, preferably stepper motors are provided.
  • the object underlying the invention is achieved by a method having the features of claim 5, wherein, for advancing an upper and a lower blade of a longitudinal cutting device with the features of one of claims 1 to 4 relative to each other for a cutting position, instantaneous adjustment positions of the upper blade and the Undercutter are detected, the position detections are assigned to each other via a common frame, and the cutting position between the upper and lower blade is set so that a narrow kerf is present between the upper and lower blade, and wherein the upper blade initially so far delivered axially to the lower blade until the upper blade touches the lower blade, and then the upper blade is displaced back by an axial direction reversal by a small amount corresponding to the kerf to be set.
  • a precise cut gap setting is made possible in a particularly simple manner.
  • a reduction in wear is achieved while still maintaining good quality cut.
  • a longitudinal cutting device 1 serves for cutting continuously conveyed paper webs 2.
  • the longitudinal cutting device 1 has a designed as a pot knife lower blade 3, which rests against the paper web 2 from below.
  • a designed as a tip knife upper blade 4 is provided, which acts from above on the paper web 2.
  • Both the lower blade 3 and the upper blade 4 are each rotatably mounted about a horizontal axis of rotation.
  • the lower blade 3 is a rotary drive 5 and the upper blade 4 is assigned a rotary drive 6.
  • the upper blade 4 is rotatably mounted on a carriage assembly 7, 8, which is axially linearly displaceable by means of a feed unit 9 along a rotational axis.
  • the entire carriage assembly 7, 8 including the feed unit 9 by a lifting drive 14 in the vertical direction hereby a lifting drive 14 in the vertical direction .
  • the slide assembly 7, 8 is axially fixed by a in the present embodiment vertically acting adjusting means in the form of a blocking cylinder 10 on a slide guide SF only schematically shown.
  • the slide guide is arranged in a manner not shown fixed to a machine frame of the slitter 1.
  • the upper blade 4 carrying slide member 7, which is part of the carriage assembly 7, 8 is mounted relative to a settable slide member 8 of the carriage assembly along the axis of rotation of the upper blade 4 axially movable relative.
  • the relative mobility of the slide member 7 relative to the slide member 8 is during an axial movement the entire carriage assembly 7, 8 blocked by a horizontally effective actuator 11, which is designed as a pneumatic actuating cylinder and is pressure-loaded for the rigid transmission of motion between the carriage parts.
  • a return spring 12 In the opposite axial direction to the actuating cylinder 11 acts a return spring 12, which is supported on a rigidly arranged to the slide member 8 slide block of the carriage assembly 7, 8.
  • a mechanical axial stop 13 On the opposite side of the return spring 12, a mechanical axial stop 13 is provided which limits the axially by the return spring 12 exercisable on the bearing carriage 7 movement path and also rigidly connected to the slide member 8.
  • the adjusting cylinders 9 to 11 are designed as pneumatic actuating cylinders, which are controlled by control members which are part of a central control unit S.
  • the core of the central control unit S is a microprocessor comprehensive electronic control, which controls the pneumatic control members and / or additional actuators in the manner described in more detail below.
  • a total of three control lines St 1 , St 2 and St 3 are provided, which extend from the central control unit S to the respective actuating cylinder.
  • the lower blade 3 is rotatably mounted in a manner not shown on a carriage, which is axially linearly adjustable along the axis of rotation of the lower blade 3.
  • a displacement sensor 16 detects the different horizontal positions of the pot knife 3 and directs corresponding position signals via a signal line S 2 to the central control unit S.
  • the entire carriage system 7, 8 for the outer cutter 4 is associated with a Wegmessgeber 15, the corresponding horizontal positions of the carriage system and in particular of the carriage part 8 detected and via a signal line S 1 to the central control unit S directs.
  • the relative movement of the carriage part 7 relative to the carriage part 8 within the overall carriage system is detected by a Wegmessgeber 17, which is also connected via a signal line S 3 to the central control unit S.
  • the pot knife 3 In order to transfer the upper blade 4 and the lower blade 3 in their Thomasstettung in which the at least one paper web 2 is cut, the pot knife 3 is first moved into a defined cutting position.
  • the corresponding cutting position of the lower blade 3 is transmitted via the signal line S 2 of the central control unit S and stored there arithmetically in a common coordinate system for the longitudinal cutting device 1 with corresponding horizontal and Vertikalkoordinaten joke.
  • the upper blade 4 is lowered on the one hand by the lifting drive 14 vertically into a paper web 2 intersecting position.
  • the upper blade 4 is axially - in the illustration after Fig. 1 from the right - the lower knife 3 delivered.
  • the actuating cylinder 11 is pressure-loaded and forms a rigid system between the slide part 8 and the slide part 7.
  • This rigid system is moved axially to the left by the actuating cylinder 9, whereby the upper blade 4 is moved axially in the direction of the lower blade 3.
  • the Wegmessgeber 15 Axialweg and the respective current position of the entire system is detected and compared with the set position of the lower blade 3.
  • the slide member 8 is fixed axially by pressurizing the actuating cylinder 10 and thus acting as a blocking brake for the slide member 8 relative to the frame-fixed slide guide SF.
  • the horizontal actuating cylinder 11 is relieved by being designed in particular without pressure.
  • the formed as a compression spring return spring 12 is effective, which axially resets the slide member 7 in the opposite direction to the feed direction. This inevitably removes the upper blade 4 by a certain amount of axial of the lower blade 3.
  • the carriage part 8 remains in its axially fixed position.
  • the axial return of the slide member 7 may be mechanically limited by the axial stop 13, which is preferably adjustable so that when reaching the end stop 13 automatically the desired axial cutting gap between the cutting tip of the upper blade 4 and the cutting edge of the lower blade 3 is reached.
  • the displacement transducer 17 detects the axially recessed path and transmits it via the signal line S 3 to the central control unit S, so that the central control unit S makes a comparison with a defined and matched to the respective material web to be cut setpoint for the axial kerf and depending on This comparison causes a corresponding control of the actuator.
  • the upper blade 4 is axially displaceable on the one hand together with the entire carriage system and, on the other hand, is also relatively movably resettable relative to the axially fixed slide part of the overall system.
  • a longitudinal cutting device 1a is provided, which is identical to the embodiment according to all essential features Fig. 1 is.
  • Fig. 2 For a more detailed explanation of the longitudinal cutting device 1a according to Fig. 2 Reference is therefore made to the detailed disclosure of the embodiment Fig. 1 directed.
  • Identical parts, portions and regions of the slitter 1a are provided with the same reference numerals as in the slitter 1 after Fig. 1 , Only essential difference in the embodiment according to Fig. 2 It is that here as a lower blade 3a no pot knife, but rather a pointed circular blade is provided analogous to the upper blade 4.
  • the lower blade 3a is provided with a rotary drive 5a which corresponds to the rotary drive 6 of the upper blade 4.
  • Analogous to the also executed as a sharp circular blade upper blade 4 and the lower blade 3a is arranged by a lifting drive 18 in addition to a horizontal Axialverlager pudding liftable to allow immersion in a corresponding paper web or in several, superposed paper webs 2.
  • the axial and thus horizontal adjustability of the lower blade 3a is analogous to the embodiment according to Fig. 1 achieved by a displacement sensor 16 which is provided on the carriage assembly of the lower blade 3a and communicates via a signal line S 2 with the central control unit S.
  • the described embodiments not only lead to consistent, but rather even improved cutting quality over the hitherto known prior art.
  • the upper and / or lower knives designed as pointed knives can be made particularly sharp, since no more wear must be calculated by touching the knives relative to one another. Thinner and therefore sharper knives lead to improved cutting quality.
  • the life of upper blade 4 and lower blade 3, 3a is significantly increased over the prior art.
  • the driving of the upper blade 4 by the rotary drive 6 allows the synchronization of the upper blade 4 or a slight lead over the continuously moving material web, without any contact with the lower blade 3, 3a is present.
  • FIG. 1 and 2 schematically only a knife holder portion for upper blade and lower blade of the longitudinal cutting device is shown, without remaining parts of the slitter are shown. The remaining, not shown parts of the longitudinal cutting device correspond to the prior art.

