US3916649A - Weft inserting apparatus for a warp knitting machine - Google Patents

Weft inserting apparatus for a warp knitting machine Download PDF

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Publication number
US3916649A
US3916649A US562407A US56240775A US3916649A US 3916649 A US3916649 A US 3916649A US 562407 A US562407 A US 562407A US 56240775 A US56240775 A US 56240775A US 3916649 A US3916649 A US 3916649A
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Prior art keywords
thread
chain
threads
weft
guide
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Expired - Lifetime
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US562407A
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English (en)
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Karl Kohl
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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

  • thread guide Comprises a Single chain or a pair f 6 n h i g d i th f f a fig 8 Th t [58] held of Search 66/84 84 A; sioning means is an endless chain equipped with grip- 28/1 in cli devices for takin the free end of the thread P g P g from the guide means and drawing 1t away therefrom.
  • This invention relates generally to warp knitting machines and more particularly to an improved weft inserting apparatus for use on warp knitting machines.
  • German Patenschrift 2,034,286 in which the threads from a plurality of weft spools are fed to a tensioning chain via a plurality of specially shaped and moveable lever guides.
  • One disadvantage of an approach such as this is that additional undesirable friction forces are exerted upon the threads due to the long length of the lever guides through which they must pass.
  • the chain is an endless chain in the shape of a figure 8. Approximately half of the length of the chain includes a plurality of hollow pins which carry each individual weft thread.
  • An illustration of the endless type of chain thread guide as disclosed in the Umeda, et al patent is shown as prior art in FIG. 1. According to a second embodiment of the Umeda, et al.
  • the thread guide device comprises a pair of chains, one located above the other so as to form a Figure 8.
  • Anillustration of this embodiment is shown in FIG. 2 as prior art.
  • FIG. 3 shows the use of such prior art thread guides in the context of warp knitting machines.
  • the specification of the Umeda, et al. patent U.S. Pat. No. 3,703,818 is hereby incorporated by reference.
  • a plurality of weft threads are supplied to a thread guide from a plurality of weft supply spools.
  • the thread guide comprises a single chain or a pair-of chains arranged in the form of a figure 8.
  • Weft threads are passed from the continuous thread guide to a tensioning means comprising an endless chain equipped with gripping devices for taking the free end of the thread from the guide means and drawing it away therefrom.
  • the thread guide is angularly displaced relative to the tensioning chain in such a fashion as to draw the thread out of the thread guide at an angle of approximately
  • the tensioning chain thereafter presents one end of the thread to a first weft inserting chain.
  • a second weft inserting chain grasps the second end of the thread from the thread guide apparatus.
  • the weft threads are then presented to the warp knitting machine in a conventional fashion.
  • One important feature of the invention is the fact that it greatly reduces the thread abrasion formerly associated with weft inserting devices.
  • the reduced abrasion is in large part attributable to the fact that the thread is drawn from the spools through the thread guide and to the tensioning chain in a relatively direct path. This is distinguishable from many prior art devices in which the path of the thread often had to round many corners and curves.
  • By reducing the comers and curves associated with prior art thread paths it was possible, by means of this invention, to avoid much unnecessary thread abrasion. This decreased thread abrasion, in turn, results in less thread breakage and greater overall machine efficiency.
  • FIG. 1 is a side elevation view of a prior art thread guide according to the endless chain figure 8 variety.
  • FIG. 2 is a side elevation view of another prior art embodiment of a thread guide incorporating two chains arranged in theform of a figure 8.
  • FIG. 3 is a plan view of aprior art weft inserter incorporating the figure 8 type of thread guide.
  • FIG. 4 is a top plan view of the present invention shown in its entirety.
  • FIG. 5 is a side elevation view of the embodiment of FIG. 4.
  • FIG. 1 of this disclosure is substantially identical to FIG. 2 of U.S. Pat. No. 3,703,818.
  • FIG. 2 of this disclosure is substantially identical to FIG. 8 of the same Umeda, et al. patent.
  • One advantage of these figure 8 thread guides is that they can feed a plurality of weft threads to a warp knitting machine without causing the threads to become twisted.
  • the figure 8 thread guides are able to avoid the twisting problem due to the fact that the twist imparted to the thread at the top of the figure 8 is reversed by the twist given to the thread at the bottom of the figure 8. While these devices are relatively new, nevertheless they are known to those of ordinary skill in the art.
