US3444900A - Arrangement on a loom for selecting and drawing off weft yarn to a predetermined length - Google Patents

Arrangement on a loom for selecting and drawing off weft yarn to a predetermined length Download PDF

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Publication number
US3444900A
US3444900A US645130A US3444900DA US3444900A US 3444900 A US3444900 A US 3444900A US 645130 A US645130 A US 645130A US 3444900D A US3444900D A US 3444900DA US 3444900 A US3444900 A US 3444900A
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yarn
arrangement
loom
movement
weft
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US645130A
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English (en)
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Heinrich Schaffer
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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

  • This invention relates to an arrangement on a weaving loom for supplying yarn or thread pieces of pre-determined length to be individually picked into a weaving shed, and more particularly to such an arrangement provided with an extractor means for drawing-out yarns which travel from a yarn supply over a yarn feeding means and which are adapted to be displaced by the feeding means into the path of the extractor means.
  • the weft yarn to be picked into the shed is taken directly from a yarn supply arranged externally of the loom, it is known to determine the length of the weft yarn before it is introduced into the shed.
  • the yarn as it is drawn oif from a yarn supply is drawn out by an extractor device perpendicular to the sley race and the free end of the yarn is retained by a yarn clamping means.
  • the clamping means is then released and the point on the yarn defining the measuredoff length of the yarn is retained by a second clamping means.
  • the weft yarn is then, after travelling round the reversing point on the shuttle, picked into the shed.
  • this invention provides an arrangement whereby the pre-measun'ng of the yarn always produces the same yarn length, immaterial of what sort of yarn is used. If the pre-deterrnined lengths of thread or yarn were to vary, depending on the sort of thread or yarn this would, for example, have a disadvantage of producing an undesirable yarn wastage.
  • This invention is characterized in that a yarn with drawing means is provided for the drawing-out of the 3,444,900 Patented May 20, 1969 "ice yarns or threads offered by the yarn feeding means in a direction opposite to that of the traction or drawing movement of an extractor member, and in that the yarn feeding means comprises a plurality of separate yarn feeders which, for the purpose of offering a yarn to the extractor member, are adapted to be selectively displaced towards positions located approximately on the path extending between the extractor member andthe yarn withdrawing means when the extractor member and the yarn with drawing means are in the outermost extraction position.
  • a further advantage is achieved that, with appropriate control or regulation thereof, in combination with a yarn clamping means, a neat yarn cutting action and feeding of the cut end of the yarn to the picking member becomes possible with the aid of simple transfer means. Due to this simple form of feeding, there is furthermore achieved the advantage that, by varying the amount of drawing-out effected by the yarn withdrawing means on a given loom, an extremely simple adjustment to various fabric widths becomes possible. By movements of varying magnitudes towards the exterior of the cut yarn end, it is possible to displace the yarn end to the rest position of thepicking member (which position never changes) on the given machine.
  • FIGURE 1 shows a perspective and diagrammatic view of the arrangement according to the invention for determining or supplying yarn pieces of pre-determined length and for transferring the lengths to a picking member;
  • FIGURES 2 through 5 show successive working phases of the arrangement of the invention shown in FIGURE 1.
  • weft yarns or threads 23, 24 and 25 there are three different sorts of weft yarns or threads 23, 24 and 25. These are of a different nature, for example, the three yarns may be of different colors.
  • the weft yarns 23, 24 and 25 travel from supply bobbins (not shown) from the left-hand side of the apparatus.
  • the yarns travel from the bobbins over a braking arrangement (not shown), over the guide rods 73, 74 and through the apertures in the riders 15, 16 and 17, through additional apertures 26, 27 and 28, and from the latter through eyelets in the yarn feeders 46, 47 and 48, to the fabric 70.
  • Each of the riders 15, 16 and 17 is lifted during the drawing-out of its associated yarn 23, 24
  • a programme-controlled control device (not shown) actuates the yarn feeders 46, 47 and 48. Actuation of, for example, the yarn feeder 46 displaces it in the downward direction as shown in FIGURE 2. In this actuated position, the weft yarn 25 offered by the yarn feeder 46 is engaged by the drawing-out member 43, 44.
  • the yarn feeders 46, 47, 48 may be actuated by associated electro-magnets (not shown) being drawn downwardly against the tension of springs 78, 79, 80.
  • an elongated plate 19 also extends in the center of and along the profile rail 41.
  • the elongated plate 19 is adapted to be reciprocated upwardly and downwardly, parallel to itself, by lever arrangements attached at both its ends.
  • lever arrangements 20 provided on the right-hand side of the loom, i.e. on the left-hand side in the drawings, is shown.
