EP0508947A1 - Pinces d'alimentation pour une machine à tisser à pinces - Google Patents

Pinces d'alimentation pour une machine à tisser à pinces Download PDF

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Publication number
EP0508947A1
EP0508947A1 EP92810189A EP92810189A EP0508947A1 EP 0508947 A1 EP0508947 A1 EP 0508947A1 EP 92810189 A EP92810189 A EP 92810189A EP 92810189 A EP92810189 A EP 92810189A EP 0508947 A1 EP0508947 A1 EP 0508947A1
Authority
EP
European Patent Office
Prior art keywords
clamping
thread
tongue
gripper
additional
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.)
Ceased
Application number
EP92810189A
Other languages
German (de)
English (en)
Inventor
Franco Bianchi
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.)
Sulzer AG
Original Assignee
Sulzer AG
Gebrueder Sulzer 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 Sulzer AG, Gebrueder Sulzer AG filed Critical Sulzer AG
Publication of EP0508947A1 publication Critical patent/EP0508947A1/fr
Ceased 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
    • D03D47/12—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick
    • D03D47/20—Constructional features of the thread-engaging device on the inserters
    • D03D47/22—Constructional features of the thread-engaging device on the inserters adapted for working a loop of weft part-way inserted in the shed and then straightened-out

Definitions

  • the invention relates to a rapier gripper for rapier weaving machines with a stationary thread supply, with a part of a clamping gap for the weft thread forming clamping tongue and with a leaf spring partially resting on the clamping tongue.
  • the braking effect generated by deflection around edges on the weft thread end piece has various disadvantages, particularly with a high weft load. Due to the Different properties of weft threads, such as surface roughness or diameter, the braking effect generated by deflection on one or more edges varies very much, especially at high entry speeds.
  • the timing of the weft cutting must be in a phase that ensures that the weft is clamped securely.
  • the thread is cut after it has been clamped. Due to varying braking forces, this point in time is subject to a large spread, which is why it is difficult to determine the cutting point, especially at high speeds. If the cutting is too early, the thread slips out of the gap. If the cutting is too late, the thread breaks.
  • Each deflection of the thread in the gripper grips an extension of the piece of thread required in the gripper.
  • Another disadvantage of deflections of the thread in the rapier gripper results from the fact that the deflections cause a jerky thread requirement during the insertion of the weft thread into the rapier gripper.
  • Another disadvantage is that the deflections also lengthen the unusable weft end piece between the clamping gap and the thread scissors.
  • the time window or the angle of rotation range for a safe thread cut should be enlarged and made more precise.
  • the object is achieved in that the deflections of the weft thread in the hook housing caused by the thread clamping device are reduced as much as possible, and a so-called soft clamping zone formed by the Space between the clamping tongue and leaf spring, a guide acting on the thread and reproducible braking.
  • the thread course across the hook housing is determined by the successive arrangement of thread guide groove, clamping gap and soft clamping zone in such a way that the maximum thread deflection around edges in the hook housing is always in an angular range of at most 90 °.
  • the bringer gripper according to the invention presupposes that the braking effect generated between the leaf spring and the clamping tongue remains reproducible over the entire working period, which necessitates cleaning the space between the leaf spring and the clamping tongue before deposits, in particular before flight.
  • the rapier rapier for rapier weaving machines with a stationary thread supply, with part of a clamping gap for the weft thread and with an additional clamping element partially resting on the clamping tongue is designed so that the clamping tongue and the additional clamping element form a soft clamping zone for the weft thread.
  • the weft thread is movable in the soft clamping zone and is subject to braking and guidance.
  • the clamping tongue and, with a tab, the additional clamping element outside the compartment are lifted off by an opening cam and the soft clamping zone and the clamping gap are cleaned of impurities by a cleaning device.
  • the device allows the time window or the angle of rotation range to be increased for a reliable cutting of the weft thread.
  • the braking effect additionally generated between the two surfaces of the clamping tongue and the leaf spring is considerably more reproducible even with different types of yarn and can be set differently by parameters such as the width of the leaf spring or the pressing force of the leaf spring.
  • the weft thread is movable in the soft clamping zone and is subjected to braking and guidance.
  • the advantages of the invention can be seen in the fact that the thread can be cut as soon as it is safely in the soft clamping zone.
  • the time of the final wedging of the thread in the clamping gap thus becomes more variable and can also take place during the entry movement of the hook in the shed.
  • This makes it possible to enlarge the time window or the angle of rotation range for a safe thread cut and to define it more precisely.
  • the thread course through the hook housing as well as through the soft clamping zone prevent jerky thread demand when inserting the weft thread into the hook hook.
