EP0517192A1 - Method for sharpening the blade of a machine for cutting fabric - Google Patents

Method for sharpening the blade of a machine for cutting fabric Download PDF

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Publication number
EP0517192A1
EP0517192A1 EP92109395A EP92109395A EP0517192A1 EP 0517192 A1 EP0517192 A1 EP 0517192A1 EP 92109395 A EP92109395 A EP 92109395A EP 92109395 A EP92109395 A EP 92109395A EP 0517192 A1 EP0517192 A1 EP 0517192A1
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EP
European Patent Office
Prior art keywords
knife
grinding device
grinding
cutting
blade
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.)
Withdrawn
Application number
EP92109395A
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German (de)
French (fr)
Inventor
Rolf Dipl.-Ing. Jung
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.)
Bullmer Spezialmaschinen GmbH
Original Assignee
Bullmer Spezialmaschinen GmbH
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Filing date
Publication date
Application filed by Bullmer Spezialmaschinen GmbH filed Critical Bullmer Spezialmaschinen GmbH
Publication of EP0517192A1 publication Critical patent/EP0517192A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B24B3/361—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades of reciprocating blades
    • 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
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/3806—Cutting-out; Stamping-out wherein relative movements of tool head and work during cutting have a component tangential to the work surface
    • B26F1/3813—Cutting-out; Stamping-out wherein relative movements of tool head and work during cutting have a component tangential to the work surface wherein the tool head is moved in a plane parallel to the work in a coordinate system fixed with respect to the work
    • B26F1/382—Cutting-out; Stamping-out wherein relative movements of tool head and work during cutting have a component tangential to the work surface wherein the tool head is moved in a plane parallel to the work in a coordinate system fixed with respect to the work wherein the cutting member reciprocates in, or substantially in, a direction parallel to the cutting edge

