US3611694A - Method of and apparatus for threading in threads on drawtwisting or drawwinding machines,and improved knot used in the performance of said method - Google Patents

Method of and apparatus for threading in threads on drawtwisting or drawwinding machines,and improved knot used in the performance of said method Download PDF

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Publication number
US3611694A
US3611694A US846727A US3611694DA US3611694A US 3611694 A US3611694 A US 3611694A US 846727 A US846727 A US 846727A US 3611694D A US3611694D A US 3611694DA US 3611694 A US3611694 A US 3611694A
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Prior art keywords
thread
feed mechanism
threads
zone
drawtwisting
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Expired - Lifetime
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US846727A
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English (en)
Inventor
Rudolf Jaeggli
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Maschinenfabrik Rieter AG
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Maschinenfabrik Rieter AG
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    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
    • D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
    • D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch
    • D02J1/225—Mechanical characteristics of stretching apparatus

Definitions

  • the present invention relates to a new and improved method of threading in threads on drawtwisting or drawwinding or similar machines, further concerns an apparatus for implementing the inventive method.
  • creeled bobbins hold a quantity of thread sufiicient for filling a plurality of drawtwisting or drawwinding bobbins. It is a known procedure to stop the drawtwisting or draw-winding machine for dofiing the full packages and donning empty tubes and to restart the machine without the need of re-threading all the threads. This procedure, however, is applicable only, as long as the creel packages do not need to be changed. If a creeled package is emptied so far that the rest of the undrawn thread left on it will not yield another full drawtwisting or draw-winding bobbin, then the thread is severed and a new package is creeled in.
  • the apparatus for implementing the method according to the invention is generally manifested by means for temporarily reducing the drawing ratio.
  • FIG. 1 is a schematic view of the thread path on a drawtwisting machine
  • FIG. 2 is a perspective view showing details of a thread cutting and holding device
  • FIG. 3 is a schematic side view of a drive cabinet of a drawtwisting machine
  • FIG. 4 is a perspective view of a lifting device for the pressure roll of a thread feed or delivery mechanism
  • FIG. 5 is a perspective view of a drawing zone
  • FIG. 6 illustrates details of a preferred form of knot connecting two thread ends
  • FIG. 7 is a side view of an alternative design of the drive cabinet shown in FIG. 3;
  • FIG. 8 is a side view of another embodiment of the drive cabinet shown in FIG. 3;
  • FIG. 9 depicts an alternative design of drawing zone according to FIG. 5.
  • FIG. 1 an undrawn thread 2 pulled off a creeled package 1, composed of one or a plurality of endless filaments, passes a stationary thread guide 3, a cutting and holding device 4, a thread brake 5. Then thread 2 passes onto a thread feed or delivery mechanism consisting of a single pressure roll 6 and a delivery roll 7 extending along the length of the machine. Pressure roll 6 is equipped with detachable loading means, here shown designed as a pivotable loading arm 8.
  • the thread 2 passes through the nip formed by these two rolls 6 and 7 at a low feed velocity or speed V and by means of drawing roll 9 and separator or deflector roll 10 this thread 2 is taken oif at a speed V which is three to four times higher than V drawing of the thread thus being effected. In many cases, this process is carried out while using an intermediately disposed drawing pin 11.
  • the thread 2 passes through a traveller 12 slidably arranged upon a ring 13 traversing up and down and is transferred onto a tube or sleeve 14 where it is wound into a thread package 15.
  • a waste cone 17 is arranged on spindle 16 down to which section of the spindle 16 the traveller ring 13 is temporarily lowered for the formation of a waste bunch 18.
  • the twist imparting winding mechanism consisting of spindle 16, ring 13 and traveller 12, described here with reference to the example of a drawtwisting machine, of course, can be replaced by a winding mechanism not imparting twist, such as conventionally used on draw-winding machines. I As best seen by referring to FIG.
  • the thread cutting and holding device 4 consists of a stationary rail 19 extending along, and fixed to, the machine frame, and a rail or rod 20 arranged slidably along rail 19.
  • Each rail 19 and 20 is provided with a blade 21 and 22, respectively, the latter further being equipped with a thread clamping device 23, as shown, which contacts the edge 24 of the other blade 21 and clamps the thread end extending or running towards the thread brake 5.
  • the respective thread ends of the new creel packages 1 are threaded through the thread guide 3 arranged in front of the cutting point and are connected to the thread end held ready by the cutting and holding device 4 by means of, for instance, a knot, a welding or an adhesive bond.
  • the drawing ratio is reduced by suitable means, described in greater detail later on, at least while the connection or attachment location of the two thread ends passes through the drawing zone, so that no thread break occurs.
  • This connection location or point subsequently is wound onto waste cone 17 into waste bunch 18, rather than onto the thread package 15. Additionally, the entire passage of the thread connection point may take place while the machine is running slowly at crawl speed.
  • FIG. 3 a drive cabinet of a drawtwisting machine with the feed mechanism drive and with the draw roll drive is illustrated.
  • the main drive motor 25 drives the spindle drive shaft 26 and, via two gears 27 and 28, the drive shaft 29 of the draw rolls 30.
  • On shaft 29 there are also arranged two more gears 31 and 32 which mesh with gears 34 and 35, respectively, arranged to be freely rotatable upon feed roll shaft 33.
  • a disc 36 is fixed on shaft 33.
  • a selectively operable reduction gear box 40 can be inserted into the drive train, if needed, permitting a slow or crawl motion of the machine.
  • This design proposal also may be selected for draw-windingmachines as the winding speed is not affected by reduction of the drawing ratio.
  • FIG. 4 Another embodiment of the invention, as shown in FIG. 4, permits the change in drawing ratio by means of lifting the pressure roll of the feed mechanism.
  • Pressure rolls 41 which in the arrangement of FIG. 4 rest upon feed roll 42 under their own weight, are arranged to be freely pivotable on shaft 44.
  • a carrier lever 45 fixed on this shaft 44 reaches under the associated support arm 43, and by turning shafts 44 by means of a crank 48 via tWO mutually meshing gears 46 and 47 these pressure rolls 41 are thus lifted off the associated feed or delivery roll 42.
  • a ratchet 49, or equivalent structure secures arms 43 in the lifted position.
  • FIG. 5 Still a further embodiment suitable for drawtwisting machines is shown in FIG. 5.
