Патент USA US2412248код для вставки
Dec. 10, 1946. I P. w. BRlsTovy- " " - 2,412,248 KNITTING METHOD AND vMACHINE ` Filed oct. 12, ’1941/ 5 sheets-sheet 1 "fk"` , ' " :il /lg /20 95 §22 Í 1576./ f I 1 , _ 2L /àu/Wßfísfow - y /Jwfî w, Dec. 10, 1946. P. w`. BRlsTow KNITTING METHOD AND MACHINE .2,412,248 y 3 Sheets-Sheet 2 Filed oct. 1_2, 1944 ./ l / Dec. 10, 1946. P. w. BRlsTow 2,412,248> ` KNITTIÑG METHOD AND MACHINE Filed 001'.. l2, 1944 3 >SheetSV-Shee‘l; 3 w? ¿2,412,248 Patented Dec. 10, 1946 neural) stares PATENT oFFlcE 2,412,248 KNITTING METHOD MACHINE Paul W. Bristow, Laconia, N. H., assignor to Scott & Williams, Incorporated, Laconia, N. H., a cor poration of Massachusetts Application October 12, 1944, Serial No. 558,337 19 Claims. (Cl. (i6-_14) 1 2 This invention relates to knitting machines of the type having superposed needle cylinders as shown, for example, in the patent to Bentley, Figure 4 is a section taken on Athe plane indi cated at 4-«4 in Figure 3; and Figure 5 is a development, similar to Figure 1313336, dated May 2l, 1929. 1, but showing cams and associated parts par ticularly involved in a hosiery machine. In machines of this type, the needles are under the control of sliders and are transferable to and from each needle cylinder to permit the knitting of a continuous fabric such as tubular fabric com~ prising courses some of the stitches of which are The machine to which the present invention is applied may have any number of feeds ranging from a single feed in the simplest case, for eX ample in a hosiery machine, through two feeds knitted with needles operating in one cylinder 10 which also may constitute a hosiery machine, up to a machine having quite a large number of while other stitches are knitted by needles op feeds of the so-called body-knitting type. In erating in the other cylinder. By shifting the the following description, reference will first -be needles from one cylinder to the other reverse made to a modification of the invention partic concatenations of loops are effected to produce, when the shifts are frequent and elaborate pat 15 ularly adapted to a body machine in which no provision need »be made for reciprocatory knit terns are produced, the fabrics which are com~ ting, narrowing, or widening. In such a body monly referred to as links-and-links fabrics. machine, it may be assumed that there is pres Such fabrics may have quite elaborate designs, such as diamonds or blocks, formed therein and ent an even number of feeds grouped in pairs, may range to simpler patterns involving fairly 20 a pair being herein described as involving a phase of operation. However, an underwear machine continuous ribs, various patterns being the re~ may have any desired number of feeds, from one sult merely of suitable control of the needle trans- upwards, between transfers. In this case two fers. are shown, by way of example only. If only two The broad object of the present invention is _the provision of a knitting machine in which elab 25 feeds are involved, the phase would extend through 360 degrees and the end of a phase would orate handling of the needles is made possible then coincide with the beginning of the same with particular insurance that no needle will phase. In the case of two phases, each would ever be free of control in both cylinders, i. e., will comprise 180 degrees and they would be arranged not be released by both the sliders which are in succession so that the end vof one would coin available for its control. cide with the beginning of the other. Obviously, A further object of the invention is the pro such sequential arrangement can be carried on vision of a machine of the type indicated in to a quite large number of phases as would be which tuck and ñoat stitches may be produced present in a large body machine. It will be evi in the links-and-links fabric. dent that a description of one phase will suffice Still another object of the invention is to pro to cover any number of such duplicate phases. vide a knitting machine of the type indicated in Figure l shows in diagrammatic fashion the which stockings may be produced, provision be cams for control of the sliding elements, i. e., slid ing made for reciprocatory knitting of heels and ers, jacks and verges, for a single phase. Each toes with the incidental narrowing and widening 40 phase comprises two feeds, the ñrst involving a operations. stitch cam 2 arranged to control needles to take These and other objects of the invention, par yarn from a feeding station indicated- at 4 at ticularly relating to details of construction, will which one or more yarn feeding fingers may be become apparent from the following description located, and the other involving a stitch cam 5 read in conjunction with the accompanying draw 4.5 arranged for the control of needles to take yarn ings, in which: at a second feeding station indicated at 8 and at Figure l is a development of the cams for act which similarly a number of yarn fingers may ing upon sliders, jacks and verges, various asso be provided. The stitch cams 2 and 6 may be axially adjustable for the control of length of ciated parts also being illustrated, Figure 1 en compassing these elements throughout one phase 50 stitches drawn thereat. of the mechanism; l Figure 2 is a section taken on the plane the trace of which is indicated at 2-2 in >Figure 1; Figure 3 is a perspective View showing Vcertain jack selecting elements; Beyond the stitch cam 2 there is located a cam lil serving to cause clearing of latches by loops which are drawn under ,the action of the stitch cam 2. This cam l0 is radially movable so that 55 when withdrawn needles may ride at a tuck level. 3 4 To provide clearing of latches at the second feed there is provided a cam I2 which, alternatively The lower and upper sliders which permanently remain in their respective cylinders are indicated diagrammatically at the right of Figure 1. The lower sliders 66 are provided with butts 68 and l0 which, together, by cooperation of the cams, serve to control the movements of the lower slid with a control hereafter described, will effect rise of needles in the lower` cylinder to a latch clear ing height. A cam I3 located immediately beyond cam |2 cooperates with the alternative latch clear ing means. Cam l2 is adapted to be radially withdrawn vto permit needles to pass at a low level. ers. rI‘he lower sliders are provided with hooks 12 engageable in conventional fashion with the lower hooks of the double hook needles 13 to serve , Cams I4 and l5, both of which are radially 10 to control their movements. The upper sliders ‘i4 are similarly provided with movable, are adapted to eifect, when in inner . position, rise of needles for purposes hereinafter described. A cam I8 is provided to effect trans' fer of needles from the lower to theupper cyl-, inder when the needles are partially raised by 15 selective control means. A cam 20 serves to di vide two raceways and serves to raise sliders in the lower cylinder which do not carry needles. A cam 24 serves to lower sliders to insure engage- ` pairs of butts 16 and 'I8 which, by cooperation with the cams related to the upper cylinder, serve for their control. These upper sliders are pro vided with hooks 80 engageable with the upper hooks of the needles to actuate them when` 'the lower hooks are operating to handle the yarn. A cam 82 in the needle transfer region oper ates in conventional fashion to tilt the sliders to ment with stitch cam 6 even though, by virtue 20 disengage their hooks from the respective nee dles, as indicated in Figure 2t The action is a of adjustment, the stitch' cam occupies a position conventional one such as described in Houseman K lower than that shown.