US3906749A - Weft storage device for warp knitting machines - Google Patents

Weft storage device for warp knitting machines Download PDF

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Publication number
US3906749A
US3906749A US428232A US42823273A US3906749A US 3906749 A US3906749 A US 3906749A US 428232 A US428232 A US 428232A US 42823273 A US42823273 A US 42823273A US 3906749 A US3906749 A US 3906749A
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Prior art keywords
holding members
weft
storage device
members
knitting
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Expired - Lifetime
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US428232A
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English (en)
Inventor
Gunter Frehn
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Oerlikon Textile GmbH and Co KG
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W Schlafhorst AG and Co
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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 Well storage device for warp knitting machine having knitting needles at a given location for knitting weft and warp threads into a fabric web.
  • a first and a second group oi holding members spaced from one another at locations at which they are respectively adjacent opposite edges oi a fabric web that is being knitted in the machine.
  • the holding members being loopable thereabout by welt threads and being rotatably mounted and revolvable in direction toward the knitting needles; and rotary drive means for the holding members.
  • the invention relates to a weft thread storage device for warp knitting machines and. more particularly. to such a device having holding members oppositely disposed on both sides of the edges of a fabric web being knitted in the warp knitting machine. the holding members being rotatably mounted and revoivingin direction toward the knitting needles of the machine. and about which weft threads are looped.
  • Weft thread storage devices of this general type continuously accept lengths of welt thread drawn out in the form of loops. which are. for example. unwound from a stationary supply reel.
  • the weft thread storage device feeds the lengths of weft thread to the knitting tools which attend to the continuous intermeshing of the weft threads with the fabric.
  • a device for this purpose. wherein the rotatably supported holding members over which the weft threads are looped are constructed in the form of rolls which are supposed to effect a reduction in the large frictional stress of the weft thread material. This is also to apply particularly when several threads rubbing against each other are to be inserted or fed. Through the introduction of the rolls. the use of a lubricant which reduces the coefficient of friction of the thread is furthermore supposed to be rendered unnecessary.
  • weft storage device for a warp knitting machine having knitting needles at a given location for knitting weft and warp threads into a fabric web.
  • the holding members being loopable thereabout by weft threads and being rotatably mounted and revolvable in direction toward the knitholding members. whereby, depending upon the peripheral speed and the nature of the surface of the hold ing members. a tensile force is exerted on that strand of the weft thread which becomes slack when the weft thread is transferred to the knitting tools.
  • the rotary drive means comprise a plurality of pressure members frictlonally engaged with the holding members. Such pressure members can abut the periphery of the holding members. clamp or grip the weft thread looped around the latter, and be driven in such a manner that the tensile force acting on the weft thread is reinforced to any extent desired. and. in fact. freed loop sections are stored.
  • the rotary drive means comprise a plurality of stationary pressure members associated with the revoivin g holding members.
  • the rotary drive means having stationary pressure members assures. in a particularly simple, operationally reliable and economically favorable manner. that the individual holding members roll on the stationary pressure members in the direction toward the knitting tools completely synchronously with a continuous or even stepwise motion of the rotatably mounted holding members. and specifically, as with the rotary drives hereinbefore described. in direction toward the knitting tools against the feeding movement of all the holding members that are mounted on a disc. a chain drive or the like. Since there is looped around one or more holding members. a length of thread of the weft between each holding member and the pressure members. the length of thread. which is released when a weft thread loop slides off the holding member, is transported back against the direction of withdrawal of the weft thread or threads.
  • the thread of a weft thread loop is reliably shortened to the absolutely necessary length. Since the lholding members on the one side of the knitted web are furthermore forced to rotate in opposite direction to those on the other side of the knitted web. a length of thread consumed on theone side of the edge of the fabric web of material is returned to the same extent by the opposite holding members. The result thereof is that a bunch of threads located in the weft thread storage device is always maintained in stretched condition. Also. in the case of a break in a weft thread. the pressure members prevent uncontrolled unwinding of slack sections of the weft thread from the weft thread storage device.
  • resiliently and temporarily liftable pressure members mounted on the stationary pressure members.
  • the pressure members are formed of elastic material.
  • FIG. I is a side elevational view of one of the discs at ofa weft storage device according to the invention that are disposed on both sides of the edge of a web of goods, and including various other essential parts;
  • FIG. 2 is a fragmentary view of FIG. 1;
  • FIG. 3 is a cross-sectional view of FIG. 1 taken along the line llI--III in direction of the arrows;
  • FIG. 4 ' is a top plan view, rotated clockwise through 90, of the weft thread storage device of FIG. I', and
  • FIG. 5 is a perspective view of the weft thread storage device with feeding members for the weft threads.
  • FIG. 1 there is shown, in front of a weft thread storage device I constructed in accordance with the invention, the knitting tools of a Raschel or warp knitting machine, including part of a casting-off or knocking-over bar 2, a latch needle 3, eye needles 4 and a comb 5.
  • Warp threads 6 are passed through the eye needles 4, and part of a finished web of material 7 is located adjacent the knocking-over bar 2.
