EP3001823B1 - Dispositif et procédé d'affûtage de lames rotatives - Google Patents

Dispositif et procédé d'affûtage de lames rotatives Download PDF

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Publication number
EP3001823B1
EP3001823B1 EP14750716.4A EP14750716A EP3001823B1 EP 3001823 B1 EP3001823 B1 EP 3001823B1 EP 14750716 A EP14750716 A EP 14750716A EP 3001823 B1 EP3001823 B1 EP 3001823B1
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EP
European Patent Office
Prior art keywords
segment
segments
grinding
cutting
cutting edge
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EP14750716.4A
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German (de)
English (en)
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EP3001823A1 (fr
Inventor
Günther Weber
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Weber Maschinenbau GmbH Breidenbach
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Weber Maschinenbau GmbH Breidenbach
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Publication of EP3001823A1 publication Critical patent/EP3001823A1/fr
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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
    • B24B3/46—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades of disc blades
    • B24B3/463—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades of disc blades of slicing machine disc blades
    • 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
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/02—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent
    • B24B49/04—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent involving measurement of the workpiece at the place of grinding during grinding operation
    • 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
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/12—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving optical means

Definitions

  • the present invention relates to a device for grinding rotary knives, in particular sickle or circular knives, in particular for machines for slicing food products, such as sausage, ham, cheese or the like.
  • the slicing machine may in particular be a high-performance slicer.
  • the invention also relates to methods for grinding rotary blades.
  • Rotary knives may wear and become dull so they need to be ground.
  • Known rotary knife sharpeners use a copying plate which is a copy of the type of knife to be ground. In order to grind a rotary knife belonging to the knife type, the cutting edge present on the copying plate is traversed. This "Abfahrschul" is transmitted via a copying device to a grinding tool that moves the cutting edge of the rotary blade according to and grinds the rotary blade.
  • the disadvantage here is that - especially when several different types of knives are to be ground with a grinding device - a separate copy plate must be maintained for each type of knife. This not only costs. Rather, the time required to grind a rotary blade can be increased by the fact that for the rotary blade to be ground required copy plate must be attached to the grinder before it can be started with the grinding.
  • Another disadvantage is that a copy plate is only a "copy" of an unused rotary blade. Use-related wear and / or peculiarities on the cutting edge of the rotary blade to be ground are therefore not taken into account in the copying plate. This can lead to a non-optimal grinding result.
  • Conventional grinders may further grind only one-piece rotary knives. On the other hand, if the rotary knives are divided into segments, conventional grinding devices can not be used.
  • EP 2 532 477 A2 discloses an apparatus and method for grinding rotary blades, the apparatus having a receptacle which engages a receiving aperture of an integrally formed rotary blade for rotatably supporting it.
  • an apparatus for grinding at least one knife comprising a grinding unit with a guide member which engages a template.
  • the template is virtually executed as a data set, which is associated with the contour of the cutting edge of the knife to be ground.
  • Each knife type is assigned a barcode that can be used to automatically use the template that matches the type of knife.
  • the present invention has for its object to provide a way by which a, in particular segmented, rotary knife can be ground in an improved manner.
  • the device is designed for grinding rotary blades, which have at least two segments.
  • a rotary blade can have any number of segments, for example two, three, four, five or more segments. In particular, therefore, there is no one-piece rotary blade.
  • any arbitrarily shaped portion of the rotary blade can be considered in particular, which is separated from the rest of the knife, wherein all segments together form the rotary blade.
  • the segments of a knife may in particular have the same shape and be designed, for example, the same.
  • the rotary knife may in particular be a sickle knife with exactly one at least approximately spiral-shaped outer or cutting geometry.
  • a geometry is hereinafter also referred to in the description and in the claims for the sake of simplicity also shortened as “spiral”, i. when hereinafter in the description or in the claims of a “spiral” or a “spiral shape” is mentioned, this is generally an at least approximately spiral-shaped outer or cutting geometry to understand.
  • the spiral may also be referred to as a sickle or wing. It can thus be e.g. a conventional sickle knife with a single spiral be divided into several segments.
  • Multi-spiral sickle knives are also referred to as multi-blade sickle knives or multi-spiral knives.
  • each segment may have exactly one spiral.
  • a cutting edge can run along one or each spiral.
  • a circular knife which by definition has no spiral, is divided into several segments.
  • each segment may be shaped in particular semicircular.
  • the device according to the invention comprises at least two receptacles, to each of which a segment can be attached. There is a separate recording for each segment.
  • the segments can in particular be fastened individually.
  • the attachment may in particular comprise a fixation in the circumferential direction and / or a centering of the segments.
  • the device comprises at least one grinding tool, wherein the grinding tool and the segment mounted in the receptacle are movable relative to each other in such a way that an edge running on the circumference of the segment can be ground by the grinding tool.
  • a pivoting device may be provided for the grinding tool, wherein the pivoting device may be configured such that the grinding tool is pivotable about a pivot axis which passes through a grinding point at which the cutting edge and the grinding tool touch during the grinding process.
  • the grinding tool may comprise a grinding wheel which contacts the cutting edge at the grinding point and is pivotable about the pivot axis.
  • the pivotability of the grinding wheel to the running through the grinding point pivot axis of the grinding angle can be adjusted in a simple manner and in particular also changed during the grinding process, being designated as the grinding angle, the angle between the grinding wheel and the cutting edge. It is thus possible, for example, to set the grinding angle during the grinding process as a function of a determined or predetermined cutting profile.
  • the grinding tool may include a Abziehusion which forms at least approximately together with the grinding wheel a V-shaped receptacle for the segment and the blade touches at a Abziehddling.
  • a Abziehefficiency which forms at least approximately together with the grinding wheel a V-shaped receptacle for the segment and the blade touches at a Abziehddling.
  • burrs resulting from the grinding process can be removed from the cutting edge.
  • the Abziehin is pivotable together with the grinding wheel and / or independently of the grinding wheel about the pivot axis, so that the peel angle, which encloses the Abziehefficiency with the cutting edge, in particular changed during the grinding process and, for example, depending on the determined cutting edge can be adjusted.
