Nothing Special   »   [go: up one dir, main page]

EP0255626A1 - Pair of shaft-blades for cutting web material, particulary corrugated board - Google Patents

Pair of shaft-blades for cutting web material, particulary corrugated board Download PDF

Info

Publication number
EP0255626A1
EP0255626A1 EP87110187A EP87110187A EP0255626A1 EP 0255626 A1 EP0255626 A1 EP 0255626A1 EP 87110187 A EP87110187 A EP 87110187A EP 87110187 A EP87110187 A EP 87110187A EP 0255626 A1 EP0255626 A1 EP 0255626A1
Authority
EP
European Patent Office
Prior art keywords
knife
cutting
pair
knives
teeth
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
EP87110187A
Other languages
German (de)
French (fr)
Other versions
EP0255626B1 (en
Inventor
Manfred Schommler
Gerald Martin
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.)
Peters Maschinenfabrik GmbH
Original Assignee
Peters Maschinenfabrik GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Peters Maschinenfabrik GmbH filed Critical Peters Maschinenfabrik GmbH
Publication of EP0255626A1 publication Critical patent/EP0255626A1/en
Application granted granted Critical
Publication of EP0255626B1 publication Critical patent/EP0255626B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • 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
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/56—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which travels with the work otherwise than in the direction of the cut, i.e. flying cutter
    • B26D1/62—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which travels with the work otherwise than in the direction of the cut, i.e. flying cutter and is rotating about an axis parallel to the line of cut, e.g. mounted on a rotary cylinder
    • B26D1/626—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which travels with the work otherwise than in the direction of the cut, i.e. flying cutter and is rotating about an axis parallel to the line of cut, e.g. mounted on a rotary cylinder for thin material, e.g. for sheets, strips or the like
    • 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
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/0053—Cutting members therefor having a special cutting edge section or blade section
    • 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
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/006—Cutting members therefor the cutting blade having a special shape, e.g. a special outline, serrations
    • 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
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/0066—Cutting members therefor having shearing means, e.g. shearing blades, abutting blades
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/465—Cutting motion of tool has component in direction of moving work
    • Y10T83/4766—Orbital motion of cutting blade
    • Y10T83/4795—Rotary tool
    • Y10T83/4824—With means to cause progressive transverse cutting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/465—Cutting motion of tool has component in direction of moving work
    • Y10T83/4766—Orbital motion of cutting blade
    • Y10T83/4795—Rotary tool
    • Y10T83/483—With cooperating rotary cutter or backup
    • Y10T83/4836—With radial overlap of the cutting members
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9372—Rotatable type
    • Y10T83/9396—Shear type

