EP0682481B1 - Procede de decoupe automatique d'une matiere souple en feuille - Google Patents
Procede de decoupe automatique d'une matiere souple en feuille Download PDFInfo
- Publication number
- EP0682481B1 EP0682481B1 EP94905762A EP94905762A EP0682481B1 EP 0682481 B1 EP0682481 B1 EP 0682481B1 EP 94905762 A EP94905762 A EP 94905762A EP 94905762 A EP94905762 A EP 94905762A EP 0682481 B1 EP0682481 B1 EP 0682481B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- cutting
- run
- rotation
- speed
- 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.)
- Revoked
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Images
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
- B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D5/005—Computer numerical control means
-
- 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
- B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/38—Cutting-out; Stamping-out
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/38—Cutting-out; Stamping-out
- B26F2001/388—Cutting-out; Stamping-out controlling the blade orientation along the cutting path
Definitions
- the present invention relates to an automatic cutting process for a flexible sheet material by controlling the relative displacement between the material and a cutting blade along a cutting path comprising several paths connected together.
- the invention relates to the control of rotation of the cutting blade when passing an angle formed by two consecutive paths of the cutting path.
- One field of application of the invention is that of cutting machines with numerical control used for the cutting of fabrics, felts, leather or others flexible sheet materials in the clothing industry, furniture ...
- the cutting is carried out by means of a vibrating blade carried by a cutting head and moved through the flexible sheet material, the latter being frequently arranged in superimposed sheets forming a mattress.
- the cutting blade is moved within the material along a path cut which reproduces a cut to be made and which is the form of trajectories (portions of straight lines and possibly portions of curves) connected together.
- the blade On each trajectory, the blade is moved while being oriented substantially tangential to the path, with cutting speed and acceleration determined.
- Cutting speed and acceleration are set by the operator or are contained in a command file of a host computer or of a memory of a removable storage medium (cassette, magnetic tape, floppy disk, hard disk, ).
- the cutting blade is initially accelerated, at a predetermined maximum cutting acceleration until reaching (if necessary) a predetermined maximum cutting speed, before being slowed down, if necessary to zero speed, to approach the next trajectory.
- the set speed and acceleration thus determined for describe a trajectory are hereinafter designated by speed and acceleration tangential.
- the rotation time is determined by the time taken for the blade to cover the determined distance before and after the vertex of the angle; so she is very correlated to the tangential acceleration of the blade. Indeed, if the deceleration tangential of the blade before reaching the top of the angle and the acceleration tangential of the blade after passing the vertex are large, the rotation time is small and requires a high speed of rotation. In addition, the rotation time does not not depend on the value of the angle, so the speed of rotation will be as much higher than the angle of rotation of the blade is large. Now, a high speed of rotation generates significant lateral forces on the blade and a deflection of this one. This results in a geometric cutting defect for the plies of material. sheet inside and at the base of the mattress.
- the object of the present invention is to propose a cutting method automatic sheet material in one or more layers whereby the rotation of the cutting blade in the corners is carried out without causing aforementioned drawbacks
- the invention aims to provide a method for rotate the cutting blade while minimizing the risk of bending and breakage and with improved cutting quality and productivity.
- the speed average displacement of the cutting blade along the rotation path is correlated with the average speed of rotation of the blade and the value of the angle, while that the displacement of the cutting blade on the first and / or the second trajectory outside the rotation path is carried out at speeds and acceleration of tangential sections determined for this trajectory or these trajectories. He will be able to be provided that the instantaneous speed of movement of the cutting blade is correlated to the instantaneous speed of rotation of the blade.
- the method is remarkable in that the speed of rotation of the blade is controlled, and is not linked to the tangential speeds and accelerations of the setpoint of the blade on the trajectories.
- the displacement of the blade is carried out with a speed correlated to that of rotation of the blade.
- the length of the blade rotation path is chosen so that minimize lateral forces on the blade during rotation, thus reducing the bending of the blade and obtaining better respect for the geometry, in particular for the tablecloths located below the mattress when cutting is carried out on a plurality of overlapping layers.
- the average speed of rotation is chosen or the operator according to the desired compromise between quality of cut - which presupposes a rather low speed of rotation - and productivity - which supposes a speed rather high-.
- the method according to the invention made it possible to make cuts. including V-shaped notches with very high quality, including in hard materials.
- V-shaped notches require the completion of the blade three successive rotations, in opposite directions, and the method of the prior art does not would not allow, in such a case, to obtain a very clear cut.
