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WO1992007129A1 - Machine a tricoter et element de cette machine - Google Patents

Machine a tricoter et element de cette machine Download PDF

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Publication number
WO1992007129A1
WO1992007129A1 PCT/GB1991/001817 GB9101817W WO9207129A1 WO 1992007129 A1 WO1992007129 A1 WO 1992007129A1 GB 9101817 W GB9101817 W GB 9101817W WO 9207129 A1 WO9207129 A1 WO 9207129A1
Authority
WO
WIPO (PCT)
Prior art keywords
yarn
feed carrier
spring
yarn feed
carrier
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.)
Ceased
Application number
PCT/GB1991/001817
Other languages
English (en)
Inventor
Keith Jeffcoat
Dennis John Williams
Gerald Francis Day
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.)
Akzo Nobel UK PLC
Original Assignee
Courtaulds PLC
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 Courtaulds PLC filed Critical Courtaulds PLC
Publication of WO1992007129A1 publication Critical patent/WO1992007129A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • D04B15/54—Thread guides
    • D04B15/56—Thread guides for flat-bed knitting machines

Definitions

  • This invention relates to knitting machines and has particular reference to components associated with the control of yarn in a knitting machine.
  • Knitting machine technology is a highly developed art- Weft knitting machines, particularly flat bed weft knitting machines, have been in production in excess of 100 years.
  • a particularly important form of weft knitting machine is the flat V-bed knitting machine.
  • a flat V-bed knitting machine is made up of 2 flat rows of needle guides. The needle guides or tricks are assembled in beds and are inclined at an angle of typically 110" one to the other. Such flat V-bed knitting machines are well known.
  • a knitting head often referred to as a cam box, is reciprocated over the flat V-beds to operate the needles in sequence to effect knitting. Yarn is fed to the knitting head to permit knitting to continue.
  • each yarn carrier may be located on a separate rail positioned above the flat beds of the knitting machine.
  • Each yarn carrier is provided with a separate yarn and at the end of the bed from whence the yarn is supplied there is provided means to maintain a tension in the yarn.
  • the means to maintain the tension normally comprises a spring-loaded thin wire arm looking rather like a small fishing rod having a ceramic guide at its free end and able to swing backwards and forwards to maintain the yarn under tension.
  • a weft knitting machine having a needle bed and incorporating a movable yarn feed carrier reciprocal along the length of the bed to supply yarn to the needles being knitted, there being provided on or adjacent the yarn carrier and reciprocal with the yarn carrier means to maintain a tension in the yarn.
  • the present invention also provides a yarn feed carrier for a flat bed knitting machine, the yarn feed carrier being
  • the yarn feed carrier incorporating means to take-up slack in the yarn.
  • the present invention also provides a weft knitting machine including a knitting head which is reciprocal on a needle bed to activate needles mounted in the bed, the knitting head incorporating or having associated therewith a yarn feed carrier, the yarn feed carrier incorporating means to take-up slack in the yarn.
  • the knitting machine may comprise a flat V-bed knitting machine.
  • the yarn feed carrier may be integral with a knitting head which is reciprocal on the needle bed to effect knitting.
  • the yarn feed carrier may be mounted on a rail lying parallel to the direction of movement of the knitting head and may be selectively moveable with the knitting head.
  • There may be a plurality of yarn feed carriers, each mounted independently on the rail or a plurality of rails, and each selectively moveable with the knitting head.
  • the yarn may be fed to the yarn feed carrier from a location adjacent the end of the needle bed.
  • the location may incorporate further means to maintain tension in the yarn.
  • the further means may comprise a resilient movable member.
  • the resilient moveable member may be a spring loaded wire.
  • There may be a ceramic eyelet at the moveable end of the wire through which the yarn is fed.
  • the means to take-up the slack on the yarn feed carrier may comprise a resiliently moveable member displaced by the action of the yarn feeding through the member, and able to recover the yarn when the yarn feeding is terminated.
  • the resiliently moveable member may be a spring located at one end on or adjacent the yarn feed carrier and having a yarn guide at the other end.
