US2940285A - Yarn feeding and changing mechanism for circular knitting machines - Google Patents

Yarn feeding and changing mechanism for circular knitting machines Download PDF

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Publication number
US2940285A
US2940285A US688161A US68816157A US2940285A US 2940285 A US2940285 A US 2940285A US 688161 A US688161 A US 688161A US 68816157 A US68816157 A US 68816157A US 2940285 A US2940285 A US 2940285A
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Prior art keywords
yarn
trapper
actuator
dial
needles
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US688161A
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English (en)
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Saunders Alfred Percy
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Wildt Mellor Bromley Ltd
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Wildt Mellor Bromley Ltd
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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
    • D04B15/54—Thread guides
    • D04B15/58—Thread guides for circular knitting machines; Thread-changing devices
    • D04B15/60—Thread guides for circular knitting machines; Thread-changing devices with thread-clamping or -severing devices

Definitions

  • This invention relates to yarn feeding and changing mechanism for circular knitting machines of the cylinder and dial type, and has reference particularly to yarn feeding and changing mechanism of the kind including a plurality of yarn guiding feeders each of which has associated therewith an individual yarn placing element, and wherein the said elements are operable selectively and each adapted, when so operated, not only to contact and move the companion yarn feeder from a non-feeding position adjacent to yarn trapping and severing means into a feeding position at which a yarn is favourably disposed by the feeder for introduction to needles of one of the
  • the invention may be applied to cylinder and dial machines of the rotary cam box type, i.e. of the type wherein the cylinder and the dial are stationary whereas the cylinder cam box and the dial cam plate furnished with the cams necessary for actuating the sets of cylinder and dial needles, revolves together.
  • the object of the present invention is to provide general improvements in the construction, operation and control of a yarn feeding and changing mechanism of the kind concerned as will be hereinafter described.
  • a particular aim is to enable the improved mechanism to feed to the needles difierent types of yarn or thread such as fine nylon thread, elastic yarn, yarns of wool and many other combinations, and efiiciently to effect changes as from a yarn or thread of one character to a yarn or thread having quite different characteristics.
  • the invention may advantageously be embodied in a horizontal striping attachment.
  • a common actuator which is adapted, when selected and moved to initiate introduction of a yarn to appropriate needles, to be advanced in two separate and defined stages, viz a first stage during which the common actuator moves the yarn placing element into its operative position and, in so doing, first causes the said element to contact the companion yarn feeder and displace it from its nonfeeding to its feeding position, and a second stage at which the corresponding trapper operating member is operated suchwise as to open the relevant trapper and thereby release the yarn introduced to the needles.
  • yarn placin elements will be referred to as yarn placers.
  • the common actuators one to each yarn feeder and corresponding yarn placer and independent trapping and severing. unit, and these actuators are adapted to be selectively operated, through the medium of control connections of any suitable character at the dictates of timing mechanism.
  • Each common actuator may advantageously be suitably biassed, e.g. by a spring, towards its normal inoperative, i.e. un-selected, position and arranged to be advanced against the biassing means.
  • an individual spring-influenced check pawl or detent may be provided for co-operation with spaced formations in.
  • each actuator these formations, two in number, serving to define the two separate stages in the advance of the actuator to its fully operative position. That is to say, engagement of the check pawl or detent into the first of the two formations will determine and define the first stage of the advance of the actuator to effect introduction of the relevant yarn to the needles of the appropriate set, whereas the second stage of such advance to open the corresponding trapper and release the said yarn will be determined and defined by the engagement of the check pawl or detent in the second formation.
