EP0644961B1 - Verfahren und vorrichtung zum liefern von schussfäden - Google Patents

Verfahren und vorrichtung zum liefern von schussfäden Download PDF

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Publication number
EP0644961B1
EP0644961B1 EP93912955A EP93912955A EP0644961B1 EP 0644961 B1 EP0644961 B1 EP 0644961B1 EP 93912955 A EP93912955 A EP 93912955A EP 93912955 A EP93912955 A EP 93912955A EP 0644961 B1 EP0644961 B1 EP 0644961B1
Authority
EP
European Patent Office
Prior art keywords
storage drum
retention element
weft
take
rotary drive
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
EP93912955A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0644961A1 (de
Inventor
Lars Helge Gottfrid Tholander
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.)
Iro AB
Original Assignee
Iro AB
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 Iro AB filed Critical Iro AB
Publication of EP0644961A1 publication Critical patent/EP0644961A1/de
Application granted granted Critical
Publication of EP0644961B1 publication Critical patent/EP0644961B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins
    • D03D47/363—Construction or control of the yarn retaining devices

Definitions

  • the invention relates to a method according to the preamble of claim 1 and an apparatus for performing the method according to the preamble of claim 2.
  • a radially adjustable retaining element which can be driven in the circumferential direction of the stationary storage drum is used to precisely measure the weft thread length and to brake the weft thread at the entry end.
  • the retaining member which is at a predetermined circumferential position of the storage drum is disengaged, so that when the weft thread is drawn off, the take-off point rotates at a rapidly increasing speed.
  • the disengaged retaining element is accelerated in the direction of rotation to a speed which approximately corresponds to the speed of rotation of the trigger point.
  • the trigger point first runs through under the disengaged retaining element. Then the retention element is engaged.
  • the weft thread runs onto the retention element at the take-off point and is delayed to a new predetermined circumferential position until it comes to a standstill with the retention element engaged.
  • the retaining element contained in an armature with an actuating magnet has a relatively large mass, which creates problems when accelerating and decelerating. Timely control of the actuating magnet during the rotational movement of the retaining element is difficult. Stopping the engaged retaining element is difficult because of the large masses to be decelerated, so that the braking process takes a relatively long time. This adversely affects the entry process in the weaving machine because the delay phase extends over a relatively long time.
  • the radially adjustable retaining element is rotated in the circumferential direction of the storage drum as soon as the retaining element is disengaged in order to precisely measure the weft thread length.
  • the retaining element is re-engaged after the last permissible passage of the take-off point, so that the weft thread is reliably intercepted.
  • the retaining element does not influence the weft withdrawal movement.
  • the weft is stopped abruptly.
  • the storage drum is stationary.
  • both the storage drum and the retaining element are driven in rotation.
  • the retaining element can additionally be moved back and forth between an engagement position in which it blocks the orbit of the withdrawal point and a release position.
  • a switch is made between a compulsory delivery and a free delivery of the thread.
  • a stationary storage drum is assigned a rotatable thread guide element which can be driven to rotate about the storage drum axis and is designed such that the withdrawal point of the thread can overtake the thread guide element under certain conditions (free delivery), while in the case of forced delivery the peripheral speed of the thread guide element is the one supplied Thread quantity determined per unit of time.
  • the weft thread which is measured by a measuring supplier by means of a radially adjustable retaining element, is fed to the input device by an automatically driven positive delivery device arranged downstream of the storage drum.
  • the compulsory delivery is interrupted during the entry, so that the entry device continues to convey the weft thread to a standstill.
  • the invention has for its object to provide a method and a device of the type mentioned, with which the entry process can be optimized on the one hand for the weaving machine and on the other hand as gentle as possible for the weft thread, the entry process even from one weft to the other should be modular.
  • the weft length should be precisely measurable for jet looms.
  • the draw-off process should be able to be coordinated with an optimized entry.
  • the weft thread is never left to itself during the weft, but is constantly forcibly delivered. Due to the compulsory delivery, he must follow a speed profile that is carefully designed for him and is tailored to an optimal entry for the weaving machine. This avoids harmful tension changes in the weft. There is no sudden and critical acceleration and jerky deceleration. Since the speed profile is predetermined, the drive of the input device can be set precisely to the forced delivery, which saves drive energy, for example compressed air, because it is no longer necessary to work with excess drive energy as before. In jet looms, the weft thread length required is precisely measured by the monitored angular position of the retaining element.