  • the draw-off point also runs through the pivot axis, since then the draw-off point does not or only slightly “migrates" onto the draw-off disk when it is pivoted.
  • the segment and the grinding tool can be positioned relative to one another such that, in particular during the grinding process, the pivot axis is aligned tangentially to the cutting edge present at the respective grinding point. In this way, a particularly good grinding result is achieved.
  • the apparatus further comprises a measuring device for determining the course of the cutting edge of at least one segment and a controller, which is designed to use the determined cutting edge profile for controlling the relative movement between the grinding tool and at least one segment.
  • the measuring device can be designed to record a cutting edge or another feature of the segment that corresponds to the cutting profile and / or that allows derivation of the cutting edge profile as the cutting edge profile.
  • the cutting edge can be detected particularly easily, for example by a light barrier, which favors the determination of the cutting edge profile.
  • the feature which allows derivation of the cutting profile can be, for example, a plurality of elevations or an edge at the transition from a cutting area to a further inward area of the knife, which on one side of the knife body is the course are arranged following the cutting edge or is, so that the cutting edge profile can be derived from the detected course of the elevations or the edge.
  • a knife with such surveys is for example from the DE 10 2009 006 912 A1 known.
  • the measuring device can preferably work without contact. As a result, the measuring device can be protected against contamination and wear.
  • the measuring device may have a detection range with which only a portion of the cutting edge can be detected.
  • the position of the section can be determined relatively accurately and the cutting edge profile can be determined with sufficient accuracy from a plurality of detected positions of a plurality of cutting sections lying along the cutting edge profile.
  • a selective detection of the cutting edge can also be provided so that the cutting edge profile can be determined from a plurality of points detected in this way, for example by interpolation.
  • the measuring device and the segment can preferably be movable relative to one another in such a way that the cutting edge can be moved through the detection area of the measuring device and can be detected continuously or in sections.
  • the cutting edge profile can be detected easily and quickly in the case of selective or sectional detection of the cutting edge.
  • the measuring device can be designed to be movable. In this way it is possible, by moving the measuring device, to detect a section of the cutting edge that crosses the travel path as soon as it comes into the detection range of the measuring device.
  • the measuring device may comprise a light barrier, in particular a fork light barrier. This allows a reliable measuring device can be realized simultaneously cost.
  • the measuring device can be designed to determine the position at which the light barrier is interrupted or released by a section of the cutting edge, as a measured value for the position of this section.
  • the position of a section detected by the light barrier relative to a travel path of the light barrier can be detected. This is advantageous because the travel of the light barrier can be measured particularly easily, for example by means of an encoder which is coupled to a drive for moving the light barrier.
  • the measuring device can be designed to use the set of all positions thus detected at least as the basis for the cutting edge profile.
  • the positions can be assumed directly as a cutting profile or additional positions can be calculated, for example by interpolation, so that the cutting edge profile can be determined with high accuracy.
  • the segment can be moved and the measuring device can be designed to determine the position of the segment.
  • the measuring device can be designed to determine the position of the segment. This makes it possible to detect the positions in each case depending on the position of the segment and to determine the cutting edge profile, for example in the form of pairs of values, wherein a pair of values a detected position of a portion of the cutting edge, ie a part of the cutting edge profile, and the associated position of the Segment includes.
  • the course of the cutting edge can be determined particularly easily if the segment can be rotated about an axis of rotation provided for the cutting operation and the measuring device can be moved linearly such that for a plurality of rotational positions of the segment by means of the measuring device, the position of a portion of the cutting edge of the segment can be determined.
  • the cutting edge profile of at least one segment before the grinding process it is possible to determine the cutting edge profile of at least one segment before the grinding process.
  • the cutting profile of each segment can be determined.
  • Copy plates are therefore no longer needed.
  • segment-specific wear and / or deviations of the cutting edge profile from the "ideal" shape of a still unused knife or segment can be taken into account in this way, so that an optimal grinding result can be achieved.
  • cutting profile is also understood to mean the course of the cutting angle, which can vary along the circumference of the knife, while the cutting edge is e.g. lies on a circle.
  • the grinding device according to the invention can also be used to grind rotary knives having a plurality of segments.
  • no one-piece rotary knife is received in the receptacle.
  • a single grinding tool is provided, which grinds all segments.
  • the control is also explicitly designed to grind individual segments, for example not a rotary knife as a whole.
  • the controller must in this case be explicitly matched to the respective, in particular also differently shaped, segments.
  • the term "grinding" on the one hand to understand a first-time application of a cutting edge and on the other hand, a regrinding, such as blunted segments.
  • a regrinding such as blunted segments.
  • the invention also explicitly relates to a device and method for regrinding rotary blades or segments of rotary blades.
  • the grinding can be carried out at least partially in a position in which the segments are arranged directly next to one another.
  • the segments can be stretched flat and processed together.
  • the processing of the segments can be coordinated with each other.
  • the controller is adapted to operate on equal segments, i. in particular segments with the same cutting geometry, preferably the same cutting edge profile and / or the same cutting angle or the same cutting angle course, preferably with the same basic structure, the determined using a first segment edge profile to control the relative movement between the grinding tool and at least one other segment to use.
  • Equally executed segments can result especially in circular knives or multispiral knives.
  • a segment may, for example, be designed as a circular segment. If the circular blade comprises exactly two segments, the segments can each have a semicircular shape.
  • the segments of the same design can be designed in particular as a spiral.
  • the course of the cutting edge can in particular be stored and used, for example, for a further segment. A determination of the course of the cutting edge of another segment is thus not necessary in particular. This can save time. The grinding process can thus be made efficient.
  • a one-time determined cutting profile can be used for all segments of the same design. Preferably equal segments can thus be ground according to the same criteria.
  • a reading and / or writing device which is designed to describe data, in particular each memory device coupled to a respective segment and / or a memory device of the grinding device, preferably an RFID transponder, and / or or read the data stored on it.
  • Each segment can preferably comprise a memory device, in particular an RFID transponder or RFID chip.
