US3700153A - Yarn feeder for a knitting machine - Google Patents

Yarn feeder for a knitting machine Download PDF

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Publication number
US3700153A
US3700153A US121440A US3700153DA US3700153A US 3700153 A US3700153 A US 3700153A US 121440 A US121440 A US 121440A US 3700153D A US3700153D A US 3700153DA US 3700153 A US3700153 A US 3700153A
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United States
Prior art keywords
yarn
feed cylinder
cylinder
yarn guide
guide
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Expired - Lifetime
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US121440A
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English (en)
Inventor
Jean-Paul Delair
Jean-Pierre Raisin
Eugene Voisin
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Individual
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Individual
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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

Definitions

  • a yarn feeder for a knitting machine comprises a v rotatable cylinder having an outer surface possessing a high'coefficient of friction.
  • a yarn guide is mounted for rotation on a common axis with the cylinder and has fingers which engage yarn.
  • a motor rotates the I yarn 'guide between a position in which the yarn is engaged by the cylinder and fed to the knitting machine and a position in which the yarn is disengaged from the cylinder.
  • the present invention relates to yarn feeders for knitting machines.
  • a control device comprising a double lever one of whose ends carries an eye through which the yarn passes and whose other end acts on a yarn guide so that the lever rotates about its axis in such a manner as to wind more of the yarn on the feed cylinder of the yarn feeder or to disengage a certain amount of yarn from the feed cylinder as a function of the yarn tension between the yarn feeder and the knitting machine, in order to keep the tension of the yarn delivered to the needles constant.
  • Such a yarn feeder from its design, does not lend itself to a rapid removal and threading of the yarn on to the yarn feeder.
  • two rotatable yarn guides are associated with a feed cylinder.
  • Each of the pivotable yarn guides is mounted so as to rotate about a pivot parallel to the axis of the cylinderand is placed close to this axis.
  • the yarn can be placed in contact with a little more of the half of the periphery of the feed cylinder.
  • at least the output end yarn guide located between the cylinder and the knitting machine introduces a stray tension in the yarn, with the result that faults or irregularities appear in the loops of the knitted fabric.
  • Knitting on seamless stocking machines or on ribbedtop plain fabric machines generally involves the production of articles or of plain fabrics having predetermined dimensions. It is therefore important for all the articles or all the plain fabrics in a batch to have the same dimensions irrespective of the yarn used, the color of the yarn and the knitting machines used in order to facilitate matching. It is therefore necessary for the products obtained to display the same characteristics from the point of view of their dimensions. For this purpose it is necessary that the length of yarn taken by the knitting machine to form each loop is controlled especially during the knitting of, for example, the leg part of stockings.
  • the present invention has as its object the remedying of the above disadvantages and the providing of a yarn feeder for at least one yarn and which allows a constant quantity of chosen yarn to be fed to each needle at a given instant under constant tension and to stop or restart delivery of yarn without having to stop the rotation of the yarn feeder and without introducing stray tensions in the yarn between the knitting machine and the yarn feeder during these'operations.
  • a yarn feeder for a knitting machine, of the type comprising at least one feed cylinder coated by a friction layer intended to come into contact with at least one yarn; a motor connected to the feed cylinder and imparting to this latter a continuous movement of rotation about its axis; a pivotable yarn guide mounted idly on the axis of rotation of the feed cylinder and arranged on the side of this cylinder so as to be able to pivot about this axis independently of the rotation of said cylinder, said pivotable yarn guide comprising at the end opposite that mounted on the axis of the feed cylinder two fingers between which the yarn passes, said fingers being parallel with the axis of the feed cylinder and located above and opposite the envelope of the feed cylinder; a fractional horse-power motor capable of rotating in the two directions of rotation and cooperating with the yarn guide so as to cause it to pivot between two extreme positions about the feed cylinder in order to apply the yarn to the feed cylinder or to bring it out of contact with this latter, the kine