Abstract

The slitter has a rotatable upper knife and a rotatable lower knife and a setting mechanism, which moves the upper and lower knives relative to each other. A controller (S, St1 to St3, 9 to 11) connects to the setting mechanism in such a way that upper knife (4) and lower knives (3, 3a) are positioned contactlessly to each other. The rotational axle of upper and under knife is arranged with an axial cutting gap. An independent claim is included for a and method.

Description

Die Erfindung betrifft eine Längsschneidvorrichtung für kontinuierlich geförderte Materialbahnen, insbesondere für Papier- oder Kartonbahnen, mit einem rotierbaren Obermesser sowie mit einem rotierbaren Untermesser und mit einer Zustelleinrichtung, die Obermesser und Untermesser relativ zueinander in eine Schnittstellung überführt, sowie ein Verfahren zum Zustellen eines Ober- und eines Untermessers einer Längsschneidvorrichtung relativ zueinander für eine Schnittstellung.The invention relates to a longitudinal cutting device for continuously conveyed material webs, in particular for paper or board webs, with a rotatable upper blade and with a rotatable lower blade and with a feed device, the upper blade and lower blade relative to each other in a cutting position transferred, and a method for delivering a and a lower blade of a slitter relative to each other for a cutting position.

Eine derartige Längsschneidvorrichtung ist aus der DE 34 19 843 A1 bekannt. Die bekannte Längsschneidvorrichtung weist ein rotierbares Obermesser auf, das als Kreismesser gestaltet ist. Zudem ist ein rotierbares Untermesser vorgesehen, das als Topfmesser ausgeführt ist und mit einem Rotationsantrieb versehen ist. Für eine Schnittstellung, in der die entsprechende Materialbahn durch die beiden Messer kontinuierlich durchtrennt wird, wird das als Spitzmesser ausgeführte Obermesser dem Untermesser so weit axial zugestellt, dass die beiden Messerschneiden von Ober- und Untermesser im Schnittbereich gegeneinander gedrückt werden. Bei einem entsprechenden Schneidvorgang ergibt sich hierdurch eine ausreichend gute Schnittqualität. Allerdings ist der Verschleiß insbesondere des Schneidbereiches des Obermessers relativ groß, so dass ein Nachschleifen der Messerschneide oder ein Austausch wenigstens eines Messers erforderlich werden kann.Such a longitudinal cutting device is known from DE 34 19 843 A1 known. The known longitudinal cutting device has a rotatable upper blade, which is designed as a circular blade. In addition, a rotatable lower blade is provided, which is designed as a pot knife and is provided with a rotary drive. For a cutting position in which the corresponding material web is severed continuously by the two knives, the upper knife is designed as a pointed knife the lower blade so far axially delivered that the two knife edges of the upper and lower blade are pressed against each other in the cutting area. With a corresponding cutting process, this results in a sufficiently good cut quality. However, the wear, in particular of the cutting region of the upper blade is relatively large, so that a regrinding of the knife edge or replacement of at least one knife may be required.

Aus der DE 39 38 278 ist eine weitere Längsschneidvorrichtung bekannt, bei der das Zustellen von Untermesser und Obermesser relativ zueinander und das Berühren und/oder Andrücken der Messerschneiden von Obermesser und Untermesser im Schneidbereich gegeneinander unter Zuhilfenahme von Positionsbestimmungen durch entsprechende Stellmittel erfolgt. Zur Positionsbestimmung sind Wegsensoren in Form von Winkelcodierern den Schlittenanordnungen für das Untermesser und das Obermesser zugeordnet.From the DE 39 38 278 a further longitudinal cutting device is known in which the delivery of the lower blade and upper blade relative to each other and the touching and / or pressing the knife edges of the upper blade and lower blade in the cutting area against each other with the aid of position determinations by appropriate actuating means. Position sensors are associated with displacement sensors in the form of angle encoders the slide assemblies for the lower blade and the upper blade.

Das Dokument EP 1 283 094 A2 offenbart die Merkmale des Oberbegriffes des Anspruchs 1. Das Dokument DE 19 810 939 A1 beschreibt eine Zustelleinheit.The document EP 1 283 094 A2 discloses the features of the preamble of claim 1. The document DE 19 810 939 A1 describes a delivery unit.

Aufgabe der Erfindung ist es, eine Längsschneidvorrichtung und ein Verfahren der eingangs genannten Art zu schaffen, die einen reduzierten Verschleiß der Messerschneiden bei wenigstens gleichbleibend guter Schnittqualität bewirken.The object of the invention is to provide a longitudinal cutting device and a method of the type mentioned, which cause a reduced wear of the knife edges with at least consistently good quality cut.

