IL44891A - Method and apparatus for texturing continuous filament yarn - Google Patents

Description

P METHOD AND APPARATUS FOR TEXTURING CONTINUOUS FILAMENT ABSTRACT OF THE DISCLOSURE A method and apparatus for texturing continuous filament yarn wherein the yarn is fed at a controlled rate and under controlled tension into a confined crimping zone against a mass of crimped yarn therein causing the yarn to collapse longitudinally crimps which become part of such Heat and are applied to the yarn mass the crimping zone to plastically deform the yarn and partially set the The crimped yarn mass is then fed at a controlled rate from the crimping zone into a setting Heat and pressure are applied to the yarn mass in the setting zone to fully the The pressure applied to the yarn mass in the setting zone is substantially only sufficient to keep the crimps closed during the final setting The crimped yarn mass is then fed from the setting zone into a cooling The yarn mass is cooled in cooling zone to a temperature below that at which the yarn undergoes any molecular structural alteration in the absence of the application of a substantial force the yarn is withdrawn at a controlled rate from the cooling zone in continuous filament form OF INVENTION Field of continuous filament and in particular to a method and apparatus which is efficacious for crimping continuous filament polyester Description of the Prior Art Several methods of texturing continuous filament polyester yarn presently are The methods which have achieved the widest success are those in which the yarn is textured by imparting an artificial or false twist The quality and uniformity of the textured yarn product produced by such methods vary and production rates are limited to the texturing of approximately 200 yards per minute at each texturing The texturing of continuous filament yarns by imparting longitudinal crimps thereto also has been widely for yarns other than polyester and particularly for texturing nylon the prior art methods of crimping continuous filament yarns and particularly in a stuffer crimper apparatus largely have been unsuccessful for crimping polyester This failure results primarily from the different characteristics inherent in nylon and polyester In the stuffer crimping methods presently used commercially for crimping nylon a mass of crimped yarn in the form of a crimped yarn core is fed under pressure through a relatively long crimping tube in significant frictional forces are exerted on the core by the walls of the Nylon due to its particula moves at a substantially uniform rate through the crimping even when subjected to substant ial frictional j polyester due to its different does not move through crimping tube at a ate but tends to move in resulting in undesirable variations in the characteristics of the crimped SUMMARY OF THE INVENTION The method and apparatus of the present invention obviate the difficulties associated with use of the prior art stuffer crimper methods and apparatus for crimping polyester and may be used ly for crimping other continuous filament such as nylon Basically the method of the invention feeding continuous filament yarn at a controlled rate and under tension into a confined crimping zone against a mass of crimped yarn therein causin the yarn to collapse longitudinally and fold over forming crimps which become part of the applying heat and pressure to the mass in the crimping zone to plastically deform the yarn and partially set the feeding the mass at a controlled rate from the crimping zone to a settin applying heat and pressure to the mass in the setting zone to fully set the the pressure applied to the mass in the setting zon e bein substantially only sufficient to keep the crimps closed during the setting feeding the mass from the setting zone to a cooling zone after the crimps have been fully cooling the mass in the cooling to a temperature below the temperature at which the yarn undergoes molecular structural alteration in the absence of the application of stantial force and withdrawing the yarn at a in continuous filament form from the cooling Basically the apparatus of the invention is a stuffer crimper a a crimping chamber secured to and having a channel extending means for heating a of opposed feed rolls rotatably mounted on the housing adjacent c end of the chamber for arn into the chamber at one crimp control roll rotatably mounted on the housing and extending into the chamber the portion of the channel between the feed rolls and The pncssure applied to the crimped yarn core is a function of relative rotational velocities of the feed rolls and the crimp control it has been found that such pressure also is a function of the rate at which the crimped yarn core moves through the crimping as the rate at which the core moves through the crimping zone is increased for a particular ratio of feed roll velocity to crimp control roll the pressure applied to the core decreases and therefore the bulk of the crimped yarn also In both the crimping and setting the crimped yarn core is heated to a temperature below the liquefaction temperature of the The time of residence of the core in the crimping zone is substantiall less than the time of residence of the core in the setting and cooling and in the latter two