EP3142830B1 - Sharpening device having abrasive belts arranged crosswise - Google Patents

Sharpening device having abrasive belts arranged crosswise Download PDF

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Publication number
EP3142830B1
EP3142830B1 EP15732303.1A EP15732303A EP3142830B1 EP 3142830 B1 EP3142830 B1 EP 3142830B1 EP 15732303 A EP15732303 A EP 15732303A EP 3142830 B1 EP3142830 B1 EP 3142830B1
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EP
European Patent Office
Prior art keywords
sharpening
belts
dihedron
abrasive
pressing roller
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EP15732303.1A
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German (de)
French (fr)
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EP3142830A1 (en
EP3142830C0 (en
Inventor
Jean-Pierre Bodard
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Bobet Materiel
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Bobet Materiel
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Publication of EP3142830B1 publication Critical patent/EP3142830B1/en
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    • 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
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/18—Accessories
    • B24B21/20—Accessories for controlling or adjusting the tracking or the tension of the grinding belt
    • 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
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/006—Machines or devices using grinding or polishing belts; Accessories therefor for special purposes, e.g. for television tubes, car bumpers
    • 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
    • B24B3/54—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades of hand or table knives

Definitions

  • the present invention relates to the general field of devices for sharpening the blades of cutting tools such as knives or the like.
  • a sharpening device comprising at least two movable abrasive belts each provided with an active abrasive top surface and a bottom surface, which belts are offset longitudinally and arranged in a cross to form a crossing line defining, on one side, a sharpening dihedral formed by said moving top surfaces of said bands, and on the other side, an underlying dihedral, formed by said moving bottom surfaces of said bands. And it also relates to a sharpening process using such a device.
  • the sharpening of a blade can be carried out by an operator, on a stone, belt, or other grinding wheel.
  • the operation requires experience and good dexterity to obtain the desired cutting profile, generally a profile with convex edges, called “rounded”, or “shell-shaped", allowing a clean cut and a long life of the blade wire.
  • the documents JP-2007 307658 , US-2,222,361 , or the embodiment of Figure 10 of the document WO-2010007171 propose a device of the type with endless mobile abrasive belts each provided with an abrasive top surface and a bottom surface.
  • These documents more particularly describe devices in which the movable bands are offset longitudinally and arranged crosswise, to form a crossing line which defines, on one side, a sharpening dihedral (formed by the moving top surfaces of said bands ), and on the other side, an underlying dihedral (formed by the moving undersurfaces of the bands).
  • these sharpening devices are formed of three abrasive bands: - a first band guided by a driving pulley in the lower part and by a return pulley in the upper part, and - two second bands, arranged longitudinally on either side of the first, both guided by said lower driving pulley, and by another upper return pulley.
  • the sharpening operation is carried out by positioning the cutting edge of the tool in the sharpening dihedral, against the crossing line of the bands, in particular in the median plane of this sharpening dihedral.
  • a support roller adjustable in position in a vertical plane is provided at the level of the underlying dihedral, with its active surface in contact with the underside surfaces of the bands, to allow adjustment of the angle of the sharpening dihedral .
  • two support rods are provided at the level of the underlying dihedral, resting against the endless bands, to allow the angle of the sharpening dihedral to be modified depending on the support applied to the cutting edge of the tool to be sharpened.
  • the corresponding devices can only make it possible to obtain such a convex cutting edge profile through the dexterity of the operator, or from several sharpening stages, by modifying the sharpening angle by successions of adjustments of the support roller.
  • the present invention proposes a simple and original solution for improving sharpening devices as described in the documents JP-2007 307658 , WO-2010007171 Or US-2,222,361 , in order to automatically obtain a rounded edge profile, by simple movements of the blade in the median plane of the sharpening dihedral.
  • the present invention provides for the presence of means of support against the at least one of the underside surfaces of the bands, at the level of the underlying dihedral, which are adapted to alternately vary the angle of the sharpening dihedral during the movement of said bands.
  • Such a feature allows automatic variation of the sharpening angles of the blade to be sharpened, to obtain a shell or convex edge profile, this by simple movements of the blade in the plane or substantially in the median plane of the dihedral of sharpening.
  • the support means in question are adapted to generate reciprocating movements whose frequency, per second, is greater than 10, and preferably greater than 20.
  • these support means consist of a support roller whose active surface is cylindrical, which support roller is mounted to rotate around an axis off-centered relative to the axis of said cylindrical active surface.
  • the axis of rotation of the support roller extends parallel or substantially parallel to the crossing line of the bands, and it is located in the plane or substantially in the median plane of the sharpening dihedral.
  • the sharpening device comprises means for adjusting the position of the support roller, in the plane or substantially in the median plane of the sharpening dihedral.
  • adjustment means then advantageously consist of an elongated slot which extends perpendicular to the axis of said support roller, along which said roller is movable, and on which said roller can be locked in position, by any means of suitable locking.
  • the support roller is according to the invention mounted loosely around its axis of rotation, its active peripheral surface being in contact with said underlying dihedral formed by the undersides of said strips, and said support roller being driven in rotational movement by said bottom surfaces of said moving bands.
  • the abrasive bands wind on a common driving pulley, arranged on the side of the underlying dihedral, and on return pulleys, arranged on the side of the sharpening dihedral.
  • the sharpening device advantageously comprises, on the one hand, a first abrasive belt guided by a driving pulley and by a first return pulley, and on the other hand, two second abrasive belts, arranged longitudinally on either side other of the first abrasive belt, and guided by said driving pulley and by another return pulley.
  • the axes of rotation of the driving pulley, the return pulleys and the support roller are then advantageously parallel to each other, and the median plane of the sharpening dihedral extends vertically or substantially vertically, the pulleys of return being provided in the upper part, and the driving pulley in the lower part.
  • the sharpening device comprises a support frame on which said return pulleys and said support means are mounted, said driving pulley being driven in rotation by a motor carried by a carriage which is slidably mounted on a system of slides provided on said support frame, which slides are adapted to ensure automatic tensioning of said strips by the weight or at least part of the weight of said motorization.
  • This feature allows automatic tensioning of the bands, and authorizes, if necessary, a rapid change of these bands.
  • Said slides preferably extend in a plane perpendicular to the axis of rotation of the driving pulley and to the median plane of the sharpening dihedral.
  • said support frame preferably comprises a support plate from one of the faces of which extend overhanging said return pulleys and said support means, and against the other face of which said slides are provided.
  • the plane in which the abrasive belts extend is inclined forward relative to the vertical, at an angle between 25° and 45°, this to optimize the ergonomics of the operation. 'sharpening.
  • the invention also relates to a sharpening method for a knife-type cutting tool blade or the like according to claim 12.
  • the sharpening device 1 illustrated on the figures 1 to 9 includes three abrasive belts 2, 3 and 4, in the form of endless belts.
  • a first strip 2 winds around a lower driving pulley 5 and around a first upper return pulley 6; and two second bands 3 and 4 wind around said lower driving pulley 5 and around a second return pulley 7, this parallel to each other, and arranged longitudinally on either side of said first band 2.
  • the endless bands 2, 3 and 4 are advantageously identical to each other. They comprise an active abrasive top surface 2 a , 3 a , 4 a and an advantageously non-abrasive bottom surface 2 b , 3 b , 4 b .
  • Any abrasive belt known to those skilled in the art can be used for the use of the sharpening device 1.
  • the axis 5' of the common driving pulley 5 extends parallel to the axis 6', 7' of the two return pulleys 6, 7.
  • the two return pulleys 6 and 7 are arranged in the same horizontal plane, their axes 6', 7' being placed symmetrically with respect to the vertical plane through which the axis 5' of the driving pulley 5 passes.
