US3835636A - Process for winding synthetic yarn - Google Patents

Process for winding synthetic yarn Download PDF

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Publication number
US3835636A
US3835636A US00303871A US30387172A US3835636A US 3835636 A US3835636 A US 3835636A US 00303871 A US00303871 A US 00303871A US 30387172 A US30387172 A US 30387172A US 3835636 A US3835636 A US 3835636A
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United States
Prior art keywords
yarn
ring
bobbin
drawtwister
irregular
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Expired - Lifetime
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US00303871A
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English (en)
Inventor
H Nakanishi
K Kawashima
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Teijin Ltd
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Teijin Ltd
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Priority to US00303871A priority Critical patent/US3835636A/en
Priority to CH1722972A priority patent/CH549658A/de
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
    • D01H1/14—Details
    • D01H1/38—Arrangements for winding reserve lengths of yarn on take-up packages or spindles, e.g. transfer tails

Definitions

  • the present invention relates to improvements in a winding process in which yarn is wound with a drawtwister, and particularly to improvements in a winding process when the drawtwister is being stopped.
  • the undrawn yarn unwound from an undrawn yarn package is drawn, twisted and wound in a package on a bobbin inserted into a wind-up spindle in a drawtwister.
  • This drawing and packaging operation is simultaneously carried out on all the spindles of the drawtwister and when desired packages on each bobbin are completed, the machine is stopped to remove all the full packages from the machine and insert new empty bobbins for a second drawing and packaging operation.
  • drawing and packaging operations are continuously carried out with four to five consecutive operations if one undrawn yarn package is threaded on the drawtwister, and consequently, the drawtwister is started up and stopped four to five times.
  • An undrawn yarn on an old package and an undrawn yarn on a new package are tied with each other before the undrawn yarn on the old package becomes empty, and the undrawn yarn is provided to enable continuous drawn yam packaging.
  • the synthetic yarn drawn at the start-up of the drawtwister before the machine reaches normal speed is different from the yarn drawn at normal speed in yarn qualities and should be prevented from being included in the regular yarn package. For this reason, a traverse ring is maintained in the position of a waste spool secured at the base of the spindle at the start-up of the machine to wind up initial irregular yarn thereon. After the machine has reached normal speed, the ring is traversed along a bobbin situated above the waste spool to form a regular yarn package on the bobbin.
  • the machine runs by inertia for some time after the turning off of its drive motor to stop, during which the machine runs at speed lower than normal speed and the resulting drawn yarn should be prevented from being included in a regular yarn package at the start-up of the machine.
  • the ring is lowered in a waste spool position, and irregular yam during the rotation by momentum .is wound on the waste spool aftermotors for driving the machine are switched off.
  • a wound-up package is unwound and undergoes various treatments in subsequent treatment processes.
  • yarn is drawn off over the end of the package.
  • a terminal winding of the wound yarn that is, a leading thread end of yarn is preferably located at the top of the package.
  • the ring is lifted to the upper end of a bobbin where the bulk of a package is not held at the mechanical stoppage of the drawtwister to lead and wind an initial thread end of the package there and spin the most part of irregular yarn caused during the inertial rotation of the machine on the uppermost end of the bobbin, and then the ring is lowered to a waste spool position below the bobbin.
  • a transfer tail is, in general, formed at the base of a bobbin.
  • the transfer tail is formed on the lower end of the bobbin where package of yarn is not formed by the yarn layer initially wound on the innermost layer of package, that is, on the surface of the bobbin.
  • the ring descends to the waste spool position and irregular yarn is laid on the transfer tail at the base of the bobbin.
  • This transfer tail becomes frayed or sloughed off when the irregular yarn thereon is stripped off from the bobbin, and becomes impossible to use as a transfer tail.
  • a modern drawtwister is provided with individual motors for use in driving the drawing section, and the twisting and packaging section or the spindle section independently of each other.
