EP0863237A1 - Dispositif de sélection pour fils de trame - Google Patents

Dispositif de sélection pour fils de trame Download PDF

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Publication number
EP0863237A1
EP0863237A1 EP97830090A EP97830090A EP0863237A1 EP 0863237 A1 EP0863237 A1 EP 0863237A1 EP 97830090 A EP97830090 A EP 97830090A EP 97830090 A EP97830090 A EP 97830090A EP 0863237 A1 EP0863237 A1 EP 0863237A1
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EP
European Patent Office
Prior art keywords
sorting
yarn
heddle
weft
weft yarns
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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.)
Withdrawn
Application number
EP97830090A
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German (de)
English (en)
Inventor
Ivo Moia
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to EP97830090A priority Critical patent/EP0863237A1/fr
Publication of EP0863237A1 publication Critical patent/EP0863237A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • D03D47/38—Weft pattern mechanisms

Definitions

  • the present invention relates to a sorting device for weft yarns.
  • the present invention relates to a sorting device for weft yarns having a very simple and compact structure and suitable to be easily applied to looms to feed, cut and thread a weft yarn into the bearing grippers of looms in a easy, smooth and precise manner.
  • looms are provided with devices for sorting weft yarns which have the task of separating weft yams of various type from one another, selecting the one which is each time more suitable for the type of working and fabric, and to feed the chosen yarn to the bearing gripper of the loom.
  • sorting devices which are called in the art “weft feeding machines”, comprise a mechanism, driven by an electromagnet and activated in some cases by cables running within special sheaths, which shifts the yearn constituting the weft to such a position as to be firstly collected by the bearing gripper of the loom and thereafter cut by scissors before entering the fabric. Afterwards, the gripper runs across the length of the loom keeping in its inside an end of the yarn and locates the latter between the warp yarns opened by meshes. On the following run, the sorting device feeds again a yarn to the gripper, to be collected by the latter and transported throughout the whole length of the loom.
  • the known sorting devices have several drawbacks which limit their use and application in looms.
  • a first drawback is due to the fact that, as the various heddles that constitute the device are placed side by side, each heddle shifts the yarn it carried to a different direction.
  • the gripper which collects the weft yarn chosen will find therefore the yarn in a different position according to the heddle activated; this causes the synchronisation of the whole mechanism relatively to the movement of grippers to be difficult.
  • the yarn cut by scissors involves a high waste of yarn which affects the cost of the fabric especially when expensive yarns are used, such as, for instance silk yarns.
  • Object of this invention is to obviate all these drawbacks of the devices for sorting weft yarns of the known art.
  • object of this invention is to provide a sorting device for weft yarns having a very simple and not encumbering structure, of easy maintenance and assembly on textile looms and such as to allow to reduce yarn waste during the cutting, and to feed and insert in a quick and precise manner the yarn into the bearing gripper of the loom.
  • a sorting device comprising: a package of heddles, each heddle carrying a weft yarn; a means for sorting and extracting each heddle; a means for locking and cutting the sorted yarn and its feeding to a bearing gripper of the loom; a means for transferring the yarn sorted by the sorting means to the locking and cutting means, wherein said means for sorting and extracting each heddle comprises and electromagnet which selects and unlocks a heddle, and a lever activated by a parallel axis oscillator provided with gearing means with conjugated cams and roller feeler, which extracts the chosen heddle from the package, and wherein said positioning means and said locking and cutting means are activated by parallel axis oscillators provided with gearing means with conjugated cams and roller feeler; all the conjugated cams being placed on a rotary axis driven by the loom motor.
  • Parallel axis oscillators are known mechanisms which transform the uniform rotary motion of the rotary axis into an intermittent oscillating motion. Tests carried out by the Applicant have stressed that such oscillators are particularly suitable to be used in a sorting device for weft yarn, as they allow to obtain high precision, high speed, low vibration, noiselessness, absolute repetitivity of movements and application versatility.
