EP1582318B1 - Knife for a motor driven cutting machine - Google Patents

Knife for a motor driven cutting machine Download PDF

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Publication number
EP1582318B1
EP1582318B1 EP05005663A EP05005663A EP1582318B1 EP 1582318 B1 EP1582318 B1 EP 1582318B1 EP 05005663 A EP05005663 A EP 05005663A EP 05005663 A EP05005663 A EP 05005663A EP 1582318 B1 EP1582318 B1 EP 1582318B1
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EP
European Patent Office
Prior art keywords
knife
cutting
wedge angle
cutting edge
stick region
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EP05005663A
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German (de)
French (fr)
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EP1582318A1 (en
Inventor
Uwe Dipl.-Ing. Reifenhäuser
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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
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/002—Materials or surface treatments therefor, e.g. composite materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/0046—Cutting members therefor rotating continuously about an axis perpendicular to the edge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/0053—Cutting members therefor having a special cutting edge section or blade section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/006—Cutting members therefor the cutting blade having a special shape, e.g. a special outline, serrations

Definitions

  • the invention relates to a knife for a motor-driven cutting machine for cutting food, in particular sausages, cheese, vegetables and the like, with a rear side facing the loaf of the food during operation of the cutting machine and with a front side facing away from the loaf with at least one clamping area the knife is connectable with a drive member of the cutting machine, as well as with a cutting edge which extends in a substantially parallel to the back and front cutting plane and at which the back and the front converge at an acute wedge angle, with an adjacent to the cutting edge and substantially parallel to this limited smoothly polished wedge angle surface having a surface roughness depth of between 1 and 10 ⁇ m and a knife view surface disposed on a side of the wedge angle surface facing away from the cutting edge.
  • a knife is known, for example, from US-5,988,033.
  • surface roughness depth is understood to mean the proportion of a measured distance between the top of a survey and the valley of a nearby depression in the surface, which is perpendicular to a reference surface determined by averaging over the surface.
  • the surface roughness depth is referred to as a statistical mean value of this length value.
  • Knives of the type described above are well known in a variety of designs for a long time.
  • the wedge angle for high performance slicers, for industrial use is about 20 ° to 25 °
  • the width of the wedge angle surface is between 0.1 and 5 mm, usually between 0.2 and 3 mm. This surface is typically smoothed and sized.
  • the wedge angle surface is adjoined by a concavely curved region, which extends in the transition to the wedge angle surface approximately parallel to the cutting plane, so that Due to the removal of material during regrinding of the knife, the surface to be ground is not or only slightly increased.
  • the transition between the wedge-angled surface and the concavely curved region forms a so-called "spoiler edge" at which the slice cut by the cutting edge is to be released from the surface of the knife.
  • spoke edge at which the slice cut by the cutting edge is to be released from the surface of the knife.
  • the cut slices are thus not stored clean, but uncontrollably moved by excessive friction and consequent excessive momentum transfer to the discs.
  • the material to be cut is pulled together by the moving blade surface, which is considered particularly in packaged SB foods as quality degradation.
  • the invention has for its object to propose a knife for a motor-driven cutting machine, which avoids the adhesion of cut from the loaf food slices.
  • a non-stick area is proposed according to the invention, which adjoins directly to the wedge angle surface and forms part of the Messeransichts simulation, the non-stick area having a surface roughness between 50 and 600 .mu.m , preferably between 200 and 400 .mu.m .
  • the non-stick area is limited substantially parallel to the cutting edge, and the knife-viewing area has a surface roughness depth which is significantly lower than that in the non-stick area.
  • Any limitation on the size of the non-stick area makes it possible, since its manufacture is costly, to produce the knife according to the invention at lower cost.
  • the desired detachment of the material to be cut from the knife is already reliably achieved by a narrow - with a width of a few millimeters to about a few centimeters - strip-shaped parallel to the cutting edge formed non-stick area.
  • the processing of the adjacent knife viewing surface can then be kept much less expensive.
  • the said surface roughness corresponds in particular to the initial state of an unprocessed blank produced from sheet material.
  • a non-stick area is formed on a knife according to the invention only on the front side facing away from the loaf of the food. Also by this measure, the manufacturing cost of the knife according to the invention are kept as low as possible.
  • adhesions of the uncut loaf to the rear of the knife are less critical, as they do not directly affect the optical quality of the cut (with the above-mentioned criteria of filing and cutting quality).
  • the uncut loaf also sticks to the cut slice significantly higher strength only for a short time and is not significantly deformed by the adhesion.
  • the adhesion of the loaf at the back of the knife can be effectively avoided by other, cheaper measures - such as by an undercut training the knife on the back (hollow grinding).
  • the inclination of the wedge angle surface with respect to the cutting plane is greater on a knife according to the invention than the inclination of the non-stick region relative to the cutting plane.
  • the boundary between the wedge angle surface and the non-stick region is advantageously marked by a tear-off edge in a surface contour of the knife.
  • the non-stick region of a knife according to the invention has an engraved or embossed structure.
  • a variety of known, mature and inexpensive methods are available for the machining or forming of such a structure.
  • the structure in the non-stick region of such a knife according to the invention preferably consists of essentially parallel lines.
  • Such a regular structure can be produced particularly easily both by machining and by forming.
  • the lines should be approximately perpendicular to the cutting edge or to the boundary between the wedge angle surface and the non-stick area.
  • the lines may also be inclined in the cutting direction to the cutting edge, so that the lines pass approximately perpendicular to the feed direction of the cutting material.
  • the lines then form a series of successive "tear-off edges", which in turn can improve the detachment of the material to be cut.
  • These lines which characterize the non-stick area of such a knife according to the invention preferably each have a length of between 5 and 15 mm and extend parallel to one another at a distance of between 0.2 and 2 mm. Such structuring has been found to be particularly effective.
  • the structure in the non-stick area of such a knife according to the invention is advantageously introduced by means of laser processing.
  • laser processing also offers the possibility of providing hardened knife steels with the described structuring.
  • surface structures with parameters that are largely constant even in the microscopic range can be produced by means of laser processing and in a quite economical manner.
  • the non-stick area is preferably arranged in a concave area of the surface of the knife, the distance between the cutting edge and the boundary between wedge angle area and non-stick area is between 0.1 and 5 mm, preferably between 0.2 and 3 mm.
  • a knife according to the invention may have a cutting edge which is curved in the cutting plane, such a knife being able to be rotated in rotation about an axis of rotation perpendicular to the cutting plane during operation of the cutting machine.
  • Such knives are used in particular in industrial cutting machines for high cutting speeds, so-called "slicers".
  • a knife according to the invention may also have a straight cutting edge, the knife being clamped at opposite ends and translationally movable in the cutting plane during operation of the cutting machine.
  • Such knives are used, for example, in bread slicing machines, in particular with knife gates, and in so-called roll dividers for the retail trade.
  • the knife according to the invention can be produced very economically that the surface in the non-stick area of the material of the knife body, that is made of metal, is formed.
  • the possibility of dispensing with any type of coating saves costs and leads to a long shelf life because a wear or detachment of a coating can not occur.
  • the knife 1 according to the invention shown in the figures is suitable for operation in a motor-driven cutting machine not shown - a so-called "slicer” - for cutting not shown, in particular loafed foods such as sausages and cheese, but also of lumpy vegetables such as cucumbers or cabbage and provided.
  • the knife 1 is in a central standardized clamping area 2 with a drive member of the cutting machine, not shown, in particular a shaft journal, connected and rotatable with this about its axis of rotation 3. Due to the spirally coiled cutting edge 4 of the knife 1, this has, following the transition from the largest radius 5 to the smallest radius 6 an approximately triangular gap 7, which allows for each revolution of the knife further feeding of the food to the desired slice thickness, without an additional feed movement in the cutting plane 8 would be required.
  • the rear side 9 of the knife 1 (not shown in FIGS. 1 and 2) is intended for the loaf to be sliced or the lumpy vegetables, the front side 10 for the cut slices.
  • the back 9 has for the purpose of reducing material and to improve the cutting quality on a concave undercut 11 in the form of a hollow grinding.
  • the knife 1 On the front 10, the knife 1 has a smooth ground wedge angle surface 12 with a - projected to the cutting plane 8 - width 13 of about 0.5 mm, which includes a wedge angle 14 of 23 ° with the back 9.
  • the wedge angle surface 12 is adjoined by a concave region 15 with (again projected) width 16 of approximately 40 mm and a region 17 parallel to the cutting plane 8.
  • a tear-off edge 18 running parallel to the cutting edge 4 is formed.
  • the central knife-facing surface 22 on the front surface 10 adds to the wedge-angle surface 12 to the total area of the front surface 10.
  • the surface of the parallel region 17 and the surface of the concave region 15 together form the knife-facing surface 22.
  • the non-stick region 19 forms part of the concave region 15, namely the wedge angle surface 12 facing.
  • the knife 1 Immediately following the tear-off edge 18, already in the concave area 15, the knife 1 has an anti-adhesion area 19 with a structure engraved by laser processing.
  • the engraved structure consists of lines 20 which extend parallel to one another and are substantially perpendicular to the tear-off edge 18.
  • the lines 20 have a length 21 of 10 mm which is essentially constant over the entire length of the tear-off edge 18, a distance of approximately 1.5 mm , a width of 0.3 mm and a depth of 0.3 mm. Distance, width and depth of the lines 20 are not dimensioned in the figures.
  • the lines 20 are introduced by means of laser processing.