  • the unusable weft end piece is shortened.
  • the additional clamping element holds the end of the weft in the soft clamping zone in the horizontal direction. Thanks to this fact, the thread end protrudes from the side wall of the hook and the freely movable weft end piece becomes shorter, which is why it hardly comes into contact with the warp threads during the insertion.
  • the guidance of the thread is, according to FIGS. 2 and 4, designed by the successive arrangement of thread guide groove 14, clamping gap and soft clamping zone 7 transversely to the hook housing in such a way that thread deflections around edges are reduced as much as possible within the hook housing and always in an angular range of at most 90 °. If necessary, rounding off the edge of the clamping edge 41 facing the soft clamping zone 7 is also beneficial.
  • Both measures result in a reduction of the braking effect on the weft thread from edges located within the hook housing 6.
  • a further, More reproducible braking effect on the weft thread 6 is generated within the soft clamping zone 7 by friction of the weft thread 6 between the clamping tongue 4 and the additional clamping element 5.
  • the thread 6 is movable in the entire soft clamping zone 7 with a similar resistance in all directions, in particular also longitudinally and transversely to the additional clamp 5.
  • the edge of the clamping zone 41 facing the soft clamping zone brings about a braking force on the weft thread 6, which mainly acts transversely to the additional clamp.
  • the braking forces acting together on the weft thread 6 through the clamping edge 41 and the soft clamping zone 7 are preferably determined such that the weft thread 6 experiences a smaller braking force along the clamping tongue 4 and a greater braking force transversely to the clamping tongue 4.
  • the thread can be cut by the thread scissors 11 as soon as it is sufficiently deep in the soft clamping zone 7.
  • the soft clamping zone 7 makes it possible to enlarge the time window or the angle of rotation range for a safe thread cut. If the cutting is too early, the thread slips out of the gap. If the cutting is too late, the thread breaks. As shown in FIG. 5, the thread 6 can be cut by the thread scissors 11 as soon as it is sufficiently deep in the soft clamping zone 7.
  • the cut end of the weft thread 6 experiences a braking force in the soft clamping zone, but is still movable and is guided through the soft clamping zone 7 and the clamping edge 41 during the insertion movement of the carrier gripper 1 in such a way that, due to the force acting on the thread 6 to be inserted , slips even further back until the weft end 6 is securely stuck between the clamping edge 41 and the clamping edge 21 of the hook housing 2 in the tapering clamping gap.
  • the thread cutting takes place rather late in the permissible time window or angle of rotation range, this means that the hand gripper 1 closes already introduced a larger part into the shed 12 and acts on the thread 6 on both sides, also from the thread scissors 11, a force opposite to the direction of entry. The thread thus penetrates deep into the soft clamping zone 7 before it is cut by the thread scissors 11.
  • the weft thread 6 remains in the clamping gap until it is pulled out of the rapier gripper 1 by the slave gripper in the shed 12.
  • FIG. 3 A comparison of the bringer gripper according to the invention (FIG. 1) with a known bringer gripper (FIG. 3) shows that in the known bringer gripper the thread 6 in the inlet slot 3 is deflected and braked by the edge of the leaf spring 5 and the clamping edge 41 of the clamping tongue 4.
  • the thread 6 could also penetrate into this space and be braked additionally. However, this was an undesirable, uncontrollable effect.
  • the thread 6 had to be cut very precisely in time by the thread scissors 11.
  • the clamping tongue 4 is provided with a tab 42 and the leaf spring 5 with a tab 52.
  • the extending rapier gripper 1 is cleaned by successively opening the leaf spring 5 through the tab 52 and later also the clamping tongue 4 through the tab 42 with an opening cam 13 is raised and in particular the soft clamping zone 7 and the clamping gap are cleaned with a suction, blowing or stripping device, not shown.
  • the additional clamping element 5 is fixed at the end facing away from the inlet slot 3 on the housing 8, 9 of the gripper 1 with a screw connection 10.
  • the bringer gripper according to the invention is suitable e.g. particularly good for open, non-twisted filament yarns or thin and smooth filament yarns.
  • different geometrical shapes of the soft clamping zone 7 and the additional clamp 5 connected therewith can prove to be advantageous.
  • a design of the additional terminal 5 according to the invention also exists if the additional terminal 5 does not form a clamping zone 7 of the same width as shown in FIG. 1, but forms other shapes, e.g. progressively increasing or decreasing starting from the inlet slot 3.
  • the invention relates in particular to a belt gripper weaving machine in which the entry belts of the grippers are moved back and forth by means of oscillating belt wheels.
  • the bringer gripper according to the invention is intended for weaving machines in which the weft thread is presented horizontally.
  • the invention can also be used for weaving machines with bar rapier or other rapier entry systems, even without passing the weft through the center.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP92810189A 1991-04-10 1992-03-17 Pinces d'alimentation pour une machine à tisser à pinces Ceased EP0508947A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH106491 1991-04-10
CH1064/91 1991-04-10

