US3902535A - Weft insertion system for weaving looms - Google Patents

Weft insertion system for weaving looms Download PDF

Info

Publication number
US3902535A
US3902535A US463450A US46345074A US3902535A US 3902535 A US3902535 A US 3902535A US 463450 A US463450 A US 463450A US 46345074 A US46345074 A US 46345074A US 3902535 A US3902535 A US 3902535A
Authority
US
United States
Prior art keywords
shuttle
guide
weaving
linear motor
shed
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.)
Expired - Lifetime
Application number
US463450A
Other languages
English (en)
Inventor
Josef Jusko
Ernst Grieshaber
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.)
Georg Fischer AG
Original Assignee
Georg Fischer AG
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
Application filed by Georg Fischer AG filed Critical Georg Fischer AG
Application granted granted Critical
Publication of US3902535A publication Critical patent/US3902535A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • D03D49/24—Mechanisms for inserting shuttle in shed
    • D03D49/44—Mechanisms for inserting shuttle in shed whereby the shuttle is propelled by electric or magnetic means

Definitions

  • ABSTRACT A gripper shuttle weaving machine in which a weaving shuttle travels through the shed of warp threads and introduces a weft thread, wherein the shuttle consists of a highly conductive non-magnetic material (for example aluminum) and is propelled along guide lame]- lae arranged in the shed by an asynchronous linear motor arranged outside the shed in the direction in which the weft thread is introduced.
  • a weaving shuttle travels through the shed of warp threads and introduces a weft thread
  • the shuttle consists of a highly conductive non-magnetic material (for example aluminum) and is propelled along guide lame]- lae arranged in the shed by an asynchronous linear motor arranged outside the shed in the direction in which the weft thread is introduced.
  • This invention relates to a gripper" shuttle weaving machine in which a shuttle travels through a shed and introduces a weft thread and wherein the shuttle is pro pelled by an asynchronous linear motor.
  • the shuttle In order to reduce the friction forces between the shuttle and the warp threads produced by the relatively high transverse traction of the shuttle, the shuttle is generally provided with rollers or small wheels which travel over the warp threads supported by a flat bearing surface. In spite of this, it is not possible, because of the considerable friction of the weaving shuttle on the shuttle race, to overcome the low drive efficiency and substantially eliminate wear of the bearing surface and the danger of destroying the warp threads.
  • Another disadvantage is that a stator fixed to the sley is used to generate the travelling electromagnetic field over the entire length of the shuttle race and the components of this stator, consisting largely of iron, produce an additional moment of inertia in the movement of the sley. Since iron allows only a limited magnetic flux, relatively large amounts of iron have to be used in the shuttle to provide the necessary thrust forces on the shuttle, which in turn increases the mass to be accelerated which results in a correspondingly high dissipation of energy during braking.
  • the shuttle is in the form of a magnetic armature which is guided by ferromagnetic guide plates engaging in the shed, so that the shuttle slides through the shed without coming into contact with the warp threads.
  • the guide plates are also used for supporting the shuttle and for magnetically field-shunting the travelling magnetic field (see German Patentschrifts Nos. 1,066,958 and 1,072,569).
  • the weaving machines described above in which the travelling electromagnetic field is generated by an alternating current or by a direct current and a collector, generally involve difiiculties with starting up and slowing down the shuttle, because this takes place at low frequencies and voltages but uses high currents.
  • the shuttle may be asynchronously entrained by the travelling magnetic field.
  • the linear motor it is possible by specially designing the linear motor to transfer the magnetic return material to the fixed stator of the linear motor (UK. Pat. No. 763,362).
  • the bobbin-carrying part of the shuttle is provided with an additional drive member in the form of a thin non-magnetic metal plate which engages in the air gap of the stator to drive the shuttle.
  • the driving and decelerating linear motor system is arranged either over the entire weaving width or only over a part thereof, depending upon the force required.
  • the effect of the additional drive plate is to increase the space occupied by the shuttle, with the result that considerable distances have to be overcome by the sley and the reed because of the relatively wide shed opening.
  • acceleration and deceleration of the relatively high mass of the bobbin shuttle necessitates relatively high rotor winding currents.
  • the resultant heating of the rotor reduces the efficiency of the drive arrangement, in addition to which the warp thread is in danger of being destroyed.
  • a gripper shuttle weaving machine comprising:
  • a weaving shuttle consisting essentially of an electrically conductive non-magnetic material; and an asynchronous linear motor, for accelerating the weaving shuttle,
  • a guide beam within the motor forming a magnetic return path and a trajectory guide for the shuttle; and preferably lamellae-like shuttle guides located in the shed throughout the trajectory of the shuttle.
  • FIG. 1 is a diagrammatic view of a linear motor acting as an accelerator. and brake for a shuttle which is in the form of apart of a ring and which is guided in the linear motor by means of a guide beam and in the shed by means of lamellae;
  • FIG. 2 shows various embodiments of the shuttle in cross-section, namely:
  • dumbell in the form of a dumbell
  • FIG. 3 is a diagrammatic vertical section through the shed, with guide lamellae arranged on the sley, for a weaving shuttle in the form of a part of a ring showing the position of the sley during beating-up;
  • FIG. 4 is a vertical'section through a shuttle guide beam in the linear motor showing an air-cushion for the weaving shuttle;
  • FIG. 5 is a diagrammatic view of one embodiment of the weaving shuttle with a thread gripper
  • FIG. 6 is a diagrammatic elevation of the guide lamellae arranged on the sley for the weaving shuttle (shown in section) according to FIG. 3;
  • FIG. 7 is a diagrammatic view, partly cut away, of the windings of the stator of an accelerator and brake.
  • FIG. 1 shows an accelerator 1 and brake 4 for a shuttle 9, both in the form of asynchronous linear motors.
  • the reference 7 denotes the guiding means for a shuttle in the shed which, in the interests of clarity, has not been shown in FIG. 1 in common with the other known components of conventional weaving machines, such as the reed, heddles etc.
  • the reference 9 denotes a shuttle to be introduced into the accelerator l, for example a gripper shuttle, to which the weft thread is attached in a delivery unit (not shown) or which is provided with a length of weft filament adapted to the cloth width.
  • a guide beam 3 on which the shuttle 9 is guided consists of a material of high magnetic permeability, for example lamellae of soft iron, whose contact or bearing surface may be provided with a wear-resistant coating.
  • the guide beam 3 performs two functions: firstly it guides the shuttle inside the stator 2 and, secondly, acts as a magnetic return for the stator 2.
  • the shuttle After leaving the accelerator 1, the shuttle (denoted by the reference 10 in this position) slides through the shed on guide lamellae 8 of the shuttle guide 7 in the shed.
  • the accelerator 1 like the brake arranged at the opposite end of the shed, is arranged laterally outside the warp or shed.
  • the shuttle After leaving the shed, the shuttle is guided on a guide beam 6 into a stator 5 of the brake 4 where it is suitable decelerated to a residual velocity, for example electromagnetically by parallel-current or counter-current braking or by oversynchronous braking.
  • the operations known from conventional weaving machines, such as thread deceleration, thread cutting, beatingup, shed change, selvage formation, etc. are carried out in synchronism with shuttle deceleration with corresponding phase displacement.
  • the shuttle 10 leaves the stator 5 of the brake 4 at its residual velocity and returns through a conveyor shown schematically by chain dotted lines C to the delivery unit and to the input end of the accelerator 1.
  • An asynchronous motor which can be energised by a continuous alternating current at a constant frequency is used to propel the shuttle 9 in the accelerator 1. Control of the firing rate of the shuttles has to be taken over by the mechanical shuttle insertion unit.
  • the air gap 12 (FIG. 7) between the stators 2 and 5 and the guide beams 3 and 6 should be as small as possible. This is achieved by making the shuttles 9 and 10 with thin walls.
  • the linear motor can also be energised by impulse-like altematingcurrent, in which case the impulse sequence has a pulse repetition rate corresponding to the shuttle insertion rate or frequency.
  • Energy can also be saved by varying the velocity of the travelling magnetic field during accelaration of the shuttle 9 or 10, for example by locally varying the magnetic pole interval along the acceleration path (without any change in the energising frequency for the linear motor) or by varying the energising frequency for the linear motor during acceleration of the shuttle.
  • the shuttle 9 is best made with thin walls or is provided at least partly with thin-walled drive surfaces to derive maximum efficiency from the electromagnetic drive.
  • the other properties required for the shuttle 9 or 10 can be obtained by suitable shuttle geometry and by guiding the shuttle in the shed.
  • the shuttle can assume various forms, as illustrated in FIG. 2.
  • the shuttles 9 and 10 shown in FIG. 1 have the crosssection shown in FIG. 2a, i.e., is in the form of a part of a ring. However, it can assume other cross-sectional forms such as those shown in FIG. 2b to 23.
  • the guide beams 3 and 6, the guide lamellae 8 and the geometrical form of the stators 2 and 5 also have to be adapted to the particular cross-sectional form selected.