  • the check pawl or detent When engaged in said second formation, the check pawl or detent functions to hold the actuator fully forward with the corresponding yarn feeder in its feeding position which latter is maintained for as long as the yarn is' required to be fed to the needles.
  • the check pawl or detent For eifecting withdrawal of such yarn feeder from knitting as, for instance, at a yarn change, the check pawl or detent is moved under suitable control against the spring action influencing it, as a consequence of which the common actuator is released for rapid return to its inoperative position under the action of the aforementioned biassing means. Simultaneously with this return, the corresponding yarn placer and the associated yarn feeder, conveniently influenced by a common spring, are retracted to their inoperative positions.
  • each yarn placer and the corresponding actuator during the second stage of advance of the latter.
  • the purpose of this is, of course, to enable a yarn feeder and the associated yarn placer to remain stationary in their feeding positions whilst the actuator is moving forward to complete .its second stage of advance at which point it efifects actuation of the trapper operating member and opening of the trapper to release the newly introduced yarn; In this way the said yarn is enabled to be safely taken and knit-ted by a few (say two or more) of the needles of the appropriate set before the yarn is released from .the trapper.
  • an individual spring-influenced check detent separate and vdistinct from the corresponding actuator check pawl or detent, is provided in conjunction with each trapper operat ing member for the purpose of maintaining the latter in the position to which it is moved by the said actuator during the second stage of the advance thereof.
  • the check detent functioning in conjunction with each trapper operating member is arranged to act on the latter suchwise as to hold the :revelant trapper open for as long as an introduced yarn is required to be fed to the needles.
  • a spe cific constructional example of a striper mechanism arranged for feeding a selected one of a plurality, say four,
  • Figure 1 is a vertical sectional view, partly inside elevation, illustrating the striper mechanism shown in relation not only to the cylinder and dial of the machine but alsoto the means for controlling the said mechanism,
  • Figure 2 is a front view, of' the striper unitp'er' se as seen in the direction of the arrow A in Figure 1, I
  • Figure ,3 is a rear view of the unit as seen inithe direction of therarrow B in Figure 1
  • v V r V t Figure 4 is a detail front view of-the independent yam trapping and severingrunits as view ed in the directio of'the arrow Crinr Figure l, H 7 r Figure!
  • Fi gl11'6S 7 and 8 are two comparative diagrammatic 4 a a v and 24, on the one hand, and 25 and 26' on the other hand, which blocks are spaced apart height'wise and secured by screws 28 in the upper portion of the framework, are suitably grooved or slotted longitudinally at 23a, 24a, 25a and 26a suchwise as to provide guideways for a plurality of horizontally movable actuator slides 29. As viewed from'either end in Figures 2 and 3, or in cross-section, however, these actuator slides 29 are arranged vertically in close side-by-side relation.
  • Each actuator slide 29 is longitudinally slotted at 30 to accommodate a short tension spring 31 the leading end 31a of which latter is anchored to the front vertical edge of the slide;
  • the rear ends 31b ,ofthe springs 31 are securedlto, a. split pin 32 which extends transversely through the longitudinal slot 30 and is fixed in the side plates 21-and 22, Projecting outwardly from, the rear vertical edge of each actuator slide 29 is a tail butt 33,
  • the circular knitting machine to which the striper imechanism now to :be described is applied includes a stationary cylinder lfurnished'with cylinders needles suchas 2. and 'a stationary-dial 3 equipped with dial needles such as 4.
  • a stationary cylinder lfurnished'with cylinders needles such as 2.
  • 'a stationary-dial 3 equipped with dial needles such as 4.
  • Surrounding the cylinder 1 is an annular cam boxs which is mounted upon a rotary carriage 6.
  • Cams. '7 and 8 attached respectively to the cam box and the roferenthorizontal planes and indicated more clearly 'in Eigure ,3; Ih'us, by pressing, inwardly upon the end of arselected tail :butt'33, the corresponding actuator slide 29 is advanced against the action of its controlling ten l.