Definitions

  • the invention relates to a method for grinding the knife surfaces of the knife of an fabric cutting machine that executes an oscillating lifting movement by means of a grinding device with the features of the preamble of claim 1.
  • the knives of fabric cutting machines such as butt knife machines or cutting heads are used to cut several layers of fabric in a layer package, the tip of the knife penetrating a support, usually a bristle band.
  • the knife is subject to wear: it becomes dull, which is why it has to be sharpened to ensure a clean cut.
  • the knife is completely lifted out of the layer package and the bristle band, if necessary. also above a hold-down device, as is usually provided.
  • the grinding elements of a grinding device are then brought into abutment against the knife surfaces and a grinding process is initiated which consists in an oscillating lifting movement similar to that when cutting the layers of material.
  • both knife surfaces must be ground, for which it is common to arrange grinding elements for the two knife surfaces offset one above the other or to cycle one knife surface with one stroke movement and the other knife surface with the other stroke movement.
  • the stroke movement of the knife during the cutting process is such that the knife tip is always within the bristle band.
  • the length of the knife depends largely on the thickness of the layer package to be cut. In the known procedure, it is therefore not sufficient to provide a single grinding device, since this can only grind a section of the knife that corresponds to the stroke of the oscillating stroke movement. It is therefore necessary to arrange at least two grinding devices one above the other, the The outer distance between the two grinding devices determines the maximum grinding length and the dimensions of the grinding devices must be such that the inner distance is less than the stroke. The consequence of this is that a considerable overall height may be required and a fabric cutting machine must be dimensioned according to the maximum grinding length. Retrofitting is not possible.
  • the grinding stroke could differ significantly from the cutting stroke and be such that the knife is guided past a grinding device over its entire length to be ground in the grinding stroke.
  • this is hardly feasible due to the design, but at least it is too expensive for a practical machine, especially since it is not possible to adapt to different grinding heights.
  • the basic idea of the invention is to subject knives to a grinding process each time they are pulled out, and this if necessary. to be repeated regularly and thereby to dispense with the oscillating lifting movement previously considered inevitable when grinding. Furthermore, it can be achieved that grinding operations are only carried out when this is absolutely necessary, whereby the service life of the knife is significantly increased. Finally, when changing the grinding length, it is only necessary to provide a longer knife, this one Grinding length allows and to ensure that this longer knife can actually be pulled out above the hold-down.
  • Fig. 1 shows a schematic side view of the essential elements of a fabric cutting machine 1 of known design, when used for cutting (left part) and when used for grinding (right part).
  • a package 3 consisting of several layers of fabric 4 rests on a base formed as a bristle band 2, the layers 4 of the package 3 being cut according to a predetermined cutting pattern.
  • a negative pressure is generated via the bristle band 2, and an air-impermeable film lies on the uppermost layer 4 of the package 3.
  • a stiff package 3 is produced, which can be easily cut by means of the fabric cutting machine 1.
  • the fabric cutting machine 1 has a knife 6 held in a holder 5, which by means of a drive device, not shown, which also the holder 5 and thus the Knife 6 holds, can be moved up and down.
  • the upper position of the bracket 5 is shown by chain lines.
  • the upper position of the tip 7 of the knife 6 is also shown by chain lines.
  • the fabric cutting machine 1 also has a hold-down device 9 which has an opening 10 through which the knife 6 passes. On the hold-down device 9, conventional guides 11 are provided in the region of this opening 10.
  • the knife 6 In the operating state in the left half of FIG. 1, in which the layers 4 are cut, the knife 6 is lowered in such a way that its tip 7 is inside the bristle band 2 even at top dead center OT.
  • a support device 12 for a schematically illustrated grinding device 13 is provided between the hold-down device 9 and the holder 5 of the knife 6.
  • the grinding device 13 has drive connections (not shown in more detail) for an actuating device and an actuating device.
  • a required knife length which is the sum of the layer thickness 14, the distance 15 between the underside of the hold-down device and the underside of the holder 5 in the position of the knife tip 7 corresponding to bottom dead center UT, and the distance 16 between the top of the bristle band 2 and corresponds to the position of the bottom dead center UT of the knife tip 7. It turns out that, with the rest of the same construction, only the layer thickness 14 is variable in size.
  • a feed takes place in the direction of arrow V of the fabric cutting machine 1 in the position shown in the left half, an oscillating stroke movement taking place over the stroke 8 of the lowered knife 6 pierced through all layers 4 of the package 3 and into the bristle band 2 .
  • the knife When cutting, the knife is subject to wear over a section which corresponds to the sum of the layer thickness 14 and the distance 16. This section, which will be called the grinding length below, must be ground so that a safe and clean cut is possible.
  • the stroke movement of the knife 6 is stopped at the bottom dead center UT in the inserted state, the grinding device 13 is moved to bear against the knife surfaces of the knife 6 and the grinding process is started up.
  • the knife 6 is pulled out, as shown in the right half in FIG. 1, and moved with grinding by the grinding device 13, namely until the knife tip 7 is also ground, since this is necessary.
  • the knife 6 is then lowered again into the position shown in the left half in FIG. 1. This is preferably repeated regularly, and in any case whenever the knife has to be lifted out of the cutting position, for example at corners of a predetermined cutting pattern, in which a rotation of the fabric cutting machine 1 outside the package 3 is required.
  • the grinding process is repeated regularly after a predetermined and programmable cutting time.
  • This distance a can be determined by counting the lifting cycles when cutting, by evaluating a period of time during cutting, but also by simply measuring the length. It depends on the consistency of the bristles and especially the layers 4 of the package 3 and the thickness 14 of the package. In practice, values of 2 to 4 m are expedient for distance a.
  • a single effective grinding device 13 has to be provided, the overall height of which can be made as low as possible. It is only necessary to ensure that both knife surfaces can be ground.
  • a grinding device 13 of low overall height is, for example, a roll grinding device or a belt grinding device, as is shown schematically in FIG. 3.
  • FIG. 3 shows in cross section the blade of the knife 6 with the two knife surfaces 21 and 22 to be sharpened, two endless grinding belts 23 and 24 being arranged one above the other by means of a schematically illustrated respective eccentric roller 25 or 26 are pressed against the knife surfaces 21, 22.
  • the sanding belts 25, 26 also run over deflection rollers 27, 28 and 29, 30, respectively.
  • the grinding belt 23 or 24 is out of contact with the knife surfaces 21 and 22 of the knife 6.
  • the two eccentric rollers 25, 26 become Adjusting devices, not shown, are deflected such that the grinding belts 23 and 24 come into abutment against the knife surfaces 21 and 22, respectively.
  • each grinding belt 23 or 24 is set in motion by a drive device, also not shown, ie the grinding device 13 is put into operation. If the knife 6 is then pulled upward from the position shown in FIG. 1 in its left section, the two knife surfaces 21 and 22 are ground.
  • the static conditions in particular the knife stiffness, allow the grinding device to remain in operation even when the knife 6 is lowered again, this is however not absolutely necessary. Rather, the distance a can be determined accordingly so that there is always sufficient sharpness of the knife 6.
  • the knife life can be increased because it is easy to optimize the intervals a at which the regular grinding takes place.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

A method of sharpening the surfaces of the blade (6) of a machine (1) for cutting fabric by means of a grinding device (13) is specified. Starting from the bottom dead centre position (UT) of the tip (7) of the blade (6) during the cutting operation, a grinding device (13) arranged close to the holding-down device (9) is brought to bear against the surfaces of the blade (6) and activated. The blade (6) is then pulled out until the tip (7) is also ground by the grinding device (13). The grinding device (13) is then stopped and the blade (6) is put back into the cutting position. This procedure is regularly repeated and in addition takes place even if it is necessary to pull out the blade (6) for cutting reasons. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zum Schleifen der Messerflächen des eine oszillierende Hubbewegung ausführenden Messers einer Stoffschneidemaschine mittels einer Schleifvorrichtung mit den Merkmalen des Oberbegriffs des Anspruchs 1.The invention relates to a method for grinding the knife surfaces of the knife of an fabric cutting machine that executes an oscillating lifting movement by means of a grinding device with the features of the preamble of claim 1.

