EP0660770B1 - Dispositif d'aspiration pour machine de coupe automatique et procede de decoupe mettant en uvre ledit dipositif - Google Patents

Dispositif d'aspiration pour machine de coupe automatique et procede de decoupe mettant en uvre ledit dipositif Download PDF

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Publication number
EP0660770B1
EP0660770B1 EP93917859A EP93917859A EP0660770B1 EP 0660770 B1 EP0660770 B1 EP 0660770B1 EP 93917859 A EP93917859 A EP 93917859A EP 93917859 A EP93917859 A EP 93917859A EP 0660770 B1 EP0660770 B1 EP 0660770B1
Authority
EP
European Patent Office
Prior art keywords
air
suction
turbine
motor
fan
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
Application number
EP93917859A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0660770A1 (fr
Inventor
Régis LALLEMENT
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
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
Family has litigation
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Application filed by Lectra Systemes SA filed Critical Lectra Systemes SA
Publication of EP0660770A1 publication Critical patent/EP0660770A1/fr
Application granted granted Critical
Publication of EP0660770B1 publication Critical patent/EP0660770B1/fr
Anticipated expiration legal-status Critical
Revoked 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
    • B26D7/01—Means for holding or positioning work
    • B26D7/018—Holding the work by suction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B2215/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B2215/006—Suction tables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F2210/00—Perforating, punching, cutting-out, stamping-out, severing by means other than cutting of specific products
    • B26F2210/12—Perforating, punching, cutting-out, stamping-out, severing by means other than cutting of specific products of fabrics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/202—With product handling means
    • Y10T83/2066—By fluid current
    • Y10T83/207—By suction means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/748—With work immobilizer