  • the abrasive belt 2, on the one hand, and the abrasive belts 3 and 4, on the other hand, are thus arranged in a cross, that is to say they cross to form a crossing line 8.
  • This crossing line 8 defines, on one side (in the upper part) an upper sharpening dihedral 9 formed by the abrasive top surfaces 2 a , 3 a , 4 a of the bands 2, 3, 4, and the other side (in the lower part) a lower dihedral 10, called “underlying dihedral”, formed by the lower surfaces 2 b , 3 b , 4 b of bands 2, 3 and 4.
  • the upper return pulleys 6 and 7 are mounted free to rotate on a support frame 11 of the sharpening device 1.
  • the driving pulley 5 here has a diameter of between 3 and 4 times the diameter of the return pulleys 6 and 7; preferably the driving pulley 5 and the return pulleys 6, 7 have peripheral grooves adapted to maintaining the position of the bands 2, 3 and 4 which they guide.
  • the driving pulley 5 is rotated by a motor 12, preferably an electric motor.
  • the sharpening device 1 includes an on/off switch 12 a , for switching the motor 12 on or off, visible on the figure 2 , 4 and 5 .
  • this motorization 12 is carried by a carriage 13 which is slidably mounted, on a system of slides 14 provided on the support frame 11, in a plane perpendicular or substantially perpendicular to the axis of the driving pulley 5 ( Figure 6 ).
  • These support means consist here of a support roller 15 mounted idly in rotation around an axis 15 a secured to the chassis 11, and whose active surface 15 b (corresponding to its peripheral surface) comprises at least one off-center zone relative to said axis 15 a .
  • this support roller 15 comprises an active surface 15 b which is cylindrical, which cylindrical surface 15 b is not centered on the axis of rotation 15 a .
  • the cylindrical active surface 15 b of the support roller 15 is placed in contact with the underlying dihedral 10 mentioned above, formed by the bottom faces 2 b , 3 b , 4 b of the bands 2, 3 and 4.
  • This active surface is preferably knurled to optimize the rotational drive of the roller 15.
  • this support roller 15 is driven in rotation around its axis 15 a by the friction, on its periphery, of the surface below 2 b , 3 b , 4 b of the different bands 2, 3, 4 , themselves driven by the motorized pulley 5.
  • driving the motorized pulley 5 in a clockwise direction, according to the orientation arrow 16 ensures the driving of the bands 2, on the one hand, and 3, 4, on the other hand, according to the orientation arrows 17 and 18, respectively.
  • the return pulleys 6 and 7 here rotate in a clockwise direction, driven by said bands 2, 3 and 4, and the support roller 15 also rotates in a clockwise direction, as illustrated by the orientation arrow 19.
  • the sharpening dihedral 9 comprises a median plane P on either side of which the return pulleys 6, 7 are arranged and in which the axis 15 a of the support roller 15 and the axis 5' extend of the driving pulley 5. This sharpening dihedral 9 is located above the crossing line 8, the latter being located above the underlying dihedral 10, the support roller 15 and the driving pulley 5 .
  • the movement of the bands 2 and 3, 4 allows an operator to sharpen a tool blade placed at the level of the sharpening dihedral 9, with its cutting edge resting against the crossing line 8 of the bands 2, 3 and 4.
  • the “rounded” cutting edge is obtained automatically due to the alternating variations in the positioning of the plane of the active surface 2a , 3a , 4a of the bands 2 and 3, 4, thanks to the rotation of the roller with an off-centered axis 15.
  • the offset of the axis 15 a of the support roller 15 relative to the axis of its cylindrical active surface 15 b can be a few tenths of a millimeter, for example of the order of 0.2 to 1 mm, for a support roller 15 having 42 mm in diameter, a driving pulley 5 having 100 mm in diameter and return pulleys 6, 7 having 33 mm in diameter.
  • the value of the alternative angular variation sought for the sharpening dihedral 9 can be determined by adjusting the position of the support roller 15 in the plane or substantially in the plane of said sharpening dihedral 9.
  • the corresponding adjustment means can consist of an elongated slot, provided perpendicular to the axis of the support roller 15, in the plane or substantially in the median plane P of the dihedral sharpening device 9, along which said roller 15 is movably mounted, and on which said roller 15 can be locked in position, by any suitable locking means (for example by a screw-nut type locking system).
  • the support means 15 in association with the drive characteristics of the bands 2, 3, 4 are advantageously adapted to generate reciprocating movements whose frequency is greater than 10 per second, and preferably greater at 20 per second, and more preferably between 30 and 70 per second.
  • the support frame 11 of the sharpening device 1 comprises in particular a lower base 20 intended to rest on any suitable support, for example a table or a receiving tray, from which extend upwards two connected lateral sides 21 by a spacer plate 22.
  • the two lateral sides 21 form part of the peripheral casing of the sharpening device 1.
  • the spacer plate 22 extends inside the device. It serves in particular as a support for the axes of the two return pulleys 6 and 7, and for the axis of the support roller 15, which extend overhanging from one of its faces; its opposite face serves as a support for the slides 14 for guiding the carriage 13 ( figure 2 ).
  • This support plate 22 may include the aforementioned elongated slot for adjusting the positioning of the support roller 15, the axis of the latter then being equipped with the associated removable locking means (for example in the form of a screw-nut system).
  • This support plate 22 also includes an upper middle opening 23 making it possible not to hinder the movements of the tool blade that is to be sharpened, during its sharpening operation, as well as a lower opening 24 for free movement. in translation of the carriage 13/motorization 12/pulley 5 assembly, along the aforementioned slide system 14.
  • the support plate 22 advantageously extends in a plane inclined towards the front when the sharpening device 1 is in position on its table or its receiving plate, so that the different strips 2, 3, 4 extend in a parallel inclined plane, in order to improve the ergonomics of sharpening operations.
  • the corresponding angle of inclination has, relative to the vertical, visible on the figure 5 , can be of the order of 25° to 45°.
  • the sharpening device 1 advantageously comprises a peripheral casing adapted to protect its constituent functional elements, as well as the operator responsible for sharpening a tool blade.
  • This peripheral casing comprises in particular a front part to hide the driving pulley 5 and the support roller 15, as well as a rear part to hide the motorization 12, which do not appear on the figures 1 to 6 to facilitate the understanding of the structure of the sharpening device 1.
  • front and rear parts of the casing are preferably provided as removable.
  • a blade guide device 26 in the general shape of a V, the tip of which is open downwards.
  • a stop structure 27 with a V-shaped section, ensures the protection of the internal mechanics against attacks from dust linked to sharpening, and against possible blade blows.
  • This stop structure 27 is preferably made of a material that is not aggressive to the blade, for example polypropylene; it can be attached to the rear part of the protective casing.
  • Fixed discs 28 are positioned at the overhanging end of the axes of the return pulleys 6 and 7, to protect these pulleys 6 and 7 against attacks from the blades during sharpening.
  • the support means 15 can be in a form other than a rotating roller with an off-center active surface.
  • these support means 15 can consist of a roller with an elongated section, for example oval, or even of a movable structure in horizontal translation, according to alternating movements, and whose ends come to rest against the surfaces below 2 b ; 3 b , 4 b of bands 2; 3, 4 in order to alternately vary the angle of the sharpening dihedral 9.
  • the support means 15 can also be adapted to come into contact with only one of said strips 2, 3, 4, or two of them .

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

Description

DOMAINE TECHNIQUE AUQUEL SE RAPPORTE L'INVENTIONTECHNICAL FIELD TO WHICH THE INVENTION RELATES

La présente invention concerne le domaine général des dispositifs pour affûter les lames d'outils coupants type couteaux ou similaires.The present invention relates to the general field of devices for sharpening the blades of cutting tools such as knives or the like.

Elle concerne plus particulièrement un tel dispositif d'affûtage comprenant au moins deux bandes abrasives mobiles munies chacune d'une surface de dessus active abrasive et d'une surface de dessous, lesquelles bandes sont décalées longitudinalement et disposées en croix pour former une ligne de croisement définissant, d'un côté, un dièdre d'affûtage formé par lesdites surfaces de dessus en mouvement desdites bandes, et de l'autre côté, un dièdre sous-jacent, formé par lesdites surfaces de dessous en mouvement desdites bandes. Et elle concerne encore un procédé d'affûtage au moyen d'un tel dispositif.It relates more particularly to such a sharpening device comprising at least two movable abrasive belts each provided with an active abrasive top surface and a bottom surface, which belts are offset longitudinally and arranged in a cross to form a crossing line defining, on one side, a sharpening dihedral formed by said moving top surfaces of said bands, and on the other side, an underlying dihedral, formed by said moving bottom surfaces of said bands. And it also relates to a sharpening process using such a device.