  • the present invention provides an improved yarn winding process in such a drawtwister having individual drive means.
  • the drawing section is rerun, with an auxiliary, low speed drive source instead of the normal drive source for the drawing section and the timing of ring descending speed in reference to a drawing speed is easily adjusted to prevent yarn breakage.
  • FIG. 1 is a perspective view of outlined mechanism of one embodiment of a drawtwister of the present invention.
  • FIG. 2 is a fragmental side elevation of traversing mechanism of a ring rail of the drawtwister in FIG. 1.
  • FIG. 3 is a detail side elevation of a twisting and packaging section of the drawtwister.
  • FIG. 4 is a detail view of the waste spool of FIG. 3.
  • FIG. 5 is speed diagrams of each section of the drawtwister at the stoppage thereof for describing the process of the present invention in the drawtwister of FIG. 1.
  • FIGS. 6, 7 and 8 are graphs showing the relation of lowering of treatment speed with qualities of treated yarn: Tensile strength of yarn in FIG. 6, shrinkage of yarn in boiling water in FIG. 7, and dyeability of yarn in FIG. 8.
  • FIG. 9 is speed diagrams of each section of a drawtwister when the machine is set in stoppage for explaining another embodiment of the present invention.
  • FIG. 10 like FIG. 9 is a speed diagram in stili another embodiment of the present invention.
  • FIG. 1 I is a sectional view of a package wound by the process as shown in FIG. 10.
  • drawing and packaging sections only one drawing and packaging unit is shown for simplicity in a driving system.
  • one drawtwister is provided with about to drawing and twisting units and these are simultaneously driven by driving source.
  • FIG. 1 undrawn yarn unwound from an undrawn yarn package 1 is received with a feed roller 3 bearing on a nip roller 2 and drawn to several times the original length between the feed roller 3 and a draw roller 4 having a peripheral speed higher than that of the feed roller 3.
  • heat treatment may be carried out whenever necessary with appropriate heating means
  • FIG. 1 multi-step drawing is carried out with a plurality of draw rollers in some cases.
  • the yarn thus drawn passes through a lappet guide 5 and a traveler 7 mounted on a ring 6 and sliding thereon. Then the yarn is wound on a bobbin 9 mounted on a revolving spindle 8 to form package 10.
  • the feed roller 3 is directly arranged on a rotary shaft 11 longitudinally extending along a drawtwister and at one end of the rotary shaft 11 is provided a gear 12.
  • a gear 12 On the otherhand, to the rotary shaft 13 of the draw roller 4 is attached a helical gear 14, which meshes with a he lical gear 15 intersecting it at right angles.
  • the helical gear 15 is secured to a driving shaft 16 longitudinally extending along the drawtwister.
  • a gear 17 is connected to one end of the driving shaft 16 and to the gear 17 is connected to one end of the driving shaft 16 and to the gear 17 is connected a gear 12 through a gear train 18.
  • the feed roller 3 and the draw roller 4 rotate in interlocking arrangement and the speed ratio, that is draw ratio, is determined by the size of each gear and the diameter of each roller.
  • a pulley 20 is mounted on a shaft 19 of the gear 17 and is connected to a pulley 23 secured to an output shaft 22 of a motor 21 through a belt 24.
  • the rotation of the driving motor 21 for driving the drawing section is transmitted by the aid of such transmission gears to the feed and draw rullers constituting the drawing section.
  • a tin pulley 29 is mounted on a tin pulley shaft 28 longitudinally arranged along the drawtwister.
  • a spindle belt is extended between the pulley 8a of the spindle 8 and the tin pulley 29 through idle pulleys 31, 32, and the spindle 8 is driven by friction in contact with the spindle belt 30 through the pulley 8a.
  • a motor 26 for driving the spindle is direct-coupled with an end of the tinpulley shaft 28 through a coupling 27, and is generally variable in speed.
  • a ring holder 33 holding in place the ring 6 is secured to a ring rail 34 extending along the length of the draw twister and makes up-and-down motions with those of the ring rail 34.
  • One end of a suspension belt 35 is attached to the ring rail 34 and the other end thereof to a pulley 36.
  • Another pulley 38 is secured to a rotary shaft 37 of the pulley 36 and to the pulley 38 is attached one end of a belt 39.
  • the other end of the belt 39 is attached to a traverse bar 40 reciprocating left and right (see FIG. 2).
  • the end of the traverse bar 40 is connected to a piston rod 43 of a cylinder 42 through a coupling 41.
  • Pressure oil is alternately fed to both sides of the piston rod 43 of the cylinder 42 to permit the piston rod 43 to make a reciprocating motion and the pulley 38 to make a reciprocal turn by the aid of the traverse bar 40.