  • the speed profile is tailored precisely to the working behavior in the weaving machine, especially in the transfer phase, so that harmful tension variations in the weft thread are avoided.
  • the retaining element and its rotary drive have as little mass as possible so that it can be accelerated and decelerated sufficiently quickly.
  • the low-mass design of the retaining element is possible in that it constantly engages in the orbit and does not require any additional actuating device for radial adjustment.
  • Monitoring the angular position of the retaining element in relation to the storage drum is important in order on the one hand to precisely control the desired speed profile and on the other hand - if this is necessary - to be able to precisely measure the weft thread length.
  • the forced delivery is carried out cheaply without a mechanically loading conveyor roller gap, because there is contact with the retaining element only negligible effects.
  • the storage drum is stationary; the retaining element moves relative to the storage drum.
  • the rotary drive of the retaining element is responsible for the desired speed profile during the shot.
  • the embodiment according to claim 4 is advantageous, in which the storage drum is also driven in rotation and at the same time forms the winding device.
  • This has the advantage of particularly favorable feed conditions for the weft thread to the weft thread supply on the storage drum, because a straight tangential feed that is gentle on the weft thread is possible and the operational disturbances on the feed side are reduced to a minimum.
  • the draw-off conditions (balloon formation) are also improved in this embodiment because the rotating storage drum delivers the weft thread with less resistance since the weft thread supply rotates.
  • the speed profile which determines the course of the entry, is derived from the speed ratios between the rotational movement of the storage drum and the rotational movement of the retaining element, it being favorable that the retaining element no longer needs to be accelerated so much relative to the storage drum because the weft thread supply already has a certain one Has basic speed that can be used for the entry.
  • both the inflow and the take-off conditions for the weft thread are favorable with regard to small deflections, barely noticeable changes in thread tension and a stabilized thread take-off.
  • the embodiment according to claim is also expedient 5.
  • a unidirectional rotary drive is sufficient to achieve the desired speed profile, a drive motor with a high acceleration and deceleration capability being expedient, which can be operated sufficiently small due to the low-mass smoke element, yet can be operated efficiently and with little loss.
  • the rotary drive can expediently be reversed in the direction of rotation in order to be able to precisely control the deceleration phase. If necessary, a rapidly decelerable or decelerable drive motor with a drive device is sufficient.
  • the pointer is extremely low-mass for the forced delivery. It can be quickly accelerated and decelerated again. The weft cannot overtake the pointer. The speed of the weft is precisely controlled by the pointer.
  • the necessary Accelerations and decelerations achieved without any problems the rotary angle decoder or the stepping motor permanently permitting the control device to determine the exact angular position of the retaining element in relation to the circumference of the storage drum and to take it into account in the control.
  • the acceleration phase is of particular importance for the desired speed profile in order to accelerate the weft thread to the maximum insertion speed as quickly as possible.
  • the booster supports the rotary drive in the acceleration and / or the equally important deceleration phase. It is important that the control device does not lose control of the movement of the retaining element, but that the booster compensates or eliminates mechanical inertia effects.
  • the booster engages directly on the retaining element or on its drive shaft and helps the rotary drive to provide the necessary acceleration and / or deceleration.
  • a structurally simple, reliable and low-mass embodiment is also apparent from claim 12.
  • the turbine wheel is used for acceleration and / or deceleration of the retaining element from at least one compressed air nozzle.
  • the turbine wheel can be uncoupled from the pointer via a freewheel if it only needs to work in one direction of rotation.
  • the control device is constantly informed about the exact angular position of the holding element.
  • the booster is only a tool that provides the drive motor with additional drive energy (for deceleration and / or acceleration), so to speak, without actively intervening in the control system.
  • This has the advantage of a small-sized, low-mass and therefore quickly responsive drive motor, which would otherwise have to be much larger for the desired acceleration and / or deceleration behavior without a booster and thus be designed with more harmful mass.