Definitions

  • the present invention relates to a suction device for an automatic cutting machine of a stack of sheet materials and to a cutting method using said device.
  • Automatic cutting machines generally include a cutting table on which is placed a stack of sheet materials (fabrics, skins, papers, ...) to be cut, a movable cutting tool above the stack and a device for suction generally associated with a waterproof film disposed on the stack, for holding the stack on said table.
  • the suction device comprises a turbine provided with an air inlet circuit and an air exhaust circuit, driven by an electric motor equipped with a fan.
  • this assembly produces a significant vacuum at the upper face of the cutting table whose value in steady state is constant. However, this value changes as a function of the leaks generated during the cutting phase of the stack of material, the depression decreasing with the increase in the level of leakage.
  • US-A-5,062,334 relates to a suction device fitted to a machine intended for cutting a stack of sheets.
  • This device comprises a turbine driven by an electric motor and provided on the one hand with an air intake circuit drawn in at the cutting area and, on the other hand, with an exhaust circuit air. The vacuum created keeps the stack of sheets on the cutting table.
  • US-A-4 328 726 describes a suction device designed to create a variable depression at the top face of a cutting table.
  • some automatic cutting machines are equipped with a conveyor.
  • This conveyor also serves as a cutting area and is operated in order to advance the material to be cut.
  • the high vacuum exerted on the cutting table generates significant friction which, to be overcome, requires a motor for driving the cutting conveyor of high power.
  • some machines are equipped with a system called "trap", generating a high leakage rate at the cutting table, which lowers the level of vacuum. The movement efforts of the conveyor are thus reduced, but this phase generates a very significant noise.
  • the suction device comprising the turbine and its electric drive motor is generally enclosed in a soundproof box.
  • the old suction devices have the drawback of evacuating hot air into the cutting workshop, which is inconvenient for operators.
  • cutting waste is sucked into the turbine, which can affect its operation.
  • the object of the present invention is to solve these technical problems satisfactorily.
  • a suction device for maintaining a stack of sheet material on the cutting table of an automatic cutting machine comprising a turbine provided with a air intake circuit sucked in at the cutting zone to create a vacuum intended to hold the stack on the table and an air exhaust circuit, said turbine being driven by an electric motor equipped with a fan with an air outlet pipe, characterized in that the electric drive motor includes means for varying the speed of rotation to adjust the vacuum.
  • said speed variation means consist of two separate electrical windings equipping the motor and thus producing two values of depression.
  • said speed variation means comprise a frequency converter of the power supply electric motor to obtain different vacuum values.
  • the device comprises means for cooling the air exhaust cooperating with means for complementary cooling of the drive motor.
  • said means for cooling the exhaust air are constituted by the junction of the air outlet duct of the engine fan with the air exhaust circuit of the turbine and said means additional cooling consist of an additional fan mounted on the air outlet duct of the fan of said motor.
  • the junction between the air outlet pipe of the additional fan and the air exhaust circuit of the turbine has a curved internal flap to prevent air backflow.
  • the device is enclosed in a soundproof box comprising an intake air intake opening, an exhaust air outlet opening and two outside air intake openings and the air opening expelled lead into one or more silencers in series.
  • Another object of the invention is an automatic cutting process for a stack of sheet material placed on a cutting table using in particular a suction turbine provided with a suction air intake circuit and a air exhaust circuit, driven by an electric motor equipped with at least one fan to create a vacuum on said table, characterized in that the speed of rotation of the turbine drive motor is varied so to adjust the vacuum selectively between the cutting phases and the loading or transfer phases of the battery on the cutting table.
  • the exhaust air from the turbine is cooled and the additional cooling of the electric motor by the fan by injecting air from the motor into the exhaust circuit of the turbine.
  • the air from the engine is injected into the exhaust circuit by a venturi effect and the injection is forced into the exhaust circuit by means of an additional fan.
  • a low vacuum value is adopted for the loading or transfer phase and a high value for the cutting phase.
  • the invention therefore makes it possible to use a high vacuum during cutting and a much lower vacuum during the advance of the stack and its loading on the table by reducing the noise level of the machine.
  • This has the advantage of reducing the drive forces of the conveyor and therefore of being able to use a motor with lower electrical consumption.
  • the turbine rotating slower and the vacuum being lower the machine in operation is all the quieter and the power consumption is also reduced.
  • the additional cooling means of the electric drive motor of the turbine make it possible, when this motor is stopped, and therefore also its internal fan, to still ensure cooling.
  • the suction device shown in FIG. 1 is enclosed in a soundproof box C comprising an orifice 1 for the intake of air sucked in by a turbine 4 at the level of the cutting table or of the cutting conveyor A, an orifice 2 of air outlet expelled by said turbine 4 and two orifices 3.3 ′ for admission of outside air arranged on opposite sides of the box C and associated with acoustic insulation means 30,30 '.
  • the turbine 4 is provided with a suction air intake circuit 41 comprising a filter or a settling box 41a for cutting waste and an air exhaust circuit 40.
  • the settling box is provided under the shape of a box in which the sucked air is introduced from the bottom and exits from the top. The air therefore flows through the decantation box from bottom to top, forming a vortex and the heavy dust falls to the bottom of the box by gravity. To accentuate this vortex, we can add baffles which reduce the kinetic energy of the dust to promote gravity.
  • the turbine 4 is driven by an electric motor 5 equipped with a fan 15 and means for varying the speed.
  • the orifice 3 for admitting the outside air is connected to a pipe 31 opening into the interior of the casing C near the motor drive shaft 5.
  • the orifices 3.3 ′ make it possible to establish a circulation of fresh air inside the casing C.
  • the means for varying the speed of rotation of the drive motor must at least allow two vacuum values to be obtained. The highest value is used to hold and compress the fabric when cutting. The lowest value is adopted when moving the cutting conveyor, i.e. during loading or transfers. In fact, during these displacements the stack of material must be immobilized, but too high a vacuum value requires a drive motor of the conveyor sufficiently powerful to overcome the various frictions generated by the vacuum between the conveyor and its guide members. A vacuum value much lower than that used during cutting is sufficient to maintain the stack of material and it allows the use of a less powerful conveyor drive motor.