zones the frictional forces applied to the core are In the preferred embodiment of the apparatus of the the channel in the crimping chamber has a substantially rectangular transverse the cross width of the channel should be as small as and ideally approximately equal to the diameter of the both structural and operational factors limit the minimum cross width of the For for wearing apparel the cross width of must be at least approximately 10 The preferred embodiment of the apparatus also includes means for feeding yarn into the nip between the feed rolls with a traversing axially of the feed rolls under controlled and means for controlling the relative feed and withdrawal rates of yarn into and from the in the preferred of the a short portion of the channel in the crimping chamber adjacent the feed rolls has a substantially elliptical transverse This feature in combination with the traversing yarn feed to the feed rolls results in the formation of a uniformily crimped yarn core in the crimping The preferred embodiment of the apparatus further includes a slug which rides freely on the top of yarn core in the cooling The slug has a channel therethrough through which the yarn is withdrawn in continuou filament form from the cooling The slug also has a particular external configuration which facilitates withdrawal of the yarn in a stantially the foregoing in it is an object of the present invention to provide an improved method and apparatus for texturing continuous filament and particularly polyester It is a further object of the invention to provide an improved method and apparatus for texturing continuous filament yarn by crimping such is also an object of the invention to provide an improved method and apparatus for crimping continuous filament yarn which achieve a high degree of crimp uniformity and which are operable at yarn feed speeds of approximately 000 yards per minute per crimping It is additional object of the invention to provide a method and apparatus for crimping continuous filament yarn in which a high degree of control may be exercised over the bulk of the crimped yarn product These and other objects of the invention will become apparent ί upon a consideration of the detailed description of the preferred embodiment of the method and apparatus thereof given in connection with the following wherein like reference numerals identify like elements BR IEF DESCRIPTION OF THE DRAWINGS 1 is a side elevational view of a preferred embodiment of stuffer crimper apparatus of the 1A is a perspective view of a detail of the apparatus shown in 2 is a front elevational view of the apparatus shown in 3 is a sectional view of the apparatus shown 4 is a sectional view taken on line of 5 is a sectional view taken on line of 6 is a sectional view taken on line 6 of 6A is a sectional view taken on line 6A of 7 is a sectional view taken on line of 8 is a front elevational view of the crimping chamber of apparatus shown in 9 is a sectional view taken on line 9 of 10 is a sectional view taken on line of 11 is a sectional view taken on line 1 of 12 is a layout view of the surface of the cam of the feed ing means shown in 13 is a s ide elevational view of a second embodiment of a yarn feeding means which may be employed in the apparatus shown in 14 is a sectional view taken on line of 15 is a sectional view taken on line 15 of 16 is a sectional view taken on line 16 of 17 is a perspective view of the slug employed in the apparatus shown in and 18 is an enlarged sectional view of a portion of the apparatus shown in DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the apparatus of the invention is a stuffed crimper designated generally by reference numeral Crimper 10 includes a rear stationar housing member 12 1 and 3 which is secured to a frame 14 by bolts or other suitable A front housing member 18 is pivotally connected to rear housing member 12 by a shaft Shaft 20 is secured to front housing member 18 by set screws 22 and is journalled for rotation in a pair of extensions 24 forming the front upper portion of rear housing member Mounted between housing members 12 and 18 is a crimping chamber 2G comprising front and rear longitudinally mated halves 28 and I 3 and 0 Chamber halves 28 and 30 are from a metallic i material having relatively high heat such as an alloy of j and are secured together by a plurality of friction fitted pins i 32 and bolls Assembled chamber 26 is secured to rear housing member inserted through openings 37 in chamber halves 20 and 30 which have a slightly larger diameter than the bolts for a purpose described Chamber halves 28 and 30 define therebetween an elongated channel 36 which extends completely through the A short portion of channel 36 at the lower end thereof has a generally elliptical transverse 6A and the remaining portion of the channel has a substantially rectangular transverse A pair of opposed feed rolls 38 and 40 are journalled in housing members 18 and adjacent the lower end of chamber 26 and define a nip The lower end of the chamber defines a saddle 42 which fits closely about the peripheries of the feed rolls from slightly below to above the nip therebetween Saddle 42 includes a pair of arcuate surfaces 44 and 46 machined on chamber halves 28 and which fit closely about the circumferential