Die Messer von Stoffschneidemaschinen wie Stoßmessermaschinen oder Schneidköpfen dienen zum Schneiden mehrerer Stofflagen eines Lagenpaketes, wobei die Spitze des Messers in eine Auflage, üblicherweise ein Borstenband eindringt. Dabei unterliegt das Messer einem Verschleiß: Es wird stumpf, weshalb es, um einen sauberen Schnitt gewährleisten zu können, geschliffen werden muß. Zu diesem Zweck wird das Messer vollständig aus dem Lagenpaket und dem Borstenband herausgehoben, ggfls. auch oberhalb eines Niederhalters, wie er üblicherweise vorgesehen wird. Es werden dann die Schleifelemente einer Schleifvorrichtung in Anlage gegen die Messerflächen gebracht und ein Schleifvorgang ausgelöst, der in einer oszillierenden Hubbewegung ähnlich der beim Schneiden der Stofflagen besteht. Dabei ist zu beachten, daß beide Messerflächen geschliffen werden müssen, wozu es üblich ist, Schleifelemente für die beiden Messerflächen versetzt übereinander anzuordnen oder taktgesteuert bei einer Hubbewegung die eine Messerfläche und bei der anderen Hubbewegung die andere Messerfläche zu schleifen.The knives of fabric cutting machines such as butt knife machines or cutting heads are used to cut several layers of fabric in a layer package, the tip of the knife penetrating a support, usually a bristle band. The knife is subject to wear: it becomes dull, which is why it has to be sharpened to ensure a clean cut. For this purpose, the knife is completely lifted out of the layer package and the bristle band, if necessary. also above a hold-down device, as is usually provided. The grinding elements of a grinding device are then brought into abutment against the knife surfaces and a grinding process is initiated which consists in an oscillating lifting movement similar to that when cutting the layers of material. It should be noted that both knife surfaces must be ground, for which it is common to arrange grinding elements for the two knife surfaces offset one above the other or to cycle one knife surface with one stroke movement and the other knife surface with the other stroke movement.

Die Hubbewegung des Messers beim Schneidvorgang ist derart, daß sich die Messerspitze stets innerhalb des Borstenbandes befindet. Die Länge des Messers hängt dagegen von der Dicke zu schneidenden Lagenpaketes wesentlich ab. Bei der bekannten Vorgehensweise reicht es daher nicht aus, eine einzige Schleifvorrichtung vorzusehen, da diese nur einen Abschnitt des Messers, der dem Hub der oszillierenden Hubbewegung entspricht, schleifen kann. Es sind daher mindestens zwei Schleifvorrichtungen übereinander anzuordnen, wobei der Außenabstand der beiden Schleifvorrichtungen die maximale Schleiflänge bestimmt und die Abmessungen der Schleifvorrichtungen so sein müssen, daß der Innenabstand kleiner als der Hub ist. Dies hat zur Folge, daß eine u.U. erhebliche Bauhöhe erforderlich ist und eine Stoffschneidemaschine nach der maximalen Schleiflänge bemessen werden muß. Eine Umrüstung ist nicht möglich.The stroke movement of the knife during the cutting process is such that the knife tip is always within the bristle band. The length of the knife, however, depends largely on the thickness of the layer package to be cut. In the known procedure, it is therefore not sufficient to provide a single grinding device, since this can only grind a section of the knife that corresponds to the stroke of the oscillating stroke movement. It is therefore necessary to arrange at least two grinding devices one above the other, the The outer distance between the two grinding devices determines the maximum grinding length and the dimensions of the grinding devices must be such that the inner distance is less than the stroke. The consequence of this is that a considerable overall height may be required and a fabric cutting machine must be dimensioned according to the maximum grinding length. Retrofitting is not possible.

Gemäß einem anderen Gedanken könnte der Schleifhub sich deutlich vom Schneidehub unterscheiden und so sein, daß das Messer im Schleifhub über seine gesamte zu schleifende Länge an einer Schleifvorrichtung vorbeigeführt wird. Dies ist jedoch konstruktionsbedingt kaum realisierbar, zumindest jedoch für praktisch verwendbare Maschine zu aufwendig, zumal eine Anpassung an unterschiedliche Schleifhöhen nicht möglich ist.According to another idea, the grinding stroke could differ significantly from the cutting stroke and be such that the knife is guided past a grinding device over its entire length to be ground in the grinding stroke. However, this is hardly feasible due to the design, but at least it is too expensive for a practical machine, especially since it is not possible to adapt to different grinding heights.

Es ist daher Aufgabe der Erfindung ein Verfahren anzugeben, bei dem auch bei unterschiedlichen Schleifhöhen und trotz einfacher Bauweise ein sicheres Schleifen des Messers gewährleistet ist.It is therefore an object of the invention to provide a method in which a safe grinding of the knife is ensured even with different grinding heights and despite a simple construction.

Die Aufgabe wird durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.The object is achieved by the characterizing features of claim 1.

Die Erfindung wird durch die Merkmale der Unteransprüche weitergebildet.The invention is further developed by the features of the subclaims.

Der Grundgedanke der Erfindung besteht darin, daß Messer bei jedem Herausziehen bereits zu Beginn des Herausziehens einem Schleifvorgang zu unterwerfen und dies ggfls. regelmäßig zu wiederholen und dabei auf die bisher als unumgänglich angesehene oszillierende Hubbewegung beim Schleifen zu verzichten. Ferner kann erreicht werden, daß Schleifvorgänge nur durchgeführt werden, wenn dies unbedingt erforderlich ist, wodurch die Lebensdauer des Messers wesentlich erhöht wird. Schließlich ist bei Änderung der Schleiflänge lediglich erforderlich, ein längeres Messer vorzusehen, das diese Schleiflänge erlaubt und sicherzustellen, daß dieses längere Messer auch tatsächlich bis oberhalb des Niederhalters herausgezogen werden kann.The basic idea of the invention is to subject knives to a grinding process each time they are pulled out, and this if necessary. to be repeated regularly and thereby to dispense with the oscillating lifting movement previously considered inevitable when grinding. Furthermore, it can be achieved that grinding operations are only carried out when this is absolutely necessary, whereby the service life of the knife is significantly increased. Finally, when changing the grinding length, it is only necessary to provide a longer knife, this one Grinding length allows and to ensure that this longer knife can actually be pulled out above the hold-down.