ARRIERE-PLAN TECHNOLOGIQUETECHNOLOGICAL BACKGROUND

Pour que la lame d'un outil tranchant tel qu'un couteau conserve le bon pouvoir de coupe, il est nécessaire de la soumettre à des opérations d'affilage régulières et aussi à des opérations d'affûtage, lorsque l'affilage ne restitue plus suffisamment de pouvoir de coupe.For the blade of a cutting tool such as a knife to maintain good cutting power, it is necessary to subject it to regular sharpening operations and also to sharpening operations, when sharpening no longer restores enough cutting power.

L'affûtage d'une lame peut être réalisé par un opérateur, sur une meule à pierre, à bande, ou autre.The sharpening of a blade can be carried out by an operator, on a stone, belt, or other grinding wheel.

Dans ce cas, l'opération nécessite de l'expérience et une bonne dextérité pour obtenir le profil de taillant recherché, à savoir généralement un profil à bords convexes, dit « bombé », ou « en obus », permettant une découpe nette et une longue durée de vie du fil de la lame.In this case, the operation requires experience and good dexterity to obtain the desired cutting profile, generally a profile with convex edges, called "rounded", or "shell-shaped", allowing a clean cut and a long life of the blade wire.

Le document JP-2007 307658 divulgue le préambule des revendications 1 et 12.The document JP-2007 307658 discloses the preamble of claims 1 and 12.

Pour faciliter ces opérations d'affûtage, les documents JP-2007 307658 , US-2 222 361 , ou encore le mode de réalisation de la figure 10 du document WO-2010007171 , proposent un dispositif du type à bandes sans fin abrasives mobiles munies chacune d'une surface de dessus abrasive et d'une surface de dessous. Ces documents décrivent plus particulièrement des dispositifs dans lesquels les bandes mobiles sont décalées longitudinalement et disposées en croix, pour former une ligne de croisement qui définit, d'un côté, un dièdre d'affûtage (formé par les surfaces de dessus en mouvement desdites bandes), et de l'autre côté, un dièdre sous-jacent (formé par les surfaces de dessous en mouvement des bandes).To facilitate these sharpening operations, the documents JP-2007 307658 , US-2,222,361 , or the embodiment of Figure 10 of the document WO-2010007171 , propose a device of the type with endless mobile abrasive belts each provided with an abrasive top surface and a bottom surface. These documents more particularly describe devices in which the movable bands are offset longitudinally and arranged crosswise, to form a crossing line which defines, on one side, a sharpening dihedral (formed by the moving top surfaces of said bands ), and on the other side, an underlying dihedral (formed by the moving undersurfaces of the bands).

En l'occurrence, ces dispositifs d'affûtage sont formés de trois bandes abrasives : - une première bande guidée par une poulie motrice en partie basse et par une poulie de renvoi en partie haute, et - deux secondes bandes, disposées longitudinalement de part et d'autre de la première, guidées toutes deux par ladite poulie motrice inférieure, et par une autre poulie de renvoi supérieure.In this case, these sharpening devices are formed of three abrasive bands: - a first band guided by a driving pulley in the lower part and by a return pulley in the upper part, and - two second bands, arranged longitudinally on either side of the first, both guided by said lower driving pulley, and by another upper return pulley.

L'opération d'affûtage est réalisée en positionnant le taillant de l'outil dans le dièdre d'affûtage, contre la ligne de croisement des bandes, en particulier dans le plan médian de ce dièdre d'affûtage.The sharpening operation is carried out by positioning the cutting edge of the tool in the sharpening dihedral, against the crossing line of the bands, in particular in the median plane of this sharpening dihedral.

Dans le mode de réalisation de la figure 10 du document WO-2010007171 , un galet d'appui réglable en position dans un plan vertical est prévu au niveau du dièdre sous-jacent, avec sa surface active en contact avec les surfaces de dessous des bandes, pour permettre un réglage de l'angle du dièdre d'affûtage. Dans le document JP-2007 307658 , deux tiges d'appui (repérées 58) sont prévues au niveau du dièdre sous-jacent, en appui contre les bandes sans fin, pour permettre de modifier l'angle du dièdre d'affûtage en fonction de l'appui appliqué sur le taillant de l'outil à affûter.In the embodiment of Figure 10 of the document WO-2010007171 , a support roller adjustable in position in a vertical plane is provided at the level of the underlying dihedral, with its active surface in contact with the underside surfaces of the bands, to allow adjustment of the angle of the sharpening dihedral . In the document JP-2007 307658 , two support rods (marked 58) are provided at the level of the underlying dihedral, resting against the endless bands, to allow the angle of the sharpening dihedral to be modified depending on the support applied to the cutting edge of the tool to be sharpened.

Mais de tels dispositifs ne permettent pas d'obtenir facilement le profil bombé de taillant recherché.But such devices do not make it possible to easily obtain the desired curved cutting profile.

En effet, les dispositifs correspondants ne peuvent permettre l'obtention d'un tel profil de taillant bombé, que par la dextérité de l'opérateur, ou alors à partir de plusieurs étapes d'affûtage, en modifiant l'angle d'affûtage par des successions de réglages du galet d'appui.Indeed, the corresponding devices can only make it possible to obtain such a convex cutting edge profile through the dexterity of the operator, or from several sharpening stages, by modifying the sharpening angle by successions of adjustments of the support roller.

OBJET DE L'INVENTIONOBJECT OF THE INVENTION

La présente invention propose une solution simple et originale pour perfectionner les dispositifs d'affûtage tels que décrits dans les documents JP-2007 307658 , WO-2010007171 ou US-2 222 361 , afin d'obtenir automatiquement un profil bombé de taillant, par de simples mouvements de la lame dans le plan médian du dièdre d'affûtage.The present invention proposes a simple and original solution for improving sharpening devices as described in the documents JP-2007 307658 , WO-2010007171 Or US-2,222,361 , in order to automatically obtain a rounded edge profile, by simple movements of the blade in the median plane of the sharpening dihedral.

Pour cela, et dans le cadre d'un dispositif d'affûtage tel que décrit dans la revendication 1, c'est-à-dire comprenant des bandes abrasives disposées en croix, la présente invention prévoit la présence de moyens d'appui contre l'une au moins des surfaces de dessous des bandes, au niveau du dièdre sous-jacent, qui sont adaptés pour faire varier de manière alternative l'angle du dièdre d'affûtage lors du mouvement desdites bandes.For this, and in the context of a sharpening device as described in claim 1, that is to say comprising abrasive bands arranged in a cross, the present invention provides for the presence of means of support against the at least one of the underside surfaces of the bands, at the level of the underlying dihedral, which are adapted to alternately vary the angle of the sharpening dihedral during the movement of said bands.

Une telle particularité permet une variation automatique des angles d'affûtage de la lame à affûter, pour obtenir un profil de tranchant en obus ou bombé, cela par de simples mouvements de la lame dans le plan ou sensiblement dans le plan médian du dièdre d'affûtage.Such a feature allows automatic variation of the sharpening angles of the blade to be sharpened, to obtain a shell or convex edge profile, this by simple movements of the blade in the plane or substantially in the median plane of the dihedral of sharpening.

Selon une caractéristique préférentielle, les moyens d'appui en question sont adaptés pour générer des mouvements alternatifs dont la fréquence, par seconde, est supérieure à 10, et de préférence supérieure à 20.According to a preferred characteristic, the support means in question are adapted to generate reciprocating movements whose frequency, per second, is greater than 10, and preferably greater than 20.

