EP0418163A1 - Verfahren und Vorrichtung zum automatischen Schleifen von Schneidmessern - Google Patents

Verfahren und Vorrichtung zum automatischen Schleifen von Schneidmessern Download PDF

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Publication number
EP0418163A1
EP0418163A1 EP90402533A EP90402533A EP0418163A1 EP 0418163 A1 EP0418163 A1 EP 0418163A1 EP 90402533 A EP90402533 A EP 90402533A EP 90402533 A EP90402533 A EP 90402533A EP 0418163 A1 EP0418163 A1 EP 0418163A1
Authority
EP
European Patent Office
Prior art keywords
blade
grinding wheel
sharpening
wire
axis
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
EP90402533A
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English (en)
French (fr)
Other versions
EP0418163B1 (de
Inventor
Jean Etcheparre
Bernard Etcheparre
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.)
Lectra SA
Original Assignee
Lectra Systemes SA
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Filing date
Publication date
Application filed by Lectra Systemes SA filed Critical Lectra Systemes SA
Publication of EP0418163A1 publication Critical patent/EP0418163A1/de
Application granted granted Critical
Publication of EP0418163B1 publication Critical patent/EP0418163B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/08—Means for treating work or cutting member to facilitate cutting
    • B26D7/12—Means for treating work or cutting member to facilitate cutting by sharpening the cutting member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/36—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades
    • B24B3/361—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades of reciprocating blades