- A ,similar cam 22 eifects Patent No. 2,252,769. v the same function in conjunction with the stitch Below the lower sliders are located jacks H6 cam 2. „ ~ To guard against overrun of the lower sliders 25 which are acted upon by a series of controlling cams which will now be described. . as they travel down the stitch cams 2 and 6, These jacks ||6 are provided with upper butts there are provided camsvZS and 28 which are H8, saw-tooth butts H9, and lower butts |26 vertically adjustable, respectively, along with the . which are provided with undercuts indicated at stitch cams 2 and 6. These cams also have rises as indicated to insure that the lower sliders prop 30 |22 adapted to be engaged by the sharpened edges of suitable cams. Among the cams coop erly engage the cams i4 Yand l2, respectively. erating with these butts are 84, 86, and 88. In Cams- 30 and 32 are guard cams which segre advance of the cam 84 there are selectively in gate sliders controlling needles ‘I3 through knit wardly movable cams 90 adapted to be engaged ting waves from sliders which do not carry nee dles. Cams-34 and 36 serve to lower sliders in 35 by the saw-tooth butts ||9. A‘similar group of cams 92 is located in advance of cam 86 while a the _lower cylinder which do not carry needles to further similar group of cams 94 is located in avoid interference with the formation of stitches advance of the cam 88. Adjacent the groups of by needles in the upper cylinder which pass through knitting waves adjacent the positions of these cams. The cams associated with the upper cylinder include the stitch cams 38 and 40 associated, re spectively, with the first and second feeding sta tions. Cams 42 and 44 associated, respectively, cams 90, 92, and S4 are cams 96, 98, and |00, re 40 spectively, arranged to engage the outer surfaces of the butts |20 for the purpose of moving these butts inwardly to cause them to avoid engage ment with the cams 84, 86, and 88. Cams |02 and |04 are provided with sharpened edges and serve to engage the undercuts |22 of lower slid ers which have been pressed inwardly to elfect outward movement of the lower ends of these4 jacks to present them for action of the next se lective cams upon their saw-tooth butts, and also with cams 46 and 48 serve to lower upper slid ers to cause needles carried by them to clear their loops. Cams 58 and 52 are arranged to raise up pei` sliders to present them for proper engage `ment by the stitch cams 38 and 46, these latter being axially adjustable for the purpose of Con 50 to present their butts for possibleengagement by the respective cams 98 and |00. Cams |06 and trolling the lengths of loops knitted by needles | 68 are provided for action upon the upper butts in the upper cylinder. Cams 54 and 56 operate ||8 of jacks which are raisedby cams 84 and 86. alternatively with the cams 42 and 44, cam 54 Cam H2 defines a raceway through which b-utts being joined by a toggle connection with cam 42 and cam 56 being joined by a similar toggle con 55 H8 ride when jacks are raised by the cam 88. The cam ||2 is provided with a portion l|4 de nection with the cam 44. By this arrangement only one of cams 42 and 54 is in operation at the signed to engage butts || 8 Vand lower slightly jacks which are not engaged by the cam 88. A same time, while the same is true of the pair of cams 44 and 56. cam I|0 serves to lower jacks which were raised> Guard cams 58 and 88 are connected to the 60 by cam 88. Cams |24 and |26 are guard cams `same blocks as stitch cams 38 and 40 so as to be which carry additional cams |28 -and |30 which axially adjustable therewith. They prevent over act upon the butts ||8 of jacks which have not run of the needles when they are moved for stitch been raised respectively by cams 84 and 86 to in drawing and also serve by their rises to insure sure that these jacks remain in the cylinder slots proper engagement of the upper sliders with the 65 when the gaps in the vicinity of cams |06 and cams 42 and 44 following a stitch drawing opera |68 are reached. A cam |32 serves as aguard tion despite extreme adjustment of cams 38 and cam to define the extent to which butts `| I8 are 40 to draw extra long stitches. lowered bythe action of cam l I4. Y A cam 62 serves to lower upper sliders to effect Various other cams are provided, as indicated transfer of needles from the upper cylinder to 70 in Figure 1, which need no special mention, being the lower cylinder while cam 64 serves to re provided either to prevent overrun of sliders in store the upper sliders to a normal level after the event their friction inthe cylinder slots is in the transfer of needles therefrom, at which nor suincient or to insure movementsv by acting upon mal level they may again receive needles trans the Second Suder butt in the event thefbutt which ferred from the lower cylinder. 75 normally should deñne the slider movement 15 6 breaks. The functions of such auxiliary cams will be evident from the drawings. Additionally certain -carns perform the function of holding the sliders and jacks in their slots and prevent tilting when that is to be avoided. Referring to Figure 2, the upper cylinder is in dicated at 99 and the lower cylinder at IDI. These cylinders are provided with the usual slots for reception of the sliders, needles and jacks, at 24, fullydepressed at the second feed by the cam E to take yarn, and then raised, following a slight rise at cam 2S, either by the cam I2 or by its jack as hereafter described. In the paths F and A, the latches are cleared. If a ’tuck stitch is to be produced by failure of a needle to clear -its latch before taking yarn at the ñrst feed station 4, the slider may in a previous'phase approach the cam 2 along either the slots being defined by walls, preferably of 10 of the alternate paths A, C or B, D. After being the inserted type. The lower portions of the lowered by the stitch cam 2, it will `be raised by walls in the upper cylinder are axially slidable to the cam I4, and then further raised to the' path provide verges Iût, the lower ends m5 of which F either by the cam vIll or by action of its jack. serve to hold the yarn between loops when stitch rI‘his clears the stitch completed at the first feed. es are being drawn by needles in the upper cylin 15 It will then be lowered by the cam 6, but under der. 