US3705503A - Apparatus for forming a system of weft threads for further processing in textile machines - Google Patents

Apparatus for forming a system of weft threads for further processing in textile machines Download PDF

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Publication number
US3705503A
US3705503A US150076A US3705503DA US3705503A US 3705503 A US3705503 A US 3705503A US 150076 A US150076 A US 150076A US 3705503D A US3705503D A US 3705503DA US 3705503 A US3705503 A US 3705503A
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Prior art keywords
transfer
grippers
conveyor
weft threads
movable
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US150076A
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English (en)
Inventor
Josef Skopalik
Vladimir Svoboda
Vaclav Opatril
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Elitex Zavody Textilniho
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Elitex Zavody Textilniho
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B23/00—Flat warp knitting machines
    • D04B23/12—Flat warp knitting machines with provision for incorporating unlooped wefts extending from selvedge to selvedge

Definitions

  • ABSTRACT Apparatus for forming a system of weft threads for further processing in textile machines as e.g. stitch knitting machines,' warp knitting machines and Raschel machines to the operating mechanisms of which there are fed mutually parallel weft threads.
  • the apparatus includes two continuously and uniformly moving weft thread conveyors which are vertically movable with respect to each other; a first one of such conveyors conveys the weft threads in a longitudinal direction to the operation point of the textile machine, and the second conveys the weft threads transversely from the thread supply onto the said first conveyor.
  • the first longitudinal conveyor is provided with grippers with movable gripping jaws;
  • the second transverse conveyor is provided with at least three transfer battens carrying transfer grippers which are provided with at least three stationary means which come into direct contact with the weft thread and at least one means mounted for movement with respect thereto.
  • the present invention relates to an apparatus for forming a system of weft threads for further processing in textile machines, as for example in stitch knitting machines, warp knitting machines, Raschel knitting machines, to the operating mechanisms of which are fed mutually parallelly arranged weft threads.
  • a device for constituting an approximately parallel system of weft threads, such device using helical links which receive loops of several continuous weft threadsat both sides of the machine and conveying said threads in continuous state to the operating point of the textile machine.
  • the disadvantage of the said device is the necessity of continuously extending the weft thread loops from the gripping of the loop until its knitting-in into the product. Thereupon, said weft threads are exposed to a long-lasting and steadily increasing load; this makes necessary a relatively slow operation of the machine in order to prevent frequent thread breakages. Moreover, since it is necessary to. use only high quality weft material, use of this device is economically'very disadvantageous.
  • Another known device includes a guide which successively lays the weft thread directly at the operating point ofv the knitting machine by a traversing motion from one side of the machine to the other in such manner that the guide performs one cycle during two revolutions of the working mechanism of the machine.
  • a further known device uses a reversely moving carriage which lays a system of weft threads into a continuously moving conveyor.
  • the system of weft threads thus constituted comprises weft threads which are not all mutually parallel, the said weft threads closing mutually small acute angles.
  • Still another device for laying mutually parallel weft threads into a(first) continuously moving conveyor.
  • the said weft laying is performed by a further (second) chain conveyor which is arranged obliquely with respect to the first conveyor, the weft threads being thus unwound from bobbins mounted on said second conveyor, and the weft thread ends being gripped on one side of the first conveyor.
  • the two conveyors move continuously at constant speeds, being synchronized in such manner that the weft thread withdrawn from the bobbin on the second conveyor is perpendicular to the direction of movement of the first conveyor between the fastening at the first conveyor and the guiding eyelet at the bobbin on the second conveyor, and mutually parallel to all other already laid weft threads.
  • the fastening of weft threads on both sides of the first conveyor is performed by gripping in grippers which are opened for gripping the thread by means of a cam which moves one part of the gripper away from the other.
  • the gripping of the weft thread on one side permits the use of a sucking device, while the thread is brought on the other side of said conveyor by another conveyor; After the weft thread is gripped by said grippers, it is cut off.
  • the disadvantage of the said device is the little chance of improving its efliciency, which is measured by the number of threads conveyed to the working point of e.g. a stitch knitting machine within a given time unit. Even when several threads are laid simultaneously in the said device, their number isconsiderably limited, particularly by the required width of the weft thread system to be constituted.