  • the spring may be a coil spring or a leaf spring or may be a resilient rod of a resilient material such as a plastics material such as neoprene or a
  • the resilient moveable member may be a pulley rotatable by the yarn in frictional engagement with the periphery of the pulley to wind up a spring and subsequently permit the yarn to feed over the surface of the pulley until the yarn tension subsides to a level such that the pulley is rotated to take up the slack in the yarn by unwinding of the spring.
  • the means to take-up the slack may comprise an arm carrying a magnet, the arm being pivoted at one end and carrying a yarn guide at the other, there being a magnet fixed on or adjacent the yarn feed carrier so positioned relative to the arm magnet that one at least of identical poles on both magnets face each other so as to repel each other and bias the arm away from the magnet on the yarn feed carrier, the action of the yarn feeding through the yarn guide moving the repelling poles of the magnets towards one another.
  • taking-up the slack in the yarn at the yarn feed carrier normally involves applying a tension to the yarn after this slack has been taken up. It is, however, possible that the yarn slack may be taken up without applying significant tension to the yarn and the present invention envisages such a device.
  • the most convenient mechanism for operating the present invention may comprise the combination of yarn feed take-up mechanisms located on the yarn feed carrier itself together with further means to take-up yarn slack and/or provide tension at the ends of the flat beds.
  • Figure 1 is a schematic view of a flat V-bed knitting machine
  • Figure 2 is a perspective view of a part of a flat V- bed knitting machine incorporating yarn carrier rails
  • Figure 3 is an end view of a machine similar to that of Figure 2 but incorporating three rails,
  • Figure 4 is a front general view of a prior art yarn feed carrier
  • Figure 5 is a view of the carrier of Figure 4 along the line of arrow V,
  • Figure 6 shows a modified yarn carrier in accordance with the present invention
  • Figure 7 shows an enlarged view of the assembly of Figure 6 with the yarn carrier in tension
  • Figure 8 shows an enlarged alternative structure for a yarn carrier in accordance with the present invention
  • Figure 9 shows an alternative form of yarn carrier in accordance with the present invention.
  • Figures 10 to 13 show enlarged views of the tensioning device of Figure 9.
  • FIG. 1 shows in schematic form a general arrangement of a flat V-bed knitting machine.
  • a pair of beds 1,2 are arranged in a frame angled at an angle
  • Each bed 1,2 is made up of a
  • a knitting head or cam box generally indicated by 4 reciprocates along the beds 1,2 in the direction of arrows 5,6. As the knitting head 4 is reciprocated, cams lift up the needles in the tricks to effect the knitting in a manner well know per se.
  • the yarn to be knitted is fed to the knitting head from a yarn package 7 via a guide 8 and a tensioning means indicated generally by 9.
  • the yarn 10 is maintained in tension by a spring-loaded wire arm 11 having a ceramic guide 12 at its end, which forms the assembly 9.
  • the guide 8 may in fact comprise a motor driven mechanism to feed yarn to the knitting machine at the appropriate rate. It will be appreciated that the function of the tensioning device 9 is to maintain the yarn 10 in tension at such times as the knitting head 4 stops moving in the direction of arrow 5 and reverses to move in the direction of arrow 6.
  • the machine illustrated in Figure 1 is capable of knitting with only one yarn, and in commercial practice such machines are a relatively minor part of the large knitting machine business. More typically such a knitting machine would be used to knit with a plurality of yarns. Illustrated in Figure 2 and 3 are flat V-bed structures incorporating rails for a plurality of yarn feed carriers. As can be seen in Figure 2 the beds 13,14 have located above them a series of rails 15,16. The number of rails provided dictates the number of yarns which can be knitted on the machine. It can be seen from Figure 2 that the machine is provided with two rails. In the machine illustrated schematically in Figure 3, three rails 17,18,19 are provided above the flat beds 20, 21. Running on each of the rails is a yarn feed carrier indicated generally by 22 in Figure 4.
  • a rail engaging block 23 which is provided with inwardly directed lips 24,25 ( Figure 5) which engages with one of the rails such as rail 16.