  • the supports 17 for the guide beams 3 and 6 illustrated in FIG. 1 have to be adapted to the particular form selected for the shuttle cross-section.
  • FIG. 3 is a cross-section through a widely opened shed 13 formed by the warp threads 26, a reed l4 and the guide lamellae 8. The latter two are fixed to the sley 15. After the shuttle 10 has passed through the shed guided by the guide lamellae 8, the sley 15 isturned to the left in the direction of the arrow 16 out of the rest position illustrated into the position shown in broken lines about a pivot arranged below the shed. As a result of this movement, the guide lamellae 8 are swung out of the shed 13, so that only the reed 14 is left in the shed 13 and beats up the weft thread 26' introduced by the shuttle 10 onto the cloth 25.
  • FIG. 4 is a cross-section through the guide beams 3 and 6 arranged in the stators 2 and 5 and the shuttle 9.
  • Compressed air is admitted to the guide beams 3 and 6, forming a cushion of air between the surface of the guide beams 3 and 6 and the inner surface of the shuttle 9.
  • the compressed air is supplied through a duct 17a in the support 17 for the guide beams.
  • the air is discharged through radial bores 19, which open into an air duct 18 extending axially along the shuttle guide beams 3 and 6, into the air gap 20 between the shuttle 9 and the guide beams 3 and 6.
  • FIG. 5 diagrammatically illustrates the local arrangement of a thread gripper 21 to resiliently grip the weft thread 26', on the shuttle 9 which has a cross-section substantially of the kind illustrated in FIG. 2a.
  • the shuttle 9 is provided with conical tapers or rounded edges-22 at each end.
  • the lateral shuttle sections 23 are primarily used for electromagnetic shuttle acceleration,anddeceleration and for thislpurpose they tixe dly arranged in the shed, in which case the dents of consist of an electrically highlyconductive material, for
  • FIG. 6. shows the guide achieved with the shuttle cross-sections shown in" FIG. 1
  • the guide lamellae can also be dey signed to beatu p the weft threa'dQ due to friction- 2 and which canbe seen particularly clearly-from FIGS.-
  • asynchronous linear motor which is arranged outside the warp or shed in the direction of entry.
  • the shuttle is guided as required inside the linear motor and either over a part of or over the entire length of the shuttle trajectory through the shed.
  • the shuttle is used as a linear squirrel-cage rotor, in which case the magnetic travelling field is preferably generated by 3-phase alternating current.
  • the useful load determined by the thread gripper or storage unit and the useful volume of the shuttle are kept relatively low. In this way, it is possible to apply this useful load to the shuttle in such a way that it does not interfere to any appreciable extent with the drive mechanism in the air gap of the linear motor.
  • the individual gripper shuttles can be controlled in the frequency with which they are used in such a way that intermediate cooling is possible.
  • the stators 2 and 5 can be wound cylindrically in the same way as tubular linear motors. This has the advantage of structural simplicity and of reducing electrical line losses.
  • the interrupted hollow form of the shuttles 9 and 10 provides for easy access to the shuttle guide beam.
  • FIG. 7 shows this method of winding on part of the accelerator stator 2.
  • some of the stator 2 which consists largely of iron, has been cut away.
  • the cylindrical coils 28 are accommodated in grooves 27 in the stator 2 and also extend through the support 17.
  • guide lamellae fixed to the sley it is also possible to use guide lamellae whose movement is controlled by means of a separate drive shaft.
  • guide lamellae whose movement is controlled by means of a separate drive shaft.
  • they can also be The brake arrangements known from conventional shuttle ,weaving machines can. be combined with a lin- -ear motor. designed to function as an accelerator.
  • Weft insertion system for weaving looms comprismg:
  • a gripper shuttle (9, 10) of electrically conductive non-magnetic material
  • weaving shuttle is in the form of an elongated, thinwalled element having a surface which partially surrounds the shuttle guide (7).
  • a stator (2) of the asynchronous linear motor (1) is provided with ring-shaped windings (28) arranged in annular grooves (27) in the stator in planes perpendicular to the direction in which the weft thread is to be introduced.
  • guide beam (3) comprises an extension (11) arranged on the entry side of the asynchronous linear motor (1).
  • a weft insertion systems for weaving looms comprising:
  • weaving shuttle is in the form of an elongated, thinwalled element having a surface which partially sur rounds the shuttle guide (7 15.
  • weaving shuttle consists essentially of aluminum.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US463450A 1973-04-27 1974-04-24 Weft insertion system for weaving looms Expired - Lifetime US3902535A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH609473A CH559794A5 (cs) 1973-04-27 1973-04-27