  • each actuator slide In the upper horizontal edge of each actuator slide there are formed two, small V-shaped notches 34 and 35 arranged one closely behind theother. A check pawl 36 is provided for engagement successively in these. notches 34 and 35, whenever an actuator slide 29 is advancedagainst its spring action as described. Thatis to say, there is one check pawl 36to each actuator; slide 29v,tthese check pawls being mounted side by sidefor pivotal movement independently about a transverse pivot pin 37 located between the vertical side plates 21 and 22*"of the framework. ,To' expose the notched uppers edges of the actuator slides 29 for cooperation with the check pawls 36, and at the sametime provide 7 theuecessaryspace for accommodation'of the latter, the
  • said unit may-be supportedupon 'a bracket orfhrackets' (not shown) carried by & any appropriate partjofthe knitting 'head ofithe machine.
  • the unit comprises two suitably spaced, and parallel arate, and distinct stages defined by engagement of the 7 relevant spring-influenced checltgpawl 36 successively.
  • The-outerend 39b of the plunger 39 is of less width after O IeXP iflQ -r
  • the framework ofrthe-sn'iperr V i i i f ifl, 'whi ihi is rectangular in plan,- is. directed radially awards with its lower, portion .20 located adjacent to the cylinder'fand dial needles 2 and 4.
  • the 7 upper portion of the framework-is rectangular nshape whil'stits lower portion 20a is of downwardlyitaperingbfonm (see Figure :1);
  • each yarn placer 46 When in its normal retracted (non-feeding) position depicted in full lines in Figure 1, each yarn placer 46 extends downwardly and rearwardly somewhat so that a protuberant yam-engaging nose 47 provided at its lower extremity is withdrawn within the framework. A lower marginal portion of each yarn placer 46 adjoining its nose 47 is bent upwardly to form a channel 48-shown more clearly in Figure 9.
  • each yarn placer 46 Rigidly secured to the upper end of each yarn placer 46, at the same side thereof as the channel 48, is a rearwardly directed operating element 49 having an upwardly extending tail 50 for contact by the front lower corner of the corresponding actuator slide 29 (see Figure 1).
  • the normal retracted position of each yarn placer 46 is determined by contact of the rear inclined edge 51 of its operating element 49 with an inclined frontal face 52 of the front longitudinally grooved transverse block or plate 26 assisting to support and guide the actuator slides 29.
  • each yarn placer 46 Provided at the channelled side of each yarn placer 46 is a comparatively thin companion yarn feeder 53 in the form of a lever with a yarn guiding lower extremity 54.
  • These yam feeders are, at or near their upper ends, mounted to fulcrum about a transverse pivot pin 55 which is set in the framework at a location substantially below and to the rear of the transverse pivot pin 45 constituting the fulcrum of the yarn placers 46.
  • Each yarn feeder 53 extends forwardly and downwardly from its fulcrum and passes through, and in contact with the bottom, of the channel 48 formed at the lower extremity of the companion yarn placer 46.
  • each yarn placer 46 and the companion yarn feeder 53 are influenced by a single tension spring 56 connecting the two together. As shown more clearly in Figure 9, one end of this return spring is anchored to a lug 57 provided on the upper end of the yarn feeder 53 adjacent to itsfulcrum 55 whereas the opposite end of the spring is connected to a pin 58 fixed in the underside of the operating element 49 rigid with the yarn placer 46.
  • the companion yarn feeder 53 is acted upon by the bottom of the channelled portion 48 of the yarn placer 46 and is turned upwardly about the yarn feeder fulcrum 55 so that the yarn guiding extremity 54 of the said feeder moves along a near-vertical arcuate path in front and clear of the hooks of the advanced dial needles.
  • this conjoint movement of the nose 47 'of the yarn placer 46 and the yarn guiding extremity 54 of the yarn feeder 53 causes the relevant ingoing yarn Y (see Figure 9) to be gagement of the yarn with the needle hooks.
  • an ingoing yarn may be introduced to the needles at a gap in the needles resulting from predetermined ones of the latter being unselected.
  • the lower ends of the vertical side plates 21 and 22 of the framework of the striper unit are connected by a horizontal transverse plate 56 surmounted by'a vertically slotted block 57 constituting a common carrier for the independent trappingand severing units U.
  • These units U are located immediately beneath the lower yarn-guiding extremities 56 of the yarn feeders 53.
