EP0481803A1 - Dispositif d'alimentation en fil - Google Patents

Dispositif d'alimentation en fil Download PDF

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Publication number
EP0481803A1
EP0481803A1 EP91309619A EP91309619A EP0481803A1 EP 0481803 A1 EP0481803 A1 EP 0481803A1 EP 91309619 A EP91309619 A EP 91309619A EP 91309619 A EP91309619 A EP 91309619A EP 0481803 A1 EP0481803 A1 EP 0481803A1
Authority
EP
European Patent Office
Prior art keywords
yarn
wheel
tension
feed device
rubber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP91309619A
Other languages
German (de)
English (en)
Inventor
Derek William Plucknett
David John Lucas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TRIP-LITE Ltd
Triplite Ltd
Original Assignee
TRIP-LITE Ltd
Triplite Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TRIP-LITE Ltd, Triplite Ltd filed Critical TRIP-LITE Ltd
Publication of EP0481803A1 publication Critical patent/EP0481803A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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

  • the invention relates to the delivery of yarn to textile machines, especially double cylinder or single cylinder circular knitting sock machines, at a constant desired tension and at a feed rate, which may be intermittent or highly variable, dictated by the demand of yarn by the machine.
  • Double cylinder or single cylinder sock knitting machines tend to have extreme variations in their demand for yarn, as they can be configured to vary the pattern of any knitted structure down the length of the sock, to change colours by placing yarn feeds into and out of action (known as ′striping′) and to enter a reciprocatory mode of cylinder movement for the fashioning of toes and heels.
  • Many yarn feed devices have been proposed to cater for this wide variation. None, however, is sufficiently flexible to cater for all machine demand variations and all yarn types.
  • Truly positive feed devices which deliver a precisely measured length of yarn at constant tension to each machine needle, cannot cope with the intermittent and widely varying yarn demands of the knitting machine during the course of knitting a sock.
  • Various yarn assist devices have therefore been proposed, some of which can be converted readily into positive feed or virtual positive feed mode.
  • Such a yarn feed device is, however, quite unsuitable for use with a sock machine because when the yarn is passed for a number of turns around the rubber covered part of the whell it experiences substantially positive feed, so that it is necessary to rotate the feed whell in very precise synchronism with the rotation of the knitting machine. That degree of synchronism is simply not possible in the case of a sock machine which, at different stages in the knitting cycle, enters a reciprocatory phase of cylinder movement for fashioning of the toe and heel.
  • the invention provides a simple and inexpensive yarn feed device which does not provide positive feed but which does assist the forward motion of the yarn from a bobbin for delivery to a knitting machine at the rate demanded by that knitting machine.
  • the device is well able to cope with the wide and intermittent variation in the yarn demand by double or single cylinder sock machines, to cope with a very wide variety of yarns with substantially different yarn handling cbaracteristics, and to deliver the yarns to the knitting machine at highly uniform delivery tensions.
  • the invention comprises a yarn feed device for textile machinery, comprising a feed whell drivable by an electric motor to rotate at a peripheral speed in excess of the maximum anticipated rate of demand for yarn by the textile machinery, yarn tension devices located on infeed and outfeed sides of the whell to define a yarn path in which the yarn passes around the whell for an arc of less than 360° in frictional contact with the wheel; and a yarn tension-responsive shipping lever for guiding the yarn between the tension device on the yarn infeed side and the wheel, the shipping lever being movable against the bias of a spring by tension in the length of yarn which it guides, from a non-yarn-assist position in which it directs the yarn onto a low friction axial zone of the whell, to a yarn-assist position in which it directs the yarn onto a higher friction axial zone on the whell, wherein demand for yarn by the textile machinery results in movement of the shipping lever to its yarn-assist position, resulting in frictional feeding of the yarn to the textile machinery at a rate
  • the yarn tension devices are preferably associated with yarn guide eyes which define precisely the yarn path in which the yarn passes around the whell.
  • the yarn is preferably in frictional contact with the wheel for an arc of substantially 270°, although the optimum choice of angle will be dependent on the frictional characteristics of the relatively low friction and relatively high friction axial zones of the whell.