Toujours selon une forme de réalisation préférée, ces moyens d'appui consistent en un galet d'appui dont la surface active est cylindrique, lequel galet d'appui est monté à rotation autour d'un axe décentré par rapport à l'axe de ladite surface active cylindrique.Still according to a preferred embodiment, these support means consist of a support roller whose active surface is cylindrical, which support roller is mounted to rotate around an axis off-centered relative to the axis of said cylindrical active surface.

De préférence, l'axe de rotation du galet d'appui s'étend parallèlement ou sensiblement parallèlement à la ligne de croisement des bandes, et il se situe dans le plan ou sensiblement dans le plan médian du dièdre d'affûtage.Preferably, the axis of rotation of the support roller extends parallel or substantially parallel to the crossing line of the bands, and it is located in the plane or substantially in the median plane of the sharpening dihedral.

Selon une autre caractéristique, le dispositif d'affûtage comporte des moyens pour le réglage de la position du galet d'appui, dans le plan ou sensiblement dans le plan médian du dièdre d'affûtage.According to another characteristic, the sharpening device comprises means for adjusting the position of the support roller, in the plane or substantially in the median plane of the sharpening dihedral.

Ces moyens de réglage consistent alors avantageusement en une lumière allongée qui s'étend perpendiculairement à l'axe dudit galet d'appui, le long de laquelle ledit galet est mobile, et sur laquelle ledit galet peut se verrouiller en position, par tout moyen de verrouillage adapté.These adjustment means then advantageously consist of an elongated slot which extends perpendicular to the axis of said support roller, along which said roller is movable, and on which said roller can be locked in position, by any means of suitable locking.

Le galet d'appui est selon l'invention monté fou autour de son axe de rotation, sa surface périphérique active étant en contact avec ledit dièdre sous-jacent formé par les faces de dessous desdites bandes, et ledit galet d'appui étant entraîné en mouvement de rotation par lesdites surfaces de dessous desdites bandes en mouvement.The support roller is according to the invention mounted loosely around its axis of rotation, its active peripheral surface being in contact with said underlying dihedral formed by the undersides of said strips, and said support roller being driven in rotational movement by said bottom surfaces of said moving bands.

Selon encore une autre caractéristique, les bandes abrasives s'enroulent sur une poulie motrice commune, aménagée du côté du dièdre sous-jacent, et sur des poulies de renvoi, aménagées du côté du dièdre d'affûtage.According to yet another characteristic, the abrasive bands wind on a common driving pulley, arranged on the side of the underlying dihedral, and on return pulleys, arranged on the side of the sharpening dihedral.

Dans ce cadre, le dispositif d'affûtage comporte avantageusement, d'une part, une première bande abrasive guidée par une poulie motrice et par une première poulie de renvoi, et d'autre part, deux secondes bandes abrasives, disposées longitudinalement de part et d'autre de la première bande abrasive, et guidées par ladite poulie motrice et par une autre poulie de renvoi.In this context, the sharpening device advantageously comprises, on the one hand, a first abrasive belt guided by a driving pulley and by a first return pulley, and on the other hand, two second abrasive belts, arranged longitudinally on either side other of the first abrasive belt, and guided by said driving pulley and by another return pulley.

Les axes de rotation de la poulie motrice, des poulies de renvoi et du galet d'appui sont alors avantageusement parallèles entre eux, et le plan médian du dièdre d'affûtage s'étend verticalement ou sensiblement verticalement, les poulies de renvoi étant ménagées en partie supérieure, et la poulie motrice en partie inférieure.The axes of rotation of the driving pulley, the return pulleys and the support roller are then advantageously parallel to each other, and the median plane of the sharpening dihedral extends vertically or substantially vertically, the pulleys of return being provided in the upper part, and the driving pulley in the lower part.

Selon encore une autre caractéristique, le dispositif d'affûtage comporte un châssis support sur lequel sont montés lesdites poulies de renvoi et lesdits moyens d'appui, ladite poulie motrice étant entraînée en rotation par une motorisation portée par un chariot qui est monté coulissant sur un système de glissières ménagé sur ledit châssis support, lesquelles glissières sont adaptées pour assurer une mise en tension automatique desdites bandes par le poids ou tout au moins une partie du poids de ladite motorisation.According to yet another characteristic, the sharpening device comprises a support frame on which said return pulleys and said support means are mounted, said driving pulley being driven in rotation by a motor carried by a carriage which is slidably mounted on a system of slides provided on said support frame, which slides are adapted to ensure automatic tensioning of said strips by the weight or at least part of the weight of said motorization.

Cette particularité permet une mise en tension automatique des bandes, et autorise, le cas échéant, un changement rapide de ces bandes.This feature allows automatic tensioning of the bands, and authorizes, if necessary, a rapid change of these bands.

Lesdites glissières s'étendent de préférence dans un plan perpendiculaire à l'axe de rotation de la poulie motrice et au plan médian du dièdre d'affûtage.Said slides preferably extend in a plane perpendicular to the axis of rotation of the driving pulley and to the median plane of the sharpening dihedral.

En outre, ledit châssis support comporte de préférence une plaque support à partir de l'une des faces de laquelle s'étendent en porte-à-faux lesdites poulies de renvoi et lesdits moyens d'appui, et contre l'autre face de laquelle sont ménagées lesdites glissières.Furthermore, said support frame preferably comprises a support plate from one of the faces of which extend overhanging said return pulleys and said support means, and against the other face of which said slides are provided.

Selon encore une autre caractéristique, le plan dans lequel s'étendent les bandes abrasives est incliné vers l'avant par rapport à la verticale, selon un angle compris entre 25° et 45°, cela pour optimiser l'ergmomie de l'opération d'affûtage.According to yet another characteristic, the plane in which the abrasive belts extend is inclined forward relative to the vertical, at an angle between 25° and 45°, this to optimize the ergonomics of the operation. 'sharpening.

L'invention concerne encore un procédé d'affûtage pour une lame d'outil coupant type couteau ou similaire selon la revendication 12.The invention also relates to a sharpening method for a knife-type cutting tool blade or the like according to claim 12.

DESCRIPTION DETAILLEE D'UN EXEMPLE DE REALISATIONDETAILED DESCRIPTION OF AN EXAMPLE OF WORK

L'invention sera encore illustrée, sans être aucunement limitée, par la description suivante d'une forme de réalisation particulière, donnée uniquement à titre d'exemple et représentée sur les dessins annexés dans lesquels :

  • la figure 1 est une vue en perspective, légèrement par devant, d'un dispositif d'affûtage conforme à l'invention, une partie de son carter périphérique de protection ayant été enlevée ;
  • la figure 2 est une vue en perspective par l'arrière du dispositif d'affûtage de la figure 1 ;
  • la figure 3 montre le dispositif d'affûtage des figures 1 et 2 vu de face ;
  • la figure 4 est une vue de dessus du dispositif d'affûtage des figures 1 à 3 ;
  • la figure 5 est une vue de côté du dispositif d'affûtage des figures 1 à 4 ;
  • la figure 6 est une vue en perspective partielle par l'arrière du dispositif d'affûtage des figures 1 à 5, la quasi totalité de son châssis support ayant été enlevée ;
  • la figure 7 est une vue schématique en perspective des bandes abrasives du dispositif d'affûtage des figures 1 à 6, enroulées autour de leur poulie motrice et de leur poulie de renvoi, et associées au galet d'appui assurant la variation alternative de l'angle du dièdre d'affûtage ;
  • la figure 8 est une vue de face de l'ensemble bandes/poulies/galet d'appui de la figure 5 ;
  • la figure 9 est une vue de face isolée, du galet d'appui, illustrant sa surface cylindrique active décentrée.
The invention will be further illustrated, without being in any way limited, by the following description of a particular embodiment, given solely by way of example and represented in the appended drawings in which:
  • there figure 1 is a perspective view, slightly from the front, of a sharpening device according to the invention, part of its peripheral protective casing having been removed;
  • there figure 2 is a perspective view from the rear of the sharpening device of the figure 1 ;
  • there Figure 3 shows the sharpening device figures 1 and 2 seen from the front;
  • there figure 4 is a top view of the sharpening device figures 1 to 3 ;
  • there figure 5 is a side view of the sharpening device figures 1 to 4 ;
  • there Figure 6 is a partial perspective view from the rear of the sharpening device figures 1 to 5 , almost all of its support frame having been removed;
  • there Figure 7 is a schematic perspective view of the abrasive belts of the sharpening device figures 1 to 6 , wound around their driving pulley and their return pulley, and associated with the support roller ensuring the alternating variation of the angle of the sharpening dihedral;
  • there figure 8 is a front view of the belt/pulley/support roller assembly of the figure 5 ;
  • there Figure 9 is an isolated front view of the support roller, illustrating its off-centered active cylindrical surface.