Abstract

The knife has a back (9) and a turned front (10). A clamp is provided and connected to a cutting edge. A cutting plane (8) runs parallel to the back and front and is under a pointed wedge angle (14) with the cutting edge parallel to it. The surface is polished with a surface roughness depth between 1 and 10 micro meters. The side of the wedge angle surface (12) is turned away on from the cutting edge. Part of the measuring is exposed forming a non- adhesive surface (19) with a surface roughness depth between 50 and 600 micrometers.

Description

Die Erfindung betrifft ein Messer für eine motorgetriebene Schneidmaschine zum Schneiden von Lebensmitteln, insbesondere von Wurstwaren, Käse, Gemüse und dergleichen, mit einer im Betrieb der Schneidmaschine einem Laib des Lebensmittels zugewandten Rückseite und mit einer dem Laib abgewandten Vorderseite, mit mindestens einem Einspannbereich, in dem das Messer mit einem Antriebsorgan der Schneidmaschine verbindbar ist, sowie mit einer Schneidkante, die in einer im Wesentlichen zu Rückseite und Vorderseite parallelen Schnittebene verläuft und an der die Rückseite und die Vorderseite unter einem spitzen Keilwinkel aufeinander zulaufen, mit einer an die Schneidkante angrenzenden und im Wesentlichen parallel zu dieser begrenzten, glatt geschliffenen Keilwinkelfläche mit einer Oberflächenrauhtiefe zwischen 1 und 10 µm und mit einer Messeransichtsfläche, die auf einer der Schneidkante abgewandten Seite der Keilwinkelfläche angeordnet ist. Ein solches Messer ist, z.B., aus der US-5,988,033 bekannt.The invention relates to a knife for a motor-driven cutting machine for cutting food, in particular sausages, cheese, vegetables and the like, with a rear side facing the loaf of the food during operation of the cutting machine and with a front side facing away from the loaf with at least one clamping area the knife is connectable with a drive member of the cutting machine, as well as with a cutting edge which extends in a substantially parallel to the back and front cutting plane and at which the back and the front converge at an acute wedge angle, with an adjacent to the cutting edge and substantially parallel to this limited smoothly polished wedge angle surface having a surface roughness depth of between 1 and 10 μm and a knife view surface disposed on a side of the wedge angle surface facing away from the cutting edge. Such a knife is known, for example, from US-5,988,033.