  • the weft thread storage device 1, which is of circular construction in the illustrated embodiment, has two discs 8 disposed opposite each other in the vicinity of the edges of the web of material 7. Like its non-illustrated counterpart, the disc 8 is firmly connected to a driving shaft 9.
  • the weft thread storage device I rotates toward the knitting tools 2-8 in the direction of the arrow I0 in synchronism with the knitting speed during the operation of the machine, so that the weft threads, which are held and separated by the holding members II and 18, can be transferred continuously to the knitting tools by the comb 5, which oscillates back and forth in a conventional manner, so as to be intermeshed. with warp threads.
  • FIG. 2 shows another phase of this operation particularly clearly in a fragment of FIG. 1.
  • the pressure member 12 is a stationary pressure member, which is held in position by two stay bolts 13; the latter. in turn, being securable to a nonillustrated stationary part of the machine frame.
  • additional pressure members 15 which are mounted so that they can be raised and which normally also abut againstthe 3 11, shown partly in cross section, is in contact with a holding members II and 18 by the action of the torsion liftable pressure member 15.
  • the shortened base 21 of the holding members II can pass the shoulder 19 of the liftable pressure members IS unimpeded. This is also the case for the similar shoulders on the stationary pressure member 12.
  • Only an elongated or lengthened base 28 of the holding members 18 is thus in a position to lift a movable pressure member 15.
  • This lifting or raising action permits equallziation of the tension and the length of the weft threads F should differences in the speeds of the individual holding members oeettr.
  • All of the holding members II and II are relatively easily rotatable on pins 20 that are press-titted into the discs 8, as illustrated by the holding member II shown in FIG. 3. it is further apparent from FIG. 3 that the pressure member 15 is lined with a segment 15' formed of elastic material.
  • the stationary pressure members 12 are similarly lined.
  • the elastic material segments 15' ensure gentle treatment of the weft threads F and simultaneously afford a reliable drive of the holding members 11 and 18.
  • the pressure members I2 and 15 can, of course, also be formed completely of a dimensionally stable but nevertheless elastic material.
  • FIG. 3 as well as in FIG. I, there are shown particularly clearly several spacers 36, which are affixed to the inside of the discs Band which ensure the requisite pitch separation for the threads, even when the diameter of the holding member is relatively small.
  • the number and distribution of the spacers 36 on the periphery of each disc 8 depend upon the number of weft threads that are to be fed in or inserted simultaneously.
  • FIG. 4 there is shown how a weft thread bunch, formed of four different weft threads 22, 23, 24 and 25, is placed continuously and in loop-fashion around the holding members 11 and 18. It is clearly apparent from FIG. I that each of the weft threads 22 to 25 is looped around four holding members and must thereby form a weft thread loop of corresponding size.
  • FIG. 4 shows how the Individual threads of such a thread bunch are altematlngly transported back as soon as they, with the holding members If and I8, come into the vicinity of the pressure members 15 and 12.
  • the illustration in FIG. 4 seeks to clarify how the excess weft thread length in the vicinity of the weft thread loops is re moved, so that the closed loops 29 remaining at the selvage of the material do not overhang but exhibit the normal size otherwise attainable only in woven goods.
  • FIGS. 1, 2 and 4 there can further be seen a holddown device 30 which is swingable out above the weft threads F and which ensures correct positioning of the weft threads up to the direct transfer from the holding devices to the comb 5.
  • the hold-down device 30 is a bent-away part of a bell crank or double-arm lever 35 which is pivotable about the axis of the drive shaft 9.
  • the swinging or pivoting motion of the hold-down device 30 is produced in synchronism with the knitting speed by a cam 32, against which a roller 31 abuts under the biasing action of a tension spring 34 suspended at one end from an extension arm 33 and affixed to the machine frame at the other end thereof.
  • FIG. 5 there are shown, in addition to the parts of the weft thread storage device I according to the invention, which were aforedescribed with respect to FIGS. 1 to 4, parts of a device previously alluded to for feeding-in or inserting the weft thread bunch formed or the four weft threads 22 to 25.
  • This inserting device is formed essentially of a profiled tube 39, in which a pro jectile 38 is shot back and forth by a current of compressed air.
  • the projectile 38 carries a sliding member 37, which pulls the four weft threads 22 to 25 off stationary supply reels, not illustrated in the drawing.
  • the weft threads 22 to 25 are placed altematingly around the holding members 11 and 18. respectively, of the two discs 8 by means of feed or insert hooks employed in the aforementioned disclosed and described embodiment of the invention, and which have been represented, in the figures showing the embodiment, only b arrows for the sake of greater clarity.
  • Weft storage device for a warp knitting machine having knitting needles at a given location for knitting wefl and warp threads into a fabric web, comprising a first and second group of holding members spaced from one another at locations at which they are respectively adjacent opposite edges of a fabric web that is being knitted in the machine, said holding members being adapted to carry loops of weft threads and having rcspectlve axes about which they are rotatable, said holding members being disp laceable along a given path in direction toward the knitting needles; and rotary drive means for said holding members.
  • said rotary drive means comprising a plurality of pressure members mounted adjacent said given path and having means for frictionally engaging said holding members so as to produce rotation of said holding members about the respective axes thereof as said holding members are displaced along said given path.
  • Weft storage device including resiliently'and temporarily liftable pressure members mounted on said stationary pressure members.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
  • Looms (AREA)
US428232A 1972-12-27 1973-12-26 Weft storage device for warp knitting machines Expired - Lifetime US3906749A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2263561A DE2263561A1 (de) 1972-12-27 1972-12-27 Schussfadenspeicher fuer kettenwirkmaschinen

