NL8103300A - TENSION-FREE YARN FEEDING SYSTEM. - Google Patents

Description

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Tension-free yarn feeding system

The invention relates to a tension-free yarn feeding system, in particular for introducing yarn into a high-speed yarn receiving device, and the invention therefore particularly relates to a substantially tension-free yarn feeding system.

The manufacture of various yarn products / which are made from a plurality of yarn threads is severely hampered by tension variations between the yarn ends. Characteristic of such a situation is the manufacture of intertwined yarns, as described in U.S. Pat. Nos. 3,846,968, 4,064 .686 and 4,223,520. As taught in these patents, a number of yarn ends are brought together and processed to provide a yarn "bundle" with 15 special features. Different intermittent tension between the different ends yields a different length of individual yarns , and as a result, the tight yarn end or the tight yarn ends form a core or are buried under the other yarns. At this shortcoming, the yarn end, which is under a greater tension than the other yarn ends, literally becomes the core of a yarn, with the other ends wrapped around it such yarn is considered defective and cannot be used for its intended end use. Due to the nature of the causes of uneven tension between the yarn ends, such unsuitable parts occur in the end yarn with irregular frequencies, resulting in large parts of the yarn or fabric are streaky and of poor quality.

The yarn ends are fed to a processing apparatus of cones, tubes, or knitted socks, which are stored in a sleeve. In the case of cones or tubes, the yarn is pulled off the cone or tube and passed through standard tension and motion interrupting members to the yarn processing apparatus, which, taking into account the latest state of the art, operates at very high speed. Similarly, in cases where the yarn is knitted into a so-called "sock" which is dyed, the sock is then 8103300 8% - 2 - is taken to guide the yarn from there over guide, tension and motion interrupting members. Variations in the tension of the yarn fed to: the yarn consuming devices are caused by ends which 5 jamming or rubbing against a dispenser, or, in the case of feeding from knitted socks, due to variations in the knit due to one layer on top of the other in the sock. Tension is also affected by the chemicals, gums and fixatives used to achieve color fastness.

In other types of yarn consuming devices, such as high speed looms, variations in the tension of the yarn fed to the loom can result in an unsuitable product.

It will therefore be appreciated that there is a need to provide yarn in a substantially tension-free state for yarn consuming devices, and especially high speed yarn consuming devices.

The main object of the invention is therefore to provide a means and a method for supplying substantially tension-free yarn from a yarn source to a yarn-consuming device, wherein the above and other such drawbacks do not occur.

Another object of the invention is to provide a means for supplying yarn substantially tension-free from a yarn source to a yarn-consuming device which is inexpensive to manufacture and efficient to use.

The invention also has for its object to provide a means for supplying substantially tension-free yarn from a yarn source to a yarn-consuming device which can be used for any type of yarn source.

Yet another object of the invention is to provide a means for supplying yarn substantially tension-free from a yarn source to a yarn-consuming device, which is particularly suitable for supplying a number of yarn ends to a device which yarn ends processed into a single bundle.

In addition, the object of the invention is to provide a method 8103300 *% - 3 - for supplying substantially tension-free yarn from a yarn source to a yarn-consuming device, which can be carried out easily and economically.

In accordance with the above objects, the invention provides a means for supplying substantially tension-free yarn from a tension source to a yarn-consuming apparatus, which includes yarn suckers and yarn collectors, the suction member subtracting one yarn end or a plurality of yarn ends from the source and throws it into the collecting member, from which the yarn consuming device takes the yarn ends in a substantially tension-free state. In a preferred embodiment, the device comprises a reel member located between the yarn source and the suction member for pulling off the yarn ends of the source.

In this preferred embodiment, the suction member can operate with a significantly smaller amount of air, improving the economy of the operation, as it only needs to provide enough tension on the yarn that is pulled off to wrap it tightly on the reel 20 , and toss the yarn on the collector.

The collector consists of a tapered collector, corresponding to a funnel, with the yarn entering on the wide side and exiting on the narrow side, with a deliberate accumulation of yarn in the collector. The large supply side of the collector is closed and the piston is fitted in the closure. Therefore, when the collector is full, yarn blocks the discharge side of the piston and stops pulling the yarn from the source until the collector is empty again.

The invention also relates to a method in which yarn is subtracted from a source and thrown into a collector, from which it is withdrawn by a yarn-consuming device under substantially stress-free conditions. The method and the device according to the invention are in particular suitable to be used for high speed yarn consuming machines of different types.

