US3422858A - Weft nipper for circular looms - Google Patents

Weft nipper for circular looms Download PDF

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Publication number
US3422858A
US3422858A US579080A US3422858DA US3422858A US 3422858 A US3422858 A US 3422858A US 579080 A US579080 A US 579080A US 3422858D A US3422858D A US 3422858DA US 3422858 A US3422858 A US 3422858A
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United States
Prior art keywords
weft
nipper
arm
shaft
roller
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Expired - Lifetime
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US579080A
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English (en)
Inventor
Armand Malchair
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Peltzer et Fils SA
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Peltzer et Fils SA
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D37/00—Circular looms
    • 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 circular looms capable of producing fabrics having weft threads variable as regards nature, quantity and color. More particularly, this invention has for an object a weft-nipping device capable of bringing the weft threads, at a rate proportional to that at which the fabrics are made, into the trajectory of weftdrawing devices intended to pass the picks in correct lengths and at correct positions into successive sheds. Additionally, this weft-nipping device is capable of cooperating with a selector device able to feed it with weft threads of a nature, quantity and/or color predetermined in accordance with the fabric to be manufactured. This weft nipper also cooperates with the cutting-off device of the selector in such manner that the picks intended to be carried and moved by the weft-drawing device have a properly predetermined length.
  • An important object of the invention relates to a weftnipping device of this type which is capable of being readily interposed between a selector device and a weftdrawing device, so that the rapid feeding of the latter is assured irrespective of the pattern and the colours of the fabrics to be woven.
  • the selector device is preferably of the type described in the co-pending patent application Ser. No. 579,079, while the weft-drawing device is preferably of the type disclosed in the co-pending patent application Ser. No. 579,097.
  • a suitable selector device is also disclosed in the British patent to Slot, No. 435,061.
  • the weft-nipping device substantially consists in the combination of a support in the form of a crosspiece extended by an oscillating arm overhanging the path of the weft-drawing devices, said oscillating arm carrying, at its end, the gripping means proper normally maintained in the open position by the selector at the point of the feed means for the weft threads.
  • FIGURE 1 is a schematic plan view of a circular loom using the weft-nipping device forming the object of the invention
  • FIGURE 2 is an enlarged schematic section on the line IIII of FIGURE 1;
  • FIGURE 3 is an enlarged view of the portion indicated at F3 in FIGURE 1;
  • FIGURE 4 is an enlarged view of the portion indicated at F4 in FIGURE 3;
  • FIGURE 5 is a section along the lines V--V of FIG- URE 3;
  • FIGURE 6 is an enlarged view of the part indicated at F6 in FIGURE 5
  • FIGURES 7, 8 and 9 represent sections respectively along the lines VII-VII, VIIIVIII and IX-IX of FIGURE 6;
  • FIGURE 10 is a schematic representation of a part of the rotating control equipment
  • FIGURE 11 is a diagram of an electrical circuit.
  • FIGURES 1 and 2 there are shown, diagrammatically the essential elements of the loom using the weft-nipping device according to the invention, indicated by F3 in FIG. 1, namely, the main frame 1, the warp beams 2, the sheets of warp threads 3, the heald frame units 4, the selector 5, the weft drawing devices 6, the cloth take-up rollers 7, the rotating equipment 8 and its general driving mechanism 9.
  • the main frame 1 is arranged according to the number of sections forming a complete weaving unit, in the present case three, enabling three fabrics to be woven independently of each other, and of a quality and in designs which may be the same or different.
  • This main frame is arranged so as to be able to carry perfectly all the fixed and moving elements of the loom as well as the beams and the fabric, with their respective mechanisms and their respective unrolling and rolling gear.
  • annular platform 10 supported upon said main frame 1, an annular platform 10, enabling the loom to be permanently overseen and permitting easy access to its principal mechanisms.
  • the beams 2 are arranged in the conventional manner on beams so that they can be readily engaged and disengaged from their support, shown diagrammatically at 11, these supports as well as the rolling mechanisms (not shown) for the beams being also known per se.
  • the sheet 3 of warp threads are, in the present case, conveyed and guided by return drums and support elements 121314-1516, so that said warp threads always have a practically constant tension.
  • the warp threads then pass into the shed forming device shown schematically at 4, and operated by a suitable heald frame motion (not shown).
