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EP2034061B1 - Dispositif de coupe pour une machine à tisser et son procédé de fonctionnement - Google Patents

Dispositif de coupe pour une machine à tisser et son procédé de fonctionnement Download PDF

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Publication number
EP2034061B1
EP2034061B1 EP08161824A EP08161824A EP2034061B1 EP 2034061 B1 EP2034061 B1 EP 2034061B1 EP 08161824 A EP08161824 A EP 08161824A EP 08161824 A EP08161824 A EP 08161824A EP 2034061 B1 EP2034061 B1 EP 2034061B1
Authority
EP
European Patent Office
Prior art keywords
cutting
spring
cutting device
pneumatic actuator
cutting edge
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.)
Not-in-force
Application number
EP08161824A
Other languages
German (de)
English (en)
Other versions
EP2034061A1 (fr
Inventor
Remo D'incau
Marcel Christe
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.)
Itema Switzerland Ltd
Original Assignee
Itema Switzerland Ltd
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
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Application filed by Itema Switzerland Ltd filed Critical Itema Switzerland Ltd
Priority to EP08161824A priority Critical patent/EP2034061B1/fr
Publication of EP2034061A1 publication Critical patent/EP2034061A1/fr
Application granted granted Critical
Publication of EP2034061B1 publication Critical patent/EP2034061B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/70—Devices for cutting weft threads