It should be noted that pistons or nozzles are commonly used to shoot weft looms in high speed looms. Such uses of pistons and nozzles are typically described in U.S. Pat. Nos. 3,575,217 and 3,865. 149 Yarn collectors are also known in the art for supplying a given yarn length to a jet nozzle for insertion into a high speed loom. The jet nozzle must, using a very high pressure liquid, shoot a length of weft yarn through the loom box.

A typical collector for supplying yarn 10 to a loom is designed to provide a length suitable for shooting through the loom art. Such collectors are typically described in U.S. Pat. Nos. 3,575,217, 3,799,212 and 3,865,149 as well as in Japanese Utility Model 15 Publication No. 2201/1969 and an article by A.A.Tuvaeva in the Russian magazine "Tekstil'naya Promyshlennost", _9, (1962), 53-59.

However, these collectors, although providing yarn in a substantially tension-free state, are primarily designed to provide a given yarn length. In other words, such collectors are used on an intermittent basis. On the other hand, the invention is used, if desired. used continuously.

The above objects will be described in more detail, and other objects will become apparent upon consideration of the detailed description below which refers to the accompanying drawings, of which

Fig. 1 is a schematic front view of the device according to the invention; Fig. 2 is a perspective view, partly schematically shown, of the invention, showing another embodiment of the reel member;

Fig. 3 is a schematic representation of another embodiment according to the invention; Fig. 4 is a flat plan view of another form of reel member that can be used in the invention;

Fig. 5 is a perspective view of yet another form of reel member useful in the invention;

Fig. 6 is a perspective view showing the actual 8103300-5 * * construction of the embodiment in Fig. 3;

Fig. 7 is a detailed vertical section view taken along line 7-7 in Fig. 6;

Fig. 8 is a vertical cross section of the suction member in Fig. 7;

Fig. 9 is a view, partly in side view and partly in vertical section, of the motor and reel member in Fig. 6;

Fig. 10 is a partial schematic side view of a yarn heaping apparatus in which the member of the invention is used;

Fig. 11 is a cross section of the mouthpiece member of Fig. 10;

Fig. 12 is another embodiment of the nozzle assembly 15 of Fig. 10; and

Fig. 13 is yet another embodiment of the mouthpiece member of Fig. 10.

In Fig. 1, the yarn source 10 is shown as a cone of wound yarn, although it will be appreciated that the yarn source may be any source known in the art. It will also be appreciated that a number of yarn ends 12 drawn from a number of yarn sources 10 and passed over conventional guide members 14 before entering the member of the invention. The member of the invention includes reel member 16, suction member 18 and collector 20. Reel member 16 is preferably high speed polished drive roller, which is continuously driven at a speed sufficient to pull yarn from the source and provide a continuous supply for the yarn consuming member at any speed at which the yarn consuming member attracts the yarn. Thus, roller 16 will rotate be kept at a speed slightly above the highest expected rate of yarn consumption in order to achieve sufficient kapaci When the yarn consumption is less than the highest quantity to be expected, its effect is an intermittent subtracting of the yarn from the source, although roll 16 is spinning continuously, the explanation of which will become apparent from the discussion below. The yarn 12 is preferably wound once around roll 16, although more than one turn 8103300 - ó - can be used.

From roll 16, yarn 12 passes to and through piston 18, which is essentially a jet nozzle, which draws the yarn inward and then forcefully ejects the yarn into collector 20, 5 from where it is attracted to the yarn-consuming device almost without tension.

It is important to note that reel 16 can be omitted when the air pressure in aspirator 18 is sufficient to pull the yarn from the source * 10 and toss it into collector 20. However, it is preferred that a reel member is used, avoiding the need for a very large volume of air from very high pressure to piston 18. When using a reel member, the air pressure to piston 18 need only be sufficient to apply tension to the yarn to hold the yarn on the surface of roll 16, after which the rotation of roll 16 will pull the yarn from the source.