  • FIGS. 4 and 5 The present invention according to a preferred embodiment thereof is illustratedin FIGS. 4 and 5.
  • a pair of magazine type chains 1 and 2 of equal length are provided at either side of the machine. Chains 1 and 2 are shown disposed at an angle of 90 from their true orientation in order to better illustrate their function.
  • a plurality of needles 3 is likewise shown at approximately 90 from their true orientation for purposes of clearer illustration.
  • Chains l and 2 are provided with a plurality of thread clips 7 of the sort known to those of ordinary skill in the art.
  • the purpose of the clip 7 is to grip the weft threads 5 and in the case of chains land 2 to present them to the needles 3.
  • Located at the opposite end of chains 1 and 2 from the needles 3 is a tensioning chain 4'likewise equipped with a plurality of thread clips 7.
  • the tensioning chain 4 is disposed at an angle with respect to chains 1 and 2.
  • Thread guide 6 Located at. oneside of the machine and shown in crosshatching is thread guide 6.
  • Thread guide 6 is the relatively new figure 8 type of thread guide discussed in the Umeda, "at al. U.Sl Pat. No. 3,703,818.
  • Thread guide 6 may comprise a single chain formed in the configurationof a figure 8 such as that illustrated as prior art in FIG. 1.
  • thread guide 6 could be a pair of individual chains arranged one above the other in the form of a figure 8 such as that illustrated as priorart in FIG. '2, I
  • the weft threads 5 are supplied from a thread source or rack 9 which includes a plurality of rigidly mounted weft thread spools 10.
  • Each spool 10 has associated with it a reserve spool which is attached thereto and which is automatically brought into supplying arrangement when the first spool is exhausted of thread.
  • the thread 5 supplied from spool 10 passes through thread guide 6 and is presented to one end of tensioning chain 4.
  • the free-end of thread 5 is gripped by'thread clip 7 and drawn away from thread guide 6 in a manner illustrated in FIG. 4.
  • the free end is picked up by a thread clip 7 on chain 2 and by another thread clip 7 on chain 1.
  • the thread is then cut at the end close to chain 1 and presented in parallel fashion to the knitting needles 3.
  • the weft threads 5 stay in a substantially parallel relationship.
  • the thread 5 is drawn out of thread guide 6 by tension chain 4 at an angle of substantially 90 with respect tothread guide 6. In this manner, the..
  • threads 5 describe a substantially direct and straight path from the spool 10 to the tensioning chain 4 thereby greatly minimizing the abrasion associated with causing thev thread to go around sharp curves or cor-
  • the speed of the chain 6 be the same as the velocity of the tension chain 4 in the direction of the needles 3. Therefore, the true velocity of the tension chain 4 is greater than the true velocity of tension chain 6 in order for the component of the tension chain velocity in the direction of the needles 3 to be the same as the velocity of the thread guide6.
  • the velocity of the chain Va is the sum of its vector components Vcl and Vc2, therefore it isnece ssarilly obvious that Vcl must equal Vg. (i.e. Vg Vcl). Because Vc is the resultant of two perpendicular ,factors V cl and Vc2, therefore the speed of the tension chain Vc must be greater than the speed of the thread guide chain Vg. According to this. illustration, the speed of the thread guide chain Vg is equal to the approach velocity Vtl of the threads 5 towards the chains 1 and 2. In practice,- the velocity of approach of the threads. 5 herein described as Vtl may be equal to the velocity V12 with which chains 1 and 2 deliver the thread 5 to the needles 3. However, this need not necessarily be the exact relationship.
  • the relative angle Agc between thread guide 6 and tension chain 4 corresponds to the angle subtended between vector Vc and vector Vg. According to that illustration, the greater the angle Agc is the faster velocity Vc must be in .order that component Vcl equals V
  • the present invention allows the user to employ a shorter figure 8 type of thread guide than has heretofore been associated with warp knitting machines.
  • Prior art uses of figure ,8 thread guides have required guides with lengths in the order of 20 feet in order to span the width of the machine. (See FIG. ,3).
  • the length of the figure 8 thread guide can be considerably shorter since it does not have to span the entire width of the machine.
  • a flexible band type' ofth read guide means for moveably guiding of saidlth'reads, sai d threads passing through saidthread de'mean si an endless weft te n'sipni means for taking said threads from said guide r'neajns arid drawing them 4.
  • said tensioning means includes an endless chain having means thereon for gripping said threads.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US562407A 1974-04-10 1975-03-27 Weft inserting apparatus for a warp knitting machine Expired - Lifetime US3916649A (en)