Definitions

  • the invention relates to a cutting device for a loom according to the preamble of claim 1 and a method for operating the same according to the preamble of claim 8 and a weaving machine with such a cutting device and for carrying out such a method.
  • the various weaving machine types such as air jet loom, rapier weaving machine or projectile weaving machine, are named based on the type of weft insertion.
  • rapier weaving the weft thread is registered for example by means of a fixed to a rod or a flexible belt rapier in a shed and taken over at a transfer point in the middle part of the shed by a gripper rapier and forwarded.
  • the Bringergreifer has the task to take the presented by means of a thread roving weft safe to enter the same in the shed and precisely feed the gripper rapier.
  • the submitted weft thread must be separated from the previously entered weft before it can be entered into the shed.
  • a cutting device which comprises a fixed and a movable cutting edge.
  • the movable blade is formed on a cranked lever which communicates with a pneumatic cylinder containing a piston and a spring.
  • the cutting device is at rest by acting on the piston Spring kept open.
  • the compressed air cylinder is acted upon by a control valve with compressed air.
  • the rapier grippers are moved at high speed during weft insertion.
  • the rapier has a speed of typically 20 m / s, i. he travels a distance of 2 cm in 1 ms. Accordingly, the cutting device must be able to separate the weft within a period of a few ms, since this is not cut clean but torn off.
  • the object of the invention is to provide a cutting device for a weaving machine, in particular a rapier weaving machine, and a method for separating a weft thread to be introduced into a shed of a weaving machine, in particular a rapier weaving machine, which are capable of the weft thread within a period of time cleanly separated from a few ms.
  • Another object of the invention is to provide a weaving machine with such a cutting device and for carrying out such a method.
  • the cutting device according to the invention for a weaving machine comprises a first cutting edge on a first, typically fixed cutting carrier, a second cutting edge on a second, movably guided cutting carrier and a drive, which cooperates with the second cutting carrier, and a pneumatic actuator and a feather contains one in a shed to be entered or registered weft thread, wherein the spring by means of the pneumatic actuator can be tensioned and optionally the two cutting edges are moved apart, and wherein by means of the force of the spring, the two cutting edges are closed.
  • the second, movable blade carrier is designed as a lever arm, in particular as a rotatable or rotatably mounted lever arm.
  • the pneumatic actuator as a piston / cylinder unit or pneumatic rotary drive are formed, and / or the spring formed as a compression spring, in particular as a helical compression spring, wherein the spring may be arranged for example in the piston / cylinder unit.
  • the cutting device comprises a control valve for controlling the pneumatic actuator, for example for pressurizing the actuator to tension the spring and optionally to move the blades apart, and / or for venting the actuator to trigger the cutting operation.
  • the cutting device additionally comprises a sensor for detecting the cutting time and occasionally a control and control unit, which may be connected to the sensor and the control valve to automatically correct possible deviations from a predetermined cutting time.
  • a cutting device which has a first cutting edge on a first, typically fixed cutting carrier, a second cutting edge on a second, movably guided cutting carrier and a drive includes, which cooperates with the second blade carrier, and containing a pneumatic actuator and a spring, and separated the weft thread by means of the cutting device.
  • the spring is / are tensioned by means of the pneumatic actuator, the two blades are opened and used to separate the actuator Weft the two cutting edges closed by the force of the spring.
  • the pneumatic actuator is controlled by means of a control valve.
  • the spring is tensioned and optionally the blades are moved apart by applying pressure to the pneumatic actuator, and / or the cutting process is triggered by the pneumatic actuator being vented.
  • the cutting time is / are detected with a sensor and possible deviations between the detected cutting time and a predetermined cutting time are automatically corrected.
  • the invention comprises a weaving machine, in particular a rapier weaving machine with a cutting device according to one of the embodiments and variants described above and / or equipped for carrying out a method according to the above description.
  • the cutting device according to the invention and the method according to the invention for separating a weft thread to be introduced or inserted into a shed have the advantage that the spring can store enough potential energy to safely separate the weft thread, that the potential energy of the spring at least in principle less than 1 ms can be converted into kinetic energy, and the pneumatic actuator and the pressure supply of the same can be designed so that this comparatively slow spring, for example, within 30 ms, tensioned. Compared to a direct drive the closing movement by the pneumatic actuator, as described in the cited prior art, this results in significant savings.
  • Fig. 1 shows a schematic view of an embodiment of a loom, as used in the context of the present invention.
  • the loom 1 is formed in the illustrated embodiment as a rapier and includes a Bringergreifer 3 and a Holergreifer 4, each containing a thread clamp to receive a recorded weft yarn 2 and hold.
  • the Bringerund Holergreifer is typically each attached to a rod, not shown, or a flexible band, not shown, which are displaced and driven in the insertion direction.
  • the weft thread can be entered into a shed and at a transfer point in the middle part of the shed from the gripper rapier be taken over and forwarded.
  • the weaving machine may comprise, for example, a yarn package 2a and a yarn storage 2b, from which the weft yarn 2 can be withdrawn, and occasionally a yarn brake 5 and / or a sensor 6 to measure the yarn tension and / or optionally a thread rug or a color picker 7 with several Fadenvorlegern and / or a control unit 9 for controlling the weft insertion.
  • the weaving machine comprises a cutting device 10 for separating the weft thread 2, for example as shown in FIG Fig. 1 shown to be separated from the previously entered weft before it is entered into the shed.
  • Fig. 2 shows a detailed view of a rapier 3 and a cutting device 10 of the embodiment of Fig. 1 before separating the weft.
  • the weft thread 2 to be inserted and picked up by the picking rapier 3 is moved forward in the weft insertion direction by the picking rapier 3.
  • Fig. 2 shows the Bringergreifer in three different times, which are represented by solid and dashed outlines.
  • the weft thread 2 is held in a thread clamp of the bringer rapier and deflected at a deflection point 3a in the bringer rapier.
  • the weft thread over a thread rug 7a of a in Fig. 2 Thread storage not shown, while on the other hand, as in Fig. 2 shown, is still connected to the previously entered weft.
  • a cutting device 10 is provided to separate the weft thread to be entered.