peripheries of rolls 38 and saddle 42 includes opposed end surfaces 48 and 50 6 and machined halves 28 and 30 which fit closely about the axial peripheries of rolls 38 and A felt pad 52 is mounted at the upper end of of arcuate surfaces 44 and 46 and extends outwardly from the associated surface into contacting engagement with the associated rolls 38 and A pair of elongated electrical heating elements 53 and 55 5 and are inserted in the upper portions of chamber halves 28 and and extend parall el to channel Another electrical heating element 57 may be inserted in the lower portion of chamber half 30 and extends transversely of channel Rolls 38 and 40 arc machined as integral portions of shafts 54 and respect 3 and Shaft 54 is journalled in bearings 58 mounted in front housing member and shaft 56 is journalled in bearings 60 mounted in rear housing member The outer races of bearings 58 are accommodated in recesses 62 machined in front housing member 18 and are locked in position therein by bearing retainers Retainers 64 are secured housing member 18 by bolts 66 the outer races of bearings 60 are accommodated in recesses 68 formed in rear housing member 12 and are locked position therein by bearing retainers Retainers 70 are secured to housing member 12 by bolts 72 gear 74 is affixed to end shaft 54 and a similar gear 76 is aff to the same end of shaft a pulley 78 is affixed to the end of shaft 56 opposite gear The ends of shafts 54 and 56 are threaded and the shafts are axially locked in position with respect to bearings 58 and 60 by nuts 80 and spacers 81 A pair of opposed crimp control rolls 82 and also journalled in housing members 18 and about axes parallel to the axes of feed rolls 38 and In the preferred embodiment of the apparatus of the the crimp control rolls have textured surfaces formed by teeth and are machined as integral portions of shaits 86 and 3 and Rolls 82 and 84 are within arcuate openings machined in chamber halves 28 and respectivel with the peripheries of the rolls being spaced apart within channel as shown by reference numeral Shaft 86 is journalled in bushings 92 which are accommodated in recesses 94 machined in front housing member Bushings 92 are locked in position by retainers 96 which secured to housing member 18 by bolts 98 1 Similarly shaft is in bushings 200 which are accommodated in recess 202 machined in rear housing member Bushings 100 are locked in position by retainers 104 which are secured to housing member 12 by suitable holts A 106 7 is affixed to one end of shaft 86 and a similar 108 is affixed to the same end of shaft Also0 a pulley is affixed to the same end of shaft 88 as gear outwardly of the Shafts 86 and 88 are axially locked in position with respect to bushings and 100 by spring clips 110 and clamps When front housing member 18 is pivoted rearwardly about the axis of shaft 20 to the positio shown in solid lines in gear with gear 76 and gear 106 meashes with gear the periphery of feed roll contacts the circumferential periphery of feed roll 40 forming a nip The teeth of gear s 106 are elongated sufficiently to insure that the gears will mesh properly the feed rolls are in contact with each Crimper 10 also includes means for urging front housing 18 rearward toward rear housing member Such means include a frame which is affixed to front housing member 18 by bolts other suitable fasteners Frame 118 extends downwardly and inwardly from the lower end of housing member 18 1 and and a handle A flexible cable 124 extends through the back of handle 122 i slidably connected thereto by a disc 126 affixed to the end of the cable 1A Cable 124 passes around a pulley and a wight 130 is affixed to the other end Pulley 128 is mounted on a shaft 132 which is journalled in a pair of arms 134 affixed to frame A ffixed to the lower end of frame 118 are a pair of horizontally aligned pins 136 which are adapted to register with and engage a pair of openings 138 in the back of handle As will be when pins are engaged with openings weight via cable urges frame 118 and front housing member 18 rearwardly toward rear member thus insuring that the circumferential periphery of feed 38 contacts the circumferential periphery of feed roll 1 j 2 When it is desired to pivot front housing member 18 away from rear housing member as 122 is pulled outwardly so th releasing frame For a pair of pins 140 similar to pins 136 are affixed to frame 14 and are adapted to register with openings 138 to hold handle 122 against the frame in the position shown in phantom lines in 1 when housing member 18 is pivoted away from housing Crimper 10 further includes means mounted below feed rolls 38 40 for feeding yarn to the nip between the feed The yarn feeding i means split cam 142 10 and 1 Cam 142 comprises a pair of axially cylindrical yarn guiding members 144 and 146 which affixed res ectivel to a air of circular flan es and Flanges 148 and 150 are mounted on a shaft 152 having an enlarged cylindric central portion Flanges 148 and 150 accommodate the ends of enlarged shaft portion and are connected together by a plurality of spaced rods The ends of rods 156 are threaded and receive nuts 158 thereon which lock flanges 148 and 150 onto shaft Guiding member 144 and 146 define a helical slot 160 therebetween through which