EP1141456A1 - Yarn processing system and method for delivering weft yarns - Google Patents
Yarn processing system and method for delivering weft yarnsInfo
- Publication number
- EP1141456A1 EP1141456A1 EP99964602A EP99964602A EP1141456A1 EP 1141456 A1 EP1141456 A1 EP 1141456A1 EP 99964602 A EP99964602 A EP 99964602A EP 99964602 A EP99964602 A EP 99964602A EP 1141456 A1 EP1141456 A1 EP 1141456A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- thread
- signal
- tensiometer
- weft
- brake
- 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
- D03D47/34—Handling the weft between bulk storage and weft-inserting means
Definitions
- the invention relates to a thread processing system according to the preamble of patent claim 1 and a method for supplying weft threads according to the preamble of patent claim 8.
- the braking effect of the thread brake at the beginning and at the end of the entry must be increased and eliminated as far as possible in the intermediate phase.
- an increased braking effect of the thread brake is advisable only towards the end of the entry, e.g. to mitigate the effects of the dreaded stretching or whipping.
- the braking effect is varied in a closed control loop via the thread brake during an insertion process by means of the signal representing the thread tension.
- Different positions of the thread end within the shed result in different thread tension values so that the thread tension curve is adapted to the weaving conditions. Since the tension curve already created by the pulling movement of the weft caused by the weaving machine can vary not only with the same thread material between the insertion processes, but also which also depends on other influences, it has proven to be useful not to work with a strictly defined course of the braking effect of the thread brake, but to control the thread brake taking into account the actual thread tension curve.
- the tensiometer the probe of which is in direct contact with the weft thread, delivers, so to speak, in real time signals representing the actual thread tension or a signal curve representing the thread tension curve. With this actual signal, the signal evaluation device then uses the thread brake to control a desired thread tension curve, the control loop of the tensiometer, the signal evaluation device and the thread brake being closed via the thread itself.
- the permanent mechanical contact between the weft thread and the probe of the tensiometer results in a problem which affects the control accuracy, due to a stretch tension prevailing between the delivery device and the insertion device of the weaving machine, also during the pauses between insertion processes.
- This tensile stress generates a signal with a certain signal value via the tensiometer, which can drift due to external circumstances.
- operational vibrations in such a thread processing system naturally also influence the tensioned weft thread and are felt by the tensiometer, so that the signal develops a drift tendency even when the weft thread is at rest.
- the signal evaluation device is unable to take into account a predetermined or fixed signal value as a reference in the control. In other words, reliable calibration or resetting cannot be done; preferably to zero, as would be required for high control accuracy.
- a thread processing system is known from US-A-5 476 122, in which a multi-disc thread brake is regulated in a closed control circuit with the aid of the signal of a tensiometer.
- FIG. 2 of this publication shows that there is a tension tension in the weft thread during the pauses between insertion processes, and that this tension tension can have different values in the two pauses shown (drifting). Since there is no thread tension at any time, no reliable calibration or reset can be carried out.
- the invention has for its object to design a thread processing system in a structurally simple manner so that the control accuracy of the thread brake control is high, or to specify a method with which the control accuracy for the thread tension is improved in a thread processing system.
- a constant reference value namely a thread tension zero signal
- the signal evaluation device is present because the tensiometer then either delivers no signal at all or always delivers the same basic signal. Calibration and resetting can be carried out easily and, above all, very reliably.
- the meaningful thread tension zero signal for the signal evaluation device is deliberately made by the calibration.
- the control accuracy can be increased with little structural effort.
- the separating device can be passive during the actual control process and then has no influence on the weft thread.
- the separating device is actuated by means of an adjusting drive which is expediently connected to a control device.
- a signal is transmitted to the signal evaluation device so that it takes into account the thread tension zero signal as a reference for calibration or resetting.
- the weft is lifted by the probe of the tensiometer.
- the ventilation element that carries out the separation only works for those Calibration on the weft thread, which is expedient anyway, no longer influences the thread path later.
- the probe or tensiometer itself is adjusted relative to the weft thread in the passive position and thus separated from the thread with the separating device.
- the venting element is a thread deflector in the form of a rod or a thread eyelet.
- the adjusting drive is formed in a structurally simple manner and reliably by an electromagnet, an electric motor or a pneumatic cylinder.