  • the cutting time and the time required for the separation period is critical, since too early in the separation of the weft thread is exerted on the same to safely pull it during recording in the thread clamp, and on the other hand in a too late separation of the weft in the cutting device is torn.
  • Fig. 3 shows a schematic view of an embodiment of a cutting device 10 according to the present invention.
  • the cutting device comprises a first cutting edge 12.1 on a first, typically fixed blade carrier 11.1, a second cutting edge 12.2 on a movable and guided blade carrier 11.2 and a drive which cooperates with the movable blade carrier, and which includes a pneumatic actuator 14 and a spring 15 to separate a weft inserted or inserted into a shed, wherein the spring 15 is tensioned by means of the pneumatic actuator 14 and optionally the two Cutting 12.1, 12.2 are movable apart, and wherein by means of the force of the spring, the two cutting edges are closed.
  • the movable blade carrier is designed as a lever arm, for example as a rotatable or rotatably mounted lever arm.
  • a lever arm for example as a rotatable or rotatably mounted lever arm.
  • the pneumatic actuator may be designed as a piston / cylinder unit 14 with a pressure cylinder 14a and a longitudinally movable piston 14b in the same.
  • the spring 15 may be formed as a compression spring, for example as a helical compression spring, which, for example, as in Fig. 3 shown, may be arranged in the piston / cylinder unit.
  • the cutting device 10 comprises a control valve 16 for controlling the pneumatic actuator 14, for example, to pressurize the actuator to tension the spring 15 and optionally to move the blades apart, and / or occasionally for venting the actuator 14th to trigger the cutting process.
  • the control valve can be designed for example as a 3/2-way valve.
  • a pressure line or a pressure source 17 may occasionally be provided in order to supply the pneumatic actuator 14 or the control valve 17 with compressed air.
  • Fig. 4 shows a schematic view of a second embodiment of a cutting device 10 according to the present invention.
  • the cutting device comprises a first cutting edge 12. 1 on a first, typically stationary cutting carrier 11. 1, a second cutting edge 12.2 on a movable and guided blade carrier 11.2 and a drive, which cooperates with the movable blade carrier, and which includes a pneumatic actuator 14 and a spring 15 to separate a wedge thread to be inserted or inserted into a shed, wherein the spring 15 by means of pneumatic actuator 14 can be tensioned and optionally the two cutting edges 12.1, 12.2 are moved apart, and wherein by means of the force of the spring, the two cutting edges are closed.
  • the movable blade carrier is designed as a lever arm, for example as a rotatable or rotatably mounted lever arm.
  • the pneumatic actuator be designed as a pneumatic rotary drive 14 '.
  • the spring 15 may be formed, for example, as a compression spring, for example as a helical compression spring. But it is also possible, for example, to form the spring 15 as a torsion spring and to integrate occasionally in the pneumatic rotary drive.
  • the cutting device 10 comprises a control valve 16 for controlling the pneumatic actuator 14.
  • a control valve 16 for controlling the pneumatic actuator 14.
  • Fig. 5 shows an oblique view of a third embodiment of a cutting device 10 according to the present invention.
  • the cutting device comprises a first cutting edge 12.1 on a first, typically fixed blade carrier 11.1, a second cutting edge 12.2 on a movable and guided blade carrier 11.2 and a drive, which cooperates with the movable blade carrier, and a pneumatic actuator 14 and a spring 15 contains, to separate a weft thread 2 to be entered or registered in a shed, wherein the spring 15 can be tensioned by means of the pneumatic actuator 14 and optionally the two cutting edges 12.1, 12.2 are moved apart, and wherein the two cutting edges can be closed by means of the force of the spring ,
  • the movable blade carrier is designed as a lever arm, for example as a rotatable or rotatably mounted lever arm.
  • a lever arm for example as a rotatable or rotatably mounted lever arm.
  • the pneumatic actuator be designed as a piston / cylinder unit 14.
  • the spring 15 may be formed as a compression spring, for example as a helical compression spring, which, for example, as in Fig. 5 shown, can be arranged coaxially with the piston / cylinder unit.
  • the movement of the piston in the piston-cylinder unit 14 may, for example, as in Fig. 5 are transmitted by means of a piston rod 14c on a cranked lever 14d, which in turn can be connected to the movable blade carrier 11.2.
  • a thread ripper 7a shown is not part of the cutting device 10.
  • the cutting device 10 comprises a control valve 16 for controlling the pneumatic actuator 14.
  • a control valve 16 for controlling the pneumatic actuator 14.
  • the cutting device 10 may additionally include a sensor 13 for detecting the cutting time and, if necessary, a control and control unit 18, which may be occasionally connected to the sensor and the control valve 16 to possible deviations from to correct a given cutting time.
  • Possible deviations between the detected and predetermined cutting time are mainly due to the cutting device, for example, the switching time of the control valve or the venting of the pneumatic actuator may change or by the friction conditions in the pneumatic actuator or between the blades change, for example in the time a machine stop or as a result of temperature changes or wear.
  • the described Control of the cutting time has the advantage that it can be precisely adhered to, even if the time interval between initiation of the cutting process and cutting time, ie the time by the weft is separated, is subject to change in practical operation.
  • a cutting device 10 which comprises a first cutting edge 12.1 on a first, typically fixed blade carrier 11.1, a second cutting edge 12.2 on a movable and guided blade carrier 11.2 and a drive, which cooperates with the movable blade carrier, and a pneumatic Actuator 14, 14 'and a spring 15 contains, and the weft thread 2 separated by means of the cutting device 10.
  • the spring 15 is / are tensioned by means of the pneumatic actuator 14, 14 ', the two cutting edges 12.1, 12.2 are opened and, to separate the weft thread, the two cutting edges are closed by means of the force action of the spring.
  • the pneumatic actuator 14, 14 ' is controlled by means of a control valve 16.
  • the spring 15 is tensioned and optionally the cutters are moved apart by applying pressure to the pneumatic actuator, and / or the cutting process is triggered by the pneumatic actuator being vented.
  • the cutting time is / are detected with a sensor 13 and possible deviations between the detected cutting time and a predetermined cutting time are corrected.
  • the inventive cutting device and the inventive method for separating a weft thread in a loom thanks to the spring drive of the closing movement, it is possible to separate the weft thread within a few milliseconds so that it can be cut cleanly, even if the cutting device is used on a high-speed rapier weaving machine.
  • the described control for the cutting time allows to comply with the same more accurately, even if the time interval between the initiation of the cutting operation and the time when the weft thread is separated changes in practical operation.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Claims (12)