'I'hese verges are provided with butts 'I 01 this condition cam 'I2 is withdrawn so that it adapted to be acted upon by cams as hereafter leaves the phase along the path B. As will be described. Conventional arcuate sinkers |09 are evident from consideration of the phase, entry provided, controlled in the usual fashion by cams, into the next similar following phase along the to cooperate with needles in the lower »cylinder 20 path B cannot lead to a rise to the latch-clearing during stitch formation. level at C but rather, the rise ‘will only occur In Figure l, there are illustrated all of the pos~ under the action of the cam I5 to the path D sible paths which may be taken by the butts of in the approach to stitch cam 2. Consequently, the upper and lower sliders for the production of yarn is again taken at the ñrst feed of this fol~ the several results of which the machine is capa 25 lowing phase without .clearing of the loop which ble. As will be evident from that figure, 'the mo was taken at the second feed. Tucking will, tions of the sliders are, in general, deñned in each therefore, occur. As will be apparent hereafter, passage through the illustrated cams by the ac yarn in this following phase may be taken only tions of the cams on both upper and lower butts; at the second feed point, in which case the Acam i. e., in a single passage, the motion of a slider i5 will be withdrawn so that the path E will be might be defined first by action upon a lower butt, the continuation of the path B. Very compli then by action upon an upper butt, followed by cated tucking at successive feeds is possible, but further action upon a lower butt, and so on. In this need no-t be described in the present analysis. the figure, the parallel paths of both the upper Al third alternative involves production of a and lower butts are illustrated, and the complete CII tuck stitch by failure of a needle to clear its latch path Imay be ascertained by considering the suc-V before taking yarn at the second feed point. In cessive actions of the various cams on the butts. this case, as before, entry into the phase may The passage of sliders from the right-hand to the occur either along the path A, C or the path B, D, left-hand side of the figure will, for convenience, followed by lowering of the sliders by the stitch and as pointed out above, be referred'to as a phase of operation. As has been indicated, in a two-feed machine this phase of operation may extend through 360 degrees, so that the sliders leaving the left-hand cam 2 for the seizure of yarn at the first feed point. The sliders are then raised by the cam I4, but in this case, the cam Ill will be withdrawn and the slider will not be raised by its jack, with ie result that it 'will follow the path G which is side of the figure may be considered as imme insufficiently high to cause latch-clearing. The loop of yarn from the i-lrst feed point is, there the other hand, as is more usual in underwear fore, carried in the hook along with the -yarn machines, the complete circumference of the seized at the second feed point by the action of machine may involve a relatively large number of the stitch cam 6 and is cleared by the subsequent such phases in which the cams may be quite 60 rise of the slider over the cam l2, or by the action different. of its jack, to the path A. In any event, the lower sliders may enter a Multiple tuck stitches may be produced by entry phase along two alternative paths, A and B. of the slider along the path B, D, and depression Similarly, the upper sliders may enter the phase by the stitch cani 2 to take yarn at the first feedr along two alternative paths, J and L. Beyond 55 point followed by path G resulting from with this entrance, the paths may be variously split up drawal of the cam I I! and absence of action by in fashions which will be best understood by ref the jack. Yarn is then taken at the Second feedv ' erence to particular events occurring in the point under the’ action of the stitch cam E. The diately reappearing at the right-hand side. On phase. slider may then rise up cam l2 if this cam is in First, there may be considered the operations 60 active position or travel up, by action of its jack, in the lower cylinder giving rise to normal stitch to path A; or, on the other hand, it may remain formation at both feeds. If a lower slider carry in path B so that in the next phase, the stitch ing a needle enters at A, or if, as will be pointed may be cleared with rise of the needle to the out, shortly after entry a needle is transferred latch-clearing level either at the first or second thereto from the upper cylinder, the slider in feed, it being possible to take yarn again at the knitting will follow the successive paths C, F and first feed or to pass this feed without taking yarn A, so as to enter the next phase (or re-enter the under the float conditions hereafter described. same phase in a two-feed machine) on the path To produce a draw stitch at the first feed, the A. In this case, the slider is first slightly de slider must enter on the path B and then follow pressed at 22, depressed fully, so that its needle 70 the path E, resulting from the withdrawal of thewill seize yarn, by the cam 2, raised slightly by cam I B. If yarn is to be taken at the second feed cam 25 and then by the cam I4, if cam It is in either for forming a tuck or a normal stitch, the active position, then further raised either by its slider then rises over cam It to follow the path jack, as hereafter described, or by the cam Il] if G or over both vcam M and then, by the .action that >.cam is in active position, depressed slightly 75 of cam I0 or by jack action, to the path F. 2,412,248 7 phase, by >withdrawal of the cam 44 in which case ' To produce azdraw stitch at the' second feed, cam I4 isA withdrawn so that after’passing'the position of the stitch cam 2 the slider will follow the path H. If. a stitch in the phase is to be made with the yarn at the first feed, clearing of the the path J will be followed. -- ' ' ; If a draw stitch isto-be produced at the ñrst feed and knitting is to occur et the secondfeed, the slider must enter the Vphase along: the path J, when transfer ofi-its needle to the lower cylin latch by the loop of this yarn is then effected by ‘ der will not occur and under which condition >it'v will not cause seizure of the yarn at the ñrst rise of the slider to the path A either by the action of the cam I2 or rise of the jacks. The above describes in a general way> the pos feed,‘being only slightly raised by the stitch cam and then slightlyre-advanced by the cam 58 to sible alternative actions of needles controlled by sliders in the lower cylinder in a single phase. It will be evident, however, that the ultimate stitch formation in the fabric may depend, in cer~ engage the camV d2 now in action which, together with carnllß, will cause it -to follow the path M. It irs-then raised by camsEZ` and 40 to take yarn` at-the second feed followingl which it will take I the path N, if cam 44 is active, in order to clear the latch or, alternatively, the path J if the cam 44 is withdrawn,’withideferring of latch tain instances, on what has occurred in the pre ceding and succeeding phases, and, in fact, sev eral instances of that have been heretofore indi cated. It is possible, therefore, that quite com plicated stitch arrangements may be produced. clearing until the next phase. - „ Draw stitches will be produced at both feeds One further action of the slider in a phase may if cams 42 and 44 are both withdrawn, in which 20 take place attending transfer of a needle from case the path will be J, K, J. Y ' a lower slider to the corresponding upper slider. It may be noted that all of the various paths This will be more fully described hereafter, .but just described may-be followed not only by slid it will suffice to point out at the Present time that ers rwhich carry needlesybut by empty sliders to in this case the lower slider enters at A eithei` which needles are not transferred at the position carrying the needle to be transferred or empty, of cam~ ES. Such empty sliders may thus go the latter along the shaded portion of the path along with sliders carrying needles in the upper A. When the unshaded portion of the path is cylinder without having any effect. reached, the needle is transferred from the upper The transfer of all needles entering along path cylinder to the slider, but in then following the L from the upper cylinder to the lower cylinder -30 path O the needle is transferred or retransferred by cam 62- is a necessary event if patterns of to the upper cylinder, the