Publications (1)

Publication Number Publication Date
US3902535A true US3902535A (en) 1975-09-02

Family

ID=4304170

Family Applications (1)

Application Number Title Priority Date Filing Date
US463450A Expired - Lifetime US3902535A (en) 1973-04-27 1974-04-24 Weft insertion system for weaving looms

Country Status (5)

Country Link
US (1) US3902535A (cs)
JP (1) JPS5013664A (cs)
CH (1) CH559794A5 (cs)
CS (1) CS174241B2 (cs)
DE (1) DE2420433A1 (cs)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4624287A (en) * 1984-06-26 1986-11-25 Isaak Kakilashvili Shuttle unit of a loom
US4762153A (en) * 1987-01-15 1988-08-09 Chuang Wu Chen Weaving loom with magnetic shuttle
US4834146A (en) * 1986-12-23 1989-05-30 Vamatex S.P.A. Means to guide the motion of a pair of weft carrying grippers inside the shed of weaving looms
WO2005098109A1 (en) * 2004-04-07 2005-10-20 Rohit Verma Electromagnetic weaving machine
WO2007039244A2 (de) * 2005-10-01 2007-04-12 Sultex Ag Verfahren zur abstützung eines schussfadenführungselements
US20080105326A1 (en) * 2006-11-02 2008-05-08 Sultex Ag Method and apparatus for the insertion of a weft thread
US20150027583A1 (en) * 2013-07-24 2015-01-29 Schonherr Textilmaschinenbau Gmbh Weft insertion system and weaving machine comprising such a system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63112751A (ja) * 1986-10-24 1988-05-17 株式会社豊田自動織機製作所 リニアモ−タを利用した織機における緯入れ方法
DE10154940A1 (de) * 2001-11-08 2003-06-05 Dornier Gmbh Lindauer Elektromotorischer Direktantrieb für Tragorgane der Schussfadengreifer einer Webmaschine
DE10154817C1 (de) * 2001-11-08 2003-10-02 Dornier Gmbh Lindauer Elektromotorischer Direktantrieb für die Tragorgane der Schussfadengreifer einer Webmaschine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3179867A (en) * 1965-04-20 Electric -driver for driving the woof-carrying unit of a loom
US3335300A (en) * 1964-08-27 1967-08-08 Vb Res & Dev Linear induction motor
US3376441A (en) * 1965-07-22 1968-04-02 Skinner Prec Ind Inc Linear induction motor actuator with electromagnetic detent

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3179867A (en) * 1965-04-20 Electric -driver for driving the woof-carrying unit of a loom
US3335300A (en) * 1964-08-27 1967-08-08 Vb Res & Dev Linear induction motor
US3376441A (en) * 1965-07-22 1968-04-02 Skinner Prec Ind Inc Linear induction motor actuator with electromagnetic detent