  • the storage device may in particular be attached to a side surface of the segment.
  • the grinding device itself may also comprise a storage device.
  • any storage media such as chips, memory cards, flash memory, USB sticks or SSD storage are possible.
  • the data information can also be contained in barcodes or QR codes, which can be applied in particular to the segments.
  • the data may in particular include the course of the respective cutting edge or data dependent on this course.
  • the course of the cutting edge of the first segment can be saved.
  • the data may, for example, represent the control data for the grinding tool.
  • the data may include cutting parameters, for example the cutting edge angle.
  • the information may be included in the data, as often a corresponding segment or a rotary knife has already been ground. Also, for example, balance data of the respective segments can be stored.
  • the data determined on the basis of the first segment which relate to the cutting profile of the first segment, can be transmitted to the storage device of the grinding device and / or to the storage device of at least one further segment.
  • cutting profiles can be stored on segments whose cutting edge profile itself has not been determined.
  • a separate receptacle is provided for each segment, the receptacles and / or the segments held in the receptacles being spaced apart from each other during the grinding process.
  • Such a discharge area can be omitted in a separate processing of the segments, since the segments can be ground independently. Thus, cutting ranges of 360 ° are possible. Depending on the geometry of the segments, the cutting area can also be greater than 360 °.
  • the segments can be ground in particular spatially separated from each other.
  • the segments received in a grinding device may be spaced apart from each other.
  • segments of the same design which are ground in a spaced-apart position, can be ground on the basis of data determined only on one segment.
  • the recordings can in particular be permanently separated from each other locally.
  • the receptacles are assigned to each other and / or relative to each other adjustable.
  • the receptacles may preferably initially lie directly next to each other, so that the individual segments can be mounted together. Subsequently, if necessary, a Cutting edge course are determined. The recordings can then be moved apart. Here it is possible to adjust all recordings. Alternatively, a recording remain stationary while at least one further recording is adjusted. The movement of a recording can take place both in the plane of the rotary blade and vertically thereto, ie in the axial direction. The movements and distances are selected according to the measuring and grinding tools.
  • the cutting edge profile of at least one of the segments can be determined. The determination of the cutting profile does not have to be done before adjusting the recordings.
  • the grinding itself is preferably carried out in a position in which the receptacles are spaced apart.
  • the grinding can also take place in a position in which the receptacles and thus the segments are arranged directly next to each other in order to match the segments to one another.
  • the recordings can be adjusted to each other again.
  • the individual segments can then be removed again in particular together.
  • the invention also relates to a method for grinding rotary knives, in particular sickle or circular knives, in particular for a machine for slicing food products, for example sausage, ham, cheese or the like.
  • the device for slicing food products may in particular be a high-performance slicer.
  • rotary knives are ground, which have at least two segments.
  • a grinding device according to the invention can be used.
  • the course of a cutting edge of at least one segment is determined and at least one segment is then ground during a relative movement between the segment and a grinding tool.
  • the relative movement between the segment and the grinding tool is controlled on the basis of the determined cutting profile.
  • the segments can in this case, in particular jointly, be placed on a common receptacle. Also, the segments can be put together on different shots. Preferably, the segments are hereby clamped plane.
  • the segments may be timed, e.g. by means of a handling device, are mounted on the grinding device.
  • a handling device may be used which comprises a plurality of sections.
  • the segments can therefore be ground consecutively in time.
  • the segments are held on different receptacles, wherein the receptacles are adjusted relative to each other to provide a distance between the segments during the course of the cutting process and / or during grinding.
  • the segments can be placed here successively or simultaneously on the different shots. Subsequently, for example, the cutting edge profile, in particular of all segments can be determined. If the segments are the same, only the edge profile of a segment can be determined.
  • the shots can be adjusted relative to each other.
  • the recordings are moved apart, wherein all recordings or only one of the recordings can be adjusted relative to the other recording.
  • an electric drive is provided in particular.
  • the adjustment can in principle also be done manually or pneumatically.
  • both variable, preferably predetermined by the controller, positions and - alternatively - fixed positions are conceivable, for example, a clamping position and a machining position.
  • the determination of the cutting edge profile can also take place only when the segments are separated from each other.
  • a determination of the cutting edge profile can also be dispensed with altogether, if identical segments are used, of which the cutting profile is already known and stored, for example, in a memory device, in particular of the segments.
  • the segments can be ground. In this way, even with sickle blades cutting areas of 360 ° and greater can be achieved, since no outlet area is necessary, such as in one-piece sickle blades.
  • the shots can be adjusted to each other again.
  • one of the receptacles can be stationary while at least one other receptacle is being moved. If the segments are again arranged next to one another, they can be removed from the receptacles by means of a handling device.
  • the segments can also be removed when the segments are spaced apart.
  • It may be a handling device for attaching a rotary knife comprising at least two segments, in particular a sickle or circular blade, provided on a blade holder, preferably on a device for grinding rotary blades or a device for cutting food products with at least two sections, wherein each section for Receiving a segment is formed.
  • Such a handling device may also be referred to as a knife guard and, in particular, in addition to the holding function, also fulfill a number of other functions.
  • the number of sections may correspond to the number of segments.
  • the individual segments can be transported independently.
  • the weight to be transported can be considerably reduced because the knife does not have to be moved as a whole.
  • the assembly and disassembly of the individual segments on the blade holder by means of the respective sections of the handling device independently respectively. So must also be held during assembly or disassembly preferably only one segment.
  • the handling is significantly improved according to the invention, since not the entire knife has to be mounted, dismantled or transported all at once.
  • the individual segments may be e.g. be placed on a grinding device at any position, in particular on spaced apart blade receptacles, separated from each other.
  • the individual segments can also be removed independently of one another.
  • the cutting edges of the respective segments can be received in the sections.
  • the sections can thus serve in particular as a blade guard.
  • Each section can be adapted to the contour and / or size of the respective segment.
  • the sections can be shaped as circular segments.
  • at least a portion may have a crescent-shaped structure.
  • the cuts can be made the same.