Die Erfindung wird anhand eines Ausführungsbeispiels schematisch näher erläutert. Es zeigen:

  • Fig. 1 ein Messer mit zugeordneter Schleifvorrichtung zum einen in Schneidstellung und zum anderen in der angehobenen das Schleifen der Messerspitze ermöglichenden Stellung;
  • Fig. 2 schematisch eine Skizze zur Erläuterung der Orte, an denen ein Schleifen erfolgt;
  • Fig. 3 schematisch in Aufsicht die Ausbildung einer Band-Schleifvorrichtung zum Schleifen beider Messerflächen
The invention is explained schematically in more detail using an exemplary embodiment. Show it:
  • 1 shows a knife with an associated grinding device on the one hand in the cutting position and on the other hand in the raised position enabling the sharpening of the knife tip;
  • 2 schematically shows a sketch to explain the places where grinding takes place;
  • Fig. 3 shows schematically in supervision the formation of a belt grinding device for grinding both knife surfaces

Fig. 1 zeigt in Seitenansicht schematisch die wesentlichen Elemente einer Stoffschneidemaschine 1 an sich bekannter Bauart, bei deren Einsatz beim Schneiden (linker Teil) sowie bei deren Einsatz beim Schleifen (rechter Teil).Fig. 1 shows a schematic side view of the essential elements of a fabric cutting machine 1 of known design, when used for cutting (left part) and when used for grinding (right part).

Auf einer als Borstenband 2 ausgebildeten Unterlage ruht ein Paket 3 aus mehreren Stoff-Lagen 4, wobei die Lagen 4 des Paketes 3 nach einem vorgegebenen Schnittmuster zuzuschneiden sind. In bekannter und nicht näherer dargestellter Weise wird über das Borstenband 2 ein Unterdruck erzeugt, und liegt auf der obersten Lage 4 des Paketes 3 eine luftundurchlässige Folie. Hierdurch wird ein brettsteifes Paket 3 erzeugt, das leicht mittels der Stoffschneidemaschine 1 geschnitten werden kann.A package 3 consisting of several layers of fabric 4 rests on a base formed as a bristle band 2, the layers 4 of the package 3 being cut according to a predetermined cutting pattern. In a known and not shown manner, a negative pressure is generated via the bristle band 2, and an air-impermeable film lies on the uppermost layer 4 of the package 3. As a result, a stiff package 3 is produced, which can be easily cut by means of the fabric cutting machine 1.

Die Stoffschneidemaschine 1 weist ein in einer Halterung 5 gehaltertes Messer 6 auf, das mittels einer nicht dargestellten Antriebseinrichtung, die auch die Halterung 5 und damit das Messer 6 hält, auf- und abbewegbar ist. Die obere Stellung der Halterung 5 ist dabei durch Strichpunktlinien dargestellt. Die obere Stellung der Spitze 7 des Messers 6 ist ebenfalls durch Strichpunktlinien dargestellt. In bekannter Weise spricht man bei den beiden Umkehrpunkten von einem unteren und einem obereren Totpunkt UT bzw. OT. Das Messer 6 führt also einen Hub 8 aus. Die Stoffschneidemaschine 1 weist ferner einen Niederhalter 9 auf, der eine öffnung 10 aufweist, durch die das Messer 6 tritt. Am Niederhalter 9 sind im Bereich dieser Öffnung 10 an sich übliche Führungen 11 vorgesehen.The fabric cutting machine 1 has a knife 6 held in a holder 5, which by means of a drive device, not shown, which also the holder 5 and thus the Knife 6 holds, can be moved up and down. The upper position of the bracket 5 is shown by chain lines. The upper position of the tip 7 of the knife 6 is also shown by chain lines. In a known manner, one speaks at the two reversal points of a lower and an upper dead center UT or OT. The knife 6 thus executes a stroke 8. The fabric cutting machine 1 also has a hold-down device 9 which has an opening 10 through which the knife 6 passes. On the hold-down device 9, conventional guides 11 are provided in the region of this opening 10.

Bei dem Betriebszustand in der linken Hälfte der Fig. 1, in dem die Lagen 4 geschnitten werden, ist das Messer 6 derart abgesenkt, daß dessen Spitze 7 selbst im oberen Totpunkt OT innerhalb des Borstenbandes 2 ist. In der dem unteren Totpunkt UT der Messerspitze 7 entsprechenden Lage ist zwischen dem Niederhalter 9 und der Halterung 5 des Messers 6 eine Stützeinrichtung 12 für eine schematisch dargestellte Schleifvorrichtung 13 vorgesehen. Die Schleifvorrichtung 13 weist nicht näher dargestellte Antriebsverbindungen für eine Stelleinrichtung und eine Betätigungseinrichtung auf.In the operating state in the left half of FIG. 1, in which the layers 4 are cut, the knife 6 is lowered in such a way that its tip 7 is inside the bristle band 2 even at top dead center OT. In the position corresponding to the bottom dead center UT of the knife tip 7, a support device 12 for a schematically illustrated grinding device 13 is provided between the hold-down device 9 and the holder 5 of the knife 6. The grinding device 13 has drive connections (not shown in more detail) for an actuating device and an actuating device.