Definitions

  • the cutting head generally consists of a mechanism making it possible to vibrate a sharp blade vertically, which mechanism can move up and down so as to make the blade penetrate or disengage at the desired location in the mattress.
  • the blade can rotate around its vertical axis. The rotation is controlled so that the blade always remains correctly oriented relative to the path. In order for the blade to cut all the folds of the mattress, it is necessary for the blade to enter the cutting table, which therefore has a coating for this purpose.
  • the sharpening device for an elongated cutting blade having a cutting edge is characterized in that it comprises a grinding wheel provided at least with an area of abrasive material, said grinding wheel having a cylindrical body provided with a peripheral groove V-shaped, said grinding wheel being mounted in free rotation about an axis TT contained in a plane generally parallel to the edge of the blade and perpendicular to the median plane CXZ of the blade, and said axis inclined by a predetermined angle P by with respect to the normal CY to the median plane of the blade, said sharpening device further comprising means for bringing the blade and the grinding wheel into contact and means for relative displacement of the blade and the grinding wheel in a parallel direction over the blade.
  • the first consists in keeping the blade fixed, in the high position, and in moving the grinding wheel, first of all in a horizontal movement to come into contact with the blade and then in a vertical movement to move it along the cutting edge of the blade.
  • An automatic cycle can be carried out allowing several passes until the correct sharpening is obtained.
  • the second way is, unlike the first, to keep the wheel fixed in height and to move the blade in front of the wheel. The displacement of the blade can result in particular from the longitudinal vibration of the latter.
  • This solution has the advantage of simplifying the sharpening device by eliminating the need for a member intended to produce the vertical movement of the grinding wheel relative to the blade. Either solution will be chosen based on the design of the entire cutting head.
  • the sharpening is done according to the following principle: the cutting edge of the blade is brought into contact with the outer edges of the groove of the grinding wheel. Due to the inclination of the grinding wheel, the contacts are made on the two opposite sides of the blade. The relative movement between the blade and the grinding wheel creates, by friction, the rotation of the grinding wheel. The abrasive grains of the grinding wheel then machine the blade according to inclined trajectories relative to the cutting wire from where the sharpening. As the sharpening progresses, the blade wears out and progresses towards the inside of the groove of the grinding wheel.
  • the blade performs a rotation around its vertical axis imposed by the blade holder block so that one cannot predict in advance the direction of the cutting edge of the blade at the time of sharpening ; it is therefore necessary to each sharpening to correct the position of the grinding wheel compared to that of the blade.
  • the present invention also aims to solve this problem by imposing on the grinding wheel the same rotational movements as the blade and simultaneously.
  • This object is achieved according to the invention by a grinding wheel fixed by means of a horizontal axis on a plate integral in rotation with the blade holder block so that the groove of the grinding wheel is constantly facing the cutting edge of the blade.
  • the cutting machine illustrated in Figure 1 comprises a fixed table 10, arranged on a frame not shown, and intended to receive sheet materials, or mattress 12, for their cutting along a predetermined path.
  • a beam 14 mounted in longitudinal displacement on the table 10, and driven by means not shown, in the right-left direction in Figure 1 symbolized by the arrow L.
  • a carriage 16 On the beam 14 is mounted a carriage 16 which moves along the beam, using means not shown, in transverse direction relative to the table, in the front-rear direction in Figure 1, the direction right-left in FIG. 2, symbolized by the arrow T.
  • a block 18 blade holder is mounted laterally on the carriage 16, by means of vertical movement paths 20, so as to be able to move vertically on the carriage, therefore relative to the table 10, as illustrated by the arrow H in the figure, by drive means not shown.
  • the blade-holding block contains a gripping member 21 for a vertical cutting blade 22, means for imparting to the blade a vibratory movement in the vertical direction symbolized by the double arrow W, and means for imparting to the blade a movement of rotation around a vertical axis Eraser symbolized by the arrow R.
  • This rotation of the blade is to constantly keep the blade wire oriented along the tangent to the path imposed by the longitudinal and transverse drive members associated with the beam 14 and the carriage 16 respectively.
  • the upper face of the table is lined with a layer 24 of flexible and penetratable material, for example a brush mat, which the tip of the blade 22 can penetrate in order to allow the cutting of the mattress 12 over its entire thickness.
  • a layer 24 of flexible and penetratable material for example a brush mat
  • a presser foot 26 movable vertically between a raised position, illustrated in dotted lines, at a certain distance from the table 10 to allow the placement or removal of material 12 on the table 10, and a position lowered in contact with the material placed on the table.
  • This presser foot 26 has a dual function.
  • the first function is to press the mattress 12 around the blade 22 to prevent the mattress from following the vertical vibration movements of the blade.
  • the second function is to correctly guide the blade 22 as close as possible to the mattress 12 so as to avoid bending of the blade 22 due to the horizontal cutting forces.
  • a sharpening device 30 constituted as follows:
  • a plate 32 is fixed to the carriage 16 on one side of the blade 22.
  • a sharpening wheel 34 is mounted so that it can move opposite the blade 22 and can be moved away from or closer to the latter by means of a drive member, for example a cylinder 36 as shown.