Definitions

  • the invention relates to a pair of knife shafts for cutting web-like material, in particular corrugated cardboard, in which the knives briefly touch each other shortly before the end of the cutting process, if necessary with pretension.
  • Knife shaft pairs are usually used in cross cutters for corrugated cardboard production plants, in which each shaft pair holds at least one knife with a continuously running cutting edge which is at the same distance from the shaft axis.
  • the knife blade runs either parallel to the shaft axis or it is arranged helically.
  • the helical arrangement has the advantage that only a short section of the cutting edges engages with one another during the cutting process in a single instant, as a result of which the load on the knives, the knife holder and the shafts is kept low.
  • the cutting edges of the knives describe circles that intersect slightly.
  • the cutting edge of one knife lies in the leading area and the other in the trailing area of the knife blade.
  • the circumferential radius of the cutting edge in the trailing area is chosen to be somewhat larger than the radius of the other cutting knife, so that the cutting edges only touch once during a revolution and after this contact the cutting edges move relatively quickly apart.
  • the cutting edges In order to ensure a perfect cut, the cutting edges must be prestressed against each other, ie they lie against each other under a sometimes considerable prestress during contact.
  • the invention is therefore based on the object of providing a pair of knife shafts for cutting web-like material, in particular corrugated cardboard, which enables longer readjustment intervals and a longer service life of the knives.
  • the cutting edge lying on the trailing side of a first knife is formed continuously in a known manner continuously at the same distance from the shaft axis, the other knife has a sawtooth-like cutting edge, the teeth of which start from the continuous line of contact with the First knife away from the shaft of the second knife and in the vicinity of the knife at an acute angle to the connecting plane between the line of contact and continuous cutting edge so that they lie on the trailing or leading side of the knife during the cutting process.
  • sawtooth knives are known per se. You will e.g. used with fly knives. They are also used in so-called short cross-cutters in corrugated cardboard plants.
  • the sawtooth knife sitting on a shaft works together with a volcanic roller, whereby the teeth dig into the counter roller during the cutting process. Since the short cross cutter involves relatively few cutting operations, they can be used satisfactorily in this case. For cross cutters in which several cutting processes take place per second, the interaction of sawtooth knives with a vulcanizing roller would be unacceptable. The volcanic roller would be destroyed in a very short time.
  • a continuous line of contact between the two knives is maintained during the cutting process.
  • the teeth of the sawtooth edge cause a pre-perforation and thus a better distribution of the cutting forces over the cutting area.
  • This can extend over the entire length of the knife shafts, but preferably, as known per se, a helical arrangement of the knives is selected.
  • the pre-perforation also results in a lower crushing effect in horizontal direction, whereby the component load is also reduced in the horizontal direction. Due to the lower cutting forces and thus also their horizontal component, a lower knife preload is required, which in turn reduces the component load.
  • the intervals in which readjustment of the knives is required are extended considerably. Knife wear is also greatly reduced. Maintenance and production interruptions due to readjustment and replacement of the knives can therefore be considerably reduced with the invention.
  • the position of the teeth overlapping the cutting edge of the counter knife with respect to the counter knife depends on which of the two knives is leading. If the counter knife is leading, the teeth lie on the trailing side of the counter knife. If, on the other hand, the sawtooth knife is leading, the teeth lie on the leading side of the counter knife.
  • FIGS. 1 to 3 A knife blade 10 of conventional cross section is shown in FIGS. 1 to 3, with the exception of a sawtooth-shaped cutting edge 11, by which individual teeth 12 are formed, the shape of which can be seen in FIGS. 2 and 3. It can be seen that the teeth 12 are formed by appropriate grinding from an oblique side of the knife blade, which results in triangular teeth and tooth gaps in side view in the contour. As is apparent from FIG. 2, the tooth tips are opposite the right side of the knife blade 10 in FIG. 2, which is the leading one Represents page, offset. The plane in which the teeth extend on this side is inclined by an angle a with respect to the leading side of the knife blade 10.
  • the vertices of the tooth gaps lie on a common continuous line which is parallel to the axis of the knife blade 10 and which is designated by 13 in FIG. 2.
  • a tooth shape according to FIG. 3 results, ie incisions 14 with a triangular cross section are formed.
  • the upper edges of the incisions 14 are formed by straight lines which begin at the tooth tips and converge from there at an acute angle, each between a tooth gap.
  • Knives 20, 21 are attached to knife shafts in a conventional manner.
  • the knives 20, 21 preferably run in a helical shape, so that only a limited length of the cutting edges 22, 23 engages with the corrugated cardboard 24 during the cutting process. This enables the cutting forces to be kept smaller and the wear on the knives to be reduced.
  • the knives 20, 21 are also biased against each other in order to obtain a perfect cutting effect.
  • the knives 20, 21 are provided with open areas 24, 25 in a known manner. In Figures 4 to 6, the direction of corrugated board 24 is from left to right.
  • the lower shaft with the knife 21 rotates in Clockwise while the top shaft rotates counterclockwise.
  • the knives 20, 21 touch the cover surfaces of the corrugated cardboard 24a, a leading edge 26 of the knife 21 being pressed somewhat into the lower cover surface.
  • the corrugated sheets are compressed, and all five sheets of corrugated cardboard 24a are more or less pressed against one another without separation. This is finally finished only when the cutting edges 22, 23 lie against one another under pretension, as shown in FIG. 6.
  • FIG. 7 corresponds in time to the arrangement of the knives in the conventional manner according to FIG. 4.
  • the teeth 12 have already been buried in the upper cover layer and perforate it to have. This is due to the fact that the teeth 12 extend further in the direction of the lower knife with respect to the line of contact 13 between the upper knife 10 and lower knife 21.
  • the teeth form an acute angle with respect to the connecting plane 27 between the lines of contact 13, 23, so that the Teeth 12 are always on the trailing side of the knife 21 during the cutting process (see also FIG. 8).
  • the teeth 12 or the sawtooth-shaped cutting edge 11 formed by them have largely cut through all layers of the corrugated cardboard 24a, but the cutting process also first is then ended when the cutting edge 23 abuts against the line of contact 13.
  • the pretension required for this is far lower than in the case of a knife arrangement according to FIGS. 4 to 6. This is based, as already described, on the far lower cutting forces which can be selected on the basis of the sawtooth-like cutting edge 11.
  • the knives 10, 21 can also be attached to the shaft in a helical manner in a conventional manner.
  • the attachment is conventional.
  • the knife 10 has holes 30 at the ends and recesses 31 on the lower edge for attachment in the knife holder.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Nonmetal Cutting Devices (AREA)
  • Knives (AREA)

Abstract

Messerwellenpaar zum Schneiden von bahnartigem Material, insbesondere Wellpappe, bei dem sich die Messer kurz vor Beendigung des Schneidvorgangs gegebenenfalls unter Vorspannung kurzzeitig berühren, wobei die auf der nacheilenden Seite eines ersten Messers (21) liegende Schneidkante (23) in bekannter Weise als stetig durchgehend mit gleichem Abstand von der Wellenachse ausgebildet ist, das zweite Messer (10) eine sägezahnförmige Schneidkante (11) aufweist, deren Zähne (12) sich ausgehend von der durchgehenden Berührungslinie (13) mit dem ersten Messer (21) von der Welle des zweiten Messers (10) fort und im Annäherungsbereich der Messer (10, 21) in einem spitzen Winkel zur Verbindungsebene (27) zwischen Berührungslinie (13) und stetiger Schneidkante (23) so erstrecken, daß sie während des Schneidvorgangs auf der nacheilenden oder der voreilenden Seite des ersten Messers (21) liegen.A pair of knife shafts for cutting sheet-like material, in particular corrugated cardboard, in which the knives touch briefly shortly before the end of the cutting process, if necessary with prestress, the cutting edge (23) lying on the trailing side of a first knife (21) being known to be continuously continuous in a known manner is the same distance from the shaft axis, the second knife (10) has a sawtooth-shaped cutting edge (11), the teeth (12) of which start from the continuous line of contact (13) with the first knife (21) from the shaft of the second knife ( 10) continue and in the vicinity of the knife (10, 21) at an acute angle to the connecting plane (27) between the line of contact (13) and continuous cutting edge (23) so that they are on the trailing or leading side of the first during the cutting process Knife (21).