Diese Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst. Für die Längsschneidvorrichtung sind Steuermittel vorgesehen, die die Zustelleinrichtung derart ansteuern, dass in der Schnittstellung das Obermesser und das Untermesser unter Bildung eines ― auf die Rotationsachsen von Ober- und Untermesser bezogen ― axialen Schnittspaltes berührungslos zueinander positioniert sind. Dadurch, dass Obermesser und Untermesser in der Schnittstellung einen axialen Schnittspalt zueinander aufweisen und demzufolge berührungslos zueinander positioniert sind, sind Verschleißerscheinungen durch das Aneinanderliegen der Messerschneiden und etwaigen Reibvorgängen zwischen den Messerschneiden ausgeschlossen. Ein Verschleiß kann daher nur noch durch das Schneiden der Materialbahnen entstehen. Der Verschleiß der Messer wird durch die erfindungsgemäße Lösung erheblich reduziert. Ebenso hat sich gezeigt, dass die Schnittqualität durch die geringfügige Beabstandung der Messer zueinander nicht beeinträchtigt ist, sondern sich gegenüber bekannten Längsschneidvorrichtungen sogar verbessert. Der axiale Schnittspalt zwischen Obermesser und Untermesser ist vorzugsweise geringer als die Dicke der zu schneidenden Materialbahn. Die erfindungsgemäße Lösung eignet sich insbesondere zum Längsschneiden von Papierbahnen. Mit der erfindungsgemäßen Längsschneidvorrichtung können vorzugsweise wenigsten sechs 80g-Papierbahnen übereinanderliegend gleichzeitig geschnitten werden. Das Obermesser ist vorzugsweise als Spitzmesser ausgeführt. Das Untermesser ist vorzugsweise als Topfmesser ausgeführt, kann aber auch als Spitzmesser gestaltet sein. Vorteilhaft wird das Obermesser relativ zu dem Untermesser verstellt. Alternativ kann das Untermesser relativ zu einem feststehenden Obermesser verstellt werden. Schließlich ist es auch möglich, beide Messer verstellbar anzuordnen und aufeinander zuzustellen.This object is solved by the features of claim 1. For the longitudinal cutting device control means are provided which control the feed device such that in the cutting position the upper blade and the lower blade to form a - relative to the axes of rotation of upper and lower blade - axial kerf are positioned contactlessly to each other. Due to the fact that the upper blade and the lower blade have an axial cutting gap relative to one another in the cutting position and are consequently positioned contactlessly relative to one another, wear and tear is prevented by the juxtaposition of the blade blades and any friction between the blade blades. Wear can therefore only be caused by the cutting of the material webs. The wear of the knife is considerably reduced by the solution according to the invention. It has also been found that the quality of cut is not impaired by the slight spacing of the knives relative to each other, but actually improves in comparison to known slitting devices. The axial kerf between the upper blade and the lower blade is preferably smaller than the thickness of the material web to be cut. The solution according to the invention is particularly suitable for longitudinal cutting of paper webs. With the longitudinal cutting device according to the invention, preferably at least six 80 g paper webs can be cut over one another at the same time. The upper blade is preferably designed as a pointed knife. The lower blade is preferably designed as a pot knife, but can also be designed as a sharp knife. Advantageously, the upper blade is adjusted relative to the lower blade. Alternatively, the lower blade can be adjusted relative to a fixed upper blade. Finally, it is also possible to arrange both knives adjustable and zuabressen each other.

Die Steuermittel sind so ausgeführt, dass eine Zustellung von Obermesser und Untermesser relativ zueinander zunächst bis zur Berührung der Messerschneiden aneinander vorgenommen wird und anschließend das Obermesser um einen geringen Betrag wieder zurückgestellt wird, der der Breite des Schnittspaltes entspricht. Gemäß einer nicht erfinderischen Alternative ist es auch möglich, die Axialpositionen von Obermesser und Untermesser exakt zu definieren und Untermesser und Obermesser so weit einander axial zuzustellen, bis lediglich noch der definierte, geringe Schnittspalt zwischen Obermesser und Untermesser verbleibt. Eine Rückstellung des Obermessers ist bei dieser Variante nicht notwendig, da keine Annäherung der Messer zueinander bis zur Berührung erfolgt.The control means are designed so that a delivery of upper blade and lower blade relative to each other is initially made to touch the knife edges together and then the upper blade is reset by a small amount, which corresponds to the width of the kerf. According to a non-inventive alternative, it is also possible to define the axial positions of the upper blade and lower blade exactly and axially deliver lower blade and upper blade each other until only the defined, small kerf remains between upper blade and lower blade. A provision of the upper blade is not necessary in this variant, since no approach of the knife to each other is made to the touch.

In der Erfindung ist dem Obermesser und dem Untermesser jeweils ein Rotationsantrieb zugeordnet. Dadurch ist es möglich, sowohl für das Untermesser als auch für das Obermesser eine geeignete Schnittgeschwindigkeit einzustellen, die von der Fördergeschwindigkeit der zu schneidenden Materialbahn abweichen kann.In the invention, the upper blade and the lower blade are each assigned a rotary drive. This makes it possible to set a suitable cutting speed for both the lower blade and the upper blade, which may differ from the conveying speed of the material web to be cut.

Das Obermesser und der zugeordnete Rotationsantrieb sind auf einer Schlittenanordnung gelagert, die durch die Zustelleinheit axial verlagerbar ist. Dadurch ist in einfacher Weise eine Linearverstellbarkeit des Obermessers gewährleistet.The upper blade and the associated rotary drive are mounted on a carriage assembly which is axially displaceable by the Zustelleinheit. As a result, a linear adjustment of the upper blade is ensured in a simple manner.

Die Zustelleinheit fasst ein Rückstellmittel um, das auf die Schlittenanordnung des Obermessers wirkt, um das Obermesser aus einer Anlageposition an dem Untermesser axial zurückzustellen. Als Rückstellmittel kann vorzugsweise eine Rückstellfeder vorgesehen sein, deren Rückstellkraft durch ein hydraulisches oder pneumatisches Stellmittel dosiert und begrenzt werden kann.The infeed unit translates a return means acting on the carriage assembly of the upper knife to axially return the upper knife from an abutting position on the lower knife. As restoring means may preferably be provided a return spring whose restoring force can be dosed and limited by a hydraulic or pneumatic actuating means.

In weiterer Ausgestaltung der Erfindung ist wenigstens ein Sensormittel vorgesehen, das eine Anlagestellung von Ober- und Untermesser erfasst und ein entsprechendes Signal an die Steuermittel abgibt, das die Steuermittel zur Aktivierung des Rückstellmittels veranlasst, um das Obermesser um einen vorgegebenen Schnittspalt axial von dem Untermesser zu entfernen. Als Sensormittel kann eine Wegsensorik oder auch eine Kraftsensorik vorgesehen sein. Bei einer Wegsensorik muss neben dem Stellweg des Obermessers auch die exakte Position und Verstellung des Untermessers erfasst werden. Die Kraftsensorik erfasst insbesondere den erhöhten Verlagerungswiderstand, sobald das Obermesser gegen das Untermesser gedrückt wird. Die Kraftsensorik muss vorzugsweise relativ feinfühlig ausgelegt sein, um keine Fehlpositionierungen durch eine Deformation des Obermessers nach der Anlage am Untermesser zu bewirken. Bei anderen Ausführungsformen der Erfindung sind andere Arten von Sensormittel vorgesehen, die berührungslos den Zeitpunkt der Anlage des Obermessers am Untermesser erkennen und die gewünschte Rückstellung um den geringfügigen Schnittspaltbetrag in die Wege leiten.In a further embodiment of the invention, at least one sensor means is provided which detects an abutment position of the upper and lower blades and emits a corresponding signal to the control means, which causes the control means for activating the return means to the upper blade to a predetermined kerf axially from the lower blade remove. As a sensor means, a displacement sensor or a force sensor can be provided. In the case of a displacement sensor, the exact position and adjustment of the lower blade must be recorded in addition to the travel of the upper blade. The force sensor detects in particular the increased displacement resistance as soon as the upper blade is pressed against the lower blade. The force sensor system must preferably be designed to be relatively sensitive in order not to cause incorrect positioning due to deformation of the upper blade after contact with the lower blade. In other embodiments of the invention other types of sensor means are provided, which detect the time of contact of the upper blade on the lower blade and initiate the desired provision to the minor Schnittungspaltbetrag without contact.

