EP1590516B1 - Vorspanneinrichtung für weblitzen - Google Patents

Vorspanneinrichtung für weblitzen Download PDF

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Publication number
EP1590516B1
EP1590516B1 EP04737241A EP04737241A EP1590516B1 EP 1590516 B1 EP1590516 B1 EP 1590516B1 EP 04737241 A EP04737241 A EP 04737241A EP 04737241 A EP04737241 A EP 04737241A EP 1590516 B1 EP1590516 B1 EP 1590516B1
Authority
EP
European Patent Office
Prior art keywords
heald
piston
tensioning
tensioning device
strand
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
EP04737241A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1590516A1 (de
Inventor
Günther Büchle
Johannes Bruske
Gerhard Pohl
Stefan Danner
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.)
Groz Beckert KG
Original Assignee
Groz Beckert KG
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Filing date
Publication date
Application filed by Groz Beckert KG filed Critical Groz Beckert KG
Publication of EP1590516A1 publication Critical patent/EP1590516A1/de
Application granted granted Critical
Publication of EP1590516B1 publication Critical patent/EP1590516B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C3/00—Jacquards
    • D03C3/24—Features common to jacquards of different types
    • D03C3/44—Lingoes

Definitions

  • the invention relates to a strand tensioning device, in particular for weaving machines.
  • Jacquard weaving machines generally have a so-called armor, which includes lacing cords, with which warp threads are deflected if necessary, up or down from their Kettfadenebene out.
  • the warp threads run approximately horizontally through the thread eye of an approximately vertically arranged strand.
  • the strands are connected at their upper end eyelet with a chore thread.
  • jacquard weights are attached to the lower end eyelet.
  • the jacquard weights exert a constant downward pull on the strands. From above, the strand is held by the choir thread. By pulling or releasing the chord thread, the strand is raised or lowered, which is accomplished by a jacquard apparatus. In this way, the warp threads can be raised or lowered individually or in groups to form a tray for a weft insertion.
  • the aim is to achieve very high numbers of shots. But the jacquard weights are too slow. The jacquard weights have therefore been replaced in the past by steel springs, which exert a downward traction on the heald. This allows about 800 to 1,000 shots per minute to be achieved.
  • the steel spring In the case of shed formation, for example, the steel spring has to accelerate the strand downwards, for which high forces are required in the case of the shot numbers mentioned above.
  • the steel spring must accelerate the strand, the warp thread and the choir or Harnischfaden. The speed with which she can do this depends on her own mass.
  • the chore thread can reduce the strand faster than the spring can accelerate itself.
  • the tension of the warp is increased. The warp thread thus supports the spring during the transfer of the warp thread into the lower shed.
  • a shedding device for weaving machines which has a pneumatic tensioning device for the healds.
  • To the shedding device includes a mechanical actuator, which is connected via strand cords with the strands to move them vertically.
  • the other end of each strand is connected to a piston which sits in a bore of a corresponding cylinder block.
  • the top of this piston can be acted upon with compressed air, thus one vertical the strand to generate downward pulling force.
  • the litz cords work against this force.
  • the pneumatic tensioning device forms a kind of spring member.
  • the shed forming device comprises a plurality of pistons, which are each connected to a strand to be clamped and each having at least two opposing surfaces. These are exposed to fluid pressures of different sizes, so that a fluid pressure difference acts on the working member. Thus, opposing forces of different magnitude are applied to the piston, resulting in a force acting in the clamping direction of the strand.
  • the piston is slidably mounted in a cylinder tube, whereby the piston terminates in the cylinder tube with one of its end faces a working space. The working space is connected to a buffer volume.
  • the strand tensioning device has, instead of the steel spring used hitherto, a working member which is connected to the strand to be tensioned and, by the action of pressure of a fluid, generates a force which loads the strand in the tensioning direction.
  • a gaseous fluid such as air
  • the fluid acting on the working member eg air
  • the working member can by suitable choice of material and design are made small and lightweight.
  • the working member is a piston which is reciprocally supported in a cylindrical straight pipe in a direction which corresponds with the tensioning direction of the strand.
  • the force on the piston can be generated in principle by a fluid pressure difference between its two end faces. It can also be generated by a surface difference, i. by different sized face areas, where matching or different pressure is applied. Furthermore, it is both possible to generate the force difference occurring on the piston, which generates a resultant force for tensioning the strand, by means of overpressure and / or underpressure. Positive-actuated strand tensioning devices are considered to be advantageous because of the high achievable forces in a small space. In addition, the penetration of dust or fiber remains in the system because of the prevailing overpressure then less likely.
  • the piston separates in the tubular working cylinder from a working space, for example, with a pressurized fluid, such as air, applied becomes. It is advantageous to connect the working space with a larger buffer volume, which is connected via a channel with the working space, which has no significant flow resistance. As a result, the subsequent flow of pressurized fluid from the buffer volume is not hindered in the working space, so that the pressure in the working space is almost constant even if the working space as a result of a piston movement in which the piston the maximum expected or desired speed has increased.
  • the free flow cross section of the connecting channel should not be narrower than the free cross section of the cylinder tube.
  • the piston is mounted in the cylinder tube by an air cushion and sealed sufficiently. This is done by the piston forms an air bearing with the inner wall of the cylinder tube.
  • the air gap is preferably in the micron range.
  • air channels may be provided in the piston, which open on its lateral surface and are fed, for example, from the front side. The air loss occurring through the gap between the piston and the cylinder wall is negligible.
  • the piston is connected to a traction means, in turn, the strand is connected.
  • the traction means may be for example a plastic wire (polyamide monofilament, Perlon monofilament) or a round steel wire.
  • the piston and the cylinder tube can be made of plastic.
  • the traction means is guided by a wall closing the cylinder tube. In the respective opening, for example, a plastic bushing can be arranged, which guides the traction means and seals the working space thereby.
  • the traction means and the socket can also be designed so that they form an air bearing. Thus, a total of almost friction and wear-free arrangement is made, can be generated with the fast strand movements and the warp thread load is lowered.