  • Common to all of the trapping and severing units U is a transverse spindle 58 upon which are pivotally mounted pairs of conjointly movable trapper blanks 59 and scissor blades 60.
  • each such unit comprises a fixed cutter block 61 at the righthand side of the unit, when an immediately adjacent pivoted scissor blade 60 for co-operation with the fixed cutter block, next a fixed trapper part 62 and, adjacent to the latter and at the left-hand side of the unit, a pivoted trapper blade 59 which is rigid and movable together with the corresponding pivoted scissor blade 60.
  • the unit is completed by the provision of a blade spring 63 which, by exertion of pressure laterally upon the left-hand side of the pivoted trapper blade 59, provides sufiicient friction between the latter and the fixed trapper part 62 to exercise the necessary grip' upon a yarn withdrawn from knitting.
  • Each pivoted scissor blade 60 is extended rearwardly to provide an arm 64 and this blade and also its companion trapper blade 59, are articulated, by means ofa pinand-slot connection 65, 66, with the lower end of a corresponding upwardly and rearwardly extending trapper operating lever 44.
  • All of the trapper operating levers 44 are mounted to turn about the same transverse pivot pin 55 constituting the fulcrum of the yarn feeders 53.
  • Anchored to the outer end of each pivoted scissor blade actuating arm 64 is one end of a tension spring 70 the opposite end of which latter is anchored to a transverse pin 71 carried by the side plates 21 and 22 of the framework. Turn ing movement of one of the arms 64 against the spring action simultaneously opens both the relevant trapper and the adjoining scissor device. On the other hand, release of such arm permits it to turn in the reverse direction under the reaction of the corresponding spring 79 suchwise as smartly to close the trapper and scissor device.
  • An outgoing yarn trapped in a trapper is crimped byvirtue of extending around the edge of the fixed trapper part 62 and between the outer side of the latter and the inner side of the pivotedtrapper blade 59 as well as between the inner side of the said fixed trapper part 62 and the opposing face of the pivoted scissor blade 60.
  • each pivoted trapper operating lever 44 is, as shown more clearly in Figure 9, formed with an upwardly directed extension 72 extending beyond the fulcrum 55, and this extension projects through aslot 73 formed in the rear one 25, of the two lower grooved blocks or plates supporting and' guiding the actuator slides 29.
  • the extremity of the said upwardly directed extension 72 of each lever 44 is arranged to be V in the path of the shoulder 43 produced by recessing at 42 the lower horizontal edge'of thecorresponding actuatonslide 29. Consequently, during the second stage in the advance of.
  • a second'release plunger-78 This plunger 78,.like the hereinbefore described-first release plunger 39, is mounted upon the. transverse block or plate 27 and is provided with an operative inner end 78a sufiiciently wide to act on all the detents 74 together.
  • the outer end 78b of the second release plunger .78 which latter is controlled by a compression spring 80, is of a somewhat narrower width and projects outwardly from the framework beneath the superimposed butts 33 on'the actuator slides 29. 1 a a
  • the common selector 41' in theform of a striker plate which is adapted to beshif'ted-up or down, under suitable control, either into one or another: of the aforementioned difierent planes or into a neutral position (indicated in Figure: 1) below and clear'of thetail butts 33.
  • a neutral position indicated in Figure: 1 below and clear'of thetail butts 33.
  • the common'selector '41 in the specific'example illustrated is mounted upon'a carrier I 84- which is slidable to various-positions heightwise along a vertical guide post- (not shown), the carrier being guided V by'an additional post 85, and ⁇ the selector restingagainst aguide plate 86.
  • the guide posts are secured in a fixed bracket 87 to the underside of which is'attached a sleeve 88, for the guidance of a vertically 'movablerod .89;
  • first releaseplunger 39 is pressed in as a 'consequenceo'f' which the actuator slide corresponding to "the yarn tobe withdrawn is-releasedto effect retraction of the relevant yarn placer 4 6- and companion yarn feeder 53 to their non-feeding positions.
  • This action lays the outgoing yarn across the appropriate trapper and severing 'unit U, whereupon the second release plunger 78 is immediately pressed in to trip; thev appropriatetrapper operating lever 44 and so close the corresponding trapper and scissor device to trap and sever this yarn.
