EP1510288B1 - Method of sharpening the blades of a rotary cutting machine and rotary cutter for carrying out the method - Google Patents

Method of sharpening the blades of a rotary cutting machine and rotary cutter for carrying out the method Download PDF

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Publication number
EP1510288B1
EP1510288B1 EP20030405621 EP03405621A EP1510288B1 EP 1510288 B1 EP1510288 B1 EP 1510288B1 EP 20030405621 EP20030405621 EP 20030405621 EP 03405621 A EP03405621 A EP 03405621A EP 1510288 B1 EP1510288 B1 EP 1510288B1
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EP
European Patent Office
Prior art keywords
knife
grinding disc
cutting
cutting machine
grinding
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.)
Expired - Lifetime
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EP20030405621
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German (de)
French (fr)
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EP1510288A1 (en
Inventor
Sommer Remo
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Mueller Martini Holding AG
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Mueller Martini Holding AG
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Filing date
Publication date
Application filed by Mueller Martini Holding AG filed Critical Mueller Martini Holding AG
Priority to DE50306512T priority Critical patent/DE50306512D1/en
Priority to EP20030405621 priority patent/EP1510288B1/en
Priority to JP2004247617A priority patent/JP4570923B2/en
Priority to US10/927,187 priority patent/US7083503B2/en
Publication of EP1510288A1 publication Critical patent/EP1510288A1/en
Application granted granted Critical
Publication of EP1510288B1 publication Critical patent/EP1510288B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/08—Means for treating work or cutting member to facilitate cutting
    • B26D7/12—Means for treating work or cutting member to facilitate cutting by sharpening the cutting member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/36—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades
    • B24B3/368—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades installed as an accessory on another machine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/36—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades
    • B24B3/46—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades of disc 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
    • Y10T83/303—With tool sharpener or smoother