  • the power consumption of the machine is therefore reduced, as is the wear of the guide elements of the conveyor which are subjected to less effort.
  • the turbine turning slower the power consumption of the turbine drive motor is reduced.
  • the cutting machine as a whole becomes less noisy.
  • the variation in the speed of rotation of the motor 5 of the turbine 4 is obtained according to a first embodiment using a drive motor 5 comprising two separate windings and thus producing, through the turbine 4, two values of depression. Each winding being selected by a control device provided with relay type contactors controlled by the digital control of the cutting machine as a function of the desired vacuum value.
  • the means for varying the speed of rotation of the motor 5 comprise a variator of the frequency of the electrical supply of said motor 5.
  • a variator By acting on the variator, variations of the flow rate of air sucked in by the turbine and therefore continuous variations of the vacuum within a range of values.
  • the depression can be adjusted to determined values to improve the quality of the cut.
  • the device of the invention comprises means for cooling the exhaust air which cooperate with means for cooling the engine 5.
  • the means for cooling the exhaust air consist of the junction 45 of the duct 50 for the air outlet of the fan 15 with the circuit 40 for exhausting the air from the turbine.
  • the complementary cooling means of the motor 5 consist of an additional fan 51 and placed on the duct 50 for the air outlet of the fan 15.
  • the purpose of the additional cooling means is to avoid thermal shocks to the drive motor 5 of the turbine 4 and to cool the air expelled in the pipe 40 by the turbine.
  • This air can reach a temperature of 80 ° C, which can be a nuisance for operators if the air is expelled directly into the cutting workshop.
  • the electric motor is subjected to thermal shocks because the entire suction device is enclosed in the soundproof box C.
  • the fan 15 is responsible for cool its windings.
  • the air circulates little in the suction box C and, when the motor 5 stops, its temperature can reach 120 ° C, which risks damaging its electrical windings.
  • Line 50 conveys the air recovered at the outlet of the fan 15 of the electric motor 5 towards the exhaust circuit 40 of the turbine 4.
  • the additional fan 51 propels the air stirred by the fan 15 in the line 50 towards the junction 45 with the circuit 40.
  • This additional fan also serves to cool the engine when it has just been stopped, which prevents it from impact. thermal.
  • the air coming from the electric motor 5 has a temperature of around 40 ° C, it is mixed with the exhaust air from the turbine, the temperature of which is close to 80 ° C. After mixing, the temperature of the air evacuated by the suction device is around 50 ° C instead of 80 ° C.
  • the turbine has a low flow rate which compensates for the leaks created by the cutting of the material and of the waterproof film which maintains it.
  • the additional fan 51 has a flow Q2 greater than the flow Q1 of the turbine 1.
  • the junction 45 is equipped at the intersection of the flows with a curved internal flap 45a which makes it possible to channel the air flows towards the orifice 2 of outlet of the box C, and this whatever the turbine flow rate 4.
  • the scoop Due to its curved shape, the scoop allows the air coming from the turbine to pass while preventing it from blowing back the air coming from the electric motor 5 thereby promoting the so-called “venturi” phenomenon "because the air evacuated by the turbine 4 draws the air coming from the additional fan 51.
  • the orifice 2 for the outlet of air expelled from the box C is directly connected to a first exhaust silencer 21 located horizontally in the cutting machine and invisible from the outside.
  • This silencer 21 attenuates medium and high frequency sound waves, but also low frequency waves by creating a phase shift.
  • a second silencer 22 called a chimney can be connected in series at one end of the first muffler, depending on the side of the machine on which you want to position the exhaust stack.
  • This silencer 22 essentially attenuates medium and high frequency sound waves by using a sound absorbing material.
  • the operation of the silencers 21, 22 is illustrated in FIG. 3.
  • the air enters the first silencer 21 through an orifice located substantially in the middle of the length of the body of the silencer.
  • the incoming air hits the bursting plate 20 separating the interior volume of the silencer 21 into two parts defining two distinct paths: a direct path F1 to the second silencer 22 and an indirect path F2 oriented first towards the obstructed side of the silencer 21 and whose length is much greater than that of F1.
  • the bursting sheet 20 therefore separates the expelled air into two distinct flows F1, F2, one of which travels a much longer distance than the other before being introduced into the silencer 22.
  • the exhaust silencer 21 has the form of a tube, the internal longitudinal wall 21a of which is formed by a perforated sheet while the external longitudinal wall of the tube is a full sheet.
  • a sound insulating material 12 is inserted between the two sheets.
  • This material can be, for example, foam, rock wool or glass wool.
  • Part of the sound waves of the air flows F1, F2 passes through the holes of the internal perforated sheet 21a and is trapped in the insulating material, which has the consequence of further attenuating the operating sound level of the device.
  • the second muffler 22 forming the exhaust chimney is produced in the same way, but does not have a burst plate 20.
  • This chimney can be fixed to one or the other of the lateral ends of the first muffler 21.
  • the bursting sheet having a symmetrical shape and the air inlet of the first muffler 21 being located in the middle of its length, the principle sound wave phase shift remains the same.
  • the other end of the muffler 21 is closed by a flange 21b possibly removable, the structure of which is the same as that of the longitudinal wall.
  • the attachments of the side end flange 21b and the connection elbow 23 of the chimney to the silencer 21 are identical.
  • these fasteners can be simply produced by holes through which pass bolts screwed into the ends of the silencer 21.
  • the two silencers 21, 22 in series make it possible to obtain a drop in the sound level of approximately 20 dBa.
  • the silencers 21, 22 can be connected directly to an air discharge pipe outside the building in which the cutting machine is located.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
EP93917859A 1992-09-01 1993-08-10 Dispositif d'aspiration pour machine de coupe automatique et procede de decoupe mettant en uvre ledit dipositif Revoked EP0660770B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9210455 1992-09-01
FR9210455A FR2695057B1 (fr) 1992-09-01 1992-09-01 Dispositif d'aspiration pour machine de coupe automatique et procédé de découpe mettant en Óoeuvre ledit dispositif.
PCT/FR1993/000800 WO1994005470A1 (fr) 1992-09-01 1993-08-10 Dispositif d'aspiration pour machine de coupe automatique et procede de decoupe mettant en ×uvre ledit dipositif

