US3333407A

US3333407A - Method and apparatus for the doffing of yarn packages

Info

Publication number: US3333407A
Application number: US450723A
Authority: US
Inventors: Bruin Hendrik De; Lommers Willem
Original assignee: ALGEMENE KUNSLZIJDE UNIE
Current assignee: ALGEMENE KUNSLZIJDE UNIE
Priority date: 1964-04-30
Filing date: 1965-04-26
Publication date: 1967-08-01
Anticipated expiration: 1984-08-01
Also published as: ES312103A1; NL6404821A; BE662008A

Description

Aug. 1, 1967 H. DE BRUIN ETAL METHOD AND APPARATUS FOR THE DOFFING OF YARN PACKAGES Filed April 26, 1965 INVENTORS 6 Z km fw km 16 2 Z m my United States Patent 3,333,407 METHOD AND APPARATUS FOR THE DOFFIN 0F YARN PACKAGES Hendrik de Bruin, Arnhem, and Willem Lommers, Breda, Netherlands, assignors to Algemene Kunslzijde Unie, N.V., Arnhem, Netherlands, a corporation of the Netherlands Filed Apr. 26, 1965, Ser. No. 450,723 Claims priority, application Netherlands, Apr. 30, 1964, 6,404,821 Claims. (Cl. 5752) This invention relates to dofling and more particularly to the dofiing of collection packages served by a continuously running yarn.

There are many situations in the textile industries where a yarn is fed from a source through a predetermined path to a point of collection. Threading in the yarns for such operation is time-consuming and requires the skill of an experienced operator. As a consequence, a problem is presented when the pot or bobbin receiving the yarn at the point of collection is filled and needs to be replaced by an empty one. This operation, which is called dotting, requires that the yarn running to the full package be severed and that the running end be connected to a new point of collection. In the past it has been necessary to guide the yarn manually to a point of temporary collection or to waste. In any event, the doll has involved a manual displacement of the yarn from its predetermined path to the temporary path occupied during the dofiing and has usually required that some or all of the predetermined yarn path be bypassed.

In the pot spinning of rayon yarns this problem is particularly acute, for there the pot must 'be dotted and the yarn introduced again into the funnel as the new pot is spun in. Ordinarily in rayon spinning this has been done by leading the yarn directly from the spin bath to waste so that at each dofi it is necessary manually to re-thread the whole system, involving the usual godets and guides as well as the funnel.

It is a purpose of the present invention to overcome the foregoing difiicnlties and to provide a method and apparatus for doliing in which the entire therading in of the continuous system remains undisturbed during the doff.

It is a further advantage of the present invention to provide a method and apparatus for entraining a yarn running through a predetermined path to a point of collection, bodily displacing the running yarn in a purely local region near the point of collection, replacing the filled yarn receptacle with an empty one, restoring the running yarn to its predetermined path and spinning in the empty yarn receiving receptacle automatically.

Other objects and advantages of the present invention will be apparent upon consideration of the following detailed description of an embodiment thereof illustrated in conjunction with a rayon pot spinning system. In the figures of drawing:

FIGURE 1 is a schematic view of a conventional pot spinning system showing the apparatus of the present invention in its repose or inactive position;

FIGURE 2 is a view of the apparatus of the present invention to an enlarged scale showing the same in its active or operating position; and

FIGURE 3 is a view in section taken on line 3-3 of FIGURE 2.

In FIGURE 1 reference numeral 1 is applied to a spinneret through which a bundle of viscose filaments are extruded into an acid spin bath 3. The delivery pipe for the unregenerated cellulose xanthate is indicated by reference numeral 2. The yarn extruded from spinneret 1 is withdrawn from the spin bath 3 and led over a ICC godet system composed of rollers 6 and 7 and from of tangency to roller 6 into the mouth of a funnel 9 centrally located in the top of a spinning pot 8. The spinning pot 8 is rotated by conventional means and the yarn 4 leaving the funnel 9 is laid up centrifugally in succeeding courses inside the pot. Although it is not shown, it is contemplat d that the funnel 9 will be provided with the usual traverse mechanism to reciprocate the same vertically to lay up courses of yarn within the pot.