Definitions

  • the invention relates to a method for grinding a knife of a rotary cutting machine for the printed products processing industry, wherein a first knife with a first bearing forms a first cutting element and cooperates for the cutting operation with a second knife, which forms a second cutting element with a second cutting element.
  • Rotary cutting machines are used particularly in the printing product processing industry for cutting the open sides of printed products, for example magazines.
  • the cutting takes place in a continuous process whereby the printed products are usually conveyed between two belts in the shingled stream.
  • the rotary cutting machine has an upper blade and a lower blade, also called counter blade on. Between these two blades, the scale flow is cut in a conventional manner.
  • a rotary cutting machine of the applicant that is Upper blade made of a steel blade carrier, on which carbide blades are clamped.
  • the lower blade or counter blade consists of a blade carrier made of steel, on which a ring made of hard metal is glued.
  • the gap between the upper and lower blades should be in a range of, for example, 0.03 to 0.035 mm.
  • the bearings of the two blade shafts may consist of a precision angular contact ball bearing assembly.
  • the adjustment of the lower knife is done via a setting spindle with vernier. When adjusting either a bushing or a carriage is moved on a dovetail guide.
  • the entire cutting element is removed from the rotary cutting machine for regrinding and replaced by a replacement cutting element with sharp blades.
  • the dismantled cutting element and the replacement cutting element respectively comprise the knife and the bearing.
  • the removed cutting element is installed in an external grinding device and there the upper knife is reground. Subsequently, the cutting element is re-installed with the reground upper blade in the rotary cutting machine. Subsequently, the kerf must be readjusted.
  • This method has the advantages that the machine life is comparatively short and that the geometries between the upper blade and the lower blade are preserved since all the components remain in the cutting element. For the user of the rotary cutting machine, however, it is disadvantageous because he is forced to purchase more expensive replacement cutting elements.
  • the pre-published WO 00/69596 discloses a device for sharpening circular leaves having a cutting edge on the circumference, which are ground at the end edge of an annular grinding wheel.
  • the invention has for its object to provide a method of the type mentioned, which allows easier regrinding, especially the upper blade, at a lower cost and still high quality cut.
  • a knife in particular the lower knife, is exchanged by a grinding wheel and the non-exchanged knife is ground therewith.
  • the process takes advantage of the existing high precision bearings of the rotary cutting machine for regrinding.
  • the knife can thus be ground with very high precision. This allows a narrower gap setting and thus a better cutting quality even with a reground knife.
  • the inventive method is particularly suitable for regrinding the upper blade, but in principle, the lower blade or counter blade can be reground by the upper blade is replaced by a grinding wheel.
  • the method is particularly suitable for regrinding an upper knife, which is designed as a segment knife and thus has a plurality of blades on a support.
  • Such segmental upper blades are always ground dry. Since the blades are interrupted due to the segmentation and the surface to be regrind is relatively small, no critical heating takes place and it is therefore not necessary to cool during the grinding process.
  • wet regrinding is also possible with the method according to the invention. Dry regrinding is of course much easier, since no coolant must be supplied.
  • the grinding wheel is connected via an endless drive member with the knife to be ground.
  • the knife is provided to provide the grinding wheel and the knife to be ground with a wheel and in particular a pulley.
  • the pulleys are designed to provide a suitable gear ratio and optimum grinding speed.
  • tungsten carbide the optimum grinding speed of 20 to 25 m / sec. be achieved.
  • As a drive member is particularly suitable a flexible flat belt. For safety reasons or as dust protection can be easily grown a protective cover. With sparks flight is due to the low delivery rate is not expected.
  • the invention also relates to a rotary cutting machine for carrying out the method.
  • the rotary cutting machine 1 shown in Figures 1 and 2 has a machine frame 2, in which a cutting element 5 is mounted, which has an upper blade 6.
  • the cutting element 5 has a shaft, not shown here, which is driven by a motor 3 which is mounted on the machine frame 2.
  • a drive member not shown here, is arranged, which connects the motor with the shaft of the cutting element 5.
  • a mounting plate 13 is arranged, with which the rotary cutting machine 1 can be arranged in a suitable position next to a scale flow or a transport device for such a scale flow.
  • the upper blade 6 is a so-called segment blade and has a disc-shaped carrier 7, on the periphery of a plurality of blades 8 are clamped hard metal.
  • Such outer diameter 6 are known in the art.
  • the cutting element 5 has a in Figure 2 only indicated Bearing 16, which is designed as a precision angular contact ball bearings. In the figure 2, the axis A1 of this bearing 16 is indicated.
  • a pulley 9 is constructed, which is arranged coaxially to the axis A1.
  • a drive belt 10 is placed, which is placed around another pulley 11 of a grinding wheel 12.
  • This grinding wheel 12 is placed on a receptacle 28, on which, according to FIG. 3, the lower blade 20 of a further cutting element 29 is usually seated.
  • This receptacle 28 is connected to a shaft, not shown here, which is mounted in a bearing 17 only indicated in Figure 4.
  • the axis A2 of this shaft is parallel to the axis A1.
  • the receptacle 28 is adjustable on a provided with a vernier knob 18 of a feed device 19 in the directions of the axis A2.
  • the adjustment takes place in a conventional manner, in particular via an adjusting spindle.
  • a sleeve or a carriage is moved on a dovetail guide. It is thus possible along the axis A2 a very precise delivery of the grinding wheel 12.
  • the grinding wheel 12 has, according to FIG. 2, a flat inner side 15 which can be placed in an upper area against a lower area of an inner side 14 of the upper blade 6. If the upper blade 6 is rotated about the axis A1 with the motor 3, the grinding wheel 12 simultaneously rotates about the axis A2, since the drive belt 10 connects the upper blade 6 with the grinding wheel 12. Since now the pulley 11 has a substantially smaller diameter than the pulley 9, the grinding wheel 12 rotates much faster than the upper blade. 6
  • the gear ratio is chosen to give an optimum grinding speed that is in the case of blades 8 made of hard metal in the range of 20 to 25 m / sec. lies.
  • the lower blade 20 is removed and thus removed from the receptacle 28.
  • the grinding wheel 12 is placed on the receptacle 28 and rotatably connected thereto.
  • the pulley 11 is already sitting on the grinding wheel 12.
  • the pulley 9 is attached to the upper blade 6.
  • a protective cover not shown here, is attached, which covers in particular the upper blade 6.
  • the motor 3 is switched on, so that now the upper blade 6 and the grinding wheel 12 are driven. Due to the above-mentioned translation, the relative rotational speed corresponds to the optimum grinding speed.
  • the grinding wheel 12 is now delivered until the inner side 15 of the grinding wheel 12 bears against surfaces of the blades 8.
  • the regrinding time depends on how severely the blades 8 are worn.
  • the grinding wheel 12 is readjusted, for example, by about 1/100 mm and then ground for about one minute. This process is repeated until the blades 8 have the required quality. After the last delivery, for example, 10 minutes must be ground.
  • the grinding wheel 12 is exchanged for the lower blade 20.
  • the drive belt 10 and the two pulleys 9 and 11 are removed here. After adjusting the kerf, the rotary cutting machine 1 is ready for further production.
  • the aforementioned regrinding can be done dry because the blades are interrupted due to the segmentation and no critical heating takes place. If the upper blade 6 is not such a segment blade, a wet regrinding with suitable coolant is basically possible.
  • the regrinding is carried out with high precision, since the high precision of the bearings of the cutting elements with the backlash-free adjustment is also used for regrinding.
  • the cutting gap can thus be set optimally small even after regrinding, resulting in excellent cutting results.
  • the method is also applicable for grinding the lower blade 20.
  • the upper blade 6 is replaced by the grinding wheel 21 shown in FIGS. 3 and 4.
  • the grinding wheel 21 is driven directly by the motor 3 accordingly.
  • a pulley 23 is placed, which is connected via the drive belt 10 with the pulley 22.
  • the translation is chosen so that there is an optimal cutting speed.
  • the nachzuschleifende lower blade 20 consists of a carrier 26, on which a ring 27 is cemented from hard metal. According to FIG. 4, this ring 27 has an inner side 25 on which, during regrinding, a plane inner side 24 of FIG Grinding wheel 21 is applied.
  • the lower blade 20 is delivered by turning the knob 18.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Schleifen eines Messers einer Rotationsschneidemaschine für die Druckprodukte verarbeitende Industrie, wobei ein erstes Messer mit einem ersten Lager ein erstes Schneidelement bildet und für den Schneidvorgang mit einem zweiten Messer zusammenarbeitet, das mit einem zweiten Lager ein zweites Schneidelement bildet.The invention relates to a method for grinding a knife of a rotary cutting machine for the printed products processing industry, wherein a first knife with a first bearing forms a first cutting element and cooperates for the cutting operation with a second knife, which forms a second cutting element with a second cutting element.

Rotationsschneidemaschinen werden insbesondere in der Druckprodukte verarbeitenden Industrie zum Schneiden der offenen Seiten von Druckprodukten, beispielsweise Zeitschriften verwendet. Das Schneiden erfolgt im Durchlauf, wobei die Druckprodukte in der Regel zwischen zwei Bändern im Schuppenstrom gefördert werden. Der Rotationsschneidemaschine weist ein Obermesser und ein Untermesser, auch Gegenmesser genannt, auf. Zwischen diesen beiden Messern wird der Schuppenstrom in an sich bekannter Weise geschnitten.Rotary cutting machines are used particularly in the printing product processing industry for cutting the open sides of printed products, for example magazines. The cutting takes place in a continuous process whereby the printed products are usually conveyed between two belts in the shingled stream. The rotary cutting machine has an upper blade and a lower blade, also called counter blade on. Between these two blades, the scale flow is cut in a conventional manner.