  • the Weft-drawing device is shown schematically at 6, as being moved in the shed, whereupon the fabric is beaten-up and supplied to the roller 7 in known manner.
  • Such a combination forming, as it were, a loom in itself, is positioned around the longitudinal axis of the loom in a symmetrical manner, and there is maintained between them a gap in which are arranged the mechanisms of the selector, the weft nipper, the selvedge-forming unit and the other auxiliary devices.
  • the circular loom has been divided into six angular zones covering and alternately, arranged in zones of 30 and indicated at A and B in FIGURE 1.
  • the zones A correspond to the selecting and preparing zones for the weft threads, while the zones B correspond to the weaving zones proper.
  • the subject of the invention concerns more particularly the weft-nipping device shown schematically at F3 and also being positioned in the zones A.
  • This weft-nipping device comprises two essential parts, namely, a crosspiece 17 with its mechanism for imparting alternate angular movements and the gripping head 18 mounted at the end of said crosspiece.
  • the crosspiece 17 is, in this case, comprised of a profiled horizontal arm 19 carried by the bolts 20 on the main frame 1 of the loom.
  • this arm Towards its rear end, this arm is traversed by a vertical shaft 21 supported on roller bearings 22 and extending beyond the upper plane of said arm and carrying on this projecting portion a pulley 23 the hub of which butts against a cap 24 fixed to the shaft 21, in this instance by a screw 25.
  • the pulley 23 which is hollow, contains a spiral return spring 26, one end of which is fixed at 27 to said pulley, while the other end is fixed to a pin 28 integral with the arm 19.
  • the shaft 21 is connected by a sleeve 29 and screws 30 to a second lower coaxial shaft 31.
  • a roller bearing 32 housed in the corresponding portion of a tubular support 33 fixed by any suitable means, to a small support 34, which is connected firmly to the main frame 1 of the loom by means of screws 35.
  • a lever On the lower projecting end of the shaft 31, there is keyed, by means of a pin 36, a lever consisting of two parts 37-38 interconnected by a screw 39, the arrangement being such that the length of this lever can be fully regulated.
  • the free end of this lever serves as a bearing for the shaft 40 of a roller 41, said shaft being held in position by a screw 42.
  • This roller is permanently urged by the action of the spiral spring 26 against a cam 43 integral with the rotating equipment 8.
  • the cam 43 can either extend around the rotating equipment 8, in the present embodiment in the form of twelve identical and equidistant protuberances, or there can be fitted on the moving equipment 8 twelve separate earns which have the same profile and are equidistant from each other.
  • the pulley 23 may also for control requirements be formed in two parts joined by screws 44 so that the two parts constituting the pulley can be adjusted angularly.
  • a shaft 46 extending upwardly.
  • a pulley 48 of the same diameter as the pulley 23.
  • the pulley 48 is surmounted by a base 49, fixed by bolts 50 and also housing roller bearings 51 upon which is supported the upper portion of the shaft 46.
  • the head 18, is carried at the end of the arm 19 by the base 49.
  • This head includes in the illustrated arrangement, an arm 60, which preferably forms a single piece with the base 49, or can be fixed thereto.
  • the free end of the arm 60 carries a tubular guide 61, the bore 62 of which is extended to the two ends of the guide 61 by passages 63-64 respectively, of rectangular cross-section.
  • Engaged in the guide 61 by a light friction fit is a rod 65, having a section in the form of a U, and having its lower end profiled so as to form one of the jaws 66 of the weft nipper, the second jaw 67 forming the lower part of a second rod 68, engaging gently by friction in the first rod 65.
  • each of the rods 65-68 has an orifice 71-72 respectively. Over a large part of its height, the rod 68 can be hollowed out as shown at'73 for the purpose of reducing the dead weight.
  • each of the orifices 71-72 there is engaged the profiled end 74-75 forming part of a cranked lever, 76-77 respectively.
  • These two cranked levers are also engaged between the two side-plates 78-79 of a head 80 having a section in the form of a U and secured, by means of a screw 81, to the end of a rod 82.
  • the side-plates 78-79 each have a medial oblong opening, 83-84 respectively,
  • the levers 76-77 carry near their adjacent parts, the ends of the shafts, 89-90 respectively, engaged by their free end in the medial oblong orifices 83-84.
  • the head 80 is inserted in a U-shaped support 91 fixed in the underlying part of the arms 60 by means of a screw 92 and of pegs 93-94.
  • the support 91 has a U section, the two arms 95-96 of which are spaced apart by a distance very slightly in excess of the length of the shafts 89-90, so that said head 80 may slide therein under gentle friction.
  • the cranked levers 76-77 are each traversed by a shaft 97- 98 respectively, which are supported on the limbs 95-96.
  • the other end of the control lever 82 traverses the wall of a small case 99 fixed on the base 49 by the screw 100.