yarn is fed to feed rolls 38 and 40 as described Shaft 152 is journalled about an axis parallel to the axes of feed rolls 38 and 40 in bushings 162 which are accommodated in a pair of arms 164 affixed to frame Bushings 162 are locked in position by retainers 166 which are secured to arms 164 by bolts 168 1 and Also mounted on shaft 152 and interposed between flange 150 and the adjacent bushing 162 is a pulley A pair of pulleys and 174 are mounted on a shaft 176 which is journalled about an axis parallel the axes of feed 38 and 40 in bushings Bushings 178 are accommodated in a pair arms 180 affixed to frame and are locked in position by 182 which are secured to arms 180 by bolts A belt 186 is trained 170 and 172 so that feed rolls 38 and 40 are driven in synchronism with cam belt 188 is ii trained about pulley 174 a pulley connected to an appropriate driving means such as an electric for driving feed rolls 38 and 40 and cam A belt 190 is about pulley 114 and a pulley 192 affixed to i drivingly connected to transmission 194 for rotating crimp control 82 and Appropriate openings are formed in frame 14 to permit passage of cable and belts 186 and 190 Crimper 10 further includes a cooling tower 196 and affixed to the upper end of crimping chamber Tower c prises a pair of halves 198 and 200 which channel 202 Channel 202 is vertically aligned with chamber Members 198 and 200 are connected together at the ends thereof and to flanges 206 by bolts Flanges are secured to the upper end of chamber 26 by bolts A extending trasverse opening 210 is in the side of and 200 to permit a such as compressed to be into and through tower Δ slug 212 rides freely in the upper end of channel 202 of a core of crimped yarn The formation of the core movement thereof through crimper 10 described Slug 212 has an upper parallelepiped shaped portion 214 and a generally pyramidal shaped portion Lower portion pair of members 218 and 220 which extend downwardly and wardly at opposite sides Members 218 and 220 extend downwardly slightly below the central section of the lower end of portion A channel 222 having an elliptically shaped trasverse extends longitudinally through slug purpose described A case is mounted on the s ide of member 198 adjacent the upper end A plurality of bolts 228 extend through case 226 and member 198 and are threadably received by member and thereby secure the case to member 198 and connect members 198 and 200 together at the upper ends Mounted within case 226 are four vertically magnetically sensitive reed switches 234 and i Member 198 has a longitudinally extending transverse opening 238 therein adjacent switches 234 and As slug 212 moves ly upwardly and downwardly with the upper end of the core of crimped magnet 224 moves into and out of proximity with switches 234 and and selectively closes and opens the Electrical j leads 244 and 246 connect switches 234 and to various electrical circuits to control the operation of crimper 10 j as described j Crimper 10 is constructed in such a manner as to facilitate the j j proper alignment of feed rolls 33 and 40 with each other and with saddle During the manufacture of the channel 36 is machined in Ί chamber half 28 and chamber halves 28 and 30 are then connected j together by pins 32 and bolts Saddle 42 is then machined at the lower end of assembled chamber A plurality of such as studs are inserted in the rear side of chamber 26 and project outwardly i A t least two of studs 248 on the left side of the chamber as seen in define a line parallel to channel The diameter of the studs is accurately such ends and the wall of channel 3G is The inner surfaces of rear housing member 12 include vertical machined surfaces 250 and Surfaces 250 and 252 are perpendicular to each other and define a pair of reference planes which contact studs 248 to properly position chamber 26 transversely and with respect to rear housing member As shown in 4 and 5 this result is achieved by placing the two studs 248 on the left side of chamber 26 as seen in 5 against surface 250 and the ends of the studs against surface The distance between surface and the journals for shaft 20 in extensions 24 of rear housing member 12 also is carefully determined so that shaft 20 is accurately positioned with respect to reference In this front housing member 18 is accurately positioned with respect to rear housing member bearing recesses 62 and 68 and bushing recesses 94 and 102 are accurately machined with respect to the position of shaft this feed rolls 38 and 40 and crimp control rolls 82 and 84 are accurately positioned with respect to each During assembly of crimper chamber 26 is first connected to rear housing member 12 by bolts 35 which initially are not securely Front housing member 18 is then connected to rear housing member 12 by shaft Bearings 58 and 60 and bushings 92 mounted in recesses 94 and Feed rolls 38 and i 40 and control rolls 82 and 84 arc then adjusted axially with respect to saddle and retainers 64 and and 96 and 104 are secured to respective housing members to lock the feed and crimp control rolls in chamber 26 is adjusted longitudinally with respect to feed rolls 38 and 40 to provide the proper clearance between the feed rolls and saddle and bolts 35 are tightened to secure 26 to rear housing member A