Unter Oberflächenrauhtiefe wird im Rahmen dieser Anmeldung der Anteil eines gemessenen Abstands zwischen der Spitze einer Erhebung und dem Tal einer naheliegenden Vertiefung in der Oberfläche, der auf einer durch Mittelung über der Oberfläche ermittelten Referenzfläche senkrecht steht, verstanden. Bei im Bereich der gemessenen Größenordnung im Wesentlichen zufällig entstandenen Oberflächenstrukturen - beispielsweise im mikroskopischen Bereich bei urgeformten Oberflächen - wird als Oberflächenrauhtiefe ein statistischer Mittelwert dieses Längenwertes bezeichnet.For the purposes of this application, surface roughness depth is understood to mean the proportion of a measured distance between the top of a survey and the valley of a nearby depression in the surface, which is perpendicular to a reference surface determined by averaging over the surface. In the case of surface structures which have essentially arisen randomly in the region of the measured magnitude-for example, in the microscopic range in the case of originally shaped surfaces-the surface roughness depth is referred to as a statistical mean value of this length value.

Messer der eingangs beschriebenen Art sind in einer Vielzahl von Ausführungen seit langem allgemein bekannt. Typischer Weise beträgt der Keilwinkel bei Hochleistungsschneidmaschinen, sogenannten "Slicern", für den industriellen Einsatz etwa 20° bis 25°, die Breite der Keilwinkelfläche beträgt zwischen 0,1 und 5 mm, in der Regel zwischen 0,2 und 3 mm. Diese Fläche ist typischer Weise glatt geschliffen und geschlichtet. An die Keilwinkelfläche schließt sich ein konkav gewölbter Bereich an, der im Übergang zur Keilwinkelfläche etwa parallel zu der Schnittebene verläuft, so dass sich durch den Materialabtrag beim Nachschleifen des Messers die zu schleifende Fläche nicht oder nur ganz unwesentlich vergrößert.Knives of the type described above are well known in a variety of designs for a long time. Typically, the wedge angle for high performance slicers, for industrial use is about 20 ° to 25 °, the width of the wedge angle surface is between 0.1 and 5 mm, usually between 0.2 and 3 mm. This surface is typically smoothed and sized. The wedge angle surface is adjoined by a concavely curved region, which extends in the transition to the wedge angle surface approximately parallel to the cutting plane, so that Due to the removal of material during regrinding of the knife, the surface to be ground is not or only slightly increased.

Im Betrieb der bekannten Messer bildet der Übergang zwischen Keilwinkelfläche und dem konkav gewölbten Bereich eine sogenannte "Abrisskante", an der sich die mit der Schneidkante geschnittene Scheibe von der Oberfläche des Messers lösen soll. Bei Verwendung der bekannten Messer entsteht jedoch - insbesondere beim Schneiden feuchter sowie fettiger Produkte - häufig ein schlechtes Ablagebild und eine geringe Schneidqualität, weil diese Produkte auch über die Abrisskante hinaus an der Messerfläche anhaften. Die geschnittenen Scheiben werden dadurch nicht sauber abgelegt, sondern durch zu große Reibung und dadurch bedingte zu große Impulsübertragung auf die Scheiben unkontrolliert bewegt. Außerdem wird das Schneidgut durch die bewegte Messerfläche zusammengezogen, was insbesondere bei verpackten SB-Lebensmitteln als Qualitätsbeeinträchtigung angesehen wird.During operation of the known knives, the transition between the wedge-angled surface and the concavely curved region forms a so-called "spoiler edge" at which the slice cut by the cutting edge is to be released from the surface of the knife. However, when using the known knives - especially when cutting wet and greasy products - often creates a poor storage image and a low cutting quality, because these products also adhere to the tear-off edge on the blade surface. The cut slices are thus not stored clean, but uncontrollably moved by excessive friction and consequent excessive momentum transfer to the discs. In addition, the material to be cut is pulled together by the moving blade surface, which is considered particularly in packaged SB foods as quality degradation.

Aufgabe der ErfindungObject of the invention

Der Erfindung liegt die Aufgabe zugrunde, ein Messer für eine motorgetriebene Schneidmaschine vorzuschlagen, das das Anhaften der von dem Laib geschnittenen Lebensmittelscheiben vermeidet.The invention has for its object to propose a knife for a motor-driven cutting machine, which avoids the adhesion of cut from the loaf food slices.

Lösungsolution

Ausgehend von den bekannten Messern wird nach der Erfindung ein Antihaftbereich vorgeschlagen, der sich unmittelbar an die Keilwinkelfläche anschließt und einen Teil der Messeransichtsfläche bildet, wobei der Antihaftbereich eine Oberflächenrauhtiefe zwischen 50 und 600 µm, vorzugsweise zwischen 200 und 400 µm aufweist.Starting from the known knives, a non-stick area is proposed according to the invention, which adjoins directly to the wedge angle surface and forms part of the Messeransichtsfläche, the non-stick area having a surface roughness between 50 and 600 .mu.m , preferably between 200 and 400 .mu.m .

