EP1401751A2 - Grappin pour fil - Google Patents

Grappin pour fil

Info

Publication number
EP1401751A2
EP1401751A2 EP02701276A EP02701276A EP1401751A2 EP 1401751 A2 EP1401751 A2 EP 1401751A2 EP 02701276 A EP02701276 A EP 02701276A EP 02701276 A EP02701276 A EP 02701276A EP 1401751 A2 EP1401751 A2 EP 1401751A2
Authority
EP
European Patent Office
Prior art keywords
thread
gripping element
gripping
gripper according
thread gripper
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
Application number
EP02701276A
Other languages
German (de)
English (en)
Other versions
EP1401751B1 (fr
Inventor
Björn Halvarsson
Patrik Magnusson
Anders SVANSTRÖM
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.)
Iropa AG
Original Assignee
Iropa 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 Iropa AG filed Critical Iropa AG
Publication of EP1401751A2 publication Critical patent/EP1401751A2/fr
Application granted granted Critical
Publication of EP1401751B1 publication Critical patent/EP1401751B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/08—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to delivery of a measured length of material, completion of winding of a package, or filling of a receptacle
    • B65H63/088—Clamping device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the invention relates to a thread gripper of the type specified in the preamble of claim 1.
  • Such thread grippers are used, for example, in the thread path between a so-called loop storage device and a textile machine, for example a weaving machine, or on a water-jet weaving machine (JP-U-60-78 885 [58-169670]), to the under Determine the tensile effect of the thread between the shots and release them for entry at a time dependent on the web cycle.
  • a so-called loop storage device for example a weaving machine
  • a water-jet weaving machine JP-U-60-78 885 [58-169670]
  • magnetically opening thread grippers are known, in which the magnet releases the second gripping element from the first gripping element in order to release the thread held so far for movement.
  • the switching magnet is coupled to the second gripping element in such a way that the second gripping element and the armature of the switching magnet begin the opening movement together.
  • the thread begins its movement as soon as the contact pressure of the thread clamping surfaces is reduced to such an extent that the tension prevailing in the thread is able to overcome the frictional force of the thread on the thread clamping surfaces. In the thread release position, the thread runs through practically without contact with the thread clamping surfaces.
  • the invention has for its object to provide a thread gripper of the type mentioned, which is characterized by a precisely predeterminable thread release time.
  • the second gripping element taken along. It moves very quickly from standstill to the release position, e.g. in a few milliseconds, so that there is no longer a smooth transition, but a sharp and precisely defined, precisely reproducible release time for the thread.
  • the precisely observable release time ultimately results from the fact that the start of the gripping element is more predictable than before, and the gripping element makes the contact pressure considerably faster from standstill, i.e. within a much shorter period of time than was previously possible, and external influences no longer have any noticeable effect with this rapid movement of the gripping element.
  • the adjusting element is first accelerated to a substantially constant speed alone before it hits the second gripping element and takes it along with the then already high and relatively constant speed.
  • the release time does not slide because the second gripping element executes its opening stroke at high speed, ie a relatively steep acceleration gradient, and because the acceleration phase of the actuating element can also be disregarded for the movement of the gripping element.
  • a magnetic drive of the control element a compact, lighter and inexpensive switching magnet, possibly with low power, can be used, because in the acceleration phase only the control element is to be driven and the second gripping element can only be driven when the control element has already accelerated sufficiently and considerably Brings acceleration energy.
  • the game resulted in a delay time to accommodate the movement Greifele ⁇ ment, which can correspond to almost half of the total opening cycle from absorption of movement of the actuating element.
  • a yarn gripper example takes the opening ⁇ cycle about 6.3 ms, and the delay is about 3 ms. This illustrates how quickly the gripping element is forced to perform its opening stroke and also how quickly the release time is reached from the start of movement of the gripping element.
  • the actuator armature or the armature of a switching magnet is ⁇ .
  • Such a switching magnet is characterized in that it has a relatively accurately predeterminable opening force curve at best narrowing-down stage in the Accelerati ⁇ varied by external influences, while the part of the opening curve, in which it is a relatively constant velocity or constant acceleration ⁇ ranges, for example, can be predicted precisely with its gradient.
  • the contact pressure is set so strongly by the second gripping member beauf ⁇ striking spring and being that the train is under thread is clamped reliably motionless in the gripping position. It is expedient to use a relatively long-stroke spring that has a precisely predictable and relatively harmonic spring characteristic.
  • a second switching magnet and / or a return spring or a permanent magnet can be provided.
  • a second switching magnet has the advantage that it can be switched off when the first switching magnet is energized or shortly before and no longer generates interference.