Publications (2)

Publication Number Publication Date
EP0660770A1 EP0660770A1 (fr) 1995-07-05
EP0660770B1 true EP0660770B1 (fr) 1996-07-24

Family

ID=9433129

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93917859A Revoked EP0660770B1 (fr) 1992-09-01 1993-08-10 Dispositif d'aspiration pour machine de coupe automatique et procede de decoupe mettant en uvre ledit dipositif

Country Status (6)

Country Link
US (1) US5626066A (es)
EP (1) EP0660770B1 (es)
DE (1) DE69303823T2 (es)
ES (1) ES2091023T3 (es)
FR (1) FR2695057B1 (es)
WO (1) WO1994005470A1 (es)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5836224A (en) * 1995-12-27 1998-11-17 Gerber Garment Technology, Inc. Method and apparatus for working on sheet material
US6021772A (en) * 1997-03-21 2000-02-08 Wacker Siltronic Gesellschaft Fur Halbleitermaterialien Ag Bandsaw and process for cutting off slices from a workpiece
US6880670B2 (en) * 2002-10-29 2005-04-19 Beda Charles Dondi Muffler for suction system exhaust air used with an automatic cutting machine
US20050034576A1 (en) * 2003-08-11 2005-02-17 Ray Theodore M. Bun slicer
KR20050038710A (ko) * 2003-10-22 2005-04-29 삼성전자주식회사 송풍장치 및 이를 갖춘 공기조화기
DE102005061787A1 (de) * 2005-12-23 2007-06-28 Fette Gmbh Vorrichtung zur Erzeugung eines Unterdrucks im abgedichteten Raum einer Tablettenpresse und/oder eines Isolators
US7284305B1 (en) 2007-01-12 2007-10-23 Milliken & Company Apparatus and process for automatically cutting textile web with reduced wrinkling
EP2008736B1 (de) * 2007-06-30 2011-07-27 TRUMPF Werkzeugmaschinen GmbH + Co. KG Werkzeugmaschine und Verfahren zum Ausschleusen eines Werkstückteils

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE496610A (es) * 1950-06-27
US3598006A (en) * 1970-02-02 1971-08-10 Gerber Garment Technology Inc Method for working on sheet material and other objects
ES8101972A1 (es) * 1979-01-31 1980-12-16 Gerber Garment Technology Inc Perfeccionamientos en un aparato para trabajar sobre mate- rial laminar
JP2834139B2 (ja) * 1988-05-11 1998-12-09 株式会社日立製作所 冷凍装置
US5103153A (en) * 1988-11-02 1992-04-07 North American Philips Corporation Control equipment for multi-speed electric motors
US5062334A (en) * 1990-05-21 1991-11-05 Killilea Timothy R Apparatus for cleaning cutting table support surface
US5141403A (en) * 1990-12-07 1992-08-25 Cornell Research Foundation, Inc. Two-level vacuum system controller with adjustable speed drive
KR930005714B1 (ko) * 1991-06-25 1993-06-24 주식회사 금성사 진공 청소기의 흡입력 제어방법 및 장치
JP2979181B2 (ja) * 1991-09-18 1999-11-15 株式会社島精機製作所 裁断装置
ES2073961B1 (es) * 1991-09-18 1997-05-16 Shima Seiki Mfg Aparato de cortar hojas.
WO1994019134A1 (en) * 1993-02-18 1994-09-01 M-Pact Corporation Cutting device and assembly

Also Published As

Publication number Publication date
FR2695057B1 (fr) 1994-11-18
US5626066A (en) 1997-05-06
EP0660770A1 (fr) 1995-07-05
DE69303823D1 (de) 1996-08-29
WO1994005470A1 (fr) 1994-03-17
DE69303823T2 (de) 1997-01-16
ES2091023T3 (es) 1996-10-16
FR2695057A1 (fr) 1994-03-04

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