  • feeding and changing mechanism comprising a plurality of .yarn feeders Pivotallymounted'sideby side,adjacent to thecylinder and dial; each ofsaid feeders adapted to V moveupwardly fromanon-feeding positionintoafeed feedersand pivotally mounted side by side: for movement ing position; a plurality of corresponding selectively operahle yarn placers arranged in contact with said yarn radially inwards and outwardswith respect to the needles;
  • an independent yam trappingv and severingunit-foreach yarn feedensaid unit comprising a trapper having tired and pivoted trapper elements and a-cutter having fixed and pivoted scissor" elements, levers which are mounted to pivot independently of, but about the same axis as, the yarn feeders and are pivotally connected to the pivoted trapper and scissor elements for operating the same, common actuator slides mounted side by side each for pushing against and actuating a yarn placer-and hence rier 84 whil'st at its lower end thesaid rodimpinges on i aco'ntrol lever having aitoe'91 arranged; to be acted upon by lugs such a's'19 of different heightson the timing "or patterningchain 18.
  • a combination according to claim 1 wherein an individual spring influenced check detent, separate and distinct from the corresponding actuator check pawl is provided in conjunction with each trapper and scissor operating lever to maintain the latter in the position to which it is moved by the corresponding common actuator slide during the second stage of the advance thereof.
  • a combination according to claim 3' including spring means for each trapper and scissor operating lever whereby whenever an actuator slide moves during the second stage of an advance, it actuates the relevant trapper and scissor operating lever against the spring action and the corresponding check detent is automatically disposed to hold said lever in a loaded condition, and also including control means for triggering of a check detent associated with a loaded trapper and scissor operating lever whereby when a detent is so triggered, the corresponding trapper and scissor operating lever is released under the spring action to close the trapper.
  • a yarn feeding and changing mechanism comprising a plurality of yarn feeders pivotally mounted side by side adjacent to the cylinder and dial for movement such that its yarn guiding extremity moves up along an upright arcuate path from a non-feeding position into a feeding position clear of the hooks of the dial needles, and vice versa, a plurality of corresponding selectively operable yarn placer-s disposed in contact with said yarn feeders and pivotally mounted side by side for movement radially inwards and outwards along a slightly arcuate path with respect to the needles, each yarn placer when so moved inwardly first raising the companion yarn feeder into its feeding position and then introducing a straight length of yarn extending between said
  • a combination according to claim 5 including individiual pivoted spring influenced check detents auto: matically turnable underthe spring action into operative. positions to maintain the trapper andscissor operating levers in the positions to which they are moved by the corresponding common actuator slides during the second stage of the advance (thereof, springs controlling said, operating levers and against the action of which the'lat ter are actuated when pushed by said slides during such advance thereof, and control means for turning a selected check detent against the spring action and thereby releasing the corresponding trapper and scissor operating lever, to close the trapper and cutter.
  • each trapper and scissor operating lever is articulated by means of a pin and slot connection to the movable trapper and scissor elements of the correspond ing independent yarn trapping and severing unit.
  • a yarn feeding and changing mechanism ineluding a plurality of side by side yarn feeders for feeding yarns selectively to the needles, a plurality of corresponding side by side selectively operable yarn placers for contacting and moving the companion yarn feeder from a non-feeding position into a feeding position where the yarn is favorably disposed for introduction to needles of one of the two sets in the machine and for acting on the yarn so disposed to displace it in a radially inward direction to effect such introduction, an independent yarn trapping and severing unit for each yarn feeder, said unit comprising a trapper having fixed and movable trapper elements and a cutter having fixed and movable scissor elements, members for operating the individual trappers, common actuators in the form of slides which are arranged side by side and are provided with tail butts

