US3532135A - Arrangement for the selective presentation of weft yarns to weft inserting means - Google Patents

Arrangement for the selective presentation of weft yarns to weft inserting means Download PDF

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Publication number
US3532135A
US3532135A US724475A US3532135DA US3532135A US 3532135 A US3532135 A US 3532135A US 724475 A US724475 A US 724475A US 3532135D A US3532135D A US 3532135DA US 3532135 A US3532135 A US 3532135A
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yarn
holders
yarns
weft
arrangement
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US724475A
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English (en)
Inventor
Alexis Freihofer
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Ruti Machinery Works Ltd
Maschinenfabrik Rueti AG
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Maschinenfabrik Rueti AG
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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

Definitions

  • the present invention relates to an arrangement for the selective feeding or presenting of weft yarns of varying types to a yarn-receiving or transferring station, for the purpose of transferring the yarns to a receiving means and of picking them into a shed, the arrangement having, for each type of weft yarn, a separate yarn feeder or presenting means adapted to be displaced out of an inoperative or inactive position into a working position, i.e., a yarn transfer position.
  • the invention (in particular due to the fact that the yarn transfer movements are extremely rapid movements) is to satisfy the generally valid rule that a yarn once retained must not again be released by endeavouring to achieve at the yarn transfer station or point the most clearly defined position of a yarn. Since the present invention satisfies this rule to the maximum extent, it makes yarntransfer or yarn-receiving'reliable tothe optimum extent. Furthermore, twisting of the yarn or variable travel thereof, for example in the case of electrostaticcharges, is avoided.
  • the receiving means'to whichthe yarn is transferred whetherthe 'latter means be aweft yarn picking member, a device for the premetering of the lengths of .the weft yarns to .be picked or a drawing-in means for drawing the weft yarn into a shuttle, does not require to effect overtravel, which it would :have to do if the weft yarns of .the various types were tolbe transferred atnonidenticalpoints. Due to the above-mentioned,textremely shortperiod ofitime available to effect transfer, this factor is significant.
  • FIG. 1 shows a diagrammatic plan view of a weft yarn selector of the invention
  • FIG. 2 shows a lateral elevation of four suction nozzles serving as one set of yarn holders for the invention
  • FIG. 3 shows a perspective view of the driving mechanism or means for the suction nozzles shown in FIG. 4 and of an additional set of yarn holders;
  • FIG. 4 shows a lateral elevation of the four additional yarn holders shown in FIG. 3.
  • FIG. 1 shows the arrangement of the invention for the selective presenting of one of a plurality of weft yarns on a loom.
  • a yam-picking member in the form of .a shuttle 12.
  • the reed 13 serves for beating-up of the picked weft yarns.
  • the finished cloth is designated by the reference numeral 14.
  • Each weft yarn 15 to 18 travels over a specific one of the yarn clamps -19 to 22, a specific eyelet in the .carrier 42, a specific one of the first yarn holders 23 to 26 and a specific one of the second yarn holders or suction nozzles 28 .to 3 1.
  • the appropriate arrangement will be readily apparent from 7 FIG. 1.
  • the yarn 16 the v clamping .means 20, the yarn holder 24, and the suction nozzle 29.
  • Each of the yarn holders 23 to 26 has at its end aneyelet through which the appropriate weft yarns 15 to 18 are able to slide.
  • the eyelets are shown in FIG. 4' and are designated by the reference numeral 86.
  • FIG. 4 also shows the arrangement of the yarn holders 23 to 26, as seen in elevation.
  • FIG. 1 shows all the yarn holders 23 to 26and 28 to 31in their inactive position. The yarn-transferring position of the first yarn holders 23 to 26 and of the second yarn.
  • the suction nozzle 30 is in the receiving .position designated 38 in FIG. 1.
  • Each of the nozzles 28 ⁇ to 31 is secured to a guide member 40 adapted .toslide parallel to its longitudinal direction.
  • Each of the guide members 40 slides in a guideway 41 and is provided with a rack 43. The teeth of the rack mesh with the teeth of each one of the gear segments 44.
  • Each of the segments 44 is connected with one of the pivotal nozzles 28 :to 31 pass selectively towards the left from their inactive positions into their yarn-transferring and receiving positions.
  • the suction nozzles 28 to 31 are, together with the guide members 40 (-which carry :them) divided with uniform angular spacing over a sector of .a circle. Their longitudinal axes coincide ata point 46 (i.e., the longitudinal axes extend radially withrespecttto acenter point 46, are located :within a sectoruof a circle and are distributed .over the circle sectorwith uniform angular spacing). It will be-seen from FllG. 2 thatthe points at which .the yarns or threads 15 to I8 arein actual fact retained by the nozzles 28 10.31 i.e., the points of actual yarn-retaining, are :formed by the suctional apertures of the nozzles 28 10 31.
