US3570269A - Means for and method of operating the needles of warp knitting machines - Google Patents

Means for and method of operating the needles of warp knitting machines Download PDF

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Publication number
US3570269A
US3570269A US821784A US3570269DA US3570269A US 3570269 A US3570269 A US 3570269A US 821784 A US821784 A US 821784A US 3570269D A US3570269D A US 3570269DA US 3570269 A US3570269 A US 3570269A
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United States
Prior art keywords
needles
stitches
course
latches
yarn
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Expired - Lifetime
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US821784A
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English (en)
Inventor
John D Wenrich
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Boeing North American Inc
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North American Rockwell Corp
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B27/00—Details of, or auxiliary devices incorporated in, warp knitting machines, restricted to machines of this kind

Definitions

  • guard means for the latches in the form of a wire rod which was mounted in the sinkers, as disclosed in US. Pat. No. 2,810,278 or in the form of a fiat bar as disclosed in British Pat. No. 913,823.
  • the guard means of both patents were movable to an active position to intercept and prevent the latches of the needles closing as the stitches of each newly formed course were cleared below the open latches and to an inactive position to permit the latches to be closed by stitches of the new course as the needles were lowered to draw yarn for the stitches of the next course and knock off the stitches of the previously formed course.
  • the instant invention has for its principal object the elimination of the guard means described above and the substitution of a method of and a means for operating pivoted latch needles of a warp knitting machine in such manner that the stitches of each new course open and hold the needle latches open while yarns for the next course of stitches are lapped around the needles.
  • the invention resides in the provision of means for and to the method of operating pivoted latch needles of a warp knitting machine along a knitting path from a low level in which the needles have drawn yarn for a new course of stitches through the stitches of a previously formed course and have cast off the previously formed course of stitches from the needles, to an intermediate level in which the stitches of the new course 3,570,269 Patented Mar.
  • FIG. 1 is a schematic elevational view of a portion of a warp knitting machine with means for operating the needles of the machine in accordance with the instant invention
  • FIG. 2 is an end elevational view on an enlarged scale showing a portion of the stitch forming and yarn feeding elements of the machine of FIG. 1;
  • FIG. 3 is a view diagrammatically illustrating the path of movement of the needles along a line which is plotted in relationship to the angle of rotation of the operating shaft for the needles during stitch forming cycles thereof;
  • FIG. 4 is a view on an enlarged scale illustrating the relative positions of the stitch forming and yarn feeding elements at one stage of a stitch forming cycle thereof;
  • FIGS. 5 and 8 are views similar to FIG. 4 showing the relative positions of the elements at other stages in the stitch forming cycle.
  • FIGS. 1 and 2 of the drawings there is shown a portion of a high speed warp knitting machine adapted to form courses of stitches of knitted fabric the machine including a latch needle 10, which is one of a row of such needles, having a hook portion 11 and a pivoted latch 12 for closing the hook portion.
  • the machine also includes a bar 15 in which the needles are mounted, sinkers 16 in the spaces between the needles and yarn guides 17.
  • the bar 15 is supported on levers, one of which is shown at 20 mounted for rocking movement on a shaft 21 whereby the needles are adapted to be operated along a knitting path as hereinafter set forth.
  • the yarn guides 17 are carried in bars 30 which are mounted on a rock shaft 31 for movement through and along the row of needles to lap yarns 35 (FIG. 2) fed by the guides around the needles to be formed into stitches by the needles.
  • sinkers 16 and yarn guides 17 are operated along cooperating paths to form stitches of yarns 3-5 fed by the yarn guides to the needles, with the needles rising from a low level following drawing yarn for a course of stitches to a high level.
  • the sinkers 16 are advanced to engage and hold the new stitches in the sinker throats 26 and the newly formed stitches open the latches 12 of the needles and thereafter are cleared below the opened latches.
  • the guides are then operated through and along the needle row while the needles are at the high level to lap yarn for the next course of stitches around the needles between the hooks and open latches thereof.
  • the needles are then lowered from the high level to the low level to draw yarn for the next course of stitches and cast the previously formed stitches therefrom.
  • the latches tend to fiy to closed position.
  • the yarn is lapped around the closed latches and no stitches are formed by the needles.
  • the machine was provided with a guard member which was moved between an active position to prevent the latches from closing during stitch clearing and an inactive position to permit the latches to be closed by the cleared stitches as the needles were lowered to form the new stitches.
  • the latches of the needles are retained in open position during the yarn lapping operation of the yarn guides without the use of the conventional latch guard.
  • the needles 10 are adapted to be operated by a crank shaft 36 through mechanism as shown in FIG. 1 of Pat. No. 3,375,682.
  • This mechanism has been diagrammatically illustrated in FIG. 1 herein for the purposes of simplicity as a crank 37 and a link 38 connecting the crank shaft 36 and the levers 20.
  • the levers 20 are operated by the crank shaft, through crank 37 and link 38, to move the needles 10 along a knitting path illustrated by the dot-and-dash line 40 in FIG. 2 and as indicated in the curve 41 in FIG.
  • the movement of the needles along the path 40 is from a low level 42 at point a on the curve to an elevated intermediate level 45 at point I).
  • the needles 10 momentarily dwell at the intermediate elevated level 45 between the point 12 and a point and then rise to a further elevated highlevel 46 at point d. From the high level the needles are again lowered to the low level at point a in the curve.
  • the needles are moved along the knitting path 40 between the low, intermediate and high levels for purposes hereinafter set forth.
  • the needles are moved from the high level to the low level to draw yarn for a new course of stitches, indicated at 50 in FIG. 4-, through a previously formed course of stitches and to cause the latter to be cast or knocked off the needles.
  • the latches of the needles which were closed by the previously formed stitches, remain closed, the sinkers have been partially advanced to position the nebs 22 thereof over the previously formed stitches and also over the yarn for the new course of stitches, and the yarn guides 17 are in their normal position of rest to the left of the needle row.
  • the needles move from the low level shown in FIG. 4, corresponding to level 42 of FIG. 3, to the intermediate level of FIG. 5, corresponding to level 45 of FIG.
  • the sinkers 16 are moved to their fully advanced positions to engage and hold the stitches of the course 50 in their throats 26, the stitches of the course 50 during this movement opening the latches 12 of the me dles.
  • the lower ends of the opened latches are slightly below the throats 26 of the sinkers and the stitches of the course 50 overlie and hold the latches open in the intermediate level of the needles.
  • the yarn guides 17 are rocked through the needle row from the left to the right side thereof, as shown by the dotted line position of the guides in FIG. 6.
  • the guides are then moved along the needle row and thence back to their position of rest at the left side of the needle row to lap yarns 35 around the needles between the hook portions 11 and open latches 12 thereof for the next course of stitches.
  • the needles then rise to the high level of FIG. 7 corresponding to the level 46 of FIG. 3, to clear the stitches of the course 50' to a position on the needles below the open latches. As the needles are lowered from the high level of FIG. 7 to the level of FIG.
  • the instant invention provides an operating path for pivoted latch needles of a Warp knitting machine the path including a low level to which the needles move in drawing yarn for each new course of stitches, an intermediatte dwell level in which the latches of the needles are opened and maintained in open position by the stitches of the new course while yarn is lapped around the needles for the next course of stitches and a high level to which the needles are moved to clear the new course of stitches below the open latches before the needles again return to the low level to draw yarn for the next course of stitches and cast off the previously formed course of stitches.
  • a warp knitting machine having a row of pivoted latch needles, sinkers for cooperation with said needles, and yarn guides for feeding yarns to said needles to be formed thereby into courses of stitches of a fabric
  • the improvement comprising means for moving said needles along a path from a low level, to which said needles were moved in drawing yarn for stitches of a first course of said fabric, to an intermedaite level in which said stitches of said first course rest on open latches of said needles, means for causing said needles to dwell in said intermediate level to maintain said latches open While said yarn guides lap yarns fed thereby around said needles for stitches of a second course of said fabric, means for moving said needles to a high level in said path during which movement said stitches of said first course are cleared below said open latches, and means for moving said needles from said high level to said low level to draw yarn for said stitches of said second course through said stitches of said first course and to cast off said stitches of said first course from said needles.
  • said sinkers have a neb and a throat portion, the lower ends of said open latches being below said throat portions of said sinkers and said throat portions acting to position said stitches of said first course on said open latches when said needles are in said intermediate level.
  • a method of knitting fabric on a warp knitting machine having a row of pivoted latch needles, yarn guides for lapping yarn around said needles to be formed thereby into courses of stitches of said fabric, and sinkers cooperating with said needles during formation of said courses of stitches by said needles including the steps of (a) raising said needles from a low level in which the latches of said needles are closed over the stitches of a first course of said fabric lying in the hooks of said needles to an intermediate level during which movement said stitches of said first course open said latches and become positioned on said open latches.
  • a method according to claim 3 including the additional steps of (f) advancing said sinkers to hold said stitches of said 10 first course in throat portions of said sinkers as said needles are raised from said low level to said intermediate level and from said intermediate level to said high level, and