  • Another useful embodiment is set out in claim 14. Especially when the storage drum is at a standstill, the signals to and from the drive motor and the supply voltage are transmitted without contact. However, this can also be advantageous for a rotatable storage drum.
  • the embodiment according to claim 15 is advantageous because with the programmable microprocessor the desired speed profile can be precisely controlled, varied, modulated and repeated.
  • the control device can be supplied with information from the weaving machine and / or from the control device of the supplier in order to be able to match the individual parameters exactly to one another.
  • the speed profile will changed from one entry to the other, if necessary, or just the thread length that was supplied.
  • the pointer is arranged in a rotor which is driven from the outside. This simplifies the mechanical structure of the device, especially in the case of a stationary storage drum.
  • the ring ensures the forced delivery of the weft.
  • the point of contact between the ring and the storage drum circumference revolves in front of the withdrawal point. A small eccentricity is sufficient for the desired effect.
  • the ring also has balloon-reducing properties.
  • the mechanical construction of the rotary drive is simple and reliable.
  • the embodiment according to claim 18 is expedient, in which the ring takes on a balloon-limiting function and forms the retaining element during its tumbling movement.
  • a feeder F for supplying a weft Y is provided on one side of a weaving machine W.
  • the feeder F draws the weft Y from a supply spool (not shown) and winds it with a winding device 2, which contains a winding element 10, tangentially in turns into a weft supply V on the circumference of a storage drum 1.
  • An insertion device E of the weaving machine W pulls the weft overhead of the storage drum out of the weft supply V and brings it into the shed S.
  • the insertion device E is either a main nozzle (air jet weaving machine), the Auxiliary nozzles, not shown, are assigned within the compartment, or for example a rapier of a rapier weaving machine.
  • the storage drum 1 of the supplier is at a standstill.
  • the winding device 2 is driven by means of a drive 3 and by a control device 4 via a control device part 5 in such a way that a certain supply size is always available.
  • the weft Y is automatically delivered with each weft.
  • a retaining element R in the form of a radial pointer 7 is provided, which is arranged on a drive shaft 6 which is coaxial with the storage drum axis 11 and (see FIG. 2) the orbit U of the take-off point of the weft thread Y continuously over the front edge of the storage drum 1 enforced.
  • a separate rotary drive A (indicated by dashed lines in the interior of the storage drum 1) is provided for the retaining element R and controls a specific speed profile of the pointer 7 via a control device 8.
  • the winding device 2 winds up the weft thread in the direction of an arrow 2 'on the storage drum 1.
  • the take-off point of the weft thread Y rotates in an orbit U in the direction of the arrow 2 '.
  • the retaining element R is in the direction of rotation 2 'before the withdrawal point.
  • the restraining element R accelerates in the direction of an arrow 6 'from a first angular position from standstill and at the end of the shot decelerates to a second predetermined angular position to standstill.
  • Fig. 3 illustrates a speed profile I that determines the withdrawal process.
  • the take-off speed v is on the vertical axis; time Z is plotted on the horizontal axis.
  • the speed profile I is characterized by an acceleration section a, a high-speed section b and a subsequent deceleration section c.
  • the retaining element R is driven in the direction of the arrow 6 'exactly according to the speed profile I according to FIG. 3, so that the weft thread Y is forcibly delivered and entered by the input device E.
  • the speed profile I belongs, for example, to an air jet loom.
  • Fig. 3 illustrates the speed profile I of a rapier-less rapier weaving machine in which the weft thread is passed approximately in the middle of the compartment S. 4 is characterized by a first acceleration phase a1, a subsequent high-speed phase b1, a subsequent first deceleration phase c1, a second acceleration phase a2, a subsequent second high-speed phase b2 and a final deceleration phase c2.
  • the retaining element R is driven according to the speed profile I of FIG. 4, so that the weft thread is forcibly delivered during the entire weft.
  • the retaining element R as a pointer 7 is low in mass and therefore can be decelerated and accelerated with a small-sized, responsive electric motor.
  • the electric motor is either provided with a rotation angle decoder, not shown, which transmits the respective angular position of the pointer 7 in relation to the circumference of the storage drum 1 of the control device 8, or is designed as a stepper motor, the respective angular position of which the control device knows anyway.
  • the storage drum 1 of the feeder F can be driven to rotate about its axis 11.
  • a peripheral flange 13 is designed as a support for a drive belt 12, which is connected to the drive 3.
  • the weft Y is fed tangentially without deflection and introduced into the supply V.
  • the storage drum 1 is rotatably mounted on a holding tube 15 of a stationary holder 14.