In einem derart profilierten Antihaftbereich haftet aufgrund des an sich aus anderen Technikgebieten bekannten "Lotoseffekts" das Produkt in weitaus geringerem Maß, als dies bei einer glatt geschliffenen Oberfläche der Fall ist: Feuchtigkeit und Fett können die in der Oberfläche ausgebildeten Vertiefungen nicht ausfüllen und stehen daher nur auf den Erhebungen mit dem Messer in Kontakt. Diese Verminderung der Kontaktfläche des Schneidguts im mikroskopischen Bereich führt auch makroskopisch zu deutlich geringeren Haft- und Reibungseffekten zwischen Schneidgut und Messeroberfläche.In such a profiled non-stick area due to the known from other fields of technology "lotus effect" the product adheres to a much lesser extent than is the case with a smooth ground surface: moisture and fat can in the surface formed depressions do not fill and therefore are only on the surveys with the knife in contact. This reduction in the contact surface of the material to be cut in the microscopic range also leads macroscopically to significantly lower adhesion and friction effects between material to be cut and the surface of the knife.

Die Anordnung eines solchen Antihaftbereichs unmittelbar im Anschluss an die Keilwinkelfläche bewirkt ein frühzeitiges Ablösen einer Schneidgutscheibe von dem Messer. Insbesondere durch die hohen Schnittgeschwindigkeiten, wie sie an industriellen Schneidmaschinen auftreten, wird dieses Ablösen gefördert und ein erneutes Anlagern vermieden.The provision of such a non-stick area immediately following the wedge-angle surface causes premature detachment of a slice of product from the knife. In particular, by the high cutting speeds, as they occur on industrial cutting machines, this detachment is promoted and avoided re-investing.

In einer bevorzugten Ausführungsform des erfindungsgemäßen Messers ist der Antihaftbereich im Wesentlichen parallel zu der Schneidkante begrenzt und die Messeransichtsfläche weist eine Oberflächenrauhtiefe auf, die deutlich geringer ist als die in dem Antihaftbereich. Jede Begrenzung der Größe des Antihaftbereichs ermöglicht - da dessen Herstellung aufwändig ist - eine preisgünstigere Herstellung des erfindungsgemäßen Messers. Gerade bei Messern für industrielle Schneidmaschinen wird die gewünschte Ablösung des Schneidguts von dem Messer bereits durch einen schmalen - mit einer Breite von wenigen Millimetern bis ca. wenigen Zentimetern - streifenförmig parallel zu der Schneidkante ausgebildeten Antihaftbereich zuverlässig erreicht. Die Bearbeitung der angrenzenden Messeransichtsfläche kann dann deutlich weniger aufwändig gehalten werden. Die genannte Oberflächenrauhtiefe entspricht insbesondere dem Ausgangszustand eines aus Blechmaterial hergestellten, unbearbeiteten Rohlings.In a preferred embodiment of the knife according to the invention, the non-stick area is limited substantially parallel to the cutting edge, and the knife-viewing area has a surface roughness depth which is significantly lower than that in the non-stick area. Any limitation on the size of the non-stick area makes it possible, since its manufacture is costly, to produce the knife according to the invention at lower cost. Especially with knives for industrial cutting machines, the desired detachment of the material to be cut from the knife is already reliably achieved by a narrow - with a width of a few millimeters to about a few centimeters - strip-shaped parallel to the cutting edge formed non-stick area. The processing of the adjacent knife viewing surface can then be kept much less expensive. The said surface roughness corresponds in particular to the initial state of an unprocessed blank produced from sheet material.

Besonders bevorzugt ist an einem erfindungsgemäßen Messer nur auf der dem Laib des Lebensmittels abgewandten Vorderseite ein Antihaftbereich ausgebildet. Auch durch diese Maßnahme werden die Herstellungskosten des erfindungsgemäßen Messers möglichst gering gehalten. Anhaftungen des ungeschnittenen Laibs an der Rückseite des Messers sind einerseits weniger kritisch, da sie sich nicht unmittelbar auf die optische Qualität des Schnittguts (mit den oben genannten Kriterien Ablagebild und Schneidqualität) auswirken. Der ungeschnittene Laib haftet auch durch die im Vergleich zur geschnittenen Scheibe deutlich höhere Festigkeit nur kurzfristig an und wird durch die Anhaftung nicht wesentlich verformt. Darüber hinaus kann die Anhaftung des Laibs an der Rückseite des Messers auch durch andere, preisgünstigere Maßnahmen - wie beispielsweise durch eine hinterschnittene Ausbildung des Messers an der Rückseite (Hohlschliff) - wirksam vermieden werden.Particularly preferably, a non-stick area is formed on a knife according to the invention only on the front side facing away from the loaf of the food. Also by this measure, the manufacturing cost of the knife according to the invention are kept as low as possible. On the one hand, adhesions of the uncut loaf to the rear of the knife are less critical, as they do not directly affect the optical quality of the cut (with the above-mentioned criteria of filing and cutting quality). The uncut loaf also sticks to the cut slice significantly higher strength only for a short time and is not significantly deformed by the adhesion. In addition, the adhesion of the loaf at the back of the knife can be effectively avoided by other, cheaper measures - such as by an undercut training the knife on the back (hollow grinding).

Vorzugsweise ist an einem erfindungsgemäßen Messer die Neigung der Keilwinkelfläche gegenüber der Schnittebene größer, als die Neigung des Antihaftbereichs gegenüber der Schnittebene. Insbesondere ist vorteilhaft die Grenze zwischen der Keilwinkelfläche und dem Antihaftbereich durch eine Abrisskante in einer Oberflächenkontur des Messers markiert. Hierdurch wird die Ablösung der geschnittenen Scheibe, die sich beim Schneidvorgang relativ zum Messer von der Schneidkante über die Keilwinkelfläche und den Antihaftbereich in Richtung der Messeransichtsfläche bewegt, weiter verbessert, weil die Massenträgheit der geschnittenen Scheibe deren - insbesondere scharfkantiger - Umlenkung entgegensteht.Preferably, the inclination of the wedge angle surface with respect to the cutting plane is greater on a knife according to the invention than the inclination of the non-stick region relative to the cutting plane. In particular, the boundary between the wedge angle surface and the non-stick region is advantageously marked by a tear-off edge in a surface contour of the knife. As a result, the detachment of the cut slice, which moves relative to the knife from the cutting edge over the wedge angle surface and the non-stick area in the direction of the knife surface, further improves because the inertia of the cut slice - especially sharp edges - deflection precludes.