In weiterer Ausgestaltung der Erfindung sind der axialen Zustelleinheit des Obermessers und einer axialen Positioniereinheit des Untermessers Wegmessgeber zugeordnet, die an die Steuermittel angeschlossen sind. Dadurch ist in besonders bevorzugter Weise eine gewünschte Axialverstellung zwischen Obermesser und Untermesser erzielbar.In a further embodiment of the invention, the axial feed unit of the upper blade and an axial positioning of the lower blade Wegmessgeber are assigned, which are connected to the control means. As a result, a desired axial adjustment between upper blade and lower blade can be achieved in a particularly preferred manner.

In weiterer Ausgestaltung der Erfindung umfassen die Steuermittel eine elektronische Steuereinheit, die die jeweils erfassten Positionswerte der Wegmessgeber in Bezug auf ein gemeinsames Koordinatensystem auswertet und abhängig von dem Ergebnis eines Vergleichs mit eingestellten Sollwerten für die axiale Schnittspaltgröße zwischen Obermesser und Untermesser die Zustelleinheit bzw. das Rückstellmittel entsprechend ansteuert. Dadurch, dass die Steuereinheit ein gemeinsames Koordinatensystem für die axialen Stellwege des Obermessers und des Untermessers definiert, ist eine automatische und genaue Schnittspalteinstellung ermöglicht. Durch diese Ausgestaltung ist es vorteilhaft auch möglich, abhängig von den gefahrenen Materialbahnen unterschiedliche Schnittspalte einzustellen.In a further embodiment of the invention, the control means comprise an electronic control unit which evaluates the respective detected position values of the position encoders with respect to a common coordinate system and the feed unit or the return means depending on the result of a comparison with set nominal values for the axial kerf size between upper blade and lower blade controls accordingly. The fact that the control unit defines a common coordinate system for the axial travel ranges of the upper blade and the lower blade enables automatic and accurate kerf adjustment. Due to this configuration, it is advantageously also possible to set different kerf gaps depending on the driven material webs.

In weiterer Ausgestaltung der Erfindung sind als Stellmittel zur Axialverstellung des Obermessers und/oder des Untermessers motorische Stellantriebe und/oder hydraulische und/oder pneumatische Stellzylinder oder Stellantriebe vorgesehen. Als motorische Stellantriebe sind insbesondere elektrische Stellmotoren, vorzugsweise Schrittmotoren, vorgesehen.In a further embodiment of the invention, motor actuators and / or hydraulic and / or pneumatic actuating cylinders or actuators are provided as adjusting means for the axial adjustment of the upper blade and / or the lower blade. As motorized actuators in particular electric servomotors, preferably stepper motors are provided.

Die der Erfindung zugrundeliegende Aufgabe wird durch ein Verfahren mit den Merkmalen des Anspruchs 5 gelöst, wobei, zum Zustellen eines Ober- und eines Untermessers einer Längsschneidvorrichtung mit den Merkmalen eines der Ansprüche 1 bis 4 relativ zueinander für eine Schnittstellung, momentane Stellpositionen des Obermessers und des Untermessers erfasst werden, wobei die Positionserfassungen einander über ein gemeinsames Bezugssystem zugeordnet werden, und die Schnittstellung zwischen Ober- und Untermesser so eingestellt wird, dass ein schmaler Schnittspalt zwischen Ober- und Untermesser vorhanden ist, und wobei das Obermesser zunächst so weit axial dem Untermesser zugestellt wird, bis das Obermesser das Untermesser berührt, und dass anschließend das Obermesser durch axiale Richtungsumkehr um einen geringen Betrag zurückverlagert wird, der dem einzustellenden Schnittspalt entspricht. Hierdurch wird in besonders einfacher Weise eine genaue Schnittspalteinstellung ermöglicht. Dadurch wird eine Verschleißreduzierung bei dennoch gleichbleibend guter Schnittqualität erzielt.The object underlying the invention is achieved by a method having the features of claim 5, wherein, for advancing an upper and a lower blade of a longitudinal cutting device with the features of one of claims 1 to 4 relative to each other for a cutting position, instantaneous adjustment positions of the upper blade and the Undercutter are detected, the position detections are assigned to each other via a common frame, and the cutting position between the upper and lower blade is set so that a narrow kerf is present between the upper and lower blade, and wherein the upper blade initially so far delivered axially to the lower blade until the upper blade touches the lower blade, and then the upper blade is displaced back by an axial direction reversal by a small amount corresponding to the kerf to be set. As a result, a precise cut gap setting is made possible in a particularly simple manner. As a result, a reduction in wear is achieved while still maintaining good quality cut.

Weitere Vorteile und Merkmale der Erfindung ergeben sich aus den Ansprüchen sowie aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele der Erfindung, die anhand der Zeichnungen dargestellt sind.

Fig. 1
zeigt schematisch eine Ausführungsform einer erfindungsgemäßen Längsschneidvorrichtung mit einem spitzen Kreismesser als Obermesser und einem Topfmesser als Untermesser und
Fig. 2
ebenfalls in schematischer Darstellung eine weitere Ausführungsform einer erfindungsgemäßen Längsschneidvorrichtung ähnlich Fig. 1, bei der sowohl das Obermesser als auch das Untermesser jeweils als spitze Kreismesser ausgeführt sind.
Further advantages and features of the invention will become apparent from the claims and from the following description of preferred embodiments of the invention, which are illustrated by the drawings.
Fig. 1
shows schematically an embodiment of a longitudinal cutting device according to the invention with a pointed circular blade as the upper blade and a pot knife as a lower blade and
Fig. 2
likewise a schematic representation of a further embodiment of a longitudinal cutting device according to the invention similar Fig. 1 in which both the upper blade and the lower blade are each designed as pointed circular blades.