Publications (1)

Publication Number Publication Date
EP0508947A1 true EP0508947A1 (fr) 1992-10-14

Family

ID=4201610

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92810189A Ceased EP0508947A1 (fr) 1991-04-10 1992-03-17 Pinces d'alimentation pour une machine à tisser à pinces

Country Status (2)

Country Link
EP (1) EP0508947A1 (fr)
DE (1) DE9202068U1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111003545A (zh) * 2019-12-27 2020-04-14 上海骄成机电设备有限公司 一种铝箔膜定位送料装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10018939A1 (de) 2000-04-17 2001-10-18 Picanol Nv Greifergehäuse für einen Greifer einer Webmaschine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1388474A (fr) * 1964-04-10 1965-02-05 Fonderie Officine Di Gorizia S Aiguille d'insertion de la trame pour métiers sans navette
FR2132561A1 (en) * 1971-04-05 1972-11-24 Diederichs Sa Ateliers Shuttleless loom - has picking needle which can be easily cleaned to remove waste fibres
CH579653A5 (en) * 1975-02-28 1976-09-15 Rueti Ag Maschf Weft inserter head for looms with belts or rods - has thread clamp and guide eyelet which do not clog
DE3003105A1 (de) * 1979-01-30 1980-08-07 Rueti Ag Maschf Bringergreifer fuer webmaschinen mit entnahme des schussfadens von ortsfesten spulen
EP0272206A2 (fr) * 1986-11-19 1988-06-22 GebràœDer Sulzer Aktiengesellschaft Organe d'insertion du fil de trame pour métier à tisser à griffes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1388474A (fr) * 1964-04-10 1965-02-05 Fonderie Officine Di Gorizia S Aiguille d'insertion de la trame pour métiers sans navette
FR2132561A1 (en) * 1971-04-05 1972-11-24 Diederichs Sa Ateliers Shuttleless loom - has picking needle which can be easily cleaned to remove waste fibres
CH579653A5 (en) * 1975-02-28 1976-09-15 Rueti Ag Maschf Weft inserter head for looms with belts or rods - has thread clamp and guide eyelet which do not clog
DE3003105A1 (de) * 1979-01-30 1980-08-07 Rueti Ag Maschf Bringergreifer fuer webmaschinen mit entnahme des schussfadens von ortsfesten spulen
EP0272206A2 (fr) * 1986-11-19 1988-06-22 GebràœDer Sulzer Aktiengesellschaft Organe d'insertion du fil de trame pour métier à tisser à griffes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111003545A (zh) * 2019-12-27 2020-04-14 上海骄成机电设备有限公司 一种铝箔膜定位送料装置
CN111003545B (zh) * 2019-12-27 2023-01-17 上海骄成超声波技术股份有限公司 一种铝箔膜定位送料装置

Also Published As

Publication number Publication date
DE9202068U1 (fr) 1992-04-02

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