rise being effected by links-and-links type are to be produced, or if jack action and the cam lâ. Beyond the cam I8 changes from one type of rib structure to an the path O is followed by the empty slider with other are to be made. However, where a con depressions at 3d and 36 for the purpose of get 35 siderable length of fabric is to be produced with ting the slider out of position to interfere with the out a change in the rib arrangement, as, forex needle latch when the needle is raised in the ample, a 1X1 rib top or a broad rib leg, it is not upper cylinder by cams S8 and dll and the latch is necessary to produce transfers of needles in each closing upon the seized yarn. If the empty lower course. In such case, once -the desired needle slider continued to follow a path at a higher level arrangement _is secured, cam 62 may be with it would be in the path of swing of the latch and drawn so that the sliders pass it atthel level of would interfere with yarn seizure. path L, thereafter going through any of the The upper sliders also have alternative paths various waves described above. At the same, for the production of different stitches and for time, of course, jack selection of the lower sliders effecting transfer. If knitting at both feeds is 45 for transfer is interrupted, or cam I8 may be to occur, the upper slider, which may or may not ' withdrawn. carry a needle, will enter along the path L and The action of jacks has been so far merely in will be depressed by the cam G2. If, at this time, dicated. The jacks perform three different it carries a needle, the needle will be transferred functions: namely, that of effecting selective to the lower slider so that through the shaded 50 transfer> of needles from lower to'upper sliders, portion of the path„the upper slider> will not that of providing selection as an alternative to carry a needle. When the position in line with the action of cam I0, and that of providing se the cam I8 is reached, however, and if the cor lection as an alternative to the action of the cam responding lower slider is raised over cam i8, the I2. The various possible paths of the jacks will upper slider will thereafter carry a needle and 55 now be described. \ will be raised successively by the cam 50 and the As in the case of the sliders, the paths taken stitch cam 33 at the first feed to take yarn there by the jacks are Vdetermined by the actions of at. It will then be advanced by the cams 42 and cams upon both upper butts H8 and the lower 46 along the path M to a level serving to clear undercut butts |20. The parallel paths of these the latch. Following this, it is again raised by 60 butts are indicated in Figure 1, the path of the the cams 52 and d0 to take yarn at the second lower butt having its lower edge shown as cor feed and is advanced by the cams d4 and 48 to responding to the throat of the undercut at I22. , follow the path N to effect clearing of the latch. The jacks enter the phase of operation described Thus stitches are completed at both the feeds along either of the alternative paths P and Q. and entry into the next phase takes place along 65 The former results from the depression of ajack ` ` l under the action of cam IIB. The _latter results if knitting is to occur at the first feed `and a from the depression of a jack by the action of the face II4 of the cam II2. As will be evident draw stitch is to be produced at the second, the path is as just described past the stitch cam 3%. from the drawings, the two paths differ only in In this case, however, the cam 42‘ is Withdrawn 70 that the path Q is slightly lower than the path P. so that the path K is followed. The cam 4d, If, following the path P, one of the cams 9U however, remains in action So that the slider is engages a saw-tooth butt II9 of a jack, the butt advanced by the cams 4d and 48 along the path I¿IlV thereof will be raised sufñciently to clear N to effectv clearing of the stitch. This clear the cam 98 _so that the lower end of the .jack will ing may, however, be delayed until a subsequent 75 not be .rocked inwardly thereby and will conse the path L. 2,412,248 quently be in such position that its undercut |22' will engage the edge of the cam 84 so that it, will be raised along'fthe path R, being subse» quently depressed by the action of cam Hlßon its butt H8. At the top of the rise along the path IZB will clear the cam Ißil andV consequently itv will followr the path V over the cam 38„ after which it will be depressed by the cam llß to the path` P.. In the rise over the cam 88, its corresponding needle will be raised so that even R, it will serve to elevate a needle from the path A through the initial part of the path O so that the needle will be thereafter raised by the cam if the cam I2 is withdrawn, it will, by engage ment with` the cam i3, be brought to the path A. I3 to transfer position. jack will. be rocked inwardly by the action of ì If no cam dll engages a butt of a jack, the path P is not raised by the action of a cam 9i) on one of its saw-tooth butts, its butt |29 will not cam |00 on >its butt |20 with the result that it will miss the cam 88 and will follow the path W. Upon reaching the face H4 of the cam H2, the be raised sufficiently to clear the cam 9€» with the result that the jack will be rocked inwardly and will, therefore, fail to engage the cam 84, thus- low the path Q previously described. , The butts IUT of the verges Ill3A follow the path If, on the other hand, a jack following the jack will bel slightly lowered and thereafter fol X which involves depressions by cams 3S) and el respectively followed by rises over cams 43 ing the cam H32, the undercut l22 of its butt l2@ and 45. The wavesV thus given to the verges cor which will be in a radially inner position will beV respond to the positions at which stitches are engaged by the cam H32 so that the lower end of the jack will be rocked outwardly for a` sub- 20 drawn by needles in the upper cylinder, The verges serve to measure the stitches by engage sequent action hereafter described (see the first ment of yarn between adjacent needles in the jack from the left in Fig. 3). upper cylinder, their use being specially pro If the jack enters the phase along the path Q, nounced when a series of successive needles are there are two possible operations which may oc following the path indicated at S. Upon reach cur. First is the normal intended one in which none ofthe cams B9 will engage any saw-tooth , knitting in the upper cylinder and so have in terposed no needles in the lower cylinder to hold butt. Under such circumstances, the jack will not be raised from the path Q and will follow one the yarn downwardly. , later picked up bythe cam m2 which will slightly I8, 22, 2, 3G, 29, 6, 32 and i3, so as to enter the phase at A and cannot possibly getinto the path B. As a result, it must be in position to receive It will be evident that a lower slider which has transferred its needle to an upper slider in ris butt position below the path` S, having its lower end rocked inwardly by the cam 9S and being 30 ing over` cam I3 must follow the path above cams raise it to the indicated path S and also move outwardly its lower end. If, however, in enter a needle transferred from the upper cylinder at ing along the path Q one of the saw-tooth butts cam 552.