In another embodiment, in another embodiment, a pair of rollers 22 and 24 are used as reel members. Yarn 12 runs over rollers 22 and 24, which are arranged in the same vertical plane and a short distance apart, with both rollers in the Rotate the direction of movement of the yarn. Yarn 12 is then wrapped around both reels and runs from there to piston 18, which is the same as the piston in Fig. 1. Yarn 12 then passes through piston 18 to collector 20. of collector 20, as indicated at 23, and the discharge side of piston 18 is provided in the closure. A number of holes 25 are provided in collector 20 to release the air that is blown in from aspirator 18. The yarn hopes accumulates in collector 20 and is drawn therefrom by eye 26 and, if desired, passes through tension member 28 as the yarn consuming device is pulled. Tension member 28 is used only as a small gauge Medium tension must be applied to the yarn which is fed to the yarn consuming device.

If the yarn feed speed to collector 20 is greater than the rate at which yarn is taken by the yarn consuming device, the collector will fill and 40 will block the outlet opening of piston 18, 8103300 ~ t * *** ί - causing the yarn flow The yarn between piston 18 and reel 16 then hangs slack and the yarn wrapped around the reel or reels forming reel 16 will then slip on the reel or reels, causing the yarn to be pulled off will come to a standstill from source 10. Thus, as an important aspect of the invention, no complicated measuring means or controllers are required.

Although the suction section of the system is designed for automatic operation, it may be necessary for some applications to further limit the amount of yarn present in the collector at any time. This can be done by using light-emitting diodes or pressure sensitive air logic controllers, which are positioned at max-min points in the collector passage, so that the suction air valve is opened in the min position, closed in the max position and reopened when the thread supply has decreased to the min position .

Since most large factories that use or manufacture yarn use a number of yarn processing machines, it is preferable to provide a yarn supplying means under substantially tension-free conditions which can supply the yarn to a number of yarn consuming machines.

Fig. 3 shows an embodiment in which this is done in which four collectors 20a, 20b, 20c and 20d are combined and each collector is provided with a suction piston 18a, 18b, 18c and 18d, respectively. Yarns 12a, 12b , 12c and 12d are subtracted from their matching sources, respectively, and passed over a single roll 16.

For convenience, Figures 1 and 2 show a single yarn end which is fed into the member from a single source. In Figure 3, for convenience, only one of the collectors is shown with a supply of a number of yarn ends 12a, all of which meet at piston 18a and exit 35 as four separate tension-free yarn ends.

Reel member 16 is shown in its preferred embodiment as a single reel and in another embodiment as a dual reel. Optionally, reel member 16 may be a typical windlass drum as shown at 30 in FIG.

40 4, or, as shown in Fig. 5, a pair of rollers 32 and 34, 8103300 * - 8 - arranged so that their hearts are offset slightly relative to each other. Rollers 32 and 34 interlock so that they are opposed In this way, yarn 12 arrives on roll 32 and runs around 270 ° around it, then goes to roll 34. and 5 runs around 270 ° around it, and from there goes to suction member 18.

Figures 6-9 show the best known method of carrying out the invention, which is known to us, wherein reel member 16, suction member 18 and collecting member 20 are arranged on a bottom plate 36. Reel member 16 contains a motor 38 and drive coil or drum. 40. Motor 38 is mounted on bottom plate 36 using a mounting bracket 42, bolts 44 and 46. Drive coil 40 is mounted on a rotating shaft 48 of motor 38 by means of a pin 50 and set screw 52.

Suction member 18 includes a manifold 54, in which longitudinally drilled air manifold 56. A number, in the present case, four suction nozzles 58 are mounted in manifold 54 and held in place by adjustment cover 76 of a transparent material, such as an acrylic plastic so that an operator can observe the yarn passing through the collector.

In Fig. 8, it can be seen that suction nozzle 58 has a passageway 82 which intersects near the exit opening with opening 84. The outer wall of the mass of nozzle 58 is generally cylindrical, but there is a flat, tapered inner surface 86 terminating at shoulder 88, forming an air chamber that communicates with manifold 56. Orifice 84 is drilled through the wall of nozzle 56 from shoulder 88 to passage 82 at an angle so that the air passing through orifice 84 is directed to the center of exit port 90 of passageway 82. In this way, a venturi effect is established when the high pressure air from port 84 is ejected at high speed into passageway 82 creating a negative pressure in tube 64 and passageway 82, 35 through which yarn is drawn through the suction.