  • the profile or shape of conjugated cams is determined based on the movements and oscillations which the operation to be carried out requires and on the synchronism of the various operations.
  • the sorting device for weft yarns of the present invention comprises a package (2) of heddles (3), placed parallelly to one another; a means (11) for sorting and extracting each heddle; a means fo locking and cutting (44) the sorted yarn (4) and its positioning near a bearing gripper (5) of a loom, and a means (32) for feeding the sorted yarn from the sorting and extraction means (11) to the locking and cutting means (44).
  • Said sorting and extracting (11), feeding (32) and locking and cutting (44) means are activated at the same time and in a synchronous manner by corresponding parallel axis oscillators (25, 25', 25'', 25'''), whose conjugated cams (6, 6', 6'', 6''') are mounted on a single rotary shaft (7) driven by a loom motor by means of conventional gearing means.
  • the rotary shaft (7) is supported by a bearing structure (1) in which the heddle package (2) is inserted.
  • the heddle package (2) may be constituted of any number of heddles (3); in the figures, heddles are 8, but they may vary between 2 and 20.
  • Each heddle (3) comprises a body (8) having a rectangular section, to allow the side by side sliding, preferably made from wear-resistant, high slide plastic material, and a ferrule (9), possible from metal, provided with a through hole (10) at its free end and adjustably fixed to body (8) by means of conventional fastening means, such as, for instance, screws.
  • a weft yarn (4) is inserted in the through-hole (10).
  • the fastening of ferrule (9) to body (8) may be varied and adjusted to allow the transferring means (32) to hook without mistake possibility the sorted yarn (4) which passes into the through-hole (10).
  • the means for sorting and extracting (11) a heddle (3) comprises an electromagnet (12) activated by a conventional electronic work control system (not represented in the figure).
  • Said electromagnet (12) is provided with a spindle or piston (13) which meets an end of a first lever (14) connected to a second lever (16), parallel to the first one, by a tie rod (15).
  • An end (16'') of said second lever (16) meets end (8') of body (8) of a heddle (3) opposite to the one provided with the ferrule (9).
  • said second lever (16) is hammer-shaped, with the protruding part smoothed on each side to avoid any touch with the adjoining heddles during the movement.
  • the first and second lever (14, 16) are pivoted at the opposite free end (14', 16') to a fixed structure.
  • Body (8) of each heddle (3) is provided with a first cavity (17) wherein a stop (18) is inserted fixed to a bearing structure
  • a spring (19) provides to keeping body (8) of each heddle (3) in touch with end (16'') of the second lever (16) and stop (18) inserted in the first cavity (17).
  • the sorting and extraction means (11) comprises also a lever (20) having an end (20) inserted in a hollow (24) of a sliding carriage (22) and the opposite end (20'') pivoted at (21) to the bearing structure (1) and fixed to a roller feeler (26) of a parallel axis oscillator (25).
  • the rollers of said feeler (26) slide along the external surfaces of the first conjugated cam (6).
  • Carriage (22) slides along a guide (23) fastened to a fixed structure. Said carriage (22) is also provided on the surface looking towards body (8) of the heddle with a protrusion (27) opposed by a spring (28) located between said protrusion (27) and carriage (22). In correspondence of said protrusion (27), body (8) of each heddle (3) is provided with a second cavity (29).
  • body (8) has a groove (30) wherein a pin (31) is inserted, fastened to a fixed structure.
  • Body (8) of each heddle may slide and rotate about said pin (31).
  • the corresponding second lever (16) acts on end (8') of the selected heddle, causing the same to rotate around pin (31).
  • Such rotation causes the release of stop (18) from the first cavity (17) and the insertion of protrusion (27) of carriage (22) into the second cavity (29) of the heddle.
  • the selected heddle is connected to the sliding carriage (22) and may be extracted from package (2) and oscillate based on carriage (22) being set in motion through lever (20) by oscillator (25).
  • the heddle sorted and extracted from package (2) draws yarn (4) which reaches an advanced position with respect to the remaining yarns and may be taken up by the transferring means (32).
  • each heddle (3) is provided with an electromagnet (12) with the respective levers (14, 16) and tie road (15) and a return spring (19).