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US821784A 1969-05-05 1969-05-05 Means for and method of operating the needles of warp knitting machines Expired - Lifetime US3570269A (en)

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US82178469A 1969-05-05 1969-05-05

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US (1) US3570269A (es)
DE (1) DE2010997A1 (es)
FR (1) FR2042397B1 (es)
GB (1) GB1230966A (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3857260A (en) * 1972-06-05 1974-12-31 A Zwingenberger Sinker arrangement for warp knitting and raschel machines
US3890807A (en) * 1972-12-02 1975-06-24 Schlafhorst Co Maschf Driving mechanism for knitting needle displacement in warp knitting machines, such as raschel machines, particularly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3112530A1 (de) * 1981-03-30 1982-10-07 Johann B. 6530 Bingen Pfeifer Wandverkleidungselement mit daran befestigten waermeleitrohren

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3857260A (en) * 1972-06-05 1974-12-31 A Zwingenberger Sinker arrangement for warp knitting and raschel machines
US3890807A (en) * 1972-12-02 1975-06-24 Schlafhorst Co Maschf Driving mechanism for knitting needle displacement in warp knitting machines, such as raschel machines, particularly

Also Published As

Publication number Publication date
FR2042397A1 (es) 1971-02-12
GB1230966A (es) 1971-05-05
DE2010997A1 (de) 1970-11-19
FR2042397B1 (es) 1973-03-16

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