In a region adjacent the yarn path between the godet 6, 7 and the mouth of the funnel 9 there is located entraining apparatus according to the present invention. It is contemplated that this entraining apparatus may be moved manually between a repose position, FIGURE 1 and a position intercepting the normal vertical yarn path between godet wheel 6 and the mouth of the funnel 9.

The entraining apparatus is illustrated in detail in FIGURES 2 and 3. It comprises a tube 10 having a straight portion 10A defining therein a radial slit 11 extending for the full length of the portion 10A. The straight portion 10A of the tube 10 connects and is integral with a portion 10B which has no slit. Portion 10B runs generally horizontally and at. right angles to vertical portion 10A. The connecting bend between them bears reference numeral 100.

Two

thread guides

14 and 15 are positioned at the opposite ends of the slit 11 in the tube 110. These thread guides are so shaped that they facilitate the threading in of the yarn 4 into the longitudinal slit 11, and moreover, insure that the yarn does not readily escape from the slit. 7

Around the portion 10B of the tube 10 there is provided a handle 16 in which there is located a handoperated stop-cock 17. The construction of the stopcock 17 is not illustrated because it is well known to those skilled in the art. It sufiices to say that the stopcock controls the flow of water from a flexible hose 18 to the tube 10.

When the spinning pot 8 is filled with a yarn cake, the doffing procedure is as follows:

The apparatus of FIGURE 2 is kept near the thread 4 in the zone between the roller 6 and the funnel 9 as on a hanger as shown in FIGURE 1. The operator now grasps the handle 16 and lift-s the apparatus olf of the supporting hooks. Then the apparatus is so manipulated that the thread 4 is guided into the hook-shaped thread guide 14 and along the edge of the disk-shaped thread guide 15 to be finally caught by the sector-shaped recess forming part of guide 15. By now opening the stopcock 17 with a pressure of the finger, a current of water is admitted to the tube 10, which exerts a tensile force on the thread 4 so that is is entrained in the portion 10A. Practically simultaneously the apparatus is displaced in transverse direction, as a result of which the thread 4 is moved to a region beyond the largest radius of the spinning pot 8. Subsequently, the thread 4 ejected from the tube 10 is severed from the yarn package collected in the spinning pot, after which the running yarn is ejected into a discharge trough (not shown). The entraining apparatus may be placed in a holder (not shown), so that the machine operator has both his hands free to replace the fully charged spinning pot by an empty one. During this replacing the thread 4 just continues running from the spinneret 1 over the rollers 6 and 7 and through the portion 10A of the tube 10 to waste.

When an empty pot has been put in spinning position, the operator again takes the dotting apparatus in his hands, so positions it that the portion 10A of the tube is in alignment with the funnel 9, the shape of the thread guide ensuring proper centering in the mouth of the funnel 9, and thus washes the yarn 4 down into the empty pot. The pot will now immediately start collecting the yarn 4. The moment the yarn 4 is being wound, the jet of water through the tube 10 is stopped.

The last stage of the dofling operation consists in that the yarn 4 is removed from the thread guide 14, and in that the dotfing apparatus is so displaced in transverse direction that the yarn 4 can leave it by Way of longitudinal slit 11.

The foregoing description illustrates the invention with reference to a pot spinning apparatus. It Will be clear that the apparatus according to the present invention can be used in a similar manner if the yarn is collected. Instead of in a spinning pot, on a rotating bobbin. This is one of the possible variants to the method according to the invention, which allows of many other variants.

It can now be seen that according to the present invention the yarn while it is running in its normal path to the point of collection is entrained in a stream of liquid. After the entraining is complete the yarn is severed adjacent the point of collection and the entrained yarn is bodily displaced to an appropriate Waste region. While it is running to Waste, the collecting package is changed. The supply of fresh yarn is not interrupted and it is not necessary to re-thread any part of the machine except the traverse for the collecting device which, in the illustrated form of the invention, is a funnel. Even after the tube 10 has been displaced from the position coaxially surrounding the normal path of the yarn running to the pot, the liquid flowing therethrough continues to exert a tension on the running thread. As a result, the thread will continue its course through the yarn path ahead of the tube without any disturbance at all.

The present invention is of particular advantage in conjunction with a spinning pot because in spinning in a pot it is necessary to wash the yarn into the funnel and this happens absolutely automatically when the tube 10 is brought back into registry with the funnel over the top of an empty pot.