Le dispositif d'affûtage 1 illustré sur les figures 1 à 9 comprend trois bandes abrasives 2, 3 et 4, en forme de bandes sans fin. Une première bande 2 s'enroule autour d'une poulie motrice 5 inférieure et autour d'une première poulie de renvoi 6 supérieure ; et deux secondes bandes 3 et 4 s'enroulent autour de ladite poulie motrice inférieure 5 et autour d'une seconde poulie de renvoi 7, cela parallèlement entre elles, et disposées longitudinalement de part et d'autre de ladite première bande 2.The sharpening device 1 illustrated on the figures 1 to 9 includes three abrasive belts 2, 3 and 4, in the form of endless belts. A first strip 2 winds around a lower driving pulley 5 and around a first upper return pulley 6; and two second bands 3 and 4 wind around said lower driving pulley 5 and around a second return pulley 7, this parallel to each other, and arranged longitudinally on either side of said first band 2.

Les bandes sans fin 2, 3 et 4 sont avantageusement identiques entre elles. Elles comportent une surface de dessus 2a, 3a, 4a active abrasive et une surface de dessous 2b, 3b, 4b avantageusement non abrasive.The endless bands 2, 3 and 4 are advantageously identical to each other. They comprise an active abrasive top surface 2 a , 3 a , 4 a and an advantageously non-abrasive bottom surface 2 b , 3 b , 4 b .

Toute bande abrasive connue de l'homme du métier peut être utilisée pour la mise en oeuvre du dispositif d'affûtage 1.Any abrasive belt known to those skilled in the art can be used for the use of the sharpening device 1.

L'axe 5' de la poulie motrice commune 5 s'étend parallèlement à l'axe 6', 7' des deux poulies de renvoi 6, 7.The axis 5' of the common driving pulley 5 extends parallel to the axis 6', 7' of the two return pulleys 6, 7.

Les deux poulies de renvoi 6 et 7 sont disposées dans le même plan horizontal, leurs axes 6', 7' étant placés de manière symétrique par rapport au plan vertical par lequel passe l'axe 5' de la poulie motrice 5.The two return pulleys 6 and 7 are arranged in the same horizontal plane, their axes 6', 7' being placed symmetrically with respect to the vertical plane through which the axis 5' of the driving pulley 5 passes.

La bande abrasive 2, d'une part, et les bandes abrasives 3 et 4, d'autre part, sont ainsi agencées en croix, c'est-à-dire qu'elles se croisent pour former une ligne de croisement 8.The abrasive belt 2, on the one hand, and the abrasive belts 3 and 4, on the other hand, are thus arranged in a cross, that is to say they cross to form a crossing line 8.

Cette ligne de croisement 8 définit, d'un côté (en partie supérieure) un dièdre d'affûtage 9 supérieur formé par les surfaces de dessus abrasives 2a, 3a, 4a des bandes 2, 3, 4, et de l'autre côté (en partie inférieure) un dièdre 10 inférieur, dit « dièdre sous-jacent », formé par les surfaces de dessous 2b, 3b, 4b des bandes 2, 3 et 4.This crossing line 8 defines, on one side (in the upper part) an upper sharpening dihedral 9 formed by the abrasive top surfaces 2 a , 3 a , 4 a of the bands 2, 3, 4, and the other side (in the lower part) a lower dihedral 10, called “underlying dihedral”, formed by the lower surfaces 2 b , 3 b , 4 b of bands 2, 3 and 4.

Les poulies de renvoi supérieures 6 et 7 sont montées libres en rotation sur un châssis support 11 du dispositif d'affûtage 1.The upper return pulleys 6 and 7 are mounted free to rotate on a support frame 11 of the sharpening device 1.

La poulie motrice 5 a ici un diamètre compris entre 3 et 4 fois le diamètre des poulies de renvoi 6 et 7 ; de préférence la poulie motrice 5 et les poulies de renvoi 6, 7 comportent des gorges périphériques adaptées au maintien en position des bandes 2, 3 et 4 qu'elles guident.The driving pulley 5 here has a diameter of between 3 and 4 times the diameter of the return pulleys 6 and 7; preferably the driving pulley 5 and the return pulleys 6, 7 have peripheral grooves adapted to maintaining the position of the bands 2, 3 and 4 which they guide.

D'autre part, la poulie motrice 5 est entraînée en rotation par une motorisation 12, de préférence une motorisation électrique. Le dispositif d'affûtage 1 comporte un interrupteur marche/arrêt 12a, pour la mise en marche ou l'arrêt de la motorisation 12, visible sur les figures 2, 4 et 5.On the other hand, the driving pulley 5 is rotated by a motor 12, preferably an electric motor. The sharpening device 1 includes an on/off switch 12 a , for switching the motor 12 on or off, visible on the figure 2 , 4 and 5 .

Selon une caractéristique du dispositif d'affûtage 1, cette motorisation 12 est portée par un chariot 13 qui est monté coulissant, sur un système de glissières 14 ménagé sur le châssis support 11, dans un plan perpendiculaire ou sensiblement perpendiculaire à l'axe de la poulie motrice 5 (figure 6).According to a characteristic of the sharpening device 1, this motorization 12 is carried by a carriage 13 which is slidably mounted, on a system of slides 14 provided on the support frame 11, in a plane perpendicular or substantially perpendicular to the axis of the driving pulley 5 ( Figure 6 ).

Ce chariot 13 monté à coulissement sur le système de glissières 14, et qui porte la motorisation 12 avec la poulie motrice 5, est supporté par les trois bandes abrasives 2, 3 et 4 (par l'intermédiaire de la poulie motrice 5), ce qui assure la mise en tension automatique de ces dernières, par le poids de l'ensemble chariot 13/motorisation 12/poulie 5, et ce qui permet aussi un remplacement rapide de ces bandes 2, 3, 4, par simple soulèvement de cet ensemble, en cas de besoin.This carriage 13 slidably mounted on the slide system 14, and which carries the motor 12 with the driving pulley 5, is supported by the three abrasive belts 2, 3 and 4 (via the driving pulley 5), this which ensures the automatic tensioning of the latter, by the weight of the carriage 13/motorization 12/pulley 5 assembly, and which also allows rapid replacement of these bands 2, 3, 4, by simply lifting this assembly , if needed.

Au niveau du dièdre sous-jacent 10 du dispositif d'affûtage 1, on remarque la présence de moyens d'appui 15 qui sont agencés, conformément à la présente invention, pour permettre une variation, de manière alternative, de l'angle du dièdre d'affûtage 9 lors du mouvement des bandes abrasives 2, 3, 4, entraînées par la poulie motrice 5.At the level of the underlying dihedral 10 of the sharpening device 1, we note the presence of support means 15 which are arranged, in accordance with the present invention, to allow variation, in an alternative manner, of the angle of the dihedral sharpening 9 during the movement of the abrasive belts 2, 3, 4, driven by the driving pulley 5.

Ces moyens d'appui consistent ici en un galet d'appui 15 monté fou en rotation autour d'un axe 15a solidaire du châssis 11, et dont la surface active 15b (correspondant à sa surface périphérique) comporte au moins une zone décentrée par rapport audit axe 15a.These support means consist here of a support roller 15 mounted idly in rotation around an axis 15 a secured to the chassis 11, and whose active surface 15 b (corresponding to its peripheral surface) comprises at least one off-center zone relative to said axis 15 a .

