Патент USA US2405162код для вставки
Aug. 6, 1946. B. NYHUIS , } 2,45%2 KNITTING METHOD AND APPARATUS ' . Filed‘ Sept. 16, 1944 - ?erZ/Yy/uua, INVENTOIf. _ BY’ 0%) I ‘ g ' ‘ y” Patented Aug. 6,’ 1946 2,405,l62 UNITED STATES PATENT oFFIcE 2,405,162 KNITTING METHOD AND APPARATUS Bert Nyhuis, Kankakee, Ill., assignor to Bear Brand Hosiery (10., Chicago, 111., a corporation of Illinois 7 ‘ 1 Application September 16, 1944, Serial No. 5571,1198 9 Claims. (01. 66+“) 2 This invention relates to improvements in cir opposite side of the cylinder. ' This ba?‘le, by cular knitting machines and methods of knit ting and its purpose is to provide improved means for controlling the operation of such a machine by the application of air under pressure at the place where the stitches are formed. The inven tion may be employed with particular advantage to the air'jet, serves to direct the air down wardly into the pocket of fabric as it is formed so that this direction of the air current is a major . in the operation of-a circular knitting machine for producing seamless nylon hosiery having a double welt portion around the top. In the operation of a circular knitting machine to make the welt portion of a stocking, the ma chine starts on alternate. needles four courses of fabric and this fabric is then taken off of the nee dles. and held by transfer jacks while the needles continue their operation in the knitting of the re mainder of the fabric. When the knitting of the welt fabric has been completed, the needles are virtue. of its shape and its position with respect factor in preventing the distortion and forma tion of wrinkles which attend the making of the fabric where such air directing means is not used. By this method, the double welt fabric is pro gressively formed while maintaining the oppo site walls apart at the place of knitting and pre venting the opposed parts of the inner wall of the Welt from engaging each other at any time during the knitting operation. These and other 15 objects and advantages of the present invention will appear more fully hereinafter. The nature of the invention will be understood from the following speci?cation taken with the operated to remove the initial stitches from the accompanying drawing in which one embodiment transfer jacks and then to knit a seam which 20 of the invention is illustrated. In the drawing, completes the formation of the tubular top por the single ?gure shows a vertical axial section tion or welt. through the principal portions of the upper part . of a circular knitting machine embodying the The use of such a knitting machine in form ing the welt fabric has given rise to- difficulty when nylon yarn is employed because of the features of the present invention. As illustrated in the drawing, the invention is ' embodied in a circular knitting machine com prising a needle cylinder . l l! which is suitably sup tendency of the knitted fabric to bunch up and form a tangled mass as the knitting proceeds, with the result that distorted stitches and wrin kles are present invthe welt portion of the com pleted stocking, thereby giving it an unattrac tive appearance. This problem has been solved, to some extent, by the controlling method dis closed in the United istates patent to R. C. Wil ported for rotary movement about its vertical axis and which is rotated or oscillated as re 30 quired in the making of seamless stockings by suitable actuating mechanism not shown. Se cured, to the needle cylinder I!) is a sinker,ring ll carrying the web holders or sinkers l; which liams, No..2,275,276, dated March 3, 1942,, accord coact individually with the annular series of nee ing to which a jet of air under pl‘?ssure is directed 35 dles l3 carried by the cylinder [9 during the knit against the fabric as it is being formed, so that ting operation. The web holders I2 are slidably the fabric is projected inwardly within the needle mounted for radial movement and are actuated cylinder and held in an extended condition op by a cam groove lie formed in an annular cap posite the jet. This arrangement has not proved to be entirely satisfactory, however, because the 40 portion of the fabric which is extended by the jet tends to rub against the downwardly looped fabn'c at the opposite side of the needle cylin member 14 which rests upon the sinker ring H and carries adjustable stop screws adapted to engage a stationary post, not shown, for limiting its angular motion in either direction. The yarn feeding mechanism and other usual parts asso ciated with the needles and the web holders are upon itself and give rise to unsightly wrinkles (45 not illustrated since they do not in themselves and surface formations which are only less ob vconstitute parts of the present invention. jectionable than those produced in the operation The latch guard ring it of the machine carries of machines not equipped with the controlling an inwardly extending bracket [6 provided at its device of said patent. I ' inner end with a hub portion He in which is These difliculties have been overcome by the journaled, in axial alignment with the needle so present invention through the provision of im cylinder [0, a shaft having secured to the lower proved apparatus in which a jet of air under end thereof a circular dial I‘! having radial guide pressure, introduced in the knitting area between ways, in which are mounted the loop holding hook the needle cylinder and the hook carrying dial, members or transfer jacks l8 which cooperate is caused to carry the loop of knitted fabric 55 with alternate knitting’ needles l3 during ‘the against a depending annular ba?le or shield formation of an initial or set-up course for the der, thereby causing the suspended fabric to twist which extends downwardly from the rotary dial, so that the fabric which is extended by the air jet to keep its opposite layers apart is held by the intervening baf?e from engagement with the suspended loop or double layer of fabric at the ' stocking welt and also during the formation of the seam which ?nally closes the welt. The dial I‘! is rotated in unison with the needle cylinder l9 by suitable driving connections including ‘a shaft 19 having ?xed thereon a bevel pinion 2!) arranged 2,405,162 3 . 