Description

Die Erfindung bezieht sich auf ein Messerwellenpaar zum Schneiden von bahnartigem Material, insbesondere Well­pappe, bei dem sich die Messer kurz vor Beendigung des Schneidvorgangs gegebenenfalls unter Vorspannung kurzzeitig berühren.The invention relates to a pair of knife shafts for cutting web-like material, in particular corrugated cardboard, in which the knives briefly touch each other shortly before the end of the cutting process, if necessary with pretension.

In Querschneidern für Wellpappenfertigungsanlagen werden üblicherweise Messerwellenpaare verwendet, bei denen jedes Wellenpaar mindestens ein Messer hält mit einer stetig verlaufenden Schneidkante, die gleichen Abstand von der Wellenachse aufweist. Das Messerblatt verläuft entweder parallel zur Wellenachse oder es ist schraubenlinien­förmig angeordnet. Die schraubenlinienförmige Anordnung hat den Vorteil, daß während des Schneidvorgangs in ei­nem einzigen Augenblick immer nur ein kurzer Abschnitt der Schneidkanten miteinander in Eingriff ist, wodurch die Belastung der Messer, der Messerhalterung und der Wellen gering gehalten wird. Die Schneidkanten der Messer beschreiben Kreise, die sich geringfügig schneiden. Die Schneidkante des einen Messers liegt im voreilenden Be­reich und die andere im nacheilenden Bereich des Messer­blatts. Der Umlaufradius der Schneidkante im nacheilenden Be­reich wird etwas größer gewählt als der Radius des anderen Schneidmessers, so daß nur eine einmalige Berührung der Schneidkanten während eines Umlaufs stattfindet und nach dieser Berührung ein relativ rasches Auseinanderbewegen der Schneidkanten erfolgt. Um einen einwandfreien Schnitt zu gewährleisten, müssen die Schneidkanten gegen­einander vorgespannt sein, d.h. sie liegen während der Berührung unter einer teils erheblichen Vorspannung gegen­einander.Knife shaft pairs are usually used in cross cutters for corrugated cardboard production plants, in which each shaft pair holds at least one knife with a continuously running cutting edge which is at the same distance from the shaft axis. The knife blade runs either parallel to the shaft axis or it is arranged helically. The helical arrangement has the advantage that only a short section of the cutting edges engages with one another during the cutting process in a single instant, as a result of which the load on the knives, the knife holder and the shafts is kept low. The cutting edges of the knives describe circles that intersect slightly. The cutting edge of one knife lies in the leading area and the other in the trailing area of the knife blade. The circumferential radius of the cutting edge in the trailing area is chosen to be somewhat larger than the radius of the other cutting knife, so that the cutting edges only touch once during a revolution and after this contact the cutting edges move relatively quickly apart. In order to ensure a perfect cut, the cutting edges must be prestressed against each other, ie they lie against each other under a sometimes considerable prestress during contact.

Derartige Messerwellenpaare haben sich an sich bewährt. Bei verhältnismäßig zähem Material bzw. ab einer bestimm­ten Grammatur der Wellpappe oder auch bei feuchter oder beschichteter Wellpappe ist eine erhebliche Vorspannung notwendig, um einen einwandfreien Schnitt zu erhalten. Im Grenzfall kommt ein sauberer Schnitt überhaupt nicht zustande. Eine große Vorspannung bedingt hohe Schnitt­kräfte. Hohe Schnittkräfte machen in relativ kurzen Inter­vallen ein Nachstellen der Messer erforderlich, was zu einer unerwünschten Produktionsunterbrechung führt. Hohe Schnittkräfte führen ferner zu einem raschen Verschleiß der Messer.Such knife shaft pairs have proven themselves. In the case of relatively tough material or from a certain grammage of the corrugated cardboard or also in the case of moist or coated corrugated cardboard, there is considerable pretensioning necessary to get a perfect cut. In the borderline case, a clean cut is never achieved. A large preload requires high cutting forces. High cutting forces make it necessary to readjust the knives at relatively short intervals, which leads to an undesirable interruption in production. High cutting forces also lead to rapid wear of the knives.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Messer­wellenpaar zum Schneiden von bahnartigem Material, insbe­sondere Wellpappe, zu schaffen, das längere Nachstellin­tervalle und eine größere Standzeit der Messer ermöglicht.The invention is therefore based on the object of providing a pair of knife shafts for cutting web-like material, in particular corrugated cardboard, which enables longer readjustment intervals and a longer service life of the knives.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die auf der nacheilenden Seite eines ersten Messers liegende Schneidkante in bekannter Weise stetig durchgehend mit gleichem Abstand von der Wellenachse ausgebildet ist, das andere Messer eine sägezahnartige Schneidkante aufweist, deren Zähne sich ausgehend von der durchgehenden Berührungs­linie mit dem ersten Messer von der Welle des zweiten Messers fort und im Annäherungsbereich der Messer in einem spitzen Winkel zur Verbindungsebene zwi­schen Berührungslinie und stetiger Schneidkante so erstrek­ken, daß sie während des Schneidvorgangs auf der nacheilen­den oder voreilenden Seite des Messers liegen.This object is achieved in that the cutting edge lying on the trailing side of a first knife is formed continuously in a known manner continuously at the same distance from the shaft axis, the other knife has a sawtooth-like cutting edge, the teeth of which start from the continuous line of contact with the First knife away from the shaft of the second knife and in the vicinity of the knife at an acute angle to the connecting plane between the line of contact and continuous cutting edge so that they lie on the trailing or leading side of the knife during the cutting process.

