EP0682481A1 - Method for automatically cutting a flexible sheet material - Google Patents
Method for automatically cutting a flexible sheet materialInfo
- Publication number
- EP0682481A1 EP0682481A1 EP94905762A EP94905762A EP0682481A1 EP 0682481 A1 EP0682481 A1 EP 0682481A1 EP 94905762 A EP94905762 A EP 94905762A EP 94905762 A EP94905762 A EP 94905762A EP 0682481 A1 EP0682481 A1 EP 0682481A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotation
- blade
- trajectory
- cutting
- path
- 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
Links
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 flexible sheet material by controlling the relative movement between the material and a cutting blade along a cutting path comprising several paths connected together.
- the invention relates to the control of the rotation of the cutting blade when passing an angle formed by two consecutive trajectories of the cutting path.
- One field of application of the invention is that of numerically controlled cutting machines used for cutting fabrics, felts, leather or other flexible sheet materials in the clothing industry, furniture ... these machines, 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 overlapping plies forming a mattress.
- the cutting blade is moved within the material along a cutting path which reproduces a cut to be made and which is formed of paths (portions of straight lines and possibly portions of curves) connected together.
- the blade On each trajectory, the blade is moved while being oriented substantially tangentially to the trajectory, with a determined speed and acceleration of cutting.
- the cutting speed and acceleration are set by the operator or are contained in a command file of a host computer or in 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 (possibly) a predetermined maximum cutting speed, before being slowed down, if necessary to a speed zero, to approach the next trajectory.
- the setpoint speed and acceleration thus determined to describe a trajectory are hereinafter referred to as tangential speed and acceleration.
- the duration of rotation is determined by the time taken by the blade to travel the determined distance before and after the top of the angle; it is therefore highly correlated to the tangential acceleration of the blade. Indeed, if the tangential deceleration of the blade before reaching the top of the angle and the tangential acceleration of the blade after passing from the top are large, the rotation time is small and imposes a high speed of rotation. In addition, the duration of rotation does not depend on the value of the angle, so that the speed of rotation will be higher the greater the angle of rotation of the blade. However, a high speed of rotation generates significant lateral forces on the blade and a deflection thereof. This results in a geometric cutting defect for the sheets of sheet material inside and at the base of the mattress.
- the object of the present invention is to propose an automatic method for cutting a sheet material into one or more layers by means of which the rotation of the cutting blade in the corners is carried out without causing the aforementioned drawbacks.
- the object of the invention is to propose a method enabling the cutting blade to be rotated while minimizing the risks of bending and breakage and with improved cutting quality and productivity.
- the cutting is carried out by automatic control of the relative displacement between the material and the cutting blade along the cutting path, as a function of the tangential speed and tangential acceleration of the setpoint determined on each trajectory,
- a rotation of the cutting blade is controlled during its movement within the material to automatically pass from a first orientation in which the blade is substantially tangent to the first trajectory to a second orientation in which the blade is substantially tangent to the second trajectory, method in which, according to the invention:
- the rotation of the blade is carried out at a predetermined average speed of rotation over a rotation path consisting of a portion of predetermined length of the first trajectory and / or of the second trajectory which ends or begins at the top of the angle, or includes this one.
- the average speed of movement 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 the displacement of the cutting blade on the first and / or the second trajectory outside the rotation path is carried out at tangential cutting speed and acceleration determined for this trajectory or these trajectories. Provision may be made for the instantaneous speed of movement of the cutting blade to be correlated with 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 blade setpoint on the trajectories.
- the blade On the rotation path, the blade is moved with a speed correlated to that of the blade rotation.
- the length of the blade rotation path is chosen so as to minimize the lateral forces on the blade during rotation, therefore to reduce the flexion of the blade and obtain better respect for the geometry, in particular for the plies located below of the mattress when cutting is carried out on a plurality of overlapping layers.