Somit ergibt sich eine erforderliche Messerlänge, die der Summe aus der Lagendicke 14, dem Abstand 15 zwischen der Unterseite des Niederhalters und der Unterseite der Halterung 5 in der dem unteren Totpunkt UT entsprechenden Lage der Messerspitze 7 und dem Abstand 16 zwischen der Oberseite des Borstenbandes 2 und der Lage des unteren Totpunktes UT der Messerspitze 7 entspricht. Es zeigt sich, daß bei im übrigen gleicher Konstruktion lediglich die Lagendicke 14 variable Größe ist.This results in a required knife length, which is the sum of the layer thickness 14, the distance 15 between the underside of the hold-down device and the underside of the holder 5 in the position of the knife tip 7 corresponding to bottom dead center UT, and the distance 16 between the top of the bristle band 2 and corresponds to the position of the bottom dead center UT of the knife tip 7. It turns out that, with the rest of the same construction, only the layer thickness 14 is variable in size.

Beim Schneidvorgang erfolgt ein Vorschub in Richtung des Pfeiles V der Stoffschneidemaschine 1 in der in der linken Hälfte dargestellten Lage, wobei eine oszillierende Hubbewegung über den Hub 8 des durch alle Lagen 4 des Paketes 3 hindurch bis in das Borstenband 2 hineingestochenen, abgesenkten Messers 6 erfolt.During the cutting process, a feed takes place in the direction of arrow V of the fabric cutting machine 1 in the position shown in the left half, an oscillating stroke movement taking place over the stroke 8 of the lowered knife 6 pierced through all layers 4 of the package 3 and into the bristle band 2 .

Beim Schneiden unterliegt das Messer einem Verschleiß über einen Abschnitt, der der Summe aus der Lagendicke 14 und dem Abstand 16 entspricht. Dieser Abschnitt, der im folgenden Schleiflänge genannt wird, muß geschliffen werden, damit ein sicherer und sauberer Zuschnitt möglich ist.When cutting, the knife is subject to wear over a section which corresponds to the sum of the layer thickness 14 and the distance 16. This section, which will be called the grinding length below, must be ground so that a safe and clean cut is possible.

Erpfindungsgemäß wird die Hubbewegung des Messers 6 in dem unteren Totpunkt UT im eingestochenen Zustand stillgesetzt, die Schleifvorrichtung 13 zur Anlage gegen die Messerflächen des Messers 6 bewegt und den Schleifvorgang beginnend in Betrieb gesetzt. Ausgehend von dieser Stellung wird das Messer 6, wie in der rechten Hälfte in Fig. 1 dargestellt, herausgezogen, und unter Schleifen durch die Schleifvorrichtung 13 bewegt, und zwar soweit, bis auch die Messerspitze 7 geschliffen wird, da dies erforderlich ist. Anschließend wird das Messer 6 wieder abgesenkt in die in Fig. 1 in der linken Hälfte dargestellte Lage. Dies wird vorzugsweise regelmäßig wiederholt, und zwar auf jeden Fall jedesmal dann, wenn das Messer aus der Schneidstellung angehoben werden muß, etwa an Ecken eines vorgegebenen Schnittmusters, bei denen ein Drehen der Stoffschneidmaschine 1 außerhalb des Paketes 3 erforderlich ist. Darüber hinaus wird nach einer vorgegebenen und programmierbaren Schneiddauer der Schleifvorgang regelmäßig wiederholt.According to the invention, the stroke movement of the knife 6 is stopped at the bottom dead center UT in the inserted state, the grinding device 13 is moved to bear against the knife surfaces of the knife 6 and the grinding process is started up. Starting from this position, the knife 6 is pulled out, as shown in the right half in FIG. 1, and moved with grinding by the grinding device 13, namely until the knife tip 7 is also ground, since this is necessary. The knife 6 is then lowered again into the position shown in the left half in FIG. 1. This is preferably repeated regularly, and in any case whenever the knife has to be lifted out of the cutting position, for example at corners of a predetermined cutting pattern, in which a rotation of the fabric cutting machine 1 outside the package 3 is required. In addition, the grinding process is repeated regularly after a predetermined and programmable cutting time.

Dies wird anhand Fig. 2 erläutert. Nach einem Schleifvorgang an der Stelle 17 wird das Messer 6 wieder in das Paket 3 abgesenkt, führt eine Schneidbewegung über eine Strecke a durch, wird dort in der erläuterten Weise herausgezogen und dabei mittels der Schleifvorrichtung 13 geschliffen und an dieser Stelle 18 wieder abgesenkt. Dies wird ggfls. mehrfach wiederholt. Bei Erreichen einer Ecke 19 wird beim Herausziehen des Messers 6 dieses ebenfalls in der erläuterten Weise geschliffen, die Stoffschneidemaschine 1 in die durch eine nicht schraffierten Keil dargestellten Lage gedreht und wieder abgesenkt, woraufhin ein neuer Schneidvorgang um eine Strecke a erfolgt, was ebenfalls wiederholt wird. Vorteilhaft wird wie dargestellt, das Abmessen der Strecke a mit jedem neuen Einstechen, wie etwa am Punkt 19, neu begonnen.This is explained with reference to FIG. 2. After a grinding process at point 17, the knife 6 is lowered again into the package 3, carries out a cutting movement over a distance a, is pulled out there in the manner explained and thereby ground by means of the grinding device 13 and lowered again at this point 18. This will, if necessary. repeated several times. When a corner 19 is reached, when the knife 6 is pulled out, it is also ground in the manner described, the fabric cutting machine 1 is rotated into the position represented by a non-hatched wedge and lowered again, whereupon a new cutting process takes place a distance a, which is also repeated. As shown, the measurement of the distance a is advantageously restarted with each new plunge cut, such as at point 19.