  • FIG. 3 shows, in perspective illustration, the nature of the drive means and of the control means for a gearwheel segment 44.
  • the segment is shown, again, with the shaft 45 to which it is fast.
  • FIG. 3 shows, furthermore, members 50 which, during the operation of the loom, carry out continuous pivoting movements about a pivot 51, so that the members constitute a continuously moved or actuated driving means.
  • the drive of the members 50 may be effected for example by means of a continuously rotating cam disc.
  • Secured onto the members 50 are two rollers 52 and 53 for actuation of the stubs 54 and 55.
  • the stubs 54, 55 are fast on the cylindrical displacement member 56.
  • Member 56 is pivotally coupled with the shaft 45 for rotation therewith and displaceable along the shaft, so that either the stub 54 or the stub 55 is able to pass into the zone of movement of the rollers 52 or 53.
  • the displacement of the cylinder 56 parallel to the shaft 45 is effected by the fork 57.
  • the fork is fast with another cylinder 58 which is adapted to be reciprocated parallel to its axis.
  • Cylinder 58 is subjected to a permanent pressure towards the left by a spring 59.
  • a magnet 60 exerts pressures or force against the influence of the spring 59, when the magnet is actuated.
  • a separate fork 57 and a separate magnet 60 is provided for each gear segment 44.
  • a profiled member 61 which follows the pivoting or rotating movements of the shaft 45.
  • the member 61 has the recesses 62 and 63.
  • the roller 64 is continuously pressed against the profiled member by means of the tension spring 65 and via the arm 67 pivotal about the pivot 66. This control arrangement therefore determines two pivoting positions of the shaft 45.
  • the end of the spring 65 is secured at a fixed point 68.
  • the gear segment 70 serves to move one of the first yarn holders 23 to 26 shown in FIG. 4.
  • the movement of the yarn holders 23 to 26 is achieved in the same manner as the movement of the suction nozzles 28 to 31.
  • a gear segment 70 is provided for each of the four yarn holders 23 to 26.
  • Each of the gear segments 70 meshes, via its teeth, with an associated rack 71 and each of the racks 71 is fast with a sliding member 72.
  • Each sliding member is slidable in a slideway 73, and each sliding member 72 carries, at one end, an arm 74, one of which is secured to the yarn holders 23 to 26 pivotal about a pivot 75.
  • Each of the yarn holders 23 to 26 has, as heretofore mentioned, an eyelet 86 through which the corresponding one of the yarns to 18 is guided.
  • the eyelets 86 are, therefore, the yarn-retaining retaining or guide means proper on the yarn holders 23 to 26 in which the yarn is actually guided.
  • the suction apertures of the suction nozzles 28 to 31 are moved into their transferring and receiving positions at a predetermined, identical point .46.
  • all the guide members 72 move towards a predetermined point 76, into their working positions, i.e., their paths of travel lie on straight lines which extend radially from the central point 76, are located within a sector of a circle and are distributed over the sector with uniform angular spacing. The movement of the guide members 72 is effected along predetermined travel paths.
  • the eyelets 86 are, with the exception of the eyelet of the yarn holder 23, laterally offset with respect to the radially extending straight lines due to the oblique extending direction of the arms 74.
  • the travel paths of the guide members 72 and the shape given to the arms 74 are so selected that the points of the yarn guide means proper, i.e., the eyelets 86 of the yarn holders 23 to 26, all travel to the same point, i.e., to the point 77, into their yarn-transferring position, when the yarn holders 23 to 26 are actuated. In this way, all the yarns 15 to 18 pass, when they are displaced into the transfer position, with their component parts disposed between the aperturesin the nozzles 28 to 31 and the eyelets 86 of the yarn holders 23 to 26, into identical or equal positions.
  • the yarn 15 travels, as can be seen from FIG. 1, through the eyelet 86 of the yarn holder 23 and its end is retained by or sucked into the suction nozzle 28.
  • the yarn 16 is retained by the elements 24 and 29, the yarn 17 by the elements 25 and 30 and the yarn 18 by the elements 26 and 31.
  • the corresponding yampresenting means In order to move one of the yarns 15 to 18 from the inactive position into a yarn transfer position, the corresponding yampresenting means is moved into its yarn transfer position, i.e., simultaneously, that one of the first yam holders 23 to 26 which carries the yarn and that one of the second yarn holders, i.e., that one of the suction nozzles 28 to 31, which carries the same yarn are guided into their transferring positions.
  • the transferring position of the yarn holders 23 to 26 is designated by reference numeral 88 and the transferring and receiving position of the suction nozzles 28 to 31 is designated by reference numeral 38.