  • the velocity of laying threads onto the first conveyor is limited by the velocity and the reliability of gripping .the threads by the grippers, as well as the operation of the sucking device, which enable said gripping operation to be performed.
  • One of the newest known devices comprises two chain conveyors, the directions of movement of which are mutually normal.
  • the first conveyor transports a system of parallelly arranged weft threads to the operating point of the knitting machine, whereas the other, second conveyor prepares the weft threads to be laid into the first conveyor.
  • the movement of both conveyors is uniform and continuous and in both conveyors the weft threads are arranged mutually parallelly.
  • the said device is, also" known in two somewhat different embodiments.
  • the first conveyor is provided on one side with carrying grippers and on the other side with carrying fingers.
  • the other, second conveyor is provided with two transferring battens which are provided with transferring fingers.
  • a creel is arranged, with a system of retaining grippers attached thereto, said gripper system being stationary relative to said creel.
  • the weft threads are guided from the creel intosaid retaining grippers, the jaws of which are released upon the taking over of the loops of weft threads by the carrying fingers at the opposite side of the first conveyor upon the simultaneous gripping of the threads into the carrying grippers at the side located nearer to the creel of the first conveyor.
  • the system of weft threads for further processing, particularly in knitting machines, is constituted by groups which are simultaneously laid onto the first conveyor.
  • this device is not provided with retaining grippers,-said transferring battens of the second conveyor being provided with transferring grippers, the opening of their jaws being controlled by a cam surface at those moments at which said grippers pass above one or the other side of the conveyor.
  • the manners of operation of the two said embodiments are very similar, the second embodiment permitting more patterning than the first embodiment.
  • the disadvantages of the two embodiments of the said device consist in the relatively high intricacy of the separate parts of the device, thus reducing the reliability of operation and the economic advantages of the said device.
  • the present invention has among its objects reducing as much as possible the disadvantages of the known devices, and in providing a device for the preparation of a system of parallel weft threads for further 7 processing, particularly in warp knitting machines, consisting of relatively simple and easily manufactured, reliably operating mechanisms.
  • FIG. 1 is a diagrammatic view in plan of the device according to the present invention
  • FIG. 2 is a diagrammatic view in side elevation of the device according to the present invention.
  • FIG. 3 is a view in end elevation of the device according to the present invention, the view being taken in the direction A as shown in FIG. 2;
  • FIG. 4 is an overall view in perspective of the main operative part of the device according to the present invention.
  • FIG. 5 is a view in section taken along line 5-5 as shown in FIG. 1;
  • FIG. 6 is a front view of the transferring gripper in its opened position
  • FIG. 7 is a front view of the transferring gripper in its closed position
  • FIG. 8 is a side view of the transferring gripper in partial section
  • FIG. 9 is an end view of the transferring gripper in the direction C as shown in FIG. 7;
  • FIG. 10 is a view in perspective of a carrying gripper including its fastening on the chain of the longitudinal conveyor.
  • FIG. 11 is a diagram of the opening operation of the carrying grippers at the point of releasing of the weft threads carried thereby after their knitting-in.
  • the device according to the present invention includes an endless longitudinal conveyor 1', which is constituted by two laterally spaced, parallel endless double chains 2, 3, said chains being guided by means of guiding wheels 4, 5, 6 and driving wheels 7.
  • the drive for the whole device according to the present invention is derived from the drive of the knitting machine, advantageously by coupling said drive with the driving means of the knitting machine for withdrawing the product therefrom; in order to guarantee the feeding of the required number of weft threads to a given length of the product.
  • the chains 2, 3 of conveyor 1 introduce the weft thread 8 (FIG. 4) between the closing comb 9 and the knocking-over comb 10 of the knitting machine, or stitch knitting machine, respectively, which is provided with a system of knitting needles 11.
  • carrying means are arranged on the chains 2, 3, for example, a system of carrying grippers 12 (FIG. 10).