  • a zone of low friction 53 for instance a sand blasted zone. If the thread 54 is placed there (yarn path indicated in dashed lines) the circumferential speed of the draw rolls 52 is not transferred to the thread 54 owing to slippage at zone 53, that is, the' thread moves at the feed speed V towards the winding position (not shown). No drawing action thus takes p ace. Shifting of the thread 54 along the associated'draw roll 52 is effected quite simply by moving a rail 55 or equivalent structure, on which a plurality of thread guide elements, e.g.
  • drawing pins 56 are mounted, so far to the outside that thread 54 is guided onto zone 53.
  • This movement is effected by a suitable motor 57 provided with a reduction gear arrangement 58 and driving a shaft 59 on which there are provided control cam disc 60 and suitably shaped control cams 61.
  • Cam disc 60 activates a switch 62 controlling drive motor 57 which after the connection of the thread ends is established is started by hand, and after half a revolution of shaft 59 is stopped again by the next cam passing and activating the switch button 63.
  • Rods 66 rigidly connected to rail 55 are arranged horizontally slidable in a housing 65 of the frame and are pressed against cam disc 61 by springs 64.
  • Motor 57 turns shaft 59 half a revolution or turn so that rail 55 moves outwardly into the position indicated by dash-dotted lines and remains there until the thread connection point has left the drawing zone.
  • the original condition is again established, that is to say, the thread is again guided onto the zone of high friction of the associated draw roll 52 (thread path indicated with solid lines) from the feed roll.
  • the drawing ratio thus again corresponds to the original value.
  • This design would not be feasible for drawwinding machines as the winding speed cannot be reduced to the feed speed V without difficulties.
  • Another example of the invention provides reduction of the drawing action without mechanical means, but provides a thread connection of such extensibility that a normal drawing action can not take place. This is achieved, for example, by incorporating a thread reserve into the thread connection, as best seen by referring to FIG. 6.
  • the thread end 67 running out is knotted in such manner that the end 68 of the new thread can slide in it, but catching on of the connection or attachment location at the thread guide elements, however, is not possible.
  • the end 68 of the new thread forms a loop 69 as a thread reserve through knot 70 in the thread end 67 running out and is tied on itself in a slidable knot 71, a thread length L being provided which can be used up while knot 71 moves toward knot 70 during the passing of the thread connection location through the drawing zone.
  • Friction conditions in knots 70 and 71 are chosen such that loop 69 is not pulled out while it passes through the thread guide elements in front of the feed mechanism, but that after passing the feed mechanism, however, and before reaching the drawing pin, sliding occurs already such that the knot moves around the drawing pin without being tensioned by the full drawing tension.
  • the same procedure also is applicable in a drawing zone without a drawing in.
  • gear 72 can be coupled to shaft 73 by means of a clutch 79 which is activated and released by switch 74. If the feed mechanism is uncoupled by switch 74 and pressure rolls 75 remain weighted, the threads 76 drag the feed mechanism, the threads being subject to an elastic deformation only as e.g. in processing of heavy denier threads, or the braking momentum acting on the feed mechanism due to friction in the bearings generates tensions in the thread sufficient for partial drawing. This might be the case if finer denier threads are processed. Somewhat higher thread tensions are generated if the inertia of the feed rolls is an influencing factor. This is the case if the machine is speeded up to normal operating speed while the thread connection passes through the drawing zone, in which case the feed mechanism must be accelerated by the tension on the threads exclusively.
  • FIG. 8 A further embodiment is shown in FIG. 8.
  • a first drawing phase e.g. with a thread drawing ratio ranging from 1.004 to 1.5 is effected in a drawing zone I between feed mechanism 172 and a first draw roll 173 rotating at high speed, whereupon a second, major drawing phase follows, for instance, with a thread drawing ratio ranging from 4 to 2.8, in a drawing zone II ending at draw roll 174.
  • an analogous arrangement comprising a clutch 177 coupling alternatively gears 175 or 176 here is used to reduce the drawing ratio in the drawing zone II to e.g: a ratio of 2, if gear 175 is coupled to disc 178 which is fixed on shaft 179.
  • the drawing ratio in the zone I being smaller anyhow, can remain unchanged as the danger of thread breakage due to excessive tension in the knot passing through the drawing zone is relatively small at low drawing ratios.
  • This design also is suitable for draw-winding machines, as the speed of the thread leaving draw roll 174 is not influenced.
  • a further advantageous application of the principle shown in FIG. 5 can be used on a draw twisting machine equipped with a drawing and a relaxing zone, as schematically shown in FIG. 9.
  • the thread is drawn in drawing zone I and subsequently is relaxed by roll 82 rotating at lower speed in relaxing zone II. If the thread is guided onto the region or zone 83 of lower friction of roll 81 (thread path indicated by dash-dotted lines) slippage of the thread on this roll occurs and drawing no longer takes place. In zone II also no more relaxation can thus take place since an undrawn thread can not relax.
  • the thread on roll 82 also moves onto the zone 84 of the lower friction provided here also, so that the thread also leaves this roll 82 at the feed speed and thread accumulations in the relaxing zone are avoided.
  • a method of threading in threads on drawtwisting, draw-winding or similar machines comprising the steps of:
  • step of reducing the drawing ratio imparted to the thread is effected by increasing the speed of the feed mechanism by means of the tension in the thread.
  • step of reducing the drawing ratio imparted to the thread incorporates the step of tying a thread reserve into the connection of the thread ends.
  • the method of claim 1 including the step of subjecting the thread to a drawing a-ction imparted to such thread in two phases, wherein during the first phase a smaller part and in the second phase a large part of the drawing ratio is applied, and reducing the drawing ratio during the second phase while the thread connection passes through the drawing zone.
  • An apparatus for threading in threads on drawtwisting, draw-winding and similar machines comprising a driven feed mechanism and a draw mechanism defining at least one drawing zone, and means for reducing the drawing ratio imparted to a thread during such time as a thread connection location thereof passes through said drawing zone.
  • said means includes a gear drive which alternatively can be coupled for driving said feed mechanism at increased s eed.
  • feed mechanism includes feed roll means, said reducing means incorporating pressure roll liftably arranged on said feed roll means of said feed mechanism.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
US846727A 1968-08-08 1969-08-01 Method of and apparatus for threading in threads on drawtwisting or drawwinding machines,and improved knot used in the performance of said method Expired - Lifetime US3611694A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1211868A CH477572A (de) 1968-08-08 1968-08-08 Verfahren und Vorrichtung zum Einziehen von Fäden bei Streckzwirn- oder Streckspulmaschinen und dergleichen Maschinen mit Fadenstreckwerk

