EP1750912A1 - Lame destinee a des installations de coupe rotatives - Google Patents

Lame destinee a des installations de coupe rotatives

Info

Publication number
EP1750912A1
EP1750912A1 EP05749927A EP05749927A EP1750912A1 EP 1750912 A1 EP1750912 A1 EP 1750912A1 EP 05749927 A EP05749927 A EP 05749927A EP 05749927 A EP05749927 A EP 05749927A EP 1750912 A1 EP1750912 A1 EP 1750912A1
Authority
EP
European Patent Office
Prior art keywords
cutting
edge
knife
cutting body
area
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.)
Ceased
Application number
EP05749927A
Other languages
German (de)
English (en)
Inventor
Michael Taffertshofer
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.)
Gramatec GmbH
Original Assignee
Gramatec 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 Gramatec GmbH filed Critical Gramatec GmbH
Publication of EP1750912A1 publication Critical patent/EP1750912A1/fr
Ceased legal-status Critical Current

Links

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
    • B26D1/0006—Cutting members therefor
    • B26D2001/0046—Cutting members therefor rotating continuously about an axis perpendicular to the edge
    • 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
    • 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
    • Y10T83/9319—Toothed blade or tooth therefor
    • Y10T83/9346—Uniformly varying teeth or tooth spacing

