US1719883A - Knot-tying mechanism - Google Patents

Description

July 9, 1929. D, @RAVEL 1,719,883

xNoT TYING uEcHANIsM Filed uarcn 12, 1925 z sheets-sheet 1 @Hill July 9, 1929 D. GRAVEL 1.719.883

KNOT TYING MECHANISM Filed March 12, l1923 2 Sheets-Sheet 2 iwf@ Illll l Imill El Izzi/enfer.'

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Patented July 9, 1929.

VP'TENT oFFicE.

DAVIDGIAVEL, OF CHATTANOOGA, TENNESSEE, ASSIGOR TO BARBER-COLMAN COMI- i PANY, 0F ROCKFORD, ILLINOIS, A CORPORATION OF ILLINOIS.

KNOT-TYING MECHANISM.

.Applicationv led March 12,v 1923. Serial No. 624,403.

The invention relates to knot-tying mecha 4nis-ms such as 4ure commonly employed iu textile mills for the purpose of uniting threads; and it'has particular reference to a device of this character which is capable oi tying a small flat knot such as is ordinarily termed in the art a weavers knot.

Numerous eli'ortshave been made in the past to produce a ractical knetter for tying the true weavers rnot, or a variant thereof,

' but Isuch devices have met with limited com- -mercial success for-various reasons, chief among Awhich is the fact that it has been hard to hold the parts of the knot from improper shifting movement during the operation of the knofter, this trouble being perhaps due to the vdiliieulty in maintaining the correct degree of tension on the various strands. y Y

It is the object of my invention to produce an implementato the weavers knotter type which shall be of a thoroughly -practical character'by reason of the reliability with which it holds and operates upon the threads.

.'Animportant object of the invention is to produce .anl implement of this character which `is comparatively simple in construction.. Y Y

In vthe accompanying drawings, Figure 1 is a side elevatlon of my improved knotter, illustrating-the manner in which the device is mounted Vupon thehand ofthe operator. Fig. 2 isa fragmentary elevational view taken from the opposite side of the knotter.

Fig. 3 is a fragmentary plan view. Figs. 4 and 5 are fragmentary views illustrating details of construction. Figs-6, 7 and 8 are views similar to Fig. 3 but showing the parts in different relativepositions. Fig.'9 is a detail hview somewhat diagrammatic in character and.illustrating the knot just as it is about to be completed. Fig. 10 is a det-vail view of the completed knot but before it is drawn taut. g

It will be observed that I have illustrated only one embodiment of'the invention. It is contemplated, however, that various changes inform, construction and arrangement of parts may be made by thoseskilled in the art `without departing from the spirit and scope of the invention as expressed 1n the appended claims.

,I have herein shown a hand knotter of the general type disclosed in Patent No. 75 3,110

dated March 22, 1904. The present knetter comprises a tying bill to form the loops-of the knot and to shear one of the threads; means for tightening the loops of the knot and stripping the knot from the tyingbill; means for holding and guiding the threads 1n proper position for the knot-tying operation; and a shear for .severing the other thread. The two threads to be united are herein referred to asa bobbin thread and a spool thread, but these terms are not to be understood as limitations of the invent-ion. The thread marked bobbin thread on the drawingmight be the spoolthread, and the spool thread might be thebobbn' thread.

It may be here remarked that for the sake of clearness the-diameter of the threads has Vbeen exaggerated in tle views.

Referring now to the drawings, the implement embodies a handle A `and a strap A' together forming a loop whereby thek device may be supported upon the hand of the operative. -A standard A is rigidly 'fixed to the handle A and is provided with bearings .for the shaft C3 (Fig. 8) of the tying bill C5. Said tying bill is provided with a pivoted shearing and clamping jaw C14 arranged to be moved to open and close the tying bill by means of a cam barrel C. The

tying bill and its shearingr and clamping jaw from the tying bill comprises a thread-hold ing arm E pivoted to swing on the axis D. The forward end of said arm is in the form of a hook E2 to receive one of the threads to be tied, for example, the thread extending from the bobbin. A coiledspring'E3 (Fig. 1) tends to hold the arm Ein its initial position, such position being determined by contact of the arm with a stationary stop A (Fig. 3).

' the loops of the knot and stripping the knot A thread-clamping arm D", provided at its forward end with two upwardly-extending clamping lfingers 1)",1zthat lie at opposite sides offatlie holding 4arm E, pivotedr'at its rear end to one arm of zi b'cll crank D* ot the'bellv crank'is provided with'a 4rollerstud that liesv in a cam-groove ll (Fig. 8) formed in an arcuate iange B which is-Iixed with relation to the gear segment B7.A The shape of the cam groove-B is such as to cause the bell crank D" 'to swing hack and forth in cachstroke of the thumb fork B5. During the operating (i. e. downward) stroke of the thumb fork, the arm D is advanced so as to cause the fingers l)7 to clamp the thread lying in the hook E2 of the arm E. As the arm D advances, a spring latch E* (Fig. 6) on the arm E engages a stud D on the bell. crank D, so that when the molement ofy the 'bell crank is reversed the arm E is caused to move with the bell crank and the arm D (as in Fig. 6), in which movement the said arms swing laterf ally away from the tying bill to tighten the loops of the knot and strip the knot oit' the. tying bill.A As the thumb fork completes its operativestrokd the spring latch E4 is disengaged from thepin D by means of a trigger pin E carried by theflatchrand adapted to engage with a stop pin A on the standard A (Fig. 8). Y At the" side ofthe ytying bill, opposite 4to the arms E and DG, is a stationary thread guide. C19 for the thread'extending from the s iool. v