  • the block 23 would typically be formed of a carbon fibre filled plastics material so as to have high strength but low mass.
  • a yarn feeder arm Secured to the block 23 by means of screws 26 is a yarn feeder arm generally indicated by 27.
  • the arm 27 does not depend vertically from the block 23 but is inclined so that its tip 28 is not below the centre line of the block 23.
  • the tips of adjacent yarn feed carriers are designed to rub against one another as they pass each other.
  • the rails 17,18,19 are in spaced parallel relationship and typically the arms 27 would be displaced from the centre line of the block 23 so that each tip lies close to the centre line 29 between the beds 20 and 21.
  • a star guide 30 which is in the form of a circular block having three radially extending walls 31,32,33. Each of the walls is apertured so that thread may pass through the walls for guiding purposes. It will be appreciated that thread can pass through the aperture in wall 31 to pass onwardly to a further yarn carrier guide if the knitting machine is provided with a plurality of knitting heads on a very elongate flat bed. Alternatively the yarn can be fed from either the right hand side or the left hand side as shown in Figure 4 and through apertures in walls 33 and 32 respectively and then down through an aperture 34 in the tip 28 to the needles on the needle beds.
  • the design of the yarn feed carrier shown in Figures 4 and 5 is conventional.
  • FIG. 6 this shows a yarn feed carrier 36 in accordance with the present invention.
  • a feed carrier is shown in conjunction with an external tensioning device similar to that illustrated at 9 in Figure 1.
  • the yarn feed carrier 36 incorporates a mounting block 36a shown mounted on a chain dotted rail 37 and having dependent from it an arm 38.
  • the tip 39 of the arm 38 5 incorporates an aperture in exactly the same way as the arm 27 illustrated in Figures 4 and 5 carries tip 28 with its aperture 34.
  • a star guide 40 is provided on the arm 38 but secured to the star guide 40 but secured to the star guide 40 but secured to the star guide 40 a tubular spring 41 having attached to its free end a ceramic yarn guide 42.
  • the geometry of the 30 assembly illustrated in Figure 7 is such that the length of yarn shown dotted at 50 between points 48 and 39 is less than the length of yarn shown as solid line 51 between points 48 and 39.
  • the knitting head reaches the end of its traverse, such as the end of its traverse in the 35 direction of arrow 5 ( Figure 1) and commences its movement in the opposite direction as shown by arrow 6 ( Figure 1), the yarn which has been held in tension and displaced to the position shown dotted at 50 is able to return to 51 under the action of the spring 41.
  • the provision of the yarn take-up mechanism at the end of the beds means there is increasing delay in the reaction of the yarn take-up mechanism to the stopping of the needle head or to the cessation of knitting on a particular yarn.
  • the individual yarn feed carriers are picked up and dropped by the knitting heads at various times during the knitting sequence.
  • the knitting head would have a mechanism to engage the carrier block, such as block 36, to permit a particular yarn to be knitted, and after knitting had ceased on that yarn, the knitting block would be released by the knitting head and would stop.
  • the yarn feed carriers should be dropped and parked as close to the end of the knitting as possible.
  • the two or more yarn carriers must be longitudinally spaced, otherwise if the yarn carriers are all stopped at the same point, the tips of the yarn carriers would all lie next to each other and in contact with each other in the same transverse plane to the knitting bed.
  • the provision of a take-up mechanism directly on the yarn carrier enables almost instantaneous take-up of yarn to occur.
  • the external take-up mechanism such as mechanism 47b, 47c, 47d ( Figure 6) cannot react instantaneously as there has to be a delay associated with the extension of the thread before the take up mechanism can react.
  • the strength of the take-up spring 47d ( Figure 6) could be increased but this carries with it a risk of over tightening of the stitches immediately below the tip of the carrier when the carrier comes to a halt. If the tension in the spring 47d is reduced to avoid excessive tensioning of the stitches then there is a danger that the yarn take-up mechanism will react too slowly producing excessively large loops and even the possibility of loops of one thread becoming entangled with loops of another thread.