  • the pulley 36 arranged coaxially with the pulley 38 is also causedto make a reciprocal turn to reciprocate ring rail 34 through the suspension belt 35.
  • the stroke of the piston rod 43 is amplified according to the ratio of diameter of the pulley 38 to that of the pulley 36 and transmitted to the ring rail 34.
  • ring traversing mechanism is driven and controlled independently of the drawing section and the spindle.
  • a lower-speed auxiliary driving source at the drawing section will be described below.
  • a lower-speed auxiliary drive motor 45 is connected to the end of an output shaft 22 of a motor 21 by the aid of an electromagnetic clutch 44.
  • the motor 45 is variable in speed, for instance, with the use of a pole change type.
  • the electromagnetic clutch 44 is off and the drawing section is driven with the motor 21.
  • the electromagnetic clutch 44 is actuated during the ring lowering movement to connect the output shaft 22 with the motor 45 such, that the motor 45 restarts the drawing section at lower speed.
  • the ring rail 34 is positioned in the lowest position to hold the ring 6 to the position of a waste spool 46 mounted on the spindle 8 at the base of the bobbin 9.
  • the state of the packaging section is shown in FIG. 3.
  • one drawtwisting operation has already been carried out and yarn Y is threaded on the drawing section and kept wound on a waste spool 25 via a traveler 7 (At the initial start of drawtwisting, a threading-up operation is required, but in this instance the threading-up operation can be omitted because of the continuous simultaneous doffing operation described before).
  • the motors 21 and 26 are turned on at this state to start the drawtwister and the ring 6 is held in the position of the waste spool 25 until the feed roller, the draw roller and the spindle resume normal speed. Afterwards the ring 6 is traversed along the bobbin 9 to form a package 10.
  • a transfer tail d is formed at the base of the bobbin as shown in FIG. 4.
  • the traversing motions form package of yarn by what is called a parallel winding process in which traverse length gradually lessens.
  • the stroke of the hydraulic cylinder 42 reciprocating up and down the ring rail 34 is shortened by controlling the change-over timing of pressure oil fed to the hydraulic cylinder.
  • the desired package 10 is completed on the bobbin 9, and thereafter the ring 6 is lifted to the upper end of the bobbin 9 immediately before or simultaneously with the turning-off of the motors 21 and 26 of the drawtwister.
  • This state is shown by the two-dot chain line in FIG. 3.
  • the drawtwister is temporarily stopped in that state and irregular yarn generated during the inertial rotation of the machine is wound on the uppermost end of the bobbin as a bunch of yarn a.
  • the irregular yarn produced after the mechanical stop of the machine has been reached and before the spindle is brought to a complete standstill is all wound on the uppermost end of the bobbin.
  • the ring 6 is low ered to the waste spool position for the start of a subsequent winding operation.
  • the electromagnetic clutch 44 is actuated to start only the drawing section (feed and draw rollers) and drive it at an exceedingly low speed with the lower speed auxiliary drive motor 45 while the primary motor 21 is kept suspended and the ring 6 is lowered to the position of the waste spool 25 with preventing yarn b from wrapping itself around the package. In order that the ring 6 may be lowered, the drawing section (feed and draw rollers) and drive it at an exceedingly low speed with the lower speed auxiliary drive motor 45 while the primary motor 21 is kept suspended and the ring 6 is lowered to the position of the waste spool 25 with preventing yarn b from wrapping itself around the package. In order that the ring 6 may be lowered, the
  • FIG. 5 shows speed diagrams at the stoppage of members of a draw twister in conducting such a winding process.
  • drawing section speed draw roller speed
  • rpm of the spindle and ring traverse ring position
  • abscissa periods of time
  • the winding process as embodied will be described.
  • the ring 6 is lifted to the upper end of the bobbin (point H) and the motors 21 and 26 are turned off.
  • the drawing section and the spindle are separately driven with individual motors, it'is difficult to synchronize the stoppage of the spindle and that of the drawing section.
  • the drawing section and the spindle rotate by inertia, gradually decelerate and come to a complete standstill (from the time A to a time B0 or a time B).
  • the drawing section is widely distinguished from the spindle in inertia. Ordinarily, the inertia of the spindle holding a considerably heavier package becomes greater.
  • both motors 21 and 26 are simultaneously turned off, the spindle continues to rotate for a long period of time after the stoppage of the drawing section.