Eine Längsschneidvorrichtung 1 gemäß Fig. 1 dient zum Schneiden kontinuierlich geförderter Papierbahnen 2. Die Längsschneidvorrichtung 1 weist ein als Topfmesser ausgeführtes Untermesser 3 auf, das von unten her an der Papierbahn 2 anliegt. Zudem ist ein als Spitzmesser ausgeführtes Obermesser 4 vorgesehen, das von oben her auf die Papierbahn 2 einwirkt. Sowohl das Untermesser 3 als auch das Obermesser 4 sind jeweils um eine horizontale Rotationsachse rotierbar gelagert. Dem Untermesser 3 ist ein Rotationsantrieb 5 und dem Obermesser 4 ein Rotationsantrieb 6 zugeordnet.A longitudinal cutting device 1 according to Fig. 1 serves for cutting continuously conveyed paper webs 2. The longitudinal cutting device 1 has a designed as a pot knife lower blade 3, which rests against the paper web 2 from below. In addition, a designed as a tip knife upper blade 4 is provided, which acts from above on the paper web 2. Both the lower blade 3 and the upper blade 4 are each rotatably mounted about a horizontal axis of rotation. The lower blade 3 is a rotary drive 5 and the upper blade 4 is assigned a rotary drive 6.

Das Obermesser 4 ist an einer Schlittenanordnung 7, 8 rotierbar gelagert, die mittels einer Zustelleinheit 9 längs zu einer Rotationsachse axial linear verlagerbar ist. Zudem ist die gesamte Schlittenanordnung 7, 8 einschließlich der Zustelleinheit 9 durch einen Hubantrieb 14 in vertikaler Richtung höhenverlagerbar, um ein Eintauchen des Obermessers 4 von oben her in die Papierbahn 2 zu ermöglichen und in entsprechend umgekehrter Weise ein Anheben des Obermessers 4 über die Papierbahn 2 nach oben zu gestatten.The upper blade 4 is rotatably mounted on a carriage assembly 7, 8, which is axially linearly displaceable by means of a feed unit 9 along a rotational axis. In addition, the entire carriage assembly 7, 8 including the feed unit 9 by a lifting drive 14 in the vertical direction höhenverlagerbar to allow immersion of the upper blade 4 from above into the paper web 2 and in a correspondingly reverse manner lifting the upper blade 4 on the paper web. 2 to allow upwards.

Die Schlittenanordnung 7, 8 ist durch ein bei der vorliegenden Ausführungsform vertikal wirkendes Stellmittel in Form eines Blockierzylinders 10 auf einer lediglich schematisch dargestellten Schlittenführung SF axial festsetzbar. Die Schlittenführung ist in nicht näher dargestellter Weise fest an einem Maschinengestell der Längsschneidvorrichtung 1 angeordnet. Der das Obermesser 4 tragende Schlittenteil 7, der Teil der Schlittenanordnung 7, 8 ist, ist relativ zu einem festsetzbaren Schlittenteil 8 der Schlittenanordnung längs der Rotationsachse des Obermessers 4 axial relativbeweglich gelagert. Die Relativbeweglichkeit des Schlittenteiles 7 relativ zu dem Schlittenteil 8 wird während einer Axialbewegung der gesamten Schlittenanordnung 7, 8 durch ein horizontal wirksames Stellelement 11 blockiert, das als pneumatischer Stellzylinder ausgebildet ist und für die starre Bewegungsübertragung zwischen den Schlittenteilen druckbelastet ist. In entgegengesetzter Axialrichtung zu dem Stellzylinder 11 wirkt eine Rückstellfeder 12, die sich an einem starr zu dem Schlittenteil 8 angeordneten Schlittenblock der Schlittenanordnung 7, 8 abstützt. Auf der der Rückstellfeder 12 gegenüberliegenden Seite ist ein mechanischer Axialanschlag 13 vorgesehen, der den durch die Rückstellfeder 12 auf den Lagerschlitten 7 ausübbaren Bewegungsweg axial begrenzt und ebenfalls starr mit dem Schlittenteil 8 verbunden ist.The slide assembly 7, 8 is axially fixed by a in the present embodiment vertically acting adjusting means in the form of a blocking cylinder 10 on a slide guide SF only schematically shown. The slide guide is arranged in a manner not shown fixed to a machine frame of the slitter 1. The upper blade 4 carrying slide member 7, which is part of the carriage assembly 7, 8 is mounted relative to a settable slide member 8 of the carriage assembly along the axis of rotation of the upper blade 4 axially movable relative. The relative mobility of the slide member 7 relative to the slide member 8 is during an axial movement the entire carriage assembly 7, 8 blocked by a horizontally effective actuator 11, which is designed as a pneumatic actuating cylinder and is pressure-loaded for the rigid transmission of motion between the carriage parts. In the opposite axial direction to the actuating cylinder 11 acts a return spring 12, which is supported on a rigidly arranged to the slide member 8 slide block of the carriage assembly 7, 8. On the opposite side of the return spring 12, a mechanical axial stop 13 is provided which limits the axially by the return spring 12 exercisable on the bearing carriage 7 movement path and also rigidly connected to the slide member 8.

Die Stellzylinder 9 bis 11 sind als pneumatische Stellzylinder ausgeführt, die über Steuerglieder angesteuert werden, die Teil einer zentralen Steuereinheit S sind. Kernstück der zentralen Steuereinheit S ist eine einen Mikroprozessor umfassende elektronische Steuerung, die die pneumatischen Steuerglieder und/oder zusätzliche Stellantriebe in nachfolgend näher beschriebener Weise ansteuert.The adjusting cylinders 9 to 11 are designed as pneumatic actuating cylinders, which are controlled by control members which are part of a central control unit S. The core of the central control unit S is a microprocessor comprehensive electronic control, which controls the pneumatic control members and / or additional actuators in the manner described in more detail below.

Zur Ansteuerung der Stellzylinder 9 bis 11 sind insgesamt drei Steuerleitungen St1, St2 und St3 vorgesehen, die von der zentralen Steuereinheit S zu dem jeweiligen Stellzylinder verlaufen.For controlling the actuating cylinders 9 to 11, a total of three control lines St 1 , St 2 and St 3 are provided, which extend from the central control unit S to the respective actuating cylinder.

Das Untermesser 3 ist in nicht näher dargestellter Weise auf einem Schlitten rotierbar gelagert, der längs der Rotationsachse des Untermessers 3 axial linearbeweglich verstellbar ist. Ein Wegsensor 16 erfasst die unterschiedlichen Horizontalpositionen des Topfmessers 3 und leitet entsprechende Positionssignale über eine Signalleitung S2 an die zentrale Steuereinheit S. Dem gesamten Schlittensystem 7, 8 für das Obermesser 4 ist ein Wegmessgeber 15 zugeordnet, der entsprechende Horizontalpositionen des Schlittensystems und insbesondere des Schlittenteils 8 erfasst und über eine Signalleitung S1 an die zentrale Steuereinheit S leitet. Auch die Relativbewegung des Schlittenteiles 7 relativ zu dem Schlittenteil 8 innerhalb des Gesamtschlittensystems wird durch einen Wegmessgeber 17 erfasst, der über eine Signalleitung S3 ebenfalls an die zentrale Steuereinheit S angeschlossen ist.The lower blade 3 is rotatably mounted in a manner not shown on a carriage, which is axially linearly adjustable along the axis of rotation of the lower blade 3. A displacement sensor 16 detects the different horizontal positions of the pot knife 3 and directs corresponding position signals via a signal line S 2 to the central control unit S. The entire carriage system 7, 8 for the outer cutter 4 is associated with a Wegmessgeber 15, the corresponding horizontal positions of the carriage system and in particular of the carriage part 8 detected and via a signal line S 1 to the central control unit S directs. The relative movement of the carriage part 7 relative to the carriage part 8 within the overall carriage system is detected by a Wegmessgeber 17, which is also connected via a signal line S 3 to the central control unit S.