> This is of major` importance since, if is engaged by a cam 90, the jack will be raised an empty lower slider were in path B when pass by the cam. The rise imparted by the cam 9E) is only the same as the lowering action elïected . ing the transfer position, the corresponding up per slider would release the needle without its by the surface lill of the cam H2, and inas being received by the lower slider. Once so re much as the path Q is already below the path P by the amount of this rise, the rise so resulting 40 leased, itis unlikely that the needle will be re engaged by either slider, resulting in a load» will not effect the missingv of the cam 96 by the up that will cause the needle or slider to break, butt íZû, in fact, leaving the jack in the same or if the needle hook is contacted by a slider, the position as would occur if it entered along the path P and was not raised by a cam 52%. Con sequently, it will follow the path S as previously described, if it entered along path P but >was notJ raised by a cam Sil. , The action of the cams lllß and |82 result in slider cannot move outwardly and breakage of l either the. needle hooi; or the'slider hook will - occur. The invention deñnitely insures that no needle can ever become out of control by both sliders.` If, due to some miscalculation of the pattern set-up, `a lower slider fails to. transfer reach a position for action by the cams 92. All 50 its needle to an upper slider when it should do so, noy damage, eXcept to produce an undesired of the jacks are in position for engagement by pattern, will- result, since the needlewill remain the cams 92, their lower ends being positioned under control of the slider though it follows an outwardly by reason of the action of cam H32. incorrect cycle. , By the selective action of cams 92, therefore, cer tain of the jacks may be slightly raised to miss 55 The fact that the described path above the cams is necessarily followed by any lower slider the cam Q8 and accordingly follow the path T' which carries no needle means that so far as se over the cam 85, being subsequently depressed lection is concerned, it is possible to disregard by the cam lila. As a result of this rise, the nee any past performance of a slider and take into dles are positioned as if raised by the cam lli, regardless of whether that cam is in or out, to the 60 account only whatis Ato be accomplished there- v after. Otherwise, if an empty lower slider could path F previously described. If a jack is not follow oneof the knitting paths, it would be nec raised by one of the cams 92, its butt E25' will essary to insure its selection by one of the cams be rocked inwardly by the action of cam 98 (see 94 to be sure (when cam l2 is withdrawn) that the third jack in Figure 3) and, consequently, it will follow the path U, being engaged by the 65 it could not enter the phase at B. _The foregoing is obviously of advantage to the cam §94 having an action similar to that of cam the paths R and S being merged vbefore the jacks m2, namely, positioning the lower'end of the jack outwardly for another selecting action. As will be evident'from Figure l. the paths 'I'.andU ñxer in that the pattern >may be laid out in a’di rect fashion without, keeping in mindvthe pat terning in a preceding course. Thel safety race merge at the position of the cam lila. AAccord- 70 wayis necessary if there is any mixup of selec tion at the lap in the .back of a stocking caused ingly, all of the jacks are presented under-the' when the selecting cams change. same conditionsv to the next selecting action by cams 94. » In the modification of Figurey 5, which repre sents the application of the invention to a hosiery If a saw-tooth Vbutt of .lack is engaged by a cam 94, the jack will. be raised so that its'butt 75 machine capable of knitting heels and toes,> the 2,412,248 12 tive position except when widening takes place, ñrst feed is represented at |38 and may com prise a conventional series of yarn feeding fingers. whereupon it is lowered into active position, the Associated with this isa latch guard plate |39, inactive position being illustrated in Figure 5. In addition to the cams described, there are» the purpose of which is hereafter described. others not requiring specific mention but which At the lmain feed there are two stitch cams act as safety cams to avoid damage in case of |60 and |42 similar in construction butA adapted for alternative functioning, the upper acting> butt breakage, to prevent overrun of sliders, or to maintain sliders in the cylinder slots. The sliders in the case of this modification upon the upper butts of the sliders in the lower cylinder during the major round-and-round knit ting operations, while the lower acts upon the lower butts of such sliders during the forward reciprocations in the formation of heels and toes.Í A` center cam |44, acting on upper butts, funci tions in conjunction with the cams |40 and |42 and additionally in conjunction with the reverse 15 stitch cam |46. Guard cams |43 and |41 are provided to limit the downward movements of sliders as they are lowered by the stitch cams. Cam |88 is provided to act upon lower butts of are similar to those of Figure 1, but in this case the lower sliders are differentiated into two groups by having long and short butts, respec tively. Y The sliders controlling instep needles are provided with short lower butts and long upper butts, while those controlling sole needles are provided with long lower butts and short upper butts'so that diiferentiation of the two groups may be effected by partial lwithdrawal of cams as described below. The sliders are associated sliders for a purpose hereafter described. Cams 20 with jacks as in the mod_iñcation of Figure 1. |50, |542, and |54 are provided to cooperate with each other in raising sliders lowered by the for ward stitch cams to provide alternative clearing Knitting'a-t both feeds during rotary knitting bring the needles down to draw stitches. A' guard taking yarn at the feed station |39. Thereupon> cam |68 prevents overrun of sliders in the case it will ride over cams |50, |52, and |54 to the latchclearing level G' passing then beneath cam |60 and stitch cam |62 to J', taking yarn at the may be accomplished in both the lower and up per cylinders. In such case, a lower slider may of loops when in active position or the production . enter along any of the three paths A', B', or O’. of tuck or draw stitches Vby jacks when the cams 25 In case of entry along paths O' or B', the slider will ride over cams |66 and |08 to follow the. are inactive. A cam |56 serves to lower sliders path D’. In the case of entry at A', it will also as hereafter described. follow D', which is in the direct line of A'. After The second feed point is indicated at |58 and _ depression by center cam |44, it will then be de may comprise a series of yarn feeding fingers as sociated with cams |60 and |62 which serve to 30 pressed by stitch cam |410 along the path F' of stitch formation at the second feed. VCam |63 brings selected sliders to a position to present second feed station |58. Following this, it may. their needles for wrapping, this cam following a slider selecting means of the type indicated in continue on the path B’ or, alternatively, be raised at K' by the action of suitable wrap selec tion mechanism on its corresponding jack in the Figure 1, which, however, is not indicated inA this ligure except by the indication of the vpath taken by the sliders when selection occurs. `Cams |96y event that the needle'is to be wrapped. After being raised by cam |63 to the level at which and |68 serve to raise sliders for purposes here after described. l . wrapping> will take place, it will re-enter the phase of knitting at O'. kLatch clearing by theY . Cam |10 serves for the raising