Sogenannte Sägezahnmesser sind an sich bekannt. Sie wer­den z.B. bei Schlagmessern eingesetzt. Sie werden auch bei sogenannten Kurzquerschneidern in Wellpappenanlagen verwendet. Das auf einer Welle sitzende Sägezahnmesser wirkt zusammen mit einer Vulkolanwalze, wobei sich wäh­rend des Schneidvorgangs die Zähne in die Gegenwalze ein­graben. Da beim Kurzquerschneider relativ wenige Schneid­vorgänge anfallen,sind sie für diesen Fall zufriedenstel­lend einsetzbar. Für Querschneider, bei denen pro Sekunde mehrere Schnittvorgänge ablaufen, wäre ein Zusammenwirken von Sägezahnmessern mit einer Vulkolanwalze unannehmbar. Die Vulkolanwalze wäre innerhalb kürzester Zeit zerstört.So-called sawtooth knives are known per se. You will e.g. used with fly knives. They are also used in so-called short cross-cutters in corrugated cardboard plants. The sawtooth knife sitting on a shaft works together with a volcanic roller, whereby the teeth dig into the counter roller during the cutting process. Since the short cross cutter involves relatively few cutting operations, they can be used satisfactorily in this case. For cross cutters in which several cutting processes take place per second, the interaction of sawtooth knives with a vulcanizing roller would be unacceptable. The volcanic roller would be destroyed in a very short time.

Beim erfindungsgemäßen Messerwellenpaar bleibt eine durch­gehende Berührungslinie zwischen den beiden Messern wäh­rend des Schneidvorgangs erhalten. Die Zähne der Säge­zahnkante bewirken eine Vorperforation und damit eine bessere Aufteilung der Schnittkräfte über den Schneidbe­reich. Dieser kann sich über die gesamte Länge der Messer­wellen erstrecken, vorzugsweise wird jedoch, wie an sich bekannt, eine schraubenlinienförmige Anordnung der Messer gewählt. Infolge der verringerten Schnittkräfte ist auch eine reduzier­te Radialbelastung auf die Messer, die Messerhalterung und die Messerbalken zu verzeichnen. Durch die Vorperfo­ration erhält man auch einen geringeren Quetscheffekt in horizontaler Richtung, wodurch die Bauteilbelastung auch in horizontaler Richtung geringer wird. Aufgrund der ge­ringeren Schnittkräfte und somit auch deren Horizontal­komponente ist eine geringere Messervorspannung erforder­lich, wodurch wiederum die Bauteilbelastung herabgesetzt wird. Die Intervalle, in denen ein Nachstellen der Messer erforderlich ist, werden erheblich verlängert. Auch der Messerverschleiß wird stark reduziert. Mit der Erfindung können daher Wartungsaufwand und Produktionsunterbrechungen aufgrund von Nachstellarbeiten und Auswechslung der Messer erheblich verringert werden.In the pair of knife shafts according to the invention, a continuous line of contact between the two knives is maintained during the cutting process. The teeth of the sawtooth edge cause a pre-perforation and thus a better distribution of the cutting forces over the cutting area. This can extend over the entire length of the knife shafts, but preferably, as known per se, a helical arrangement of the knives is selected. As a result of the reduced cutting forces, there is also a reduced radial load on the knives, the knife holder and the knife bars. The pre-perforation also results in a lower crushing effect in horizontal direction, whereby the component load is also reduced in the horizontal direction. Due to the lower cutting forces and thus also their horizontal component, a lower knife preload is required, which in turn reduces the component load. The intervals in which readjustment of the knives is required are extended considerably. Knife wear is also greatly reduced. Maintenance and production interruptions due to readjustment and replacement of the knives can therefore be considerably reduced with the invention.