  • the carrying gripper 12 consists of a frame 13, in which, beside other things, two movable gripping jaws 14 are mounted for fastening the weft threads; in the conveying phase of the wefts to the operation point of the knitting machine two independent weft threads 8 are gripped by each gripper 12 (FIG. 4) as shown in FIG. 10, each gripper 12 is provided with two movable jaws 14 and a compression spring 15, which bears, through a washer 16, against a pin 17 which is mounted stationarily in a guiding rod 18 and is guided with one of its ends in a vertical groove 19 in frame 13. the said pin 17 prevents any turning of the movable jaw 14 while permitting it to move up and down.
  • the two double chains 2 and 3 are provided with L-shaped lugs 20, to which the separate carrying grippers 12 are fixed.
  • FIG. 5 only one side of the conveyor 1 with chain 2 is shown; the other side, including control, is arranged as a mirror image thereof.
  • the two double chains 2 and 3 are guided in respective guideways 21 (FIGS. 4 and 5), the two halves of each such guideway being connected by means of a screw 22.
  • Each guideway 21 is fixedly connected to a horizontal carrier beam 23, the two beams 23 being parallel and vertically reciprocated in synchronism and in phase as indicated by the arrow D in FIG. 5.
  • Each beam 23 is provided with at least one forked bracket with a roller, in the exemplary embodiment with two forked brackets 24 and a roller 25 at each bracket.
  • Each roller 25 rolls over a cam 26; the two earns 26 shown are connected to rotate in synchronism and in phase, and lift the whole specified mechanism including the carrying grippers 12 in the direction D into a position, at which the weft threads 8 are deposited into grippers 12.
  • the device according to the present invention is provided with a cam 27.
  • Cams 26 and 27 are driven by means of transmissions by the driving mechanism of the knitting machine.
  • FIG. 2 such cams are shown diagrammatically as being drivingly connected by sprockets and chains.
  • the said cam 27 acts during its turning upon roller 28, from which the motion is transferred over holder 29 to the lifting batten 30 (FIG. 4).
  • the lifting batten in the direction D (FIG. 5)
  • the lower end of the guiding rod 18 of the movable jaw 14 is engaged by the batten 30 thereby to release said jaw 14, thereby to permit the laying of the weft 8 between the head 31 of jaw 14 and the upper member of frame 13.
  • each end of carrier beam 23 is provided with a guiding part which engages a respective guideway 32 affixed to frame 33 in the exemplary embodiment.
  • the said arrangement permits the simultaneous control of a plurality of carrying grippers 12, advantageously several dozens of them.
  • the laying of the weft threads 8 is performed by a transverse conveyor 34 (FIGS. 1-4, inclusive), which consists substantially of two parallel synchronously driven double chains 35 and 36, to corresponding opposite links of which there are fixedly connected at least three transferring battens 37.
  • a transverse conveyor 34 (FIGS. 1-4, inclusive)
  • the double chains 35 and 36 are guided over pairs of guiding wheels, each of the two chains passing over three guiding wheels 38, one of which wheels is driven by a transmission to be described below. All wheels 38 are rotatably mounted in frame 39 with a stand 40, frame 39, 40 being fixedly connected to frame 33.
  • Each batten 37 is provided with a system of transferring grippers 41 (FIGS. 6-9, inclusive), the number of which on one side of the batten corresponds to the number of weft threads 8' which are laid into the longitudinal conveyor 1.
  • Each transferring gripper 41 consists of a stationary jaw 42' and a movable jaw 44.
  • the stationary jaw 42 simultaneously constitutes the frame of the gripper and the stationary part of a knife.
  • Gripper 41 is also fixedly fastened to batten 37 by means of said jaw 42.
  • the movable jaw 44 is arranged on a pin screw 43 pivotally in the form of a two-armed lever.
  • the sinkers 45, '46 are stationary and are mounted on one hand on a pin screw 43, and on the other hand on the pin 47, which is mounted stationarily in a firm jaw, advantageously by being pressed in.
  • the sinkers 45, 46 are made advantageou'sly of elastic metallic material.
