EP3142830A1 - Schärfungsvorrichtung mit kreuzweise angeordneten schleifbändern - Google Patents

Schärfungsvorrichtung mit kreuzweise angeordneten schleifbändern

Info

Publication number
EP3142830A1
EP3142830A1 EP15732303.1A EP15732303A EP3142830A1 EP 3142830 A1 EP3142830 A1 EP 3142830A1 EP 15732303 A EP15732303 A EP 15732303A EP 3142830 A1 EP3142830 A1 EP 3142830A1
Authority
EP
European Patent Office
Prior art keywords
sharpening
strips
support
abrasive
sharpening device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP15732303.1A
Other languages
English (en)
French (fr)
Other versions
EP3142830B1 (de
EP3142830C0 (de
Inventor
Jean-Pierre Bodard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bobet Materiel
Original Assignee
Bobet Materiel
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bobet Materiel filed Critical Bobet Materiel
Publication of EP3142830A1 publication Critical patent/EP3142830A1/de
Application granted granted Critical
Publication of EP3142830B1 publication Critical patent/EP3142830B1/de
Publication of EP3142830C0 publication Critical patent/EP3142830C0/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/18Accessories
    • B24B21/20Accessories for controlling or adjusting the tracking or the tension of the grinding belt
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/006Machines or devices using grinding or polishing belts; Accessories therefor for special purposes, e.g. for television tubes, car bumpers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/36Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades
    • B24B3/54Sharpening 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 like knives or the like.
  • a sharpening device comprising at least two abrasive belts each provided with an abrasive active top surface and a bottom surface, which strips are offset longitudinally and arranged in a cross to form a crossing line. defining, on one side, a sharpening wedge formed by said moving top surfaces of said strips, and on the other side, an underlying dihedral, formed by said moving bottom surfaces of said strips. And it still relates to a sharpening process by means of such a device.
  • the sharpening of a blade can be performed by an operator on a stone wheel, belt, or other.
  • the operation requires experience and good dexterity in order to obtain the desired profile of the cut, ie generally a profile with convex edges, called “curved”, or “in shell", allowing a clean cut and a long service life of the blade wire.
  • US-2,222,361 or the embodiment of Figure 10 of WO-2010007171, provides a mobile abrasive endless belt device each provided with an abrasive top surface and a bottom surface.
  • These documents more particularly describe devices in which the moving strips are longitudinally offset and arranged in a cross, to form a cross line which defines, on one side, a sharpening wedge (formed by the moving top surfaces of said strips ), and on the other side, an underlying dihedral (formed by the moving bottom surfaces of the bands).
  • these sharpening devices are formed of three abrasive belts: a first band guided by a driving pulley at the bottom and a deflection pulley at the top, and two second strips, arranged longitudinally on either side of the first, both guided by said lower drive pulley, and by another upper idler pulley.
  • the grinding operation is carried out by positioning the cutting edge of the tool in the sharpening wedge, against the crossing line of the strips, in particular in the median plane of this sharpening wedge.
  • a support roller adjustable in position in a vertical plane is provided at the level of the underlying dihedron, with its active surface in contact with the bottom surfaces of the strips. , to allow adjustment of the angle of the sharpening wedge.
  • two support rods are provided at the underlying dihedral, bearing against the endless belts, to allow the angle of the sharpening wedge to be changed as a function of 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 curved cutting profile profile, only by the dexterity of the operator, or else from several grinding steps, by modifying the sharpening angle by successions of adjustments of the support roller.
  • the present invention proposes a simple and original solution for improving the sharpening devices as described in the documents JP-2007 307658, WO-2010007171 or US-2 222 361, in order to automatically obtain a curved profile of cutting edge, by means of simple movements of the blade in the median plane of the sharpening dihedron.
  • the present invention provides the presence of support means against the at least one of the bottom surfaces of the strips, at the underlying dihedral, which are adapted to alternately vary the angle of the sharpening wedge during the movement of said bands.