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4624287A (en) * 1984-06-26 1986-11-25 Isaak Kakilashvili Shuttle unit of a loom
US4834146A (en) * 1986-12-23 1989-05-30 Vamatex S.P.A. Means to guide the motion of a pair of weft carrying grippers inside the shed of weaving looms
US4762153A (en) * 1987-01-15 1988-08-09 Chuang Wu Chen Weaving loom with magnetic shuttle
WO2005098109A1 (en) * 2004-04-07 2005-10-20 Rohit Verma Electromagnetic weaving machine
WO2007039244A3 (de) * 2005-10-01 2007-10-11 Markus Farner Verfahren zur abstützung eines schussfadenführungselements
EP1777330A1 (de) * 2005-10-01 2007-04-25 Markus Farner Verfahren zur Abstützung eines Schussfadenführungselements
WO2007039244A2 (de) * 2005-10-01 2007-04-12 Sultex Ag Verfahren zur abstützung eines schussfadenführungselements
US20080105326A1 (en) * 2006-11-02 2008-05-08 Sultex Ag Method and apparatus for the insertion of a weft thread
US7584769B2 (en) * 2006-11-02 2009-09-08 Sultex Ag Method and apparatus for the insertion of a weft thread
US20150027583A1 (en) * 2013-07-24 2015-01-29 Schonherr Textilmaschinenbau Gmbh Weft insertion system and weaving machine comprising such a system
KR20150012210A (ko) * 2013-07-24 2015-02-03 숀헤르 텍스틸마쉬넨바우 게엠베하 위사 삽입 시스템 및 그러한 시스템을 포함하는 제직기
CN104342825A (zh) * 2013-07-24 2015-02-11 圣豪纺织机械有限公司 引纬系统及包括该系统的纺织机
US9359700B2 (en) * 2013-07-24 2016-06-07 Schonherr Textilmaschinenbau Gmbh Weft insertion system and weaving machine comprising such a system
CN104342825B (zh) * 2013-07-24 2018-01-26 史陶比尔拜罗伊特股份有限公司 引纬系统及包括该系统的纺织机
KR102208516B1 (ko) 2013-07-24 2021-01-27 숀헤르 텍스틸마쉬넨바우 게엠베하 위사 삽입 시스템 및 그러한 시스템을 포함하는 제직기

Also Published As

Publication number Publication date
JPS5013664A (cs) 1975-02-13
DE2420433A1 (de) 1974-11-07
CS174241B2 (cs) 1977-03-31
CH559794A5 (cs) 1975-03-14

Similar Documents

Publication Publication Date Title
US3902535A (en) Weft insertion system for weaving looms
US3891874A (en) Compensated reciprocating electrodynamic machine
CN106544777B (zh) 一种电磁驱动的悬浮式片梭引纬方法及装置
US3618640A (en) Magnetic shuttle drive for continuously progressing sheds in weaving looms
JP2016194184A (ja) プロジェクタイル織機に横糸を挿入するための電磁装置
US5225726A (en) Linear synchronous motor having enhanced levitational forces
US2845093A (en) Method of and means for weaving
US3828686A (en) Magnetic guide for a railway vehicle
Laithwaite et al. A self-oscillating induction motor for shuttle propulsion
CA1219191A (en) Weft insertion apparatus for flat weaving power looms equipped with a gripper shuttle
US2203568A (en) Magnetic shuttle motion
US3820472A (en) Two sided linear induction motor especially for suspended vehicles
WO2021047157A1 (zh) 一种变磁阻磁悬浮引纬装置
US4762153A (en) Weaving loom with magnetic shuttle
KR0172096B1 (ko) 직기용 위사 안내장치
CS207821B1 (en) Appliance for transport of the weft insertors,mainly for the multished looms
US4126159A (en) Apparatus and method for stabilizing rapiers
CN111676574B (zh) 一种纺织机
US3543807A (en) Process for the insertion of the weft in a loom
Laithwaite et al. Electromagnetic shuttle-propelling devices
JPS5971461A (ja) 織機のリニアモ−タ−によるヨコ糸入れ方法および装置
BE1010389A3 (nl) Draadrem voor het remmen van een inslagdraad bij een weefmachine.
US3889723A (en) Weaving machine comprising shuttle braking means
CN112593332A (zh) 用于超宽幅片梭织机的片梭投射制止装置和方法
US2036252A (en) Electro-dynamic apparatus