US3309124A - Method and device for joining two opposingly directed yarn ends by a weaver's knot - Google Patents

Description

March 14, 1967 s. FURST 3,309,124

METHOD AND DEVICE FOR JOINING TWO OPPOSINGLY DIRECTED YARN ENDS BY A WEAVER'S KNOT Filed Jan. 18, 1965 v 3 SheetSSheet 1 ar h 14, 19 7 s. FURST 3,309,124

METHOD AND DEVICE FOR JOINING TWO OPPOSINGLY DIRECTED YARN ENDS BY A WEAVER'S KNOT Filed Jan. 18, 1965 3 Sheets-Sheet 2 March 14, 1967 s FURST 3,309,124

METHOD AND DEVICE FOR JOINING TWO OPPOSINGLY DIRECTED YARN ENDS BY A WEAVER'S KNOT Filed Jan. 18, 1965 5 Sheets$heet 5 INVENTO/P Unite States Patent Ofifice 3,309,124 METHOD AND DEVICE FOR JOINING TWO OPPDSINGLY DIRECTED YARN ENDS BY A WEAVERS KNOT Stefan Fur-st, Monchen-Gladbach, Germany, assignor to Walter Reiners, Monchen-Gladbach, Germany Filed Jan. 18, 1965, Ser. No. 426,716 Claims priority, application Germany, Jan. 18, 1964, R 37,002 5 Claims. (Cl. 289-15) My invention relates to a method and device for joining two opposingly directed yarn ends by a weavers knot. As a rule, yarn knotting devices, as employed in textlle machinery and known, for example, from US. Patents 2,981,559 and 3,110,511 produce a fishermans knot.

There are also known devices for joining two yarn ends by a weavers knot with the aid of a tie beak. These devices require that the two lengths of yarn to be knotted together extend parallel beside each other when being inseited into the knotter with both yarn ends pointing in the same direction so that they can be jointly knotted at the same time. While in this manner the knot can be produced with very simple means, the known devices are not applicable if two opposingly directed yarn ends are to be joined together, as is preferable for knotting devices in yarn-package winding machines in which a lower thread coming from a yarn supply coil is to be tied together with an upper thread coming from a take-up spool. If the two yarn ends thus pointing inopposed directions Were to be tied together in the known manner to a weavers knot, the wrong ends would be pulled tight, the knot would fail to be self-locking, and the yarn ends would be pulled apart.

It is an object of my invention to provide a method and a device which affords joining two yarn ends by a weavers knot with the aid of a tie beak despite the fact that the yarn ends point in opposed directions.

Another, related object is to render a weavers knot producing device, and thereby the advantages of its relatively simple design and small size, applicable in yarnpackage winding machines and for similar textile fabricating purposes where it is necessary or desirable to pass the two lengths of yarn from opposite directions into engagement with the knotter.

According to the invention, the tying method is performed by first engaging one of the two yarn ends with the tie beak and forming this yarn end into a loop by rotating the beak. Thereafter the second yarn end is placed into engagement with the same tie beak and knotted together with the first, loop-forming end.

It is by a virtue of the fact that a loop is formed in one of the two yarn ends before commencing the knotting operation proper of the tie beak, that the known simple method for joining yarn by a weavers knot, as Well as a correspondingly simple knotter device, become applicable also in cases where the two yarn ends point in opposite directions respectively.

The method according to the invention is performed in a particular simple manner by turning the tie beak first 180 about its axis before either yarn end is placed into engagement with the beak, then engaging one yarn end with the beak and turning the beak back into the starting position so that it forms a loop in the one yarn end only. Thereafter the second yarn end is placed into engagement with the beak, which is then rotated again in the forward direction to form a weavers knot joining the looped yarn end with the second yarn end in the manner known as such.

The method according to the invention is preferably performed with the aid of a device in which the movement of members for guiding the respective yarn ends into the operating range of the tie beak is coupled with the move- 3,13%,124 Patented Mar. 14, 1967 ment of the tie beak in such a manner that at the beginning of the tie-beak rotation only one yarn end and, after a given rotation of the beak, the other yarn end is supplied to the tie beak.

According to another, more specific feature, the tie beak has a coaxial shaft controlled from a cam mechanism which also controls the movement of the yarn-guiding members.

According to still another, prefered feature the tie-beak shaft is formed as a helix or worm engaged by a driving member of the cam mechanism which also controls the yarn-driving members so that a single movement of the cam mechanism in the given direction causes the respectively different rotational movements of the tie beak while simultaneously controlling the correlated movements of the yarn-guiding members.