  • the shipping lever is preferably a simple sprung biased lever, normally biased under the tension of a light spring to a position in which yarn passing from the infeed yarn tension device to the whell is deflected axially to contact the lower friction axial zone of the whell.
  • the yarn outfeed tension device is preferably positioned approximately in line with the function between the axial zones on the whell, so that if the yarn is laid onto the whell on the lower friction axial zone, it will travel around the wheel in that same zone before being withdrawn. Conversely if it is laid onto the whell on the higher friction axial zone, then it will remain in contact with the higher friction surface of the whell until it is withdrawn.
  • the shipping lever should be positioned so that any tension in the yarn passing from the yarn tension device on the infeed side of the whell to the whell induces a lateral movement of the shipping lever against the force of its spring, so that the yarn is laid on the appropriate higher friction axial zone of the whell.
  • An appropriate yarn tension in that particular length of the yarn path need not be substantial, and would be induced by a demand for the yarn by the textile machinery.
  • the yarn infeed and outfeed tension devices are preferably adjustable to vary the yarn tension. It has been found essential that two such tension devices are necessary for certain yarns if the device is to work effectively.
  • the yarn feed device of the invention is able to accommodate a very wide range of yarn demand speeds over a surprisingly high range of outfeed tensions. Moreover the device of the invention can be modified to accommodate a wide range of yarn types, even covering elastomeric yarns which are notoriously difficult to handle.
  • the relatively low friction axial zone of the whell is preferably a smooth metallic surface, with the relatively high friction axial zone being provided by a rubber cladding over the whell.
  • the rubber cladding may be removable and replaceable, and replacement of the rubber cladding by a cladding having a different frictional and yarn handling characteristic enables the suitability of the yarn feed device of the invention to be extended over the entire range of yarn types.
  • a smooth surfaced rubber cladding is very suitable for natural and covered elastomeric yarns, whereas a textured surface might be more appropriate for some synthetic yarns.
  • a rubber cladding formed with axial ribs lying along its external periphery is particularly suitable for use with continuous filament synthetic yarns, and preferably the ribs have tapered or rounded ends on the side of the cladding forming a junction with the low friction axial zone of the whell. This tapering or rounding facilitates rapid movement of the yarn onto and off the higher friction clad portion of the wheel in response to movement of the yarn shipping lever.
  • the yarn may move axially along the wheel when the demand ceases.
  • the precise positioning of the yarn infeed eye carried by the yarn shipping lever, and the yarn outfeed eye leading to the yarn outfeed tension device, do much to resist that movement, but preferably the direction of rotation of the feed whell is such that where the above tendency exists, the yarn is urged to move in a direction away from the lower friction uncovered part of the whell.
  • the position of the higher friction rubber cladding is preferably reversible on the whell, and the position and bias of the yarn shipping lever is preferably similarly reversible, or may be duplicated, to accommodate a reversal of the relative positions of the high friction and low friction parts of the whell.
  • the yarn feed device of the invention lends itself particularly well to the ganging of a number of similar yarn feed wheels, each with its associated infeed and outfeed yarn tension devices and its associated tension-responsive shipping lever, on a common drive shaft of the same electric motor, for driving the whells at the same peripheral speed.
  • a remarkable characteristic of a ganged yarn feed device of this kind is that it can successfully feed two separate yarns at the same time to a single yarn feeder of the knitting machine with which it is used.
  • the two separate yarns, drawn from separate yarn packages pass through different infeed and outfeed yarn tension devices and over different feed wheels but are then delivered to the same yarn feeder of a knitting machine. It has been found that even yarns with substantially different yarn handling characteristics can be simultaneously delivered in this manner at substantially constant and independently controllable yarn tensions.
  • FIGS 1 and 2 illustrate a first embodiment of a feed wheel according to the invention.