second embodiment of a yarn feeding means which may be ed with crimper 10 is shown in Figs 13 and 14 and comprises a cam Cam 300 includes a pair of axially and circumferentially o generally guiding members 302 and Member 302 defines a helical yarn guiding surface and member 304 defines guiding surface 308 which is axially and circumferentially opposed to surface 306 Members 302 and 304 are affixed to shaft 152 by a plurality of threaded rods 310 and nuts Axially interposed between members 302 and 304 is a generally elliptically shaped cam 3 14 which is secured about enlarged shaft portion 154 by rods 3 As shown in guiding members 302 and 304 overlap slightly with member 302 having a leading edge finger and member 304 having a leading edge finger The function of surfaces 30G and 30S and cam 3 14 is described The method of the invention will now be described in detail with reference to crimper Continuous filament yarn 320 is fed fro a spool of such yarn or other source of yarn supply through a conventional tension control mechanism 322 1 upwardly into slot 160 of cam Slot 160 guides the yarn into the nip between feed rolls 38 and 40 with a l order to obtain uniform feeding of the yara into the with respect to yarn quantity and it is necessary that of a controlled magnitude be applied to the yarn between mechansim 322 and feed rolls 38 and a conventional preheater 325 may be interposed mechanism 322 and cam 142 to preheat 320 prior to the it has been found desirable to preheat yarn heavier than two denier per Preheating softens the yarn and facilitates the crimping the yarn passes through cam it contacts rods 156 as in I Rods 156 are polished so that friction between the and the yarn is minimizedo Should the yarn break within cam 142 and wrapped around rods it is much simpler to untangle the j such rods than it is from around a continuous groove or In to permit easy access to the interior of cam flanges 148 and 150 i j have openings 324 and 326 j A s shown most clearly in as slot 160 traverses back and forth axially of the feed the yarn is fed by the feed rolls into channel 36 in a substantially uniform manner back and forth across the cross dimension of parallel to the axes of the the length of the j If the yarn feeding means comprising split cam be substituted for the feeding means comprising cam As the is fed through cam it rides on elliptical cam 314 and is traversed back and forth axially of the feed rolls by guiding surfaces 306 and same manner as it is traversed slot 160 of cam Elliptical 314 is designed such that the length of yarn between such between feed rolls 38 and 40 remains substantially constant of cam 314 along the long axis thereof engage the as it is fed the of the feed and the portions of the cam short thereof engage the yarn as it is fed through the end the feed rollso This arrangement insures that the yarn will not slack at any point as it is traversed axially of the feed guiding members 302 and encompass only slightly greater half of the circumference of cam access to the yarn in the means is greatly Immediately after passage between the feed is against a mass of crimped yarn in the form of a core of crimped in the lower end of channel causing the yarn to collapse longitudinally and fold over forming crimps which become part of the c The generally elliptical transverse configuration lower portion of channel 36 minimizes voids in the channel in me immediately above the feed rolls so that a substantially uniform pressure will be applied to the yarn after it passes between the The portion of channel 36 between feed rolls 38 and 40 and crimp rolls 82 and 84 comprises a crimping zone in which the yarn The crimp control rolls effectively isolate the crimping the portion of channel By controlling the relative velocities of the feed rolls and crimp control the back for a of a particular increase in the force results in a decrease in the leg length of the crimps and in the bulk of the crimped The crimping force may be i decreasing the rotational velocity of crimp control rolls 82 and respect to the rotational velocity of feed rolls 38 and The crimped and plastically deformed in the crimping heat and pressure applied to and the time of residence in the crimping zone is insufficient to cause the yarn to be set and in the absence of pressure on the core the crimps will after passage through the crimping for it is desirable that the residence time of the yarn in the relatively short to minimize the effects of friction the formation i and the distance between feed rolls 38 and 40 control rolls 82 and 84 along channel 36 is relatively This ment facilitates accurate control of the conditions within with the fractional forces exerted on the yarn by the walls of in the crimping zone having little or no effect on desirably the dimension of channel direction perpendicular to the axes of feed rolls 38 and the sectional width of the should be as small as possible to uniform heat transfer from chamber 26 to and through core the cross width of channel 36 should be approximately the diameter of yarn at least two factors the of the as the cross walls of the channel which extend in the direction parallel to the feed axes and respective arcuate surfaces 44 and 46 also is decreased 1 such angle is made too the adjacent portion