Fertigungstechnisch vorteilhaft weist der Antihaftbereich eines erfindungsgemäßen Messers eine gravierte oder geprägte Struktur auf. Eine Vielzahl bekannter, ausgereifter und kostengünstiger Verfahren stehen zur spanabhebenden oder umformenden Gestaltung einer solchen Struktur zur Verfügung.In terms of manufacturing technology, the non-stick region of a knife according to the invention has an engraved or embossed structure. A variety of known, mature and inexpensive methods are available for the machining or forming of such a structure.

Bevorzugt besteht die Struktur im Antihaftbereich eines solchen erfindungsgemäßen Messers aus im Wesentlichen parallelen Linien. Eine solche regelmäßige Struktur lässt sich sowohl spanabhebend wie umformend besonders einfach herstellen. Die Linien sollten insbesondere ungefähr senkrecht zu der Schneidkante beziehungsweise zu der Grenze zwischen Keilwinkelfläche und Antihaftbereich verlaufen. Die Linien können zusätzlich in Schnittrichtung auf die Schneidkante zu geneigt sein, so dass die Linien etwa senkrecht zur Vorschubrichtung das Schneidgut passieren. Die Linien bilden dann eine Reihe aufeinander folgender "Abrisskanten", wodurch wiederum das Ablösen des Schneidguts verbessert werden kann.The structure in the non-stick region of such a knife according to the invention preferably consists of essentially parallel lines. Such a regular structure can be produced particularly easily both by machining and by forming. In particular, the lines should be approximately perpendicular to the cutting edge or to the boundary between the wedge angle surface and the non-stick area. The lines may also be inclined in the cutting direction to the cutting edge, so that the lines pass approximately perpendicular to the feed direction of the cutting material. The lines then form a series of successive "tear-off edges", which in turn can improve the detachment of the material to be cut.

Wenn die Linien erst in der Abrisskante enden, weist diese eine sägezahnartig "gezackte" Struktur auf, wodurch das Ablösen des Schnittguts von der Messeroberfläche zusätzlich befördert wird. Durch den Verlauf der Linien senkrecht zu der Schneidkante bleibt diese gezackte Struktur auch beim Nachschleifen des erfindungsgemäßen Messers erhalten.If the lines end only in the spoiler edge, this has a sawtooth "jagged" structure, whereby the detachment of the clippings is additionally transported by the knife surface. As a result of the course of the lines perpendicular to the cutting edge, this serrated structure also remains when regrinding the knife according to the invention.

Vorzugsweise weisen diese den Antihaftbereich eines solchen erfindungsgemäßen Messers kennzeichnenden Linien jeweils eine Länge zwischen 5 und 15 mm auf und verlaufen in einem Abstand zwischen 0,2 und 2 mm zueinander parallel. Eine derartige Strukturierung hat sich als besonders effektiv gezeigt.These lines which characterize the non-stick area of such a knife according to the invention preferably each have a length of between 5 and 15 mm and extend parallel to one another at a distance of between 0.2 and 2 mm. Such structuring has been found to be particularly effective.

Die Struktur im Antihaftbereich eines solchen erfindungsgemäßen Messers ist vorteilhafter Weise mittels Laserbearbeitung eingebracht. Die Laserbearbeitung bietet zum Einen auch die Möglichkeit, gehärtete Messerstähle mit der beschriebenen Strukturierung zu versehen. Darüber hinaus können mittels Laserbearbeitung Oberflächenstrukturen mit auch im mikroskopischen Bereich weitgehend konstanten Parameter erzeugt werden und dies auf recht wirtschaftliche Weise.The structure in the non-stick area of such a knife according to the invention is advantageously introduced by means of laser processing. On the one hand, laser processing also offers the possibility of providing hardened knife steels with the described structuring. In addition, surface structures with parameters that are largely constant even in the microscopic range can be produced by means of laser processing and in a quite economical manner.

An einem erfindungsgemäßen Messer ist bevorzugt der Antihaftbereich in einem konkaven Bereich der Oberfläche des Messers angeordnet, der Abstand zwischen der Schneidkante und der Grenze zwischen Keilwinkelfläche und Antihaftbereich liegt zwischen 0,1 und 5 mm, vorzugsweise zwischen 0,2 und 3 mm. Diese Merkmale entsprechen der Gestaltung des aus dem Stand der Technik bekannten Messers, so dass das erfindungsgemäße Messer ohne Modifikation einer vorhandenen Schneidmaschine als Ersatz für ein konventionelles Messer zum Einsatz kommen kann.On a knife according to the invention, the non-stick area is preferably arranged in a concave area of the surface of the knife, the distance between the cutting edge and the boundary between wedge angle area and non-stick area is between 0.1 and 5 mm, preferably between 0.2 and 3 mm. These features correspond to the design of the knife known from the prior art, so that the knife according to the invention can be used without modification of an existing cutting machine as a replacement for a conventional knife.

Ein erfindungsgemäßes Messer kann einerseits eine in der Schnittebene gekrümmte Schneidkante aufweisen, wobei ein solches Messer im Betrieb der Schneidmaschine um eine zu der Schnittebene senkrechte Drehachse rotatorisch bewegbar ist. Solche Messer kommen insbesondere in industriellen Schneidmaschinen für hohe Schnittgeschwindigkeiten, sogenannten "Slicern", zum Einsatz.On the one hand, a knife according to the invention may have a cutting edge which is curved in the cutting plane, such a knife being able to be rotated in rotation about an axis of rotation perpendicular to the cutting plane during operation of the cutting machine. Such knives are used in particular in industrial cutting machines for high cutting speeds, so-called "slicers".