Um das Obermesser 4 und das Untermesser 3 in ihre Schnittstettung zu überführen, in der die wenigstens eine Papierbahn 2 geschnitten wird, wird zunächst das Topfmesser 3 in eine definierte Schnittposition verfahren. Die entsprechende Schnittposition des Untermessers 3 wird über die Signalleitung S2 der zentralen Steuereinheit S übermittelt und dort rechnerisch in einem gemeinsamen Koordinatensystem für die Längsschneidvorrichtung 1 mit entsprechenden Horizontal- und Vertikalkoordinatenwerten gespeichert. Anschließend wird das Obermesser 4 zum einen durch den Hubantrieb 14 vertikal in eine die Papierbahn 2 schneidende Position abgesenkt. Zum anderen wird das Obermesser 4 axial ― in der Darstellung nach Fig. 1 von rechts her ― dem Untermesser 3 zugestellt. Hierzu ist der Stellzylinder 11 druckbelastet und bildet zwischen dem Schlittenteil 8 und dem Schlittenteil 7 ein starres System. Dieses starre System wird durch den Stellzylinder 9 axial nach links bewegt, wodurch auch das Obermesser 4 axial in Richtung des Untermessers 3 bewegt wird. Über den Wegmessgeber 15 wird der Axialweg und die jeweils momentane Position des Gesamtsystems erfasst und mit der eingestellten Position des Untermessers 3 verglichen. Sobald das Obermesser 4 so weit axial verschoben ist, dass es die Schnittkante des Untermessers 3 berührt, wird der Schlittenteil 8 axial festgesetzt, indem der Stellzylinder 10 druckbeaufschlagt wird und so als Blockierbremse für den Schlittenteil 8 relativ zu der gestellfesten Schlittenführung SF wirkt. Nun wird der horizontale Stellzylinder 11 entlastet, indem er insbesondere drucklos gestaltet wird. Hierdurch wird die als Druckfeder ausgebildete Rückstellfeder 12 wirksam, die den Schlittenteil 7 in entgegengesetzter Richtung zur Zustellrichtung axial zurücksetzt. Dadurch entfernt sich zwangsläufig das Obermesser 4 um einen bestimmten Axialbetrag von dem Untermesser 3. Der Schlittenteil 8 verbleibt in seiner axial festgesetzten Position. Die axiale Rückstellung des Schlittenteiles 7 kann mechanisch durch den Axialanschlag 13 begrenzt sein, der vorzugsweise so einstellbar ist, dass mit Erreichen des Endanschlages 13 automatisch der gewünschte axiale Schnittspalt zwischen der Schneidspitze des Obermessers 4 und der Schneidkante des Untermessers 3 erreicht ist. Alternativ ist es möglich, den Stellzylinder 11 durch die Steuerleitung St3 so anzusteuern, dass er die entsprechende Gegenkraft gegen die Rückstellfeder 12 aufbringt und so den entsprechenden axialen Schnittspalt einstellt. Nachteilig hieran ist es, dass es relativ aufwändig ist, den pneumatischen Druck durch den Stellzylinder 11 so gleichmäßig aufrechtzuerhalten, dass eine sichere axiale Blockierung des Lagerschlittens 7 gegen die Druckkraft der Rückstellfeder 12 erreicht ist. Bei einem nicht dargestellten Ausführungsbeispiel ist anstelle des Stellzylinders 11 eine elektromotorische Zustelleinheit vorgesehen. Diese kann mit einem geeigneten, selbsthemmenden Getriebe versehen sein, so dass eine hochgenaue Einstellung des Schnittspaltes erreichbar ist. Bei dieser Ausführungsform ist es auch möglich, auf die Rückstellfeder 12 vollständig zu verzichten.In order to transfer the upper blade 4 and the lower blade 3 in their Schnittstettung in which the at least one paper web 2 is cut, the pot knife 3 is first moved into a defined cutting position. The corresponding cutting position of the lower blade 3 is transmitted via the signal line S 2 of the central control unit S and stored there arithmetically in a common coordinate system for the longitudinal cutting device 1 with corresponding horizontal and Vertikalkoordinatenwerten. Subsequently, the upper blade 4 is lowered on the one hand by the lifting drive 14 vertically into a paper web 2 intersecting position. On the other hand, the upper blade 4 is axially - in the illustration after Fig. 1 from the right - the lower knife 3 delivered. For this purpose, the actuating cylinder 11 is pressure-loaded and forms a rigid system between the slide part 8 and the slide part 7. This rigid system is moved axially to the left by the actuating cylinder 9, whereby the upper blade 4 is moved axially in the direction of the lower blade 3. About the Wegmessgeber 15 Axialweg and the respective current position of the entire system is detected and compared with the set position of the lower blade 3. As soon as the upper blade 4 has been displaced axially so far that it touches the cutting edge of the lower blade 3, the slide member 8 is fixed axially by pressurizing the actuating cylinder 10 and thus acting as a blocking brake for the slide member 8 relative to the frame-fixed slide guide SF. Now, the horizontal actuating cylinder 11 is relieved by being designed in particular without pressure. As a result, the formed as a compression spring return spring 12 is effective, which axially resets the slide member 7 in the opposite direction to the feed direction. This inevitably removes the upper blade 4 by a certain amount of axial of the lower blade 3. The carriage part 8 remains in its axially fixed position. The axial return of the slide member 7 may be mechanically limited by the axial stop 13, which is preferably adjustable so that when reaching the end stop 13 automatically the desired axial cutting gap between the cutting tip of the upper blade 4 and the cutting edge of the lower blade 3 is reached. Alternatively, it is possible to control the actuating cylinder 11 by the control line St 3 so that it applies the corresponding counterforce against the return spring 12 and thus sets the corresponding axial kerf. The disadvantage of this is that it is relatively complicated to maintain the pneumatic pressure by the actuating cylinder 11 so evenly that a secure axial locking of the bearing carriage 7 is achieved against the pressing force of the return spring 12. In an embodiment not shown, an electromotive Zustelleinheit is provided instead of the actuating cylinder 11. This can be provided with a suitable, self-locking gear, so that a highly accurate adjustment of the kerf can be achieved. In this embodiment, it is also possible to completely dispense with the return spring 12.

