EP0644961A1 - Method and device for feeding weft yarn. - Google Patents
Method and device for feeding weft yarn.Info
- Publication number
- EP0644961A1 EP0644961A1 EP93912955A EP93912955A EP0644961A1 EP 0644961 A1 EP0644961 A1 EP 0644961A1 EP 93912955 A EP93912955 A EP 93912955A EP 93912955 A EP93912955 A EP 93912955A EP 0644961 A1 EP0644961 A1 EP 0644961A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- storage drum
- retaining element
- rotary drive
- weft
- weft thread
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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 carrying out 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 corresponds approximately 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 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 trigger 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 guiding 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 guiding element under certain conditions (free delivery) , while in the case of the compulsory delivery the peripheral speed of the thread guiding element is the delivered one 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 conveys 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, while the entry process even from a weft on the other hand, it should be modulatable.
- 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. Because of the compulsory delivery, he has to follow a speed profile that is carefully designed for him and is coordinated with an entry that is optimal for the weaving machine. This avoids harmful tension changes in the weft. There is no sudden and critical acceleration and a sudden deceleration. Since the speed profile is predetermined, the drive of the input device can be adjusted exactly 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 precisely matched 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 conveyor roller gap mechanically stressing the weft thread, because the contact with the retention element has a negligible effect.
- 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 rotationally driven and at the same time forms the winding device.
- This has the advantage of particularly favorable feed conditions of the weft thread to the weft thread supply on the storage drum, because a straight and gentle tangential feed is possible, which reduces operational disturbances on the feed side 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 rotary movement of the storage drum and the rotary 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 exists has a certain basic speed that can be used for the entry.
- both the feed 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 drive motor with a high acceleration and deceleration capacity being expedient, which is sufficiently small owing to the low-mass smoke element , can still 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 drive motor that can be quickly braked or decelerated 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 drawn weft thread runs through the hollow drive shaft of the arm.
- This design variant is particularly suitable for a stationary storage drum, to which the weft thread runs centrally through the drive shaft before it is brought into the thread supply by the winding device.
- the rotary angle decoder or the stepper motor permanently enabling the control device to determine the exact angular position of the retaining element with respect to the storage drum circumference 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 deceleration phase, which is just as important. It is important, however, 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. tion 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 remains constantly informed about the exact angular position of the holding element.
- the booster is only an auxiliary device which, so to speak, provides the drive motor with additional drive energy (for deceleration and / or acceleration) without actively intervening in the control.
- This has the advantage of a small-sized, low-mass and therefore quickly responsive drive motor, which would otherwise have to be significantly larger for the desired acceleration and / or deceleration behavior without a booster and thus have a more harmful mass.
- a further, expedient form of filling can be found 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 the desired speed profile can be precisely controlled, varied, modulated and repeated using the programmable microprocessor.
- 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 contact point between the ring and the storage drum circumference runs 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.
- the permanent forced delivery with simultaneous weft length measurement in the case of an overhead take-off is of fundamental importance to the invention, especially for air jet looms.
- FIG. 1 schematically shows a device for supplying weft threads to a weaving machine
- 2 is an end view of part of the device of FIG. 1
- FIG. 5 is an end view of the device of FIG. 5,
- FIGS. 5 and 6 are diagrams of an embodiment of FIGS. 5 and 6,
- FIG. 12 shows a schematic perspective view of a further variant.
- a feeder F is provided on one side of a weaving machine W for delivering a weft yarn Y.
- the feeder F pulls the weft Y from a supply spool (not shown) and winds it with a winding device 2, which forms a winding element 10. holds 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), to which 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 stationary.
- 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 present.
- 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 coaxial with the storage drum axis 11 and (see FIG. 2) the orbit U of the take-off point of the weft thread Y over the the front edge of the storage drum 1 continuously penetrates.
- 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 the weft thread onto the storage drum 1 in the direction of an arrow 2 '.
- the take-off point of the weft Y runs in an orbit U in the direction of arrow 2 '.
- the retaining element R is in the direction of rotation 2 'before the withdrawal point.
- the ent R is accelerated in the direction of an arrow 6 'from a first angular position from standstill and at the end of the shot is decelerated 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 is inserted by the insertion 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.
- the speed profile I according to FIG. 4 is characterized by a first acceleration phase a1, a subsequent high-speed phase bl, a subsequent first deceleration phase cl, 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 formed as a support for a drive belt 12, which is connected to the drive 3.
- the weft Y is fed tangentially without deflection and is 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 the arrow 2 'along the front edge of the storage drum 1.
- the storage drum 1 simultaneously forms the take-up device for supplementing the supply V.
- the Pointer 7 syn- chronically 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 the arrow 6 ', and at the end of the entry in the direction of the arrow 6 " decelerated or reversed until after the entry it 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 weaving machine.
- the speed profile I corresponds to the speed profile I of FIG. 3 and represents the speed of the weft thread during the 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 during the high-speed phase b at a relatively constant speed and is then decelerated again relative to the storage drum 1 or reversed in the opposite direction until the speed again the storage drum 1 is reached.
- 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 protruding pointer 7 on an oblique arm 16, which is seated on a hollow drive shaft 17, which is spaced apart 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 here 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 inside diameter 20 which is larger than the outside 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 dashed lines.