  • the first and second yarn holders forming a yarn-presenting means are actuated by gear segments 44 and 70 arranged on the same pivot 45.
  • the pivot 45, shown in FIG. 3, and the gear segments 44, 70 may serve, for example, to actuate the suction nozzle 30 and the yam holder 25. In this manner the suction nozzles 28 to 31 and yarn holders 23 to 26 forming the same yarnpresenting means are always moved simultaneously.
  • the control means is so designed that in every case only one of the magnets 60 can be actuated. If, then, the suction nozzle 30 and the yarn holder 25 (and consequently the yarn 17 associated with these elements) require to be moved into the yarn transfer position, then the gear segment 44 associated with the suction nozzle 30 and the gear segment 70 associated with the yarn holder 25 are actuated. These segments are, as already stated, arranged on the same shaft 45. In order to illustrate operation of the invention, it can be assumed that these segments are the gear segments 44 and 70 shown in F IG. 3.
  • the magnet 60 remains actuated.
  • the roller 53 no longer contacts the stub 55 during its further movement, since the last part of the travel of the stub 55 is produced not by the roller 53 but by the movement of roller 64- along that component portion of its travel which it covers after passing over the raised portion or the dead center 49 until it reaches the recess 62.
  • This movement of the roller 64 is produced by the spring 65.
  • a change is necessary when a weft yarn of a different sort is e to be picked.
  • the spring 59 presses the cylinder 58, and the fork 57, towards the left.
  • the cylinder 56 is thereby also pressed towards the left and the stub 54 (the position of which corresponds to that shown in FIG. 3) passes into the path of movement of the roller 52 secured to the continuously actuated member 50.
  • Roller 52 presses the stub 54 rearwardly. In this way, the tooth segments 44 and 70 are again pivoted, but in this casein the direction opposite to that of the first pivoting movement.
  • the hook 32 is, after the arrival of the shuttle 12 into its right-hand inoperative position (this being the position of the shuttle 12 shown in FIG. I), displaced through the aperture 33 in the shuttle, forwardly into the position shown in FIG. I. In this way, the yarn, which is retained by the yarn-presenting means in the yarn transfer position, can
  • the hook 32 When the hook 32 again moves rearwardly and again out of the aperture 33, it draws the yarn with it through the aperture 33 in the shuttle 12. During this procedure, the clamp 21 is closed, so that the free end of the yarn is drawn out, of its suction nozzle 30. When the sley ll moves rearwardly again, in consequence of the shuttle drive which now takes place towards the left, the yarn is completely drawn off from the hook 32 and is transferred to a yarn-retaining means (not shown) disposed in the aperture 33 in the shuttle I2. Thereupon, the yarn clamp 2i opens and, from this instant on, the weft yarn is, as it is drawn off from the large supply source, picked into the shed.
  • the weft yarn carried by the shuttle I2 is drawn out of the shuttle.
  • the picked weft yarn is beaten up by the reed l3 traveling forwardly with the sley l1, and the shed is changed.
  • the weft yarn just picked is cut at the selvedge and the free end thus formed (which is connected with the yarn supply) is sucked into the nozzle disposed in the transfer position 38, and is thus retained.
  • each of the weft yarns 15 to 18 passes into exactly identical positions with its yarn length located between two yam-retaining means proper.
  • the yarns or threads should, at least within the zone of the yarn transfer point, i.e., in the immediatevicinity of the hook 32, have an accurately defined position which is always identical. In this way, optimum reliability of the yarn transfer is achieved and losing of the yarn during the yarn transfer is practically speaking impossible.
  • the suction nozzles 28 to 31 make an additional contribution to these advantageous conditions. Due to the provision of the nozzles, the result is achieved that the yarns 15 to 18 are each continually subjected to a tensioning force. If, for any reason whatsoever, a yarn is subjected to a pull for a short period of time and consequently becomes loose, its end is drawn somewhat out of the suction nozzle and is then once again drawn in by the nozzle.
  • the suction nozzles 28 to.3l thereby endeavour to always retain the yarns in the stretched conditions between the first yarn holders 23 to 26 and the nozzles 28 to 31 serving as the second yarn holders.
  • the paths over which the suction nozzles 28 to 31 and the yarn holders 23 to 26 travel during their actuation are, advantageously, designed to be of equal length. In this way, there is obtained a movement of the yarns arranged between the suction nozzles 28 to 31 and the yarn holders 23 to 26 which is parallel to itself. Consequently, the yarn disposed in the transfer position is cleanly separated from the others and no entanglement of the yarns takes place.
  • the elements such as, for example, the guide members 40 and 72, the tooth segments 44, 70 and the racks 42 and 71 may, under these circumstances, be designed to be identical, and advantageously this construction saves costs.