- the cutting is carried out by means of a vibrating blade 10 carried for a cutting head 12. This is moved along two of these orthogonal X, Y by compared to a horizontal table 20 carrying a mattress 22 made of sheets supperposées 24 of flexible sheet material.
- the mattress can be kept on the vacuum table.
- the cutting head 12 carries a motor (not shown) which distributes to the blade an alternating vertical vibration movement, and a motor (not shown) which used to orient the blade for rotation about a vertical axis 14.
- the cutting head further includes an actuator (not shown) for lifting the blade 10 above the mattress 22 or lower it inside it.
- the movements of the cutting head in X and Y are controlled by respective motors 32, 34 from signals supplied by a control unit 40.
- the unit 40 may for example consist of a computer.
- the displacements of the cutting head are controlled by the computer 40, to allow cutting of the mattress 22 following a predetermined cutting path. To this end, the path of section is broken down into elementary paths (line segments and possibly portions of curves) connected to each other.
- the speed and acceleration of the blade for its cutting movement along the trajectory are determined by the computer 40.
- the computer 40 also controls the blade drive motors cutting in vibration and rotation, as well as raising and lowering the blade chopped off.
- a difficulty lies in controlling the rotation of the blade around its vertical ce, when passing an angle A between a trajectory T1 and a trajectory T2, so that the blade passes from one orientation tangent to the path T1 to an orientation tangent to the path T2, while respecting the desired geometry for cutting.
- this rotation is carried out at a speed of predetermined mean rotation Vr, over a rotation path of length Dr predetermined located on either side of the vertex of angle A, or on either side else from the top.
- the rotation path is a length segment Dr bounded by the vertex O of angle A and a point B on the T2 path traveled after the T1 path.
- the speed of rotation Vr is chosen so as to achieve a compromise between cutting quality and productivity imperatives.
- the Vr value varies according to the nature and number of the plies 24 constituting the mattress 22.
- the distance Dr is chosen so that, taking into account the speed mean of rotation Vr and of the geometry of the blade (distance l between the wire cutting edge and rear of the blade), the result of the lateral forces exerted on the blade is minimized.
- the elementary paths constituting the cutting path are received (phase 101) and processed (phases 102).
- the angle A between a trajectory T1 and a trajectory T2 i.e. the angle by which the blade must turn to pass from one orientation tangent to T1 to orientation tangent to T2 is compared to a value minimum A1 and a maximum value A 2 (test 103).
- a ⁇ A1 (test 104)
- the rotation is relatively weak and is performed on a distance dr immediately before the vertex of the angle and a distance dr immediately after the top of the angle without changing the setpoints acceleration and cutting speed for the movement of the blade on the T1 and T2 trajectories (phase 105).
- the rotation is therefore carried out according to the method of the prior art mentioned at the head of this description.
- the average speed of rotation is determined according to the known value of the distance dr and the known values of the speed and acceleration of the blade on the trajectories.
- the rotation is very important. It is carried out as soon as the blade finished the trajectory T1 with zero speed, was able to lift the blade out of the material, rotation of the blade and re-introduction of the blade into the material (phase106).
- the values of A1 and A2 can be chosen equal to 10 ° and 120 ° respectively.
- the blade is rotated according to the process according to the invention, that is to say in the example of the FIG. 2A, by termination of the path T1 without rotation of the blade, orientation of the blade at a predetermined average speed of rotation on the path of rotation of length Dr, and termination of the path T2 (distance D2 - Dr) at target tangential speed and acceleration.
- the length D2 of the path T2 is compared to the predetermined value Dr (test 107). If D2 ⁇ Dr, then the Dr value is modified to be at most equal to D2, for example less than D2 by 1 / 10mm (phase 108). The remaining 1 / 10mm is performed at setpoint acceleration and tangential speed, before a new blade rotation. The goal is to complete the rotation course characterized by control the speed of rotation and resume normal travel.
- Tr is less than a minimum value Tr1 (test 110)
- the value of Vr is decreased to be equal to A / Tr1 (phase 111).
- the duration Tr which represents also the time taken by the blade to cover the distance Dr should not be too much small at the risk of imposing too much acceleration on the cutting head the blade reaches the end of the rotation path at the same time as the rotation ends.
- the law of acceleration and speed of movement of the blade as a function of time on the rotation path is determined as a function of the average speed Dr / Tr, and taking into account the maximum acceptable acceleration and speed (phase 112). It can be made so that the instantaneous speed of movement of the cutting blade on the rotation path is correlated with the instantaneous speed of rotation.
- the rest of the path T2 is then completed (phase 118) by taking counts the tangential speed and acceleration setpoints, predetermined for the distance D2-Dr.