Bei einer Rotationsschneidemaschine der Anmelderin besteht das Obermesser aus einem Messerträger aus Stahl, auf dem Hartmetallklingen aufgeklemmt sind. Das Untermesser bzw. Gegenmesser besteht aus einem Messerträger aus Stahl, auf dem ein Ring aus Hartmetall aufgeklebt ist. Um ein optimales Schneidergebnis erreichen zu können, sollte sich der Spalt zwischen Ober- und Untermesser in einem Bereich von beispielsweise 0,03 bis 0,035 mm bewegen. Die Lagerungen der beiden Messerwellen kann aus einer Präzisions-Schrägkugellageranordnung bestehen. Die Verstellung des Untermessers erfolgt über eine Stellspindel mit Nonius. Beim Verstellen wird entweder eine Büchse oder ein Schlitten auf einer Schwalbenschwanzführung verschoben.In a rotary cutting machine of the applicant that is Upper blade made of a steel blade carrier, on which carbide blades are clamped. The lower blade or counter blade consists of a blade carrier made of steel, on which a ring made of hard metal is glued. In order to achieve an optimum cutting result, the gap between the upper and lower blades should be in a range of, for example, 0.03 to 0.035 mm. The bearings of the two blade shafts may consist of a precision angular contact ball bearing assembly. The adjustment of the lower knife is done via a setting spindle with vernier. When adjusting either a bushing or a carriage is moved on a dovetail guide.

Bei einem Nachlassen der Schnittqualität wird in der Regel das Obermesser nachgeschliffen. Das Untermesser nützt sich aufgrund seiner Geometrie nur sehr wenig ab. Zum Nachschleifen des Obermessers waren bisher die folgenden beiden Verfahren üblich:If the quality of the cut decreases, the upper knife is reground as a rule. The lower blade is due to its geometry only very little. For regrinding the upper knife, the following two methods have hitherto been customary:

Bei dem einen Verfahren wird zum Nachschleifen das gesamte Schneidelement aus der Rotationsschneidemaschine ausgefahren und durch ein Ersatzschneidelement mit scharfen Klingen ersetzt. Das ausgebaute Schneidelement und das Ersatzschneidelement umfassen jeweils das Messer und die Lagerung. Das ausgebaute Schneidelement wird in eine externe Schleifvorrichtung eingebaut und dort wird das Obermesser nachgeschliffen. Anschliessend wird das Schneidelement mit dem nachgeschliffenen Obermesser wieder in die Rotationsschneidemaschine eingebaut. Anschliessend muss der Schnittspalt neu eingestellt werden. Dieses Verfahren hat die Vorteile, dass die Maschinenstandzeit vergleichsweise kurz ist und dass die Geometrien zwischen dem Obermesser und dem Untermesser erhalten bleiben, da alle Komponenten im Schneidelement verbleiben. Für den Benutzer der Rotationsschneidemaschine ist es jedoch nachteilig, da er gezwungen ist, teurere Ersatzschneidelemente anzuschaffen.In one method, the entire cutting element is removed from the rotary cutting machine for regrinding and replaced by a replacement cutting element with sharp blades. The dismantled cutting element and the replacement cutting element respectively comprise the knife and the bearing. The removed cutting element is installed in an external grinding device and there the upper knife is reground. Subsequently, the cutting element is re-installed with the reground upper blade in the rotary cutting machine. Subsequently, the kerf must be readjusted. This method has the advantages that the machine life is comparatively short and that the geometries between the upper blade and the lower blade are preserved since all the components remain in the cutting element. For the user of the rotary cutting machine, however, it is disadvantageous because he is forced to purchase more expensive replacement cutting elements.

Beim anderen Verfahren wird lediglich das Obermesser aus der Rotationsschneidemaschine ausgebaut und durch ein geschliffenes Obermesser ersetzt. Nach dem Austausch muss der Schnittspalt wieder eingestellt werden. Anschliessend kann die Produktion wieder aufgenommen werden. Das zu schleifende Obermesser wird separat auf einem Schleifaggregat oder bei einer externen Firma nachgeschliffen. Der Vorteil dieses Verfahrens besteht darin, dass der Kunde lediglich Ersatzobermesser und nicht vollständige Ersatzschneidelemente anschaffen muss. Nachteilig ist eine längere Stillstandszeit von beispielsweise 10 bis 30 Minuten, da nach dem Austausch der Messer der Schnittspalt neu eingestellt werden muss. Zudem müssen bei diesem Verfahren Ungenauigkeiten beim Schleifvorgang mit erhöhten Schnittspalteinstellungen korrigiert werden. Solche Ungenauigkeiten betreffen insbesondere den Planlauf und die Parallelität.In the other method, only the upper blade is removed from the rotary cutting machine and replaced by a ground upper blade. After replacement, the kerf must be reset. Subsequently, the production can be resumed. The upper blade to be ground is reground separately on a grinding aggregate or at an external company. The advantage of this method is that the customer only needs to purchase spare toppers and incomplete replacement cutting elements. A disadvantage is a longer downtime of, for example, 10 to 30 minutes, since after the replacement of the knife, the kerf must be readjusted. In addition, with this method inaccuracies in the grinding process must be corrected with increased kerf settings. Such inaccuracies relate in particular to the runout and the parallelism.