of lower sliders stitches Vdrawn at the second feed is occasioned to a transfer position following selection as in by the cam |68, wrapping taking place at tuck the modification of Figure 1 by selecting means not shown in the present modification. Cam |12 following cam |10 serves to re~lower the raised sliders which have delivered their needles to sliders in the upper cylinder. An auxiliary safety cam |`|| is provided to effect the same action as cam |12 if a lower butt is broken. Cam `|16 serves to raise lower sliders to a tuck level prior to the first feed point. Cam |18 serves to raise sliders as hereafter described during reverse reciprocation. Cams |86 and |82, operating upon upper sliders, level. l In the case of sliders in the upper cylinder, they enter the phase at P', pass beneath thecam _|80 to transfer their needles to the cylinder 50 sliders, then rise over cam |62 beyond which needles are transferred to upper sliderswhich are to control the taking of yarn. The sliders then pass over cam | 86 by which they are brought to a level such that their needle latches are po . sitioned to be held open by the latch guard plate |39. They then rise over the stitch cam |90, effect the transfer of needles from the upper cyl taking yarn at the ñrst feed. Depression of the inder to the lower cylinder and the return of the upper sliders then occurs under the action of sliders. Cam |86 acts upon sliders during the cams |92 and |93, the` needles being lowered by transfer operation to free their hooks from the the latter to a latch clearing position. They then needle hooks. Cams |86 and |88 serve top-Dre 60 rise over cam |94, pass above cam |96, and then sent the needles carried by the upper cylinder rise over lstitch cam |98 taking yarn at thesec to the first feed stitch cam |90, with which coop ond feed. They are then lowered by cams 200 erates a guard cam |9| to avoid overrun of the upper sliders. Cams |92 and |93 serve to lower the upper sliders to effect latch clearing. Cams and 202, the latter effecting clearing of the latches and bringing them back to -the path P’. Tucking may be effected at the iirst feed by |95, |96, and |91 present the upper sliders to the needles controlled in the lower cylinder if cam stitch cam |98 at the second feed with which |66 is withdrawn, with the result that the slidersthere is associated a guard cam |99 to prevent follow the path B', L' rather than path B', D’ moving at the tucking level as contrasted with overrun of the sliders. Cams 200 `and 202 fol lowing the second feed, lower the upper sliders 70 D' whichis at the latch clearing level. AThe and effect clearing of latches of the needles in remaining path will be the- same as that involved the upper cylinder. in knitting at the second feed, clearance of both The usual raising pickers 204 and 206 blank stitches occurringl as passage over the cam' |54 the cams of the main feed as indicated. A lower ing picker 208 normally occupies an upper inac 75 takes place. Y . If tucking at the second feed is to occur,`the 2,412,248 13r conditions are again similar to that involved in knitting at both feeds with the exception that cam |54 is now withdrawn and rise of the lower sliders first occurs, after the yarn is taken, by passing over cam |50 along the path H’ where.u by the needles are raised to a tuck level. Pro vision is not made in the set-up illustrated fo-r tucking in the upper cylinder. _ . Draw stitches may be produced at thenrst feed in the lower and upper cylinders; If this is to occury at the ñrst feed in the lower cylinder, cams |56 Vand |16 are both withdrawn so that the lower sliders follow the Successive paths B’ and M’ passing below the stitch cam Mil at the ñrst feed. Thereafter by the action of cams |50, |52, and |54, they are raised to the latch clear ing level at G’and are ready to pass through the stitch drawing wave at the second feed. of the path N’ sliders will ride and |56 in both the subsequent 14 at which level the picked up past the withdrawn cams |14 directions of reciprocation. Inl widening operation, this same picking occurs with the additional picking vdown of two needles upon each reciprocation inthe usual fashion by the lowering picker 20B which will effect lowering of the sliders to the active levels. With respect to avoidance of possible loss of control of a needle by both of its sliders, the action of the arrangement of Fig. 5 is similar to that of Fig. l. A lower slider, which transfers a needle to the upper cylinder by jack selection power to cam ile followed by a transferring rise over that cam is constrained to follow a path below cams |l| and |72 (and above the guard cam lf3) , above cam |44, under VM, over |43, above guard cam |49, and under iet, leaving the phase along the In case draw stitches are to be pro-duced in the upper cylinder at the ñrst feed cam 200 is 20 path A’ which insures its location in position to receive any needle transferred from the upper withdrawn, in which case, after leaving the stitch cylinder. It cannot possibly get into the path B’ cam |98 at the second feed, the upper sliders which is followed by sliders controlling needles forwill follow the path Q', thereby passing above various operations as described above. Even with the stitch cam |91). an error in the set-up of the patterning controls, If selective formation of draw stitches is to therefore, it is impossible for an empty lower slider occur at the second feed in the case of lower to get out of needle receiving position at the cylinder needles, cam |50 is withdrawn so that transfer point. the lower sliders, after leaving the stitch cam What I claim and desire to protect by Letters |40, will follow the path I', J', if not raised by jacks, below the stitch cam |52 thereafter fol 30 Patent is: 1. A knitting machine comprising superposed lowing either the path K', O' or the path B’ needle carriers, sliders provided with butts and previously described, the former being followed needles controlled by the sliders movable in said if wrapping is to occur. carriers, means for transferring all needles located If non~selective draw stitch production is to occur in the upper cylinder at the second feed, 35 in one carrier to the other carrier, means for thereafter transferring selected needles from the cam |92 is withdrawn so that the upper sliders, second carrier to the first carrier, rneansfor con after passing the stitch cam |90, will follow the trolling sliders in the second carrier to cause path R' above the stitch cam |98, missing the needles therein to form selectively stitches of yarn at the second feed. Thereafter these; sliders are again engaged by cams 2d@ and 262 to follow 40 varying types, and means for preventing sliders which have transferred needles to the rlrst carrier the path P’. from-being controlled by said means for causing As has been previously indicated, the sliders the formation of stitches. which carry instep needles are provided with 2. A. knitting machine comprising superposed short lower butts. If the cam llt is Withdrawn to miss all butts and cams ISG and |78 are par~ 45 needle carriers, sliders provided with butts and needles controlled by the sliders movable in said tially withdrawn so as to engage long' butts but miss short butts, thev short butt instep sliders will carriers, means for transferring all needles located reciprocate in the path made up of M', I', J ’ and in one carrier to the other carrier, means'for B’. The needles carried by these sliders accord thereafter transferring selected needles from the ingly fail to