Alternativ kann ein erfindungsgemäßes Messer auch eine geradlinig ausgebildete Schneidkante aufweisen, wobei das Messer an gegenüber liegenden Enden eingespannt und im Betrieb der Schneidmaschine in der Schnittebene translatorisch bewegbar ist. Derartige Messer werden beispielsweise in Brotschneidemaschinen, insbesondere mit Messergattern, und in sogenannten Brötchenteilern für den Einzelhandel eingesetzt.Alternatively, a knife according to the invention may also have a straight cutting edge, the knife being clamped at opposite ends and translationally movable in the cutting plane during operation of the cutting machine. Such knives are used, for example, in bread slicing machines, in particular with knife gates, and in so-called roll dividers for the retail trade.

Schließlich lässt sich das Messer nach der Erfindung dadurch sehr wirtschaftlich herstellen, dass die Oberfläche im Antihaftbereich von dem Material des Messerkörpers, das heißt aus Metall, gebildet wird. Die Möglichkeit des Verzichts auf jegliche Art der Beschichtung spart Kosten und führt zu einer langen Haltbarkeit, weil ein Abnutzen oder Ablösen einer Beschichtung nicht auftreten kann.Finally, the knife according to the invention can be produced very economically that the surface in the non-stick area of the material of the knife body, that is made of metal, is formed. The possibility of dispensing with any type of coating saves costs and leads to a long shelf life because a wear or detachment of a coating can not occur.

Ausführungsbeispielembodiment

Die Erfindung wird nachfolgend beispielhaft anhand von Zeichnungsfiguren erläutert. Diese zeigen in

Fig. 1
die Vorderseite eines erfindungsgemäßen Messers und
Fig. 2
ein Detail dieser Vorderseite,
Fig. 3
einen Schnitt durch dieses Messer senkrecht zur Schnittebene und
Fig. 4
ein Detail dieses Schnitts.
The invention is explained below by way of example with reference to drawing figures. These show in
Fig. 1
the front of a knife according to the invention and
Fig. 2
a detail of this front,
Fig. 3
a section through this knife perpendicular to the cutting plane and
Fig. 4
a detail of this section.

Das in den Figuren dargestellte erfindungsgemäße Messer 1 ist zum Betrieb in einer nicht weiter dargestellten motorgetriebenen Schneidmaschine - einem sogenannten "Slicer" - zum Schneiden von gleichfalls nicht dargestellten, insbesondere laibförmigen Lebensmitteln wie Wurstwaren und Käse, aber auch von stückigem Gemüse wie Salatgurken oder Weißkohl geeignet und vorgesehen.The knife 1 according to the invention shown in the figures is suitable for operation in a motor-driven cutting machine not shown - a so-called "slicer" - for cutting not shown, in particular loafed foods such as sausages and cheese, but also of lumpy vegetables such as cucumbers or cabbage and provided.

Das Messer 1 ist in einem zentralen standardisierten Einspannbereich 2 mit einem nicht dargestellten Antriebsorgan der Schneidmaschine, insbesondere einem Wellenzapfen, verbindbar und mit diesem um seine Rotationsachse 3 rotierbar. Aufgrund der spiralig gewendelten Schneidkante 4 des Messers 1 weist dieses im Anschluss an den Übergang vom größten Radius 5 zum kleinsten Radius 6 einen etwa dreiecksförmigen Zwischenraum 7 auf, der bei jeder Umdrehung des Messers einen weiteren Vorschub des Lebensmittels um die gewünschte Scheibendicke ermöglicht, ohne dass eine zusätzliche Zustellbewegung in der Schnittebene 8 erforderlich wäre.The knife 1 is in a central standardized clamping area 2 with a drive member of the cutting machine, not shown, in particular a shaft journal, connected and rotatable with this about its axis of rotation 3. Due to the spirally coiled cutting edge 4 of the knife 1, this has, following the transition from the largest radius 5 to the smallest radius 6 an approximately triangular gap 7, which allows for each revolution of the knife further feeding of the food to the desired slice thickness, without an additional feed movement in the cutting plane 8 would be required.

Im Betrieb ist die (in den Figuren 1 und 2 nicht dargestellte) Rückseite 9 des Messers 1 dem aufzuschneidenden Laib oder dem stückigen Gemüse, die Vorderseite 10 den abgeschnittenen Scheiben zugewandt. Die Rückseite 9 weist zwecks Materialreduzierung sowie zur Verbesserung der Schneidqualität eine konkave Hinterschneidung 11 in Form eines Hohlschliffs auf.In operation, the rear side 9 of the knife 1 (not shown in FIGS. 1 and 2) is intended for the loaf to be sliced or the lumpy vegetables, the front side 10 for the cut slices. The back 9 has for the purpose of reducing material and to improve the cutting quality on a concave undercut 11 in the form of a hollow grinding.