  • the rotary drive A for the retaining element R (pointer 7) is arranged on the holding tube 15, such that the drive shaft 6 protrudes from the front end of the storage drum 1 and carries the pointer 7.
  • the control device 8, which expediently contains a programmable microprocessor, is connected to the rotary drive A by the holding tube 15.
  • the storage drum 1 rotates in the direction of an arrow 1 '.
  • the take-off point of the weft thread Y (counterclockwise) moves in the direction of arrow 2 'along the front edge of the storage drum 1.
  • the storage drum 1 simultaneously forms the take-up device to supplement the supply V.
  • the pointer 7 rotates synchronously with the storage drum 1.
  • the pointer 7 is initially accelerated counterclockwise to a higher speed than the peripheral speed of the storage drum 1 in the direction of arrow 6 ', and is delayed or reversed at the end of the entry in the direction of arrow 6 "until after the entry rotates again at the same peripheral speed and in the same direction as the storage drum 1.
  • FIG. 7 illustrates the work of the feeder F according to FIG. 5 for an air jet loom.
  • the speed profile I corresponds to the speed profile I of FIG. 3 and represents the speed of the weft thread when weft.
  • the horizontal line 1 represents a constant speed of the storage drum 1 assumed for the sake of simplicity.
  • the retaining element R rotates at this speed until the start of the entry.
  • the retaining element R is accelerated counter to the direction of rotation of the storage drum 1, runs at a relatively constant speed during the high-speed phase b and is then decelerated again relative to the storage drum 1 or reversed in the opposite direction until the speed of the storage drum 1 is reached again.
  • the speed of the storage drum 1 is shown constant. However, it is also possible to vary the speed of the storage drum 1.
  • the retaining element R is a radially inwardly projecting pointer 7 on an oblique arm 16, which is seated on a hollow drive shaft 17, which is spaced from the front end of the storage drum 1 e.g. is mounted in the rotary drive A and forms a withdrawal eye for the weft Y.
  • the retaining element is fastened as a radially inwardly projecting pointer to an annular rotor 18 which engages around the front end of the storage drum 1 and is seated in a drive bearing 19 of the rotary drive A.
  • the rotary drive A is arranged externally of the storage drum 1.
  • the retaining element R is a ring 19 which is arranged perpendicular to the storage drum axis 11 at the front end of the storage drum 1 and has an inner diameter 20 which is larger than the outer diameter of the storage drum 1.
  • the center 22 of the ring 19 is arranged eccentrically to the storage drum axis 11 and rotatably mounted on a crank rotary drive A, 24 indicated by a broken line.
  • the crank drive 24 rotates about the storage drum axis 11, a point of contact between the inner circumference 20 and the storage drum 1 rotating in the circumferential direction of the take-off point of the weft yarn Y in front of the take-off point.
  • the inner circumference 20 is equipped with a circumferential toothing 21 which cooperates with corresponding recesses on the storage drum 1.
  • the retaining element R is a ring 25, the inside diameter of which is larger than the outside diameter of the storage drum 1.
  • the ring 25 is inclined with an adjusting axis 27 which intersects the storage drum axis 11 and is fastened to a hollow drive shaft 26 on which the rotary drive A attacks.
  • the ring 25 executes a wobbling movement with a rotating contact point with the front edge of the storage drum 1.
  • FIG. 12 shows an embodiment of the rotary drive A for the retaining element R designed as a pointer 7.
  • the electric motor M drives the drive shaft 6.
  • the drive shaft 6 is assigned a booster B, which is preferably temporarily activated for the acceleration and / or deceleration phases a, c, a1, a2, c1, c2 in order to support the electric motor M.
  • the booster B has a turbine wheel 28 on the drive shaft 6.
  • the turbine wheel 28 carries turbine blades 29, to which compressed air nozzles 30, 31 are aligned.
  • a disk 32 is fastened, which carries rotary encoder 33, are aligned with the rotary angle sensors 34, which transmit the signals to the control device 8, so that the Control device 8 is constantly informed about the angular position of the pointer 7.
  • the booster could also be driven mechanically via a flywheel, electromagnetically or by eddy current. It is important that the control device controls the rotational position of the pointer 7 despite the intervention of the booster when accelerating or decelerating cannot lose, even if the booster creates an acceleration or deceleration characteristic for the drive shaft that the electric motor M itself cannot control.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Forwarding And Storing Of Filamentary Material (AREA)
EP93912955A 1992-06-12 1993-06-11 Verfahren und vorrichtung zum liefern von schussfäden Expired - Lifetime EP0644961B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4219306A DE4219306A1 (de) 1992-06-12 1992-06-12 Verfahren und Vorrichtung zum Liefern von Schußfäden
DE4219306 1992-06-12
PCT/EP1993/001485 WO1993025742A1 (de) 1992-06-12 1993-06-11 Verfahren und vorrichtung zum liefern von schussfäden