  • the bearing means in question are adapted to generate reciprocating movements whose frequency, per second, is greater than 10, and preferably greater than 20.
  • the corresponding support means consist of a support roller mounted to rotate about an axis and whose active surface cooperating with the surfaces of the bottom of the strips, comprises at least one non-centered zone on said axis of rotation.
  • these support means consist of a bearing roller whose active surface is cylindrical, which support roller is rotatably mounted about an axis that is off-center with respect to the axis of said cylindrical active surface.
  • the axis of rotation of the support roller extends parallel to or substantially parallel to the crossing line of the strips, and is located in the plane or substantially in the median plane of the sharpening wedge.
  • 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 wedge.
  • adjustment means then advantageously consist of an elongate slot which extends perpendicularly 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 adapted lock.
  • the support roller is advantageously mounted idly about 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 belts are wound on a common drive pulley, arranged on the side of the underlying dihedral, and on return pulleys, arranged on the side of the sharpening wedge.
  • 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 both sides. other of the first abrasive belt, and guided by said driving pulley and another pulley.
  • the axes of rotation of the drive pulley, the return pulleys and the support roller are then advantageously parallel to each other, and the median plane of the sharpening dihedron extends vertically or substantially vertically, the pulleys of referral 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 bearing means are mounted, said driving pulley being rotated by a motor driven by a carriage which is slidably mounted on a sliding system provided on said support frame, which slides are adapted to ensure automatic tensioning of said bands by the weight or at least a portion of the weight of said engine.
  • This feature allows an automatic tensioning of the bands, and allows, 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 the median plane of the sharpening wedge.
  • said support frame preferably comprises a support plate from one of the faces of which extend cantilevered said return pulleys and said support means, and against the other face of which are provided said slides.
  • the plane in which the abrasive belts extend is inclined forwards with respect to the vertical, at an angle of between 25 ° and 45 °, in order to optimize the ergmomy of the operation of 'sharpening.
  • the invention further relates to a sharpening method for a knife-like cutting tool blade or the like, by means of at least two moving abrasive belts each provided with an abrasive active top surface and a bottom surface, which strips are longitudinally offset and arranged in a cross to form a cross line defining, on one side, a sharpening wedge formed by said moving top surfaces of said strips, and on the other side, an underlying dihedral formed by said moving bottom surfaces of said strips, which method is characterized by alternately varying the angle of said sharpening wedge during movement of said strips.
  • this method consists in alternately varying the angle of said sharpening wedge in reciprocating movements whose frequency per second is greater than 10, and preferably greater than 20.
  • FIG. 2 is a perspective view from the rear of the sharpening device of Figure 1;
  • FIG. 3 shows the sharpening device of Figures 1 and 2 seen from the front
  • FIG. 4 is a top view of the sharpening device of Figures 1 to 3;
  • FIG. 5 is a side view of the sharpening device of Figures 1 to 4;
  • FIG. 6 is a partial perspective view from the rear of the sharpening device of Figures 1 to 5, almost all of its support frame has been removed;
  • FIG. 7 is a diagrammatic perspective view of the abrasive belts of the sharpening device of FIGS. 1 to 6, wound around their drive pulley and their return pulley, and associated with the support roller ensuring the alternative variation of the angle of sharpening dihedral;
  • FIG. 8 is a front view of the strip / pulley / support roller assembly of FIG. 5;
  • FIG. 9 is an isolated front view of the support roller, illustrating its active cylindrical surface off-center.
  • the sharpening device 1 illustrated in Figures 1 to 9 comprises three abrasive strips 2, 3 and 4, in the form of endless bands.
  • a first band 2 wraps around a lower drive pulley 5 and around a first top 6 pulley; and two second strips 3 and 4 are wound around said lower drive pulley 5 and around a second return pulley 7, parallel to each other, and arranged longitudinally on either side of said first strip 2.
  • the endless belts 2, 3 and 4 are advantageously identical to each other. They comprise an abrasive top surface 2a, 3a, 4a active and a bottom surface 2b, 3b, 4b advantageously non-abrasive.