  • the strand tensioning device according to the invention is suitable for increasing the number of shots of a loom.
  • Said strand tensioning device can also form the basis for a strand tensioning arrangement, in which many similar strand tensioning devices are arranged side by side and each individually biasing a traction means actuated by a strand.
  • the strand tensioning devices of the strand tensioning arrangement can be controlled individually or in groups.
  • the jointly controlled strand tensioning devices may have a common buffer volume. The buffer volume should preferably exceed at least ten times the stroke volume of all connected strand tensioning devices.
  • FIG. 1 a strand tensioning arrangement 1 is illustrated which serves to apply to a group of not further illustrated strands, downward tensile forces.
  • the strands are connected to the pulling means 2 running upwards from the strand tensioning arrangement 1.
  • the strand tensioning arrangement 1 is pneumatically actuated, that is, the tensile force acting on the connecting means 2 is pneumatically generated.
  • the strand tensioning arrangement 1 is preferably connected via a control device 3 to a compressed air source not further illustrated.
  • the control device 3 includes control valves 4 and a controller 5 for controlling the control valves 4.
  • the strand tensioning arrangement 1 has a strand tensioning device 7 for each connection means 2.
  • the strand tensioning devices 7 are formed substantially equal to each other. They each consist of at least one cylinder tube 8 and a piston 9 slidably mounted therein as a working member.
  • the mutually parallel cylinder tubes 8 are each held at its upper and at its lower end in a holding plate 11 and 12, which have corresponding holes in which the cylinder tubes 8 sit fluid-tight.
  • the upper holding plate 11 is overlapped by a closure plate 14, which defines with the holding plate 11 an outwardly closed flat space 15 in which open the upper open ends of the cylinder tubes 8 and the compressed air connection 6.
  • a breakthrough 16 of the holding plate 11 the space 15 is connected to a buffer volume 17 in connection, which is bounded by a wall assembly 18. This is closed at the bottom by the retaining plate 12 and closes tightly against the holding plate 11 at the top.
  • the end plate 14 has in each case aligned with each cylinder tube 8 holes in which guide bushes 19 sit. Through these extend the connecting means 2, which are formed for example by Perlon threads or other metal or plastic wires.
  • the connected to the piston 9 and at its upper ends eyelets 21 (FIGS. FIG. 2 ) having connecting means 2 extend with a small clearance through the elongated guide bushes, wherein the air gap formed thereby forms an air bearing.
  • the piston 9 forms with the respective cylinder tube 8 each an air bearing.
  • the cylinder tubes 8 are open both at their upper and at their lower end. They protrude through the lower holding plate 12 and are here preferably covered by a cover plate 22 which defines a space 23 with the holding plate 12. This is vented to the outside.
  • a connection 25 provided with a corresponding filter 24 can serve. The filter prevents the ingress of dust into the space 23 and the cylinder tubes 8 during reciprocation of the piston.
  • the strand tensioning arrangement 1 described so far operates as follows:
  • each strand has a Litzenauge through which a warp thread is guided.
  • the space 15 and the buffer space 17 are acted upon via the terminal 6 with compressed air.
  • This has, for example, a pressure of 6 bar up.
  • the pressure acts on the upper end faces of the piston 9 while the lower end faces are acted upon by the much lower ambient pressure. Accordingly, a downwardly directed force is produced on each connecting means 2.
  • the serving as a channel space 15 has due to its large cross section, which is preferably significantly greater than the sum of the cross sections of all cylinder tubes, a very low flow resistance, so that no piston movement of the piston 9 inhibiting throttle effect arises.
  • the strand tensioning arrangement 1 thus enables a particularly fast adjusting movement of the strands with relatively low rest forces. It is less susceptible to vibrations, such as occur in steel springs, when used for tensioning strands.
  • the strand tensioning arrangement 1 thus allows increased weft or toe numbers of the weaving machine.
  • FIG. 4 1 illustrates an embodiment of a strand tensioning device 7, which can be used as a module for constructing a Strand tensioning arrangement is suitable, which consists of a plurality of such strand tensioning devices 7.
  • the strand tensioning device 7 has a cylinder body 26 which is provided with a central bore 27. Around this buffer holes 28, 29 are arranged. Both on its upper side and on its underside, the cylinder body 26 is closed off by caps 31, 32 which each have a recess 33, 34 on the side facing the cylinder body 26, via which the buffer bores 28, 29 communicate with the cylinder bore 27.
  • the buffer volumes 28, 29 of adjacent strand tensioning devices 7 should be combined in pairs or groups and connect a plurality of central bores 27 to one another. Thereby, the distance between the central holes 7 can be minimized.
  • the piston 9 is connected to the connecting means 2, which is guided by the seated in the cap 31 guide bushing 19.
  • the piston 9 is provided with a tubular extension 35 whose diameter is greater than the diameter of the connecting means 2 and whose length exceeds the maximum stroke of the piston 9.
  • the extension 35 thus protrudes in each working position of the piston 9 through an opening provided in the cap 32 opening 36, wherein it forms an air bearing with its wall.
  • FIG. 5 A modified embodiment is in FIG. 5 illustrated.
  • This has a united at its lower end with a closure piece 37 cylinder tube 8, in which the piston 9 is slidably mounted.
  • the cylinder tube 8 is surrounded by a jacket tube 38, which is arranged concentrically to the cylinder tube 8 and forms with this an annular buffer space 39.
  • This is closed at its upper end by a cover 41 through which the connecting means 2 lead.
  • a guide bushing 19 is seated in the cover 41.
  • the compressed air connection 6 serves to act on the buffer space 39 and thus of the working space with compressed air.
  • Jacquard weaving machines require a so-called stranded spring, which generates a tensioning force acting on the strand.
  • an air cylinder is used in which a piston is mounted with low friction. A monofilament connects the piston with the strand and thus effectively forms a tensioned piston rod. Due to surface or pressure difference between the two end faces of the piston creates a clamping force, which allows 2 very fast positioning movements and thus a very fast shedding and a high number of revolutions of the loom due to the low weight of the piston and the connecting means.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP04737241A 2003-02-07 2004-01-16 Vorspanneinrichtung für weblitzen Expired - Lifetime EP1590516B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10305016 2003-02-07
DE2003105016 DE10305016B4 (de) 2003-02-07 2003-02-07 Vorspanneinrichtung für Weblitzen
PCT/EP2004/000276 WO2004072341A1 (de) 2003-02-07 2004-01-16 Vorspanneinrichtung für weblitzen