En l'occurrence, comme on peut le voir sur la figure 9, ce galet d'appui 15 comporte une surface active 15b qui est cylindrique, laquelle surface cylindrique 15b n'est pas centrée sur l'axe de rotation 15a.In this case, as can be seen in the Figure 9 , this support roller 15 comprises an active surface 15 b which is cylindrical, which cylindrical surface 15 b is not centered on the axis of rotation 15 a .

Pour visualiser ce décentrage, on a tracé sur la figure 9, en pointillés, un cercle virtuel 15c centré sur l'axe 15a.To visualize this decentering, we traced on the Figure 9 , dotted, a virtual circle 15 c centered on the axis 15 a .

La surface active cylindrique 15b du galet d'appui 15 est placée en contact avec le dièdre sous-jacent 10 précité, formé par les faces de dessous 2b, 3b, 4b des bandes 2, 3 et 4. Cette surface active est de préférence moletée pour optimiser l'entraînement en rotation du galet 15.The cylindrical active surface 15 b of the support roller 15 is placed in contact with the underlying dihedral 10 mentioned above, formed by the bottom faces 2 b , 3 b , 4 b of the bands 2, 3 and 4. This active surface is preferably knurled to optimize the rotational drive of the roller 15.

On comprend que ce galet d'appui 15 est entraîné en mouvement de rotation autour de son axe 15a par le frottement, sur sa périphérie, de la surface de dessous 2b, 3b, 4b des différentes bandes 2, 3, 4, elles-mêmes entraînées par la poulie motorisée 5.It is understood that this support roller 15 is driven in rotation around its axis 15 a by the friction, on its periphery, of the surface below 2 b , 3 b , 4 b of the different bands 2, 3, 4 , themselves driven by the motorized pulley 5.

Comme illustré sur la figure 8, un entraînement de la poulie motorisée 5 dans le sens horaire, selon la flèche d'orientation 16, assure l'entraînement des bandes 2, d'une part, et 3, 4, d'autre part, selon les flèches d'orientation 17 et 18, respectivement.As illustrated on the figure 8 , driving the motorized pulley 5 in a clockwise direction, according to the orientation arrow 16, ensures the driving of the bands 2, on the one hand, and 3, 4, on the other hand, according to the orientation arrows 17 and 18, respectively.

Les poulies de renvoi 6 et 7 tournent ici dans un sens horaire, entraînées par lesdites bandes 2, 3 et 4, et le galet d'appui 15 tourne également dans le sens horaire, tel qu'illustré par la flèche d'orientation 19.The return pulleys 6 and 7 here rotate in a clockwise direction, driven by said bands 2, 3 and 4, and the support roller 15 also rotates in a clockwise direction, as illustrated by the orientation arrow 19.

Le dièdre d'affûtage 9 comporte un plan médian P de part et d'autre duquel sont disposées les poulies de renvoi 6, 7 et dans lequel s'étend l'axe 15a du galet d'appui 15 et l'axe 5' de la poulie motrice 5. Ce dièdre d'affûtage 9 est situé au-dessus de la ligne de croisement 8, cette dernière étant située au-dessus du dièdre sous-jacent 10, du galet d'appui 15 et de la poulie motrice 5.The sharpening dihedral 9 comprises a median plane P on either side of which the return pulleys 6, 7 are arranged and in which the axis 15 a of the support roller 15 and the axis 5' extend of the driving pulley 5. This sharpening dihedral 9 is located above the crossing line 8, the latter being located above the underlying dihedral 10, the support roller 15 and the driving pulley 5 .

Le mouvement des bandes 2 et 3, 4 permet à un opérateur de réaliser l'affûtage d'une lame d'outil placée au niveau du dièdre d'affûtage 9, avec son taillant en appui contre la ligne de croisement 8 des bandes 2, 3 et 4.The movement of the bands 2 and 3, 4 allows an operator to sharpen a tool blade placed at the level of the sharpening dihedral 9, with its cutting edge resting against the crossing line 8 of the bands 2, 3 and 4.

Simultanément, on comprend que la rotation du galet 15 en appui contre lesdites faces de dessous 2b, 3b, 4b des bandes 2, 3, 4 modifie automatiquement, de manière alternative et en continu, l'angle du dièdre sous-jacent 10, et donc l'angle du dièdre d'affûtage 9, permettant l'obtention du taillant « bombé » recherché, cela en maintenant la lame à affûter dans le plan médian ou sensiblement dans le plan médian P du dièdre d'affûtage 9 (l'opérateur déplace alors simplement la lame en avant et/ou en arrière pour assurer l'affûtage sur toute sa longueur, en la maintenant sensiblement dans le plan médian du dièdre d'affûtage).Simultaneously, we understand that the rotation of the roller 15 bearing against said bottom faces 2 b , 3 b , 4 b of the bands 2, 3, 4 automatically modifies, alternately and continuously, the angle of the underlying dihedral 10, and therefore the angle of the sharpening dihedral 9, allowing the desired “rounded” cutting edge to be obtained, while maintaining the blade to be sharpened in the median plane or substantially in the median plane P of the sharpening dihedral 9 ( the operator then simply moves the blade forwards and/or backwards to ensure sharpening over its entire length, maintaining it substantially in the median plane of the sharpening dihedral).

Le taillant « bombé » est obtenu automatiquement du fait des variations alternées du positionnement du plan de la surface active 2a, 3a, 4a des bandes 2 et 3, 4, grâce à la rotation du galet à axe décentré 15.The “rounded” cutting edge is obtained automatically due to the alternating variations in the positioning of the plane of the active surface 2a , 3a , 4a of the bands 2 and 3, 4, thanks to the rotation of the roller with an off-centered axis 15.

Le déplacement alternatif du plan des bandes 2, 3, 4 au niveau du dièdre d'affûtage 9, et donc la variation de l'angle du dièdre d'affûtage 9, peut être adapté selon le résultat que l'on souhaite obtenir, en particulier en modifiant les caractéristiques dimensionnelles des moyens d'appui 15 et/ou leur positionnement.The alternative movement of the plane of the bands 2, 3, 4 at the level of the sharpening dihedral 9, and therefore the variation of the angle of the sharpening dihedral 9, can be adapted according to the result that one wishes to obtain, in particularly by modifying the dimensional characteristics of the support means 15 and/or their positioning.

Par exemple, le décentrage de l'axe 15a du galet d'appui 15 par rapport à l'axe de sa surface active cylindrique 15b peut être de quelques dixièmes de millimètres, par exemple de l'ordre de 0,2 à 1 mm, pour un galet d'appui 15 ayant 42 mm de diamètre, une poulie motrice 5 ayant 100 mm de diamètre et des poulies de renvoi 6, 7 ayant 33 mm de diamètre.For example, the offset of the axis 15 a of the support roller 15 relative to the axis of its cylindrical active surface 15 b can be a few tenths of a millimeter, for example of the order of 0.2 to 1 mm, for a support roller 15 having 42 mm in diameter, a driving pulley 5 having 100 mm in diameter and return pulleys 6, 7 having 33 mm in diameter.

La valeur de la variation angulaire alternative recherchée pour le dièdre d'affûtage 9 peut être déterminée par un réglage de la position du galet d'appui 15 dans le plan ou sensiblement dans le plan dudit dièdre d'affûtage 9.The value of the alternative angular variation sought for the sharpening dihedral 9 can be determined by adjusting the position of the support roller 15 in the plane or substantially in the plane of said sharpening dihedral 9.

Les moyens de réglage correspondants (non présents dans le mode de réalisation illustré sur les figures) peuvent consister en une lumière allongée, ménagée perpendiculairement à l'axe du galet d'appui 15, dans le plan ou sensiblement dans le plan médian P du dièdre d'affûtage 9, le long de laquelle ledit galet 15 est monté mobile, et sur laquelle ledit galet 15 peut venir se verrouiller en position, par tout moyen de verrouillage adapté (par exemple par un système de blocage du type vis-écrou).The corresponding adjustment means (not present in the embodiment illustrated in the figures) can consist of an elongated slot, provided perpendicular to the axis of the support roller 15, in the plane or substantially in the median plane P of the dihedral sharpening device 9, along which said roller 15 is movably mounted, and on which said roller 15 can be locked in position, by any suitable locking means (for example by a screw-nut type locking system).

