US3315709A - Method of and device for feeding weft thread into the gripper of gripper looms - Google Patents

Method of and device for feeding weft thread into the gripper of gripper looms Download PDF

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Publication number
US3315709A
US3315709A US437506A US43750665A US3315709A US 3315709 A US3315709 A US 3315709A US 437506 A US437506 A US 437506A US 43750665 A US43750665 A US 43750665A US 3315709 A US3315709 A US 3315709A
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Prior art keywords
gripper
shuttle
weft thread
fabric
gripping mechanism
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Expired - Lifetime
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US437506A
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English (en)
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Svaty Vladimir
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Elitex Zavody Textilniho
Elitex
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Elitex Zavody Textilniho
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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 is concerned with a simple method and a device for feeding the weft thread end into a unilateral or bilateral gripper in gripper looms from a weft thread supply situated on one or on both sides of the shed, in order to catch the weft thread in the gripper and to transfer it into the shed.
  • a device for performing the first method is, above all, very complicated in its construction and therefore difficult to be produced, as the weft thread, getting to a place as near as possible to the fabric during the slay, must be gripped at this point at first by a special tongue device, then trimmed and at last transferred together with the whole tongue device by means of further complicated mechanisms into such a position that will assure its reliable feeding into the opened collet of the gripper mechanism.
  • a great disadvantage of the device for performing the second method is due to the fact that the weft thread enters the gripping mechanism of the gripper at the moment of the beginning of the weft insertion, i.e. at a time, in which its speed is at a maximum, so that only a very short time interval can be used for gripping the weft end, and for that reason this procedure cannot be checked and is, therefore, not fully guaranteed.
  • the present invention is based upon that the weft thread is gripped by the gripper in the position of the slay of the batten before it is trimmed from the fabric, whereby the connection between the weft supply and the fabric is interrupted, the whole feeding being performed by a simple lever with a guiding eye.
  • the actual weft feeding between the projection and the pressing spring of the gripper is made by the relative motion of said lever and said gripper, whereby for that feeding a rotary motion of the gripper through an angle of is used between the individual weft insertions, the weft thread being simultaneously wound around the projection of the gripper, this contributing to the reliability of gripping the Weft end in the gripper.
  • FIG. 1a diagrammatic view of the feeding device in front elevation at the moment of movement of the gripper into the shuttle box
  • FIG. 2a diagrammatic view of the gripper and the feeding lever at the moment of feeding weft into the pp FIGS. 3 to 6-diagra-mmatic views of the main working mechanisms in front elevation in the individual phases of feeding the weft into the gripper,
  • FIGS. 7 to 9 diagrammati-c views of the gripper, the batten and the fabric in the main work phases in plan view.
  • the shuttle boxes 3 are turned after each weft insertion by gripper 5 through an angle of 180, by which gripper 5 is brought into a new weft inserting position.
  • the shuttle boxes 3 and the gripper 5 perform a swinging motion together with batten 1, in the same way as in shuttle looms.
  • a simple feeding lever 11 is situated on each end of the machine on the pin 10, said lever being equipped with a guiding eyelet 12, through which passes the weft thread 13, which is drawn off a cross wound bobbin 14, which is also situated on the machine frame.
  • a cutting device 15 of commonly known type is arranged on pin 10, said cutting device being controlled in any commonly known, not shown way from a known control mechanism through tie rod 16.
  • each of said levers being equipped with a two-arm needle 20 for unthreading, said needle being pivotally mounted on pivot 21, and a spring 22 connected to one end of each needle tends to turn the latter in clockwise direction around said pivot 21.
  • the two-armed unthreading needle can act simultaneously as a weft stop motion, as its upper arm 23 can cooperate in the usual way with the contacts 24 and 25 of a known stop motion mechanism.
  • the shed is built in a usual way from a system of upper warp threads 26 and lower Warp threads 27, the fabric 28 being produced being tentered on its selvedges by a usual clip 29.
  • the weft thread 13, being drawn off the cross wound bobbin 14 is Ebraked by brake 30 of any known type.
  • the device according to the present invention works as follows:
  • Gripper 5 is inserted through the shed e.g. in a known, not shown fro-m the right side to the left, weft yarn 13' being drawn from the cross-wound bobbin 14' (FIG. 7),
  • weft thread I13 was drawn through the shed from the cross wound bobbin 14 on the left side, as can be seen in FIGS. 1 and 7, said weft thread 13 being trimmed on the right end and woven into the fabric 28 in full width, whereas its left end passes through the guiding eyelet 12 of the feeding lever 11 over brake 30 to the cross wound bobbin 14.
  • the two-armed unthreading needle 20, which can serve as weft stop motion, is situated in that working phase in front of weft thread 13' between the fabric 28 and the gripper 5.
  • batten 1 begins to move from its rear position into the front position, ie the beatgup position, in which reed 2 will push the inserted weft thread 13' to the fill of fabric 28 (FIG. 8); if weft 13 is correctly inserted during this movement, the part situated between fabric 8 and the gripping. of projection 7 and spring 8 of gripper 5, touches the longer bottom arm of the two armed unthreading needle 20, and begins to turn said needle, after batten 1 has moved into the beat-up position, around pin 21 against the pull of spring 22 in the counterclockwise direction, whereby the upper arm 23 is brought out of the possible contact with the contacts 24 and 25 of the stop motion mechanism.
  • FIG. 2 an embodiment by way of example is shown, in which gripper 5 is stationary during the feeding procedure, whereas the feeding lever 11 swings about pin in the direction of S whereby the weft thread 13, being hitherto held in fabric 28, is shifted behind projection 7 before the pushed-off spring 8.