- a calibration part for calibrating or resetting is included in the signal evaluation device, which takes into account the thread tension zero signal when the separation has taken place.
- calibration is carried out when the weft thread is inserted and / or is not braked anyway.
- a temporary separation is deliberately carried out between the weft thread and the scanning probe of the tensiometer in order to obtain a meaningful and clear thread tension zero signal with which the calibration is carried out.
- a thread processing system S in FIG. 1 has a thread delivery device F for a weaving machine L containing a weaving shed H (a rapier weaving machine, a projectile weaving machine or a jet weaving machine), the thread delivery device F pulling a weft yarn Y from a supply spool 1 by means of a rotary drive 2 temporarily stored in turns on a storage drum 3 and intermittently supplied to the weaving machine L.
- the rotary drive 2 is controlled via a control device C of the delivery device F.
- a controllable thread brake B of any type and downstream of it a tensiometer T are arranged, to which a separating device P is assigned.
- the thread brake B can be a multi-disc brake, a deflection brake, an air nozzle brake, a band brake or the like. Here it contains brake elements 4, at least one of which can be adjusted relative to the other by an actuator 5 in order to vary the braking effect for the weft Y.
- the tensiometer T touches the weft thread with a probe 7 which belongs to a converter 8 with which a signal f representing the thread tension can be generated.
- the weft thread Y can be supported on stationary thread guide elements 6 on both sides of the probe 7.
- the separating device P has a ventilation element 9, for. B. in rod form or as a thread eyelet or fork-shaped, which is coupled to an actuator 10 and transversely to the thread running direction between the passive position shown in solid lines and a separating position (shown in dashed lines) can be moved back and forth.
- the weft thread Y can be separated from the probe 7 of the tensiometer T by means of the release element 9. Then the converter 8 outputs a signal fO, ie a thread tension zero signal.
- the actuator 10 can be connected to a controller M.
- an electronic signal evaluation device G which can contain a calibration part K.
- An input part J can be assigned to the signal evaluation device G, by means of which certain parameters or control curves can be set, which can be fed as signal f1 to the signal evaluation device G or its calibration part K.
- the converter 8 of the tensiometer T is connected in a signal-transmitting manner to the calibrated K, and also the control M (or the actuator 10) of the separating device P.
- the control M can send a message d to the calibration part K to the respective position of the venting element 9 , preferably the separation position.
- the signal evaluation device E can also be connected to the control device C of the delivery device G and / or a drive R of the weaving machine L, which in turn can also be connected to the control device C.
- the control device C can also be connected to the controller M.
- Signals "a” can be transmitted from the drive R of the loom L to the control device C and / or the control M and / or the signal evaluation device G, the signals "a", for example, the respective angle of rotation or certain angle of rotation values of the main shaft of the loom L represent.
- Signals "a1” can be transmitted from the control device C to the control M and / or the signal evaluation device G, which signals "a1" represent, for example, the operating status of the delivery device.
- a signal b can be supplied from the signal evaluation device G to the actuator 5 of the thread brake B, which signal is a function of the signal f or / and f1, or is proportional to these, in order to control the thread brake B accordingly.
- the thread brake B, the signal evaluation device G and the tensiometer T form a closed loop via the weft thread Y itself, with which, taking into account the thread tension picked up, a thread tension curve is generated which, for example, is adapted to the weaving conditions in the weaving machine L, which Thread quality, fabric width etc.
- the tensiometer T can work in a piezoelectric, piezoresistive, triboelectric, capacitive way or with strain gauges, the signal f, which represents the thread tension, being derived from the loading force of the weft thread Y. If the separating device P is moved into the separating position, the probe 7 is no longer acted upon by the weft thread Y. A thread tension zero signal fO is emitted by the tensiometer T, with the aid of which the signal evaluation device G or its calibration part K can carry out a calibration or reset.
- the thread brake is to act in a controlled manner at the start of entry, in the transition phase and against the end of entry, but as little as possible in the intervening periods.
- the thread brake is to be adjusted during an entry.
- the thread brake should come into engagement in a controlled manner towards the end of the insertion process, for example in order to mitigate or eliminate a feared stretching stroke.
- the middle part of the diagram in Fig. 2 illustrates the energization of the thread brake B, i.e. the signal b (for example indicated by the current I).
- the lower part of the diagram shows the energization or control of the actuator 10, i.e. the signal c (for example in mV).