  • a portion greater than at least another portion may be formed. This is particularly the case when a sickle knife with only one spiral is divided into two segments.
  • the section which accommodates the spiral can in this case in particular be larger than the section which accommodates the segment which contains no spiral.
  • the sections may in this case be designed in particular as semicircles with mutually different radii.
  • the sections can be detachably connected to one another, in particular by means of a screw, latch, slide and / or clamping device.
  • a screw, latch, slide and / or clamping device In principle, any composite devices are possible.
  • the sections can thus be bolted together, for example. Also a bayonet closure is e.g. possible. Furthermore, a magnetic connection of the sections may be provided.
  • the sections can be connected to each other without tools and / or separated again.
  • the sections can be connected to each other in particular for storage. A clear assignment of the recorded segments in the segments is ensured.
  • the segments can preferably be reused in this way in pairs.
  • the assembly or disassembly can be done by the detachable connection in particular together or individually.
  • the sections can be connected or connected to each other in a position in which they are arranged, in particular flush, adjacent in a plane.
  • the sections can be connected or connected to one another in a position in which they are arranged at least partially overlapping.
  • the individual sections may in particular be located one above the other in different planes.
  • the sections may be arranged completely overlapping.
  • An overlapping arrangement allows in particular a space-saving storage.
  • the same segments are ground successively.
  • the segments can be placed successively or together on a recording or on different recordings.
  • a cutting profile of a first segment is determined on the basis of a first segment. This cutting profile is used to control the relative movement between the grinding train and at least one other segment.
  • a further segment can be ground on the basis of the data determined by the first segment.
  • the further segment can in this case be placed on the same receptacle, in particular after removal of the first segment. It is also possible that the further segment is placed on a separate receptacle and ground there. In particular, the segments may be spaced from each other here.
  • the cutting process can be optimized. In particular, this time can be saved because a renewed measurement of a preferably at least substantially identical edge profile is eliminated.
  • differently shaped segments can each be ground with different grinding parameters.
  • the differently shaped segments can also have an identical base structure.
  • the difference between the segments results from the different grinding parameters.
  • the different segments can be placed one after the other or together on one or on different shots.
  • a separate edge profile can be determined for each segment.
  • the cutting profile can also be removed, for example, from a storage device.
  • the cutting parameters may in particular include the cutting edge angle and / or the course of the cutting edge.
  • the cutting angle is the angle between a cutting plane perpendicular to the axis of rotation of the knife and a plane tangent to the cutting surface through any point on the cutting edge.
  • the cutting angle determines, on the one hand, the influence on the product to be sliced and, on the other hand, the manner of depositing the respectively separated product slice by the rotary knife.
  • the size of the cutting angle is chosen depending on the product and application specific conditions.
  • the edge angle constant along the cutting edge always represents a compromise with regard to the products to be sliced.
  • a too large cutting angle, ie an edge surface that is too steep, should be avoided as far as possible This would put too much pressure on the product and thus expose the product to unacceptable compression.
  • a small cutting angle, ie a relatively flat cutting surface results in gentle, gentle cuts that do not unnecessarily compress the product.
  • the desired in most cases storage behavior with respect to each separated product slices can not be "wedged" in the desired manner.
  • the differently shaped segments are ground in such a way that they each have a circumferentially varying, in particular continuously increasing or decreasing cutting angle.
  • the cutting angle as a whole i. the cutting angle of the rotary blade, steadily increase.
  • the cutting edge angle of the individual segments is selectively varied to a relevant extent along the cutting edge, which has noticeable effects in the cutting operation, in particular on the extent of the product upsets caused by the rotary knife and on the manner of product placement effected by the knife.
  • the size of the cutting edge angle can be adapted to the course of the cutting process.
  • the cutting edge angle can be chosen depending on which This cooperating peripheral region during the cutting process with the respective product.
  • the setting options are no limits.
  • the rotary blades can be optimized individually due to the variability of the cutting edge angle according to the invention.
  • the pivoting device for the grinding tool on at least one pivot bearing whose axis of rotation coincides with the pivot axis of the grinding tool.
  • the grinding device can be pivoted in a simple manner by means of the pivot bearing during grinding and the grinding angle between the grinding wheel and the cutting edge can be optimally adapted. This is particularly advantageous in rotary knives whose cutting edge has a variable cutting angle.
  • a one-piece knife with variable cutting angle is for example from the EP 2 162 266 B1 known.
  • the provision of a pivot bearing, the one with the Has pivot axis coincident axis of rotation, has the advantage that the grinding tool by a rotational axis occurring about the rotational movement extremely precise and correspondingsunan réelle pivoted around the grinding point and thus the grinding angle can be adjusted during the grinding process in a simple manner.
  • the cutting edges of the segments are ground in such a way that they are adapted to one another.
  • a cutting edge of the rotary blade with a continuously increasing or decreasing cutting edge angle preferably results.
  • the cutting edges of the segments can be adapted to each other such that the largest cutting angle of a segment is less than or equal to the smallest cutting angle of the adjacent segment.
  • the rotary blade has a designated direction of rotation, wherein the cutting angle increases counter to the direction of rotation over all the edges of the segments.
  • the cutting angle increases, i. the cutting edge on the outside of the blade, which is radially outwardly bounded by the cutting edge, becomes progressively steeper during the cutting process.
  • the cutting angle can increase with increasing radial distance of the cutting edge of the rotation axis.
  • the cutting edge may have an immersion region, with which the rotary blade, when used as intended, is immersed in a product to be sliced during the cutting operation, wherein the cutting angle is smallest in the immersion region.
  • the change of the cutting angle can be done without the formation of steps in the cutting surface.
  • the cutting angle may e.g. in a range of about 15 ° to 30 °, preferably about 20 ° to 30 ° vary.
  • the cutting surface may have a width that varies depending on the size of the cutting angle.
  • the width may e.g. vary in a range of about 0.5 mm to 1.5 mm.
  • the cutting edge of the rotary blade can extend overall over an angle which is between 180 ° and 360 °. Even angles greater than 360 ° are possible with a corresponding design of the spiral.