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US3611694A true US3611694A (en) 1971-10-12

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US846727A Expired - Lifetime US3611694A (en) 1968-08-08 1969-08-01 Method of and apparatus for threading in threads on drawtwisting or drawwinding machines,and improved knot used in the performance of said method

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US (1) US3611694A (en, 2012)
CH (1) CH477572A (en, 2012)
DE (1) DE1940525A1 (en, 2012)
FR (1) FR2015257A1 (en, 2012)
GB (1) GB1274458A (en, 2012)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3811264A (en) * 1972-04-10 1974-05-21 Fiber Industries Inc Yarn creeling and transferring process
US3857231A (en) * 1972-08-29 1974-12-31 Phillips Petroleum Co Method for double creeling feed yarn
CN107326485A (zh) * 2017-07-24 2017-11-07 重庆天泽新材料有限公司 一种初捻机生产并捻纱用分纱器及其使用方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1101178A (en) * 1978-03-13 1981-05-19 Takao Negishi Bundle of fibrous elements, method and apparatus for producing thereof
GB8714945D0 (en) * 1987-06-25 1987-07-29 Davison D G Scaffolding systems

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3811264A (en) * 1972-04-10 1974-05-21 Fiber Industries Inc Yarn creeling and transferring process
US3857231A (en) * 1972-08-29 1974-12-31 Phillips Petroleum Co Method for double creeling feed yarn
CN107326485A (zh) * 2017-07-24 2017-11-07 重庆天泽新材料有限公司 一种初捻机生产并捻纱用分纱器及其使用方法

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Publication number Publication date
FR2015257A1 (en, 2012) 1970-04-24
CH477572A (de) 1969-08-31
GB1274458A (en) 1972-05-17
DE1940525A1 (de) 1970-02-12

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