  • the receiving means is, as shown in FIG. I, a hook 32.
  • a corresponding pivoting of the yarn holders 23 to 26 is additionally effected.
  • the plates 78 shown in FIG. 4 are provided. Each plate is fast with its associated yarn holder 23 to 26 and is pivotal therewith about the appropriate pivot 75.
  • Associated with each of the plates 78 is one of the pins 79. All the pins 79 are arranged on a common plate (not shown) and are adapted to be displaced upwardly and downwardly due to movement of the plate. Shortly after the passage of the hook 32 through the aperture 33 (see FIG. 1), the pins 79 are displaced downwardly in rhythm with this hook movement.
  • An arrangement for selectively presenting one of a plurality of weft yarns to a'yarn transfer position for transferring the yarn to a means for picking the yarn into a shed of a loom comprising a plurality of yarn-presenting means, each yarn-presenting means being associated with one of the plurality of weft yarns for selectively presentirigan end portion ofits associated weft yarn to said transfer position, each of said yarn-presenting means comprising a first yarn holder and a second yarn holder disposed in spaced relationship relative to each other, each associated weft yarn extending with its end portion from one holder to the other, the first yarn holders having a yarn guide means and the second yarn holders having a yarn-retaining means, the first yarn holders, of said yarn-presenting means being so arranged in their yarn-transferring positions that the yarn guide means thereof are all displaced to a first predetermined point and the second yarn holders of said yarn-presenting means being so arranged that in their yarn-transferring positions the yarn-retaining means thereof are all displaced to a
  • each of the second yarn holders comprises a suction means enabling alternate engagement and release of the yarns.
  • each of the first yarn holders is carried by a guide member and is adapted to be displaced by movement of said member, the paths of movement of each guide member being located on straight lines extending radially from a central point, located within the sector of a circle and distributed over the said sector with equal angular spacing, and the paths of movement of the first yarn holders being of identical length, and with the exception of, at maximum, one of said yarn holders, the yarn guide means thereof are laterally offset by predetermined amounts relatively to the radially extending straight lines, so that the yarn guide means of the first holders are, in the transferring positions of the first holders, displaced from said central point.
  • suction means comprise suction nozzles having suction apertures which form the yarn-retaining means of the second yarn holders, the second predetermined point identical in the yarn-receiving position of each of said suction apertures, being located in the vicinity of the cloth beatup and of a selvedge, and at this last mentioned position the woven-in weft yarns ends, which are still connected with the yarn supply, are located in the suction zone of said suction nozzles.
  • said means for actuating said first and second yarn holders includes a guide member for moving each of the first yarn holders to said first predetermined point and back again to an inactive position, and actuating means for each first yarn holder for causing said holder to have supplementary pivoting movements relative to its associated guide member, said pivoting movements being coordinated with the movements of a receiving means for receiving the end portion of a weft yarn moved to said transfer position whereby the reliability of the transfer to said receiving means is increased.
  • first yarn holders are pivotally carried by the guide members and are disposed, in their yam-transferring position, in the path of movement of an actuating member of said actuating means and are adapted to be pivoted by the actuating member within an entrainment zone of the receiving means, the actuating member operating in rhythm with the movement of the receiving means.
  • An arrangement for selectively presenting one of a plurality of weft yarns to a yarn transfer position for transferring the yarn to a means for picking the yarn into a shed of a loom comprising a plurality of yarn-presenting means, each yarn-presenting means being associated with one of the plurality of weft yarns for selectively presenting an end portion of its associated weft yarn to said transfer position, each of said yam-presenting means comprising a first yarn holder and a second yarn holder disposed in spaced relationship relative to each other, each associated weft yarn extendv ing with its end portion from one holder to the other, the first yarn holders having a yarn guide means and the second yarn holders having a yarn-retaining means, the first yarn holders of said yarn-presenting means being so arranged in their yarntransferring positions that the yarn guide means thereof are all displaced to a first predetermined point and the second yarn holders of said yarn-presenting means being so arranged that in their yam-transferring positions the yarn-retaining means thereof are all displaced to a