Publications (2)

Publication Number Publication Date
EP0644961A1 EP0644961A1 (de) 1995-03-29
EP0644961B1 true EP0644961B1 (de) 1996-09-11

Family

ID=6460909

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93912955A Expired - Lifetime EP0644961B1 (de) 1992-06-12 1993-06-11 Verfahren und vorrichtung zum liefern von schussfäden

Country Status (7)

Country Link
US (1) US5509450A (cs)
EP (1) EP0644961B1 (cs)
JP (1) JPH07508563A (cs)
KR (1) KR100277802B1 (cs)
CZ (1) CZ283295B6 (cs)
DE (2) DE4219306A1 (cs)
WO (1) WO1993025742A1 (cs)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9400248D0 (sv) * 1994-01-26 1994-01-26 Iro Ab Styrbar utgångsbroms för garnmatningsanordning till textilmaskiner, i synnerhet vävmaskiner av projektil eller gripar-typ
EP0699790B1 (en) * 1994-07-19 2000-01-19 L.G.L. ELECTRONICS S.p.A. Thread arrester for weft feeders for air-jet looms
NL9402159A (nl) * 1994-12-20 1996-08-01 Te Strake Bv Inrichting voor het sturen van een garenloop en vrijgavemiddelen voor toepassing in de inrichting.
DE102005010534A1 (de) * 2005-03-04 2006-09-07 Ontec Elektro- Und Steuerungstechnik Gmbh Schussfadenzuführvorrichtung für Webmaschinen, insbesondere Greiferwebmaschinen
ITMI20060311A1 (it) * 2006-02-21 2007-08-22 Btsr Int Spa Dispositivo perfezionato di alimentazione di filo o filatio ad una macchina tessile e metodo per attuare tale alimentazione
EP2058423A1 (en) * 2007-10-10 2009-05-13 Iro Ab Weaving machine, yarn feeder and method for inserting a weft yarn
WO2024128950A1 (en) 2022-12-14 2024-06-20 Vandewiele Sweden Ab Yarn feeder especially for heavy yarns

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5891849A (ja) * 1981-11-25 1983-05-31 株式会社豊田中央研究所 ジエツトル−ム用緯糸貯留装置
FR2548693B1 (fr) * 1983-07-07 1985-10-18 Saurer Diederichs Sa Dispositif d'entrainement en rotation pour predelivreur-mesureur de trame, sur une machine a tisser sans navette
JPS6028552A (ja) * 1983-07-25 1985-02-13 日産自動車株式会社 緯糸測長装置の測長量調整装置
SE8505788D0 (sv) * 1985-12-06 1985-12-06 Iro Ab Anordning for garnmatning, foretredesvis vid maskiner med intermittenta garnforlopp, speciellt flatstickmaskiner
CH669621A5 (cs) * 1986-04-29 1989-03-31 Sulzer Ag
EP0253760B1 (de) * 1986-07-15 1991-11-27 GebràœDer Sulzer Aktiengesellschaft Verfahren für den Betrieb eines Schussfadenspeichers für eine Webmaschine
JP3134879B2 (ja) * 1990-09-27 2001-02-13 津田駒工業株式会社 流体噴射式織機の積極フィードよこ入れ装置
DE4116497B4 (de) * 1991-05-21 2006-10-19 Sipra Patententwicklungs- Und Beteiligungsgesellschaft Mbh Fadenliefervorrichtung

Also Published As

Publication number Publication date
US5509450A (en) 1996-04-23
JPH07508563A (ja) 1995-09-21
CZ283295B6 (cs) 1998-02-18
DE4219306A1 (de) 1993-12-16
KR100277802B1 (ko) 2001-03-02
CZ311994A3 (en) 1995-04-12
KR950701994A (ko) 1995-05-17
DE59303776D1 (de) 1996-10-17
EP0644961A1 (de) 1995-03-29
WO1993025742A1 (de) 1993-12-23

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