Der Wegmessgeber 17 erfasst den axial zurückgesetzten Weg und übermittelt diesen über die Signalleitung S3 an die zentrale Steuereinheit S, so dass die zentrale Steuereinheit S einen Vergleich mit einem definierten und auf die jeweils zu schneidende Materialbahn abgestimmten Sollwert für den axialen Schnittspalt vornimmt und abhängig von diesem Vergleich eine entsprechende Ansteuerung des Stellantriebes bewirkt.The displacement transducer 17 detects the axially recessed path and transmits it via the signal line S 3 to the central control unit S, so that the central control unit S makes a comparison with a defined and matched to the respective material web to be cut setpoint for the axial kerf and depending on This comparison causes a corresponding control of the actuator.

Wesentlich bei der dargestellten Ausführungsform ist es, dass das Obermesser 4 zum einen gemeinsam mit dem gesamten Schlittensystem axial verlagerbar ist und zum anderen aber auch relativ zu dem axial festgesetzten Schlittenteil des Gesamtsystems relativ beweglich zurücksetzbar ist.It is essential in the illustrated embodiment that the upper blade 4 is axially displaceable on the one hand together with the entire carriage system and, on the other hand, is also relatively movably resettable relative to the axially fixed slide part of the overall system.

Bei der Ausführungsform nach Fig. 2 ist eine Längsschneidvorrichtung 1a vorgesehen, die bezüglich aller wesentlichen Merkmale identisch zu der Ausführungsform nach Fig. 1 ist. Zur näheren Erläuterung der Längsschneidvorrichtung 1a nach Fig. 2 wird daher auf die ausführliche Offenbarung zur Ausführungsform nach Fig. 1 verwiesen. Identische Teile, Abschnitte und Bereiche der Längsschneidvorrichtung 1a sind mit den gleichen Bezugszeichen versehen wie bei der Längsschneidvorrichtung 1 nach Fig. 1. Einziger wesentlicher Unterschied bei der Ausführungsform nach Fig. 2 ist es, dass hier als Untermesser 3a kein Topfmesser, sondern vielmehr ein spitzes Kreismesser analog dem Obermesser 4 vorgesehen ist. Das Untermesser 3a ist mit einem Rotationsantrieb 5a versehen, der dem Rotationsantrieb 6 des Obermessers 4 entspricht. Analog dem ebenfalls als spitzes Kreismesser ausgeführten Obermesser 4 ist auch das Untermesser 3a durch einen Hubantrieb 18 zusätzlich zu einer horizontalen Axialverlagerbarkeit hubbeweglich angeordnet, um das Eintauchen in eine entsprechende Papierbahn oder in mehrere, übereinanderliegende Papierbahnen 2 zu ermöglichen. Die axiale und damit horizontale Verstellbarkeit des Untermessers 3a wird analog der Ausführungsform nach Fig. 1 durch einen Wegsensor 16 erreicht, der an der Schlittenanordnung des Untermessers 3a vorgesehen ist und über eine Signalleitung S2 mit der zentralen Steuereinheit S in Verbindung steht.In the embodiment according to Fig. 2 a longitudinal cutting device 1a is provided, which is identical to the embodiment according to all essential features Fig. 1 is. For a more detailed explanation of the longitudinal cutting device 1a according to Fig. 2 Reference is therefore made to the detailed disclosure of the embodiment Fig. 1 directed. Identical parts, portions and regions of the slitter 1a are provided with the same reference numerals as in the slitter 1 after Fig. 1 , Only essential difference in the embodiment according to Fig. 2 It is that here as a lower blade 3a no pot knife, but rather a pointed circular blade is provided analogous to the upper blade 4. The lower blade 3a is provided with a rotary drive 5a which corresponds to the rotary drive 6 of the upper blade 4. Analogous to the also executed as a sharp circular blade upper blade 4 and the lower blade 3a is arranged by a lifting drive 18 in addition to a horizontal Axialverlagerbarkeit liftable to allow immersion in a corresponding paper web or in several, superposed paper webs 2. The axial and thus horizontal adjustability of the lower blade 3a is analogous to the embodiment according to Fig. 1 achieved by a displacement sensor 16 which is provided on the carriage assembly of the lower blade 3a and communicates via a signal line S 2 with the central control unit S.

Da das Obermesser 4 und das Untermesser 3a in der Schnittstellung analog der Ausführungsform nach Fig. 1 einen axialen Schnittspalt zueinander aufweisen, kann auch die Überschneidung der spitzen Kreismesser im Schneidbereich stark reduziert werden, da keine Pressung zwischen den Messerschneiden entsteht. Dadurch wird die Verdrängung und Deformation der Papierbahn während des Schneidvorganges reduziert. Vorteilhaft ergibt sich auch eine reduzierte Gratbildung an der Schnittkante der Papierbahn 2. Da keine Messerberührung zwischen Obermesser 4 und Untermesser 3a besteht, kann der Anstellwinkel des Obermessers 4 vergrößert werden. Als Folge entsteht eine verminderte Schnittstaubbildung. Falls der Schnittspalt durch einen Stellantrieb verändert werden kann, ist eine bedarfsgerechte Einstellung des Schnittspaltes auch während des Schneidbetriebs möglich.Since the upper blade 4 and the lower blade 3a in the cutting position analogous to the embodiment according to Fig. 1 Having an axial kerf to each other, and the overlap of the pointed circular blade in the cutting area can be greatly reduced because no pressure between the knife edges. This reduces the displacement and deformation of the paper web during the cutting process. Advantageously, there is also a reduced burr formation at the cutting edge of the paper web 2. Since no knife contact between Upper blade 4 and lower blade 3a, the angle of attack of the upper blade 4 can be increased. As a consequence, reduced dust formation occurs. If the cutting gap can be changed by an actuator, an appropriate adjustment of the kerf is also possible during the cutting operation.

In vorteilhafter Weise führen die beschriebenen Ausführungsformen nicht nur zu gleichbleibender, sondern vielmehr sogar zu verbesserter Schnittqualität gegenüber dem bislang bekannten Stand der Technik. Insbesondere können die als Spitzmesser ausgeführten Ober- und/oder Untermesser besonders spitz ausgeführt werden, da kein Verschleiß durch Berührung der Messer relativ zueinander mehr eingerechnet werden muss. Dünnere und damit spitzere Messer führen zu verbesserter Schnittqualität. Die Lebensdauer von Obermesser 4 und Untermesser 3, 3a wird gegenüber dem Stand der Technik wesentlich erhöht.Advantageously, the described embodiments not only lead to consistent, but rather even improved cutting quality over the hitherto known prior art. In particular, the upper and / or lower knives designed as pointed knives can be made particularly sharp, since no more wear must be calculated by touching the knives relative to one another. Thinner and therefore sharper knives lead to improved cutting quality. The life of upper blade 4 and lower blade 3, 3a is significantly increased over the prior art.