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US724475A 1967-05-09 1968-04-26 Arrangement for the selective presentation of weft yarns to weft inserting means Expired - Lifetime US3532135A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH662267A CH450315A (de) 1967-05-09 1967-05-09 Anordnung zum wahlweisen Zubringen von Schussfäden verschiedener Art an eine Fadenübernahmestelle

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2940202A1 (de) * 1979-10-04 1981-04-16 Institute für Textil- und Faserforschung Stuttgart, 7410 Reutlingen Webmaschine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1043098B (it) * 1975-10-03 1980-02-20 Somet Soc Mec Tessile Presentatrice della trama per te lai di tessitura ad alimentazio ne continua della trama
BE1003978A3 (nl) * 1989-05-18 1992-07-28 Picanol Nv Inrichting voor het presenteren van inslagdraden bij weefmachines.
IT1248715B (it) * 1990-06-11 1995-01-26 Vamatex Spa Dispositivo di presentazione della trama per telai di tessitura a pinze

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2940202A1 (de) * 1979-10-04 1981-04-16 Institute für Textil- und Faserforschung Stuttgart, 7410 Reutlingen Webmaschine
US4406312A (en) * 1979-10-04 1983-09-27 Aktiengesellschaft Adolf Saurer Apparatus for selecting a number of weft threads at weaving machines

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CH450315A (de) 1968-01-15
GB1180502A (en) 1970-02-04

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