Die vorveröffentlichte WO 00/69596 offenbart eine Vorrichtung zum Schärfen von kreisrunden Blättern, die am Umfang eine Schneidkante aufweisen, welche an der Stirnkante eines ringförmigen Schleifkörpers geschliffen werden.The pre-published WO 00/69596 discloses a device for sharpening circular leaves having a cutting edge on the circumference, which are ground at the end edge of an annular grinding wheel.

Die DE 101 35 177 A1 beschreibt zwei gegenläufig rotierende Kreismesser, deren Schneidkreise sich im Schneidbereich überlappen und für den Längsbeschnitt von Papier, Pappe, Kunststoff, Gewebe und Metall geeignet sind.DE 101 35 177 A1 describes two counter-rotating circular knives whose cutting circles overlap in the cutting area and are suitable for the longitudinal trimming of paper, cardboard, plastic, fabric and metal.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der genannten Art zu schaffen, das ein einfacheres Nachschleifen, insbesondere des Obermessers, bei geringeren Kosten und trotzdem hoher Schnittqualität ermöglicht.The invention has for its object to provide a method of the type mentioned, which allows easier regrinding, especially the upper blade, at a lower cost and still high quality cut.

Die Aufgabe ist mit dem Verfahren gemäss Anspruch 1 gelöst. Beim erfindungsgemässen Verfahren wird ein Messer, insbesondere das Untermesser, durch eine Schleifscheibe ausgetauscht und mit dieser das nicht ausgetauschte Messer geschliffen. Das Verfahren macht sich die bereits vorhandene hohe Präzision der Lager der Rotationsschneidemaschine für das Nachschleifen zunutze. Das Messer kann somit mit sehr hoher Präzision geschliffen werden. Dadurch ist eine engere Schneidspalteinstellung und damit eine bessere Schneidqualität auch mit einem nachgeschliffenen Messer möglich.The object is achieved by the method according to claim 1. In the method according to the invention, a knife, in particular the lower knife, is exchanged by a grinding wheel and the non-exchanged knife is ground therewith. The process takes advantage of the existing high precision bearings of the rotary cutting machine for regrinding. The knife can thus be ground with very high precision. This allows a narrower gap setting and thus a better cutting quality even with a reground knife.

Messungen haben ergeben, dass beim Verfahren, bei welchem das Obermesser auf einem externen Schleifaggregat nachgeschliffen wird, sich nach dem Einbau in die Rotationsschneidemaschine eine Planlaufdifferenz von 0,01 mm ergibt.
Beim Nachschleifen des Obermessers gemäss dem erfindungsgemässen Verfahren konnte nach dem Nachschleifen kein Planlauffehler gemessen werden. Dies ermöglicht es, den Schnittspalt mit einem erfindungsgemäss geschliffenen Messer um 0,01 mm enger einzustellen, was einer Verringerung von 30% entspricht. Die Wirkung war nicht vorhersehbar und ist somit überraschend.Measurements have shown that in the process in which the upper blade is reground on an external grinding unit, after installation in the rotary cutting machine results in a runout of 0.01 mm.
When regrinding the upper blade according to the method according to the invention, no runout error could be measured after regrinding. This makes it possible to set the kerf narrower by 0.01 mm with a knife ground in accordance with the invention, which corresponds to a reduction of 30%. The effect was unpredictable and is therefore surprising.

Das erfindungsgemässe Verfahren eignet sich insbesondere zum Nachschleifen des Obermessers, grundsätzlich kann aber auch das Untermesser bzw. Gegenmesser nachgeschliffen werden, indem das Obermesser durch eine Schleifscheibe ersetzt wird.The inventive method is particularly suitable for regrinding the upper blade, but in principle, the lower blade or counter blade can be reground by the upper blade is replaced by a grinding wheel.

Das Verfahren eignet sich insbesondere zum Nachschleifen eines Obermessers, das als Segmentmesser ausgebildet ist und das somit auf einem Träger eine Mehrzahl von Klingen besitzt. Solche Segmentobermesser werden grundsätzlich trocken nachgeschliffen. Da die Klingen aufgrund der Segmentierung unterbrochen sind und die nachzuschleifende Fläche relativ klein ist, findet keine kritische Erwärmung statt und es ist somit nicht nötig, während des Schleifvorganges zu kühlen. Grundsätzlich ist auch beim erfindungsgemässen Verfahren ein nasses Nachschleifen möglich. Ein trockenes Nachschleifen ist aber selbstverständlich wesentlich einfacher, da kein Kühlmittel zugeführt werden muss.The method is particularly suitable for regrinding an upper knife, which is designed as a segment knife and thus has a plurality of blades on a support. Such segmental upper blades are always ground dry. Since the blades are interrupted due to the segmentation and the surface to be regrind is relatively small, no critical heating takes place and it is therefore not necessary to cool during the grinding process. In principle, wet regrinding is also possible with the method according to the invention. Dry regrinding is of course much easier, since no coolant must be supplied.

