Патент USA US2407731код для вставки
Sept- 17,1946’ I -_c. HJWETHERSV . ROLLER FOR TWISTER MACHINE Filed June 15, 1945 2,407,730 ' 2,407,730 Patented Sept. 17,_ 1946 UNITED STAT Es 1‘, PATENT OFFICE ‘ 2,407,730 '- ‘ ‘ ROLLER FOB 'rwis'rm MACHINES '‘ I ‘ Cli?ord‘ H. Wethers, Detroit,‘Mich., ' ‘ ‘ ‘ Application June 15, 1945; Serial No. 599,583 4 Claims. (01. ave-9'0} r This invention relates to twister rolls such as are incorporated in the spinning heads of cotton and yarn spinning machines and has for its object to provide in a simple and practical man ner for the prevention of the‘yarn or material being twisted from becoming displaced‘for any material‘ length of time from the surface of its individual top twist roll‘ and to provide simple 2 apparent as the said invention is hereinafter'fur ther disclosed. . r e‘ , In carrying the said inventioninto effect, I may provide each individual upper twister roll of: a‘ spinner‘head‘ with projections extending‘ there from and on their outer surfaces form a‘ con tinuation of the normal peripheral rsurfacrellof the roll, said projections providing abutment sur faces on to which yarn may descend should it ‘means for returning the yarn to the roll‘ surface pass over one _or other end of the roll,where?by 10 should it momentarily slip over the end of the roll. ' . In such machines a number of short upper twist rolls are usually positioned in co-axial ar rangement separated by suitable bearings above a lower twist roll, generally of larger ‘diameter, such abutment surfaces will maintain‘ the ‘yarn inptemporary alignment with the outer, surfaces of the said projection for a su?icient length of time to permit one or other of the projections, as it rotates with the roll, to lift the yarn back to the level of the roll surface and thereby per mit it to travel back onto the roll as required. the yarn passing from the creel by way of a water trough over and vunder these upper twist All of ‘which is‘more particularly described and rolls, then between the upper twist rolls and the ascertained, by way of example, having'refer lower twist roll and partially around the lower‘ ence to the accompanying drawing, wherein: 20 twist roll to guides and thence through the ?yers Figure 1 is a perspective view of an improved to the bobbins on which the twist yarn is wound. upper twister roll embodying ‘the said invention; The action of the machine is such that the thread Figure 2 is a similar view of a somewhat modi or yarn passing around the said top twist roll ?ed form of the same; i ‘ ‘ wanders in the direction of the length of the Figure 3 is a front elevation showing upper and roll, toward and from the ends thereof, and it ‘lower twister‘ rolls in relative positions; and frequently happens that the yarn will travel too ‘ Figure 4 is an end elevation partly in section far and thus slip over the end ‘of the roll and ‘run on‘the smaller hub or bearing, thus upsetting Similar‘ characters of reference indicate simi the relationship of the yarn feed to the lower lar parts in the several‘ ?gures of vthe drawing.‘ twister roll and resulting in a- hard twist being 3 The twisting mechanism of a spinning machine imparted to the yarn where the mechanical set includes a lower twister roll l0 surmounted‘by‘a up was arranged to impart a soft twist thereto. series of upper twister rolls l I which; usually rest This is highly undesirable and its prevention is upon and are frictionally driven by the saidlower very important. . ‘ ' roll I0, except that yarn l2 fromthe 'creels (not The present invention, therefore, proposes to shown) passing over and under each roll ‘I lv‘and provide a form of upper twist roll which will between the said roll H and the roll it naturally’ automatically return the yarn to the periphery effect a spacing of the rolls II and It to the ex of the said roll with a minimum lapse of time tent of the thickness of the yarn. This yarn whenever the yarn should wander beyond the also passing partially around the roll II], which ends of the roll and. tend to fall onto the hub 40 is rotated by means well known in the art at a or bearing thereof; and, more particularly, the suitably determined speed, passes thence through‘ said invention has for its object to provide in guides l3 to the ?yers and bobbins (not shown) such a roll pick-up ?ngers ‘or projections at the thereby completing the spinning and winding of ends ‘thereof which will immediately intercept » the thread, technical details of which operation any thread or yarn attempting to drop over the need not be dwelt upon herein asthey are quite end of the said roll and will as a result imme old and well known in the art to which this in diately lift the thread to the level of the roll sur vention appertains. face whereupon it can'again travel over such sur The several rolls II are spaced apart in co face and between the upper and lower twister _ -: axial relation by bearing members l4, and, in the course of the yarn-twisting operation, itv often roll in the manner intended. happens that a length of yarn passing over the Still further objects or advantages additional roll ll and constantly changing location as to or subsidiary to the aforesaid objects, or resulting the length of the roll, by reason of the variable from the construction or operation of the inven manner in which the yarn