Les moyens d'appui 15 en association avec les caractéristiques d'entraînement des bandes 2, 3, 4 (en particulier leur vitesse linéaire) sont avantageusement adaptés pour générer des mouvements alternatifs dont la fréquence est supérieure à 10 par seconde, et de préférence supérieure à 20 par seconde, et encore de préférence comprise entre 30 et 70 par seconde.The support means 15 in association with the drive characteristics of the bands 2, 3, 4 (in particular their linear speed) are advantageously adapted to generate reciprocating movements whose frequency is greater than 10 per second, and preferably greater at 20 per second, and more preferably between 30 and 70 per second.

Le châssis support 11 du dispositif d'affûtage 1 comporte en particulier une base inférieure 20 destinée à reposer sur tout support approprié, par exemple une table ou un plateau de réception, à partir de laquelle s'étendent vers le haut deux côtés latéraux 21 reliés par une plaque entretoise 22.The support frame 11 of the sharpening device 1 comprises in particular a lower base 20 intended to rest on any suitable support, for example a table or a receiving tray, from which extend upwards two connected lateral sides 21 by a spacer plate 22.

Les deux côtés latéraux 21 forment une partie du carter périphérique du dispositif d'affûtage 1. La plaque entretoise 22 s'étend à l'intérieur du dispositif. Elle sert notamment de support aux axes des deux poulies de renvoi 6 et 7, et à l'axe du galet d'appui 15, qui s'étendent en porte-à-faux à partir de l'une de ses faces ; sa face opposée sert de support aux glissières 14 de guidage du chariot 13 (figure 2).The two lateral sides 21 form part of the peripheral casing of the sharpening device 1. The spacer plate 22 extends inside the device. It serves in particular as a support for the axes of the two return pulleys 6 and 7, and for the axis of the support roller 15, which extend overhanging from one of its faces; its opposite face serves as a support for the slides 14 for guiding the carriage 13 ( figure 2 ).

Cette plaque support 22, non représentée sur la figure 6, peut comporter la lumière allongée précitée pour le réglage du positionnement du galet d'appui 15, l'axe de ce dernier étant alors équipé du moyen de verrouillage amovible associé (par exemple en forme de système vis-écrou).This support plate 22, not shown on the Figure 6 , may include the aforementioned elongated slot for adjusting the positioning of the support roller 15, the axis of the latter then being equipped with the associated removable locking means (for example in the form of a screw-nut system).

Cette plaque support 22 comporte encore une ouverture supérieure médiane 23 permettant de ne pas gêner les mouvements de la lame d'outil que l'on souhaite affûter, lors de son opération d'affûtage, ainsi qu'une ouverture inférieure 24 pour le mouvement libre en translation de l'ensemble chariot 13/motorisation 12/poulie 5, le long du système de glissières 14 précité.This support plate 22 also includes an upper middle opening 23 making it possible not to hinder the movements of the tool blade that is to be sharpened, during its sharpening operation, as well as a lower opening 24 for free movement. in translation of the carriage 13/motorization 12/pulley 5 assembly, along the aforementioned slide system 14.

La plaque support 22 s'étend avantageusement dans un plan incliné vers l'avant lorsque le dispositif d'affûtage 1 est en position sur sa table ou son plateau de réception, pour que les différentes bandes 2, 3, 4 s'étendent dans un plan incliné parallèle, cela afin d'améliorer l'ergonomie des opérations d'affûtage. L'angle d'inclinaison correspondant a, par rapport à la verticale, visible sur la figure 5, peut être de l'ordre de 25° à 45°.The support plate 22 advantageously extends in a plane inclined towards the front when the sharpening device 1 is in position on its table or its receiving plate, so that the different strips 2, 3, 4 extend in a parallel inclined plane, in order to improve the ergonomics of sharpening operations. The corresponding angle of inclination has, relative to the vertical, visible on the figure 5 , can be of the order of 25° to 45°.

Le dispositif d'affûtage 1 comporte avantageusement un carter périphérique adapté pour protéger ses éléments fonctionnels constitutifs, ainsi que l'opérateur chargé d'affûter une lame d'outil.The sharpening device 1 advantageously comprises a peripheral casing adapted to protect its constituent functional elements, as well as the operator responsible for sharpening a tool blade.

Ce carter périphérique comprend notamment une partie frontale pour masquer la poulie motrice 5 et le galet d'appui 15, ainsi qu'une partie arrière pour masquer la motorisation 12, qui n'apparaissent pas sur les figures 1 à 6 pour faciliter la compréhension de la structure du dispositif d'affûtage 1.This peripheral casing comprises in particular a front part to hide the driving pulley 5 and the support roller 15, as well as a rear part to hide the motorization 12, which do not appear on the figures 1 to 6 to facilitate the understanding of the structure of the sharpening device 1.

Ces parties frontale et arrière de carter sont de préférence prévues amovibles.These front and rear parts of the casing are preferably provided as removable.

Au niveau d'une ouverture 25 ménagée sur le dessus et l'avant du carter du dispositif 1 pour réaliser les opérations d'affûtage (c'est-à-dire au dessus et devant le dièdre d'affûtage 9), on remarque la présence d'un dispositif guide-lame 26 en forme générale de Vé dont la pointe est ouverte vers le bas. En outre, en arrière de ce dispositif guide-lame 26, une structure de butée 27, à section en Vé, assure la protection de la mécanique interne contre les agressions de poussières liées à l'affûtage, et contre les éventuels coups de lame. Cette structure de butée 27 est de préférence réalisée en un matériau non agressif pour la lame, par exemple en polypropylène ; elle peut être solidaire de la partie arrière du carter de protection. Des disques fixes 28 sont positionnés à l'extrémité en porte-à-faux des axes des poulies de renvoi 6 et 7, pour protéger ces poulies 6 et 7 contre les agressions des lames en cours d'affûtage.At the level of an opening 25 provided on the top and the front of the casing of the device 1 to carry out the sharpening operations (that is to say above and in front of the sharpening dihedral 9), we notice the presence of a blade guide device 26 in the general shape of a V, the tip of which is open downwards. In addition, behind this blade guide device 26, a stop structure 27, with a V-shaped section, ensures the protection of the internal mechanics against attacks from dust linked to sharpening, and against possible blade blows. This stop structure 27 is preferably made of a material that is not aggressive to the blade, for example polypropylene; it can be attached to the rear part of the protective casing. Fixed discs 28 are positioned at the overhanging end of the axes of the return pulleys 6 and 7, to protect these pulleys 6 and 7 against attacks from the blades during sharpening.

De manière alternative, les moyens d'appui 15 peuvent se présenter sous une forme autre qu'un galet rotatif avec surface active décentrée.Alternatively, the support means 15 can be in a form other than a rotating roller with an off-center active surface.

Selon un exemple qui n'est pas couvert par l'invention selon les revendications attachées, ces moyens d'appui 15 peuvent être constitués d'un galet à section allongée, par exemple ovale, ou encore d'une structure mobile en translation horizontale, selon des mouvements alternatifs, et dont les extrémités viennent prendre appui contre les surfaces de dessous 2b ; 3b, 4b des bandes 2 ; 3, 4 en vue de faire varier alternativement l'angle du dièdre d'affûtage 9.According to an example which is not covered by the invention according to the attached claims, these support means 15 can consist of a roller with an elongated section, for example oval, or even of a movable structure in horizontal translation, according to alternating movements, and whose ends come to rest against the surfaces below 2 b ; 3 b , 4 b of bands 2; 3, 4 in order to alternately vary the angle of the sharpening dihedral 9.