  • Bristles, fur, plush or the like fibrous material 18 are provided over the elongated plate 19 and are supported on a carrier 29 secured to the frame of the loom.
  • the elongated, displaceable plate 19 bears or comes into contact with the bristles 18 when in its raised position.
  • a yarn clamping means 12 is mounted fast on the profile rail 41. As shown in FIGURES 3 and 4, relative to the yarn 25, the rail serves to retain the yarn which has been engaged for the purpose of measuring-oh to the desired lengths.
  • the control of this clamping means is effected via the rod 52.
  • the lever 82 which is pivotal about the pivot 81, is pivoted clockwise against the pull of a spring 56.
  • This arrangement or means comprises the transfer member formed with the slot 54, an air feed duct 30, by which air is blown out of the nozzle 53, whereby the end 83 (shown in broken lines in FIGURE 4) of the weft thread 25 to be picked is blown through a transfer point or aperture 33 in the shuttle 32.
  • a suction device 36 may also be provided.
  • the insertion member 55 is provided for the introduction of the end 83 of the yarn 25 into the slot 54.
  • This latter member is designed as a rocking lever having a hook at its free end.
  • the spring 57 retained on the member 10 tends to rotate the pivot or shaft 58 in a direction such that the hook of the inserting member 55 moves clockwise and downwardly, so that a yarn engaged by the hook is guided into the slot 54.
  • the pivot 58 can be pivoted by means of the linkage 60, 61 and 62.
  • the rocking lever 55 is so positioned that it engages each of the yarns offered by one of the three yarn feeders or feeding devices 46, 47 and 48.
  • the control means for the rocking lever 11 includes rod 59 as shown in the drawings.
  • the control means is such that the rocking lever 11 carries out a first partial movement in the anti-clockwise direction, i.e. during its first partial movement, the hook thereof moves, in the drawing, to the left (see FIGURE 2). In a second partial movement the hook again moves somewhat towards the right (see FIG- URE 3). It then pivots, as shown in FIGURE 4, during a third partial movement, vigorously towards the left, that is in an anticlockwise direction in the drawing, whereupon (see FIGURE 5) it pivots back during a fourth partial movement, by the amount of a portion of the third movement. During its fifth partial movement, the hook again returns into its starting position.
  • a movement of this kind can be produced for example by controlling the rod 59 with the aid of an appropriate cam disc.
  • a yarn monitoring device 13 which device is so arranged that the drawn-out yarn, for example the yarn 25, takes up a position over the monitoring device 13, as in the working phase illustrated in FIGURES 3 and 4.
  • the monitoring device 13 is so designed that on the one hand it produces a shut-down signal when no yarn is available over it (in the working phase illustrated in FIGURE 4), and, on the other hand, it produces a shutdown signal if, after the yarn pick has been completed, (i.e. after the working phase according to FIGURE 5), yarn is present over it.
  • the mode of operation of the yarn monitoring device 13 is such that, due to action of the cam 85 on the member 86, the small plates 35 are periodically lowered between the small plates 31. In this way, the presence and absence of a yarn is indicated, via the device 13, and in this manner the desired shutdown signals can be produced.
  • the pivot 61 which is adapted to be pivoted in the cadence of the loom operation.
  • the pivot 61 carries out a complete operational pivoting movement for every pick of a weft yarn from the left to the right in the drawings, i.e. from the right to the left on the loom.
  • the driving rod 60 is displaced upwardly. Consequently, the rods 52 and 62 move downwardly, thus producing a pivoting movement of the book as the inserting member 55 towards the slot 54 and movement of the lever 82 of the clamping means 12 in the downward direction.
  • the drawing-out member 43, 44 is secured to the driving belt 45. Due to the driving of the belt, the drawing-out member 43, 44 is displaced along the profile rail 41. On the side of the loom which is not shown, there is a second drawing-out member for determining the lengths of the weft threads to be picked from the other side. It is advisable to drive both drawing-out members by means of the same belt 45. In this way, the advantage is obtained that, for the drawing-out step, practically a complete working period of the loom is available.
  • one of three three yarn feeders 46, 47 or 48 is first actuated by a programme-control arrangement.
  • the yarn feeder 46 is moved downwardly in the example illustrated.
  • the yarn 25 (guided through the aperture 28 and the eyelet of the yarn feeder 46) travels downwardly.
  • the pivot 61 is correspondingly rotated. Consequently, the rods 52 and 62 move downwardly.
  • the pivot 58 is rotated by the movement of the rod 62, so that the inserting member 55 engages the weft yarn 25, guides the yarn to the slot 54, and inserts the yarn therein.
  • the drawingout step for the weft yarn 25 commences. This is effected by the drawing-out member 43, 44. During this step, the yarn required is drawn off from a supply bobbin which is not shown.
  • the yarn 25 is also engaged by the hook of the rocking lever 11.
  • the control of the lever 11, as a first partial movement, produces the pivoting thereof in the counter-clockwise direction. This working phase is not shown in FIGURE 2. Meanwhile, due to the downward movement of the rod 52, the lever 82 of the yarn clamping means 12 has also partially descended.