approaches or leaves tion as it may be carried into e?ect, will become ofthe‘same. ‘ a‘ l i ' " ' - r 2,407,730 3 the said roll, passes beyond the extremities of the roll and-thus proceeds to travel around the hub I 5 or the bearing member [4. This upsets ' the feed relationship necessary for the mainte 4 the said projections I G as the roll continues to rotate, so that in any case the amount of time _ I elapsing before the yarn is eventually returned i to its correct running position will be very small. f nance of a constant twist being imparted to the The exact form of the yarn-lifting projections ' yarn, so that, as long as the condition 'exists or abutments may be varied within the limits of wherein the yarn is so displaced beyond the end reason; and, in Figure 2, I have shown the ends of the roll, a hard twist will result Where the of the roll as being slotted at l9 in a segmental rolls and twisting mechanism ‘are proportioned and intended to produce a, soft twist. If this 10 manner leaving a diametralrib 21B’ thereon pro viding lateral abutment surfaces 21,’ and oper slippage of the yarn from over the end of the ating in the manner of the abutment surfaces roll is not noticed and immediately corrected and ~ ' the incorrectly twisted yarn thus permitted to . 1.8 of the projections I6 previously described. The ends of the said diametral ribs 20 will thus nat wind to any extent on the bobbin, thread of an I uneven and inferior quality is the result. > urally be vav continuation of the peripheral surface .of the. roll. By my invention I automatically correct such ‘This invention maybe develop-ed within the scope ‘of the following claims without departing from the essential features of the said inven displacement of the yarn by providing on the; ends of the roll ll projections I6 which‘ I prefer. to make of arcuate form, as shown in Figure 1, with theirouter surfaces [1 being a ‘continua tion of the surface of the roll, the ends vof the said projection I 6 being in the form of abutments "l8 extending more or less along chords of the ‘ends of the roll. Thus the said abutments N3 of each projection l6 v‘are in materially spaced rela tion on opposite sides ‘of a radial planepassing ‘trough the abutment and the center'of'the twister-roll.‘ ' ' ' ' > ' ' " ‘The‘s‘erolls revolve 'quite rapidly and it will be ‘readily ‘apparent from an examination of Figure to tion, and it is desired that the speci?cation and drawing be read as being merely illustrative of a practical embodiment of the said ‘invention'and not in a strictly limiting sense. ' V WhatI claim is:" ' i ' 1. In a twister roll‘ of'the type described, pro-V jections extending endwise beyond the "normal ‘length of the‘roll, part of the surface of ‘such. pro jections being a continuity ‘of, the peripheral ‘sur face of the rolL'and thejspacing between said projections being uninterrupted ‘by the .roll proper. ‘ ' ‘ ' '4 that if yarn‘ should slip vover an end of the roll 2. In a twister roll of the type ‘described, pro-. . it, as indicated in dotted lines of the said Figure jections extending endwise' beyond the normal ‘4, it will be caught and held by one of the abut length of said roll, ‘said projections having lat ine'nt surfaces 18 ‘of one of the projections [6 in eral abutment surfaces arcuately extending ma such manner that, as the roll continues to rotate 135 terially ‘on either side of a radial plane passing theabutme‘nt surface I8 of the other projection through the center of the projection andthe cen on that end of the roll "will ‘engage beneath the I ' ter of the roll, and the spacing between said pro upper "extended length of ‘yarn whereby the con jections being uninterrupted by the roll proper. tinued movement 'of this projection I 6 will lift 3. Ina twister roll of the type described, pro the yarn back to the position shownv in full lines 740 jections eXtendlng endwise beyond the normal at the'top of the vsai'ol' Figure 4. length of the roll, the outer part of the ‘surface The outer surface of the said projection I6 of such projections being arcuate and a ‘continu is a continuation of the general peripheral sur ity of the peripheral surface of the roll, and the face of the roll so that it‘thereby encouragesthe spacing between said projections being ‘uninter ‘yarn .to resume its correct position running over 'rupted by the roll vproper. ~ the surface 'of?th’e roll. The winding motion of 4. In a twister roll of thetype described, pro the yarn'on ‘the roll ‘is such that'its tendency to jections extending endwise beyond the normal feed beyond the limits of the roll length is more length of said roll, said projections having lat or less‘momentary whereby this‘ quick lifting of eral abutment surfaces materially and uninter the-yarn back to the periphery of the roll will ruptedly spaced on either side of a radial plane usually su?ice‘ to immediately return'it to the .roll'. - r ‘ - - =In ‘relatively rare cases, where the yarn does passing through the'center of the projection and the center of the roll, the outer part ‘of the sur face ‘of such projections ‘being arcuate and ‘a not ‘immediately return to its ‘correct running continuity of the peripheral surface of‘the roll. ' position, it will again and again in rapid succes sionbe ‘subjected to the same lifting action by 55 CLIFFORD H. WETHER'VS’.