Das Antreiben des Obermessers 4 durch den Rotationsantrieb 6 erlaubt den Gleichlauf des Obermessers 4 oder eine geringe Voreilung gegenüber der kontinuierlich laufenden Materialbahn, ohne dass ein Kontakt mit dem Untermesser 3, 3a vorhanden ist.The driving of the upper blade 4 by the rotary drive 6 allows the synchronization of the upper blade 4 or a slight lead over the continuously moving material web, without any contact with the lower blade 3, 3a is present.

Anhand der Fig. 1 und 2 ist schematisch lediglich ein Messerhalterabschnitt für Obermesser und Untermesser der Längsschneidvorrichtung gezeigt, ohne dass übrige Teile der Längsschneidvorrichtung dargestellt sind. Die übrigen, nicht dargestellten Teile der Längsschneidvorrichtung entsprechen dem Stand der Technik.Based on Fig. 1 and 2 schematically only a knife holder portion for upper blade and lower blade of the longitudinal cutting device is shown, without remaining parts of the slitter are shown. The remaining, not shown parts of the longitudinal cutting device correspond to the prior art.

Claims (5)

  1. Slitter for continuously delivered material webs, in particular for paper or board webs, having a rotatable upper knife and a rotatable lower knife, each of which is assigned a rotational drive (5, 6, 5a), and having an adjusting means which transfers the upper knife (4) and lower knife (3) relative to each other into a cutting position, control means (S, St, St1 to St3; 9-11) being provided which activate the adjusting means in such a way that, in the cutting position, the upper knife (4) and the lower knife (3, 3a) are positioned in relation to each other without contact, forming an axial cutting gap - with respect to the axes of rotation of the upper and lower knives - characterized in that the upper knife (4) and the associated rotational drive (6) are mounted on a carriage arrangement (7, 8) which comprises at least two carriage parts (7. 8) which are movable relative to one another and can be displaced axially by an adjusting unit (9) of the adjusting device, the carriage part (7) bearing the upper knife (4) being mounted such that it can be moved axially along the axis of rotation of the upper knife (4) relative to a carriage part (8) that can be fixed, and the adjusting means comprising a resetting means (12) which acts on the carriage part (7) bearing the upper knife (4) in order to set the upper knife (4) back axially from a contact position on the lower knife, and in that the carriage arrangement (7, 8) has an actuating means (11) which fixes the carriage parts (7, 8) relative to each other or releases them for a relative movement.
  2. Slitter according to Claim 1, characterized in that at least one sensor means (15 to 17) is provided, which registers a contact position of the upper and lower knives (4, 3, 3a) and outputs to the control means (S) a corresponding signal which causes the control means to activate the resetting means (12) in order to move the upper knife (4) axially away from the lower knife (3, 3a) by a predefined cutting gap.
  3. Slitter according to one of the preceding claims, characterized in that the axial adjusting unit of the upper knife and an axial positioning unit of the lower knife are assigned displacement transducers (15, 16), which are connected to the control means.
  4. Slitter according to Claim 3, characterized in that the control means comprise an electronic control unit (S), which evaluates the respectively registered position values from the displacement transducers (15, 16) in relation to a common coordinate system and, depending on the result of a comparison with set desired values for the axial cutting gap size between the upper and lower knives, activates the adjusting unit or the resetting means appropriately.
  5. Method for adjusting an upper and a lower knife of a slitter having the features of one of Claims 1 to 4 relative to each other for a cutting position, instantaneous set positions of the upper knife and of the lower knife being registered, the registrations of position being assigned to each other via a common reference system, and the cutting position between the upper and lower knives (4, 3, 3a) being set in such a way that there is a small axial cutting gap between the upper and lower knives (4, 3, 3a), and the upper knife (4) firstly being adjusted axially towards the lower knife (3) until the upper knife (4) touches the lower knife (3, 3a) and then, by means of an axial reversal of direction, the upper knife (4) being displaced back by a small amount which corresponds to the cutting gap to be set.
EP06009613A 2005-05-17 2006-05-10 Slitter with adjusting means for the upper and lower knives Active EP1724077B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005023720A DE102005023720A1 (en) 2005-05-17 2005-05-17 Slitter with adjuster e.g. for upper and lower knives, has rotatable upper knife and rotatable lower knife and setting mechanism which moves upper and lower knives relative to each other

Publications (2)

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EP1724077A1 EP1724077A1 (en) 2006-11-22
EP1724077B1 true EP1724077B1 (en) 2010-03-31

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EP (1) EP1724077B1 (en)
AT (1) ATE462541T1 (en)
DE (2) DE102005023720A1 (en)
ES (1) ES2343742T3 (en)

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
EP1952956A1 (en) 2007-02-02 2008-08-06 Müller Martini Holding AG Device for cutting printed products fed in an overlapping formation

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DE19810939A1 (en) * 1998-03-13 1999-09-16 Jagenberg Papiertech Gmbh Longitudinal cutting device for moving material webs of paper or cardboard

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JPS5943114U (en) * 1982-09-16 1984-03-21 北海製「あ」株式会社 Blade alignment device in slitting equipment
DE3419843C2 (en) * 1984-05-26 1986-04-03 Jagenberg AG, 4000 Düsseldorf Longitudinal cutting device for web material, in particular paper and cardboard webs
DE3938278C2 (en) * 1989-11-17 1993-12-09 Jagenberg Ag Device for positioning slides or the like which can be moved along guides
GB9414803D0 (en) * 1994-07-22 1994-09-14 Lamberton & Co Ltd Inspection system
DE29620431U1 (en) * 1996-11-23 1997-02-06 Goebel Gmbh Maschf Cutting device
DE19924454B4 (en) * 1999-05-28 2008-09-11 Robert Nyblad Gmbh Device for cutting material webs
DE10037709A1 (en) * 2000-08-02 2002-02-14 Gaemmerler Ag cutter
US6692424B2 (en) * 2001-08-01 2004-02-17 Gammerler Corporation Rotary trimmer apparatus and method
DE10143508A1 (en) * 2001-09-05 2003-03-20 Biforce Anstalt Vaduz Cutting device for cutting food products into slices whereby thickness of cutting gap between cutting knife and cutting edge can be automatically and simply adjusted
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US20040173074A1 (en) * 2003-03-06 2004-09-09 Li Ming M. Apparatus for cutting sheet material

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DE19810939A1 (en) * 1998-03-13 1999-09-16 Jagenberg Papiertech Gmbh Longitudinal cutting device for moving material webs of paper or cardboard

Also Published As

Publication number Publication date
ES2343742T3 (en) 2010-08-09
EP1724077A1 (en) 2006-11-22
DE502006006549D1 (en) 2010-05-12
DE102005023720A1 (en) 2006-11-23
ATE462541T1 (en) 2010-04-15

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