Diese Strecke a kann durch Zählen der Hubzyklen beim Schneiden durch Auswerten einer Zeitdauer während des Schneidens, aber auch durch lediglich Längenmessung bestimmt werden. Sie hängt von der Konsistenz der Borsten und vor allem der Lagen 4 des Paketes 3 sowie der Dicke 14 des Paketes ab. Praktisch sind für die Strecke a Werte von 2 bis 4 m zweckmäßig.This distance a can be determined by counting the lifting cycles when cutting, by evaluating a period of time during cutting, but also by simply measuring the length. It depends on the consistency of the bristles and especially the layers 4 of the package 3 and the thickness 14 of the package. In practice, values of 2 to 4 m are expedient for distance a.

Wie anhand Fig. 1 erläutert, ist es erforderlich, auch die Messerspitze 7 zu schleifen. Dies kann zum einen dadurch erfolgen, daß das Messer 6 ohne zusätzlichen Hub so weit angehoben wird, daß die Schleifvorrichtung 13 auch die Messerspitze 7 erreicht. Dies kann, wie in Fig. 1 in dessen rechten Abschnitt dargestellt, auch dadurch erreicht werden, daß bei angehobenem Zustand des Messers 6 zusätzlich eine einzelne Hubbewegung durchgeführt wird, während der die Messerspitze 7 aus ihrem unteren Totpunkt UT in ihren oberen in Strichlinien dargestellten Totpunkt OT gelangt und dabei durch die Schleifvorrichtung 13 geschliffen wird.As explained with reference to FIG. 1, it is also necessary to grind the knife tip 7. On the one hand, this can be done by lifting the knife 6 so far without an additional stroke that the grinding device 13 also reaches the knife tip 7. This can also be achieved, as shown in FIG. 1 in the right section thereof, by additionally carrying out a single lifting movement when the knife 6 is raised, during which the knife tip 7 from its bottom dead center UT in its top dead center shown in broken lines TDC arrives and is ground by the grinding device 13.

Es zeigt sich ferner, daß lediglich eine einzige wirksame Schleifvorrichtung 13 vorgesehen werden muß, deren Bauhöhe so gering wie möglich gestaltet sein kann. Es ist lediglich erforderlich, zu gewährleisten, daß beide Messerflächen geschliffen werden können. Eine solche Schleifvorrichtung 13 geringer Bauhöhe ist beispielsweise eine Walzenschleifeinrichtung oder eine Bandschleifeinrichtung, wie sie in Fig. 3 schematisch dargestellt ist.It also shows that only a single effective grinding device 13 has to be provided, the overall height of which can be made as low as possible. It is only necessary to ensure that both knife surfaces can be ground. Such a grinding device 13 of low overall height is, for example, a roll grinding device or a belt grinding device, as is shown schematically in FIG. 3.

Fig. 3 zeigt im Querschnitt die Klinge des Messers 6 mit den beiden zu schleifenden Messerflächen 21 und 22, wobei übereinander angeordnet zwei endlose Schleifbänder 23 und 24 mittels einer schematisch dargestellten jeweiligen Exenterrolle 25 bzw. 26 gegen die Messerflächen 21,22 gedrückt werden. Die Schleifbänder 25,26 laufen ferner über Umlenkrollen 27,28 bzw. 29,30. Während des Schneidebetriebs ist durch Lösen der Exzenterrollen 25,26 das Schleifband 23 bzw. 24 außer Anlage von den Messerflächen 21 und 22 des Messers 6. Mit Auslösen des Schleifvorganges, d.h. mit Auslösen eines Herausziehens des Messers 6 werden die beiden Exzenterrollen 25,26 durch nicht dargestellte Stelleinrichtungen so ausgelenkt, daß die Schleifbänder 23 und 24 in Anlage gegen die Messerflächen 21 bzw. 22 gelangen. Gleichzeitig wird durch eine ebenfalls nicht dargestellte Antriebseinrichtung jedes Schleifband 23 bzw. 24 in Bewegung gesetzt, d.h. die Schleifvorrichtung 13 in Betrieb genommen. Wird dann das Messer 6 aus der in Fig. 1 in deren linken Abschnitt gezeigten Lage nach oben gezogen, erfolgt das Schleifen der beiden Messerflächen 21 und 22.3 shows in cross section the blade of the knife 6 with the two knife surfaces 21 and 22 to be sharpened, two endless grinding belts 23 and 24 being arranged one above the other by means of a schematically illustrated respective eccentric roller 25 or 26 are pressed against the knife surfaces 21, 22. The sanding belts 25, 26 also run over deflection rollers 27, 28 and 29, 30, respectively. During the cutting operation, by loosening the eccentric rollers 25, 26, the grinding belt 23 or 24 is out of contact with the knife surfaces 21 and 22 of the knife 6. When the grinding process is triggered, ie when the knife 6 is pulled out, the two eccentric rollers 25, 26 become Adjusting devices, not shown, are deflected such that the grinding belts 23 and 24 come into abutment against the knife surfaces 21 and 22, respectively. At the same time, each grinding belt 23 or 24 is set in motion by a drive device, also not shown, ie the grinding device 13 is put into operation. If the knife 6 is then pulled upward from the position shown in FIG. 1 in its left section, the two knife surfaces 21 and 22 are ground.