  • the movable jaw 44 is also mounted on pin 47; however, this mounting enables the said movable jaw 44 to perform a rotary motion about the axis of the pin screw 43 by providing said movable jaw 44 with an arcuate slot which is not visible in the accompanying drawings.
  • a control batten 50 is attached to each transfer batten 37.
  • the movable jaw 44 of all transferring grippers 41 is provided with a pin 48 said pins 48 of grippers 41 mounted on one batten 37 being located in the openings 49 of one control batten 50 (FIG. 4).
  • adjustable stops 67, 68 By means of adjustable stops 67, 68 (FIG. 4) the position of the control battens 50 is changedat predetermined points.
  • the movable jaws 41 of the transfer grippers 41 are opened,
  • the operative part of the movable jaw 44 of each transferring gripper 41 is shaped at its end in the form of letter U (FIG. 6), thus forming two contact surfaces for contacting two sinkers 45, 46 when gripper41 is closed.
  • U-shaped part In the U-shaped part a recess 51 is made, which is engaged by weft thread 8 being tensioned between the fastening gripper and a thread brake (not shown) attached to each of the bobbins 52 at the creel.
  • the sinkers 45, 46 arearranged on the transfer gripper 41 in such manner that they are located, in comparison with the blade of the stationary jaw 42, nearer to the blade 54 of the opened movable jaw 44.
  • each weft thread 8 is laid, by synchronizing the motions of the transfer grippers 41, the carrying grippers 12 and the opening of the movable jaws 14, between the head 31 and frame 13 of grippers 12. Said weft thread, thus gripped, is carried to the operation point of the knitting machine.
  • the output shaft 62 of worm gearing 61 is provided with driving wheels 7 for driving the longitudinal conveyor 1.
  • the cam 26 is provided with a segment (FIG. 5) fixedly connected thereto, said segment preventing by the mutual action with a roller 56 rotatable on a pin affixed to bracket 24 the undesired lifting of the carrying grippers 12.
  • Grippers 12 may be lifted only upon a certain turning of the cam by providing segment 55 with a recess (not shown).
  • the drive of the device according to the present in- 'vention is derived, in the exemplary embodiment, from the mechanism for withdrawing the product from the textile machine.
  • Such drive is shown in FIG. 2 as including a drive wheel 57, from which motion is trans- From the continuous shaft 60, the drive is also transferred by sprockets and a chain to a worm box 63 (FIG. 2) controlling cam 27 for opening the jaws 14 of grippers 12.
  • the two further earns 26 for controlling the strokes of the carrying grippers 12, are driven from the worm box 63.
  • the output shaft 64 of worm box 63 drives the same mechanisms, that is, earns 26 and 27 at the opposite side of the device according to the present invention.
  • the drive is also transferred to the control box 65,'which is arranged on the driving shaft 66 of the transverse conveyor 34.
  • the control box 65 drives by means of a known system of gear transmissions (not shown) the transverse conveyor 34 at a continuously momentarily changing velocity while maintaining a constant average speed. The said momentary velocity is at its minimum when the conveyor 34 is laying weft threads 8 into the carrying grippers 12.
  • the device according to the present invention operates as follows:
  • the system of several dozens of weft threads 8 is transferred by the system of transfer grippers 41 over the whole width of the longitudinal conveyor 1.
  • the transfer of weft threads is performed vertically, as the two conveyors, i.e. the longitudinal conveyor 1 and the transverse conveyor 34 move vertically with respect to one another.
  • the movable jaws 14 of the carrying grippers 12 are opened at first, whereupon the whole system for carrying grippers 12 is lifted.
  • the number of grippers 12 corresponds to onehalf of the transferred weft threads 8, since each gripper 12 can transfer two weft threads.
  • the weft threads are slipped, after lifting grippers 12 at chain 2 and releasing their jaws 14, between the head 31 of the movable jaws 14 and the frame 13 of the carrying gripper.
  • the weft threads a are gripped.
  • the whole system of simultaneously transferred weft threads is deposited, after finishing the said operation, on the longitudinal conveyor 1.