engage any yarn at either feed, 50 second carrier to the first carrier, means for con trolling sliders in the second carrier to cause holding lops during the formation of the heel needles therein to form selectively stitches of and toe for resumption of the knitting of the varying types, and means for preventing sliders instep or the loopers rounds. The long lower which have transferred needles to the first carrier butt sliders, on the other hand, will, in a for ward reciprocation, follow substantially the nor 55 from being controlled by said means forcausing the formation of stitches, thus positioning said mal knitting path involved in- knitting yarn at last named-sliders to receive needles from the the first feed. However, in this case, the stitch other carrier in a subsequent phase of knitting. cam |40 is raised so that the alternative stitch 3. A knitting machine comprising superposed cam |42 acting on lower butts cornes into action. and controls the wave involved inthe seizure of 60 needle carriers', sliders provided with butts and yarn. The path in a forward reciprocation is needles _controlled by the sliders movable in said carriers, means for transferring all needles lo then A', D', F', G', cams i5!! and |54 raising the cated in one carrier to the other carrier, means sliders, after knitting, to latch` clearing level. for thereafter transferring selected needles from In a reverse reciprocation, the long butt sliders will enter the phase from the left at the level 65 the second carrier to the first carrier, means for controlling sliders in the second carrier to cause of path A', will pass withdrawn cam |50, 'will needles therein to form selectively stitches of ride over stitch cam |42, will be lowered by cen varying types, and means for preventing sliders ter cam |44 to ride down the stitch cam lli@ which have transferred needles to the first carrier taking yarn at the ñrst feed, and will then ride over the. cam |18 to a latch clearing level. 70 from being controlled by said means for causing the formation of stitches until they have again This action occurs for ally except the picked become associated with needles. sliders which, on each reciprocation during'a nar~ fl. A knitting machine comprising superposed rowing operation, will be those which precede the group of long lower butt sliders. The action needle carriers, sliders provided with butts. and of the pickers is'to. raise the-slidersto they level 75 needles controlled by the sliders. movable» in said 2,412,248. 15 v1.6 carriers', means for transferring all needles located the means for controlling kthe formation of stitches for preventing sliders which have trans in one carrier to the other carrier, means for thereafter transferring selected needles from the second carrier to the ñrst carrier, means for con troliing sliders in the second carrier to cause needles therein to form selectively stitches of vary ing types, and means appurtenant to each of two feeding stations for preventing sliders which have transferred needles to the first carrier from being controlled by said means for causing the forma tion of stitches. î 5. A knitting machine comprising superposed needle carriers, sliders provided with butts and needles controlled by the sliders movable in said carriers, means for transferring all needles lo cated in one. carrier to the other carrier, means for thereafter transferring selected needles from the second carrier to the first carrier, means for controlling sliders in the second carrier to cause needles therein to form stitches, and means for presenting sliders which have transferred needles to the first carrier from being controlled by said means for causing the formation of stitches. ferred needles to the first carrier from being con trolled by said means for causing the formation of stitches- ~ I ' 10. A knitting machine comprising superposed needle carriers, double-ended needles mounted in said carriers, sliders in both carriers arranged to control movements of said needles, means "for transferring needles from sliders in one carrier to sliders in the other, means for retransferring needles from sliders in the second mentioned carrier to sliders in the first, means controlling sliders in the second carrier subsequent to the region of retransfer to cause needles controlled by them to form stitches, means controlling slid ers in Vthe first carrier subsequent to the region of retransfer to cause needles controlled by them to form stitches, said means for controlling slid ers in the second carrier selectively causing them to follow alternative paths to effect the forma-' tion of different types of stitches, and means for controlling those sliders in the second car 6. A knitting machine comprising superposed rier which have retransferred their needles so as needle carriers, sliders provided with butts and 25 to avoid action thereupon by the means for con needles controlled by the sliders movable in said trolling sliders in the second carrier to form carriers, means for transferring all needles lo stitches. cated in one carrier to the other carrier, means 11. A knitting machine comprising superposed y for thereafter transferring selected needles from needle carriers, double-ended needles mounted in the second carrier to the first carrier, means for 30 said carriers, slidersin'both carriers arranged to controlling sliders in the second carrier to cav-.se control movements of said needles, means for needles therein to form stitches, and means for transferring needles from sliders in one carrier preventing sliders which have transferred needles _ to sliders in the other, means for retransferring needles from sliders in the second mentioned means to the first for causing carrier the from formation being controlled of stitches, by thus carrier to sliders in the first, means controlling positioning said last named sliders to receive sliders in the second carrier subsequent to the needles from'the other carrier in a subsequent region of retransfer to cause needles controlled phase of knitting. by them to form stitches, means controlling slid 7. A knitting machine comprising superposed ers in the first carrier subsequent to the region needle carriers, sliders provided with butts and 40 of retransfer to cause needles controlled by them needles controlled by the sliders movable in said to form stitches, said means for controlling slid carriers, means for transferring all needles lo ers in the second carrier selectively causing cated in one carrier to the other carrier, means them to follow alternative paths to effect the for thereafter transferring selected needles from formation of different types of stitches and leav the second carrier to the first carrier, means for 45 ing them in alternative positions in` at least controlling sliders in the second carrier to cause one of which they would be incapable of receiv needles therein to form stitches, and means for ing needles in a transfer operation'and, means preventing sliders which have transferred needles for controlling those sliders in the second car-A to the first carrier from beingV controlled by said rier which have retransferred their needles so> means for causing the formation of stitches until 50 as to avoid action thereupon by the means for they have again become associated with needles. controlling sliders in the second’carrier to form 8. A knitting machine comprising superposed stitches. needle carriers, sliders provided With butts and 12.. A knitting machine comprising superposed needles controlled by the sliders movable