of saddle 42 does nc possess sufficient strength to withstand the pressure exerted t by without deforming or fracturing as such angle the apex thereof necessarily is moved downwardly the nip between feed rolls 38 and If the apex of the angle is close to the nip between the feed as yarn 320 is fed through the the yarn will tend to move under 44 and 46 between suck and feed rolls 38 and 40 rather than into channel Due to these it has been found that an angle which is defined between ihe projection of of the side walls of the channel which extend in direction parallel to the feed roll axes and a plane tangent to the feed roll must be at approximately 23 as shown in in 18 and identified as angle is identical to the angle defined by such walls and surfaces 44 and in the preferred embodiment of crimper angle is approximately as shown in solid lines in 18 and as angle it has been found the cross width cf 36 in relation to the cross area of yarn has an important effect on the operation of the For for 150 the ratio of the width channel in inches to the yarn denier should be in the range of a to about the area of the yarn of 001 to about If the width of channel 36 is reduced below amount required to satisfy the range of values for such the yarn will tend to move under surfaces 44 and 46 between such surfaces and feed rolls and For yarn having a denier in the range of the cross width of the channel should be in the range of from about inch to about and preferably is about 16 Felt pads prevent yarn 320 from moving out of the crimper between feed rolls 38 and 40 and arcuate surfaces 44 and and particularly during of the crimper before core 328 fills the crimping Crimp control rolls 82 and 84 feed core 328 upwardly out of the zone and past such rolls into the portion of channel 36 above the crimp control The portion of channel 36 which extends between crimp control rolls 82 and 84 and the upper end of chamber 26 comprises a setting zone in which the core is subjected to heating and pressu e only sufficient to keep the crimps formed in the crimping zone The only pressure exerted on the core in the setting zone is the weight of the core itself and the relatively light weight of slug 212 which rides on the upper end In the setting the yarn is fully Due to the relatively small amount of pressure exerted on the core in the setting the fractional forces applied thereto in such zone are This is particularly important in the crimping of polyester yarn due to the undcrsir able effects which relatively frictional forces have on the crimping than the speed required tb withdraw the yarn from tower at the same rate at which it is fed into the the upper end of core 238 and slug 212 gradually move downwardly until magnet 224 moves i to proximity with switch 234 closing such switch and permitting switch 232 to When switch 234 is the winder is driven at a speed less than the aforementioned predetermined for at of the predetermined At such lower speed the winder draws yarn at a rate slightly less than that at which it is fed into tower the upper end of the core a d slug 212 move upwardly until magnet 224 again moves into proximity with switch 232 closing such switch and permitting switch 234 to again causing the winder to operate at of the predetermined In this the upper end of core and the slug move upwardly and downwardly continuously a distance approximately equal to the distance between switches 232 and thus maintaining the upper end of the within a predetermined The foregoing method is particularly efficacious for crimping polyester yarn due to the substantial elimination of the of fractional forces on the core of crimped yarn as such core moves through crimper and is advantageous for crimping other continuous filament such nylon While the foregoing constitutes a detailed description preferr d embodiment of the method and apparatus of the it is that modificat ions thereof will occur to those skilled in the the scope of the invention is to be limited solely by the scope of insufficientOCRQuality

Claims (1)

1. WE CLAIM . t '· * l i · · ! i · ·: i | I, A stuffer crimper' for crimping continuous filament yarn j comprising a housing; a crimping chamber secured to said housing and havin I 1 M a channel extending therethrough; means for heating said chambers a pair i ! ■ j j of opposed feed rolls rotatably mounted on said housing adjacent one en of the said chamber for feeding yarn into said chamber channel; and means for rotatably driving said pair of feed rolls at the same rotational velocity; characterized by at least one crimp control roll rotatably mounted on said housing and extending into said chamber channel, the portion of said chai__ie . between the feed rolls and the crimp control roll defining a confined eK?