Die Lage der die Schneidkante des Gegenmessers überlappenden Zähne bezüglich des Gegenmessers hängt davon ab, welches der beiden Messer voreilend ist. Ist das Gegenmesser voreilend, liegen die Zähne auf der nacheilenden Seite des Gegenmessers. Ist hingegen das Sägezahnmesser voreilend, liegen die Zähne auf der voreilenden Seite des Gegenmessers.The position of the teeth overlapping the cutting edge of the counter knife with respect to the counter knife depends on which of the two knives is leading. If the counter knife is leading, the teeth lie on the trailing side of the counter knife. If, on the other hand, the sawtooth knife is leading, the teeth lie on the leading side of the counter knife.

Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.Advantageous embodiments of the invention are specified in the subclaims.

Die Erfindung wird nachfolgend anhand von Zeichnungen näher erläutert.

  • Fig. 1 zeigt eine Draufsicht auf ein Messer eines Messerwellenpaares nach der Erfindung.
  • Fig. 2 zeigt einen Schnitt durch das Messer nach Fig. 1 entlang der Linie 2-2.
  • Fig. 3 zeigt eine vergrößerte Seitenansicht der nach­eilenden Seite des Messers nach Fig. 1 in Rich­tung des Pfeils 3 nach Fig. 2.
  • Fign. 4 bis 6 zeigen verschiedene Momente eines Schneid­vorgangs mit einem herkömmlichen Messer­wellenpaar.
  • Fign. 7 und 8 zeigen zwei seitlich voneinander abweichende Momente eines Schneidvorgangs mit dem erfin­dungsgemäßen Messerwellenpaar.
The invention is explained in more detail below with reference to drawings.
  • Fig. 1 shows a plan view of a knife of a pair of knife shafts according to the invention.
  • Fig. 2 shows a section through the knife of FIG. 1 along the line 2-2.
  • 3 shows an enlarged side view of the trailing side of the knife according to FIG. 1 in the direction of arrow 3 according to FIG. 2.
  • Fig. 4 to 6 show different moments of a cutting process with a conventional pair of knife shafts.
  • Fig. 7 and 8 show two laterally differing moments of a cutting process with the pair of knife shafts according to the invention.

Bevor auf die in den Zeichnungen dargestellten Einzelheiten näher eingegangen wird, sei vorangestellt, daß jedes der be­schriebenen Merkmale für sich oder in Verbindung mit Merk­malen der Beschreibung von erfindungswesentlicher Bedeutung ist.Before going into more detail on the details shown in the drawings, it should be assumed that each of the features described is important for the invention, either individually or in conjunction with features of the description.

In den Figuren 1 bis 3 ist ein Messerblatt 10 von herkömmli­chem Querschnitt gezeigt mit Ausnahme einer sägezahnförmigen Schneidkante 11, durch welche einzelne Zähne 12 gebildet sind, deren Form aus den Figuren 2 und 3 hervorgeht. Man er­kennt, daß die Zähne 12 durch entsprechendes Ausschleifen aus einer schrägen Seite des Messerblatts geformt sind, wo­durch sich in Seitenansicht in der Kontur dreieckförmige Zähne und Zahnlücken ergeben. Wie aus Fig. 2 hervorgeht, sind die Zahnspitzen gegenüber der in Fig. 2 rechten Seite des Messerblatts 10, welche die voreilende Seite darstellt, versetzt. Die Ebene, in der sich die Zähne auf dieser Seite erstrecken, ist um einen Winkel a gegenüber der voreilenden Seite des Messerblatts 10 ge­neigt. Die Scheitelpunkte der Zahnlücken liegen auf einer gemeinsamen durchgehenden zur Achse des Messerblatts 10 parallelen Linie, die in Fig. 2 mit 13 bezeichnet ist. In Richtung Pfeil 3 ge­sehen, ergibt sich eine Zahnform gemäß Fig. 3, d.h. es sind Ein­schnitte 14 mit dreieckförmigem Querschnitt geformt. Die oberen Kan­ten der Einschnitte 14 werden von Geraden gebildet, die an den Zahn­spitzen beginnen und von dort spitzwinklig konvergierend zusammenlaufen, und zwar jeweils zwischen einer Zahnlücke.A knife blade 10 of conventional cross section is shown in FIGS. 1 to 3, with the exception of a sawtooth-shaped cutting edge 11, by which individual teeth 12 are formed, the shape of which can be seen in FIGS. 2 and 3. It can be seen that the teeth 12 are formed by appropriate grinding from an oblique side of the knife blade, which results in triangular teeth and tooth gaps in side view in the contour. As is apparent from FIG. 2, the tooth tips are opposite the right side of the knife blade 10 in FIG. 2, which is the leading one Represents page, offset. The plane in which the teeth extend on this side is inclined by an angle a with respect to the leading side of the knife blade 10. The vertices of the tooth gaps lie on a common continuous line which is parallel to the axis of the knife blade 10 and which is designated by 13 in FIG. 2. Viewed in the direction of arrow 3, a tooth shape according to FIG. 3 results, ie incisions 14 with a triangular cross section are formed. The upper edges of the incisions 14 are formed by straight lines which begin at the tooth tips and converge from there at an acute angle, each between a tooth gap.