  • a constant speed electric motor 1 drives a yarn feed wheel 2 at a peripheral speed from 10% to 50% in excess of the maximum rated demand rate of yarn from an associated knitting machine (not shown).
  • the feed whell 2 is covered over half of its axial length with a thin cladding 3 of rubber material, the other half 4 of the axial length of the wheel 2 being left uncovered.
  • the frictional characteristics of the covered and uncovered portions 3 and 4 of the wheel are such that the rubber covered portion 3 has a relatively high frictional characteristic as compared with the uncovered portion 4 which is simply a smooth polished metal surface of the wheel 2.
  • a yarn shipping lever 5 is pivotally mounted at 6 and lightly biased by spring means (not shown) to the position shown in Figure 1.
  • the angular movement of the shipping lever 5 is illustrated by the double-headed arrow 7, from which it will be seen that the lever can be moved from the position illustrated in which it feeds yarn to the uncovered half 4 of the whell to a position in which it feeds the yarn to the rubber covered half 3 of the wheel.
  • Angular movement of the shipping lever 5 is under the control of yarn tension, and in particular the tension between a yarn infeed tension device 8 and the guide eyelet 9 of the shipping lever 5.
  • the yarn path is shown as a chain-dotted line in the drawings.
  • the yarn infeed tension device 8 comprises a pair of yarn guide eyes 10 between which is a pair of conventional yarn tensioning spring loaded cymbals 11. As is well-known in the art, a thumbscrew 12 is provided for manually varying the tension to be transmitted to the yarn by the cymbals 11. A similar yarn tensioning device 13 is provided at the yarn outfeed side of the feed whell 2, and in practice the yarn tensioning device 13 is operated at the lower tension.
  • Figure 1 illustrates the yarn path in developed view, and reference must be made to Figure 2 to perceive how the yarn passes around the whell 2 for substantially 270°.
  • Figure 2 Also illustrated in Figure 2 is the latch blade 14 of a stopmotion device (not shown) for detecting when the yarn becomes wrapped around the whell 2, giving rise to potential breakages. Normally the yarn will be withdrawn from the whell 2 towards the knitting machine in the direction of the double headed arrow 15, following the path shown in obain-dotted lines. However when the demand for yarn ceases, and particularly if the yarn infeed tensioning device 8 is set at a low tension, the yarn can cling to the rotating wheel 2 and be carried round towards the blade 14.
  • the space between the blade 14 and the surface 3 of the wheel 2 is set to be extremely small, so that build-up yarn carried round on the whell causes the blade 14 to be lifted, which unlatches the blade and causes it to trip to a position actuating the stopmotion assembly.
  • Figure 3 illustrates both a four-ganged arrangement of yarn feed whells on the drive shaft of a single electric motor, and the preferred use of a ribbed rubber cladding for the whell when the device is intended for use with certain fine synthetic yarns.
  • Figure 3 corresponds to that of Figure 1, and a similar range of reference numerals has been used in Figure 3 but increased by 100.
  • a single electric motor 101 drives four feed wheels 102, 102′, 102 ⁇ and 102 ⁇ ′.
  • Each feed wheel is associated with its own yarn shipping lever 105 and its own yarn infeed and yarn outfeed tensioning devices 108 and 113.
  • the four yarn shipping levers 105 to 105′′′ are shown as being pivotally mounted on a cover sheet 120 which extends as a shield over all four feed wheels 102 to 102′′′ and serves to prevent the rotating wheels being fouled either by an operator's fingers or by loose ends of yarn falling from the yarn bobbins which are located above the yarn feed device.
  • Figure 3 shows how different rubber claddings can be used for different yarns.
  • the rubber cladding 104′′′ is smooth and untextured, and is suitable for natural fibre and covered elastomeric yarns.
  • the rubber cladding 104′′ is provided around its outer periphery with a series of axial outstanding ribs 121 which provide a better yarn assist characteristic for synthetic nonofilament yarns.
  • the nose portion of each rib 121 is tapered (or may be rounded) in the direction of the uncovered half 103′′ of the associated wheel, which has been found to provide very rapid transfer of the yarn onto and off the rubber covered portion 104′′ of the whell in response to movement of the shipping lever 105′′.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
EP91309619A 1990-10-18 1991-10-17 Dispositif d'alimentation en fil Withdrawn EP0481803A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9022615 1990-10-18
GB909022615A GB9022615D0 (en) 1990-10-18 1990-10-18 Yarn feed device

