US3469421A - Yarn take-up mechanism for straight bar knitting machines - Google Patents

Yarn take-up mechanism for straight bar knitting machines Download PDF

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Publication number
US3469421A
US3469421A US626142A US3469421DA US3469421A US 3469421 A US3469421 A US 3469421A US 626142 A US626142 A US 626142A US 3469421D A US3469421D A US 3469421DA US 3469421 A US3469421 A US 3469421A
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United States
Prior art keywords
yarn
slide
straight bar
plate
cam
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Expired - Lifetime
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US626142A
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English (en)
Inventor
Dennis Alan Cozens
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William Cotton Ltd
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William Cotton Ltd
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Publication date
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
    • D04B15/48—Thread-feeding devices
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B11/00—Straight-bar knitting machines with fixed needles

Definitions

  • This invention is for improvements in or relating to straight bar knitting machines and concerns yarn take-up mechanism.
  • the conventional yarn take-up mechanism known as snapping tackle comprises a rigid arm on a cam-rotatable rod and a spring arm superimposed on the rigid arm and secured at one end to the root end of the rigid arm and at its other free end overlying a fixed rod with the yarn extending between the two arms.
  • the rotatable rod holds the rigid arm in a down position so that the spring arm is held by the fixed rod deflected upwardly from the rigid rod and the yarn is thereby allowed to run freely through the device.
  • the rotatable rod is in an up position in which it lifts the spring arm clear of the fixed rod so that the yarn is gripped between the two arms and the rotatable rod has a motion to raise and lower the two arms together thereby to raise and lower the yarn to follow the knitting motions of the needles; this maintains constant tension in the yarn i.e. without undue tightness or slackness.
  • the passage of the yarn to the snapper is in substantially horizontal direction and its passage from the snapper is downwardly.
  • the rotatable rod lowers the arms to separate them for free running of the yarn during the draw.
  • An object of the invention is to provide yarn take-up mechanism which is of such improved construction that it can be operated to provide, for example, for the avoidance of the slack above referred to when making the special fabric joints for intarsia fabric.
  • the invention provides straight bar knitting machine yarn take-up mechanism comprising, a pair of superimposed yarn engageable members to, from and be tween which the passage of yarn from a supply to a thread carrier can be in a straight path, means coupling the members together for joint displacements in directions longitudinally of the yarn, means mounting the members for relative displacements therebetween in directions transversely of the yarn for gripping or releasing the yarn, and means for effecting the displacements in such corelated manner as to provide for running of the yarn either freely, or controlled to any suitable extent, at any suitable times.
  • yarn can be caused at any time to have any required degree of tightness and slackness, and to be free running or otherwise at will, so that for example when making fabric joints for intarsia fabric, by the special method hereinbefore referred to, the aforesaid slack in the yarn can be avoided. It is also apparent that in many other instances the yarn can be caused to be in required conditions more accuartely than heretofore.
  • a first of the yarn engageable members is mounted on a first slide member adapted for displacements longitudinally of the yarn
  • a second of the yarn engageable members is adapted for like movements with the first yarn engageable member by being mounted on a rod projecting transversely from the first slide member
  • the second yarn engageable member is adapted for displacements transversely of the yarn by being spring biased against a second slide member which is adapted for displacements longitudinally of the yarn and is. also connected by a pin and inclined slot connection to a. stationary member so that the longitudinal movements are converted to transverse movements.
  • the spring is also arranged to bias the second yarn engageable member in a direction towards the first yarn engaging member.
  • first yarn engageable member is disposed at the underside of a horizontally extending part of the yarn with the second yarn engageable member at the upper side of the yarn.
  • transverse rod extends from the first slide member through holes in both yorn engageable members, and a transverse hole is provided in the transverse rod for passage of the yarn therethrough.
  • the second slide member is conveniently composed of opposite side parts, and the spring biased second yarn engageable member is of upturned channel form with its underside edges riding on the sides of said slide.
  • the first and second slide members are connected by link and lever mechanism to separate cam followers engaging separate cams.
  • the invention also provides straight bar knitting machine take-up mechanism wherein upper and lower yarn gripper plates are spring biased together and are applied to a horizontally running part of the yarn, the lower plate member is secured on a cam operated horizontally displaceable upper slide member for joint displacements of the plate members horizontally and longitudinally of the yarn, and the upper plate member has depending side walls riding on side parts of a cam operated horizontally displaceable lower slide member which has pin and inclined slot connection with a stationary member to convert the latters horizontal motion to a vertical motion of the upper plate member, so that the plate members alternatively grip or release the yarn at any required stage in relation to the horizontal displacements, whereby accurate control of the yarn is readily obtainable when required in substantially unlimited manner.
  • FIGURE 1 is a general cross sectional view of part of a straight bar knitting machine embodying yarn takeup mechanism according to the invention.
  • FIGURE 2 is a side view of the yarn take-up mechanism.
  • FIGURE 3 is a perspective view of the yarn take-up mechanism.
  • FIGURE 4 is a longitudinal sectional view of the mechanism.
  • FIGURES 5 is a cross sectional view of the mechanism.
  • FIGURE 6 is an enlarged face view of part of intarsia fabric made with special sinkers.
  • FIGURE 7 is a perspective view of part of the sinker bar showing the special sinkers.
  • FIGURE 8 is an enlarged side view showing one of the special sinkers.
  • FIGURE 9 is a front view of needles, sinkers, thread carrier and yarn at one stage in the production of the intarsia fabric.
  • FIGURE 10 is an enlarged view of part of FIGURE 1.
  • a straight bar knitting machine is represented by bearded needles 1 operated by usual cam operated mechanism 2, usual sinkers or dividers 3 mounted in the usual sinker bed 4 on a machine rail 5 and usual thread carrier bars 6 mounting thread carriers such as the thread carrier indicated at 7.
  • On a second machine rail 8 is mounted a support frame 9 for a yarn package 10, and for eyelet yarn guides 11 to 11d by which the yarn Y is guided from the yarn package 10 to the thread carrier 7 including in a horizontal path indicated at Y1.
  • a cymbal yarn tensioner 12 At the trailing end of the yarn along the path Y1, there is a cymbal yarn tensioner 12.
  • the yarn in the yarn path Y1 extends through a yarn take-up device indicated generally at 13, FIGURES 1 and 10.
  • This device comprises a stationary base support 14 on which is mounted a pair of yarn engaging members 15, 16.