Nach einer Weiterbildung des Verfahrens wird die Schleifscheibe über ein endloses Antriebsorgan mit dem zu schleifenden Messer verbunden. Hierzu ist vorgesehen, die Schleifscheibe als auch das zu schleifende Messer mit einem Rad und insbesondere einem Riemenrad zu versehen. Die Riemenräder sind so ausgebildet, dass sich eine geeignete Übersetzung sowie die optimale Schleifgeschwindigkeit ergibt. Für Hartmetall kann damit die optimale Schleifgeschwindigkeit von 20 bis 25 m/sek. erzielt werden. Als Antriebsorgan eignet sich insbesondere ein flexibler Flachriemen. Aus Sicherheitsgründen oder als Staubschutz lässt sich ohne weiteres eine Schutzabdeckung anbauen. Mit Funkenflug ist aufgrund des geringen Zustellmasses nicht zu rechnen.According to a development of the method, the grinding wheel is connected via an endless drive member with the knife to be ground. For this purpose, it is provided to provide the grinding wheel and the knife to be ground with a wheel and in particular a pulley. The pulleys are designed to provide a suitable gear ratio and optimum grinding speed. For tungsten carbide, the optimum grinding speed of 20 to 25 m / sec. be achieved. As a drive member is particularly suitable a flexible flat belt. For safety reasons or as dust protection can be easily grown a protective cover. With sparks flight is due to the low delivery rate is not expected.

Die Erfindung betrifft zudem eine Rotationsschneidemaschine für die Durchführung des Verfahrens.The invention also relates to a rotary cutting machine for carrying out the method.

Weitere vorteilhafte Merkmale ergeben sich aus den abhängigen Patentansprüchen, der nachfolgenden Beschreibung sowie der Zeichnung.Further advantageous features emerge from the dependent claims, the following description and the drawings.

Das erfindungsgemässe Verfahren wird nachfolgend anhand der Zeichnungen näher erläutert. Es zeigen:

Fig. 1
schematisch eine räumliche Ansicht einer erfindungsgemässen Rotationsschneidemaschine, wobei das Untermesser gegen eine Schleifscheibe ausgetauscht ist,
Fig. 2
eine weitere Ansicht der Rotationsschneidemaschine gemäss Figur 1,
Fig. 3
eine räumliche Ansicht einer erfindungsgemässen Rotationsschneidemaschine, wobei das Obermesser durch eine Schleifscheibe ausgetauscht ist und
Fig. 4
eine weitere Ansicht der Rotationsschneidemaschine gemäss Figur 3.
The inventive method will be explained in more detail with reference to the drawings. Show it:
Fig. 1
schematically a spatial view of an inventive rotary cutting machine, the lower blade replaced by a grinding wheel is
Fig. 2
another view of the rotary cutting machine according to Figure 1,
Fig. 3
a spatial view of an inventive rotary cutting machine, wherein the upper blade is replaced by a grinding wheel and
Fig. 4
a further view of the rotary cutting machine according to Figure 3.

Die in den Figuren 1 und 2 gezeigte Rotationsschneidemaschine 1 weist ein Maschinengestell 2 auf, in dem ein Schneidelement 5 gelagert ist, das ein Obermesser 6 aufweist. Das Schneidelement 5 besitzt eine hier nicht gezeigte Welle, die von einem Motor 3 angetrieben ist, der auf dem Maschinengestell 2 befestigt ist. Unter einer Abdeckung 4 ist ein hier nicht gezeigtes Antriebsorgan angeordnet, das den Motor mit der Welle des Schneidelementes 5 verbindet. Am unteren Ende des Maschinengestelles 2 ist eine Befestigungsplatte 13 angeordnet, mit der die Rotationsschneidemaschine 1 in geeigneter Position neben einem Schuppenstrom bzw. einer Transportvorrichtung für einen solchen Schuppenstrom angeordnet werden kann.The rotary cutting machine 1 shown in Figures 1 and 2 has a machine frame 2, in which a cutting element 5 is mounted, which has an upper blade 6. The cutting element 5 has a shaft, not shown here, which is driven by a motor 3 which is mounted on the machine frame 2. Under a cover 4, a drive member, not shown here, is arranged, which connects the motor with the shaft of the cutting element 5. At the lower end of the machine frame 2, a mounting plate 13 is arranged, with which the rotary cutting machine 1 can be arranged in a suitable position next to a scale flow or a transport device for such a scale flow.

Das Obermesser 6 ist ein sogenanntes Segmentmesser und weist einen scheibenförmigen Träger 7 auf, an dessen Umfang eine Mehrzahl von Klingen 8 aus Hartmetall festgeklemmt sind. Solche Obermesser 6 sind dem Fachmann bekannt.The upper blade 6 is a so-called segment blade and has a disc-shaped carrier 7, on the periphery of a plurality of blades 8 are clamped hard metal. Such outer diameter 6 are known in the art.

Das Schneidelement 5 weist ein in Figur 2 lediglich angedeutetes Lager 16 auf, das als Präzisions-Schrägkugellager ausgebildet ist. In der Figur 2 ist die Achse A1 dieses Lagers 16 angegeben.The cutting element 5 has a in Figure 2 only indicated Bearing 16, which is designed as a precision angular contact ball bearings. In the figure 2, the axis A1 of this bearing 16 is indicated.