  • a permanent magnet that adjusts the armature in the gripping position so that the predetermined play is given for the next opening stroke can also be used profitably for the benefit of a snap movement when accelerating the actuating element.
  • This snap action allows a precisely predeterminable acceleration phase of the valve to be achieved, in which even varying external influences no longer have any noteworthy effect.
  • the principle according to the invention is preferably applied to a thread gripper of the plate principle, the thread clamping surfaces of which interact in a circular manner, the thread passing between the thread clamping surfaces and passing at least approximately through the central axis.
  • Annular thread clamping surfaces lead to a large clamping area for the thread.
  • the circular ring surfaces can be flat or structured or curved. However, this does not exclude other forms of thread clamping surfaces and / or differently shaped gripping elements, e.g. Use slats or the like.
  • a low-friction, clean telescopic guide of the second gripping element is achieved with a pot shape and a guide tube.
  • the stem of the fitting which penetrates the bottom of the pot in the middle, with the driver arranged on it, ensures central power transmission without side forces.
  • the play can be provided between the driver fixedly arranged on the shaft and the pot base, or alternatively between the driver and a stop on the shaft. In any case, it is ensured that the valve first moves through the play to a relatively constant speed and / or acceleration before it mechanically interacts with the second gripping element and takes it along in the opening direction.
  • the tube can also take over the task of guiding the spring, which is responsible for the gripping position. If the spring engages the back of the thread clamping surface of the second gripping element, the contact pressure responsible for the gripping position is transmitted directly where it is passed on to the thread.
  • the first gripping element In order to be able to adjust the gripping position and the contact pressure for different thread qualities and / or thread strengths or different tensile forces in the thread, it is expedient to arrange the first gripping element in an adjustable manner and / or to make the prestressing of the spring adjustable.
  • the thread gripper is preferably used in an entry system for triggering the loom-cycle-dependent entry start, in which a special thread storage device is provided which presents the entry system with several thread turns in a tubular wound configuration without any internal support, for example according to DE 100 51 635. Since the thread turns Since entry is essentially balloon-free and can be entered very quickly from the start of the entry due to a lack of internal support, a precisely predeterminable release time in the thread gripper that is coordinated with the weaving machine cycle is advantageous in order to ensure optimal entry conditions and short entry times.
  • 1 is an opening diagram of a conventional thread gripper
  • Fig. 2 shows the opening diagram of a thread gripper according to the invention
  • Fig. 3 shows a longitudinal section of a thread gripper according to the invention in its
  • Gripping position. 1 shows an opening diagram of a conventional thread gripper, in which the second gripping element G2 begins the opening movement together with its adjusting element.
  • the stroke S is plotted on the vertical axis and the time t is plotted on the horizontal axis.
  • the upper horizontal line G1 / G2 represents the positions of the stationary first gripping element G1 and the second gripping element G2 in the gripping position.
  • the lower horizontal line F / G2 represents the position of the second gripping element during the opening stroke at the thread release time.
  • the opening curve A shown in full lines overlaps with the lower horizontal line at a very small angle.
  • Variable friction conditions, temperature conditions, wear and tear, spring fatigue and the like can change the acceleration phase, so that the gradient of the opening curve initially increases more (lower dashed part A2) or weaker (upper dashed part A1) than in the opening curve drawn in a solid line , This leads to a drift of the actual release time (vertical lines to the intersection of curve A, A1, A2 with the lower horizontal line), whereby due to the still weak gradient, slight deviations in the acceleration phase strongly affect the drift of the release time (between t1 to t3) impact.
  • FIG. 2 is the opening diagram for a thread gripper G according to the invention in FIG. 3.
  • the upper horizontal line G1 / G2 represents the positions of the first and second gripping elements in the gripping position.
  • the lower horizontal line F / G2 represents the position of the second gripping element G2 at the time of release F, ie as soon as the contact pressure is reduced to such an extent that the prevailing tension in the thread sets it in motion.
  • A is the opening curve of the actuator.
  • B is the opening curve of the second gripping element G2, which coincides with curve A from time X. Thanks to a play H between the adjusting element and the second gripping element G2, the adjusting element initially executes its acceleration phase without moving the second gripping element, for example until the adjusting element has reached a substantially constant speed.
  • Unavoidable external influences (upper and lower smiled customer parts A1, A2) no longer have any influence if the control element takes the second gripping element G2 with them after passing through play H (customer B).
  • the result is the release time F exactly defined at tO when the common opening curve A, B intersects the lower horizontal line F / G2 very steeply.