Publications (2)

Publication Number Publication Date
EP1590516A1 EP1590516A1 (de) 2005-11-02
EP1590516B1 true EP1590516B1 (de) 2009-07-15

Family

ID=32863791

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04737241A Expired - Lifetime EP1590516B1 (de) 2003-02-07 2004-01-16 Vorspanneinrichtung für weblitzen

Country Status (5)

Country Link
EP (1) EP1590516B1 (zh)
CN (1) CN1748051B (zh)
DE (2) DE10305016B4 (zh)
TW (1) TWI248484B (zh)
WO (1) WO2004072341A1 (zh)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101058912B (zh) * 2007-05-29 2011-09-14 浙江理工大学 气动提花装置
CN103614840A (zh) * 2013-11-26 2014-03-05 江苏宋和宋智能科技有限公司 一种气动提花装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3853150A (en) * 1972-10-03 1974-12-10 E Romano Fluid-operated device for raising warp yarns in looms
GB1482640A (en) * 1974-10-23 1977-08-10 Autosyst Ltd Warp selection devices
DE2631175B1 (de) * 1976-07-10 1977-12-29 Wolfgang Ebisch Rueckzugvorrichtung fuer die webelitzen einer jacquardwebmaschine
IT1105933B (it) * 1977-07-26 1985-11-11 Brochier Soieries J Apparecchiatura per il comando dei movimenti dei fili di ordito in un telaio di tessitura
JPH0571036A (ja) * 1991-09-10 1993-03-23 Nippon Filcon Co Ltd 一端を支持した綜絖を用いた開口装置及びこの装置を用いた織り継ぐ方法
US5390709A (en) * 1992-12-16 1995-02-21 Martonffy; Barnabas Fabric forming machine including pneumatic shedding apparatus and method
CN2169653Y (zh) * 1993-06-06 1994-06-22 郭明强 简易防盗检查井盖
CH690037A5 (de) * 1995-08-30 2000-03-31 Agm Ag Mueller Fachbildeeinrichtung für Webmaschinen.
FR2759385B1 (fr) * 1997-02-13 1999-04-16 Staubli Lyon Dispositif de tirage et mecanique d'armure de metier a tisser comprenant un tel dispositif

Also Published As

Publication number Publication date
DE10305016B4 (de) 2007-02-01
DE502004009748D1 (de) 2009-08-27
DE10305016A1 (de) 2004-09-16
CN1748051B (zh) 2010-09-29
WO2004072341A1 (de) 2004-08-26
EP1590516A1 (de) 2005-11-02
TW200424379A (en) 2004-11-16
TWI248484B (en) 2006-02-01
CN1748051A (zh) 2006-03-15

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