  • Any abrasive belt known to those skilled in the art can be used for the implementation of the sharpening device 1.
  • the axis 5 'of the common drive 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 that they intersect to form a cross line 8.
  • This crossing line 8 defines, on one side (in the upper part), an upper sharpening dihedron 9 formed by the abrasive top surfaces 2a, 3a, 4a of strips 2, 3, 4, and on the other side ( in the lower part) a lower dihedron 10, called "underlying dihedral", formed by the bottom surfaces 2b, 3b, 4b of the strips 2, 3 and 4.
  • the upper return pulleys 6 and 7 are rotatably mounted on a support frame 1 1 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 comprise peripheral grooves adapted to hold in position the strips 2, 3 and 4 that they guide.
  • the driving pulley 5 is rotated by a motor 12, preferably an electric motor.
  • the sharpening device 1 comprises an on / off switch 12a, for starting or stopping the operator 12, visible in Figures 2, 4 and 5.
  • this motor 12 is carried by a carriage 13 which is slidably mounted on a slide system 14 formed on the support frame 1 1, in a plane perpendicular to or substantially perpendicular to the axis of the driving pulley 5 (FIG. 6).
  • support means 15 which are arranged, according to the present invention, to allow a variation, alternatively, of the angle of the dihedron 9 during the movement of the abrasive belts 2, 3, 4, driven by the driving pulley 5.
  • These support means here consist of a support roller 15 mounted idler in rotation about an axis 15a integral with the frame 1 1, and whose active surface 15b (corresponding to its peripheral surface) comprises at least one zone which is off-center by report to this axis 15a.
  • this support roller 15 comprises an active surface 15b which is cylindrical, which cylindrical surface 15b is not centered on the axis of rotation 15a.
  • an active surface 15b which is cylindrical
  • cylindrical surface 15b is not centered on the axis of rotation 15a.
  • a virtual circle 15c centered on the axis 15a has been drawn in FIG. 9, in dashed lines.
  • the cylindrical active surface 15b of the support roller 15 is placed in contact with the aforementioned underlying dihedron 10, formed by the bottom faces 2b, 3b, 4b of the strips 2, 3 and 4.
  • This active surface is preferably knurled. to optimize the rotational drive of the roller 15.
  • this support roller 15 is rotated about its axis 15a by the friction, on its periphery, of the bottom surface 2b, 3b, 4b of the different strips 2, 3, 4, themselves. driven by the motorized pulley 5.
  • a drive of the motorized pulley 5 in the clockwise direction, according to the orientation arrow 16 ensures the driving of the strips 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 rotate here in a clockwise direction, driven by said strips 2, 3 and 4, and the support roller 15 also rotates clockwise, as illustrated by the orientation arrow 19.
  • the sharpening wedge 9 comprises a median plane P on either side of which are disposed the return pulleys 6, 7 and in which the axis 15a of the support roller 15 and the axis 5 'of the driving pulley 5. This sharpening wedge 9 is located above the cross line 8, the latter being situated above the underlying dihedron 10, the support roller 15 and the driving pulley 5.
  • the movement of the strips 2 and 3, 4 allows an operator to perform the sharpening of a tool blade placed at the sharpening wedge 9, with its cutting edge bearing against the crossing line 8 of the strips 2, 3 and 4.
  • the cutter "curved" is obtained automatically because of the alternating variations of the positioning of the plane of the active surface 2a, 3a, 4a of the strips 2 and 3, 4, thanks to the rotation of the off-axis roller 15.
  • the alternative displacement of the plane of the strips 2, 3, 4 at the sharpening wedge 9, and therefore the variation of the angle of the sharpening wedge 9, can be adapted according to the result that is desired, in particularly by modifying the dimensional characteristics of the support means 15 and / or their positioning.
  • the decentering of the axis 15a of the support roller 15 relative to the axis of its cylindrical active surface 15b may be a few tenths of a millimeter, for example of the order of 0.2 to 1 mm, for a support roller 15 having a diameter of 42 mm, a drive pulley 5 having a diameter of 100 mm and return pulleys 6, 7 having a diameter of 33 mm.
  • the value of the alternative angular variation sought for the sharpening wedge 9 can be determined by adjusting the position of the support roller 15 in the plane or substantially in the plane of said sharpening wedge 9.