  • a spring 41 of steel spring wire having a wire diameter of 0.42 mm can be wound in 21 pitches to form a steel spring having an external diameter of 5.5 mm and a length of 31.75 mm (rated such that it will extend under a load of 325 gms from 31.75 mm to a total length of 95.25 mm) produces a yarn feed carrier which works very effectively on a automatic flat V-bed knitting machine having a bed length of 2 metres.
  • alternative structures can be used such as a leaf spring or a wire or a solid rod of elastomeric material such as silicone rubber or neoprene. It will further be appreciated that arrangements may be provided in which the guide wall 48 and the spring 41 are formed integrally and either attached to the arm 38 or are formed integrally with the arm 38.
  • SUBSTITUTE SHEET Rather than using spring elements, magnetic means may be provided to produce the tension at the yarn feed carrier. Illustrated in Figure 8 is such a mechanism.
  • a yarn feed carrier arm 52 is provided with a pivoted arm 53 having a ceramic guide 54 at one end and a freely moveable pivot 55 at the other end. Yarn is fed through a further yarn guide 56 mounted on the arm 52 to a tip 57 of the carrier arm 52.
  • a magnet 58 Positioned on the pivoted arm 53 is a magnet 58 which cooperates with a further magnet 59 located directly on the carrier arm 52.
  • the magnets 58 and 59 will repel each other so as to effectively produce a springing effect similar to that illustrated in Figure 7.
  • the greatest repulsion is effected when the magnets 58, 59 get closest to one another and thus the speed of response of the system will be at its greatest when the yarn is trying to be as close to a straight line between points 56 and 57 as possible.
  • the devices illustrated in Figures 6,7 and 8 all provide means for taking up the slack on the yarn on the yarn carrier.
  • a carrier block 60 adapted to move along a rail such as rail 15 or 16 and incorporating a slider cut-out portion 61 to engage the rail.
  • a dependent arm 63 Secured to the back of the block 60 by means of screws 62 is a dependent arm 63 having a hinge member 64 at its lower end.
  • a further arm member 65 Secured to the hinged member 64 is the upper portion of a further arm member 65 carrying a camming passing mechanism in the form of a block 66.
  • Located on the block 66 is a hollow guide tip 67 which is secured to the block 66 via an upstanding arm portion 68 and a screw 69.
  • SUBSTITUTE SHEET Yarn 70 passes to the tip 67 via a yarn take-up device 71.
  • the device 71 can be seen more clearly in Figures 10 to 13. Referring to Figure 10, this shows a spring loaded wheel 72 having a bridge 73 on its front face. At the end of the bridge is an eyelet 74 through which the yarn 70 is passed. The bridge 73 is shown in contact with a stop member 75 in Figure 10.
  • the position of the take-up device in Figure 10 corresponds to that in which the yarn carrier is knitting yarn and it can be seen that the yarn has a smooth path through the eyelet 74, down towards the tip 67 of the carrier.
  • the wheel 72 When the yarn carrier is parked and slack has to be taken up, the wheel 72 is rotated anti-clockwise (as shown in Figures 10 and 11) by an internal spring to carry the bridge 73 and the eyelet 74 to the position shown in Figure 11. It can be seen that in this position the yarn 70 is wrapped partly around the surface of the wheel 72. For reasons of clarity, the yarn 70 is shown spaced from the surface of the wheel 72 in Figure 11, although it will be appreciated that the yarn would actually lie on the surface in use.
  • Figure 12 shows an underneath view of the wheel 72 and it can be seen that the eyelet 74 mounted on the bridge 73 leads the yarn passing through the eyelet directly onto the surface 75 of the wheel 72.
  • Figure 13 which is a cross section of the wheel 72, it can be seen that inside the wheel is a spiral hair-spring 76 which rotates the wheel 75 so that in its rest position it will be as shown in Figure 11.
  • the take-up wheel will adopt the position shown in Figure 11 and under the tension of knitting the take-up wheel is rotated clockwise to provide a smooth path for yarn as is shown in Figure 10.
  • the amount of tension applied by the hair-spring may be varied by winding the hair-spring to a different tension.
  • tensioning means has been shown as being directly on the yarn feed carrier a separate mechanism could be provided adjacent to the yarn feed carrier provided that it moved with the yarn feed carrier so as to provide rapid take-up of slack by the feed carrier rather than relying on the external loop tension system.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)