If during the dofling there has been a considerable collection of waste, it is possible according to the present invention to cut the yarn running from the bottom of the tube 10 adjacent the guide 15 just before swinging the tube into registry with the funnel. The thread guide 14 functions to prevent the yarn from escaping from the longitudinal slit 11 when the tube 10 is being moved.

A specific advantage of the present invention is that the longitudinal slit may be located in a radial plane which is perpendicular to the plane in which the tube 10 lies. It has been found that if the longitudinal slit is so located, the liquid under pressure does not escape sideways through the slit 11.

In order to prevent the yarn, While being diverted to transverse direction, from escaping from the longitudinal slit, it is according to the invention recommended to provide two thread guides near the ends of the tube provided with the longitudinal slit.

During the dofling of the yarn collecting members the yarn withdrawn by the apparatus according to the invention may be guided into a closed vessel or be removed in any other way.

Manipulating the apparatus according to the invention may be faciliated if according to the invention around the tube with the closed wall there is provided a handle in which there is a hand-operated stop-cock for the current of liquid.

What is claimed is:

1. The method of dofling a collecting package fed by a yarn continuously running to it along a predetermined path that comprises flowing a steam of liquid parallel to and intercepting a portion of said yarn path in a region adjacent the collecting package thereby to entrain the running yarn in the liquid stream, severing the running yarn between said region of entrainment and the collecting package, bodily displacing said liquid stream and entrained yarn from said predetermined path, replacing the collecting package with an empty receptacle, thereafter restoring the liquid stream with the entrained running yarn therein to said predetermined path, reestablishing a collecting relationship to the free end of yarn, and discontinuing said stream.

2. Apparatus for entraining and bodily displacing a running yarn that comprises a tube having straight portion, a slit in a radius thereof extending for the full length of said straight portion, said tube having another portion extending at an angle from one end of said straight portion both portions of said tube being of uniform diameter, and means including a flexible portion to supply water to said tube through said other portion thereof.

3. Apparatus as claimed in claim 2 wherein said slit lies in a plane normal to the plane of said straight and said other portions of said tube.

4. Apparatus as claimed in claim 2 wherein said means includes a handle and a stop-cock to control the flow of water therethrough.

5. Apparatus as claimed in claim 2 wherein a thread guide is disposed adjacent each end of the straight portion of said tube.

References Cited UNITED STATES PATENTS 1,671,785 5/1928 Rushton 5734.5 2,661,588 12/1953 Griset 57-34.5 X 2,667,964- 2/1954 Miller 57-34.5 X 2,681,729 6/1954 Griset 5734.5 X 2,706,089 4/ 1955 Griset 242-18 2,844,859 7/1958 Griset 57-34.5 X 3,051,364 8/1962 Barnes et al. 5734.5 3,091,018 5/1963 Rees 57-140 3,156,395 11/1964 Ashby et al. 57-34.5 X 3,241,234 3/1966 Kiefer 5734.5 X

FRANK J. COHEN, Primary Examiner.

Claims

1. THE METHOD OF DOFFING A COLLECTING PACKAGE FED BY A YARN CONTINUOUSLY RUNNING TO IT ALONG A PREDETERMINED PATH THAT COMPRISES FLOWING A STEAM OF LIQUID PARALLEL TO AND INTERCEPTING A PORTION OF SAID YARN PATH IN A REGION ADJACENT THE COLLECTING PACKAGE THEREBY TO ENTRAIN THE RUNNING YARN IN THE LIQUID STREAM, SEVERING THE RUNNING YARN BETWEEN SAID REGION OF ENTRAINMENT AND THE COLLECTING PACKAGE, BODILY DISPLACING SAID LIQUID STREAM AND ENTRAINED YARN FROM SAID PREDETERMINED PATH, REPLACING THE COLLECTING PACKAGE WITH AN EMPTY RECEPTACLE, THEREAFTER RESTORING THE LIQUID STREAM WITH THE ENTRAINED RUNNING YARN THEREIN TO SAID PREDETERMINED PATH, REESTABLISHING A COLLECTING RELATIONSHIP TO THE FREE END OF YARN, AND DISCONTINUING SAID STREAM.