  • FIG. 1 is a schematic representation of the knitting machine equipped with a yarn feeder according to the present invention
  • FIG. 2 is a side view of the yarn feeder shown in FIG. 1, with the yarn in the disengaged position,
  • FIG. 3 is a side view of the yarn feeder shown in FIG. 1, with the yarn in the engaged position,
  • FIG. 4 is a side view of another yarn feeder according to the present invention, with the yarn in the disengaged position,
  • FIG. 5 is a view similar to that of FIG. 4 with the yarn in the engaged position
  • FIG. 6 is a front view of an axially elongated yarn feeder for a plurality of yarns
  • FIG. 7 is a plan view of the yarn feeder shown in FIG.
  • the knitting machine is made up of a cylinder 1 equipped with a plurality of latch needles 2 and set in rotation by a motor (not shown) via the intermediary of a toothed gear 3.
  • a variable speed device 4 driven by a motor (not shown), is provided with an output shaft 5 that normally rotates continually at a constant speed and is rigidly connected with a drive shaft 6a of a feeder 6 having a frame or cylinder 6b covered with a layer having a high coefficient of friction.
  • An electric fractional horse-power motor 7 capable of rotation in either direction rotates a pivotable yarn guide 8 rigidly connected to a reducing gear mechanism 9 consisting of two gears 9a and 9b, the latter being mounted idly on the drive shaft 6a of the feeder 6 and supporting the pivotable yarn guide 8.
  • the gears 9a and 9b comprise two toothed wheels 9a and 9b cooperating with one another.
  • the toothed wheel 9a is splined to the driven shaft of the motor 7 whilst the toothed wheel 9b is mounted to rotate freely on the axis or drive shaft 6a of the feed cylinder 6b.
  • the yarn guide 8 is rigidly fixed to a side face of the toothed wheel 9b, this side being adjacent to the feed cylinder 6b.
  • Yarn 12 from a bobbin passes over two fixed yarn guides 10a, 10b
  • the two fingers 11 of the pivotable yarn guide 8 are provided at the end opposite that mounted on the shaft or axis 6a of the feed cylinder 6b, said fingers being parallel with the axis 6a of the feed cylinder 6b and located above and opposite the envelope of the feed cylinder.
  • the fingers 1 1 define an orifice which receives the yarn 12.
  • the two fixed yarn guides a, 10b are disposed upstream and downstream of the yarn feeder 6 so as to define a horizontal level or plane above and outside feed cylinder.
  • the pivotable yarn guide or guides 8 occupies (occupy) its (their) upper extreme position in which the yam- 12 is disengaged from the corresponding feed cylinder 6b of the yarn' feeder 6, the two fingers 11 of the-pivotable yarn guide 8 are situated on both sides of the level or plane passing through the two fixed yarn guides 10a and 10b.
  • the yarn is applied to the periphery or envelope of the cylinder 6b by a pivoting of the pivotable yarn guide 8 in a sense opposite to the sense of rotation of the cylinder 6b.
  • the motor 7 is for example a well known reversible D-C motor having one induced winding whose polarization element 18. This tension prevents-slip of the elastic yarn on the cylinder 13. However, when the yarn is disengaged from the cylinder 13, because no tension is needed for the next knitting operation, the tension produced by the tensioning element 18 may then be too high to allow the knitting machine to operate satisfactorily.
  • the rotation of the pivotable yarn guide 8 from one end position to the other in one and the other direction of rotation on an arc path of about 180 is limited by one of the two limit switches (not shown) provided in the electrical feed circuit of the motor 7, one or the other switch being actuated manually or by a stop unitary with the yarn guide 8 or one of the kinematic means connection between the yarn guide 8 and the motor 7.
  • the yarn feeder 6 has two cylinders 13 and 14 which are mounted in series on two shafts 13a, 14a respectively.
  • On each shaft 13a, 14a is mounted to rotate freely the toothed wheel 9b to which the pivotable yarn guide 8 is fixed rigidly, the cylinder 14 preferably having a diameter that is smaller than that of cylinder 13 but set to rotate at the same angular speed.
  • Either or both of the drive shafts 13a, 14a of the cylinders 13 or 14 are connected to the variable speed device 4.
  • the fractional horse power motor 7 controls the reducing gear mechanism 9 which pivots the gear 9b of the pivotable yarn guide 8 in a direction opposite to the direction of rotation of the feed cylinder 6b or feed cylinders 13, 14 and moves the yarn guide 8 into a position in which the yarn is wound in a large arc on to the cylinder 6b or the cylinders 13, 14 before being fed to the needles 2.