  • the differently shaped segments are ground such that they each have a mutually different, at least substantially constant cutting angle.
  • one segment may have a cutting angle of about 15 °, while another segment may have a cutting angle of about 20 °.
  • the grinding process can be realized in a simple manner. So the grinding angle does not have to be changed permanently.
  • the cutting angle of the individual segments can be adapted to the respective cutting phase.
  • the angle may, for example, be constant over a range of 80%, 90% or 95% of the total cutting edge of the respective segment.
  • a deviating, variable angle can be provided in this case.
  • a smooth transition between the segments is ground with different cutting angles.
  • the different cutting angle can be adapted in the region of the transition in particular at least substantially to each other.
  • both adjacent segments can be matched to each other.
  • the grinding of the segments takes place together.
  • the, in particular differently formed, segments each comprise an RFID transponder, via which the segments of a rotary blade are assigned to one another.
  • the respective segments may exhibit similar signs of wear, for which reason it may be advantageous for the respective segments of a rotary blade to always be ground in the same or at least similar intervals or always be used together during cutting operations.
  • any information carriers are conceivable instead of an RFID transponder.
  • the individual segments can also be assigned to each other in color.
  • An assignment by means of barcodes or QR codes is basically possible.
  • the present disclosure also relates to a non-inventive method for grinding a sickle blade with at least two equal spirals.
  • at least two, three, four, five or more identical spirals may be provided.
  • the sickle blade is hereby integrally formed, i. not divided into individual segments.
  • the sickle knife can be used in particular for a machine for slicing food products, such as sausage, ham, cheese or the like. This may in particular be a high-performance slicer.
  • a device for grinding is used.
  • the course of a cutting edge of at least one spiral is determined by means of a measuring device and then at least one spiral is subsequently ground during a relative movement between the spiral and a grinding tool.
  • the relative movement between the spiral and the grinding tool is controlled on the basis of the determined cutting profile. Equal spirals are successively ground on the basis of the cutting profile of a first spiral.
  • first the cutting profile of the first spiral is determined. After that, in particular, the first spiral can be ground. Spirals, which are made equal to the first spiral, can then be ground on the basis of the data of the first spiral.
  • one respective cutting profile can be determined by the different spirals, which can be used to grind the respectively identically designed spirals.
  • all the spirals of a sickle blade are made equal.
  • edge profile determined by means of the first spiral can be used to control the relative movement between the grinding tool and at least one further spiral.
  • rotary knives are ground with at least two spirals, one, in particular each, coupled to a respective spiral or a respective segment memory device and / or a memory device of the grinding device, preferably an RFID transponder, with data described.
  • the data stored thereon can be read out.
  • each spiral or each segment may comprise a memory device, in particular an RFID transponder or RFID chip.
  • the storage device may in particular be attached to a side surface of the spiral or of the segment.
  • any storage media such as e.g. Chips, memory cards, flash memory, USB sticks or SSD memory possible.
  • the data information can also be contained in barcodes or QR codes, which can be applied in particular to the spirals or the segments.
  • the data may include the course of the respective cutting edge or data dependent on this course, in particular cutting edge angles and / or cutting profiles.
  • the course of the cutting edge of the first spiral or of the first segment can be stored.
  • the data may, for example, represent the control data for the grinding tool.
  • the data may also include cutting parameters, such as cutting angle.
  • the information can be included in the data, how often one corresponding spiral or a corresponding segment has already been ground. Also, for example, balance data of the respective spirals or segments can be stored.
  • the data determined on the basis of the first spiral or of the first segment, which relate to the cutting profile of the first spiral or of the first segment can be transmitted to the storage device of the grinding device and / or to the storage device of at least one further spiral or a further segment ,
  • each spiral or each segment may have its own memory device, preferably an RFID transponder or a chip.
  • information which in particular contains the cutting parameters can thus be stored on each spiral or each segment.
  • the cutting profile of a spiral or a segment is first determined.
  • the spiral or the segment is then ground in particular.
  • the determined data can then, at least in the meantime, be stored on the storage device of the spiral or of the segment and / or in the storage device of the grinding device.
  • another segment can be spanned one after the other or together with the first segment and ground on the basis of the data contained in the memory device of the first segment or the memory device of the grinding device, which serve as default values.
  • the data can then be transferred, in particular from the storage device of the grinding device, to the storage device of at least one further spiral or at least one further segment.
  • spirals or segments can contain information about the cutting edge, which were not measured themselves.
  • the grinding of the respective spirals or segments is coordinated with each other.
  • the grinding is particularly coordinated, i. not independent of each other.
  • the grinding may include a plurality of processing steps, in particular pre-grinding, grinding and / or regrinding.
  • a processing step is performed on a first spiral or a first segment and then on at least one further spiral or a further segment.
  • a further processing step is performed only after completion of a processing step.
  • first a first spiral or a first segment can be pre-ground.
  • a second spiral or a second segment can be pre-ground.
  • a first spiral or a first segment can be ground.
  • the grinding of the second spiral or of the second segment can take place.
  • a regrinding of the first spiral or the first segment can take place.
  • regrinding of the second spiral or of the second segment can take place.
  • grinding device 1 for grinding rotary blades 3 comprising several segments 2.
  • Such rotary blades 3 are used, for example, in high-speed cutting machines for slicing food products, which are also referred to as slicers.
  • a receptacle 5 is provided, on which a receiving opening 7 of the segment 2 is placed and on which the segment 2 is fastened (cf. Fig. 2 ).
  • the grinding device 1 has a grinding tool 9.
  • the segment 2 and the grinding tool 9 are movable relative to one another so that a cutting edge 11 running on the circumference of the segment 2 can be ground by the grinding tool 9.
  • an automatic determination of the profile of the cutting edge 11 by a measuring device 13 which is coupled to a controller 15, so that the determined cutting profile of the controller 15 can be provided.
  • the controller 15 is in turn coupled to the grinding tool 9 and a drive (not shown) for the receptacle 5. By the drive, the receptacle 5 and the attached segment 2 can be rotated in a direction of rotation I and the controller 15 is adapted to use the determined cutting edge for controlling the relative movement between the grinding tool 9 and the segment 2.