Definitions

  • the present invention relates to a cutting knife for rotary cutting systems for cutting paper, in particular isolated paper products in scale formation, according to the preamble of claim 1.
  • printed products such as advertising printed matter or magazines
  • web printing machines for example commercial web offset, newspaper and gravure printing machines.
  • these web printing machines lay out the products in a scale-like manner, lying one above the other on a means of transport, such as a conveyor belt. This means that the products are in the form of a so-called scale on the means of transport.
  • the finished products are created by trimming the head and foot areas and the mostly open long side in further processing lines. Since the printed products are processed without intermediate storage and at full speed, that is, the normal speed of the means of transport, this is referred to as "in-line" processing.
  • the trimming is not carried out by cutting the individual products, but rather by processing a product formation, the so-called scale, in a first cutting machine and after deflecting the scale through 90 ° by means of a so-called corner deflection in a second cutting machine.
  • the high performance of the printing presses requires processing in the shed in order to keep the transport speeds bearable. Trimming in the scale has proven to be the most practical solution, since otherwise a much longer and more complex processing would be necessary.
  • a cutting device for cutting printed products is described in EP 0 450 338 A1, which has a rotating knife disk that works against a counter knife and is provided with several blades.
  • No. 5,197,364 describes a cutting device in which the cutting knife is arranged under the scale, which results in a more favorable force distribution since the resulting force no longer acts only perpendicular to the paper fibers. Such arrangements have been used for some time, but it has been shown that the cut quality is still not the desired one, since a clearly visible tear-out is still produced. In addition, such a cutting device is also cost-intensive because additional measures, such as knife units that can be folded out, are necessary due to the poor accessibility to the main knife arranged below. DE 196 29 561 Cl therefore proposes to arrange cutting knives above and below the scale. However, such a device is even more expensive and complex since the scale is always guided centrally between the cutting knives for good cutting results, which is very difficult due to the different height of the scale in the overlap area and non-overlap area.
  • Cutting knives are provided which are fastened to a clamping arrangement which tapers conically from the hub to the circumference of the knife carrier, the cutting knife ends projecting from the circumference of the knife carrier forming a cutting plane perpendicular to the axis of rotation of the cutting tool.
  • Cutting knives have a clamping cross-section that can be displaced in dovetail-shaped guide grooves and can each be locked in pairs by a clamping plate arranged between them and clampable against the knife carrier.
  • a cutting knife cooperating with a counter knife which has a substantially frustoconical base body, the conical carrying surfaces of which extend perpendicular to the axis of rotation and the blades are arranged on the frustoconical rear surface of the base body and with which Include an angle at the cutting plane.
  • the blades are in different cutting positions slidably mounted and lockable.
  • a knife is known from DE 894 763 C, which is designed as a type of saw blade with additional planing teeth. As a result, the displacement in such a blade-like knife, which has no conical shape, is significantly less.
  • this planer tooth saw blade is, as is also described in the document, intended for cutting wood.
  • such a saw blade is not suitable for cutting paper, since the planing teeth at high throughput speed do not cut the paper on the planing tooth, but rather tear rather than cut, so that the cutting edge does not have the desired quality.
  • a cutting knife for rotary cutting systems for printed products from paper sheets in flake formation or as a single product with an essentially round, disk-shaped cutting body with an axis of rotation arranged essentially in the center of the disk, at the edge of which cutting sections are formed, is described.
  • the cutting sections have at least two different, alternating areas, the first area comprising a sawtooth formed by notching the cutting body and the second area comprising a peeling knife.
  • the peeling cutting edge is conical. This means that the two surfaces of the cutting body converge towards the edge of the cutting body in this area.
  • the cutting body has at least partially a larger radius in the second area than in the first area.
  • the two surfaces of the essentially disk-shaped cutting body form a cutting edge on the edge of the knife, which, when the knife is rotated clockwise, has an edge-free or step-free transition to the tooth in front of it and extends outwards in relation to the circumference of the cutting knife.
  • edge-free or step-free transition to the tooth in front of it and extends outwards in relation to the circumference of the cutting knife.
  • the edge runs outside the circle.
  • a second region which comprises a peeling blade, does not necessarily follow directly in the cutting sections with the region designed as a saw tooth. These two areas alternate. However, this does not mean that the cutting knife has only these two cutting sections. It would also be conceivable that further cutting sections are provided.
  • the cutting knife according to the present invention now acts when arranged above the scale and in a direction of rotation in the direction of conveyance of the scale so that the sawtooth removes material from the chip space and has a force effect from top to bottom.
  • the peeling blade that follows in the cutting knife cuts through one side of the cutting gap due to its conical shape. This pulling cut of the cutting knife gives a particularly good cutting surface.
  • the sawtooth essentially cuts out the volume.
  • the peeling edge on the other hand, only slits a fine notch along the first cut - depending on the arrangement on one or the other cut edge. This side cut surface is very clean and shows no tear.
  • the peeling edge is the only determining factor for the cutting quality on the side on which the cone of the peeling edge runs.