  • the disengaging of the yarn 12 from feed cylinder 6b is controlled in like manner by the fractional horse power motor 7 which then turns in the reverse sense causing the pivotable yam guide 8 to return to its upper end position shown in FIGS. 2 and 4.
  • each engaging or disengaging of the yarn 12 by the continuously rotating yarn feeder 6 is preceded or followed by a short period of working of the yarn without the aid of the yarn feeder 6.
  • the tension in the yarn 12, which is imparted by a tensioning element 18 which maybe of any known type and which may be located on the input side, i.e., upstream of yarn feeder 6, is of small value for example is about 1 gm. for 15-denier 6-6 nylon monofil yarn.
  • the functioning of the two-cylinder yarn feeder of FIGS.4 and 5 is identical to that described with regard to the yarn feeder of FIGS. 1 to 3, except that the pivotable yarn guide 8 of cylinder 14 is operated a short period after or before the operation of the pivotable yarn guide 8 of cylinder 13, following which the yarn of the yarn feeder is engaged or disengaged.
  • the yarn will pass in the same way over the two cylinders, each yarn being guided successively by the pivotable yarn guide 8 of cylinder 14 and by the pivotable yarn guide 8 of cylinder 13, each pivotable yarn guide being mounted to rotate freely on the shaft of the respective cylinder and capable of being actuated by an associated fractional horse power motor in the same manner as the yarn guide 8 of FIGS. 1 to 3.
  • each of the yarns fed to each cam block for forming the various parts of the stocking such as leg and foot passes over the same yarn feeder 6 and in the above-described manner. This is accomplished by simply axially elongating the feed cylinder 6b as well as the two fingers 11 of the yarn guide 8 and to provide, upstream and downstream of the cylinder 6b a corresponding number of tensioning elements 18 and of fixed yarn guides 10a on the one hand, and of fixed yarn guides 10b on the other hand as shown in FIGS. 6 and 7.
  • a yarn feeder 6 comprising two feed cylinders 13 and 14 and a pivotable yarn guide 8 on the driving shaft of each cylinder 13 and 14, it is also advantageous, but not absolutely necessary, to provide between the upstream side of the feed cylinder 14 and the tensioning elements 18 a corresponding number of fixed yarn guides 10a.
  • the functioning of the yarn feeder of FIGS. 6 and 7 is identical to that described with regard to the yarn feeder of FIGS. 1 to 3, except that in this case it applies to or disengages from the feed cylinder simultaneously a plurality of yarns.
  • Yarn feeder for a knitting machine comprising at least one feed cylinder coated by a friction layer intended to come into contact with at least one yarn; a motor connected to the feed cylinder and imparting to this latter a continuous movement of rotation about its axis; a pivotable yarn guide mounted idly on the axis of rotation of the feed cylinder and arranged on the side of this cylinder so as to be able to pivot about this axis independently of the rotation of said cylinder, said pivotable yarn guide comprising at the end opposite that mounted on the axis of the feed cylinder two fingers between which the yarn passes, said fingers being parallel with the axis of the feed cylinder and located above and opposite the envelope of the feed cylinder; a fractional horse power motor capable of rotating in the two directions of rotation and cooperating with the yarn guide so as to cause it to pivot between two extreme positions about the feed cylinder in order to apply the yarn to the feed cylinder or to bring it out of contact with this latter, the kinematic connection between the fractional horse-powermotor and
  • Yarn feeder according to claim 1 comprising in addition to the first feed cylinder, its drive motor, its mobile yarn guide and the fractional horse-power motor for said yarn guide, a second feed cylinder arranged parallel to the axis of the first feed cylinder between the input side of the latter and the output side of the tensioning element, and associated in the same manner as the first feed cylinder with a drive motor, with a drive motor, with a second pivotable yarn guide d wi a fractio al h sewer motor coo eratin ll th sai second p ivota le y n guide for said secong feed cylinder, the yarn passing through the two yarn guides.
  • Yarn feeder according to claim 1 in which a second fixed yarn guide is arranged near the downstream side of the yarn tensioning element and in the same plane defined by this latter and the first fixed yarn guide.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US121440A 1968-05-08 1971-03-05 Yarn feeder for a knitting machine Expired - Lifetime US3700153A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR150975 1968-05-08