  • the entire opening movement of the second gripping element G2 takes place at a higher speed and along a very steep curve part, which results in the precisely defined release time F.
  • Varying external influences (frictional forces, spring fatigue, temperature influences and the like) no longer affect the release time when the second gripping element moves quickly.
  • the gripping position is shown in which a thread Y, which is under a tensile effect Z in the direction of an arrow, is fixed motionless.
  • Thread guiding elements 2, 3 defining the thread path are arranged in a housing 1.
  • a stationary gripping element G1 is fixed to a support projection 5. If necessary, the position of the first gripping element G1 can be adjusted by means of a threaded bore 4.
  • an annular, in this embodiment flat, thread clamping surface K1 is provided on the underside of the first gripping element G1.
  • the second gripping element G2 works together with the first gripping element G1. This is designed in the manner of a plate with a likewise circular thread clamping surface K2.
  • the plate is formed by a flange 6 on the free opening edge of a pot 7, which is slidably guided in a tube 9.
  • a sliding guide 10 can be connected in between.
  • the pot base designated 8 is perforated and forms a stop 15 with its upper side.
  • the stop 15 is formed by a damping element 16 on the pot base 8.
  • a spring 11 is guided, which is supported in a stationary manner and acts on the rear side of the flange 6 with its upper end. If necessary, the preload of the spring 11 can be adjusted.
  • a switching magnet M On the underside of the housing 1, a switching magnet M is arranged, which contains a coil 111 and an internal armature 12, which is pulled down when the coil 11 is excited from the raised position shown.
  • a shaft 13 is connected to the armature 12 and passes through the bottom 8 of the pot and inside the pot 7 carries a driver 14.
  • the thread clamping surfaces K1, K2 are pressed against one another by the spring 11 such that the thread Y is prevented from running.
  • the valve 12 is in the position shown, in which a play H is set between the driver 14 and the stop 15.
  • the play H can be approx. 2.0 mm.
  • the extent of the play H seen in the opening direction corresponds, for example, to the actuating stroke of the driver 14 from standstill to an essentially constant speed and / or acceleration. That is, the driver 14 executes the acceleration phase of the valve 12 with gradually increasing speed within the play H, before the driver 14 hits the stop 15 and takes the second gripping element G2 downward in FIG. 3 in the direction towards the full open position of the thread gripper.
  • the contact pressure between the thread clamping surfaces K1, K2 is reduced very quickly until the tensile force in the thread Y is sufficient to move it at the thread release time. Then the second gripping element G2 is further adjusted to the full open position of the thread gripper.
  • the shaft 13 can be guided in a sliding guide 20, e.g. a graphite bushing, run for good centering.
  • a centering slide guide 21 could be provided for the valve 12.
  • the armature 12 could be guided with an extension in the lower, stationary iron core of the switching magnet M.
  • the spring 11 presses the thread clamping surfaces K1, K2 against each other again in order to fix the thread Y.
  • the valve 12 is carried upwards.
  • a second switching magnet 17 is provided, which carries out the adjustment of the valve 12 into the position shown in FIG. 3, and / or an indicated return spring 19.
  • the return spring 19 could also be provided between the stop 15 and the driver 14. It would also be conceivable to provide a magnet in the cavity in the first gripping element G1, which pulls the driver 14 into the position shown in FIG. 3, or even better, at least one small permanent magnet 18 in the housing 1 adjacent to the armature 12.
  • the permanent magnet 18 can be used profitably to accelerate the valve in a snap movement before it hits the second gripping element G2.
  • the actuating force of the switching magnet M builds up gradually.
  • the holding force of the permanent magnet 18 for the armature 12 strongly depends on the gap width and drops sharply as the gap width increases.
  • the switching magnet first builds up an actuating force which must first overcome the holding force of the permanent magnet before the armature 12 begins its movement. Thanks to the actuating force of the switching magnet M, which is already high at this point, and the holding force of the permanent magnet 18, which suddenly abates, the desired snap movement results with an exactly predeterminable acceleration phase for the armature 12.
  • the armature 12 meets the second in an already relatively steep opening curve area Gripping element that is quickly moved from a standstill over the position in which the thread Y is released. In this way, external, varying influences have no significant effect on the acceleration phase of the valve 12 or the opening phase of the second gripping element G2.
  • the game H could be provided between the driver 14 and a stop 15 provided on the shaft 13 at the top.
  • the driver 14 is permanently on the pot bottom 8, while the stop provided on the shaft 13 is displaced upwards by the play H.
  • the coil 111 When the coil 111 is energized, the armature 12 is pulled down and first accelerated to a relatively constant speed before the stop on the shaft 13 meets the driver 14 and the latter takes the second gripping element G2 with it.
  • a return spring could be inserted between the driver 14 and the stop on the shaft 13.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Knitting Machines (AREA)