  • the cone of the peeling cutting edge can namely either run to one edge of the thickness of the cutting body of the knife or to the other side. If the peeling blades alternated in their “cone direction”, then both cutting edges could have a very good surface and the cutting knife could be used, for example, to cut so-called middle cut products.
  • All conventional cutting knives produce a product side that is of better quality with regard to the cutting edge and a section side with a very poor surface.
  • good cut surfaces can be produced on both sides.
  • a cutting knife according to the present invention works entirely without lateral displacement forces. Because a volume corresponding to the width of the knife is removed from the material to be cut when cutting. In order to keep this volume small, the knife according to the invention advantageously has the smallest possible thickness. As a result, the cutting edges of the saw teeth also become narrow, which reduces the cutting forces and thus further reduces the risk of the material to be cut tearing.
  • the transition from the saw tooth to the peeling cutting tooth is at least in the area which processes the products during operation, and the peeling knife has an edge which runs obliquely outwards in relation to the circumference of the knife, is also with a variable product throughput speed, the peeling blade is actually always in use and is not “skipped”, as is the case, for example, with devices known from the prior art.
  • the knife known from DE 894 763 it has been shown with the knife known from DE 894 763 that the circumference here Peeling blades are formed, which are concentric on a circular path to the axis of rotation, in order to work "non-kickback". This results in an edge between the sawtooth and the peeling tooth area, which forms a triangular surface when viewed in the running direction of the knife. This area causes paper fibers to tear out as soon as the transport speed of the products increases.
  • the transition from the saw tooth to the peeling tooth is formed as a cutting section. This ensures that the cutting edge is always used, even with variable product throughput speeds, so that a good cutting edge can always be achieved.
  • the cutting knife is designed such that, in a view in which the cutting body rotates clockwise for cutting, the sawtooth is designed such that an edge extending circumferentially on the cutting body forms an angle with the radius of the cutting body Range of 40 to 85 ° and a towards the center of the cutting body The protruding edge to the radius encloses an angle in the range of -10 to 45 °.
  • the peeling cutting edge of the cutting knife according to the invention is advantageously designed such that, in a view in which the cutting body rotates clockwise for cutting, the peeling cutting edge is designed such that an edge extending circumferentially on the cutting body forms an angle with the radius of the cutting body Range of 40 to 85 °, an edge extending towards the center of the cutting body encloses an angle in the range of -30 to 60 ° and a cone angle is in the range of 6 to 30 °.
  • edge extending circumferentially on the cutting body to the radius of the cutting body is designed to be stepless with an angle in the range from 40 to 85 °.
  • the cutting body can be formed essentially in one piece with the cutting sections.
  • the cutting knife is formed such that the thickness of the cutting body outside the cutting areas is in the range from 0.1 to 5 mm.
  • the smallest possible thickness of the cutting knife means that the cutting forces on the printed products can be kept as low as possible.
  • the outer diameter of the cutting body is 50 to 250 mm. Since the cutting knife according to the invention can also have relatively small dimensions, the cutting knife can also be produced very inexpensively. Due to the small total volume of the entire cutting knife, the use of a knife made entirely of hard metal is also economically possible.
  • Figure 1 shows the arrangement of printed products in a scale and the force vectors when cutting according to a method of the prior art
  • Figure 2 shows a cutting knife according to a preferred embodiment of the invention
  • Figure 3 shows an enlarged section B of Figure 2
  • Figure 4 shows a section C-C in Figure 2.
  • a cutting knife 1 according to the invention is shown in FIG.
  • the direction of rotation 2 of such a cutting knife according to the invention is clockwise in the illustration shown.
  • the diameter of this cutting knife is 120 mm.
  • the area B of FIG. 2 was shown enlarged in FIG. 3.
  • the cutting blade is rotated at a relatively high speed of about 24 000 min -1.
  • the saw tooth 3 is followed by a peeling blade 4, 5.
  • the saw tooth 3 is designed such that an edge 9 which extends circumferentially on the cutting body has an angle of approximately 75 ° to the radius of the cutting body and the edge 15 which extends in the direction of the center of the cutting body has an angle ⁇ of approximately 20 °.
  • the cutting knife 1 according to the invention shown also has two different second areas, peeling blades 4, 5, each of which extends conically towards the other side of the thickness D of the cutting knife 1. These peeling blades 4, 5 always alternate. This means that the saw tooth 3 formed as a notch is followed by the peeling blade 4, which is in turn followed by a saw tooth 3 which is followed by the peeling blade 5. According to the preferred embodiment shown, both the edge 8 and the edge 9 are of stepless design.
  • the peeling blade 4, 5 protrudes a little above the sawtooth 3. This is shown with reference number 7 and, according to the preferred embodiment shown, this projection is 0.2 mm. This protrusion means that the peeling blades 4, 5 alone are responsible for the cutting quality.
  • FIG. 4 shows a section CC of FIG. 2, that is to say a section through a peeling blade 4, 5 of the cutting knife 1 according to the invention.
  • the peeling cutting edge 4, 5 according to the preferred embodiment shown is designed such that an edge 8 extending circumferentially on the cutting body 6 forms an angle ⁇ of approximately 70 ° to the radius of the cutting body 6, and an edge 16 extending towards the center of the cutting body 6 encloses an angle ⁇ of approximately 30 ° with the radius and a cone angle ⁇ is approximately 15 ° (see FIG. 4).
  • the section CC from FIG. 4 corresponds to a section through the peeling edge 4. In the case of a section through a peeling edge 5, FIG. 4 would be the same in mirror image.
  • the thickness D of the cutting body 6 is 0.8 mm.