The above-mentioned and other objects, advantages and features of my invention, said features being set forth with particularity in the claims annexed hereto, will be apparent from and will be mentioned in, the following with reference to an embodiment of a weavers-knot tying device according to the invention illustrated by way of example on the accompanying drawings in which:

FIGS. 1 through 11 are explanatory diagrams relating to different steps of the method according to the invention resulting in the formation of a weavers knot for joining two opposingly directed yarn ends.

FIG. 12 shows, partly in section, in accordance with FIGS. 1 to 11.

Shown in FIG. 1 is a tie beak 1 of rest. A length of yarn F to be tied together with another yarn end, is located in front of the tie beak.

In the stage shown in FIG. 2, the yarn F is moved into engagement with the tie beak 1. In the meantime the beak has performed a rotation about its axis. In FIG. 3, the beak has rotated so that its two jaws 1a and 1b, which in FIG. 1 point toward the viewer, are now pointed in the opposite direction.

Now with the tie beak at rest, the yarn is moved back to the position of FIG. 1, so that the yarn F now occupies the slanting position shown in FIG. 4. Thereafter the tie beak is rotated in the reverse direction back to the position of FIG. 1. As a result the annular loop illustrated in FIG. 5 is formed in the yarn F When this stage is reached, the second yarn end F coming from the opposite direction with respect to that of yarn end F is moved into engagement with the tie beak 1 so that it occupies the position shown in FIG. 6.

The tie beak is then again rotated in the forward direction. FIG. 7 shows the tie beak after a rotation of 90. It will be seen that now the formation of a knot, joining the two yarn ends, commences. In FIG. 8, the tie beak has further rotated up to 270. It will be seen that the two jaws 1a and 1b have opened in order to seize the free portion of yarn end F and to cut it off during further 90 rotation of the beak. This further rotation of 90, resulting in a total rotation of the beak through 360 is shown in FIG. 9, although, for the purpose of illustration, from a different viewing direction. FIGS. 10 and 11 show the same stage of the tie beak as FIG. 9, but from respectively different viewing directions in order to permit representing how the prepared knot is being stripped off the tie beak. During this preparation, the free portion of yarn end F is cut off by shears or similar cutters in known manner, this being schematically indicated in FIG. 10. In FIG. 11 the fully prepared weavers knot is almost entirely removed from the tie beak. It is then only necessary to pull the yarn ends apart from each other for tightening the knot.

In the illustration of the device according to FIG. 12, the tie beak 1 and the yarn ends F and F correspond to the beak and yarn ends denoted in FIGS. 1 to 11 by a knotter operating in its normal position the same respective reference characters. The yarn ends F and F are inserted into respective guiding notches or two lateral Wall plates 2 of which only the one located in the rear is visible, the front plate being omitted to prevent obscuring of other components. The device further comprises two yarn guiding members 3 and 4 which are rotatable about a pivot pin 5 and are pressed by springs 6 and 6a against the cam contours of respective cam discs 7 and 8. The two cams 7 and 8 are rigidly connected with each other and are rotatable about a shaft 9 mounted on the side plates 2. A spring 10 biases the two cams 7 and 8 against a control cam 13 mounted on a shaft 11 and rotating counterclockwise, as indicated by an arrow 12, when the knotter is in operation. Firmly joined with the cams 7 and 8 is a slitted bar 14 whose slit engages a helix 15 formed of twisted fiat bar material. The helix 15 serves as the shaft of the tie beak 1 and consequently extends in coaxial relation to the tie beak.

As will be seen from FIG. 12, the helix 15 is given such a shape that when the slotted bar 14 turns about pivot 9 toward the right, the tie beak 1 will first perform a rotational motion about approximately 180 in one direction, then a rotation of 180 in the reverse direction, and thereafter a rotation of 360 in the first-mentioned direction. When the slitted bar 14 has almost reached the righthand end of the helix 15, it abuts against a shoulder 16 of an ejector lever 18 rotatable about a pivot pin 17. The bar 14 then turns the ejector lever 18 counterclockwise about pin 17 until the lever reaches the position shown by dot-and-dash lines, the corresponding ultimate positions of the bar 14 and the cams 7 and 8 being also shown in this manner.