Abstract

Machine à mailles cueillies comprenant une planche des aiguilles (1, 2) avec un doneur de fil (36) à mouvement alternatif le long de la planche, un tendeur de fil (41, 42) étant aussi prévu sur le donneur de fil pour enrouler le fil (43) lâche lorsque le tricotage est interrompu et commencé.
PCT/GB1991/001817 1990-10-22 1991-10-17 Machine a tricoter et element de cette machine Ceased WO1992007129A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB909022952A GB9022952D0 (en) 1990-10-22 1990-10-22 Knitting machine and component thereof
GB9022952.7 1990-10-22

Publications (1)

Publication Number Publication Date
WO1992007129A1 true WO1992007129A1 (fr) 1992-04-30

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ID=10684156

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Application Number Title Priority Date Filing Date
PCT/GB1991/001817 Ceased WO1992007129A1 (fr) 1990-10-22 1991-10-17 Machine a tricoter et element de cette machine

Country Status (2)

Country Link
GB (1) GB9022952D0 (fr)
WO (1) WO1992007129A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001077427A1 (fr) * 2000-04-06 2001-10-18 University Of Manchester Institute Of Science & Technology Systeme de distribution de longueurs de fil precises

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB223643A (en) * 1923-07-23 1924-10-23 George Hunston Edman Improvements in or relating to knitting machines
US2608844A (en) * 1950-07-21 1952-09-02 Josef S Karl Yarn carrier with takeup device for hosiery machines
DE1585413A1 (de) * 1965-06-25 1970-05-21 Terrot Soehne & Co C Verfahren und Vorrichtung zur Erzielung einer schmalen Schlussstelle bei Rundstrickmaschinen mit Fadenwechslern und Gummifadenlegern
FR2072714A5 (fr) * 1969-12-01 1971-09-24 Courtaulds Ltd
DE3524220A1 (de) * 1985-07-06 1987-01-08 Stoll & Co H Rberwachungseinrichtung im fadenablaufsystem einer flachstrickmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB223643A (en) * 1923-07-23 1924-10-23 George Hunston Edman Improvements in or relating to knitting machines
US2608844A (en) * 1950-07-21 1952-09-02 Josef S Karl Yarn carrier with takeup device for hosiery machines
DE1585413A1 (de) * 1965-06-25 1970-05-21 Terrot Soehne & Co C Verfahren und Vorrichtung zur Erzielung einer schmalen Schlussstelle bei Rundstrickmaschinen mit Fadenwechslern und Gummifadenlegern
FR2072714A5 (fr) * 1969-12-01 1971-09-24 Courtaulds Ltd
DE3524220A1 (de) * 1985-07-06 1987-01-08 Stoll & Co H Rberwachungseinrichtung im fadenablaufsystem einer flachstrickmaschine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001077427A1 (fr) * 2000-04-06 2001-10-18 University Of Manchester Institute Of Science & Technology Systeme de distribution de longueurs de fil precises
US6745598B2 (en) 2000-04-06 2004-06-08 University Of Manchester Institute Of Science & Technology Precision delivery system

Also Published As

Publication number Publication date
GB9022952D0 (en) 1990-12-05

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