  1. Dispositif de coupe (10) pour un métier à tisser (1), en particulier un métier à tisser à pince, comprenant un premier couteau (12.1) sur un premier porte-couteau (11.1), un deuxième couteau (12.2) sur un porte-couteau mobile et guidé (11.2) et un entraînement, qui coopère avec le porte-couteau mobile, et qui comprend un actionneur pneumatique (14, 14') et un ressort (15), afin de couper un fil de trame (2) à introduire ou introduit dans un pas de chaîne, caractérisé en ce que le ressort (15) peut être tendu au moyen de l'actionneur pneumatique (14, 14'), et en ce que les deux couteaux (12.1, 12.2), peuvent être fermés sous l'action de la force du ressort.
  2. Dispositif de coupe selon la revendication 1, dans lequel le porte-couteau mobile (11.2) se présente sous la forme d'un bras de levier, en particulier d'un bras de levier rotatif ou monté de façon rotative.
  3. Dispositif de coupe selon la revendication 1 ou 2, dans lequel l'actionneur pneumatique se présente sous la forme d'une unité piston/cylindre (14, 14a, 14b) ou d'un entraînement pneumatique rotatif (14').
  4. Dispositif de coupe selon l'une quelconque des revendications 1 à 3, dans lequel le ressort (15) se présente sous la forme d'un ressort de compression, en particulier d'un ressort de compression hélicoïdal, et dans lequel le ressort est agencé en particulier dans l'unité piston/cylindre (14, 14a, 14b).
  5. Dispositif de coupe selon l'une quelconque des revendications 1 à 4, comprenant une soupape de commande (16) pour la commande de l'actionneur pneumatique (14, 14'), en particulier pour appliquer une pression à l'actionneur afin de tendre le ressort (15) et d'écarter au choix les couteaux l'un de l'autre, et/ou pour purger l'actionneur, afin de déclencher l'opération de coupe.
  6. Dispositif de coupe selon l'une quelconque des revendications 1 à 5, comprenant en outre un enregistreur de mesure (13) pour détecter l'instant de coupe.
  7. Dispositif de coupe selon la revendication 6, comprenant en outre une unité de régulation et de commande (18), qui est reliée à l'enregistreur de mesure (13) et à la soupape de commande (16), afin de corriger automatiquement d'éventuels écarts par rapport à un instant de coupe prédéterminé.
  8. Procédé pour couper un fil de trame (2) à introduire ou introduit dans un pas de chaîne d'un métier à tisser (1), en particulier d'un métier à tisser à pince, dans lequel il est prévu un dispositif de coupe (10), qui comprend un premier couteau (12.1) sur un premier porte-couteau (11.1), un deuxième couteau (12.2) sur un porte-couteau mobile et guidé (11.2) et un entraînement, qui coopère avec le porte-couteau mobile, et qui comprend un actionneur pneumatique (14, 14') et un ressort (15), et le fil de trame (2) est coupé au moyen du dispositif de coupe (10), caractérisé en ce que l'on tend le ressort (15) au moyen de l'actionneur pneumatique (14, 14') et on ouvre les deux couteaux (12.1, 12.2) et en ce que l'on ferme les deux couteaux au moyen de l'action de la force du ressort pour couper le fil de trame (2).
  9. Procédé selon la revendication 8, dans lequel on commande l'actionneur pneumatique (14, 14') au moyen d'une soupape de commande (16).
  10. Procédé selon l'une quelconque des revendications 8 ou 9, dans lequel on tend le ressort (15) et on écarte au choix les couteaux (12.1, 12.2) l'un de l'autre, en soumettant l'actionneur pneumatique (14, 14') à la pression, et/ou dans lequel on déclenche l'opération de coupe en purgeant l'actionneur pneumatique (14, 14').
  11. Procédé selon l'une quelconque des revendications 8 à 10, dans lequel on détecte l'instant de coupe avec un enregistreur de mesure (13), et on corrige automatiquement d'éventuels écarts entre l'instant de coupe détecté et un instant de coupe prédéterminé.
  12. Métier à tisser, en particulier métier à tisser à pince, équipé d'un dispositif de coupe (10) selon l'une quelconque des revendications 1 à 7.
EP08161824A 2007-09-10 2008-08-05 Dispositif de coupe pour une machine à tisser et son procédé de fonctionnement Not-in-force EP2034061B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08161824A EP2034061B1 (fr) 2007-09-10 2008-08-05 Dispositif de coupe pour une machine à tisser et son procédé de fonctionnement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07116005 2007-09-10
EP08161824A EP2034061B1 (fr) 2007-09-10 2008-08-05 Dispositif de coupe pour une machine à tisser et son procédé de fonctionnement