  • two grinding wheels 34, 35 are provided, arranged one above the other and mounted idly on a lifting beam 38 at the end of the jack rod 36 in order to ensure that the grinding wheels 34, 35 are both correctly in contact with the blade 22.
  • the plate 32 and the jack 35 for moving the grinding wheels 34, 35 are mounted movable along vertical guides 40 of the carriage 16, under the control of a motor member, for example also a jack 42.
  • FIG. 2 it may be a simple abutment with a flat surface made of wear-resistant material, against which the edge of the blade 22 opposite the wire 23 slides during sharpening.
  • this stop may be produced in the form of a ungalet.
  • each wheel 34, 35 has the shape of a flattened cylinder and has a groove 46 in V at its periphery.
  • EHe is mounted so that its TT axis is inclined relative to the horizontal.
  • the grinding wheel 34, 35 is produced so as to comprise abrasive grains at least on the surface at the level of the external edges of the groove 46. To do this, it is possible either to produce a grinding wheel in a material containing abrasive grains in a binder, or fix by any suitable method a coating containing abrasive grains on the surface of a blank of non-abrasive material.
  • the blade 22 and of the grinding wheel 34, 35 Thanks to the relative vertical movement of the blade 22 and of the grinding wheel 34, 35, the latter is rotated and exerts on the blade a machining by the abrasive grains at the contact zones following inclined paths relative to the wire 23 which achieves sharpening.
  • point C corresponds to the center of the grinding wheel;
  • the axis CX is the horizontal axis which intersects the bottom groove circle 46 and the wire 23 of the blade at a point D,
  • the axis CY is the horizontal axis perpendicular to the previous one;
  • the CZ axis is the vertical axis passing through the center C; the plane CXZ therefore representing the median plane of the blade 22.
  • the axis TT of the grinding wheel 34 is contained in the plane CYZ and forms an angle P with the axis CY.
  • the V-shaped groove defines a circle 52 at the bottom of the groove of radius Ri and two circular edges 54, 56 of radius R and spaced a distance a, the wire 23 of the blade 22 making contact with both edges at two points B and B 'vertically distant by a distance e.
  • Point B projects onto the axis CZ at a point A distant from the center C by a distance e / 2 and on the axis TT at a point G distant from the center C by a distance a / 2.
  • the truncated cone defining the groove wall on which the point B is located has a point E on the axis TT on the vertex, at a distance b from the center C.
  • This point E is projected in a horizontal plane containing the line AB at a point F.
  • the point H is located at the intersection of the generator EB and the circle 52 at the bottom of the groove and the point J is the projection of the point H on the segment BF.
  • Q is called the half-angle of opening of the groove 46, Xt the horizontal distance between the axis CE and the wire 23 of the blade; Ri the radius of the circle 52 at the bottom of the groove; Qa the apparent half-angle of the groove 46 of the grinding wheel, seen vertically by the blade 22; and N is the half cutting angle of the blade 22.
  • the advantage of having two or more grinding wheels in the direction of the thread is to allow sharpening over a sufficient length while reducing the amplitude of the relative movement of the blade.
  • FIGS. 8 to 10 show another embodiment of the invention in which the blade holder block 18 is made integral in movement with the grinding wheel 34.
  • the grinding wheel 34 (or the grinding wheels mounted in series on the lifter 38) is fixed to the plate 52 by means of a horizontal axis 54; in addition, this plate 52 has a device for guiding the blade 22 and carries the presser foot 26 which can be actuated by means of a jack 58.
  • the plate 52 is driven by the same rotational movement as that imposed by the blade holder block 18 on the blade 22 and thus drives in this movement the sharpening system.
  • the groove of the grinding wheel 34 is therefore constantly facing the cutting edge of the blade.
  • the presser foot 26 rises against the plate 52 thanks to the jack 58, which requires the cam 60 to compress the return spring 62 located on the guide 54.
  • the sharpening system in this way is positioned correctly facing the edge of the blade. The sharpening can then take place in the position shown in FIG. 10.
  • the sharpening process takes place in the following manner: the blade 22 is placed in the high position and is then automatically oriented with its cutting wire facing the groove of the grinding wheel.
  • the grinding wheel 34 is automatically arranged by slaving the rotation of the grinding wheel to that of the blade as shown in FIG. 9.
  • the blade 22 is then vibrated in exactly the same way as during cutting; the grinding wheel 34 is then brought in a horizontal movement into contact with the blade, and is kept in this arrangement for a very short time.
  • the sharpening is done according to this method with the blade in the high position, we can therefore take advantage of the dead times of the cut (for example during the movement between two pieces), where the blade is necessarily in the high position to perform the sharpening .
  • the sharpening is thus in "masked time", which avoids loss of time and optimizes the speed of the machine.
  • W be the longitudinal vibration amplitude of the blade.
  • Each contact point (B and B ') sharpens on both sides of the blade a length equal to W.
  • the parameter e can be adapted so as to obtain the desired length of sharpened blade.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Nonmetal Cutting Devices (AREA)
EP90402533A 1989-09-15 1990-09-14 Verfahren und Vorrichtung zum automatischen Schleifen von Schneidmessern Expired - Lifetime EP0418163B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8912147A FR2652029B1 (fr) 1989-09-15 1989-09-15 Methode et dispositif d'affutage automatique pour des lames coupe telles que celles utilisees dans les machines de coupe automatiques.
FR8912147 1989-09-15