™p i. zone, whereby continuous filament' arn is fed into said crimping zone by the feed rolls against a core of crimped yarn therein causing the yarn to collapse longitudinally and fold over forming crimps which become part of said core, the crimp control roll being spaced from the feed rolls along , said channel a distance no greater than the distance required for the yarn to be plastically deformed and partially set in said crimping zone, the portion of said channel between the crimp control roll and the end of the chamber opposite the feed rolls defining a setting zone, whereby said cove is fed into the setting zone by the crimp control roll and the yarn is full set therein; and means for rotatably driving said crimp control roll independently of said feed rolls, \vhereby the pressure on the crimped yarn core in said crimping zone may be controlled by regulating the relative I rotational velocities of the feed rolls and the crimp control roll. ' 2. A staffer crimper as recited in claim 1 further characterized by i a pair of opposed crimp control rolls, the peripheries of said crimp control ; rolls being spaced apart within said chamber channel; and wherein said j crimp control roll driving means drives said pair of crimp control rolls v, ; the same rotational velocity 0 j 3. A stuffer crimper as recited in claim 1 further characterized in that said chamber channel has a substantially rectangular transverse crcae** j section. · · ! ·· · j / . - 4. A stuffer crimper as recited in claim 3, further characterize;! J in that said chamber channel adjacent said feed rolls has a generally - elliptical transverse cross-section. . ' ·.' . ' ' . . 5. A stuffer crimper as recited in claim 3, further characterized in that the longest dimension of said cross-section extends axially of said feed rolls. 6, A stuffer crimper as recited in claim 3, further characterized j in that the long cross- sectional dimension of said channel extend parallel to the rational ax£s of said feed rolls and t /he short cross- sectional , dimension; of said channel extend perpendicular to said axes, the ratio of said short cross -sectional dimension- in inches to the denier of said yarn being in the range of from about 0. 000667 to about 0. 00425. 7 o A stuffer crimper as recited in claim 6 further characterized in that said short cross-sectional dimension is in the range of frpm about 0. 100 inch to about 0. 170 inch. 8. A stuffer crimper as recited in claim 3, further characterized in that the long cross- sectional dimension of said channel extend parallel to the rotational axes of said feed rolls and the short cross- sectional dimensicn of said channel extend perpendicular to said axes., said chamber defining a saddle at said one end including two arcuate surfaces closely spaced about a portion of the circumferential peripheries of said respective feed rolls, each of said arcuate surfaces intersecting a side wall of said channel, said side walls extending parallel to said feed roll axes, the angle defined i betwee the plane of each of said side walls and a plane tangent to the adjacent feed roll being in the range of about 23 ° to about 29 °. , j 9. A stuffer crimper as recited in claim 1, wherein said crimp , [ control roll is mounted for rotation about an axis parallel to the axes of ; 5 . - 1 said feed rolls. ' ; I.0, A stuffer crimper as recited in claim 1, further characterized by means for feeding yarn to said feed rolls and traversing the yarn axially thereof. ' II, A stuffer crimper as recited in claim 10, further characterised in that said feeding means comprises a rotatably mounted cam having a helical slot therein, said cam being mounted for rotation about an axis parallel to the axes of sa id feed rolls. (- . 1 12. A stuffer crimper as recited in claim 11, further characterised , -·., · ·· ' i , in that said cam comprises a pair of axially opposed guiding members each \ ' · · defining. one side of said slot. . , ■ I 13. A stuffer crimper as recited in claim 12, further characterised in that said guiding members are connected together b a pluralit of rods, 14. A siuffcr crimper as recited in claim 13, further characterized in that said feeding means comprises a pair of circumferentially and axially opposed guiding members each defining a yarn guiding surface, said members being connected together and mounted for rotation about an axis parallel to the axes of said feed rolls. 15. A stuffer crimper as recited in claim 14, further characterized by a generally ellipitically shaped cam axially interposed between ∑>aid guiding members, whereby the yarn rides on said cam as the yarn is fed Jbetween the guiding members; and wherein the portions of said cam along the lon axis thereof engage the yarn as the yarn is fed through the midporti a of the feed rolls and the portions of said cam along the short axis thereof engage the yarn as the yarn is fed through the end portions of the feed rolls, whereby the length of yarn between the feeding means and the feed, rolls is. maintained substantially constant. 16. A stuffer crimper as recited in claim 1 further characterized in that said housing has at least two perpendicularly oriented reference surfaces thereon; said crimping chamber has at least two members projecting from said channel, said members defining a line parallel to said channel and the outer ends thereof being the same distance from a wall of said * channel, said members contacting said housing reference surfaces for · j accurately positioning said chamber with respect to sai'd housing along two perpendicular axes; and means- re provided for securing said chamber to said housing for adjustment along an axis perpendicular ;to said two axes. ;' 17. A staffer crimper as recited in claim 16, further characterized in that wherein said housing comprises a front housing member and a rear i t housing member, said front member being movably connected to said rear \ i j member; and wherein said housing reference surfaces are on said rear j I N housing member. j 18. A stuffer crimper as recited in claim 1, further characterized 11 by a cooling tower affixed at One end thereof to said chamber at the end i j of the chambe opposite said feed rolls and having a tower channel extending therethrough aligned with said chamber channel, said tower channel defining a cooling zone, whereby the crimped yarn core is fed into said cooling zone after passage through said setting zone and the yarn is cooled therein. 