Falls es die statischen Gegebenheiten, insbesondere die Messersteife erlauben, kann auch beim Wiederabsenken des Messers 6 die Schleifeinrichtung noch in Betrieb bleiben, jedoch ist dies nicht zwingend erforderlich. Vielmehr kann die Strecke a entsprechend so bestimmt werden, daß stets ausreichende Schärfe des Messers 6 vorliegt.If the static conditions, in particular the knife stiffness, allow the grinding device to remain in operation even when the knife 6 is lowered again, this is however not absolutely necessary. Rather, the distance a can be determined accordingly so that there is always sufficient sharpness of the knife 6.

Aus Vorstehendem ergibt sich, daß ein Schleifhub in einfacher Weise lediglich durch Messeraustausch geändert werden kann, da, wie erwähnt, eine Schleiflängenänderung nur dann erforderlich ist, wenn die Dicke 14 des Paketes 3 geändert wird. Bei der Stoffschneidemaschine 1 ist dabei lediglich zu beachten, daß der Hub beim Herausziehen ausreicht, um das Messer 6 vollständig herauszuziehen.It follows from the above that a grinding stroke can be changed in a simple manner only by exchanging knives, since, as mentioned, a change in grinding length is only required if the thickness 14 of the package 3 is changed. In the case of the fabric cutting machine 1, it is only necessary to note that the stroke when pulling out is sufficient to pull the knife 6 out completely.

Die Messer-Lebensdauer kann erhöht werden, da es auf einfache Weise optimierbar ist, in welchen Abständen a das regelmäßige Schleifen erfolgt.The knife life can be increased because it is easy to optimize the intervals a at which the regular grinding takes place.

Claims (10)

Verfahren zum Schleifen der Messerflächen des eine oszillierende Hubewegung ausführenden Messers (6) einer Stoffschneidemaschine (1) mittels einer Schleifvorrichtung (13), bei dem das Messer aus einer in ein Lagenpaket eingestochenen Schneidstellung in eine aus diesem herausgezogene angehobene Stellung angehoben wird,
bei dem die Schleifvorrichtung in einer angehobenen Stellung des Messers in Anlage an die Messerflächen (21,22) gebracht und betrieben ist und
bei dem nach dem Schleifen das Messer wieder in die Schneidstellung abgesenkt wird,
dadurch gekennzeichnet,
daß die Schleif vorrichtung (13) nahe, aber oberhalb der Unterseite eines üblichen Niederhalters (9) vorgesehen ist, daß die Schleifvorrichtung (13) zu Beginn jedes Anhebens des Messers (6) in Anlage an die Messerflächen gebracht wird und betrieben wird und
daß das Messer stets ausgehend von der unteren Totpunktlage seiner oszillierenden Hubbewegung beim Schneidvorgang aus angehoben wird, bis die Messerspitze (7) die Schleifvorrichtung (13) erreicht.Method for sharpening the knife surfaces of the knife (6) of an fabric cutting machine (1) which carries out an oscillating lifting movement by means of a grinding device (13), in which the knife is lifted from a cutting position inserted into a layer package into a raised position pulled out of the latter,
in which the grinding device is brought into contact with the knife surfaces (21, 22) and operated in a raised position of the knife and
in which the knife is lowered back into the cutting position after sharpening,
characterized by
that the grinding device (13) near but above the underside of a conventional hold-down device (9) is provided that the grinding device (13) is brought into contact with the knife surfaces and operated at the start of each lifting of the knife (6) and
that the knife is always raised from the bottom dead center position of its oscillating stroke movement during the cutting process until the knife tip (7) reaches the grinding device (13). Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß bei längs einer Linie erfolgenden Schneidvorschüben in vorgegebenen regelmäßigen Abständen angehoben wird.Method according to claim 1,
characterized by
that is raised at predetermined regular intervals when cutting feeds are carried out along a line. Verfahren nach Anspruch 2,
dadurch gekennzeichnet,
daß das Anheben regelmäßig alle ca. 2 bis 4 Meter erfolgt.Method according to claim 2,
characterized by
that the lifting takes place regularly every approx. 2 to 4 meters. Verfahren nach Anspruch 2 oder 3,
dadurch gekennzeichnet,
daß die Abstände einstellbar, ggfls. automatisch programmierbar sind.Method according to claim 2 or 3,
characterized by
that the distances are adjustable, if necessary. are automatically programmable. Verfahren nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
daß es bei allen Umsetzvorgängen, wie an Ecken (19) eines Zuschnittes oder dgl. durchgeführt wird.Method according to one of claims 1 to 4,
characterized by
that it is carried out in all relocating operations, such as at corners (19) of a blank or the like. Verfahren nach Anspruch 5,
dadurch gekennzeichnet,
daß das Anheben nach den vorgegebenen regelmäßigen Abständen nach jedem Umsetzvorgang neu begonnen wird.Method according to claim 5,
characterized by
that lifting is restarted after the specified regular intervals after each transfer operation. Verfahren nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet,
daß bei dem Wiederabsenken die Schleifvorrichtung (13) noch in Anlage und in Betrieb ist.Method according to one of claims 1 to 6,
characterized by
that when the lowering again, the grinding device (13) is still in contact and in operation. Verfahren nach einem der Ansprüche 1 bis 7,
gekennzeichnet durch
eine Schleifvorrichtung, durch die gleichzeitig beide Messerflächen (21,22) schleifbar sind.Method according to one of claims 1 to 7,
characterized by
a grinding device through which both knife surfaces (21, 22) can be ground simultaneously. Verfahren nach Anspruch 8,
gekennzeichnet durch
eine Band-Schleifvorrichtung mit mindestens einem Schleifband (23,24) pro Messerfläche (21,22).A method according to claim 8,
characterized by
a belt grinding device with at least one grinding belt (23, 24) per knife surface (21, 22). Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 9,
gekennzeichnet durch
eine Band-Schleifvorrichtung (13) mit mindestens einem Band (23,24) pro zu schleifender Messerfläche (21,22), wobei diese mittels einer jeweiligen stellbaren Exzenterrolle (25,26) in Anlage gegen die Messerflächen (21,22) drückbar sind.Device for carrying out the method according to one of claims 1 to 9,
characterized by
a belt grinding device (13) with at least one belt (23, 24) per knife surface (21, 22) to be ground, these being able to be pressed against the knife surfaces (21, 22) by means of a respective adjustable eccentric roller (25, 26) .
EP92109395A 1991-06-04 1992-06-03 Method for sharpening the blade of a machine for cutting fabric Withdrawn EP0517192A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4118329 1991-06-04
DE19914118329 DE4118329C2 (en) 1991-06-04 1991-06-04 Process for grinding the knife of a fabric cutting machine