  • this feeding can be performed by making use of the turning motion of gripper 5 through 180 in the rotatable shuttle box 3, this being an object of the Czechoslovak patent application No. 1,355/ 64; and of U.S.A. application Ser. No. 554,257 in that case, the feeding lever 11 remains stationary and feeding of the weft thread 13 )between projection 7 and pushed-off spring 8 is performed at the start of the rotary motion of gripper 5, as can be seen in FIG. 4. Simultaneously, with the beginning of the rotary motion of gripper 5, batten 1 begins to move from its beat-up position (FIG. 8) to its rear position (FIG. 9), so that in the following moment the feeding lever 11].
  • the trimming device 15 cuts off in a known way the woven in part of weft thread 13 on the fabric selvedge, as seen in FIG. 4, from a part of the gripper between spring 8 and projection 7 of gripper 5 and over the guiding eyelet 12 of feeding lever 11 leading towards brake 30 and cross-wound bobbin 14.
  • the gripper shuttle 5 In the position of the device as shown in FIG. 1 the gripper shuttle 5 has already carried the weft thread 13 through the shed and the batten 1 occupies the position short of the beatup position. Now, the batten 1 starts to move int-o the beat-up position, that is towards the feeding lever 11, and at the end of this motion the reed 2 beats up the weft thread 13' into the fell of the fabric.
  • the newly inserted weft thread 13 is sufficiently secured to the crossed warp threads, so that at the time at which the free end of the weft thread 13' is released from the nio between the projection 7 and the free end of the flat spring 8 of the gripper shutter 5, it cannot retract into the shed by the action of the tension on the yarn.
  • the cutter 15 severs the end of the weft thread 13 at a portion of the latter between the weft fabric selvedge, -as viewed in FIG. 1 and the guide eye 12 of the feeding lever 11.
  • this severing takes place only after the feeding lever has introduced a portion of the weft thread 13 located between the guide eye 12 of the lever 11 and the cutter, into the gripper shuttle 5, that is in the gripping mechanism of the latter formed by the projection 7 and the free end of the pre-tensioned flat spring 8.
  • the severed portion of the thread 13 which now forms the leading end of thenext weft thread to be inserted, is secured in the gripper shuttle 5, whereas the remaining portion of the previously inserted weft thread is securely held in the fabric 28.
  • FIG. 6 The initial phase of the insertion of gripper 5 into the new shed is shown in FIG. 6. From which can be seen, that during this insertion the weft thread 13 being inserted is wound around projection 7 of gripper 5, said winding increasing substantially the security of gripping the weft thread 13 in gripper -5, so that a gripper 5 and spring 8 of minimum dimensions and force may be used.
  • a weaving loom for weaving a fabric, in combination, support means; an elongated batten mounted on said support means movable between a rear position and a beat up position; a shuttle having a gripping mechanism at one end and adapted to be moved between opposite end positions at opposite selvedges of the fabric; a pair of turnable shuttle boxes respectively mounted on said batten in the regions of opposite ends of the latter and respectively adapted to receive said shuttle in the end positions thereof; a pair of weft thread supply bobbins; a pair of turnable guide lever means mounted on said support means for respectively guiding a portion of a weft-thread from the respective supply bobbin into the gripping mechanism of said shuttle when the latter is located in the respective shuttle box, each of said lever means being arranged in a position so as to open during the turning thereof in one direction said gripping mechanism and to introduce said portion of said weft thread into said opened gripping mechanism; means for moving said lever means in said one and in the opposite direction, said gripping mechanism closing when said lever means
  • said gripping mechanism includes a projection on said one end of said shuttle and a leaf spring fixed at one end thereof to said shuttle in the region of the other end of the latter and being biased so that the free end of said leaf spring is urged against said projection, whereby a weft thread may be gripped between said projection and said free end of said spring, said lever means engaging during turning thereof in said one direction said leaf spring so as to form a gap between said free end of said leaf spring and said projection into which said portion of said weft thread is introduced by said lever means.
  • lever means is turnable in a plane between a turning axis of the respective shuttle box and the selvedge facing the respective shuttle box so that during turning of the shuttle box after the weft thread portion has been gripped by the gripping mechanism of the shuttle located in the respective shuttle box, the gripped end of said weft thread will be wound about said projection.
  • said removing means includes a needle turnably mounted on said support means and located in a rest position to one side of a weft thread passing from one to the other side of the loom, and spring means biased to maintain said needle in said rest position, said needle being engaged and turned against the bias of said spring means and the tension of the latter increased when said Weft thread is beaten up by said batten, whereby said gripped end of said weft thread is pulled out by said needle from said gripping mechanism when the latter is opened as the tensioned spring means return said needle to said rest position.
  • a shuttle having a forward end and a trailing end and adapted to be moved between opposite end (positions on opposite sides of said fabric and having a gripping mechanism located in the region of said trailing end; a pair of turnable shuttle supports respectively mounted on opposite sides of said fabric, adapted to receive said shuttle in the respective end position thereof and each adapted for turning with a shuttle therein between a receiving position in which the shuttle is located in said turnable shuttle support with the gripping mechanism adjacent said fabric and a discharging position with the gripping mechanism remote said fabric; a pair of weft thread supply bobbins located on opposite sides of said fabric; guide means located each side of said fabric and associated with a respective one of said turnable shuttle supports for respectively guiding a portion of a Weft thread from the respective supply bobbin into the gripping mechanism of said shuttle When said shuttle is located in said associated turnable shuttle support with its gripping mechanism adjacent said fabric; and cutting means operating in conjunction with each of said guide means for cutting the thread