19. A stuffer crimper as recited in claim 18, further characterized by winder means for withdrawing yarn from said tower channel. 20. A stuffer crimper as recited in claim 19, further characterized by means for Controlling the relative rotational velocity of said feed rolls and the withdrawal rate of said winder means. 21. A stuffer crimper as recited in claim 20, further characterized in that said controlling means comprises a plurality of magnetically sensitive switches spaced apart along said tower and operably connected to said feed roll driving means and said withdrawing means, and magnet means movable with an end Of the crimped yarn core in the tower channel for selectively closing and opening said switches. 22. A stuffer crimper as recited in claim 20; further characterized in that said controlling means comprises at least two magnetically sensitive ■ switches spaced apart along said tower, said two switches being operably connected to ?;aid withdrawing means, and magnet means movable with an , end of the crimped yarn core in the tower channel for selectively closing ! : and opening said switches, whereby when one of said switches is closed and the other of said switches is open said withdrawal rate is a first ! ·' predetermined magnitude and when said other switch is closed and said jj one switch is open said withdrawal rate is a second predetermined jl magnitude. \ ■ 23. A stuffer crimper as recited in claim 22, further characterized in that said controlling means comprises at least two additional magnetically- sensitive switches, one of said additional switches being spaced apart ' along said tower above said two switches and the other of said additional switches being spaced apart along said tower below said two switches, said one additional switch being operably connected to said feed roll driving means and said other, additional switch being operably connected to said feed roll driving means and said withdrawal means, whereby when said one additional switch is closed said feed roll driving means is turned off and when said other additional switch is closed said feed roll driving means, and said withdrawing means are turned off. 24. A stuffer crimper as recited in claim 19, further characterized by a slug positioned freely in the end of said tower channel opposite the end of said tower affixed to said chamber and having a slug channel therethrough, I said slug being adapted to ride on an end of the crimped yarn core in the tower channel, whereby the yarn is withdrawn through said slug channel in continuous filament form. 25. A stuffer crimper as recited in claim 24, further characterised in that said slug comprises an upper generally parallelepiped shaped portion and a lower generally pyramidal shaped portion, said lower portion includin ■r' ■ t i a o ir of leg-like members extending 'downwardly at I respective opposite sides ther eof .gaid members being the ' only portions of the slug adapted to contact said yarn core end. ! . 26. A stuffer crimper as r.e_cited in claim. 25, further characterized in that said tower channel' has a substantially rectangular transverse cross^section, and wherein 'said leglike members are 'positioned adjacent the' walls of :said tove'r channel having the shortest transverse dimension.. ; 27. A stuffer crimper as rec ited in claim 24, further characterized in that said slug channel 'has a generall elliptica transverse cross-section, \ . ] 28. ,A method of -texturing- continuous filament yarn ■ ■ " i: j I characterized by :the steps of: feeding said yarn into a confined, crimping zone against a mass of crimped yarn therein causing the yarn to ; . - ■ ■ ■ ί collapse longitudinally and fold over forming crimps ,'which become part of s&id mass; ■ ' . j | ■ applying heat and pressure to said crimped yarn mass in said crimping zone to plastically deform the yarn and partially set said crimps; j " ; ; : ■ ■ ■ ' · ; ' . , I feeding said crimped yarn mass from sa d crimping zone to a setting zone at a controlled rate; ; " j ' ' applying heat and pressure to said crimped yarn ' · ■ j mass in said setting zone to fully set ;said crimps, the pressure / applied to said, mass in said setting zone being substantially ·. · · i only sufficient ;to keep said crimp closed; ! ■ ' . ' · ■ i ■' . ' ' - ■' ;' ' ■· ' . i feeding said crimped ,yarn mass from sa'id setting- of said mass .in said setting and cooling zones. ¾ ' '; 36. A method as recited in claim 28, further ! characterized in that said yarn ,is a continuous filament polyester yarn. 37.' A crimped yarn product produced by the method recited in claim 28. ■ ',' . . .. · ' 1 FOR AND ON BEEALP OP. APPLICANT v /