Publications (2)

Publication Number Publication Date
EP0418163A1 true EP0418163A1 (de) 1991-03-20
EP0418163B1 EP0418163B1 (de) 1994-07-06

Family

ID=9385549

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90402533A Expired - Lifetime EP0418163B1 (de) 1989-09-15 1990-09-14 Verfahren und Vorrichtung zum automatischen Schleifen von Schneidmessern

Country Status (7)

Country Link
EP (1) EP0418163B1 (de)
JP (1) JPH03104599A (de)
AT (1) ATE108113T1 (de)
CA (1) CA2024668A1 (de)
DE (1) DE69010435T2 (de)
ES (1) ES2058848T3 (de)
FR (1) FR2652029B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2695056A1 (fr) * 1992-08-31 1994-03-04 Lectra Systemes Sa Lame pour découpeur et procédé de découpe mettant en Óoeuvre une telle lame.
CN110539214A (zh) * 2019-09-27 2019-12-06 王清 一种可转位刀片自动转角侧压治具
CN111730670A (zh) * 2020-07-02 2020-10-02 王世恭 一种高效型的切丁机
CN113106729A (zh) * 2021-03-04 2021-07-13 孟晓飞 一种布料裁剪用刀具固定装置
FR3132040A1 (fr) * 2022-01-27 2023-07-28 Lectra Procédé de pilotage automatique d’un déclenchement d’un affûtage du fil tranchant d’une lame de coupe pour machine de coupe

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101374642B (zh) * 2006-01-24 2010-08-04 株式会社岛精机制作所 自动裁剪装置的裁剪刀的研磨装置
ITFI20130292A1 (it) * 2013-11-30 2015-05-31 Futura Spa Dispositivo per il controllo dell'affilatura di lame a nastro.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2033939A (en) * 1933-07-24 1936-03-17 Chicago Flexible Shaft Co Portable electric cutting machine
US2171604A (en) * 1936-06-18 1939-09-05 Segal Samuel Cloth-cutting machine
US2236038A (en) * 1938-08-05 1941-03-25 Silberstang Jacob Honing or sharpening device for cloth cutting machines
FR1016574A (fr) * 1950-04-21 1952-11-17 Agile Soc Affûteur de couteau droit, notamment destiné aux coupeuses électriques pour tissus
US3233371A (en) * 1963-08-12 1966-02-08 Wolf Machine Company Sharpening device for a cloth cutting machine
US3821915A (en) * 1972-07-11 1974-07-02 Paper Pak Prod Inc Fiber cutting apparatus with self-contained blade sharpener

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2033939A (en) * 1933-07-24 1936-03-17 Chicago Flexible Shaft Co Portable electric cutting machine
US2171604A (en) * 1936-06-18 1939-09-05 Segal Samuel Cloth-cutting machine
US2236038A (en) * 1938-08-05 1941-03-25 Silberstang Jacob Honing or sharpening device for cloth cutting machines
FR1016574A (fr) * 1950-04-21 1952-11-17 Agile Soc Affûteur de couteau droit, notamment destiné aux coupeuses électriques pour tissus
US3233371A (en) * 1963-08-12 1966-02-08 Wolf Machine Company Sharpening device for a cloth cutting machine
US3821915A (en) * 1972-07-11 1974-07-02 Paper Pak Prod Inc Fiber cutting apparatus with self-contained blade sharpener

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2695056A1 (fr) * 1992-08-31 1994-03-04 Lectra Systemes Sa Lame pour découpeur et procédé de découpe mettant en Óoeuvre une telle lame.
CN110539214A (zh) * 2019-09-27 2019-12-06 王清 一种可转位刀片自动转角侧压治具
CN110539214B (zh) * 2019-09-27 2024-06-04 王清 一种可转位刀片自动转角侧压治具
CN111730670A (zh) * 2020-07-02 2020-10-02 王世恭 一种高效型的切丁机
CN113106729A (zh) * 2021-03-04 2021-07-13 孟晓飞 一种布料裁剪用刀具固定装置
CN113106729B (zh) * 2021-03-04 2022-12-16 广东宏健医疗器械有限公司 一种布料裁剪用刀具固定装置
FR3132040A1 (fr) * 2022-01-27 2023-07-28 Lectra Procédé de pilotage automatique d’un déclenchement d’un affûtage du fil tranchant d’une lame de coupe pour machine de coupe
WO2023144490A1 (fr) * 2022-01-27 2023-08-03 Lectra Procédé de pilotage automatique d'un déclenchement d'un affûtage du fil tranchant d'une lame de coupe pour machine de coupe

Also Published As

Publication number Publication date
DE69010435T2 (de) 1995-01-05
JPH03104599A (ja) 1991-05-01
ATE108113T1 (de) 1994-07-15
CA2024668A1 (en) 1991-03-16
FR2652029B1 (fr) 1995-01-27
EP0418163B1 (de) 1994-07-06
FR2652029A1 (fr) 1991-03-22
DE69010435D1 (de) 1994-08-11
ES2058848T3 (es) 1994-11-01

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