  • the transferring means (32), shown in Figure 3, comprises a cursor (33) which slides between two guides (34, 34'), activated by the second parallel axis oscillator (25') through a lever (35) and an orthogonal arm (36).
  • cursor (33) is constituted of a plate from metal or plastic material having a substantially parallelepipedal shape, provided at one end with a transversal through-hole wherein the shaft of an articulated joint (37) is inserted.
  • Guides (34, 34') are fastened to the bearing structure (1) and are formed by sections or rods from metal or plastic material.
  • Lever (35) is parallel to cursor (33) and is provided at the free end with a fork (38) wherein arm (36) orthogonal to said lever (35) and fixed to cursor (33) is inserted.
  • a spike (39) and a rod (40), adjustably tied at an angle to one another, are connected to the articulated joint (37).
  • the free end of rod (40) is slidingly fitted in a rotary bush (41) pivoted to a support (42) fixed to guide (34).
  • Spike (39) is provided at the free end with a cavity (43) for hooking the weft yarn (4) sorted and brought by the selection and shifting means (11).
  • the means for locking and cutting yarn (44), shown in Figure 4, has the function of locking yarn (4) fed by positioner (32), cutting and then positioning it for the insertion in loom gripper (5).
  • Said means for locking and cutting (44) comprises an L-shaped structure (45), pivoted on a pin (46) of the bearing structure (1) in correspondence of the free end of the longer vertical side.
  • Said L-shaped structure (45) can oscillate around pin (46) under the action of the third oscillator (25''), whose roller feeler (not shown in the figure) rotates around the surface of the conjugated cam (6'') and is integral with a lever (47) connected to the horizontal shorter side of said structure (45).
  • the L-shaped structure (45) can oscillate from its position nearer to the fabric to the one nearer to the trajectory of the bearing loom gripper (5) and vice-versa.
  • the surface of said horizontal shorter side, looking towards yarn (4), is provided with a mobile plate (48) slidingly connected to said surface by two pistons (49) and kept at a distance from the latter by compression springs (50).
  • a cursor slides (51), activated by the fourth parallel axis oscillator (25'''), whose roller feeler slides along the surfaces of the conjugated cam (6''') and is integral with a lever (52) fixed to the opposite end to said cursor (51).
  • the protruding free end of cursor (51) is bent at a right angle, so as to form a base (53) parallel and opposite to the mobile plate (48).
  • a cutting blade (54) is fixed to said L-shaped structure (45), in such a way as to protrude from its horizontal side to an extent a little shorter than the distance from the surface of said side and plate (48).
  • a further approaching of base (53) to plate (48) involves a further compression of springs (50) until yarn (4) gets in touch with the protruding blade (54) and is cut by the latter.
  • the L-shaped structure (45), with the cut and locked yarn is caused to oscillate by oscillator (24'') until the yarn is positioned in correspondence of the trajectory of the bearing loom gripper (5).
  • the sorting device of the present invention may also comprise a weft-guiding rod (55), preferably in correspondence of positioner (32). It allows to adjust and keep the trajectory of the weft yarn (4) in the fittest position for its hooking by positioner (32).
  • a weft-guiding support (56) is located having the function of keeping weft yarns in a fixed position relatively to the locking and cutting means (44).
  • Such support comprises a base (60), two protruding walls (58, 59) in correspondence of two adjoining sides of said surface and a groove (57) defined between said protruding walls.
  • One (59) of said walls is inclined and forms an edge (61) in correspondence of groove (57).
  • Edge (61) prevents weft yarn from going back.
  • Groove (57) keeps yarn in the right position to be hooked by the locking and cutting means (44).
  • a second conjugated cam oscillator (245') acts on the positioning means (32), shifting cursor (33) and causing rod (40) to rotate in bush (41).
  • spike (39) rotates and, together with hollow (43), hooks yarn from the selected heddle and positions it between plate (48) and base (53) of the locking and cutting means (44).
  • Base (53) is moved at the same time by the third conjugated cam oscillator (25'') until it locks and cuts the yarn.
  • the locking and cutting means (44) is thereafter caused to rotate by a fourth conjugated cam oscillator (25''') and feeds the cut yarn along the trajectory of the bearing loom gripper (5).