In den Figuren 4 bis 6 ist ein Schneidvorgang mit einem herkömmlichen Messerwellenpaar dargestellt. Messer 20, 21 sind in herkömmlicher Weise an Messerwellen befestigt. Die Messer 20, 21 verlaufen vorzugsweise schraubenlinien­förmig, so daß während des Schneidvorgangs immer nur eine beschränkte Länge der Schneidkanten 22, 23 mit der Well­pappe 24 in Eingriff ist. Dadurch können die Schnittkräfte kleiner gehalten und der Verschleiß der Messer re­duziert werden. Die Messer 20, 21 sind darüber hinaus ge­geneinander vorgespannt, um einen einwandfreien Schneid­effekt zu erhalten. Die Messer 20, 21 sind in bekannter Weise mit Freiflächen 24, 25 versehen. In den Figuren 4 bis 6 ist die Laufrichtung der Wellpappe 24 von links nach rechts. Die untere Welle mit dem Messer 21 dreht sich im Uhrzeigersinn, während die obere Welle sich entgegenge­setzt dem Uhrzeigersinn dreht. Gemäß der Darstellung nach Fig. 4 berühren die Messer 20, 21 die Deckflächen der Well­pappe 24a,wobei eine voreilende Kante 26 des Messers 21 sich etwas in die untere Deckfläche eindrückt. Bei der Darstellung nach Fig. 5 sind die gewellten Bahnen zusam­mengedrückt, und alle fünf Bahnen der Wellpappe 24a sind mehr oder weniger aufeinandergepreßt, ohne daß eine Trennung vollzogen ist. Diese ist endgültig erst dann beendet, wenn die Schneidkanten 22, 23 unter Vorspannung gegeneinander liegen, wie dies in der Fig. 6 gezeigt ist.A cutting process with a conventional pair of knife shafts is shown in FIGS. Knives 20, 21 are attached to knife shafts in a conventional manner. The knives 20, 21 preferably run in a helical shape, so that only a limited length of the cutting edges 22, 23 engages with the corrugated cardboard 24 during the cutting process. This enables the cutting forces to be kept smaller and the wear on the knives to be reduced. The knives 20, 21 are also biased against each other in order to obtain a perfect cutting effect. The knives 20, 21 are provided with open areas 24, 25 in a known manner. In Figures 4 to 6, the direction of corrugated board 24 is from left to right. The lower shaft with the knife 21 rotates in Clockwise while the top shaft rotates counterclockwise. 4, the knives 20, 21 touch the cover surfaces of the corrugated cardboard 24a, a leading edge 26 of the knife 21 being pressed somewhat into the lower cover surface. 5, the corrugated sheets are compressed, and all five sheets of corrugated cardboard 24a are more or less pressed against one another without separation. This is finally finished only when the cutting edges 22, 23 lie against one another under pretension, as shown in FIG. 6.

Bei dem Messerwellenpaar nach Figuren 7 und 8 ist das untere, voreilende Messer in herkömmlicher Weise ausgebildet, wie in den Figuren 4 bis 6 dargestellt. Das obere Messer ist jedoch das Sägezahnmesser 10 nach den Figuren 1 bis 3. Fig. 7 entspricht zeitlich der Anordnung der Messer in herkömmlicher Weise nach Fig. 4. Man erkennt, daß sich die Zähne 12 bereits in die obere Decklage eingegraben und diese perforierend durchstoßen haben. Dies beruht da­rauf, daß die Zähne 12 sich gegenüber der Berührungslinie 13 zwischen oberem Messer 10 und unterem Messer 21 weiter in Richtung des unteren Messers erstrecken. Die Zähne bilden gegenüber der Verbindungsebene 27 zwischen den Berührungslinien 13, 23 einen spitzen Winkel, so daß die Zähne 12 während des Schneidvorgangs stets auf der nach­eilenden Seite des Messers 21 liegen (siehe auch Fig. 8). Bevor sich die Schneidkante 23 des unteren Messers 21 unter ge­ringerer Vorspannung gegen die durchgehende Linie 13 des oberen Messers 10 anlegt, haben die Zähne 12 bzw. die durch sie gebildete sägezahnförmige Schneidkante 11 alle Lagen der Wellpappe 24a weitgehend durchschnitten, wobei jedoch der Schneidvorgang auch erst dann beendet wird, wenn die Schneidkante 23 gegen die Berührungslinie 13 anliegt. Die hierfür erforderliche Vorspannung ist jedoch weitaus niedriger als bei einer Messeranordnung nach den Figuren 4 bis 6. Dies beruht, wie bereits beschrieben, auf den weitaus geringeren Schnittkräften, die aufgrund der säge­zahnartigen Schneidkante 11 gewählt werden können.In the pair of knife shafts according to FIGS. 7 and 8, the lower, leading knife is designed in a conventional manner, as shown in FIGS. 4 to 6. The upper knife, however, is the sawtooth knife 10 according to FIGS. 1 to 3. FIG. 7 corresponds in time to the arrangement of the knives in the conventional manner according to FIG. 4. It can be seen that the teeth 12 have already been buried in the upper cover layer and perforate it to have. This is due to the fact that the teeth 12 extend further in the direction of the lower knife with respect to the line of contact 13 between the upper knife 10 and lower knife 21. The teeth form an acute angle with respect to the connecting plane 27 between the lines of contact 13, 23, so that the Teeth 12 are always on the trailing side of the knife 21 during the cutting process (see also FIG. 8). Before the cutting edge 23 of the lower knife 21 bears against the continuous line 13 of the upper knife 10 with less pretension, the teeth 12 or the sawtooth-shaped cutting edge 11 formed by them have largely cut through all layers of the corrugated cardboard 24a, but the cutting process also first is then ended when the cutting edge 23 abuts against the line of contact 13. However, the pretension required for this is far lower than in the case of a knife arrangement according to FIGS. 4 to 6. This is based, as already described, on the far lower cutting forces which can be selected on the basis of the sawtooth-like cutting edge 11.