- the thread brake B is controlled with the signal b at the beginning of the entry, in the transition phase and towards the end of the entry, taking into account the signal f, in order to control a specific braking, a specific braking effect or a specific braking process.
- the signal c is generated in order to actuate the actuator 10 and the release element 9 to bring into the separation position.
- the weft Y is separated from the probe 7.
- the tensiometer T then generates a thread tension zero signal fO.
- the signal d is transmitted to the calibration part K, as a kind of confirmation that the signal now present is the thread tension zero signal fO. This does not have to mean that the electrical signal value is zero.
- This confirmation or a kind of message signal could also come from the controller C or the drive R.
- a calibration k or a reset preferably to a zero value k, is carried out in the signal evaluation device G or in its calibration part K, so that the signal device G can always take into account a reliable reference value for the subsequent regulation.
- the signal c disappears.
- the probe 7 comes into contact with the weft Y again.
- the thread brake B is again controlled taking into account the signal f, but after the calibration or reset that took place previously.
- the thread tension curve regulated by the thread brake B is different from that in FIG. 2.
- the calibration during breaks between entries is carried out in the same way as in FIG. 2.
- the release element 9 is a thread eyelet, a fork or a rod that deflects the weft Y between the two stationary thread guide members 6 so far from the web that a separation between the probe 7 and the weft Y takes place.
- the two stationary thread guide members 6 are not absolutely necessary.
- a movable thread eyelet 6 ′ or a movable thread guide element is provided in FIG. 3, which forms the release element 9 of the separating device P.
- the steep drive 10 acts directly on the thread guide member 6 'in order to shift this from the passive position drawn in solid lines to the separation position (shown in dashed lines) in order to lift the weft thread Y from the probe 7 of the tensiometer T.
- the rear thread guide member 6 in the thread running direction could be adjusted.
- both thread guide members 6 ' are arranged on a fork-like carrier 11, which can be shifted downwards by means of the actuator 10 from the working position of the tensiometer T drawn in solid lines to a separation position (not shown).
- the two thread guide members 6 ' e.g. closed thread eyelets, in this case form the ventilation element (s) of the separating device P.
- the probe 7 of the tensiometer T is, for example, a ring-shaped piezo element 12 with the converter 8.
- the converter 8 is, for example, held in a vertical guide 13 and can be scanned by means of the actuator 10 from the position shown in solid lines of the thread tension down to the passive position indicated by the broken line, so that the weft thread then does not touch the annular piezo element 12.
- an actuator 10 designed as a rotary drive is provided as the separating device P, by means of which a rod-shaped release element 9 can be adjusted in the direction of an arrow 14 from the passive position drawn in solid lines to a separating position (dashed line) by the distance between the stationary thread guide members 6 to separate the supported weft thread from the probe 7 of the tensiometer T.
- the probe 7 is, for example, rod-shaped and can be coupled to the converter 8 via strain gauges (not shown) or a triboelectric element or the like.
- the calibration could even be carried out during an entry process because the release process has no significant influence on the thread, possibly in a phase in which there is no braking.