  • the stoppage of both motors is preferably simultaneous. If the spindle continues to rotate for a long period of time after the stoppage of the drawing section yarn is twisted off. For this reason, a brake is actuated on the spindle motor to stop the spindle in as short a time as possible.
  • the motors 21 and 26 are supposed to be turned off simultaneously at the time A for convenience sake, but the motor 26 is turned off a little earlier than the motor 21 to have their time of stoppage agree with each other.
  • the drawing section is stopped at the time B0 and the spindle a little later at the time B by applying a brake or staggering a time for turning off each motor to adjust their stoppage timing and prevent yarn from being twisted off.
  • the ring is held in a position H until the spindle is brought into a complete stoppage at the time B to wind the irregular yarn at the uppermost end of the bobbin.
  • the spindle motor 26 which is variable in speed, is capable of being started at low speed and there is no need to use an auxiliary motor for low-speed driving. Even if the rpm of the spindle at the time of restart at a lower speed is somewhat greater, it does not interfere with packaging through the rpm of a traveler becomes greater.
  • the drawing section stops when a time D comes and the spindle stops a little later at a time Do to stop the drawtwister completely. Since it is still difficult to stop the drawing section and the spindle at the same time, the driving periods of time and speed of the motors 45 and 26 are controlled such that the spindle stops :1 little later than the drawing section.
  • the irregular yarn produced during the internal rotation of the machine from A to the time B0 is wound on the uppermost end of the bobbin as the bunch of yarn a in FIG. 4, but since as described above during the ring lowering movement (from B to the time C), the spindle is not in rotation, the irregular yarn will not wrap itself around the package. In the prior art, the spindle has so far been rotated during the ring lowering movement and the irregular yarn has been allowed to wrap itself on the surface of a package as shown by the one-dot chain line e in FIG. 3.
  • the spindle After the time C when the descent of the ring to the position of the waste spool is completed, the spindle is driven at low speed, and consequently the desired amount of yarn (5 to 20 windings of yarn) is wound on the waste spool so as to give a satisfactory start-up for a subsequent winding operation without any yarn breakage.
  • doffing and donning are carried out by severing the portion of yarn c extending from the waste spool 25 to the transfer tail section (FIG. 4), removing the package 10, and mounting an empty bobbin on the spindle 8 to complete one winding operation.
  • the leading thread end of a package is led to the upper end of the bobbin after the completion of the package by the shifting of a ring to the upper end of a bobbin, and thereby the handling of the package in a subsequent process becomes convenient.
  • the drawing section is driven at a lower speed and yarn is fed with ring lowering speed, resulting in no yarn breakage at the time. Further, at the beginning of a subsequent drawtwisting, yarn wound accurately on a waste spool will not cause yarn breakage at the start of the machine.
  • the amount of irregular yarn to be wound on the upper-most end of a bobbin depends on the length of time from A to the time B; that is, the longer the time of inertial rotation at the drawing section, the more is the amount of irregular yarn (waste yarn). It is preferable that the time is as short as possible. After turning off the motor 21, it is desirable to apply the brake to the motor 21 or the driving system of the drawing section and minimize the period of time of the inertial rotation.
  • the time as abscissa in FIG. does not denote an actual time.
  • the actual time at the stoppage of the drawing section and the spindle in the process of FIG. 5 will be described below.
  • drawing is conducted at a speed of 1,000 to 1,300 m/min and a package weighing 2.5 to 3.0 kg is completed by a spindle varying from 15,000 to 7,000 rpm.
  • the drawing section stops in 15 to 25 sec (A to the time B) and the spindle stops to sec behind the stoppage of the drawing section.
  • inertia is great and the brake is usually applied to the motor to adjust the time required for complete stoppage. Accordingly, between A and the time B is 25 to 40 sec in FIG. 5.
  • the time required for the ring lowering movement between B and the time C is 3 to 5 sec, during which time the drawing section is driven at low speed at a peripheral speed of the draw roller of about 2 to about 7.5 m/min.
  • the peripheral speed of the draw roller is raised to 8 to 24 m/min, preferably about 15 m/min as shown in FIG. 5 C D in winding yarn on the waste spool.