Die Messer 10, 21 können ebenfalls in herkömmlicher Weise schraubenlinienförmig auf der Welle befestigt werden. Die Befestigung ist herkömmlicher Art. Das Messer 10 hat hier­für an den Enden Bohrungen 30 und an der Unterkante Aus­sparungen 31 zur Befestigung im Messerhalter.The knives 10, 21 can also be attached to the shaft in a helical manner in a conventional manner. The attachment is conventional. For this purpose, the knife 10 has holes 30 at the ends and recesses 31 on the lower edge for attachment in the knife holder.

Claims (4)

1. Messerwellenpaar zum Schneiden von bahnartigem Material, insbesondere Wellpappe, bei dem sich die Messer kurz vor Beendigung des Schneidvorgangs gegebenenfalls un­ter Vorspannung kurzzeitig berühren, dadurch gekenn­zeichnet, daß die auf der nacheilenden Seite eines ersten Messers (21) liegende Schneidkante (23) in be­kannter Weise als stetig durchgehend mit gleichem Ab­stand von der Wellenachse ausgebildet ist, das andere Messer (10) eine sägezahnförmige Schneidkante (11) auf­weist, deren Zähne (12) sich ausgehend von der durch­gehenden Berührungslinie (13) mit dem ersten Messer (21) von der Welle des zweiten Messers (10) fort und im An­näherungsbereich der Messer (10, 21) in einem spitzen Winkel zur Verbindungsebene (27) zwischen Berührungs­linie (13) und stetiger Schneidkante (23) so erstrecken, daß sie während des Schneidvorgangs auf der nacheilenden oder der voreilenden Seite des ersten Messers (21) liegen.1. pair of knife shafts for cutting web-like material, in particular corrugated cardboard, in which the knives touch briefly shortly before the end of the cutting process, if necessary under pretension, characterized in that the cutting edge (23) lying on the trailing side of a first knife (21) is known The other knife (10) has a sawtooth-shaped cutting edge (11), the teeth (12) of which, starting from the continuous line of contact (13) with the first knife (21) from the Shaft of the second knife (10) and in the area of approach of the knives (10, 21) at an acute angle to the connecting plane (27) between the contact line (13) and continuous cutting edge (23) so that during the cutting process on the trailing or the leading side of the first knife (21). 2. Messerwellenpaar nach Anspruch 1, dadurch gekennzeichnet, daß die Zähne (12) und die Zahnlücken dreieckig sind.2. pair of knife shafts according to claim 1, characterized in that the teeth (12) and the tooth spaces are triangular. 3. Messerwellenpaar nach Anspruch 1 oder 2, dadurch ge­kennzeichnet, daß die Zähne (12) durch das Einschleifen in eine über die Breite des Messerblatts (10) gehen­de Schrägfläche geformt sind.3. pair of knife shafts according to claim 1 or 2, characterized in that the teeth (12) by grinding are formed into an inclined surface extending across the width of the knife blade (10). 4. Messerwellenpaar nach Anspruch 3, dadurch gekenn­zeichnet, daß die Einschliffe (14) im Querschnitt dreieckförmige Vertiefungen bilden.4. pair of knife shafts according to claim 3, characterized in that the cuts (14) form triangular depressions in cross section.
EP87110187A 1986-08-07 1987-07-15 Pair of shaft-blades for cutting web material, particulary corrugated board Expired - Lifetime EP0255626B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863626748 DE3626748A1 (en) 1986-08-07 1986-08-07 KNIFE SHAFT PAIR FOR CUTTING RAIL-LIKE MATERIAL, IN PARTICULAR CORRUGATED CARDBOARD
DE3626748 1986-08-07

Publications (2)

Publication Number Publication Date
EP0255626A1 true EP0255626A1 (en) 1988-02-10
EP0255626B1 EP0255626B1 (en) 1990-09-12

Family

ID=6306874

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87110187A Expired - Lifetime EP0255626B1 (en) 1986-08-07 1987-07-15 Pair of shaft-blades for cutting web material, particulary corrugated board

Country Status (5)