Publications (1)

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US3906749A true US3906749A (en) 1975-09-23

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US428232A Expired - Lifetime US3906749A (en) 1972-12-27 1973-12-26 Weft storage device for warp knitting machines

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US (1) US3906749A (de)
JP (1) JPS4994960A (de)
DD (1) DD109686A5 (de)
DE (1) DE2263561A1 (de)
IT (1) IT1000390B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110770379A (zh) * 2017-06-26 2020-02-07 下莱茵应用科学大学 用于供给线的装置和方法以及纺织机器

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3563061A (en) * 1968-08-06 1971-02-16 Reiners Walter Warp knitting machine
US3609997A (en) * 1968-09-04 1971-10-05 Hans Joachim Furst Warp knitting machine
US3616657A (en) * 1968-07-26 1971-11-02 Reiners Walter Warp knitting machine
US3620048A (en) * 1968-09-27 1971-11-16 Reiners Walter Weft supplying device for a warp knitting machine
US3643471A (en) * 1968-07-11 1972-02-22 Reiners Walter Warp knitting machine
US3648459A (en) * 1969-07-26 1972-03-14 Schlafhorst & Co W Warp knitting machine, particularly raschel machine
US3690126A (en) * 1970-05-16 1972-09-12 Schlafhorst & Co W Method of operating a warp knitting machine
US3701267A (en) * 1969-03-13 1972-10-31 Schlafhorst & Co W Warp knitting machine
US3705503A (en) * 1970-07-02 1972-12-12 Elitex Zavody Textilniho Apparatus for forming a system of weft threads for further processing in textile machines
US3732707A (en) * 1968-11-02 1973-05-15 Reiners W Weft supplying device for a warp knitting machine

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3643471A (en) * 1968-07-11 1972-02-22 Reiners Walter Warp knitting machine
US3616657A (en) * 1968-07-26 1971-11-02 Reiners Walter Warp knitting machine
US3563061A (en) * 1968-08-06 1971-02-16 Reiners Walter Warp knitting machine
US3609997A (en) * 1968-09-04 1971-10-05 Hans Joachim Furst Warp knitting machine
US3620048A (en) * 1968-09-27 1971-11-16 Reiners Walter Weft supplying device for a warp knitting machine
US3732707A (en) * 1968-11-02 1973-05-15 Reiners W Weft supplying device for a warp knitting machine
US3701267A (en) * 1969-03-13 1972-10-31 Schlafhorst & Co W Warp knitting machine
US3648459A (en) * 1969-07-26 1972-03-14 Schlafhorst & Co W Warp knitting machine, particularly raschel machine
US3690126A (en) * 1970-05-16 1972-09-12 Schlafhorst & Co W Method of operating a warp knitting machine
US3705503A (en) * 1970-07-02 1972-12-12 Elitex Zavody Textilniho Apparatus for forming a system of weft threads for further processing in textile machines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110770379A (zh) * 2017-06-26 2020-02-07 下莱茵应用科学大学 用于供给线的装置和方法以及纺织机器
CN110770379B (zh) * 2017-06-26 2021-07-09 下莱茵应用科学大学 用于供给线的装置和方法以及纺织机器

Also Published As

Publication number Publication date
DD109686A5 (de) 1974-11-12
IT1000390B (it) 1976-03-30
JPS4994960A (de) 1974-09-09
DE2263561A1 (de) 1974-07-04

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