  • the said opening and re-closing of the movable jaws 44 is performed, on one hand, at the end of the inserting motion of the transverse conveyor 34, in which the weft threads are released for clamping in the transfer grippers 41, and on the other hand, approximately simultaneously at the beginning of the inserting motion, at which each weft 8 is gripped, between a brake (not shown) for the weft threads 8 and the carrying gripper 12 mounted on chain 2, into a transfer gripper 41, said weft thread 8 being out between the blade 53 of the stationary jaw 42 and the blade 54 of the movable jaw 44 by a single motion of the movable jaws 44 upon finishing the gripping of weft thread 8.
  • each weft thread 8 is gripped at two points, each time between one of the sinkers 45, 46 and the operative part of the movable jaw 44 of gripper 41.
  • the weft thread 8 is separated from the weft supply 7, said weft thread being laid on the longitudinal conveyor 1.
  • the specified operations at the beginning and the end of the transfer motion of the transverse conveyor 34 are always performed by the transfer grippers 41, mounted on two following transfer battens 37, while the third transfer batten is conveyed back to the beginning of the transfer operation (FIG. 1).
  • the weft threads 8 withdrawn from bobbins 52 are tensioned between a brake (not shown) and transfer grippers 41, grippers 41 carrying weft threads 8 into the carrying grippers 12.
  • the gripping into the transfer gripper 41 of a further transfer batten 34 follows immediately thereafter.
  • the longitudinal conveyor 1 feeds the weft threads 8 arranged parallelly thereon to the operation point of the knitting machine at which said weft threads are knitted into each course of the knitwork by one weft thread 8 into each course in a known manner.
  • the releasing of the weft thread 8 from the carrying gripper 12 at the operation point of the machine can be performed e.g. by means of a cam segment 69 (FiG. 11), the movable jaws 14 being opened by the action of cam 69 upon the guiding rod 18 of the respective grippers 12.
  • said device including two continuously and uniformly moving weft thread conveyors which are movable vertically with respect to each other, a first one of said conveyors carrying the weft threads in a longitudinal direction to the operation point of the textile machine and the other, second conveyors carrying the weft threads transversely from the supply onto the first said conveyor, the improvement which comprises carrying grippers on the first conv or, said i ers havin movable selectivel o erab g gripping jz ss, at least three longitudinally? spewed transfer battens on the second conveyor, and transfer grippers on the transfer battens.
  • each of the transfer grippers is provided with at least three stationary means which come into direct contact with the weft thread, and at least one rotatably mounted means.
  • the stationary means of the transfer gripper are constituted by a stationary jaw provided with a cutting edge and two stationary sinkers, the said cutting edge as well as the two said sinkers being in contact upon closing of the transfer gripper with the operative part of the movable jaw of the transfer gripper.
  • Apparatus as claimed in claim 5 comprising spaced cams disposed along the second conveyor for operating the control battens to close and open the transfer grippers, respectively.
  • Apparatus as claimed in claim 1 comprising guiding parts for the movable jaws of the carrying grippers provided with a transverse pin, said transverse pin engaging a longitudinally extending slot in the frame of the carrying gripper, whereby to prevent the movable jaw from turning.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
  • Looms (AREA)
US150076A 1970-07-02 1971-06-04 Apparatus for forming a system of weft threads for further processing in textile machines Expired - Lifetime US3705503A (en)

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CS460570 1970-07-02

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CH (1) CH522064A (enExample)
DE (1) DE2124516A1 (enExample)