Auf das Obermesser 6 ist ein Riemenrad 9 aufgebaut, das koaxial zur Achse A1 angeordnet ist. Über dieses Riemenrad 9 ist ein Antriebsriemen 10 gelegt, der um ein weiteres Riemenrad 11 einer Schleifscheibe 12 gelegt ist. Diese Schleifscheibe 12 ist auf eine Aufnahme 28 aufgesetzt, auf welcher überlicherweise gemäss Figur 3 das Untermesser 20 eines weiteren Schneidelementes 29 sitzt. Diese Aufnahme 28 ist mit einer hier nicht gezeigten Welle verbunden, die in einem in Figur 4 lediglich angedeuteten Lager 17 gelagert ist. Die Achse A2 dieser Welle ist parallel zur Achse A1. Die Aufnahme 28 ist an einem mit einem Nonius versehenen Drehknopf 18 einer Zustellvorrichtung 19 in den Richtungen der Achse A2 verstellbar. Die Verstellung erfolgt in an sich bekannter Weise, insbesondere über eine Stellspindel. Hierbei wird beispielsweise eine Büchse oder ein Schlitten auf einer Schwalbenschwanzführung verschoben. Es ist somit entlang der Achse A2 eine sehr präzise Zustellung der Schleifscheibe 12 möglich.On the upper blade 6, a pulley 9 is constructed, which is arranged coaxially to the axis A1. About this pulley 9, a drive belt 10 is placed, which is placed around another pulley 11 of a grinding wheel 12. This grinding wheel 12 is placed on a receptacle 28, on which, according to FIG. 3, the lower blade 20 of a further cutting element 29 is usually seated. This receptacle 28 is connected to a shaft, not shown here, which is mounted in a bearing 17 only indicated in Figure 4. The axis A2 of this shaft is parallel to the axis A1. The receptacle 28 is adjustable on a provided with a vernier knob 18 of a feed device 19 in the directions of the axis A2. The adjustment takes place in a conventional manner, in particular via an adjusting spindle. Here, for example, a sleeve or a carriage is moved on a dovetail guide. It is thus possible along the axis A2 a very precise delivery of the grinding wheel 12.

Die Schleifscheibe 12 weist gemäss Figur 2 eine plane Innenseite 15 auf, welche in einem oberen Bereich an einen unteren Bereich einer Innenseite 14 des Obermessers 6 anlegbar ist. Wird das Obermesser 6 mit dem Motor 3 um die Achse A1 gedreht, so dreht die Schleifscheibe 12 gleichzeitig um die Achse A2, da der Antriebsriemen 10 das Obermesser 6 mit der Schleifscheibe 12 verbindet. Da nun das Riemenrad 11 einen wesentlich kleineren Durchmesser aufweist als das Riemenrad 9, dreht die Schleifscheibe 12 wesentlich schneller als das Obermesser 6.The grinding wheel 12 has, according to FIG. 2, a flat inner side 15 which can be placed in an upper area against a lower area of an inner side 14 of the upper blade 6. If the upper blade 6 is rotated about the axis A1 with the motor 3, the grinding wheel 12 simultaneously rotates about the axis A2, since the drive belt 10 connects the upper blade 6 with the grinding wheel 12. Since now the pulley 11 has a substantially smaller diameter than the pulley 9, the grinding wheel 12 rotates much faster than the upper blade. 6

Das Übersetzungsverhältnis ist so gewählt, dass sich eine optimale Schleifgeschwindigkeit ergibt, die bei Klingen 8 aus Hartmetall im Bereich von 20 bis 25 m/sek. liegt.The gear ratio is chosen to give an optimum grinding speed that is in the case of blades 8 made of hard metal in the range of 20 to 25 m / sec. lies.

Nachfolgend wird das Verfahren zum Nachschleifen des Obermessers 6 näher erläutert.The method for regrinding the upper blade 6 will be explained in more detail.

Zum Nachschleifen des Obermessers 6 wird das Untermesser 20 ausgebaut und somit von der Aufnahme 28 abgenommen. Nun wird die Schleifscheibe 12 auf die Aufnahme 28 aufgesetzt und drehfest mit dieser verbunden. Das Riemenrad 11 sitzt hierbei bereits auf der Schleifscheibe 12. Nun wird am Obermesser 6 das Riemenrad 9 angebaut. Über die beiden Riemenräder 9 und 11 wird der Antriebsriemen 10 gelegt. Aus Sicherheitsgründen wird eine hier nicht gezeigte Schutzabdeckung angebracht, welche insbesondere das Obermesser 6 abdeckt. Nun wird der Motor 3 angeschaltet, sodass nun das Obermesser 6 und die Schleifscheibe 12 angetrieben sind. Aufgrund der oben genannten Übersetzung entspricht die relative Drehgeschwindigkeit der optimalen Schleifgeschwindigkeit.For regrinding the upper blade 6, the lower blade 20 is removed and thus removed from the receptacle 28. Now, the grinding wheel 12 is placed on the receptacle 28 and rotatably connected thereto. The pulley 11 is already sitting on the grinding wheel 12. Now, the pulley 9 is attached to the upper blade 6. About the two pulleys 9 and 11 of the drive belt 10 is placed. For safety reasons, a protective cover, not shown here, is attached, which covers in particular the upper blade 6. Now the motor 3 is switched on, so that now the upper blade 6 and the grinding wheel 12 are driven. Due to the above-mentioned translation, the relative rotational speed corresponds to the optimum grinding speed.

Am Drehknopf 18 wird nun die Schleifscheibe 12 zugestellt, bis die Innenseite 15 der Schleifscheibe 12 an Flächen der Klingen 8 anliegt. Die Nachschleifzeit hängt davon ab, wie stark die Klingen 8 abgenützt sind. Pro Schleifvorgang wird die Schleifscheibe 12 beispielsweise um etwa 1/100 mm nachgestellt und anschliessend wird während etwa einer Minute geschliffen. Dieser Vorgang wird so lange wiederholt, bis die Klingen 8 die erforderliche Qualität aufweisen. Nach der letzten Zustellung muss beispielsweise 10 Minuten ausgeschliffen werden.On the knob 18, the grinding wheel 12 is now delivered until the inner side 15 of the grinding wheel 12 bears against surfaces of the blades 8. The regrinding time depends on how severely the blades 8 are worn. For each grinding operation, the grinding wheel 12 is readjusted, for example, by about 1/100 mm and then ground for about one minute. This process is repeated until the blades 8 have the required quality. After the last delivery, for example, 10 minutes must be ground.