Passage 82 is preferably tapered with the largest diameter on the entry side and the smallest diameter on the exit side. When manufacturing nozzle 58, we cleared passage 82 to provide nozzles in three different sizes. The first had a taper which runs from 8103300 ~ 9 - 0.338 cm on the small side to 0.424 cm on the large side. The second had a taper ranging from 0.376 cm on the small side to 0.467 cm on the large side. The third had a taper ranging from 0.419 cm on the small side to 0.508 cm 5 cm on the large side. Regardless of the size of passage 82, an opening 84 having a diameter in the range of 0.159-0.079 cm is suitable. Angle may lie in the range of 11 ° -15 °.

The different dimensions are not critical to the invention; the important factors to be taken into account are the combination of dimensions and air pressure which will provide the desired effect, while preferably keeping the air consumption as low as possible, since compressed air is a costly product. dimensions provide satisfactory results, we have found that the most satisfactory configuration of the suction nozzle is a configuration whose taper ranges from 0.376 cm to 0.467 cm, the opening has a diameter of 0.079 cm and angle 20 = 11 °. It is best used at an air pressure of 4.2 kg / cm, which conveys 1.78 m / h air under these conditions. Under these conditions, the tension on the yarn is also 8.29 g.

The entire unit is shown in Fig. 7, mounted on a pedestal 92, although it will be apparent to those skilled in the art that it may be arranged on a table or other known support in any suitable manner.

As noted above, the inventive device is particularly useful when used in combination with an intermittent bulking yarn apparatus as disclosed in U.S. Pat. Nos. 3,846,968, 4,064,686, and 4,223,520. Nevertheless, the apparatus is briefly discussed herein for a better understanding of how the invention works.

In Fig. 10, the device according to the invention is schematically shown at 94. The yarn 96, exiting device 94, passes through the feed rollers 98 after passing through yarn guide 100. The yarn then passes through air nozzle 102, which is provided is from a longitudinal bore and at 40 air supply 104 from air supply 106. The intermittently loose yarn 81 • 81 03 3 0 0 - JO ”made from nozzle 102 passes through the take-up rollers 110 and yarn guide 112 to a yarn take-up member 114. Although the take-up and take-up rollers 98 and 110 are schematically shown as a three-roll assembly, any known arrangement can be used.

Air specimen 102 can be selected from a number of specific shapes. In Fig. 11, an embodiment of the air nozzle is shown. In this embodiment, a housing 116 is shown with an insert 118, which is provided with a longitudinal bore 120 through which the yarn can go. Insert 118 is provided with a pair of diametrically opposed air passages 122, which are at right angles to the longitudinal bore 120. In housing 116 there are a few air ducts 124, which are in are connected to air passages 122. A pair of eyelets 126 are provided on the inlet and outlet side of the through bore. The yarn ends 12 enter one end of bore 120 and the air exiting from the air passages 122 enters. collision in the chamber. As the yarn exits the through bore as shown in Fig. 12, it is provided with alternately thickened areas 128 and mutually entwined regions 130 previously described as "entwined" and "entwined".

In Fig. 12 another embodiment of the nozzle is shown, in which the through bore is provided with a pair of coaxial chambers 132 and 134. Chamber 132 has a larger diameter than chamber 134 and is provided with a tapered side 136, where they merge. In this embodiment, as in the embodiment of Fig. 1, a pair of eyelets 138 are provided on each side of the through bore to reduce wear.

The embodiment of Fig. 13 is very similar to that of Fig. 12. The main difference is that now there is only a single air inlet 124, and, as shown in Fig. 13, no eyes are fitted. however, one skilled in the art knows that one or both eyes can be removed or used as desired, and although two different types of eyes are shown in Figure 12, both eyes may be of the same type.

8103300

Claims (23)