The operation of the device is as follows. When a knotting operation is to be performed, the cam 13 on shaft 11 is driven to perform a single forward rotation according to arrow 12. The cams 7 and 8 on pivot shaft 9 now rotate clockwise. The slitted bar 14 acts on the helix 15 and imparts the above-described rotational motion to the tie beak 1. At the same time, the cams 7 and 8 separately control the guiding members 3 and 4 to supply the yarn ends F and F to the tie beak 1 in the desired sequence, also as described above. It will be recognized that during rotational motion of the cams 7 and 8, the yarn guiding member 3 first runs onto a lobe of cam 8 which rotates the guide member 3 counterclockwise about its pivot 5. The guide member 3 then engages the yarn F and moves it toward the tie beak 1. After the tie beak 1 has formed a loop in yarn F in accordance with FIGS. 1 to 5, the guide member 4 runs onto a lobe of earn 7 so that now the member 4 seizes the yarn F and moves it into engagement with the tie beak 1. In the meantime, the tie beak 1 has first rotated 180 in one direction and thereafter 180 in the opposite direction so that it now can perform the knotting movement in accordance with the helix 15, namely a rotation of 360 in the first-mentioned direction. Shortly before the tie beak reaches the end position, the slitted bar 14 actuates the ejector 18 which pulls the prepared knot off to a tie beak 1.

It should be understood, that with the exception of first forming a loop in one yarn end prior to commencing the knotting operation proper, this knotting operation as such is performed in the manner known as such. The supply of the yarn ends to the knotter or the clamping of the yarn ends in the proper position, may also be achieved in the manner known from other knotting devices, for example by having the yarn ends frictionally clamped between the side plates 2 of the knotter and the respective yarn guiding members 3 and 4. With respect to further details, known as such and not essential to the present invention proper, including the mounting of the described knotter in a yarn-package winding machine, reference may be had, for example, to the above-mentioned patents or to the copending applications of Raasch et al., Ser. No. 307,077, filed Sept. 6, 1963, now US. Patent 3,220,758 and Wilms et al., Ser. No. 371,697, filed June 1, 1964 of common ownership.

To those skilled in the art it will be obvious, upon a study of this disclosure, that my invention permits of various modifications and hence may be given embodiments other than particularly illustrated and described herein, without departing from the essential features of my invention and within the scope of the claims annexed hereto.

I claim:

1. The method of joining two opposingly directed yarn ends by a weavers knot with the aid of a tie beak, which comprises first engaging only one of the yarn ends with the tie beak and forming an annular loop in the yarn end, then additionally engaging the other yarn end with the tie beak and knotting both yarn ends to a weavers knot by rotation of the beak.

2. The method of joining two opposingly directed yarn ends by a weavers knot with the aid of a tie beak, which comprises rotating the tie beak idle about its axis in a given direction through about from a starting position, engaging only one of the yarn ends with the tie beak and rotating the tie beak in the reverse direction back to the starting position and thereby forming a loop in said one yarn end, thereafter additionally engaging the other yarn end with the tie beak and knotting both yarn ends to a weavers knot by rotation of the beak in said given direction.

3. A knotting device for joining two opposingly directed yarn ends by a weavers knot, comprising a tie beak rotatable about its axis and having a given starting position; beak actuating means for rotating said beak in a sequence having a first stage of about 180 forward rotation from said starting position and a second stage of reverse rotation back to said starting position and a third stage of knot-forming forward rotation from said starting position through approximately 360; yarn guide means comprising two members engageable with the respective two yarn ends and individually movable for shifting said yarn ends into engagement with said tie beak, and sequence control means in connection with said beak actuating means and said guide members for sequentially moving said two members to engage one yarn end with said tie beak between said first and second stages of beak rotation for causing said beak to form a loop in the first yarn end and to additionally engage the second yarn end with said beak between said second and third stages for causing said beak to tie the weavers knots.

4. In a knotting device according to claim 3, said sequence control means comprising a cam mechanism having cam means engaged by said guide members for controlling the latter, and drive means connecting said cam means with said beak actuating means.

5. In a knotting device according to claim 4, said beak actuating means comprising a helical member coaxially joined with the tie beak to form a shaft therefor, said drive means being in engagement with said helical member for rotating it when said drive member moves axially of said helical member.

References Cited by the Examiner UNITED STATES PATENTS 2,125,423 8/1938 Bromley et al. 289-3 2,678,229 5/1954 Shortland 289-3 3,017,211 1/1962 Trost 289-3 MERVIN STEIN, Primary Examiner.

L. K. RIMRODT, Assistant Examiner,

Claims (1)

1. THE METHOD OF JOINING TWO OPPOSINGLY DIRECTED YARN ENDS BY A WEAVER''S KNOT WITH THE AID OF A TIE BEAK, WHICH COMPRISES FIRST ENGAGING ONLY ONE OF THE YARN ENDS WITH THE TIE BEAK AND FORMING AN ANNULAR LOOP IN THE YARN END, THEN ADDITIONALLY ENGAGING THE OTHER YARN END WITH THE TIE BEAK AND KNOTTING BOTH YARN ENDS TO A WEAVER''S KNOT BY ROTATION OF THE BEAK.

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