in said needle carriers, double-ended needles mounted carriers, means for transferring all needles lo 55 in said carriers, sliders in both carriers .arranged cated in one carrier to the other carrier, means to control movements of said needles, means for for thereafter transferring selected needles from transferring needles from sliders in one carrier to the second carrier to the first carrier, means for sliders in the other,v means for retransfe'rring controlling sliders in the second carrier to cause needles from sliders in- the second mentioned needles therein to form stitches, and means ap 60 carrier to sliders in the first, means controlling purtenant to each of two feeding stations for sliders in the second carrier subsequent to the preventing sliders which have transferred nee region of retransfer to cause needles controlled dles to the first carrier from being controlled by by them to form stitches, said means for con said means for causing the formation of stitches. trolling sliders in the second carrier selectively 9. A knitting machine comprising superposed causing them to follow alternative paths to ef needle carriers, sliders provided With butts and fect the formation of different types of stitches, needles controlled by the sliders movable ‘in said and means-for controlling those sliders in the carriers, means for transferringV all needles lc second carrier which have retransferred their cated inone carrier to the other carrier, means needles so as to avoid actionthereupon by the for thereafter transferring selected needles from 70 means for controlling sliders in the second car the second carrier to the first carrier, means for rier to form stitches. K controlling sliders in the second carrier to cause 13. A knitting machine comprising superposed needles therein to form selectively stitches of needle carriers, double-ended needles mounted in varying types, and means including at least one said carriers, sliders in both carriers arranged to cam between the point of Yselective vtransfer and " control movements of said needles, means for' 2,412,248 17 transferring needles from sliders in one car rier to sliders in the other, means for retrans ferring needles from sliders in the second men tioned carrier to sliders in the iirst, means con. trolling sliders in the second carrier subsequent to the region of retransfer to cause needles con trolled by them to form stitches, said means for controlling sliders in the second carrier selec tively causing them to follow alternative paths to effect the formation of different types of stitches and leaving them in alternative posi tions in at least one of which they would be in capable of receiving needles in a, transfer opera tion, and means for controlling those sliders in the second carrier whiclrhave retransferred their needles so as to avoid action thereupon by the means for controlling sliders in the second car rier to form stitches. 14. A knitting machine comprising superposed needle carriers, double-ended needles mounted in said carriers, sliders in both carriers arranged to control movements of said needles, means for transferring needles from sliders in one carrier to sliders in the other, means for retransferring needles from sliders in the second mentioned car rier to sliders in the ñrst, means controlling slid ers in the second carrier subsequent to the re gion of retransfer to cause needles controlled by them to form stitches, said means for controlling sliders in the second carrier leaving them in a position in which they Would be incapable of re ceiving needles in a transfer operation, and means for controlling those sliders in the second carrier which have retransferred their needles so as to avoid action thereupon by the means for controlling sliders in the second carrier to form stitches. 18 needle carriers, double-ended needles mounted in said carriers, sliders in both carriers arranged to control movements of said needles, and a plural ity of successive control phases, each of said phases including means for transferring needles from sliders in one carrier to sliders in the other, means for retransferring needles from sliders in the second mentioned carrier to sliders in the first, means controlling sliders in the second car rier subsequent to the region of retransfer to cause needles controlled by them to form stitches, said means for controlling sliders in the second carrier selectively causing them to follow alter native paths to effect the formation of different types of stitches and leaving them in alternative positions in at least one of which they would be incapable of receiving needles in a subsequent , transfer operation, and vmeans for controlling Athose sliders in the second carrier which have retransferred their needles so as to avoid action thereupon by the means for controlling sliders in the second carrier to form stitches. 17. A knitting machine comprising superposed needle carriers, double-ended needles mounted in said carriers, sliders in both carriers arranged to control movements of said needles, means for effecting transfer of needles from sliders in one carrier to companion sliders in the other, the sliders in one carrier, when their companion nee dles are associated with sliders in the other car rier, not being retracted by a knitting cam, and supplemental means for reti-acting such sliders at the knitting point so that they Will not inter fer@ with the knitting of stitches by their com panion needles operating in the other carrier. 18. The method of controlling sliders in a knit ting machine comprising superposed needle car 15. A knitting machine comprising superposed riers, double-ended needles mounted therein, slid ers in both carriers for controlling the needles, needle carriers, double-ended needles mounted in said carriers, sliders in both carriers arranged to 40 and means for controlling sliders to transfer needles and cause needles to form stitches, which control movements of said needles, and a plu comprises causing empty sliders of one carrier rality of successive control phases, each of said to travel past the region of formation of stitches phases including means for transferring needles in a special path to insure their proper location from sliders in one carrier tol sliders in the other, to receive needles in a transfer operation. means for retransferring needles fom sliders in 19. The method of controlling sliders in a knit the second mentioned carrier to sliders in the ting machine comprising superposed needle car ñrst, means controlling sliders in the second car riers, double-ended needles mounted therein, slid rier` subsequent to the region of retransfer to ers in both carriers for controlling the needles, cause needles controlled by them to form stitches, and means for controlling sliders to transfer said means for controlling sliders in the second needles and cause needles to form stitches, which carrier leaving them in a position in which they comprises effecting selection of sliders to alter would be incapable of receiving needles in a sub native positions, and causing all empty sliders of sequent transfer operation, and means for con at least one of the carriers to occupy a position to trolling those sliders in the second carrier which have retransferred their needles so as to avoid action thereupon by the means for controlling sliders in the second carrier to form stitches. 16. A knitting machine comprising superposed _ receive needles at the location of transfer regard less of any previous selection of sliders. PAUL W. BRISTOW.