Патент USA US2408700код для вставки
Oct. 1, 1946. 2,408,698‘ 1 N. H. SMITH’ mun-Ins lmcnnm Am) METHOD 'oF mum-me Filed Oct. 21, 1944 ’ MJPMHH ‘ [Mm/Tar: 5H1]?! ' ' 2,408,698 Patented Oct. 1, 1946 UNITED STATES PATENT OFFICE KNITTING AND METHOD OF -‘ KNITTING assignor to Norman H. ‘Smith, Pawtucket, R. 1., R. 1.,- a cor-' Hemphill Company, Central Falls, poration of Massachusetts , I Application October 21, 1944, Serial No. 559,775 ' 4 Claims. 1 This invention relates to a new and useful im provement in knitting machines of the type hav ing two axially opposed needle cylinders and to a method of knitting upon this type of machine. More speci?cally, this invention relates to sinkers associated with the lower cylinder and adapted to cooperate with the needles in the drawing of (01. 66-14) quality of the fabric as a whole and of the indi vidual loops which- is very marked.’ 1 On‘e'form of the invention is shown‘ in the draw ing of which: Fig. 1 is an elevation largely in section of a part of a two cylinder knitting machine showing the upper end of the lower cylinder, a needle arranged to operate therein, a sinker and the sinker cam; yarns and to a novel manner of operating these Fig. 2 is a similar view showing the needle and sinkers to carry out the method. sinker in a different position; and Two cylinder machines of this type are widely 10 Figs. 3 and 4 are views illustrating the method employed for knitting true rib fabric and also of knitting in which the yarn is drawn over the knitting a combination of true rib and plain fab backs of the sinkers. ric. For the knitting of plain fabric the lower In Fig. 1 the upper end of the lower cylinder cylinder only is utilized and sinkers are asso is shown at l. Af?xed to this is an arcuate sinker ciated therewith to enable the needles to draw 15 guide 2 upon which an arcuate sinker 3 is adapted yarn and to knit loops. ' ' Heretofore the yarn has been drawn in the throats of the sinkers. The result of this is that when the sinkers move to cast off knitted loops to rock radially of the cylinder. The rocking of sinker 3 is controlled by a cam 4 having a cam track 5 of appropriate shape to rock sinker 3 in the desired directions and to the desired extent from the needles they necessarily act not only 20 at the desired times. upon the knitted loops but also upon the yarn In order to draw the yarn over the backs 6 of which has just been drawn. This yarn is com the sinkers the sinkers are moved in soon enough paratively unstable at this time so that any lack and far enough for the purpose. This is shown of uniformity in the sinkers or the needles or in in Fig. 1, the newly drawn sinker and needle their actual or relative motions is reflected in the 25 loops being indicated at l and 8, respectively. As lengths of the loops. Also there is likely to be a will be seen, the corresponding sinker loop 9 of lack of uniformity in the shapes of the loops, one the preceding course is in the throat of the sinker. side differing from the other or whole loops tilt Consequently, when the sinkers move in still fur ther to cast off the adjacent needle loop 10 it will ing from the perpendicular. By the method of'this invention the loops are 30 act upon sinker loop 9 only, the newly drawn sinker loop 1 upon the back 6 of the sinker being drawn over the backs of sinkers behind the nibs on a surface having a de?nite height. Thereafter unaffected. To insure that this motion of the g sinker has no effect upon loop l, back 6 is shaped the loops are transferred from the backs to the throats of the sinkers overthe tops of the nibs. 35 to an arc concentric with the are through which the sinker rocks. In this way, the casting off is accomplished by Fig. 2 shows a, further step in the knitting oper the sinkers acting upon the completed and com ation after the needle has risen again. The new paratively stable loops of the preceding course. needle loop 8 has now moved from the- hook to The newly drawn loops, being on the backs of the shank of the needle but the adjacent sinker the sinkers behind the nibs and able to move loop 1 is still over the back of the sinker. freely upon them, take no part in the casting off Fig. 3 also illustrates this condition, two sinker operation and are unaffected thereby. loops 1 being shown over the backs of two adja- . Also when the sinker loops pass over the ‘nibs on cent sinkers and around the shank of the inter their way to the throats of the sinkers they are vening needle H. Loops 9 are in the throats of stretched slightly so that the adjacent needle the sinkers, the needle loop [0 having been pre loops are tightened around the needles. This viously cast off. has an equalizing effect upon the needle loops. Fig. 4 illustrates a further step in the method of When the needles go down to knit the sinker loops knitting in which the ‘sinkers have been moved undergo a similar equalizing experience as the out so that the new sinker loops 1 have been 50 needle loops are stretched by their passage over transferred from the backs to the throats of the the enlargedportion of the needles adjacent the sinkers over the tops of the nibs prior to drawing latch pivots. ' more yarn over the backs of the sinkers for All of these things, particularly thecasting off another course. of needle loops by the action of the sinkers upon This method of knitting is hardly necessary for the sinker loops only, cause improvement in the 55 a, 2,408,698 4 the comparatively heavy coarse gauge fabrics ordinarily produced upon two cylinder inde pendent needle knitting machines but is practi cally essential for the production of ?ne gauge fabric of the highest grade and for securing the best possible plating and wrap patterns. Draw ing the yarns or yarn over the backs of the sink ers makes it possible to apply methods for plat ing and for the production of wrap patterns which cannot be taken advantage of when the throats of the sinkers are used and which are essential > to production of the highest quality. I claim: ' the adjacent sinker loops only and transferring the newly drawn loops from the backs to the throats of the sinkers over their nibs. 2. For a knitting machine of the superposed, co-axial cylinder, independent needle type, a sinker adapted to move in an arcuate path rela tive to the cylinders and having a yarn drawing surface behind the nib shaped to an arc concen tric with said path. 10 3. For a knitting machine of the superposed, coaxial cylinder needle type, a sinker adapted to swing about a center and having a yarn drawing surface behind the'nib shaped to an are con centric with said center. 15 4. For a knitting machine of the superposed, independently operated needles and sinkers each coaxial cylinder needle type, a sinker adapted to movable in an arcuate path relative to the cylin swing in a vertical plane about a center and hav ders and having a back shaped to an are con ing a yarn drawing surface behind the nib so centric with said path which includes the steps shaped that every point when positioned to be of drawing loops over backs of sinkers behind the contacted by a yarn will be at the same height nibs and through the corresponding needle loops 20 with respect to said cylinder. of a previous course casting o? the needle loops of the previous course by the sinkers acting upon 1. A method of knitting upon a knitting ma chine having opposed, axially aligned, cylinders NORMAN H. SMITH.