1. The method of controlling the formation of the stitches in a fabric knitted by a circular knit ting machine which consists in holding the fab to mesh with a bevel gear 2| fixed upon the upper end of the shaft which carries the dial. gAtjcer tain times during the rotation‘, the‘loop holding hooks l8 are actuated by retractable cams, not’ illustrated, carried by a cam plate 22 which is . ric by air under pressure against a baffle located on the inside of the circular fabric. mounted in fixed position, and in coaxial relation ship to the dial 11, upon the bracket l6. The the stitches in a fabric knitted by a circular knit _2., The method of controlling the formation of ting machine which consists in directing air un der pressure against the fabric as it is being times during the rotation of the needle cylinder 10 formed and de?ecting the air current to hold op as is usual in machines of this type. posed parts of the fabric out of contact with each At a point outwardly fromand somewhat above other. ' the stitching station shown at the upper ‘left 3. ‘The method of controlling the formation of side of the drawing, there is mounted a nozzle 25 the stitches in a tubular fabric knitted on a cir which is connected by apipe 26 with a source of cular knitting machine which consists ‘in direct compressed air or the. like and the. nozzle is ing. a current of air under pressure against the directe'dso that the air'or other gas under pres fabric as it is being formed and causing said cur sure is directed inaa‘ jet or stream to a point just rent to move axially of the tubular fabric to hold above the place where the stitches are formed by opposed portions thereof out of contact with the needles I3 and below the adjacent web holding each other. ' ~ hook or jack [8. This air jet passes through the 4. In a circular knitting machine having an gap between the ring H and the dial Hand. is ‘adapted to impinge upon the outer annular sur annular series of needles for knitting a tubular needles l3 are actuated by suitable cams at proper face 2711 of a circular baffle or shield 2‘! which is fabric, the combination of means for directing a current of air under pressure against said fabric as it is being formed to hold said fabric extend ed, and supporting means located on the inside of the annular fabric against which said fabric is 27*’ which extends around the lower end of the forced by said air current. In the operation of the machine, after the ini 5. In a circular knitting machine having an tial courses of thewelt fabric 30 have been formed 30 annular series of needles for knittingv a tubular by the knitting needles, theweb holding hooks is fabric, the combination of means for directing a are operated to take the fabric off of the needles current of air under pressure against said fabric ‘and to hold ‘the upper'edge'thereof as shown in as it is being formed to hold said fabric extend the drawing; As the knitting operation con ed, and a ba?ie mounted behind said fabric and secured to the under Side of the dial H in concen tric relationship thereto. The surface 21a tapers downwardly and unites with a'cylindrical surface balile. ' Y‘ - V. I V 1tinues', the length of the annular piece of fabric 35 adapted to de?ect said air current axially of the increases and itforms a progressively increasing double walled loop extending downwardly be- » tween the baffle 2-1 and the cylinder lil. During tubular fabric. 6. In a circular knitting machine having an annular series of needles for knitting a tubular this knitting operation the air jet from the nozzle fabric, the combination of means for directing a 25- carries the inner wall or layer of the fabric 40 current of air under pressure against said fab against the surface‘ 2'!a and the surface 21b of ~ ric as it is being formed to hold said fabric ex - the baffle so that the inner and-outer walls of tended, and a baffle against which said fabric is the welt are kept apart, in the region of the knit forced by said air current, said bailie having an ting'station. The air/jet is de?ected downwardly inclined surface arranged to de?ect said air cur from the surface 27*‘ and thus tends to hold the asii! rent axially of the tubular fabric. 'double'walled welt in concentric relationship to 7. Ina circular knitting machine having an the cylinder it] as its length increases and, in annular series of needles for knitting a tubular ‘addition, the presence of the baffle within the welt fabric,rthe combination of means‘for directing a fabric prevents the opposite portions of the inner current of air under pressure against said fab annular welt from contacting each‘ other as the 50 ric as it is being formed to hold said fabric ex dial rotates and the length of the welt increases. tended, and‘ an annular ba?ie positioned to be The objectionable twisting of the suspended welt within the forming tubular fabric with a part fabric upon itself is thus overcome. This effect thereof located in the path of travel of said air may be increased or regulated by varying the taper of the surface 213 and by varying the length 1 8. In a circular knitting machine having an of the cylindrical surface 21'’. The action of the annular series of needles for knitting a tubular current. air jet serves to maintain the welt extended and the stitches under tension in the stitching region so that a uniform product is obtained' Many ’ / of the advantages of the present invention may be obtained by using the ba?ie alone, without any fabric, the combination of means for directing a current of air under pressure against said fab no as it is being formed to hold said fabric ex tended, and a ba?ie positioned to be within the forming fabric and having a downwardly con air current, in which case this member serves merely as a shield to separate the opposed por verging annular surface against which said fab ric is forced by said air currrent. tions of the inner wal lof fabric.‘ When the length 9. In a' circular knitting machine having an annular series of needles for knitting a tubular fabric, the combination of means for directing a current of air under pressure against said fabric as it is being formed to hold said fabric extend of the welt fabric has increased to the desired extent, the upper edge of the fabric is removed from the hooks l8 and united with the outer por tion of the fabric to form the completed welt. One form of the invention has been shown and l -' described by way of illustration, but v'it'will be understood that it may be constructed in varie ous other embodiments, and that the improved method may be practiced in various ways, which come within the scope of the appended claims. , I claim: ‘ . ed, -a- b'a?ie positioned to be within the forming fabric and having a downwardly converging an nular surface against which said fabric is forced by. said air current, said baflie also having a cy lindrical surface extending downwardly from said ?rstfnamed surface. ' ' ‘ , _ _> BERT NY I-IUIS.