Country Link
US (1) US4765216A (en)
EP (1) EP0255626B1 (en)
JP (1) JPS63174896A (en)
DE (2) DE3626748A1 (en)
ES (1) ES2017681B3 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2634357B2 (en) * 1992-07-24 1997-07-23 三菱重工業株式会社 Cardboard cut-off device
US7143674B2 (en) * 2001-12-28 2006-12-05 Eastman Kodak Company Imaging element having improved crack propagation during conversion
DE102007012160A1 (en) 2007-03-12 2008-09-18 Stipo Jelica Corrugated card board producing device, has pressure and corrugated rollers, where device produces card board that is used in making folded box whose side panel edges are not placed parallel to corrugation process of cardboard
CN101314231A (en) * 2007-06-01 2008-12-03 深圳市燕加隆实业发展有限公司 Method for processing lock catch of lock catch floor
WO2014119439A1 (en) * 2013-02-04 2014-08-07 株式会社ＴａｎａーＸ Corrugated cardboard blank manufacturing apparatus, and commodity automatic packing system provided therewith

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE177078C (en) * 1900-01-01
US3638522A (en) * 1969-05-06 1972-02-01 Sig Schweiz Industrieges Cutting device with zigzag knife
US4351210A (en) * 1978-11-20 1982-09-28 Zimmer Manufacturing Corp. Shear cut tooth

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3570363A (en) * 1969-12-17 1971-03-16 Wilbur C Thomas Crop shear knife and method of operating same
FR2306773A1 (en) * 1975-04-07 1976-11-05 Comec Const Meca Creil DOUBLE ROTOR SHEARS
JPS5334673A (en) * 1976-09-13 1978-03-31 Kubota Ltd Blowing unit for reactive fluid in heat treatment reactor
JPS56119311A (en) * 1980-02-20 1981-09-18 Mitsubishi Heavy Ind Ltd Drum shear
JPS5835439Y2 (en) * 1980-11-04 1983-08-09 博 水野 cardboard sheet cutting blade
DE3521238A1 (en) * 1985-06-13 1986-12-18 Werner H.K. Peters Maschinenfabrik Gmbh, 2000 Hamburg CROSS-CUTTING MACHINE IN A CARDBOARD PLANT

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE177078C (en) * 1900-01-01
US3638522A (en) * 1969-05-06 1972-02-01 Sig Schweiz Industrieges Cutting device with zigzag knife
US4351210A (en) * 1978-11-20 1982-09-28 Zimmer Manufacturing Corp. Shear cut tooth

Also Published As

Publication number Publication date
EP0255626B1 (en) 1990-09-12
DE3764902D1 (en) 1990-10-18
ES2017681B3 (en) 1991-03-01
JPH0455834B2 (en) 1992-09-04
JPS63174896A (en) 1988-07-19
DE3626748A1 (en) 1988-02-18
US4765216A (en) 1988-08-23
DE3626748C2 (en) 1989-07-13

Similar Documents

Publication Publication Date Title
DE3728352C2 (en)
DE2756911C2 (en)
DE1761098A1 (en) Reinforced, free-running elastic support layer for rotating cutting-punching counter-parts
DE3013617A1 (en) SPLIT SCISSORS FOR PAPER
EP1010503B1 (en) Cutting device including a first and a second row of cutting blades which can be relatively moved along parallel directions
EP0523435B1 (en) Transverse cutter device in folders for web-feb rotary presses
EP0263359B1 (en) Cross cutter
DE3784262T2 (en) DEVICE FOR SMOOTHING VENEER LEAVES.
WO2005102624A1 (en) Cutting knife for rotary cutting installations
EP0255626B1 (en) Pair of shaft-blades for cutting web material, particulary corrugated board
DE1696226A1 (en) Doctor blade
EP0443506B1 (en) Edge protector
CH690323A5 (en) Method and apparatus for cutting continuously demanded, in particular of paper products flochigen.
DE2427594A1 (en) DIVIDING A MULTILAYER BOARD INTO BARS
DE1291188B (en) Cutting knife for a perforation machine
EP0263258B1 (en) Strip steel punch tool with resilient profiled strips
EP0698454A1 (en) Method and device as well as punchknife for making tearing perforations on corrugated paperboard products
EP0519347B1 (en) Process and device for clearing or slitting a rigid sawn article
DE2542908C2 (en) Scissors for cutting scrap material
DE2523203C2 (en) Punching tool
DE1907572A1 (en) Method and device for cutting corrugated cardboard
EP0829198B1 (en) Forage harvester
DE2948634A1 (en) Mower blade for finger bar mowing mechanisms - has top and bottom counter blades for single edged cutting blades
DE19924454B4 (en) Device for cutting material webs
EP1186561A1 (en) Cutting device for cutting a web in a folding machine

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR GB IT NL

17P Request for examination filed

Effective date: 19880129

17Q First examination report despatched

Effective date: 19890621

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES FR GB IT NL

ITF It: translation for a ep patent filed
REF Corresponds to:

Ref document number: 3764902

Country of ref document: DE

Date of ref document: 19901018

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19960604

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19960701

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 19960710

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19960731

Year of fee payment: 10

Ref country code: DE

Payment date: 19960731

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19970715

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19970716

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980201

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19970715

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980331

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 19980201

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980401

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20001204

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050715