FR (1) FR2097147B1 (enExample)
GB (1) GB1312859A (enExample)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906749A (en) * 1972-12-27 1975-09-23 Schlafhorst Co Maschf Weft storage device for warp knitting machines
US3910072A (en) * 1972-04-26 1975-10-07 Elitex Zavody Textilniho Method of, and apparatus for, making stitch-bonded fabric
US3921417A (en) * 1971-03-26 1975-11-25 Karl Kohl Apparatus for conveying filling threads to a warp knitting machine
US4123920A (en) * 1977-08-31 1978-11-07 Bassist Rudolf G Apparatus for feeding filling threads to a warp knitting machine
US4372132A (en) * 1980-12-08 1983-02-08 Bassist Rudolf G Apparatus for feeding filling threads to a wrap knitting machine
US4442684A (en) * 1981-07-16 1984-04-17 Karl Mayer Textilmaschinenfabrik Gmbh Control of weft thread insertion
US4638647A (en) * 1985-03-04 1987-01-27 Veb Kombinat Textima Method and flat warp-knitting machine for the production of a weft-and-warp-knit fabric
US4823564A (en) * 1987-09-02 1989-04-25 Liba Maschinenfabrik Gmbh Device for clamping weft threads in a warp knitting machine
EP2028306A1 (de) * 2007-08-23 2009-02-25 Liba Maschinenfabrik GmbH Doppelbarren-Raschelmaschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3364701A (en) * 1966-02-25 1968-01-23 Stevens & Co Inc J P Apparatus for feeding filling threads to a warp knitting machine
US3446038A (en) * 1967-06-16 1969-05-27 Toshiaki Inui Weft inserting method and apparatus
DE1919988A1 (de) * 1968-04-22 1969-11-06 Elitex Zd Y Textilniho Strojir Flaechentextil- oder anderes Flaechengebilde,dessen Herstellungsverfahren auf Textilmaschinen,z.B. Durchwirkmaschinen,Kettenstuehlen,Raschel- und anderen Maschinen,einschliesslich einer Vorrichtung zur Durchfuehrung dieses Verfahrens
GB1182580A (en) * 1967-08-02 1970-02-25 Elitex Zavody Textilniho Device for Forming a Movable Weft Yarn System, Suitable for Further Processing in Textile Machines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3364701A (en) * 1966-02-25 1968-01-23 Stevens & Co Inc J P Apparatus for feeding filling threads to a warp knitting machine
US3446038A (en) * 1967-06-16 1969-05-27 Toshiaki Inui Weft inserting method and apparatus
GB1182580A (en) * 1967-08-02 1970-02-25 Elitex Zavody Textilniho Device for Forming a Movable Weft Yarn System, Suitable for Further Processing in Textile Machines
DE1919988A1 (de) * 1968-04-22 1969-11-06 Elitex Zd Y Textilniho Strojir Flaechentextil- oder anderes Flaechengebilde,dessen Herstellungsverfahren auf Textilmaschinen,z.B. Durchwirkmaschinen,Kettenstuehlen,Raschel- und anderen Maschinen,einschliesslich einer Vorrichtung zur Durchfuehrung dieses Verfahrens

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3921417A (en) * 1971-03-26 1975-11-25 Karl Kohl Apparatus for conveying filling threads to a warp knitting machine
US3910072A (en) * 1972-04-26 1975-10-07 Elitex Zavody Textilniho Method of, and apparatus for, making stitch-bonded fabric
US3906749A (en) * 1972-12-27 1975-09-23 Schlafhorst Co Maschf Weft storage device for warp knitting machines
US4123920A (en) * 1977-08-31 1978-11-07 Bassist Rudolf G Apparatus for feeding filling threads to a warp knitting machine
US4372132A (en) * 1980-12-08 1983-02-08 Bassist Rudolf G Apparatus for feeding filling threads to a wrap knitting machine
US4442684A (en) * 1981-07-16 1984-04-17 Karl Mayer Textilmaschinenfabrik Gmbh Control of weft thread insertion
US4638647A (en) * 1985-03-04 1987-01-27 Veb Kombinat Textima Method and flat warp-knitting machine for the production of a weft-and-warp-knit fabric
US4823564A (en) * 1987-09-02 1989-04-25 Liba Maschinenfabrik Gmbh Device for clamping weft threads in a warp knitting machine
EP2028306A1 (de) * 2007-08-23 2009-02-25 Liba Maschinenfabrik GmbH Doppelbarren-Raschelmaschine
CN101525808B (zh) * 2007-08-23 2011-08-24 利巴机械制造有限公司 双针床拉舍尔式经编机

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Publication number Publication date
CH522064A (de) 1972-04-30
GB1312859A (en) 1973-04-11
FR2097147A1 (enExample) 1972-03-03
DE2124516A1 (de) 1972-01-05
FR2097147B1 (enExample) 1973-12-07

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