- the average speed of rotation is chosen by the operator according to the desired compromise between quality of cut - which assumes a rather low speed of rotation - and productivity - which supposes a rather high speed -. It is possible to describe large angles without having to lift the cutting blade, thereby improving productivity.
- V-shaped notches require the blade to perform three successive rotations, in opposite directions, and the method of the prior art would not, in such a case, allow a clear cut to be obtained.
- FIG. 1 is a diagram very schematically illustrating a cutting installation in which a method according to the invention can be implemented
- FIGS. 2A, 2B and 2C very schematically show positions taken by the blade during its rotation when passing an angle connecting two consecutive trajectories of a cutting path
- FIG. 3 is a flowchart showing the successive steps of controlling the rotation of a cutting blade, according to an embodiment of the invention.
- Automatic cutting machines with numerical control allowing the cutting of a flexible material in sheet, in particular of several superposed layers of such a material, along a predetermined cutting path, are known, in particular in the field of confection.
- the cutting is carried out by means of a vibrating blade 10 carried by a cutting head 12.
- the latter is moved along two orthogonal axes X, Y with respect to a horizontal table 20 carrying a mattress 22 made up of plies supperposées 24 of flexible sheet material.
- the mattress can be kept on the table by suction.
- the cutting head 12 carries a motor (not shown) which gives the blade an alternating vertical vibration movement, and a motor (not shown) which makes it possible to orient the blade by rotation about a vertical axis 14.
- the head cutting further comprises an actuator (not shown) for lifting the blade 10 above the mattress 22 or lower it inside thereof.
- the displacements of the cutting head in X and in 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 movements of the cutting head are controlled by the computer 40, to allow the cutting of the mattress 22 along a predetermined cutting path. To this end, the cutting path is broken down into elementary paths (line segments and possibly portions of curves) connected to each other. For each trajectory, 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 motors for driving the cutting blade in vibration and in rotation , as well as raising and lowering the cutting blade.
- a machine as succinctly described above is well known to those skilled in the art so that a more detailed description is not necessary.
- a difficulty lies in controlling the rotation of the blade around its vertical axis, when passing an angle A between a trajectory T1 and a trajectory T2, in order to ensure that the blade passes from 'an orientation tangent to the path T1 to an orientation tangent to the path T2, while respecting the geometry desired for cutting.
- this rotation is carried out at a predetermined average rotation speed Vr, on a rotation path of predetermined length Dr located on one side or the other of the vertex of the angle A, or on both sides. else from the top.
- the rotation path is a segment of length Dr bounded by the vertex O of the angle A and a point B on the path T2 traversed after the path Tl.
- the speed of rotation Vr is chosen so as to achieve a compromise between imperatives of cutting quality and productivity.
- the value Vr varies according to the nature and the number of plies 24 constituting the mattress 22.
- the distance Dr is chosen so that, taking into account the average speed of rotation Vr and the geometry of the blade (distance 1 between the cutting edge and the rear of the blade), the result of the lateral forces exerted on the blade is minimized.
- phase 101 and processed (phases 102).
- the angle A between a trajectory Tl and a trajectory T2 (that is to say the angle whose blade must turn to pass from an orientation tangent to Tl to an orientation tangent to T2) is compared with a minimum value Al and a maximum value A 2 (test 103). If A ⁇ A1 (test 104), the rotation is relatively weak and is accomplished over a distance dr immediately before the vertex of the angle and a distance dr immediately after the vertex of the angle without modifying the acceleration and cutting speed for moving the blade on the paths T1 and T2 (phase 105). The rotation is therefore carried out according to the method of the prior art mentioned at the beginning of this description.
- the average speed of rotation is determined as a function of the known value of the distance dr and of 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 has finished the trajectory T1 with zero speed, by lifting the blade out of the material, rotation of the blade and re-introduction of the blade into the material (phase 106).
- the values of Al and A2 can be chosen equal to 10 * and 120 * respectively.