  • the measuring device 13 To detect the course of the cutting edge 11, the measuring device 13 has a forked light barrier 17, which is coupled to a linear motor (not shown) and arranged so that the forked light barrier 17 is located radially outside the cutting edge 11. By the linear motor, the fork light barrier 17 along a travel path II (see., The double arrow in Fig. 1 ) so that the forked light barrier 17 is moved toward or away from the segment 2.
  • a linear motor not shown
  • the fork light barrier 17 has a detection range within which a light path between a transmitter and a receiver (both not shown) of the fork light barrier 17 extends. If the fork light barrier 17 is moved radially outwards onto the segment 2, the light path is interrupted by a section of a radially outer cutting edge 23 crossing the travel path II as soon as the section reaches the detection area. At opposite If the section leaves the detection area again, the light path is released again.
  • the segment 2 is rotated in the direction of rotation I, so that for a plurality of rotational positions of the segment 2 of the respective the path II of the forked light barrier 17 crossing portion of the cutting edge 23 can be detected.
  • the respective position of the light barrier 17 relative to the travel path II for example by means of an encoder coupled to the linear motor (FIG. 2), is measured as the measured value for the position of a detected section. not shown), determined by the measuring device 13.
  • the measuring device 13 is designed to determine the respective position of the segment 2, based on the direction of rotation I, in which the respective section is detected.
  • the measuring device 13 is coupled to a position sensor, not shown, which is designed and arranged to detect the position of the segment 2, for example. As a rotation angle relative to a zero point.
  • the measuring device 13 therefore determines a multiplicity of value pairs in the described embodiment.
  • a pair of values comprises the position of the respective section II of the cutting edge 23 crossing the travel path II, as well as the associated rotational position of the segment 2, determined in relation to the travel path II.
  • the pairs of values determined in this way can be assumed directly as the cutting edge profile.
  • the measured value which indicates the position of a section relative to the travel path II, can be converted into a distance value which indicates the distance between the respective section and the center of the receptacle 5 or the receiving opening 7.
  • the course of the cutting edge 23 in polar coordinates with the center of the receptacle 5 or the receiving opening 7 can be determined as the origin.
  • further value pairs can be calculated by interpolation.
  • the measuring device could be designed, for example, such that an edge 51 of the segment 2 extending in accordance with the cutting edge 11 is detected. It is also conceivable in principle to determine the cutting edge profile by means of a camera and by image evaluation. A relative movement between segment 2 and measuring device 13 is therefore not mandatory for the determination of the cutting edge profile.
  • the thus determined edge profile is transmitted by the measuring device 13 to the controller 15 and stored there at least temporarily in a memory 25. Also, the edge profile on an RFID transponder 26 of the segment 2 can preferably be stored permanently.
  • a cutting path already stored on the RFID transponder 26 or the memory 25 can be read out and used for grinding.
  • the forked light barrier 17 is moved away from the segment 2.
  • the cutting edge 11 is processed in a conventional manner by a grinding and Abziehfit 29, 31 of the grinding tool 9.
  • the blade 11 is touched by the grinding wheel 29 in a grinding point and the Abziehitch 31 in a Abziehyak ,
  • the grinding tool 9 can be positioned relative to the segment 2 in such a way that, in particular during the entire grinding process, a pivot axis is aligned tangentially to the cutting edge 23 passing through the respective grinding point.
  • the segment 2 is rotated in the direction of rotation I and thus moved past the grinding tool 9.
  • the controller 15 is - as mentioned - adapted to the relative movement between the segment 2 and the grinding tool 9 to control so that the cutting edge 11 is "driven off" by the grinding tool 9 according to the determined cutting edge.
  • the grinding tool 9 can be moved by means of a linear motor 55 along a travel path to keep the grinding point and the Abzieh Vietnamese in contact with the cutting edge 11, while the segment 2 is moved past the grinding tool 9.
  • the grinding tool 9 is thus traced in order to compensate for the changing radius of the segment 2.
  • a segment 2 can be placed on the receptacle 5.
  • the measuring device 13 can then determine the course of the cutting edge 11. This history can be stored in the memory 25.
  • the controller 15 the cutting edge 11 can now be ground with the grinding tool 9.
  • the segment 2 After completion of the grinding process, the segment 2 can be removed. Thereupon, a segment 2 of the same design can be placed on the receptacle 5. Since the course of the cutting edge 11 corresponds to the course of the previous segment, the data contained in the memory 25 can be used to control the grinding tool 9. A renewed measurement of the cutting profile can thus be omitted. The course of the cutting edge 11 can be stored on the RFID transponder 26 of the segment 2.
  • a rotary blade 3 with a spiral 57 is shown.
  • one-piece rotary blades 3 was previously an outlet 59 is necessary. Because the rotary blade 3 is divided into the segments 2, such an outlet 59 is no longer necessary. Thus, cutting edges 11 can be produced which have a greater circumferential length. Dashed is in Fig. 2 this one Cutting range of 360 ° shown. Dotted is a cutting area of greater than 360 ° shown.
  • the individual segments 2 can thus successively on the receptacle 5 of the grinding device 1 according to Fig. 1 be put on.
  • An outlet 59 is unnecessary here.
  • Each segment 2 can have an RFID transponder 26, to which various data, for example a cutting profile, a cutting angle, the number of grinding passes already made or data with which the segments 2 can be assigned to one another, are stored.
  • Each segment 2 also comprises recesses 61. These can serve, for example, for mounting and / or centering on a blade receptacle, in particular a slicing device, or on a handling device. Also, for example, a counterweight 61 may be attached to the recesses 61.
  • a rotary blade 3 with two spirals 57 is shown.
  • the rotary blade 3 is in this case integrally formed, that is not divided into segments.
  • a rotary blade 3 can with a grinding device according to Fig. 1 be sanded.
  • the rotary blade 3 can in this case be placed on the receptacle 5 via the receiving opening 7. Subsequently, for example, the course of a cutting edge 11 of one of the spirals 57 can be determined. This course can be stored, for example, on the RFID transponder 26.