Ist das Obermesser 6 fertig geschliffen, so wird die Schleifscheibe 12 gegen das Untermesser 20 ausgetauscht. Der Antriebsriemen 10 und die beiden Riemenräder 9 und 11 werden hierbei entfernt. Nach dem Einstellen des Schnittspaltes ist die Rotationsschneidemaschine 1 für die weitere Produktion wieder bereit.If the upper blade 6 is finished, the grinding wheel 12 is exchanged for the lower blade 20. The drive belt 10 and the two pulleys 9 and 11 are removed here. After adjusting the kerf, the rotary cutting machine 1 is ready for further production.

Das genannte Nachschleifen kann trocken erfolgen, da die Klingen aufgrund der Segmentierung unterbrochen sind und keine kritische Erwärmung stattfindet. Ist das Obermesser 6 kein solches Segmentmesser, so ist grundsätzlich auch ein nasses Nachschleifen mit geeigneter Kühlflüssigkeit möglich. Wie bereits oben erläutert, erfolgt das Nachschleifen mit hoher Präzision, da die hohe Präzision der Lagerungen der Schneidelemente mit der spielfreien Verstellung auch für das Nachschleifen genutzt wird. Der Schnittspalt kann damit auch nach dem Nachschleifen optimal klein eingestellt werden, wodurch ausgezeichnete Schneidresultate möglich sind.The aforementioned regrinding can be done dry because the blades are interrupted due to the segmentation and no critical heating takes place. If the upper blade 6 is not such a segment blade, a wet regrinding with suitable coolant is basically possible. As already explained above, the regrinding is carried out with high precision, since the high precision of the bearings of the cutting elements with the backlash-free adjustment is also used for regrinding. The cutting gap can thus be set optimally small even after regrinding, resulting in excellent cutting results.

Das Verfahren ist auch zum Schleifen des Untermessers 20 anwendbar. Hierbei wird das Obermesser 6 gegen die in den Figuren 3 und 4 gezeigte Schleifscheibe 21 ausgetauscht. Beim Nachschleifen wird entsprechend die Schleifscheibe 21 direkt vom Motor 3 angetrieben. Auf das Untermesser 20 wird ein Riemenrad 23 aufgesetzt, das über den Antriebsriemen 10 mit dem Riemenrad 22 verbunden wird. Auch in diesem Fall ist die Übersetzung so gewählt, dass sich eine optimale Schnittgeschwindigkeit ergibt. Das nachzuschleifende Untermesser 20 besteht aus einem Träger 26, auf den ein Ring 27 aus Hartmetall aufgeklebt ist. Dieser Ring 27 weist gemäss Figur 4 eine Innenseite 25 auf, an der beim Nachschleifen eine plane Innenseite 24 der Schleifscheibe 21 angelegt wird. Zum Nachschleifen wird das Untermesser 20 durch Drehen des Drehknopfes 18 zugestellt. Aus den oben genannten Gründen ist auch hier ein sehr präziser Schleifvorgang möglich, der ausgezeichnete Schneidresultate ermöglicht. Ist das Untermesser 20 fertig nachgeschliffen, so wird die Schleifscheibe 21 ausgebaut und durch das Obermesser 6 ersetzt. Selbstverständlich werden der Riemen 10 und die beiden Riemenräder 22 und 23 entfernt. Sowohl beim Nachschleifen des Obermessers 6 als auch beim Nachschleifen der Untermesser 20 erfolgt der Antrieb durch den Motor 3. Grundsätzlich ist es auch möglich, für den Antrieb der Schleifscheibe 12 oder des Untermessers 20 einen weiteren Motor zu verwenden.The method is also applicable for grinding the lower blade 20. In this case, the upper blade 6 is replaced by the grinding wheel 21 shown in FIGS. 3 and 4. During regrinding, the grinding wheel 21 is driven directly by the motor 3 accordingly. On the lower blade 20, a pulley 23 is placed, which is connected via the drive belt 10 with the pulley 22. Also in this case, the translation is chosen so that there is an optimal cutting speed. The nachzuschleifende lower blade 20 consists of a carrier 26, on which a ring 27 is cemented from hard metal. According to FIG. 4, this ring 27 has an inner side 25 on which, during regrinding, a plane inner side 24 of FIG Grinding wheel 21 is applied. For regrinding the lower blade 20 is delivered by turning the knob 18. For the reasons mentioned above, a very precise grinding process is also possible here, which enables excellent cutting results. If the lower blade 20 has been reground, the grinding wheel 21 is removed and replaced by the upper blade 6. Of course, the belt 10 and the two pulleys 22 and 23 are removed. Both the regrinding of the upper blade 6 and the regrinding of the lower blade 20, the drive by the motor 3. In principle, it is also possible to use for driving the grinding wheel 12 or the lower blade 20, a further motor.