  • the weft yarn monitoring device 13 has opened, i.e. the small plates 35 are in the lifted position.
  • the yarn 25 has already been drawn out to a considerable extent.
  • the yarn clamping means 12 has completely closed.
  • the rocking lever 55- remains in abutment against a stop in its lower position.
  • the rocking lever 11 of the yarn withdrawing means is, on the other hand, so controlled that, as a second partial movement, it carries out a small rearward pivoting movement, i.e. clockwise in the drawing. Since the yarn 25 is now held fast by the clamping means 12, its section between the clamping means 12 and the fabric 70 becomes somewhat loose. Meanwhile, the lever 21, with the cutting device 22 and the yarn separator 51, has been pivoted in the forward direction as shown in the drawing.
  • the yarn brake 40 exerts a relatively weak braking effect on the threads drawn through it.
  • the purpose of the brake is to avoid twisting or curling of the yarn during the withdrawal of the yarn end immediately after cutting by the scissors member 22.
  • the position of the yarn 25 corresponding to this working phase is shown in full lines in FIGURE 4.
  • the rocking lever 11 moves, in a fourth partial movement, into the position shown in broken lines in FIGURE 4, wherein also the yarn 25 extends as shown in broken lines. It can be seen that, during the return movement or fourth partial movement of the rocking lever 11, the yarn end 83 has been blown through the transfer aperture 33 in the shuttle 32. This step is further assisted by the suction device 36 into which, as shown in FIGURE 4, the yarn end 83 is sucked.
  • the pivoting of the fourth partial movement is smaller in quantity than the pivoting of the third partial movement.
  • the yarn end 83 is retained by the clamping means 37.
  • the driving rod 60 again travels downwardly and the shaft 61 begins to pivot in the opposite direction of rotation. Consequently, the clamping means 12 opens simultaneously with the propulsion of the shuttle 32 and picking commences.
  • the elongated plate 19 is raised by the lever arrangement 20 and the corresponding arrangement on the other loom side. Since, at this instant, the drawing-out member 43, 44 has already moved somewhat towards the left hand side, (as viewed in the drawing), clue to the lifting of the plate 19, the drawn-out yarn is released by the drawing-out member 43, 44. The picking of the weft yarn 25 into the shed 71, 72 then commences.
  • the shuttle 32 which is now again travelling through the shed and in which the yarn 25 is clamped by the clamping means 37, draws the yarn 25 into the shed 71, 72; the hairpin-shaped portion of yarn 25 which has been measured-off lengthwise being drawn after the shuttle.
  • This procedure is shown in FIGURE 5.
  • the rocking lever 11 is, in the course of a fifth partial movement, pivoted back once more into its starting position.
  • the plate Due to the raising of the elongated plate 19, the plate contacts the bristles 18 which are arranged above it and secured to the carrier 29.
  • the bristles 18 ensure that, during the picking of the weft yarn 25 into the shed, the hairpin-shaped portion of the yarn which has been supplied at the pre-determined length does not twist or form loops.
  • this means is in its open position in the working phase shown in FIG- URE 2.
  • the yarn 25 takes up a position over the small plates 31.
  • the weft yarn 25 prevents plates 35 from being able to descend completely between the small plate 31.
  • the mode of operation of the yarn monitoring means 13 is such that under these conditions no stop signal is produced.
  • the weft yarn 25 is introduced into the shed during the picking up step shown in FIGURE 5, the small plates 35 are again lifted. After the re-descent of the plates 35, following this lifting movement,
  • the mode of operation of the monitoring means is such that the complete descent of the small plates 35 in this working phase does not produce a stop signal, but that a signal of this kind is produced if the small plates 35 do not descend.
  • the pre-determination of the length by the drawing-out member 43, 44 might, in accordance with the dilferent characteristics of the weft yarns, produce diiferent lengths.
  • the riders 15, 16 and 17 are provided. Each of the various weft yarns 23, 24 or 25 travels through one of the eyelets of the riders 15, 16 and 17.
  • an arrangement which brakes the yarns, is disposed between the riders 15, 16 and 1.7 and the yarn supply bobbins, also not shown.
  • the rider of the yarn acted upon by the drawing-out member is then lifted.
  • the rider 17 is lifted.
  • the rider again descends, until it again bears on the stop 14. Due to this descent of the rider, the drawn-out yarn is again shortened by the amount resulting from the lowering of the rider.
  • the heights of the riders 15, 16 and 17 or of the eyelets thereof may be adjusted as desired by the displaceable sleeve 75, 76 and 77.
  • the amount by which the given yarn is again withdrawn may be adjusted when desired and also be adapted to the character of the yarn.
  • the predetermination or measuring-off of the length of the picked weft yarn 25 is effected above all by the drawing-out member 43, 44 which draws out the yarn 25 towards the right in the drawings.
  • the pre-determination of the length is also determined by the drawingout movement of the rocking lever 11 of the yarn withdrawal means (and of the inserting member 55), which is directed towards the left in the drawings.
  • a further advantage of the arrangement of the invention is also to be seen in the fact that the weft yarn to be picked has only a single deflecting point.