Publications (1)

Publication Number Publication Date
EP0481803A1 true EP0481803A1 (fr) 1992-04-22

Family

ID=10683906

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91309619A Withdrawn EP0481803A1 (fr) 1990-10-18 1991-10-17 Dispositif d'alimentation en fil

Country Status (4)

Country Link
EP (1) EP0481803A1 (fr)
JP (1) JPH04263656A (fr)
CN (1) CN1062561A (fr)
GB (1) GB9022615D0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2297331A (en) * 1995-01-24 1996-07-31 Cobble Blackburn Ltd Yarn feed arrangement for tufting machine
EP2998255A1 (fr) * 2014-09-10 2016-03-23 Murata Machinery, Ltd. Dispositif de stockage de fil et dispositif de bobinage de fil équipé d'un dispositif de stockage de fil

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101448988B (zh) * 2006-05-31 2013-05-01 梅明格-Iro股份有限公司 具有可移动的进纱环的积极式导纱装置
JP5615721B2 (ja) * 2011-01-05 2014-10-29 Ｔｍｔマシナリー株式会社 繊維機械及び繊維機械の糸巻き取り方法
DE102011053824B3 (de) * 2011-09-21 2012-10-04 Memminger-Iro Gmbh Fadenliefergerät zur Zufuhr eines Fadens zu einer Textilmaschine
CN111350023B (zh) * 2020-04-24 2021-12-03 宁夏灵智科技有限公司 一种新型针织设备纺线张力的拉紧装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1133959A (fr) * 1954-06-18 1957-04-04 Stibbe G & Co Ltd Perfectionnements apportés aux dispositifs d'alimentation de fil des machines à tricoter
US2949756A (en) * 1957-05-08 1960-08-23 Scott & Williams Inc Yarn furnisher for knitting machines
FR1241501A (fr) * 1959-11-24 1960-09-16 Procédé pour l'alimentation en fil des métiers de bonneterie et dispositif fournisseur de fil pour la mise en oeuvre de ce procédé ou procédé similaire
BE720732A (fr) * 1967-09-13 1969-03-12
FR2141482A1 (en) * 1971-06-03 1973-01-26 Inst Textile De France Knitting machine yarn feed device - using high friction drive roller around which yarn passes
GB2065723A (en) * 1979-12-11 1981-07-01 Stevcoknit Inc Self actuating yarn feed and drive belt arrangement for circular knitting machines

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1133959A (fr) * 1954-06-18 1957-04-04 Stibbe G & Co Ltd Perfectionnements apportés aux dispositifs d'alimentation de fil des machines à tricoter
US2949756A (en) * 1957-05-08 1960-08-23 Scott & Williams Inc Yarn furnisher for knitting machines
FR1241501A (fr) * 1959-11-24 1960-09-16 Procédé pour l'alimentation en fil des métiers de bonneterie et dispositif fournisseur de fil pour la mise en oeuvre de ce procédé ou procédé similaire
BE720732A (fr) * 1967-09-13 1969-03-12
FR2141482A1 (en) * 1971-06-03 1973-01-26 Inst Textile De France Knitting machine yarn feed device - using high friction drive roller around which yarn passes
GB2065723A (en) * 1979-12-11 1981-07-01 Stevcoknit Inc Self actuating yarn feed and drive belt arrangement for circular knitting machines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2297331A (en) * 1995-01-24 1996-07-31 Cobble Blackburn Ltd Yarn feed arrangement for tufting machine
EP2998255A1 (fr) * 2014-09-10 2016-03-23 Murata Machinery, Ltd. Dispositif de stockage de fil et dispositif de bobinage de fil équipé d'un dispositif de stockage de fil

Also Published As

Publication number Publication date
CN1062561A (zh) 1992-07-08
JPH04263656A (ja) 1992-09-18
GB9022615D0 (en) 1990-11-28

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