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US437506A 1964-03-10 1965-03-05 Method of and device for feeding weft thread into the gripper of gripper looms Expired - Lifetime US3315709A (en)

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CS136764 1964-03-10

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US3315709A true US3315709A (en) 1967-04-25

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US437506A Expired - Lifetime US3315709A (en) 1964-03-10 1965-03-05 Method of and device for feeding weft thread into the gripper of gripper looms

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US (1) US3315709A (de)
AT (1) AT264407B (de)
BE (1) BE660883A (de)
CH (1) CH432410A (de)
DE (1) DE1535397C3 (de)
GB (1) GB1103241A (de)
SE (1) SE316130B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3416572A (en) * 1965-12-30 1968-12-17 Giavini Guido Straight shuttleless looms
US3487436A (en) * 1968-03-18 1969-12-30 Vladimir Svaty Weft thread cutting arrangement
US3487860A (en) * 1967-01-26 1970-01-06 Elitex Zavody Textilniho Shuttle braking arrangement
DE4000856A1 (de) * 1990-01-13 1991-07-18 Dornier Gmbh Lindauer Schussseitig angeordnete fadenschneidevorrichtung einer luftwebmaschine
US20040154678A1 (en) * 2001-03-23 2004-08-12 Edgar Hofstetter Gripping collet for seam-weaving machines

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1564603A (en) * 1924-01-05 1925-12-08 Kumfy Kab Company Loom
US2152255A (en) * 1936-10-08 1939-03-28 Sulzer Ag Method and loom for weaving
DE677255C (de) * 1936-07-17 1939-06-22 Albert Danner Einrichtung zum Eintragen des Schussfadens mittels eines Greiferwebschuetzens
FR1249877A (fr) * 1959-11-18 1961-01-06 Perfectionnements aux métiers à tisser à réserve de trame fixe
US3144884A (en) * 1960-09-24 1964-08-18 Sdruzeni Podniku Textilniho St Clamping shuttle
US3163184A (en) * 1961-02-10 1964-12-29 Cherpin Jean Victor Gripper shuttle

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1564603A (en) * 1924-01-05 1925-12-08 Kumfy Kab Company Loom
DE677255C (de) * 1936-07-17 1939-06-22 Albert Danner Einrichtung zum Eintragen des Schussfadens mittels eines Greiferwebschuetzens
US2152255A (en) * 1936-10-08 1939-03-28 Sulzer Ag Method and loom for weaving
FR1249877A (fr) * 1959-11-18 1961-01-06 Perfectionnements aux métiers à tisser à réserve de trame fixe
US3144884A (en) * 1960-09-24 1964-08-18 Sdruzeni Podniku Textilniho St Clamping shuttle
US3163184A (en) * 1961-02-10 1964-12-29 Cherpin Jean Victor Gripper shuttle

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3416572A (en) * 1965-12-30 1968-12-17 Giavini Guido Straight shuttleless looms
US3487860A (en) * 1967-01-26 1970-01-06 Elitex Zavody Textilniho Shuttle braking arrangement
US3487436A (en) * 1968-03-18 1969-12-30 Vladimir Svaty Weft thread cutting arrangement
DE4000856A1 (de) * 1990-01-13 1991-07-18 Dornier Gmbh Lindauer Schussseitig angeordnete fadenschneidevorrichtung einer luftwebmaschine
US20040154678A1 (en) * 2001-03-23 2004-08-12 Edgar Hofstetter Gripping collet for seam-weaving machines
US6948531B2 (en) * 2001-03-23 2005-09-27 Wangner Finckh Gmbh & Co. Kg Gripping collet for seam-weaving machines

Also Published As

Publication number Publication date
DE1535397A1 (de) 1970-09-24
BE660883A (de) 1965-07-01
CH432410A (de) 1967-03-15
AT264407B (de) 1968-08-26
SE316130B (de) 1969-10-13
DE1535397B2 (de) 1973-05-24
GB1103241A (en) 1968-02-14
DE1535397C3 (de) 1973-12-13

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