1. Device for supplying substantially tension-free yarn from a yarn source to a yarn-consuming device, characterized in that it comprises a yarn suction member and a collecting member therefor, the suction member subtracting at least one yarn end from the source and that throws yarn into the collecting member, from where the apparatus draws the yarn ends into a substantially tension-free state. 2. Device as claimed in claim 1, characterized in that it also comprises a device for applying a small, uniform tension to the yarn ends for control while they are attracted to the device. 3. Device as claimed in claim 1 or 2, characterized in that the suction member is located on the inlet side of the collecting member, whereby, when the collecting member is full of yarn, the outlet of the suction member is blocked so that the supply of yarn from the source is stopped. 4. Device according to one or more of the preceding claims, characterized in that the collecting member consists of a tapered collector, the largest end of which is the supply side and the smallest end of which is the discharge side, and the supply side of the collector is closed by a closing member provided with an opening through which the suction member throws the yarn. 5. Device as claimed in one or more of the foregoing claims, characterized in that it also comprises a reel member located between the yarn source and the suction member to pull the yarn ends off the source. 6. Device as claimed in one or more of the foregoing claims, characterized in that the reel member is provided with a continuously high-speed, polished drive roller around which the yarn is wound, wherein the piston then applies forward tension to the yarn wrapped around the roll. Device according to claim 6, characterized in that the reel member is provided with a pair of spaced continuously driven high speed, polished drive rollers of which the axis of rotation is offset in the same vertical plane 8103300-12), and the yarn is introduced into one of these rolls, is wrapped around both rolls, followed by a wrap around the other roll, and then leaves that other roll in a location between the rolls. 8. Device as claimed in claim 7, characterized in that both rollers rotate in the direction of movement of the yarn. 9. Device as claimed in claim 5, characterized in that the reel member is provided with a pair of rollers which interlock so that they rotate in opposite directions, the axis of rotation of these rollers being offset from each other, so that yarn which is fed over one of these rollers and comes off the other roll, contacts each of these rollers at 270 ° along its circumference. 10. A method of supplying substantially tension-free yarn from a source to a yarn-consuming apparatus, characterized in that a number of ends of the yarn are pulled off the source, passed through a suction member, and the yarn ends in a collector from which practically tension-free yarn can be pulled through the appliance. 11. A method according to claim 10, characterized in that the pulling of the yarn from the source is selectively stopped by arranging the suction member and the collecting member such that when the collector fills up with yarn, the discharge side of the suction device is blocked by the yarn, so that the suction device no longer attracts yarn. 12. Apparatus for intermittently bulking yarns, characterized in that it comprises a suction member, a yarn collecting member, the suction member subtracting a number of yarn ends from a yarn source and throwing these yarn ends into the collecting member; - an input roller member for extracting the yarn ends from the collecting member; a nozzle with a bore extending longitudinally therethrough, through which the yarn ends are passed, at least one air passage of which intersects this bore at a right angle thereto, whereby the air colliding with these yarn ends interweaves these yarn ends at mutually spaced points, whereby intermittently bulky 8103300 - 13 - made yarn, and a take-up roller to pull this bulky yarn from the nozzle. 13. Apparatus according to claim 12 / characterized in that the through bore is provided with a largest diameter portion on the inlet side thereof and a smallest diameter on the outlet side thereof. Device as claimed in claim 12 or 13 / characterized in / that it is provided with an air passage. Device according to claim 12 or 13, characterized in that it comprises a pair of diametrically opposed air passages. 16. Apparatus according to one or more of claims 12-15, characterized in that it also comprises a means for applying a small uniform tension to the yarn ends for control, which is placed between the collecting member and the supply organ .. 17. Device according to one or more of claims 12-16, characterized in that the suction member is arranged on the inlet side of the collecting member, whereby, when the collecting member is full of thread, the discharge of the suction member is blocked, which stops the supply of yarn from the source. 18. Device according to claim 17, characterized in that the collecting member is a tapered collector, the largest side of which is the inlet side and the smallest side is the outlet side, the inlet side of the collector being closed by a closing member, and the closing member is provided with an opening through which the suction member throws the yarn. 19. Apparatus according to any of the claims 12-18, characterized in that it further comprises a reel member disposed between the yarn source and the suction member to pull the yarn ends off the source. 20. Apparatus according to claim 19, characterized in that the reel member is provided with a continuously driven, high speed, polished drive roller around which the yarn is wound, the piston then applying forward tension to the yarn wound around the roller. . 81 03 3 0 Ö * * V - 14 - Device according to claim 20, characterized in; that the reel member is provided with a pair of spaced, continuous driven, high speed, polished drive rolls, the axis of rotation of which is offset in the same vertical plane, and the yarn being fed over one of these rolls, around both said rolls is wound, and the other roll exits at a location located between the two rolls. Device according to one or more of claims 12-21, 10, characterized in that both rollers rotate in the direction of movement of the yarn. 23. Device according to one or more of claims 12-21, characterized in that the reel member is provided with a pair of rollers which interlock so that they rotate in opposite directions, the axis of rotation of these rollers is staggered so that yarn fed over one of these rolls and coming off the other roll is in contact with each of these rolls by 270 ° along its circumference. 81 0 3 3 0 0