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
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US688161A 1956-10-15 1957-10-04 Yarn feeding and changing mechanism for circular knitting machines Expired - Lifetime US2940285A (en)

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GB31292/56A GB821151A (en) 1956-10-15 1956-10-15 Improved yarn feeding and changing mechanism for circular knitting machines

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DE (1) DE1155211B (fr)
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4121439A (en) * 1975-06-16 1978-10-24 Wildt, Mellor Bromley Limited Knitting machines
US4967575A (en) * 1987-10-06 1990-11-06 Elitex Koncern Textilniho Strojirenstvi Thread cutting and holding device
CN101492859B (zh) * 2009-02-13 2010-12-08 惠安金天梭精密机械有限公司 防止调线机织针损坏的方法及带纱刀结构
CN102433666A (zh) * 2010-09-29 2012-05-02 吴江市华英纺织品有限公司 纱箱卡位装置
CN110644127A (zh) * 2019-10-22 2020-01-03 泉州全能智控机械研究所有限公司 调线头
CN110820159A (zh) * 2019-11-20 2020-02-21 唐山雾谷机电设备有限公司 全自动换线打结器

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1273113B (de) * 1961-09-08 1968-07-18 Hans Mantel Fadenschneidvorrichtung an Rundstrickmaschinen
DE1226736B (de) * 1964-05-23 1966-10-13 Strickmaschb Karl Marx Stadt V Fadenwechselvorrichtung fuer Rundstrick-maschinen
IT1132648B (it) * 1979-09-28 1986-07-02 Wildt Mellor Bromley Ltd Unita' di caricamento e cambiamento fili
CN105442174B (zh) * 2016-01-25 2017-04-19 南阳理工学院 建筑内装饰物编织装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1500083A (en) * 1924-07-01 A cokpobation of pennsyl
US1951842A (en) * 1934-03-20 Knitting machine
US2000194A (en) * 1933-07-08 1935-05-07 Standard Trump Bros Machine Co Knitting machine
US2290058A (en) * 1939-10-25 1942-07-14 Bentley Eng Co Ltd Yarn-changing mechanism for knitting machines

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE601122C (de) * 1930-12-10 1934-08-08 Wildt & Co Ltd Fadenklemmvorrichtung fuer Strick-, insbesondere Rundstrickmaschinen
GB369227A (en) * 1930-12-16 1932-03-16 Wilfred Brewin Improvements in circular knitting machines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1500083A (en) * 1924-07-01 A cokpobation of pennsyl
US1951842A (en) * 1934-03-20 Knitting machine
US2000194A (en) * 1933-07-08 1935-05-07 Standard Trump Bros Machine Co Knitting machine
US2290058A (en) * 1939-10-25 1942-07-14 Bentley Eng Co Ltd Yarn-changing mechanism for knitting machines

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4121439A (en) * 1975-06-16 1978-10-24 Wildt, Mellor Bromley Limited Knitting machines
US4967575A (en) * 1987-10-06 1990-11-06 Elitex Koncern Textilniho Strojirenstvi Thread cutting and holding device
CN101492859B (zh) * 2009-02-13 2010-12-08 惠安金天梭精密机械有限公司 防止调线机织针损坏的方法及带纱刀结构
CN102433666A (zh) * 2010-09-29 2012-05-02 吴江市华英纺织品有限公司 纱箱卡位装置
CN110644127A (zh) * 2019-10-22 2020-01-03 泉州全能智控机械研究所有限公司 调线头
CN110644127B (zh) * 2019-10-22 2024-03-15 泉州全能智控机械研究所有限公司 调线头
CN110820159A (zh) * 2019-11-20 2020-02-21 唐山雾谷机电设备有限公司 全自动换线打结器
CN110820159B (zh) * 2019-11-20 2024-04-12 唐山雾谷机电设备有限公司 全自动换线打结器

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DE1155211B (de) 1963-10-03
GB821151A (en) 1959-09-30
FR1186379A (fr) 1959-08-21

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