  • the yarn engaging member 15 is a strip metal member having a horizontal portion 15a disposed directly at the underside of the yarn Y, and it is bent at its ends to provide portions 15b, 150 which are secured to a slide member 17, and also to provide eyelet yarn guides 18, 18a through which the yarn extends.
  • the slide member 17 mounts an upstanding peg 19 which extends through a hole in the portion 15a of the yarn engaging member 15 and also through a hole in the yarn engaging member 16.
  • the latter is of upturned channel form comprising a horizontal portion 161:, disposed over the yarn Y, and downwardly depending side walls 16b, 160, see FIGURE 5, on the opposite sides of the yarn Y, the yarn engaging member 15, and the slide member 17.
  • On the peg 19 is a coil spring 20 disposed between the yarn engaging member 16 and a collar 21 on the peg thereby to bias the yarn engaging member 16 downwardly towards the yarn Y and towards the yarn engaging member 15.
  • the peg 19 has a transverse hole 190, FIGURE 4, for the yarn Y to extend therethrough.
  • the side walls 161), of the yarn engaging member 16 have lower out-turned flanges 16d, 16c, FIGURE 5, which ride on upper horizontal edges of opposite side slide parts 27, 27a.
  • These slide parts 27, 27a are connected to the stationary member 14 by pins 28, 28a, FIGURES 1, 10 and 2, secured to the stationary member 14, and cooperating inclined slots 29, 29a formed in the slide parts 27, 27a.
  • the slide member 17 is connected by a link 30 to an arm 31, FIGURE 1, on a rod 31a which also has an arm 31b connected by a link 32 to a cam follower lever 33 having a cam follower 34 engaging a cam 35 on the main cam shaft 36.
  • the side slide parts 27, 27a are connected by a link 37 to an arm 38 on a rod 38a which also has an arm 38b connected by a link 39 to a cam follower lever 40 having a cam follower 41 engaging a cam 42 on the main cam shaft 36.
  • the cams 35, 42 have rises and falls to suit requirements of operations of the yarn engaging members 15, 16, it being understood that operation of cam 35 will cause displacements of the slide member 17, and consequently of the yarn engaging members 15, 16 longitudinally of the yarn Y and that operation of the cam 42 will cause longitudinal displacements of the side slide parts 27, 27a which, through the pin and inclined slot connections, will cause the slide parts 27, 27a to be raised or lowered thereby to raise or lower the yarn engaging member 16 towards and away from the yarn Y and from the yarn engaging member 15.
  • the upward movement of the yarn engaging member 16, i.e. away from the yarn and yarn engaging member 15, is positive against the action of the spring 20, and the lowering of the yarn engaging member 16 into engagement with the yarn Y is by the spring 20.
  • the yarn engaging members 15, 16 can be carried by the slide member 17 in a direction longitudinally of the yarn without carrying the yarn with it. Consequently it is possible by providing suitable rises and falls on the cams, to provide for any required condition in the yarn, i.e. as regards degree of tightness, slackness, and free running or otherwise to suit any particular requirements at any time.
  • intarsia fabric illustrated in FIGURE 6 For example considering the making, by the machine, of intarsia fabric illustrated in FIGURE 6, it will be seen that this fabric is characterized by having, at the joint A between two fabric areas B and C, overlapping open loops L of yarn which are not complete knitted loops.
  • This construction is formed by the use of special sinkers indicated at 3a, FIGURE 7, which have undercut front edges 3b, and alternate with dividers 3.
  • FIGURE 8 One of these special sinkers 3a is indicated enlarged in FIGURE 8 in relation to the normal type sinker or divider 3, needle 1, and thread carriers 7.
  • FIGURE 9 illustrates a front view of FIGURE 8 showing a plurality of the sinkers and needles with one thread carrier 7.
  • This thread carrier 7 in FIGURE 9 is shown at a stage where yarn is taken around a needle for the joint A in FIGURE 6.
  • the arrangement is such that in order to produce the open loop connections L of FIGURE 6 without forming the yarn into complete knitted loops, the yarn must be defiected downwardly by the undercut front edge 3b of the adjacent sinker 3a.
  • the yarn Y is caused by necessary operation of the snapping tackle to become slack, and this has led to the yarn riding over the tops of the undercut front edges 3b of the sinkers 3a as indicated by the yarn Y shown in broken lines in FIGURE 9.
  • the necessary movement of the yarn engageable members 15, 16 in a direction from right to left can be effected with the cam 42 operating on the side slide parts 27, 27a to hold the yarn engaging member 16 in its up position clear of the yarn so that the yarn is not carried with the yarn engaging members and consequently no slack is formed.
  • the yarn is satisfactorily engaged by the undercut front edges 3b of the sinkers 3a and satisfactory joints are made in the intarsia fabric.
  • the cam 42 would again hold the yarn engaging member 16 clear of the yarn.
  • the cam 42 would operate to hold the yarn engaging member 16 in its low gripping position for the yarn while the cam 35 is operated to displace the slide member 17 and consequently the yarn engaging members 15 and 16 in opposite directions in synchronism with the movements of the needles.
  • a yarn gripper device mounted in said straight path and comprising a first plate extending over said straight path and a second plate extending under said straight path, mounting means for said first and second plates allowing for opening and closing movements thereof and joint displacements thereof longitudinally of said straight path, a first operating mechanism connected to said first plate for imparting to the latter its opening and closing movement, a second Operating mechanism connected to said second plate for imparting to the latter and said first plate their displacements longitudinally of said straight path, and co-related cams connected to said first and second operating mechanisms respectively for effecting at required different times, required combinations of the yarn gripper device being open, closed, and displaced in yarn feed and reverse directions.
  • said mounting means includes a peg extending freely through said second plate and freely mounting said first plate, with spring means on said peg biasing said first plate towards said second plate.
  • said mounting means includes a support, a first slide on said support and on which said first plate is slidably mounted, spring means by which said first plate is biased against said first slide, a second slide secured to said second plate, peg and inclined slot means attaching said first slide to said support for sliding motion of said first slide in one direction to cause opening of said first plate from said second plate and in the return direction to allow said spring means to close said first plate onto said second plate, and connecting means connecting said first and second cam operated mechanisms to said first and second slides.
  • said mounting means includes a first slide on which said first plate is slidably mounted, and a second slide to which said second plate is secured, said first slide comprising two parts on opposite-sides of said second slide, said first plate being of inverted U form having side walls slidable on said two parts of said first slide, and means connecting said first and second cam operating means to said two parts of said first slide and to said second slide respectively.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US626142A 1966-04-16 1967-03-27 Yarn take-up mechanism for straight bar knitting machines Expired - Lifetime US3469421A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB16767/66A GB1145182A (en) 1966-04-16 1966-04-16 Improvements in or relating to straight bar knitting machines