  • This deflecting point is the hook on the lever 11 of the yarn withdrawing means which, furthermore, moves back into its starting position in the course of its fifth partial movement which takes place during the picking of the Weft into the shed.
  • these apertures are advantageously given a direction which is substantially parallel to the general direction of the yarn 25 located on the forward side of the arrangement (as shown in the drawings) relatively to the profile rail 41 between the drawing-out member 8 and the hook of the withdrawing means.
  • these apertures can simply be made as large as possible.
  • the adhesion of or the holding effect on the yarn 25 can be achieved by an arrangement in which the yarn is held by a suctional elfect against the upper face of the profile rail 41.
  • apertures as shown in FIGURE 4 may be connected with a suction device may be arranged on the profile rail 41.
  • Such apertures may be arranged along the entire length of the loop in the yarn 25 formed by the drawing-out member 43, 44.
  • suction apertures are provided only at the locality of that half of the drawn-out loop which extends between the hook 43 and the eyelet 28, i.e. only at the place of that half of the loop which is positioned forwardly relatively to the loom.
  • the suctional effect at the apertures may be kept weak for the above-described purpose of achieving the desired adhesion.
  • An arrangement on a loom for selecting and drawing oif weft yarns to a predetermined length to be picked individually by a picking member into a weaving shed comprising an extractor member for drawing out yarn, said extractor member being moveable along a path and said yarns extending from a yarn supply via a yarn feeding means to a selvedge of a fabric being formed and being adapted to be separately displaced by said yarn feeding means into the path of the extractor member, and a yarn withdrawing means operating to draw a portion of the yarn offered by said yarn feeding means in a direction opposite to that of the extractor member;
  • the yarn feeding means comprising a plurality of separate yarn feeders, which when oflFering a yarn to said yarn withdrawing means are adapted to be selectively moved towards positions located at least approximately on a path extending between the extractor member and the yarn withdrawing means in their respective outermost extraction positions.
  • the arrangement of claim 2 further comprises a cutting device for cutting said portion of the yarn at the selvedge and control means for controlling movement of the yarn withdrawing means, the movement of said yarn withdrawing means comprising as its first partial movement, a drawing-out movement when the yarn clamping means is opened, and when the yarn clamping means is closed and before cutting of the yarn a second partial movement which is smaller than and which takes place in a direction opposite to the first partial movement as its third partial movement a further drawing-out movement which, after cutting of the yarn and after closing of the yarn clamping means, is such that the severed yarn end is moved away from the selvedge by a predetermined amount, and a fourth partial movement which is smaller than and which takes place in a direction opposite to that of the third partial movement.
  • control means also causes said yarn withdrawing means to have a fifth partial movement which when the yarn clamping means is opened and after commencement of the yarn picking movement by the picking member, moves said withdrawing means back to its starting position adjacent to said yarn feeding means.
  • said transferring means includes a blowing nozzle with a blowing action directed towards a transfer aperture in the picking member disposed in its rest position.
  • the arrangement of claim 3 further comprises a yarn separating means operably associated with said cutting device for guiding the yarn being picked to the cutting device.
  • the yarn withdrawing means comprises a rocking lever provided at its free end with a hook and pivotable in a vertical plane that extends parallel to the path of the extractor member, said rocking lever being arranged relative to the yarn feeding means so that upon movement of said lever in a counterclockwise direction said hook will engage each of the yarns displaced successively by the yarn feeders into the path of the extractor member.
  • the extractor member comprises two books and said means for releas ing the drawn-out yarn from said extractor member comprises an elongated plate which extends between the hooks and which is adapted to be reciprocated upwardly and downwardly and a controlled lever mechanism for displacing the plate above the height of the hooks after drawing out of the yarn and for displacing the plate below the height of the books after picking of said yarn by the picking member.
  • the arrangement of claim 12 further comprising fibrous material arranged above the elongated plate so that the plate contacts said fibrous material when the plate is displaced upwardly by said lever mechanism.
  • the arrangement of claim 1 further comprising weft yarn monitoring means positioned to the side of the path of the extractor member over which the drawn-out yarn is positioned in the first working phase of said arrangement and from which the yarn is drawn away in a second working phase during picking of the yarn by said picking member, said monitoring means producing a stop signal when no yarn is positioned above it in the first working phase and when yarn is positioned above it in the second working phase.