Claims (10)

  1. Method of sharpening a knife (6, 20) of a rotary cutting machine (1) for the printed products processing industry, wherein a first knife (6) forms with a first bearing (16) a first cutting element (5) and cooperates for the cutting operation with a second knife (20) which forms with a second bearing (17) a second cutting element (29), characterized in that to sharpen one knife (6, 20), the other knife (20, 6) is removed and replaced with a grinding disc (12, 21) and the grinding disc (12, 21) or the knife to be sharpened (20) is advanced for the sharpening operation.
  2. Method according to Claim 1, characterized in that the grinding disc (12, 21) and the knife to be sharpened (6, 20) are driven separately, or have a drive means (9, 11; 22, 23) and are harnessed to each other by a drive element (10).
  3. Method according to Claim 1 or Claim 2, characterized in that the second bearing (17) has means for cutting-gap adjustment and in that this means is used for advancing the grinding disc (12) or the knife to be sharpened (20).
  4. Method according to any one of Claims 1 to 3, characterized in that the first knife (6) is a segmental knife that has a plurality of blades (8) disposed around the periphery of a carrier (7).
  5. Method according to any one of Claims 1 to 4, characterized in that the first knife (6) is an upper knife and the second knife (20) is a bottom knife or a counter knife.
  6. Method according to Claim 5, characterized in that the upper knife is a segmental knife which is resharpened by dry grinding.
  7. Method according to Claim 5 or Claim 6, characterized in that to resharpen the upper knife (6), the bottom knife (20) is exchanged for a grinding disc (12) and in that the grinding disc (12) or the knife to be sharpened (20) is advanced for the sharpening operation.
  8. Method according to Claim 7, characterized in that the advance is performed by means of a vernier.
  9. Rotary cutting machine for the printed products processing industry, wherein a first knife (6) forms with a first bearing (16) a first cutting element (5) and cooperates for the cutting operation with a second knife (20) which forms with a second bearing (17) a second cutting element (29), characterized in that to carry out the method according to Claim 1, at least one grinding disc (12, 21) is provided which is mounted in lieu of the first or second knife (6, 20) on the holder (28) for the corresponding knife (6, 20) and which has a grinding face (15, 24) to which the side to be ground (14, 25) of the knife to be resharpened (6, 20) can be applied or advanced.
  10. Rotary cutting machine according to Claim 9, characterized in that a drive element (11, 23), in particular a belt pulley, is attached to the grinding disc (12, 21), and in that a second drive element (9, 23) is provided which is attached to the knife to be sharpened (6, 20), and in that a drive element (10), in particular a drive belt, is provided which harnesses the grinding disc (12, 21) to the knife to be resharpened (6, 20).
EP20030405621 2003-08-28 2003-08-28 Method of sharpening the blades of a rotary cutting machine and rotary cutter for carrying out the method Expired - Lifetime EP1510288B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE50306512T DE50306512D1 (en) 2003-08-28 2003-08-28 Method for grinding the knives of a rotary cutting machine and rotary cutter for carrying out the method
EP20030405621 EP1510288B1 (en) 2003-08-28 2003-08-28 Method of sharpening the blades of a rotary cutting machine and rotary cutter for carrying out the method
JP2004247617A JP4570923B2 (en) 2003-08-28 2004-08-26 Method for polishing blades of a rotary cutting device and rotary cutting device for carrying out this method
US10/927,187 US7083503B2 (en) 2003-08-28 2004-08-27 Method for sharpening the knife of a rotary trimmer and a rotary trimmer for realizing the method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20030405621 EP1510288B1 (en) 2003-08-28 2003-08-28 Method of sharpening the blades of a rotary cutting machine and rotary cutter for carrying out the method

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EP1510288A1 EP1510288A1 (en) 2005-03-02
EP1510288B1 true EP1510288B1 (en) 2007-02-14

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EP (1) EP1510288B1 (en)
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1637295B1 (en) 2004-09-20 2008-11-05 Müller Martini Holding AG Rotary cutter with device for axial gap adjustment of the cutters
EP1952956A1 (en) 2007-02-02 2008-08-06 Müller Martini Holding AG Device for cutting printed products fed in an overlapping formation
US8220383B2 (en) * 2008-04-15 2012-07-17 Premark Feg L.L.C. Food product slicer with timed sharpening operation

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Publication number Priority date Publication date Assignee Title
JPS516385B1 (en) * 1968-12-05 1976-02-27
JPS508184A (en) * 1973-05-28 1975-01-28
JPH03160462A (en) * 1989-11-17 1991-07-10 Mita Ind Co Ltd Magenta light sensitive toner
CH681363A5 (en) * 1990-04-02 1993-03-15 Grapha Holding Ag
JP2888617B2 (en) * 1990-08-07 1999-05-10 ユジナージュ モンタージュ エ アシスタンス テクニーク ユー エム ア テ Rotary cutting device
US5709255A (en) * 1996-10-18 1998-01-20 Key Knife, Inc. Chipper with detachable facing knives
US6748836B2 (en) * 1998-01-15 2004-06-15 Gerber Technology, Inc. Dual sharpener apparatus for maintaining the sharpness of the cutting edge on blades used to cut sheet-type work materials
US5941148A (en) * 1998-01-16 1999-08-24 Tidland Corporation Automatic slitter blade sharpener
IT1310565B1 (en) * 1999-05-12 2002-02-18 Julia Utensili Srl SHARPENING DEVICE FOR DISC BLADES
DE10135177A1 (en) * 2001-07-19 2003-02-06 Werner Schaefer Knife arrangement used for cutting paper, cardboard, plastic woven material and metal comprises circular knives rotating against each other and a counter knife
US6692424B2 (en) * 2001-08-01 2004-02-17 Gammerler Corporation Rotary trimmer apparatus and method
US6616515B2 (en) * 2001-09-17 2003-09-09 David L. Dwyer Universal jointing attachment for inserted tooth carbide heads
US6752052B2 (en) * 2001-10-30 2004-06-22 Delaware Capital Formation, Inc. Cutter assembly
US6634257B2 (en) * 2002-01-15 2003-10-21 John W. Long Sharpening method and apparatus for rotary knives

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JP2005074624A (en) 2005-03-24
US20050048878A1 (en) 2005-03-03
JP4570923B2 (en) 2010-10-27
DE50306512D1 (en) 2007-03-29
US7083503B2 (en) 2006-08-01
EP1510288A1 (en) 2005-03-02

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