  • the rod 82 is articulated by a shaft 101 at the end of one of the arms of a cranked lever 102, mounted on a fixed shaft 103 and the other end of which is, through the intermediary of a shaft 104, articulated on the end of a rod 105 integral with the moving element of an electromagnet 106, said moving element being urged rearwardly by a spring 107.
  • the excitation circuit of this electromagnet 106 can be controlled by any appropriate means known per se, in turn controlled by the rotating equipment shown schematically at 8. As shown in FIGS. 10 and 11, this equipment is formed by a fixed photo-electric cell 108, an excitation lamp 109 also fixed and placed opposite said cell and opaque screens 10 carried by the moving equipment 8, all these parts being placed in suitable positions with regard to the cams or protuberances of the cam 43.
  • the Weft drawing devices move in the direction of the arrow F shown in FIGURE 3, so that the weft threads must be laid successively across the trajectory F by means of the jaws 66, 67 of the weft nipper.
  • the weft is presented to the nipper by a device diagrammatically indicated by the numeral 5 in FIGS, 2 and 10. This device does not constitute any part of the present invention and 18 described, for instance, in applicants above-mentioned patent application Ser. No. 579,079.
  • the operation of the described device is as follows: Initially, as shown in FIGURES 3 to 6, the arm 60 is located in the waiting position at the point where the appropriate weft thread is presented by the selector shown schematically at 5, the jaws 66-67 being in the open position, the screen being interposed between the photo-electric cell 108 and the corresponding lamp 109, but in the position just preceding the unmasking phase, and a cam or protuberance 43 being located in a position preceding, by a small distance, the release of the roller 41 of the means for moving the arm 60.
  • the electro-rnagnet 106 is always inactive and, by the action of the return spring 107, the rod 105 is always urged downwardly, thus pushing back the rod 62 via the cranked lever 102, which brings about the separation of the free ends 74-75 of the cranked levers 76-77, and, consequently the open position of the jaws 66-67 of the weft nipper.
  • the screen 110 uncovers the cell 108; the cell 108 is then energized by the lamp 109 and it will close the switch 108a (FIG. 11) so that the excitation circuit of the electromagnet 106 closes immediately, which brings about the almost instant closing of the jaws 66-67 on the weft thread.
  • the rod 105 in its upward axial movement angularly displaces the cranked lever 102 about its shaft 103, whichcauses a retracting action of the rod 82.
  • the equipment is then positioned in the loom in such a way that the weft thread so moved is positioned across the trajectory of the weft-drawing device shown schematically at 6.
  • the cam 43 is so shaped that this end position of the move ment of said jaws 66-67 is maintained until the weftdrawing device 6 has drawn up a sufficient quantity of thread from the weft supply and through the selector 5 to form a pick.
  • the Weft nipper 18 brings the weft thread from the selector 5 into the path of the weft-drawing device 6.
  • the screen 110 is interposed again between a cell 108 and its exciting lamp 109, while a protuberance on the cam brings the roller 41 into the initial position, which also brings back the arm 60 with the jaws 66-67 into the initial waiting position.
  • the loom is so arranged that the weft thread can be cut off at the proper time.
  • the Weft is cut at the selector side after the weft-drawing device 6 has drawn a sufficient length of weft to lay a pick.
  • the cutoff end of the pick will be 'located at the exit side of the shed while the other end which has been held by the jaws 66, 67 is located at the other side, namely, the entry side of the shed.
  • this operation will be carried out by the selector, and at the moment when the jaws 66-67 are opened following the passage of a weft-drawing device.
  • weftdrawing devices in essentially variable forms, particularly by replacing the described means by any technically equivalent means or functional equivalent.
  • three such Weft-drawing devices are arranged equidistantly on the circular loom, comprising one selector per weft nipper and twelve weft-drawing devices, thereby providing a loom of very high performance.
  • a selector and weft-drawing devices movable along a trajectory, a weft nipper interposed between said selector and said weft-drawing devices and comprising a support having the shape of a cross-piece, an oscillating arm connected to said support and overhanging the trajectory of the weft-drawing devices, gripping means carried by an end of said arm, said gripping means being normally open, means angularly displacing said arm depending upon the movement of the Weft-drawing devices, and means temporarily closing said gripping means whereby weft yarn is gripped at said selector and drawn across the path of the weft drawing device.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Auxiliary Weaving Apparatuses, Weavers' Tools, And Shuttles (AREA)
  • Braking Arrangements (AREA)
US579080A 1965-09-17 1966-09-13 Weft nipper for circular looms Expired - Lifetime US3422858A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE669742 1965-09-17