  • both spirals 57 can now be ground. A separate determination of the cutting edge profile for both identically formed spirals 57 is thus not necessary.
  • a rotary blade 3 is shown, which is divided into two segments 2.
  • the segments 2 are placed on different receptacles 5.
  • the segments 2 can, for example, together with a grinding device 1 according to Fig. 1 be sanded, which includes two receptacles 5 accordingly.
  • the receptacles 5 are already spaced from each other by design.
  • the receptacles 5 are initially arranged next to one another. In this position, the segments 2 can be placed. Subsequently, the receptacles 5 can be adjusted relative to each other along an adjustment path III shown as a double arrow, so that the segments 2 are spaced from each other. In this spaced position no outlet 59 is necessary. Thus, cutting areas of 360 ° can be achieved.
  • a handling device 63 with two sections 65 is shown.
  • the sections 65 are for receiving segments 2 of a knife 3 according to Fig. 4 educated.
  • the contour of the individual sections 65 is in each case adapted to the contour of the individual segments 2 of the blade 3.
  • the sections 65 have different radii.
  • Each section comprises a cutting receptacle 67, in which the cutting edges 11 of the segments 2 can be accommodated. Furthermore, each section 65 comprises two handles 69 and screws 71.
  • the sections 65 can be placed individually on the segments 2 for disassembly of a knife 3. By means of the screws 71, which can engage in recesses 61 of the segments 2, the segments 2 can be attached to the respective sections 65. The segments 2 are then released from the receptacle 5 and can with the help of pieces 65 on the handles 69th be removed and transported.
  • the sections 65 may be interconnected by means of a composite device 73, such as a detent, screw, clamp and / or slide device. The sections 65 can thus be connected in particular releasably to each other.
  • a rotary blade 3 with three segments 2 is shown. Dashed is a cutting area of 360 ° and dotted by greater than 360 ° shown.
  • the individual segments 2 can be ground sequentially or together.
  • the grinding can e.g. be made such that the cutting edges 11 of the respective segments 2 have different cutting angle.
  • the cutting edges 11 may have a steadily increasing cutting angle, for example.
  • each of the segments 11 has a constant cutting angle.
  • the segment 11 shown on the left side may have a cutting angle of 15 °, the middle segment 11 a cutting angle of 20 ° and the segment 11 shown on the right a cutting angle of 25 °.
  • the cutting angle can be adapted to each other here, so that a smooth transition is ensured.
  • the cutting edge 11 of at least one segment 2 can in this case be adapted to the cutting edge 75 of the cutting edge 11 of the adjacent segment 2. This is based on the dashed line in Fig. 7 shown in which a cross section of a segment 2 is shown.
  • the cutting edge 11 can thus have a cutting angle different from the remaining cutting edge 11 of the segment 2.
  • the cutting angle of the blades 2 of the rotary blade 3 according to Fig. 2 can be variable, especially steadily increasing, be designed. Also mutually different cutting angle of the individual segments 2, for example 15 ° and 20 °, are possible in this case.
  • the transition region 75 can be smoothed.
  • Segmented rotary blades in particular with variable cutting angles and / or large peripheral lengths, can therefore also be ground in accordance with the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Claims (14)

  1. Dispositif d'affûtage de lames rotatives (3) qui comprennent au moins deux segments (2), en particulier des lames en forme de faucille ou des lames circulaires, en particulier pour une machine destinée à découper des produits alimentaires, comportant
    - au moins deux logements (5) sur lesquels peut être monté respectivement un segment (2),
    - au moins un outil d'affûtage (9), l'outil d'affûtage (9) et le segment (2) monté dans le logement respectif (5) étant mobiles l'un par rapport à l'autre de telle sorte qu'un tranchant (11) s'étendant à la périphérie du segment (2) peut être affûté par l'outil d'affûtage (9),
    - un moyen de mesure (13) pour déterminer le tracé du tranchant (11) d'au moins un segment (2), et
    - une commande (15) qui est réalisée pour utiliser le tracé de tranchant déterminé pour commander le mouvement relatif entre l'outil d'affûtage (9) et au moins un segment (2) ;
    - dans lequel un logement séparé (5) est prévu pour chaque segment (2), les logements (5) et/ou les segments (2) retenus dans les logements (5) étant espacés l'un de l'autre pendant l'affûtage.
  2. Dispositif selon la revendication 1,
    caractérisé en ce que
    les segments (2) étant réalisés identiques, la commande (15) est réalisée pour utiliser au moins partiellement le tracé de tranchant, déterminé en se basant sur un premier segment (2), pour commander le mouvement relatif entre l'outil d'affûtage (9) et au moins un autre segment (2).
  3. Dispositif selon la revendication 1 ou 2,
    caractérisé en ce que
    il est prévu un moyen de lecture et/ou d'inscription qui est réalisé pour inscrire des données dans un, en particulier dans chaque moyen de mémorisation (26) couplé au segment respectif (2), et/ou pour lire les données qui y sont mémorisées.
  4. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    il est prévu un moyen de lecture et/ou d'inscription qui est réalisé pour inscrire des données dans un moyen de mémorisation du dispositif d'affûtage (25) et/ou pour lire les données qui y sont mémorisées.
  5. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    les logements (5) sont associés les uns aux autres et/ou mobiles les uns par rapport aux autres.
  6. Procédé d'affûtage de lames rotatives (3) qui comprennent au moins deux segments (2), en particulier des lames en forme de faucille ou des lames circulaires, en particulier pour une machine destinée à découper des produits alimentaires, comportant un dispositif (1) selon l'une des revendications précédentes, dans lequel
    on détermine le tracé d'un tranchant (11) au moins d'un segment (2) et on affûte ensuite au moins un segment (2) pendant un mouvement relatif entre le segment (2) et un outil d'affûtage (9), le mouvement relatif entre le segment (2) et l'outil d'affûtage (9) étant commandé en se basant sur le tracé déterminé du tranchant ;
    dans lequel les segments (2) sont retenus dans différents logements (5) qui sont déplacés les uns par rapport aux autres afin de créer une distance entre les segments (2) pendant la détermination du tracé du tranchant et/ou pendant l'affûtage.