  • a time C D requires about see. In this way, low driving speed is changed over in two steps to eliminate yarn breakage during the ring lowering movement and wind yarn accurately on the waste spool after the completion of ring descent.
  • a time B D for low speed driving in the drawing section is about sec. Five to 10 seconds after the stoppage of the drawing section,
  • Dyeability here means a grade of a disperse dye affinity for yarn. Assuming that the dyeability of yarn drawn at a drawing speed of 1,000 m/min is zero whether the yarn dyes heavier or lighter is measured by a sensory test stands for heavier dyeing and stands for lighter dyeing).
  • Shrinkage in boiling water is a percentage of the contracted length of a yarn specimen having a given length to the original length after the yarn specimen has been dipped in boiling water a few minutes.
  • FIG. 6 shows that the yarn has little or no different properties from regular yarn until the drawing speed declines to 500 m/min.
  • the ring is lifted to the upper end of the bobbin until drawing speed has reached the limit speed V0 after the turning off of the machine to make easy stripping operation of the irregular yarn and to save the amount of yarn to be discarded as waste which is economical.
  • FIG. 1 l is a cross sectional view of a package wound by the process of FIG. 10.
  • the periods of time during which ring traversing is temporarily stopped in the position Ho are sufficient enough to obtain the number of windings required for securing the end of yarn to the bobbin and ordinarily about 0.2 to 3 sec will be enough.
  • the bunch of yarn a should be formed outside the bulk of the package, that is, the upper end of .the bobbin.
  • the bunch can be formed on the belly of the package, but induces disad vantageously stains, fuzzing and sloughing off of the package.
  • the bunch a for securing a leading end of bin mounted on the twist spindle, and irregular yarn occurring at the starting and stopping of the drawtwister is wound on the irregular yarn winding section, which comprises switching off each of said motors when winding of the yarn on the bobbin is completed, then moving the ring to the uppermost end of the bobbin to wind the bunch of irregular yarn, formed during the inertial rotation before the drawtwister is brought to a complete standstill, restarting only the drawing section at low speed after the completion of the standstill of the drawtwister, lowering the ring to the irregular yarn winding section, then restarting the spindle at low speed to wind the irregular yarn on the irregular yarn winding section, and thereafter stopping the drawing section and the spindle.
  • a process for winding synthetic yarn as set forth in claim 1 wherein after the ring has been lowered to the irregular winding section position, speed in the drawing section is rendered higher than that at the time of the lowering movement of the ring and the spindle is restarted at low speed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
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US00303871A 1972-11-06 1972-11-06 Process for winding synthetic yarn Expired - Lifetime US3835636A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US00303871A US3835636A (en) 1972-11-06 1972-11-06 Process for winding synthetic yarn
CH1722972A CH549658A (de) 1972-11-06 1972-11-27 Verfahren zum aufspulen von synthetischem endlosgarn.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US00303871A US3835636A (en) 1972-11-06 1972-11-06 Process for winding synthetic yarn
CH1722972A CH549658A (de) 1972-11-06 1972-11-27 Verfahren zum aufspulen von synthetischem endlosgarn.

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5924644A (en) * 1997-04-04 1999-07-20 Zinser Textilmaschinen Gmbh Method of producing different types of spool windings, especially flyer or composite spools

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1614879A (en) * 1920-07-14 1927-01-18 Barber Colman Co Method of spinning
US3075342A (en) * 1960-08-01 1963-01-29 Barmag Barmer Maschf Shifting and switching mechanism for a ring rail
US3356313A (en) * 1965-10-15 1967-12-05 Ici Ltd Yarn package

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1614879A (en) * 1920-07-14 1927-01-18 Barber Colman Co Method of spinning
US3075342A (en) * 1960-08-01 1963-01-29 Barmag Barmer Maschf Shifting and switching mechanism for a ring rail
US3356313A (en) * 1965-10-15 1967-12-05 Ici Ltd Yarn package

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5924644A (en) * 1997-04-04 1999-07-20 Zinser Textilmaschinen Gmbh Method of producing different types of spool windings, especially flyer or composite spools

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Publication number Publication date
CH549658A (de) 1974-05-31

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