- the tensiometer T could also be arranged upstream of the thread brake.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19858682A DE19858682A1 (en) | 1998-12-18 | 1998-12-18 | Loom weft feed system has a separation unit at the tensiometer to separate the weft yarn from the probe in the event of a zero yarn tension measurement signal for effective control of the yarn brake |
DE19858682 | 1998-12-18 | ||
PCT/EP1999/010086 WO2000037721A1 (en) | 1998-12-18 | 1999-12-17 | Yarn processing system and method for delivering weft yarns |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1141456A1 true EP1141456A1 (en) | 2001-10-10 |
EP1141456B1 EP1141456B1 (en) | 2003-04-02 |
Family
ID=7891709
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99964602A Expired - Lifetime EP1141456B1 (en) | 1998-12-18 | 1999-12-17 | Yarn processing system and method for delivering weft yarns |
Country Status (5)
Country | Link |
---|---|
US (1) | US6418977B1 (en) |
EP (1) | EP1141456B1 (en) |
CN (1) | CN1098943C (en) |
DE (2) | DE19858682A1 (en) |
WO (1) | WO2000037721A1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10153326A1 (en) | 2001-10-29 | 2003-05-08 | Iropa Ag | Thread processing system |
DE10210911A1 (en) | 2002-03-04 | 2003-09-18 | Picanol Nv | Device for detecting and / or adjusting a tensile force in a thread |
DE10348872A1 (en) * | 2003-10-21 | 2005-05-25 | Iro Ab | Method for adjusting the thread tension, and projectile or rapier loom |
FR2864555B1 (en) * | 2003-12-24 | 2006-01-27 | Staubli Lyon | METHOD FOR MONITORING THE SUPPLY VOLTAGE OF AT LEAST ONE FRAME WIRE, FRAME WIRE FEEDER, AND WEAVING WIRE EQUIPPED WITH SUCH A DEVICE |
CZ298600B6 (en) * | 2005-08-05 | 2007-11-21 | Technická univerzita v Liberci | Device for picking weft through weaving machine shed |
EP1961686B1 (en) * | 2007-02-20 | 2016-09-14 | Iro Ab | Yarn tension monitoring and setting system |
US8960596B2 (en) | 2007-08-20 | 2015-02-24 | Kevin Kremeyer | Energy-deposition systems, equipment and method for modifying and controlling shock waves and supersonic flow |
ITMI20120141A1 (en) * | 2012-02-03 | 2013-08-04 | Btsr Int Spa | SYSTEM AND METHOD FOR SIMPLIFIED MANAGEMENT OF THE FEEDING OF A PLURALITY OF THREADS AND / OR CONSTANT SPEEDS TO A TEXTILE MACHINE |
US10669653B2 (en) * | 2015-06-18 | 2020-06-02 | Kevin Kremeyer | Directed energy deposition to facilitate high speed applications |
EP4317558A1 (en) * | 2022-08-04 | 2024-02-07 | ITEMA S.p.A. | Device for the automatic removal of wrong weft threads for air-jet weaving machines, and related method |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH639152A5 (en) * | 1979-05-04 | 1983-10-31 | Loepfe Ag Geb | ELECTRONIC WIFE GUIDE ON A WEAVING MACHINE WITH GRIPPER GUARDS. |
IT1227077B (en) | 1988-09-08 | 1991-03-14 | Vamatex Spa | SYSTEM TO CONTROL THE WEFT VOLTAGE SUPPLIED TO A TEXTILE FRAME WITHOUT SHUTTLES. |
DE4131656A1 (en) * | 1991-09-23 | 1993-03-25 | Iro Ab | METHOD AND WEAVING MACHINE |
DE4131652A1 (en) * | 1991-09-23 | 1993-04-01 | Iro Ab | WEAVING MACHINE AND ENTRY BRAKE FOR WEAVING MACHINES |
DE4323748C1 (en) * | 1993-07-15 | 1994-07-14 | Dornier Gmbh Lindauer | Weft brake |
US5476122A (en) | 1993-03-05 | 1995-12-19 | Lindauer Dornier Gesellschaft Mbh | Weft thread brake responsive to yarn characteristics in a loom |
DE59507651D1 (en) * | 1995-07-24 | 2000-02-24 | Rueti Ag Maschf | Electromagnetic thread brake and weaving machine with a thread brake |
IT1283381B1 (en) * | 1996-07-31 | 1998-04-17 | Roj Electrotex Nuova Srl | PROCEDURE FOR CHECKING THE INSERTION OF THE WEFT THREAD IN A WEAVING LOOM. |
-
1998
- 1998-12-18 DE DE19858682A patent/DE19858682A1/en not_active Withdrawn
-
1999
- 1999-12-17 CN CN99815689A patent/CN1098943C/en not_active Expired - Lifetime
- 1999-12-17 WO PCT/EP1999/010086 patent/WO2000037721A1/en active IP Right Grant
- 1999-12-17 US US09/868,370 patent/US6418977B1/en not_active Expired - Fee Related
- 1999-12-17 DE DE59904885T patent/DE59904885D1/en not_active Expired - Lifetime
- 1999-12-17 EP EP99964602A patent/EP1141456B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0037721A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1141456B1 (en) | 2003-04-02 |
CN1098943C (en) | 2003-01-15 |
WO2000037721A1 (en) | 2000-06-29 |
DE19858682A1 (en) | 2000-06-21 |
DE59904885D1 (en) | 2003-05-08 |
US6418977B1 (en) | 2002-07-16 |
CN1333848A (en) | 2002-01-30 |
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