- the rotation path of length Dr is placed at the start of the T2 trajectory. It is alternatively possible to place it at the end of the trajectory T1 (figure 2B) or on either side of the vertex of angle A (figure 2C).
- the rotation path begins or ends at vertex of the angle, or includes it.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Cutting Processes (AREA)
- Treatment Of Fiber Materials (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
Description
- la découpe est réalisée par commande automatique du déplacement relatif entre la matière et la lame de coupe le long du chemin de coupe, en fonction de vitesse et d'accélération tangentielles de consigne déterminées sur chaque trajectoire,
- au passage d'un angle raccordant une première trajectoire à une deuxième
trajectoire, une rotation de la lame de coupe est commandée pendant son
déplacement au sein de la matière pour passer automatiquement d'une première
orientation dans laquelle la lame est sensiblement tangente à la première trajectoire
à une deuxième orientation dans laquelle la lame est sensiblement tangente à la
deuxième trajectoire,
procédé dans lequel, selon l'invention : - la rotation de la lame est accomplie à une vitesse moyenne de rotation prédéterminée sur un parcours de rotation constitué pu une partie de longueur prédéterminée de la première trajectoire et/ou de la deuxième trajectoire qui se termine ou comment au sommet de l'angle ou inclut celui-ci.
- la figure 1 est un diagramme illustrant très schématiquement une installation de découpe dans laquelle un procédé selon l'invention peut être mis en oeuvre,
- les figures 2A, 2B et 2C montrent de façon très schématique des positions prises pu la lame lors de sa rotation au passage d'un angle raccordant deux trajectoires consécutives d'un chemin de coupe, et
- la figure 3 est un organigramme montrant les étapes successives de la commande de la rotation d'une lame de coupe, selon un mode de mise en oeuvre de l'invention.
Claims (8)
- Procédé de découpe automatique d'une matière souple en feuille (22) le long d'un chemin de coupe comprenant plusieurs trajectoire (T1, T2) raccordées entre elles, procédé selon lequel :la découpe est réalisée par commande automatique du déplacement relatif entre une lame de coupe (10) et la matière (22) le long du chemin de coupe, en fonction de vitesse et d'accélération tangentielles de consigne déterminées sur chaque trajectoire,au passage d'un angle (A) raccordant une première trajectoire (T1) à une deuxième trajectoire (T2), une rotation de la lame de coupe est commandée (12) pendant son déplacement au sein de la matière pour passer automatiquement d'une première orientation dans laquelle la lame est sensiblement tangente à la première trajectoire à une deuxième orientation dans laquelle la lame est sensiblement tangente à la deuxième trajectoire,
caractérisé en ce que :sur un parcours de rotation constitué par une partie de longueur prédéterminée de la première trajectoire et/ou de la deuxième trajectoire qui se termine ou commence au sommet de l'angle ou inclut celui-ci, la commande du déplacement de la lame à partir des vitesses et accélération tangentielles de consigne est inhibée et la rotation de la lame est accomplie à une vitesse moyenne de rotation prédéterminée. - Procédé selon la revendication 1, caractérisé en ce que la vitesse moyenne de déplacement de la lame de coupe le long du parcours de rotation est corrélée à la vitesse moyenne de rotation de la lame et à la valeur de l'angle, tandis que le déplacement de la lame de coupe sur la première et/ou la deuxième trajectoire hors du parcours de rotation est effectué à des vitesse et accélération de coupe tangentielles déterminées pour cette trajectoire ou ces trajectoires.
- Procédé selon l'une quelconque des revendications 1 et 2, caractérisé en ce que la vitesse instantanée de déplacement le long du parcours de rotation est corrélée à la vitesse instantanée de rotation, tandis que le déplacement de la lame de coupe sur la première et/ou la deuxième trajectoire hors du parcours de rotation est effectué à des vitesse et accélération de coupe tangentielles déterminées pour cette trajectoire ou ces trajectoires.
- Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la rotation de la lame de coupe est effectuée sur un parcours de rotation constitué par une partie de longueur prédéterminée au début de la deuxième trajectoire.
- Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'il est mis en oeuvre lorsque l'angle entre la première et la deuxième trajectoire est au plus égal à une valeur maximale prédéterminée au-delà de laquelle la rotation de la lame est effectuée, à la fin de la première trajectoire, hors de la matière.
- Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'il est mis en oeuvre lorsque l'angle entre la première et la deuxième trajectoire est au moins égal à une valeur minimale prédéterminée en-deçà de laquelle la rotation de la lame est effectuée au sein de la matière, sur une distance prédéterminée de part et d'autre du sommet de l'angle, pendant le déplacement de la lame de coupe aux vitesses et accélérations tangentielles de consigne déterminées pour la première et la deuxième trajectoire.
- Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que, lorsque le parcours de rotation a une longueur supérieure à celle de la trajectoire sur laquelle il est situé, la longueur du parcours de rotation est réduite pour se terminer au plus à l'extrémité de la trajectoire.
- Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'il comprend le calcul de la durée de rotation en fonction de la valeur de l'angle et de la valeur de la vitesse moyenne de rotation prédéterminée, et le choix d'une nouvelle valeur de la vitesse moyenne de rotation inférieure à la valeur prédéterminée, lorsque le temps de rotation est inférieur à un seuil minimum prédéterminé.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9301359A FR2701229B1 (fr) | 1993-02-08 | 1993-02-08 | Procédé de découpe automatique d'une matière souple en feuille. |
FR9301359 | 1993-02-08 | ||
PCT/FR1994/000117 WO1994017683A1 (fr) | 1993-02-08 | 1994-01-31 | Procede de decoupe automatique d'une matiere souple en feuille |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0682481A1 EP0682481A1 (fr) | 1995-11-22 |
EP0682481B1 true EP0682481B1 (fr) | 1998-08-12 |
Family
ID=9443834
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94905762A Revoked EP0682481B1 (fr) | 1993-02-08 | 1994-01-31 | Procede de decoupe automatique d'une matiere souple en feuille |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0682481B1 (fr) |
JP (1) | JPH08506767A (fr) |
DE (1) | DE69412460T2 (fr) |
ES (1) | ES2121188T3 (fr) |
FR (1) | FR2701229B1 (fr) |
WO (1) | WO1994017683A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19548304C2 (de) * | 1995-12-22 | 1997-09-25 | Wolfgang Dipl Ing Bruder | Schneidvorrichtung für flächige, biegeschlaffe Gebilde, wie z. B. für Lederhäute oder Textilbahnen |
CN108716096A (zh) * | 2018-06-22 | 2018-10-30 | 池州市达宏信息技术有限公司 | 一种plm服装加工设计裁剪设备 |
JP7476636B2 (ja) * | 2020-04-14 | 2024-05-01 | 株式会社リコー | 切断装置、後処理装置、及び画像形成システム |
CN111501314B (zh) * | 2020-04-24 | 2021-06-08 | 安徽恒益纺织科技有限公司 | 一种服装面料裁剪用画线装置及其画线方法 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3587381A (en) * | 1968-05-06 | 1971-06-28 | Cincinnati Milacron Inc | Material cutting machine having reciprocating cutting blade adapted to enter material without an entrance cut |
US3766813A (en) * | 1971-08-05 | 1973-10-23 | Gerber Garment Technology Inc | Methods for cutting sharp corners and notches in layups of fabric and other sheet material |
GB1365188A (en) * | 1971-09-23 | 1974-08-29 | Gerber Garment Technology Inc | Method for cutting sheet material and generating related conrol ler commands |
JPS5112120A (ja) * | 1974-07-20 | 1976-01-30 | Nippon Electric Co | Jikiteepuseigyosochi |
US4178820A (en) * | 1977-04-22 | 1979-12-18 | Gerber Garment Technology, | Method and apparatus for cutting sheet material with improved accuracy |
JPS5621558A (en) * | 1979-07-26 | 1981-02-28 | Arai Kikai Seisakusho:Kk | Seasoning apparatus for japanese cracker |
-
1993
- 1993-02-08 FR FR9301359A patent/FR2701229B1/fr not_active Expired - Fee Related
-
1994
- 1994-01-31 ES ES94905762T patent/ES2121188T3/es not_active Expired - Lifetime
- 1994-01-31 DE DE69412460T patent/DE69412460T2/de not_active Revoked
- 1994-01-31 WO PCT/FR1994/000117 patent/WO1994017683A1/fr not_active Application Discontinuation
- 1994-01-31 JP JP6517710A patent/JPH08506767A/ja active Pending
- 1994-01-31 EP EP94905762A patent/EP0682481B1/fr not_active Revoked
Also Published As
Publication number | Publication date |
---|---|
ES2121188T3 (es) | 1998-11-16 |
WO1994017683A1 (fr) | 1994-08-18 |
EP0682481A1 (fr) | 1995-11-22 |
JPH08506767A (ja) | 1996-07-23 |
DE69412460T2 (de) | 1999-01-28 |
FR2701229A1 (fr) | 1994-08-12 |
DE69412460D1 (de) | 1998-09-17 |
FR2701229B1 (fr) | 1995-04-28 |
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