Publications (2)

Publication Number Publication Date
EP2034061A1 EP2034061A1 (fr) 2009-03-11
EP2034061B1 true EP2034061B1 (fr) 2010-09-01

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ID=39180833

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08161824A Not-in-force EP2034061B1 (fr) 2007-09-10 2008-08-05 Dispositif de coupe pour une machine à tisser et son procédé de fonctionnement

Country Status (5)

Country Link
US (1) US20090065089A1 (fr)
EP (1) EP2034061B1 (fr)
JP (1) JP2009068157A (fr)
CN (1) CN101387038A (fr)
DE (1) DE502008001238D1 (fr)

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BE1019807A3 (nl) * 2011-07-12 2012-12-04 Picanol Inrichting en werkwijze voor het klemmen van een inslagdraad.
CN104593936B (zh) * 2015-03-02 2016-02-03 李群星 撞击式高速剪纬装置
CN105177824A (zh) * 2015-09-17 2015-12-23 江苏华佳丝绸有限公司 一种用于解决剑杆织机上纬向张力大的剪刀装置
CN108754795A (zh) * 2018-09-12 2018-11-06 太平洋纺织机械（常熟）有限公司 剑杆织机用的纬纱剪刀装置
TWI732251B (zh) * 2018-09-27 2021-07-01 義大利商桑德森力瑪集團有限公司 用於無梭子紡織機的緯紗切割裝置
CN109457375B (zh) * 2018-11-19 2020-06-16 南京玻璃纤维研究设计院有限公司 一种2.5d预制体纬纱剪切机构

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Also Published As

Publication number Publication date
DE502008001238D1 (de) 2010-10-14
CN101387038A (zh) 2009-03-18
JP2009068157A (ja) 2009-04-02
EP2034061A1 (fr) 2009-03-11
US20090065089A1 (en) 2009-03-12

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