Abstract

L'invention concerne un grappin pour fil (G) comprenant un premier élément de préhension (G1) fixe portant une surface de serrage de fil (K1) et un second élément de préhension (G2) portant une surface de serrage de fil (K2), dont les surfaces de serrage de fil (K1, K2) peuvent être comprimées l'une contre l'autre avec une pression de contact ajustable dans une position de préhension maintenant les fils (Y) entre elles, ainsi qu'un élément de réglage (S) pouvant être entraîné hors d'une position de repos, au moins dans un mouvement d'ouverture, qui peut être mis en prise sur le second élément de préhension et déplace les surfaces de serrage de fil en passant par une position de libération de fil, à un moment de libération du fil, jusqu'à ce que le grappin de fil (G) se trouve en position ouverte. En position de préhension du grappin de fil, il est prévu entre l'élément de réglage (S) et le second élément de préhension (G2), une course à vide correspondant dans le sens du mouvement d'ouverture sensiblement à la course de l'élément de réglage pendant sa phase d'accélération entre l'état au repos et une vitesse au moins sensiblement constante et/ou une accélération constante.
EP02701276A 2001-02-16 2002-02-13 Grappin pour fil Expired - Lifetime EP1401751B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2001107311 DE10107311A1 (de) 2001-02-16 2001-02-16 Fadengreifer
DE10107311 2001-02-16
PCT/EP2002/001513 WO2002066354A2 (fr) 2001-02-16 2002-02-13 Grappin pour fil

Publications (2)

Publication Number Publication Date
EP1401751A2 true EP1401751A2 (fr) 2004-03-31
EP1401751B1 EP1401751B1 (fr) 2006-05-03

Family

ID=7674310

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02701276A Expired - Lifetime EP1401751B1 (fr) 2001-02-16 2002-02-13 Grappin pour fil

Country Status (5)

Country Link
EP (1) EP1401751B1 (fr)
CN (1) CN1302167C (fr)
AU (1) AU2002234633A1 (fr)
DE (2) DE10107311A1 (fr)
WO (1) WO2002066354A2 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004036996B3 (de) 2004-07-30 2005-12-01 Lindauer Dornier Gmbh Duesenwebmaschine, insbesondere Luftdüsenwebmaschine, mit einer Klemmeinrichtung im Mischrohr
DE102006025968B3 (de) * 2006-06-02 2007-11-29 Lindauer Dornier Gmbh Verfahren zum Klemmen eines Schussfadens in einer Düsenwebmaschine, insbesondere Luftdüsenwebmaschine, Klemmeinrichtung und Düsenwebmaschine
JP2008247560A (ja) * 2007-03-30 2008-10-16 Murata Mach Ltd 張力付与装置
WO2008154967A1 (fr) * 2007-06-21 2008-12-24 SSM Schärer Schweiter Mettler AG Porte-fil
EP2388361A1 (fr) * 2010-05-18 2011-11-23 Textilma AG Poignée et dispositif d'entrée de fils de trame pour un métier à tisser à pince
CN103668757B (zh) * 2013-12-18 2015-12-02 海宁市万路针织有限公司 一种五指袜袜机上的导纱架
CN103774340B (zh) * 2014-01-29 2016-06-01 汕头市连兴实业有限公司 全电脑横织机自动夹线装置及其系统
JP6436574B2 (ja) * 2015-06-23 2018-12-12 日特エンジニアリング株式会社 把持装置及び把持方法
JP6460923B2 (ja) * 2015-06-23 2019-01-30 日特エンジニアリング株式会社 線材把持装置及び線材把持方法
CN105137912B (zh) * 2015-07-20 2018-02-13 广东溢达纺织有限公司 成衣生产中裁床自动拉布机的标准工时确定方法及系统
ITUB20155266A1 (it) * 2015-10-30 2016-01-30 Roj S R L Freno elettromagnetico pilotato per il controllo della tensione dei fili di trama in macchine tessili

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR891832A (fr) * 1942-11-30 1944-03-21 Perfectionnements au montage et au fonctionnement des organes de régulation des fils de trame pour métiers à tisser sans navette à trames multiples
US3181569A (en) * 1964-02-06 1965-05-04 Beacon Mfg Co Filling yarn control means
JPS5381758A (en) * 1976-12-27 1978-07-19 Nissan Motor Device for gripping weft on shuttleless loom
US4351370A (en) * 1980-05-05 1982-09-28 Crompton & Knowles Corporation Yarn brake for a textile machine
BE1001207A3 (nl) * 1987-11-12 1989-08-16 Picanol Nv Draadklem.
SE504096C2 (sv) * 1995-03-02 1996-11-11 F & N Mekanik Ab Garngripare för garnmatningssystem i vävstolar
DE59507651D1 (de) * 1995-07-24 2000-02-24 Rueti Ag Maschf Elektromagnetische Fadenbremse und Webmaschine mit einer Fadenbremse

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02066354A3 *

Also Published As

Publication number Publication date
DE10107311A1 (de) 2002-08-29
EP1401751B1 (fr) 2006-05-03
CN1535336A (zh) 2004-10-06
DE50206669D1 (de) 2006-06-08
WO2002066354A3 (fr) 2003-12-11
CN1302167C (zh) 2007-02-28
AU2002234633A1 (en) 2002-09-04
WO2002066354A2 (fr) 2002-08-29

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