- the blade is rotated according to the method according to the invention, that is to say, in the example of FIG. 2A, by termination of the trajectory T1 without rotation of the blade, orientation of the blade at a predetermined average speed of rotation on the course of rotation of length Dr, and termination of the trajectory T2 (distance D2 - Dr) at the set 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 value Dr is modified to be at most equal to D2, for example less than D2 by 1 / 10mm (phase 108). The remaining 1/10 mm is made at the set acceleration and tangential speed, before a further rotation of the blade. The goal is to complete the rotation course characterized by controlling the speed of rotation and to resume the normal movement regime.
- the blade rotation time Tr is calculated (phase 109) by performing
- Tr A / Vr.
- Tr is less than a minimum value Tri (test 110)
- the value of Vr is reduced to be equal to A / Trl (phase 111).
- the duration Tr which also represents the time taken by the blade to cover the distance Dr, must not be too small at the risk of imposing on the cutting head an acceleration that is too great for the blade to reach 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 over 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) taking into account the tangential speed and acceleration instructions, predetermined for the distance D2-Dr.
- the rotation path of length Dr is placed at the start of the path T2. It is possible, as a variant, to place it at the end of the trajectory Tl (FIG. 2B) or on either side of the vertex of the angle A (FIG. 2.
- the rotation path begins, ends at, or includes the top of the angle.
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)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9301359 | 1993-02-08 | ||
FR9301359A FR2701229B1 (en) | 1993-02-08 | 1993-02-08 | Process for automatic cutting of flexible sheet material. |
PCT/FR1994/000117 WO1994017683A1 (en) | 1993-02-08 | 1994-01-31 | Method for automatically cutting a flexible sheet material |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0682481A1 true EP0682481A1 (en) | 1995-11-22 |
EP0682481B1 EP0682481B1 (en) | 1998-08-12 |
Family
ID=9443834
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94905762A Revoked EP0682481B1 (en) | 1993-02-08 | 1994-01-31 | Method for automatically cutting a flexible sheet material |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0682481B1 (en) |
JP (1) | JPH08506767A (en) |
DE (1) | DE69412460T2 (en) |
ES (1) | ES2121188T3 (en) |
FR (1) | FR2701229B1 (en) |
WO (1) | WO1994017683A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19548304C2 (en) * | 1995-12-22 | 1997-09-25 | Wolfgang Dipl Ing Bruder | Cutting device for flat, pliable structures, such as. B. for leather skins or textile webs |
CN108716096A (en) * | 2018-06-22 | 2018-10-30 | 池州市达宏信息技术有限公司 | A kind of PLM clothes fabrication design cutting equipment |
CN111501314B (en) * | 2020-04-24 | 2021-06-08 | 安徽恒益纺织科技有限公司 | Line drawing device for garment fabric cutting and line drawing method thereof |
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 (en) * | 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/en not_active Expired - Fee Related
-
1994
- 1994-01-31 ES ES94905762T patent/ES2121188T3/en not_active Expired - Lifetime
- 1994-01-31 EP EP94905762A patent/EP0682481B1/en not_active Revoked
- 1994-01-31 JP JP6517710A patent/JPH08506767A/en active Pending
- 1994-01-31 WO PCT/FR1994/000117 patent/WO1994017683A1/en not_active Application Discontinuation
- 1994-01-31 DE DE69412460T patent/DE69412460T2/en not_active Revoked
Non-Patent Citations (1)
Title |
---|
See references of WO9417683A1 * |
Also Published As
Publication number | Publication date |
---|---|
JPH08506767A (en) | 1996-07-23 |
DE69412460T2 (en) | 1999-01-28 |
ES2121188T3 (en) | 1998-11-16 |
WO1994017683A1 (en) | 1994-08-18 |
FR2701229B1 (en) | 1995-04-28 |
DE69412460D1 (en) | 1998-09-17 |
EP0682481B1 (en) | 1998-08-12 |
FR2701229A1 (en) | 1994-08-12 |
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