Selon un autre exemple qui n'est pas couvert par l'invention selon les revendications attachées, les moyens d'appui 15 peuvent aussi être adaptés pour entrer en contact avec une seule desdites bandes 2, 3, 4, ou deux d'entre elles.According to another example which is not covered by the invention according to the attached claims, the support means 15 can also be adapted to come into contact with only one of said strips 2, 3, 4, or two of them .

Claims (12)

  1. A sharpening device (1) for a cutting tool blade of the knife type or similar, said sharpening device (1) comprising at least two mobile abrasive belts (2; 3, 4) each provided with an active abrasive top surface (2a, 3a, 4a) and a bottom surface (2b, 3b, 4b), wherein the belts (2; 3, 4) being longitudinally staggered and arranged crosswise to form a crossing line (8) defining, on one side, a sharpening dihedron (9) formed by said moving top surfaces (2a, 3a, 4a) of said belts (2, 3, 4), and on the other side, an underlying dihedron (10), formed by said moving bottom surfaces (2b, 3b, 4b) of said belts (2, 3, 4),
    the device including means (15) for pressing against at least one of said bottom surfaces (2b, 3b, 4b) of said belts (2, 3, 4), at said underlying dihedron (10), which are adapted to alternately vary the angle of said sharpening dihedron during movement of said belts (2, 3, 4),
    said pressing means consisting of a pressing roller (15),
    the device being characterized in that said pressing roller is mounted so as to rotate freely about an axis of rotation (15a) and the active peripheral surface (15b) of the pressing roller (15), includes at least one area non centred on said axis of rotation (15a),
    said active peripheral surface (15b) of said pressing roller (15) being in contact with said underlying dihedron (10) formed by the bottom faces (2b, 3b, 4b) of said belts (2, 3, 4), and said pressing roller (15) being driven in rotation by said bottom surfaces (2b, 3b, 4b) of said moving belts (2, 3, 4).
  2. The sharpening device according to claim 1, characterized in that said pressing means (15) are adapted to generate alternating movements whose frequency, per second, is higher than 10, and preferably higher than 20.
  3. The sharpening device according to any one of claims 1 or 2, characterized in that said pressing means (15) consist of a pressing roller whose active surface (15b) is cylindrical, said pressing roller (15) being mounted for rotation about an axis (15a) off-centre with respect to the axis of said cylindrical active surface (15b).
  4. The sharpening device according to any one of claims 1 to 3, characterized in that the axis of rotation (15a) of said pressing roller (15) extends parallel or substantially parallel to said crossing line (8) of said belts (2, 3, 4), and is located in the median plane or substantially in the median plane of said sharpening dihedron (9).
  5. The sharpening device according to any one of claims 1 to 4, characterized in that it includes means for adjusting the position of said pressing roller (15), in the median plane or substantially in the median plane of said sharpening dihedron (9).
  6. The sharpening device according to claim 5, characterized in that said adjustment means consist of an elongated aperture that extends perpendicular to the axis of said pressing roller (15), along which said roller (15) is movable, and on which said roller (15) can be locked in position, by any suitable locking means.
  7. The sharpening device according to any one of claims 1 to 6, characterized in that said abrasive belts (2, 3, 4) are wound onto a common drive pulley (5), arranged on the side of the underlying dihedron (10), and onto deflecting pulleys (6, 7), arranged on the side of the sharpening dihedron (9).
  8. The sharpening device according to claim 7, characterized in that it includes, on the one hand, a first abrasive belt (2) guided by said drive pulley (5) and by a first deflecting pulley (6), and on the other hand, two second abrasive belts (3, 4), arranged longitudinally on either side of the first abrasive belt (2), and guided by said drive pulley (5) and by another deflecting pulley (7), the axes of rotation (5', 6', 7', 15a) of the drive pulley (5), the deflecting pulleys (6, 7) and the pressing roller (15) being parallel to each other, and the median plane (P) of the sharpening dihedron (9) extending vertically or substantially vertically, said deflecting pulleys (6, 7) being arranged at the top and said drive pulley (5) at the bottom.
  9. The sharpening device according to any one of claims 7 or 8, characterized in that it includes a support frame (11) on which are mounted said deflecting pulleys (6, 7) and said pressing means (15), said drive pulley (5) being driven in rotation by a motor (12) carried by a carriage (13) sliding on a slide system (14) arranged on said support frame (11), said slides (14) extending in a plane perpendicular to the axis of rotation (5') of the drive pulley (5) and to the median plane (P) of the sharpening dihedron (9), and being suitable to ensure an automatic tensioning of said belts (2, 3, 4) by the weight or at least part of the weight of said motor (12).
  10. The device according to claim 9, characterized in that said support frame (11) includes a support plate (22) from one face of which said deflecting pulleys (6, 7) and said pressing means (15) extend as a cantilever, and against the other face of which said slides (14) are arranged.
  11. The sharpening device according to any one of claims 1 to 10, characterized in that the plane in which the abrasive belts (2, 3, 4) extend is tilted towards the front with respect to the vertical, with an angle (a) between 25° and 45°.
  12. A method for sharpening a cutting tool blade of the knife type or similar, by means of at least two mobile abrasive belts (2, 3, 4) each provided with an active abrasive top surface (2a, 3a, 4a) and a bottom surface (2b, 3b, 4b), said belts (2, 3, 4) being longitudinally staggered and arranged crosswise to form a crossing line (8) defining, on one side, a sharpening dihedron (9) formed by said moving top surfaces (2a, 3a, 4a) of said belts (2, 3, 4), and on the other side, an underlying dihedron (10), formed by said moving bottom surfaces (2b, 3b, 4b) of said belts (2, 3, 4),
    the method consisting in implementing means (15) for pressing against at least one of said bottom surfaces (2b, 3b, 4b) of said belts (2, 3, 4), at said underlying dihedron (10), in order to alternately vary the angle of said sharpening dihedron (9) during movement of said belts (2, 3, 4),
    the method being characterized in that the angle of said sharpening dihedron (9) is varied by alternating movements whose frequency, per second, is higher than 10, and preferably higher than 20.
EP15732303.1A 2014-05-15 2015-05-13 Sharpening device having abrasive belts arranged crosswise Active EP3142830B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1454317A FR3020976B1 (en) 2014-05-15 2014-05-15 SHARPENING DEVICE WITH ABRASIVE BANDS DISPOSED IN CROSS
PCT/FR2015/051266 WO2015173518A1 (en) 2014-05-15 2015-05-13 Sharpening device having abrasive belts arranged crosswise

Publications (3)

Publication Number Publication Date
EP3142830A1 EP3142830A1 (en) 2017-03-22
EP3142830C0 EP3142830C0 (en) 2023-12-06
EP3142830B1 true EP3142830B1 (en) 2023-12-06

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Application Number Title Priority Date Filing Date
EP15732303.1A Active EP3142830B1 (en) 2014-05-15 2015-05-13 Sharpening device having abrasive belts arranged crosswise

Country Status (3)

Country Link
EP (1) EP3142830B1 (en)
FR (1) FR3020976B1 (en)
WO (1) WO2015173518A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107052915A (en) * 2017-01-23 2017-08-18 刘福民 A kind of abrasive band electric knife sharpener and its method to set up
CN112621498A (en) * 2020-12-25 2021-04-09 杭州爱科科技股份有限公司 Abrasive belt knife sharpening method and knife sharpening device thereof

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2222361A (en) * 1939-11-01 1940-11-19 Joseph E Burns Sharpening device for edged implements
US2341068A (en) * 1941-07-14 1944-02-08 John G Zummach Grinder
JP2007307658A (en) * 2006-05-18 2007-11-29 Yoshida Kinzoku Kogyo Kk Cutting tool grinding device
DE102008033547A1 (en) 2008-07-17 2010-01-21 Visonn Gmbh & Co. Kg Grinding and sharpening machine for cutting blades

Also Published As

Publication number Publication date
FR3020976B1 (en) 2016-05-13
EP3142830A1 (en) 2017-03-22
EP3142830C0 (en) 2023-12-06
FR3020976A1 (en) 2015-11-20
WO2015173518A1 (en) 2015-11-19

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