Landscapes

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

Abstract

L'invention concerne une lame destinée à des installations de coupe rotatives destinées aux produits d'impression ou bandes réalisées en matières flexibles comme le papier, le plastique, le tissu, le cuir ou le bois, notamment des produits papier isolés multicouche dans la formation de nappes. Cette lame comprend un corps de coupe en forme de disque sensiblement rond doté d'un axe de rotation situé sensiblement au centre du disque et, sur le bord du disque, des sections de coupe. Les sections de coupe comportent au moins deux zones différentes alternées. La première zone a la forme d'une dent de scie formée par entaille du corps de coupe et la deuxième zone a la forme d'une lame d'écroûtage et rejoint le bord de la lame de manière conique par rapport à l'épaisseur du corps de coupe. Le corps de coupe a, dans la deuxième zone, un rayon au moins partiellement supérieur à celui de la première zone. Dans une vue dans laquelle le corps de coupe tourne dans le sens des aiguilles d'une montre, cette lame doit avoir un bord de la deuxième zone s'étendant sur la circonférence du corps de coupe qui forme avec le rayon du corps de lame former un angle de l'ordre de 40 à 85< DEG > et au moins une section qui touche les produits lors du fonctionnement de la lame, doit avoir un bord coupant.
EP05749927A 2004-04-26 2005-04-26 Lame destinee a des installations de coupe rotatives Ceased EP1750912A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410020256 DE102004020256A1 (de) 2004-04-26 2004-04-26 Schneidmesser für Rotationsschneidanlagen
PCT/DE2005/000763 WO2005102624A1 (fr) 2004-04-26 2005-04-26 Lame destinee a des installations de coupe rotatives

Publications (1)

Publication Number Publication Date
EP1750912A1 true EP1750912A1 (fr) 2007-02-14

Family

ID=34969650

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05749927A Ceased EP1750912A1 (fr) 2004-04-26 2005-04-26 Lame destinee a des installations de coupe rotatives

Country Status (4)

Country Link
US (1) US20070221033A1 (fr)
EP (1) EP1750912A1 (fr)
DE (1) DE102004020256A1 (fr)
WO (1) WO2005102624A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2636961A1 (fr) * 2007-07-11 2009-01-11 Ferag Ag Procede et dispositif de separation de voiles transportes en continu
US10189099B2 (en) 2010-04-22 2019-01-29 Milwaukee Electric Tool Corporation Saw Blade
CA2797111C (fr) 2010-04-22 2015-06-09 Milwaukee Electric Tool Corporation Lame de scie
USD841417S1 (en) 2011-04-22 2019-02-26 Milwaukee Electric Tool Corporation Saw blade
US9370834B2 (en) 2013-03-14 2016-06-21 Irwin Industrial Tool Company Saw blade with feed limiter
BR102016017683B1 (pt) * 2015-07-31 2021-10-05 Dow Agrosciences Llc Sistema / aparelho de corte de semente
EP3625012B1 (fr) 2017-05-16 2022-07-06 Milwaukee Electric Tool Corporation Lame de scie

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE894763C (de) * 1951-07-15 1953-10-26 Lorenz Sedlmayr Hobelzahn-Saegeblatt
SU391919A1 (ru) * 1971-05-10 1973-07-27 Свердловский научно исследовательский институт лесной промышленности Режущий орган
DE2260134C2 (de) * 1972-12-08 1984-05-10 Karl Heinz 5650 Solingen Balke Kreis- oder bogenförmig gestaltetes Maschinenmesser zum Schneiden insbesondere von Brot mit fester Rinde
DE3049147C2 (de) * 1980-12-24 1983-09-15 Johannes Remmert Spezialschleiferei für die Brot-Industrie, 4796 Salzkotten Maschinenmesser, insbesondere kreis- oder bogenförmiger Gestalt
CH660326A5 (de) * 1983-01-13 1987-04-15 Tecno Zuerich Ag Saegeblatt fuer die bearbeitung von holz oder aehnlichen werkstoffen.
DE3719721C3 (de) * 1987-06-12 1996-10-17 Gaemmerler Hagen Schneidmesser für Rotationsschneidanlagen für Papier
CH681363A5 (fr) * 1990-04-02 1993-03-15 Grapha Holding Ag
DE4237762C2 (de) * 1992-11-09 1997-12-18 Elektromechanik Aach Gmbh Sägewerkzeug
DE29510338U1 (de) * 1995-05-30 1995-09-28 Grapha-Holding Ag, Hergiswil Rotierend antreibbares Schneidwerkzeug
DE19629561C2 (de) * 1996-07-22 2003-07-03 Slobodan Djuranovic Segmentmesser für eine Rotationsschneidemaschine, dessen Umfang sich aus einer Vielzahl von Segmenten zusammengesetzt

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005102624A1 *

Also Published As

Publication number Publication date
DE102004020256A1 (de) 2005-11-17
US20070221033A1 (en) 2007-09-27
WO2005102624A1 (fr) 2005-11-03

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