Applications Claiming Priority (1)

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DE2417492 1974-04-10

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JP (1) JPS50138161A (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4194943A (en) * 1977-02-18 1980-03-25 Karl Mayer Textilmaschinen Fabrik Gmbh Modified warp knitting machine for the production of netting by heat sealed weft insertion
US4220020A (en) * 1977-08-17 1980-09-02 Karl Mayer Textilmaschinenfabrik Gmbh Warp knitting machine with weft inserters
US4845960A (en) * 1983-10-31 1989-07-11 Burlington Industries, Inc. Weft insertion fabric with terry effect
CN104562419A (zh) * 2014-12-01 2015-04-29 常州市第八纺织机械有限公司 新型铺纬小车

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2000643A (en) * 1933-04-01 1935-05-07 Morton James Apparatus for supplying fibrous material for incorporation in fabrics
US2743596A (en) * 1952-09-04 1956-05-01 Kidde Mfg Co Inc Apparatus for delivering weft threads for incorporation in fabric being knitted
US3606769A (en) * 1969-06-16 1971-09-21 Stevens & Co Inc J P Continuous weft feed for warp knitting machines
US3636731A (en) * 1970-08-04 1972-01-25 Robert F Jones Tension-relaxing device for feeding filling threads to a warp knitting machine
US3680332A (en) * 1970-07-22 1972-08-01 Travis Mills Apparatus for feeding filling threads to a warp knitting machine
US3703818A (en) * 1969-12-29 1972-11-28 Toyo Boseki Apparatus for feeding warps or filling threads to knitting machine
US3771330A (en) * 1969-10-20 1973-11-13 Stevens & Co Inc J P Apparatus for feeding filling threads to a warp knitting machine
US3785175A (en) * 1971-05-14 1974-01-15 Schlafhorst & Co W Apparatus for inserting weft thread bunches into weft thread storage devices in warp knitting machines
US3797278A (en) * 1972-12-04 1974-03-19 K Kohl Warp knitting machine

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2000643A (en) * 1933-04-01 1935-05-07 Morton James Apparatus for supplying fibrous material for incorporation in fabrics
US2743596A (en) * 1952-09-04 1956-05-01 Kidde Mfg Co Inc Apparatus for delivering weft threads for incorporation in fabric being knitted
US3606769A (en) * 1969-06-16 1971-09-21 Stevens & Co Inc J P Continuous weft feed for warp knitting machines
US3771330A (en) * 1969-10-20 1973-11-13 Stevens & Co Inc J P Apparatus for feeding filling threads to a warp knitting machine
US3703818A (en) * 1969-12-29 1972-11-28 Toyo Boseki Apparatus for feeding warps or filling threads to knitting machine
US3680332A (en) * 1970-07-22 1972-08-01 Travis Mills Apparatus for feeding filling threads to a warp knitting machine
US3636731A (en) * 1970-08-04 1972-01-25 Robert F Jones Tension-relaxing device for feeding filling threads to a warp knitting machine
US3785175A (en) * 1971-05-14 1974-01-15 Schlafhorst & Co W Apparatus for inserting weft thread bunches into weft thread storage devices in warp knitting machines
US3797278A (en) * 1972-12-04 1974-03-19 K Kohl Warp knitting machine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4194943A (en) * 1977-02-18 1980-03-25 Karl Mayer Textilmaschinen Fabrik Gmbh Modified warp knitting machine for the production of netting by heat sealed weft insertion
US4220020A (en) * 1977-08-17 1980-09-02 Karl Mayer Textilmaschinenfabrik Gmbh Warp knitting machine with weft inserters
US4255947A (en) * 1977-08-17 1981-03-17 Karl Mayer Textil-Maschinenfabrik Gmbh Warp knitting machine with weft insertion apparatus
US4845960A (en) * 1983-10-31 1989-07-11 Burlington Industries, Inc. Weft insertion fabric with terry effect
CN104562419A (zh) * 2014-12-01 2015-04-29 常州市第八纺织机械有限公司 新型铺纬小车
CN104562419B (zh) * 2014-12-01 2016-08-17 常州市第八纺织机械有限公司 新型铺纬小车

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Publication number Publication date
JPS50138161A (ja) 1975-11-04

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