  7. Procédé selon la revendication 6,
    caractérisé en ce que
    on affûte successivement des segments (2) réalisés identiques, et on utilise au moins partiellement le tracé de tranchant déterminé en se basant sur un premier segment (2) pour commander le mouvement relatif entre l'outil d'affûtage (9) et au moins un autre segment (2).
  8. Procédé selon la revendication 6,
    caractérisé en ce que
    on affûte des segments (2) réalisés différemment avec des paramètres d'affûtage respectifs différents.
  9. Procédé selon la revendication 8,
    caractérisé en ce que
    on affûte les segments (2) réalisés différemment de telle sorte qu'ils présentent chacun un angle de tranchant qui varie, en particulier qui augmente ou diminue constamment, en direction périphérique.
  10. Procédé selon la revendication 8,
    caractérisé en ce que
    on affûte les segments (2) réalisés différemment de telle sorte qu'ils présentent des angles de tranchant qui se distinguent entre eux et qui sont au moins sensiblement constants à l'intérieur d'un segment (2), et en particulier l'angle de tranchant dans la zone de transition entre les segments (2) se distingue des angles de tranchant dans d'autres zones des segments (2), en affûtant une transition douce entre les segments (2).
  11. Procédé selon l'une des revendications 6 à 10,
    caractérisé en ce que
    les segments (2) comprennent chacun un transpondeur RFID (26), par lesquels les segments (2) d'une lame rotative (3) sont associés les uns aux autres.
  12. Procédé selon l'une des revendications 6 à 11,
    caractérisé en ce que
    on inscrit des données dans un, en particulier dans chaque moyen de mémorisation (26) couplé à une spirale respective (57) / à un segment respectif, et/ou on lit les données qui y sont mémorisées.
  13. Procédé selon l'une des revendications 6 à 12,
    caractérisé en ce que
    on inscrit des données dans un moyen de mémorisation (25) du dispositif d'affûtage et/ou on lit les données qui y sont mémorisées.
  14. Procédé selon l'une des revendications 6 à 13,
    caractérisé en ce que
    l'affûtage comprend plusieurs étapes de traitement, en particulier un pré-affûtage, un affûtage et/ou un post-affûtage, et on réalise une étape de traitement tout d'abord sur une première spirale (57) ou sur un premier segment (2) et ensuite sur au moins une autre spirale (57) ou sur un autre segment (2), et on réalise une autre étape de traitement en particulier uniquement après avoir terminé une étape de traitement.
EP14750716.4A 2013-08-28 2014-08-08 Dispositif et procédé d'affûtage de lames rotatives Active EP3001823B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013217137.4A DE102013217137A1 (de) 2013-08-28 2013-08-28 Vorrichtung und Verfahren zum Schleifen von Rotationsmessern
PCT/EP2014/067080 WO2015028285A1 (fr) 2013-08-28 2014-08-08 Dispositif et procédé d'affûtage de lames rotatives

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EP3001823A1 EP3001823A1 (fr) 2016-04-06
EP3001823B1 true EP3001823B1 (fr) 2017-12-13

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DE (1) DE102013217137A1 (fr)
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DE102015225667A1 (de) * 2015-12-17 2017-06-22 Volkswagen Aktiengesellschaft Verfahren zur Bearbeitung eines Werkstückes mit einem Handhabungssystem
WO2017108590A1 (fr) * 2015-12-21 2017-06-29 Gea Food Solutions Germany Gmbh Dispositif et procédé pour affûter une lame
DE102016108346A1 (de) * 2016-05-04 2017-11-09 Weber Maschinenbau Gmbh Breidenbach Vorrichtung und verfahren zum aufschneiden von lebensmittelprodukten
BR102016020293A2 (pt) * 2016-09-01 2018-03-20 Mundial S.A. Produtos De Consumo Sistema e método para monitoramento de utensílios em frigoríficos, e utensílio
DE102020103045A1 (de) 2020-02-06 2021-08-12 Multivac Sepp Haggenmüller Se & Co. Kg Messer sowie damit ausgestattete Aufschneide-Maschine
DE102022112000A1 (de) * 2022-05-12 2023-11-16 Dipl.Ing. S c h i n d l e r & Wagner GmbH & Co KG Vorrichtung zum Schäfen und Verfahren zum Betrieb der Vorrichtung

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DE102004059479B4 (de) * 2004-05-13 2006-04-06 Astor Schneidwerkzeuge Gmbh Rotationsmesser
JP5016496B2 (ja) * 2004-12-17 2012-09-05 ミルウォーキー・エレクトリック・トゥール・コーポレーション 動力工具用スマートアクセサリー
DE102007040350A1 (de) 2007-08-27 2009-03-05 Weber Maschinenbau Gmbh Breidenbach Schneidmesser
DE102009006912A1 (de) 2009-01-30 2010-08-05 Weber Maschinenbau Gmbh Breidenbach Schneidmesser
DE102011103418A1 (de) * 2011-06-06 2012-12-06 Weber Maschinenbau Gmbh Breidenbach Vorrichtung und Verfahren zum Schleifen von Rotationsmessern
DE102012005566A1 (de) * 2012-03-20 2013-09-26 Weber Maschinenbau Gmbh Breidenbach Vorrichtung und Verfahren zum Schleifen von Rotationsmessern
EP2532477B1 (fr) * 2011-06-06 2019-04-24 Weber Maschinenbau GmbH Breidenbach Dispositif et procédé de ponçage de lames rotatives
DE102013007275A1 (de) * 2013-04-26 2014-11-13 Weber Maschinenbau Gmbh Breidenbach Lebensmittelaufschneidemesser mit einem Funktransponder
DE202013005156U1 (de) * 2013-06-07 2013-08-23 Alfred Siemer Vorrichtung zum Schleifen wenigstens eines Messers

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EP3001823A1 (fr) 2016-04-06
WO2015028285A1 (fr) 2015-03-05

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