Publications (1)

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US3422858A true US3422858A (en) 1969-01-21

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ID=3847931

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US579080A Expired - Lifetime US3422858A (en) 1965-09-17 1966-09-13 Weft nipper for circular looms

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US (1) US3422858A (en))
CH (1) CH463420A (en))
DE (1) DE1535585B1 (en))
ES (1) ES331328A1 (en))
GB (1) GB1160582A (en))
NL (1) NL6612949A (en))
NO (1) NO122787B (en))
SE (1) SE338023B (en))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3604467A (en) * 1968-05-30 1971-09-14 Peltzer & Fils Sa Weft nipper for circular loom
US3862648A (en) * 1973-06-05 1975-01-28 Vyzk Ustav Bavlnarsky Weft thread clamp and cutter for travelling-wave shedding looms

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB435061A (en) * 1933-05-06 1935-09-13 Cornelis Johannes Slot Improvements in or relating to looms with circulating weft inserters and stationary weft supply
GB644301A (en) * 1946-11-25 1950-10-11 Perre Georges Emile Auguste Va Sectional weaving loom
US2594398A (en) * 1949-10-31 1952-04-29 Henry J Cooper Selecting mechanism for color weft insertion
CH295628A (de) * 1950-03-15 1954-01-15 James Cooper Henry Vorrichtung zum Nachspeisen der sich in gleichbleibender Richtung im Kreise bewegenden Schiffchen eines Rundwebstuhls.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1024028B (de) * 1954-12-27 1958-02-06 Zangs Ag Maschf Schussfaden-Zubringervorrichtung fuer Rundwebmaschinen mit durchlaufenden Greiferschuetzen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB435061A (en) * 1933-05-06 1935-09-13 Cornelis Johannes Slot Improvements in or relating to looms with circulating weft inserters and stationary weft supply
GB644301A (en) * 1946-11-25 1950-10-11 Perre Georges Emile Auguste Va Sectional weaving loom
US2594398A (en) * 1949-10-31 1952-04-29 Henry J Cooper Selecting mechanism for color weft insertion
CH295628A (de) * 1950-03-15 1954-01-15 James Cooper Henry Vorrichtung zum Nachspeisen der sich in gleichbleibender Richtung im Kreise bewegenden Schiffchen eines Rundwebstuhls.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3604467A (en) * 1968-05-30 1971-09-14 Peltzer & Fils Sa Weft nipper for circular loom
US3862648A (en) * 1973-06-05 1975-01-28 Vyzk Ustav Bavlnarsky Weft thread clamp and cutter for travelling-wave shedding looms

Also Published As

Publication number Publication date
DE1535585B1 (de) 1970-06-04
NO122787B (en)) 1971-08-09
CH463420A (fr) 1968-09-30
NL6612949A (en)) 1967-03-20
GB1160582A (en) 1969-08-06
ES331328A1 (es) 1967-07-01
SE338023B (en)) 1971-08-23

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