Publications (1)

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US3700153A true US3700153A (en) 1972-10-24

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US121440A Expired - Lifetime US3700153A (en) 1968-05-08 1971-03-05 Yarn feeder for a knitting machine

Country Status (9)

Country Link
US (1) US3700153A (fr)
BE (1) BE732617A (fr)
CH (1) CH508757A (fr)
CS (1) CS151512B2 (fr)
DE (1) DE1922342C3 (fr)
ES (1) ES366767A1 (fr)
FR (1) FR1574144A (fr)
GB (1) GB1215426A (fr)
NL (1) NL6906541A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4026127A (en) * 1976-01-02 1977-05-31 Mccreary Marcus C Roll feed for circular knitting machine
US4441664A (en) * 1982-07-26 1984-04-10 Anderson Bros. Mfg. Co. Apparatus for feeding web material from a supply roll
US5423197A (en) * 1991-09-26 1995-06-13 Roser; Erich Yarn-delivery device for yarn-consuming textile machines
US6105398A (en) * 1998-03-26 2000-08-22 Memminger-Iro Gmbh Positive feed mechanism for elastic yarns
US6193184B1 (en) * 1996-11-01 2001-02-27 Tetra Pak Hoyer A/S Method and a system for controlling tension of paper and foil webs

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD136861B1 (de) * 1978-06-02 1981-08-26 Wirkmaschinenbau Karl Marx Veb Vorrichtung zur zufuehrung von faeden an textilmaschinen
DE3332146A1 (de) * 1982-09-14 1984-03-15 Courtaulds Plc, London Garnzufuehrungseinrichtung fuer eine strickmaschine
GB8804927D0 (en) * 1988-03-02 1988-03-30 Cobble Blackburn Ltd Improvements in/relating to tufting machinery
DE19546404A1 (de) * 1995-12-12 1997-06-19 Terrot Strickmaschinen Gmbh Fadenliefervorrichtung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2917914A (en) * 1955-09-19 1959-12-22 Shortland Arthur Yarn feeding means for knitting machines
GB934764A (en) * 1957-09-05 1963-08-21 Morat Franz Improvements relating to thread-delivery arrangements
GB942347A (en) * 1961-08-17 1963-11-20 Wildt Mellor Bromley Ltd Improvements in yarn feeding and controlling mechanism in multi-feeder circular knitting machines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2917914A (en) * 1955-09-19 1959-12-22 Shortland Arthur Yarn feeding means for knitting machines
GB934764A (en) * 1957-09-05 1963-08-21 Morat Franz Improvements relating to thread-delivery arrangements
GB942347A (en) * 1961-08-17 1963-11-20 Wildt Mellor Bromley Ltd Improvements in yarn feeding and controlling mechanism in multi-feeder circular knitting machines

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4026127A (en) * 1976-01-02 1977-05-31 Mccreary Marcus C Roll feed for circular knitting machine
US4441664A (en) * 1982-07-26 1984-04-10 Anderson Bros. Mfg. Co. Apparatus for feeding web material from a supply roll
US5423197A (en) * 1991-09-26 1995-06-13 Roser; Erich Yarn-delivery device for yarn-consuming textile machines
US6193184B1 (en) * 1996-11-01 2001-02-27 Tetra Pak Hoyer A/S Method and a system for controlling tension of paper and foil webs
US6105398A (en) * 1998-03-26 2000-08-22 Memminger-Iro Gmbh Positive feed mechanism for elastic yarns

Also Published As

Publication number Publication date
GB1215426A (en) 1970-12-09
BE732617A (fr) 1969-10-16
DE1922342C3 (de) 1978-10-19
ES366767A1 (es) 1971-03-16
DE1922342B2 (de) 1978-02-23
FR1574144A (fr) 1969-07-11
NL6906541A (fr) 1969-11-11
CH508757A (fr) 1971-06-15
DE1922342A1 (de) 1970-04-23
CS151512B2 (fr) 1973-10-19

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