Publications (1)

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EP0517192A1 true EP0517192A1 (en) 1992-12-09

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104551880A (en) * 2014-12-19 2015-04-29 拓卡奔马机电科技有限公司 Automatic sharpening structure and automatic sharpening process of automatic cutting device
CN110394696A (en) * 2019-07-26 2019-11-01 拓卡奔马机电科技有限公司 The sharpening mouth structure and grooved bit of grooved bit

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0815718B2 (en) * 1993-08-20 1996-02-21 株式会社島精機製作所 Blade width measuring device for cutting blades
DE102008033547A1 (en) * 2008-07-17 2010-01-21 Visonn Gmbh & Co. Kg Grinding and sharpening machine for cutting blades
CN107283231B (en) * 2016-04-05 2023-05-16 王华江 Clamping and positioning device and clamping and positioning method of sharpening equipment

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2281023A (en) * 1940-01-19 1942-04-28 Eastman Machine Co Knife sharpening mechanism for cutting machines
FR2007871A1 (en) * 1968-05-06 1970-01-16 Cincinnati Milling Machine Co
FR2014019A1 (en) * 1968-07-31 1970-04-10 Cincinnati Milling Machine Co
US3714742A (en) * 1971-07-15 1973-02-06 Eastman Machine Co Knife sharpening mechanism
US4033214A (en) * 1973-09-17 1977-07-05 Gerber Garment Technology, Inc. Blade sharpener
EP0241645A1 (en) * 1986-04-16 1987-10-21 Investronica S.A. Improved blade sharpening and guide mechanism

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3547607A (en) * 1969-01-06 1970-12-15 Maimin Co Inc H Belt-grinder sharpener assembly for cloth cutting machine
US4294047A (en) * 1980-01-14 1981-10-13 Gerber Garment Technology, Inc. Method of sharpening lateral edges and end edges of a blade during reciprocation thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2281023A (en) * 1940-01-19 1942-04-28 Eastman Machine Co Knife sharpening mechanism for cutting machines
FR2007871A1 (en) * 1968-05-06 1970-01-16 Cincinnati Milling Machine Co
FR2014019A1 (en) * 1968-07-31 1970-04-10 Cincinnati Milling Machine Co
US3714742A (en) * 1971-07-15 1973-02-06 Eastman Machine Co Knife sharpening mechanism
US4033214A (en) * 1973-09-17 1977-07-05 Gerber Garment Technology, Inc. Blade sharpener
EP0241645A1 (en) * 1986-04-16 1987-10-21 Investronica S.A. Improved blade sharpening and guide mechanism

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104551880A (en) * 2014-12-19 2015-04-29 拓卡奔马机电科技有限公司 Automatic sharpening structure and automatic sharpening process of automatic cutting device
CN110394696A (en) * 2019-07-26 2019-11-01 拓卡奔马机电科技有限公司 The sharpening mouth structure and grooved bit of grooved bit
CN110394696B (en) * 2019-07-26 2020-12-29 拓卡奔马机电科技有限公司 Sharpening structure for perforating drill and perforating drill

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DE4118329C2 (en) 1996-01-18

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