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  • Textile Engineering (AREA)
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US645130A 1966-06-22 1967-06-12 Arrangement on a loom for selecting and drawing off weft yarn to a predetermined length Expired - Lifetime US3444900A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH906766A CH441150A (de) 1966-06-22 1966-06-22 Anordnung an einer Webmaschine zum Erstellen von Fadenstücken vorgegeberner Länge

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US3444900A true US3444900A (en) 1969-05-20

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US (1) US3444900A (de)
BE (1) BE700149A (de)
CH (1) CH441150A (de)
DE (1) DE1710311A1 (de)
GB (1) GB1124557A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3921677A (en) * 1972-07-27 1975-11-25 Voest Ag Flat weaving machine
US3951177A (en) * 1973-11-06 1976-04-20 Nuovo Pignone S.P.A. Devices for folding into the warp shed both ends of a weft thread in a fabric made by a shuttleless loom having a continuous weft supply mechanism
US4114658A (en) * 1976-03-01 1978-09-19 Vladimir Fomich Trubin Mechanism for compensating the length of a weft thread for a loom
US4197882A (en) * 1977-08-18 1980-04-15 Nissan Motor Company, Limited Fluid jet shuttleless loom with resistance providing means for weft yarn
US4534161A (en) * 1983-01-24 1985-08-13 Monsanto Company Ring spinning processes for converting sliver to carpet yarn
US20150113777A1 (en) * 2013-10-25 2015-04-30 Shaw Industries Group, Inc. Cutter assembly for stretched yarn

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH654601A5 (de) * 1982-04-07 1986-02-28 Sulzer Ag Schussfadenspannvorrichtung fuer webmaschinen, insbesondere greiferpojektil-webmaschinen.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2052655A (en) * 1932-12-31 1936-09-01 Celanese Corp Shuttleless loom and weft supply mechanism therefor
US2902058A (en) * 1954-12-17 1959-09-01 Chicopee Mfg Corp Looms
GB1040512A (en) * 1964-01-23 1966-08-24 Sulzer Ag Improvements in gripper shuttle looms

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2052655A (en) * 1932-12-31 1936-09-01 Celanese Corp Shuttleless loom and weft supply mechanism therefor
US2902058A (en) * 1954-12-17 1959-09-01 Chicopee Mfg Corp Looms
GB1040512A (en) * 1964-01-23 1966-08-24 Sulzer Ag Improvements in gripper shuttle looms

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3921677A (en) * 1972-07-27 1975-11-25 Voest Ag Flat weaving machine
US3951177A (en) * 1973-11-06 1976-04-20 Nuovo Pignone S.P.A. Devices for folding into the warp shed both ends of a weft thread in a fabric made by a shuttleless loom having a continuous weft supply mechanism
US4114658A (en) * 1976-03-01 1978-09-19 Vladimir Fomich Trubin Mechanism for compensating the length of a weft thread for a loom
US4197882A (en) * 1977-08-18 1980-04-15 Nissan Motor Company, Limited Fluid jet shuttleless loom with resistance providing means for weft yarn
US4534161A (en) * 1983-01-24 1985-08-13 Monsanto Company Ring spinning processes for converting sliver to carpet yarn
US20150113777A1 (en) * 2013-10-25 2015-04-30 Shaw Industries Group, Inc. Cutter assembly for stretched yarn
US9862564B2 (en) * 2013-10-25 2018-01-09 Columbia Insurance Company Cutter assembly for stretched yarn
US10011455B2 (en) * 2013-10-25 2018-07-03 Columbia Insurance Company Cutter assembly for stretched yarn

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CH441150A (de) 1967-07-31
DE1710311A1 (de) 1971-11-04
BE700149A (de) 1967-12-01
GB1124557A (en) 1968-08-21

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