Auf der Vorderseite 10 weist das Messer 1 eine glatt geschliffene Keilwinkelfläche 12 mit einer - auf die Schnittebene 8 projizierten - Breite 13 von ca. 0,5 mm auf, die mit der Rückseite 9 einen Keilwinkel 14 von 23 ° einschließt. An die Keilwinkelfläche 12 schließt sich ein konkaver Bereich 15 mit (wiederum projizierter) Breite 16 von ca. 40 mm und ein zu der Schnittebene 8 paralleler Bereich 17 an. Zwischen der Keilwinkelfläche 12 und dem hier zunächst zu der Schneidkante 4 parallelen, konkaven Bereich 15 ist eine zu der Schneidkante 4 parallel verlaufende Abrisskante 18 ausgebildet. Die auf der Vorderseite 10 befindliche zentrale Messeransichtsfläche 22 addiert sich mit der Keilwinkelfläche 12 zu der Gesamtfläche der Vorderseite 10. Die Fläche des parallelen Bereichs 17 und die Fläche des konkaven Bereichs 15 ergeben zusammen die Messeransichtsfläche 22. Der Antihaftbereich 19 bildet einen Teil des konkaven Bereichs 15, und zwar den der Keilwinkelfläche 12 zugewandten.On the front 10, the knife 1 has a smooth ground wedge angle surface 12 with a - projected to the cutting plane 8 - width 13 of about 0.5 mm, which includes a wedge angle 14 of 23 ° with the back 9. The wedge angle surface 12 is adjoined by a concave region 15 with (again projected) width 16 of approximately 40 mm and a region 17 parallel to the cutting plane 8. Between the wedge-angled surface 12 and the concave region 15, which is initially parallel to the cutting edge 4, a tear-off edge 18 running parallel to the cutting edge 4 is formed. The central knife-facing surface 22 on the front surface 10 adds to the wedge-angle surface 12 to the total area of the front surface 10. The surface of the parallel region 17 and the surface of the concave region 15 together form the knife-facing surface 22. The non-stick region 19 forms part of the concave region 15, namely the wedge angle surface 12 facing.

Unmittelbar im Anschluss an die Abrisskante 18, schon in dem konkaven Bereich 15 weist das Messer 1 einen Antihaftbereich 19 mit einer durch Laserbearbeitung gravierten Struktur auf. Die gravierte Struktur besteht aus parallel verlaufenden, im Wesentlichen senkrecht zu der Abrisskante 18 angeordneten Linien 20. Die Linien 20 weisen eine über die gesamte Länge der Abrisskante 18 im Wesentlichen konstante Länge 21 von 10 mm, einen Abstand voneinander von ca. 1,5 mm, eine Breite von 0,3 mm und eine Tiefe von 0,3 mm auf. Abstand, Breite und Tiefe der Linien 20 sind in den Figuren nicht bemaßt. Die Linien 20 sind mittels Laserbearbeitung eingebracht.Immediately following the tear-off edge 18, already in the concave area 15, the knife 1 has an anti-adhesion area 19 with a structure engraved by laser processing. The engraved structure consists of lines 20 which extend parallel to one another and are substantially perpendicular to the tear-off edge 18. The lines 20 have a length 21 of 10 mm which is essentially constant over the entire length of the tear-off edge 18, a distance of approximately 1.5 mm , a width of 0.3 mm and a depth of 0.3 mm. Distance, width and depth of the lines 20 are not dimensioned in the figures. The lines 20 are introduced by means of laser processing.

In den Figuren sind

  • 1.Messer
  • 2.Einspannbereich
  • 3.Rotationsachse
  • 4.Schneidkante
  • 5.größter Radius
  • 6.kleinster Radius
  • 7.Zwischenraum
  • 8.Schnittebene
  • 9.Rückseite
  • 10. Vorderseite
  • 11.Hinterschneidung
  • 12.Keilwinkelfläche
  • 13.Breite
  • 14.Keilwinkel
  • 15.konkaver Bereich
  • 16.Breite
  • 17.paralleler Bereich
  • 18.Abrisskante
  • 19.Antihaftbereich
  • 20.Linie
  • 21.Länge
  • 22. Messeransichtsfläche
In the figures are
  • 1.Messer
  • 2.Einspannbereich
  • 3.Rotationsachse
  • 4.Schneidkante
  • 5th largest radius
  • 6.minimal radius
  • 7.Zwischenraum
  • 8.Schnittebene
  • 9.Rückseite
  • 10th front
  • 11.Hinterschneidung
  • 12.Keilwinkelfläche
  • 13.Breite
  • 14.Keilwinkel
  • 15.konkaver area
  • 16.Breite
  • 17.parallel area
  • 18.Abrisskante
  • 19.Antihaftbereich
  • 20.Linie
  • 21.Länge
  • 22. Knife view surface

Claims (17)