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP97830090A 1997-03-03 1997-03-03 Dispositif de sélection pour fils de trame Withdrawn EP0863237A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97830090A EP0863237A1 (fr) 1997-03-03 1997-03-03 Dispositif de sélection pour fils de trame

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97830090A EP0863237A1 (fr) 1997-03-03 1997-03-03 Dispositif de sélection pour fils de trame

Publications (1)

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EP0863237A1 true EP0863237A1 (fr) 1998-09-09

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EP97830090A Withdrawn EP0863237A1 (fr) 1997-03-03 1997-03-03 Dispositif de sélection pour fils de trame

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1016745A2 (fr) * 1998-11-16 2000-07-05 Lindauer Dornier Gesellschaft M.B.H Dispositif contrôlé d'amenée et de pincement de fil de trame pour métiers à tisser
WO2011015173A1 (fr) * 2009-08-07 2011-02-10 Lindauer Dornier Gesellschaft Mbh Dispositif pour transférer un matériau de trame en forme de bande
US8656962B2 (en) 2009-08-11 2014-02-25 Lindauer Dornier Gesellschaft Mbh Gripper head of a weaving machine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE646349A (fr) *
BE641519A (fr) *
DE2526766A1 (fr) * 1975-06-14 1976-09-09
DE3042053C1 (de) * 1980-11-07 1982-11-11 Lindauer Dornier-Gesellschaft Mbh, 8990 Lindau Schuetzenlose Webmaschine mit Schussfadeneintrag durch ins Webfach vorgeschobene und wieder zurueckgezogene Eintraggreifer
DE3124358A1 (de) * 1981-06-20 1983-02-17 Vaupel Textilmaschinen KG, 5600 Wuppertal "greifer-webmaschine"
GB2130608A (en) * 1982-11-25 1984-06-06 Dornier Gmbh Lindauer Shuttleless loom with weft thread insertion by reciprocating gripper systems
GB2233355A (en) * 1989-06-30 1991-01-09 Nuovo Pignone Spa Improved device of selection and presentation of the weft yarns for high-speed looms

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE646349A (fr) *
BE641519A (fr) *
DE2526766A1 (fr) * 1975-06-14 1976-09-09
DE3042053C1 (de) * 1980-11-07 1982-11-11 Lindauer Dornier-Gesellschaft Mbh, 8990 Lindau Schuetzenlose Webmaschine mit Schussfadeneintrag durch ins Webfach vorgeschobene und wieder zurueckgezogene Eintraggreifer
DE3124358A1 (de) * 1981-06-20 1983-02-17 Vaupel Textilmaschinen KG, 5600 Wuppertal "greifer-webmaschine"
GB2130608A (en) * 1982-11-25 1984-06-06 Dornier Gmbh Lindauer Shuttleless loom with weft thread insertion by reciprocating gripper systems
GB2233355A (en) * 1989-06-30 1991-01-09 Nuovo Pignone Spa Improved device of selection and presentation of the weft yarns for high-speed looms

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1016745A2 (fr) * 1998-11-16 2000-07-05 Lindauer Dornier Gesellschaft M.B.H Dispositif contrôlé d'amenée et de pincement de fil de trame pour métiers à tisser
EP1016745A3 (fr) * 1998-11-16 2004-03-03 Lindauer Dornier Gesellschaft M.B.H Dispositif contrôlé d'amenée et de pincement de fil de trame pour métiers à tisser
WO2011015173A1 (fr) * 2009-08-07 2011-02-10 Lindauer Dornier Gesellschaft Mbh Dispositif pour transférer un matériau de trame en forme de bande
CN102471956A (zh) * 2009-08-07 2012-05-23 林道尔·多尼尔有限责任公司 用于给出带状纬纱的装置
US8550123B2 (en) 2009-08-07 2013-10-08 Lindauer Dornier Gesellschaft Mbh Device for transferring a band-shaped weft material
CN102471956B (zh) * 2009-08-07 2014-06-25 林道尔·多尼尔有限责任公司 用于给出带状纬纱的装置
US8656962B2 (en) 2009-08-11 2014-02-25 Lindauer Dornier Gesellschaft Mbh Gripper head of a weaving machine

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