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US3469421A true US3469421A (en) 1969-09-30

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US626142A Expired - Lifetime US3469421A (en) 1966-04-16 1967-03-27 Yarn take-up mechanism for straight bar knitting machines

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US (1) US3469421A (fr)
CH (1) CH467372A (fr)
DE (1) DE1635756A1 (fr)
FR (1) FR1519100A (fr)
GB (1) GB1145182A (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3446567C1 (de) * 1984-12-20 1986-05-07 Lindauer Dornier Gmbh, 8990 Lindau Schussfadenbremse mit stufenweise steuerbarer Bremswirkung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1238716A (en) * 1913-02-03 1917-08-28 Scott & Williams Inc Yarn take-up and tension for knitting-machines.
US2309026A (en) * 1941-11-03 1943-01-19 Nolde & Horst Co Thread tensioning mechanism for textile fabricating machines
GB771757A (en) * 1953-08-24 1957-04-03 Cotton Ltd W Improvements in or relating to straight bar knitting machines
US2899811A (en) * 1959-08-18 Straight bar knitting machines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899811A (en) * 1959-08-18 Straight bar knitting machines
US1238716A (en) * 1913-02-03 1917-08-28 Scott & Williams Inc Yarn take-up and tension for knitting-machines.
US2309026A (en) * 1941-11-03 1943-01-19 Nolde & Horst Co Thread tensioning mechanism for textile fabricating machines
GB771757A (en) * 1953-08-24 1957-04-03 Cotton Ltd W Improvements in or relating to straight bar knitting machines

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Publication number Publication date
DE1635756A1 (de) 1971-05-13
FR1519100A (fr) 1968-03-29
GB1145182A (en) 1969-03-12
CH467372A (fr) 1969-01-15

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