  1. A knife (1) for a motor-driven cutting machine for slicing foodstuffs, especially sausages, cheese, vegetables and the like, comprising a backside (9) facing the body of the foodstuff in the operation of the cutting machine and a front side (10) averted from the body of the foodstuff, at least one clamping zone (2) in which the knife (1) can be connected to a drive member of the cutting machine, and a cutting edge (4) which extends in a cutting plane (8) substantially parallel to the rear side (9) and the front side (10) and on which the rear side (9) and the front side (10) taper towards one another under an acute wedge angle (14), a wedge angle surface (12) which is adjacent to the cutting edge (4), substantially delimited from the same in a parallel manner, is ground in a smooth manner with a surface roughness depth of between 1 and 10 µm, and a visible knife surface situated on the front side (10), which surface is arranged on a side of the wedge angle surface (12) which is averted from the cutting edge (4), characterized by an anti-stick region (19) which is directly adjacent to the wedge angle surface (12), forms a portion of the visible knife surface and has a surface roughness depth of between 50 and 600 µm, preferably between 200 and 400 µm.
  2. A knife (1) according to the preceding claim, characterized in that the anti-stick region (19) is delimited substantially parallel to the cutting edge (4) and that the visible knife surface has a surface roughness depth which is lower than the surface roughness depth in the anti-stick region.
  3. A knife (1) according to one of the preceding claims, characterized in that an anti-stick region (19) is only provided on the front side (10) averted from the body of the foodstuff.
  4. A knife (1) according to one of the preceding claims, characterized in that the inclination of the wedge angle surface (12) relative to the cutting plane (8) is larger than the inclination of the anti-stick region (19) relative to the cutting plane (8).
  5. A knife (1) according to one of the preceding claims, characterized in that the boundary between wedge angle surface (12) and anti-stick region (19) is marked by a tear-off edge (18) in a surface contour of the knife (1).
  6. A knife (1) according to one of the preceding claims, characterized in that the anti-stick region (19) has an engraved or embossed structure.
  7. A knife (1) according to the preceding claim, characterized in that the structure consists substantially of parallel lines (20).
  8. A knife (1) according to the preceding claim, characterized in that the lines (20) extend approximately perpendicular to the cutting edge (4).
  9. A knife (1) according to one of the two preceding claims, characterized in that the lines (20) extend approximately perpendicular to the boundary between wedge angle surface (12) and anti-stick region (19).
  10. A knife (1) according to one of the preceding claims, characterized in that the lines (20) each have a length (21) of between 5 and 15 mm.
  11. A knife (1) according to one of the preceding claims, characterized in that the lines (20) extend at a distance of between 0.2 and 2 mm parallel with respect to each other.
  12. A knife (1) according to one of the claims 6 to 11, characterized in that the structure is introduced by means of laser machining.
  13. A knife (1) according to one of the preceding claims, characterized in that the anti-stick region (19) is arranged in a concave region (15).
  14. A knife (1) according to one of the preceding claims, characterized in that the distance between the cutting edge (4) and the boundary between wedge angle surface (12) and the anti-stick region (19) is between 0.1 and 5 mm, preferably between 0.2 and 3 mm.
  15. A knife (1) according to one of the preceding claims, characterized in that the cutting edge (4) is curved in the cutting plane (8) and that the knife (1) can be moved in a rotational way during the operation of the cutting machine about a rotational axis perpendicular to the cutting plane (8).
  16. A knife (1) according to one of the claims 1 to 14, characterized in that the cutting edge is provided with a configuration in a straight line and that the knife is clamped at opposite ends and can be moved in a translatory manner in the cutting plane during the operation of the cutting machine.
  17. A knife (1) according to one of the claims 1 to 16, characterized in that the surface in the anti-stick region (19) is formed by the material of the knife body.
EP05005663A 2004-04-03 2005-03-16 Knife for a motor driven cutting machine Active EP1582318B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004016615A DE102004016615A1 (en) 2004-04-03 2004-04-03 Knife for a motor driven cutting machine
DE102004016615 2004-04-03

Publications (2)

Publication Number Publication Date
EP1582318A1 EP1582318A1 (en) 2005-10-05
EP1582318B1 true EP1582318B1 (en) 2006-08-16

Family

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EP05005663A Active EP1582318B1 (en) 2004-04-03 2005-03-16 Knife for a motor driven cutting machine

Country Status (5)

Country Link
EP (1) EP1582318B1 (en)
AT (1) ATE336339T1 (en)
DE (2) DE102004016615A1 (en)
ES (1) ES2270396T3 (en)
HK (1) HK1085966A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018111762A1 (en) * 2018-05-16 2019-11-21 Weber Maschinenbau Gmbh Breidenbach Process for coating cutting knives
US10807266B2 (en) 2014-05-07 2020-10-20 Multivac Sepp Haggenmüller Se & Co. Kg Slicer feed unit

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202013101903U1 (en) * 2013-05-02 2013-05-17 Inauen Group Ag cutting blade
DE102019114846A1 (en) * 2019-06-03 2020-12-03 Multivac Sepp Haggenmüller Se & Co. Kg Knives, especially for slicers
DE102019134530A1 (en) 2019-12-16 2021-06-17 Tvi Entwicklung Und Produktion Gmbh Knife, a slicing machine equipped with it and a method for operating the slicing machine

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DE2911818A1 (en) * 1979-03-26 1980-10-09 Horst Groneweg Circular saw blade for bread slicing machine - has grooves for oil or wax to prevent bread sticking to blade
DE4114964A1 (en) * 1990-05-11 1991-12-12 Tokyo Silicone Co Surface profile used to prevent adhesion of substances - has base with surface of given roughness and coated in silicone polymer so that rough profile is repeated on outer surface
JPH07106747B2 (en) * 1990-05-11 1995-11-15 東京シリコーン株式会社 Adhesive storage container, cutter, steel belt for baked confectionery, transfer pipe, tire manufacturing jig, tire manufacturing machine equipment parts, antifouling body, unvulcanized rubber adhesion prevention method and sticky matter adhesion prevention method
US5988033A (en) * 1992-10-29 1999-11-23 Kraft Foods, Inc. Food slicing apparatus, blade and method
DE19612055A1 (en) * 1996-03-27 1997-10-02 Wabaema Gmbh Blade for cutting food, especially bread
DE29710489U1 (en) * 1997-06-17 1998-10-15 Rasspe Soehne P Round knife
DE29717580U1 (en) * 1997-10-02 1999-02-25 Rasspe International Gmbh & Co Round knife
US20030150306A1 (en) * 2000-05-19 2003-08-14 Adamo Sala Apparatus for the automatically cutting of elements made of elastomeric material

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10807266B2 (en) 2014-05-07 2020-10-20 Multivac Sepp Haggenmüller Se & Co. Kg Slicer feed unit
DE102018111762A1 (en) * 2018-05-16 2019-11-21 Weber Maschinenbau Gmbh Breidenbach Process for coating cutting knives

Also Published As

Publication number Publication date
HK1085966A1 (en) 2006-09-08
DE102004016615A1 (en) 2005-10-27
DE502005000058D1 (en) 2006-09-28
ES2270396T3 (en) 2007-04-01
EP1582318A1 (en) 2005-10-05
ATE336339T1 (en) 2006-09-15

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