- 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 revolving in the direction of the take-off point of the weft thread Y in front of the take-off point.
- the inner circumference 20 is equipped with 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 acts.
- the drive shaft 26 rotates, 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, al, a2, cl, 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 attached, which carries rotary angle sensors 33, to which rotary angle sensors 34, which transmit the signals to the control device 8, are aligned , 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 produces an acceleration or deceleration characteristic for the drive shaft which the electric motor M itself cannot control.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
- Forwarding And Storing Of Filamentary Material (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4219306 | 1992-06-12 | ||
DE4219306A DE4219306A1 (en) | 1992-06-12 | 1992-06-12 | Method and device for supplying weft threads |
PCT/EP1993/001485 WO1993025742A1 (en) | 1992-06-12 | 1993-06-11 | Method and device for feeding weft yarn |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0644961A1 true EP0644961A1 (en) | 1995-03-29 |
EP0644961B1 EP0644961B1 (en) | 1996-09-11 |
Family
ID=6460909
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93912955A Expired - Lifetime EP0644961B1 (en) | 1992-06-12 | 1993-06-11 | Method and device for feeding weft yarn |
Country Status (7)
Country | Link |
---|---|
US (1) | US5509450A (en) |
EP (1) | EP0644961B1 (en) |
JP (1) | JPH07508563A (en) |
KR (1) | KR100277802B1 (en) |
CZ (1) | CZ283295B6 (en) |
DE (2) | DE4219306A1 (en) |
WO (1) | WO1993025742A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE9400248D0 (en) * | 1994-01-26 | 1994-01-26 | Iro Ab | Controllable output brake for yarn feed device for textile machines, in particular projectile or gripper-type weaving machines |
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 (en) * | 1994-12-20 | 1996-08-01 | Te Strake Bv | Device for controlling a yarn run and release means for use in the device. |
DE102005010534A1 (en) * | 2005-03-04 | 2006-09-07 | Ontec Elektro- Und Steuerungstechnik Gmbh | Weft feeder for weaving machines, in particular rapier weaving machines |
ITMI20060311A1 (en) * | 2006-02-21 | 2007-08-22 | Btsr Int Spa | PERFECT DEVICE FOR WIRE OR FILATIO SUPPLY TO A TEXTILE MACHINE AND METHOD TO IMPLEMENT THIS POWER SUPPLY |
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5891849A (en) * | 1981-11-25 | 1983-05-31 | 株式会社豊田中央研究所 | Weft yarn storing apparatus for jet loom |
FR2548693B1 (en) * | 1983-07-07 | 1985-10-18 | Saurer Diederichs Sa | ROTATION DRIVE DEVICE FOR WEFT PREDIVER AND MEASURER ON A NON-SHUTTLE WEAVING MACHINE |
JPS6028552A (en) * | 1983-07-25 | 1985-02-13 | 日産自動車株式会社 | Length measuring and amount control apparatus of weft yarn length measuring apparatus |
SE8505788D0 (en) * | 1985-12-06 | 1985-12-06 | Iro Ab | YARN FEED DEVICE, PREFERRED TO MACHINES WITH INTERMITTENT YARN LOSS, SPECIAL FLAT STICKER MACHINES |
CH669621A5 (en) * | 1986-04-29 | 1989-03-31 | Sulzer Ag | |
EP0253760B1 (en) * | 1986-07-15 | 1991-11-27 | GebràDer Sulzer Aktiengesellschaft | Working method of a weft storing device for a weaving loom |
JP3134879B2 (en) * | 1990-09-27 | 2001-02-13 | 津田駒工業株式会社 | Positive feed weft insertion device for fluid jet loom |
DE4116497B4 (en) * | 1991-05-21 | 2006-10-19 | Sipra Patententwicklungs- Und Beteiligungsgesellschaft Mbh | Yarn feeding device |
-
1992
- 1992-06-12 DE DE4219306A patent/DE4219306A1/en not_active Withdrawn
-
1993
- 1993-06-11 WO PCT/EP1993/001485 patent/WO1993025742A1/en active IP Right Grant
- 1993-06-11 DE DE59303776T patent/DE59303776D1/en not_active Expired - Fee Related
- 1993-06-11 KR KR1019940704558A patent/KR100277802B1/en not_active IP Right Cessation
- 1993-06-11 CZ CZ943119A patent/CZ283295B6/en not_active IP Right Cessation
- 1993-06-11 EP EP93912955A patent/EP0644961B1/en not_active Expired - Lifetime
- 1993-06-11 JP JP6501126A patent/JPH07508563A/en active Pending
-
1995
- 1995-01-26 US US08/351,236 patent/US5509450A/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9325742A1 * |
Also Published As
Publication number | Publication date |
---|---|
US5509450A (en) | 1996-04-23 |
WO1993025742A1 (en) | 1993-12-23 |
EP0644961B1 (en) | 1996-09-11 |
JPH07508563A (en) | 1995-09-21 |
KR100277802B1 (en) | 2001-03-02 |
CZ311994A3 (en) | 1995-04-12 |
KR950701994A (en) | 1995-05-17 |
DE4219306A1 (en) | 1993-12-16 |
CZ283295B6 (en) | 1998-02-18 |
DE59303776D1 (en) | 1996-10-17 |
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