  • the corresponding adjustment means may consist of an elongated slot, formed perpendicularly to the axis of the support roller 15, in the plane or substantially in the median plane P of the dihedron 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 locking system of the screw-nut type).
  • the bearing means 15 in combination with the driving characteristics of the strips 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.
  • the supporting frame 1 1 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 two side sides 21 extend upwards. connected 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 to support the axes of the two return pulleys 6 and 7, and the axis of the support roller 15, which extend cantilever from one of its faces; its opposite face serves as support slides 14 guiding the carriage 13 ( Figure 2).
  • This support plate 22 may comprise the aforementioned elongate light for adjusting the positioning of the support roller 15, the axis of the latter being then equipped with the associated removable locking means (for example in the form of screw-nut system).
  • This support plate 22 also has a median upper opening 23 which does not interfere with the movements of the tool blade that is to be sharpened during its grinding operation, as well as a lower opening 24 for free movement. in translation of the carriage assembly 13 / motorization 12 / pulley 5, along the aforementioned slide system 14.
  • the support plate 22 advantageously extends in a plane inclined forwards when the sharpening device 1 is in position on its table or receiving plate, so that the different strips 2, 3, 4 extend in a direction. parallel inclined plane, in order to improve the ergonomics of sharpening operations.
  • the angle of inclination corresponding to 1 with respect to the vertical, visible in FIG. 5, can be of the order of 25 ° to 45 °.
  • the sharpening device 1 advantageously comprises a peripheral housing adapted to protect its constituent functional elements, as well as the operator responsible for sharpening a tool blade.
  • This peripheral casing includes 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 in FIGS. 1 to 6 to facilitate the understanding of the structure of the sharpening device 1.
  • front and rear housing parts are preferably provided removable.
  • a guide-blade device 26 in the general shape of Vé whose tip is open downwards.
  • an abutment structure 27, section Vee provides protection of the internal mechanics against dust attacks related to sharpening, and against possible blade blows.
  • This abutment structure 27 is preferably made of a non-aggressive material for the blade, for example polypropylene; it can be secured to the rear portion of the protective housing.
  • Fixed disks 28 are positioned at the cantilevered end of the axes of the return pulleys 6 and 7, to protect these pulleys 6 and 7 against the aggressions of the blades being sharpened.
  • the support means 15 may be in a form other than a rotary roller with decentred active surface.
  • these support means 15 may consist of an elongate section roller, for example oval, or alternatively of a structure that is movable in horizontal translation, in reciprocating movements, and whose ends come to bear against the surfaces below 2b; 3b, 4b strips 2; 3, 4 for alternately varying the angle of the sharpening wedge 9.
  • the support means 15 may also be adapted to come into contact with only one of said strips 2, 3, 4, or two of them.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP15732303.1A 2014-05-15 2015-05-13 Schärfungsvorrichtung mit kreuzweise angeordneten schleifbändern Active EP3142830B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1454317A FR3020976B1 (fr) 2014-05-15 2014-05-15 Dispositif d'affutage a bandes abrasives disposees en croix
PCT/FR2015/051266 WO2015173518A1 (fr) 2014-05-15 2015-05-13 Dispositif d'affûtage à bandes abrasives disposées en croix

Publications (3)

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

Family

ID=50976971

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15732303.1A Active EP3142830B1 (de) 2014-05-15 2015-05-13 Schärfungsvorrichtung mit kreuzweise angeordneten schleifbändern

Country Status (3)

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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107052915A (zh) * 2017-01-23 2017-08-18 刘福民 一种砂带电动磨刀器及其设置方法
CN112621498A (zh) * 2020-12-25 2021-04-09 杭州爱科科技股份有限公司 一种砂带磨刀方法及其磨刀装置

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 (ja) * 2006-05-18 2007-11-29 Yoshida Kinzoku Kogyo Kk 刃物研磨装置
DE102008033547A1 (de) 2008-07-17 2010-01-21 Visonn Gmbh & Co. Kg Schleif- und Schärfmaschine für Schneidklingen

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2015173518A1 *

Also Published As

Publication number Publication date
FR3020976B1 (fr) 2016-05-13
EP3142830B1 (de) 2023-12-06
WO2015173518A1 (fr) 2015-11-19
EP3142830C0 (de) 2023-12-06
FR3020976A1 (fr) 2015-11-20

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