1All of the parts thus far described are substantially identical with the parts bearing corresponding reference. characters in the l)efore-mentioned patent, with the exception of the hook E. which is speeiall y constructed and arranged in a manner which will presently appear. r1 v Cooperating with the thread guide C for supporting the thread extending,r from the spool, is-a guide formed at the forward end of the arm D by'means of an ups-tending `linger 11 (Fig. 2) spa'ccda short distance inwardly from the fingers D. It will be observed that in the movement. of the. arm D", said thread guide is carried forwardly, the finger 11 .near the end of such forward movement coacting with an upstanding tinger 12 located near the forward end of the arm E and spacedinwardly from the hook `2. The lingers D"coacting with the opposite sides of the hook E2 constitute a clamp for the bobbin thread lying within the hook; but the finger 11 not being doubled, as in the case of the fingers D?, reacts with the Enger 12 to position the spool thread, but. without clamping it therebetween. Accordingly, the spool thread is permitted to move relative to the guide 11 in the tying operation. The primary function, therefore, Aof the guide is t-o hold the spool-thread in propbill. through the hook E2 isV passed or looped he- Yhand the tying billI (see Fig. 3), and then er relation to the tying bill for theinitial yloop-forxnin r operation,iand .-then to move `'the fspool'f t lread forwardly?- adjacent Vthe V yguide hook E for the stripping operation that. swings en thc axis D. 4The other'arm but without placing any tension on,` the thread. ,'.lhereasonor 'avoiding tension on this thready isthatit results in the produc- "tion-of a slip knot.

'lhe means for supporting the hohhin thread -xn'ayfcomprise a bracket 13 (Fig. G) rigid with the standard A and profs-.ting forwardly and then laterally into an inclined position directly in front of the t ying The `bobbin thread after passing Vis brought forwardly to the bracket 13 where 1t 1s placed ln a-combined guide and shear 'device designated generally by the numeral 14. This device comprises a stationary plate v15l (Figs-1 and 4) -havmg an upstanding `lmger or shear blade. 16. 'A movable shear blade 17 is rigid with an arm 18 pivoted at 19" and provided with an inwardly pro- Ajectng vfinger-i2() at.` lts-lower end.

Said linger is' arranged-to be engaged by 'the hi- 'furcatedend 21 'of'a lever 22 ivoted upon a'-post`23earried byfthe `brac cet 13. The opposite for in'nerend of said. lever is beni. downwardly for engagement with the arm '24 ot'the'segment B1 andalso with a hooked member 25l carriedb "the thumb fork Bf'. It. will thus' seenft at' the shear blade 17 is arranged to be reciprocated in the rockin'r movements ofthe gear segment, the arrangvv 1 ment heing'fsuch that lnear the end of th\` downward'movementof the thumb fork li', the shear 14 seversthe thread held thereby: and in the return movement of the thumb fork the clamp is'opened to receive a new thread.

`Assmning now that-it is desired tounite two threads, for example, a bobbin thread and a spool thread,'they are placed in the knetter substantially in the relation shown in Fig.`3. One 'manner of accomplishing this resultis to lay the ends of the two threads parallel across the palm of the hand with the lingers toward the body and with the bobbin thread nearest thev ends of the lingers. The threads'arethen placed in the guides E2 and 11, as shown-in Fig. 6. Now by inverting thc p'alm, the bobbin thread may readily be passed behind the bill Cs and the spool thread in front of it. vThe free ends` of -the threads are then manipulated so that the end of thebobbin thread is placed in theshear 14 and the cnd'of the spool thread'lies in the thread guide C. Thus, the threads are crossed `and recrosscd upon o posite 'sides of the tying bill tlriat the formation of a pair of over ping loops a and b is initially effected. T e thumb fork Bs is now depressed, thereby r0- tating the tying bill in a counterclockwise lll (Fig. Bso

direction. By reason of the relative location of the ortions ofthe threads leading to thel bobliin and the"'spool respectively, as shown-in Figs. Sand 6the'tying bill as it rotates through the first'quarterof its revolution engages'saidthreads at a oint between them just'A ahead of their initial crossto a point forwardly of t ing. Inthe continui'edrotation of the bill through a half revolution, the tying bill twists the loop a (Figs. 6' 'and 7) and as the bill approaches and travels through the final quarter of its first complete revolution, it engages with the free end of the spool thread, cuts it oil' and' clamps the same in a well known manner, the end of the spool thread, in such movement of the bill, travel- ,ing with it. In the next quarter of a revolution of the tying bill, the arm Ds is moved outwardly, carrying the arm E with it. Consequently the loops a and b are stripped from the tying bill while the free end of the spool thread held by the bill cla-mp is drawn first around the crossed strands of the loop a and then through it, as clearly shown in Fig. 9. The end of the bobbin thread remains loose in the vshear device 14.- while the loops are thus being stripped from the tying bill (Fig. 8) and in the final outward movement of the arms E and D6 the free end of the bobbin thread is severed by the shear device. After the threads have thus been stri pcd from the bill, and the end of the bobbin thread drawn through the loop a, the bill continues to rotate through a quarter of a revolution in which the knot is drawn taut (Fig. 5) and the end of the thread held by the bill clamp finally released therefrom.

It will be observed that the thread guide 11 during the stripping operation (Fig. 8) occupies a position adjacent the hook E. The construction is such, however, that the guide allows the spool thread to slide freely therein in order not to place any tension thereon. Thus the knot is drawn taut solely by the tension laced by the tying bill upon the free end o the spool thread on the one hand and upon the portion of the bobbin thread leading to the bobbin, on the other hand.

In the reverse movement of the thumb fork, the parts are restored to their initial positions as shown in Fig. 3. I claim as my invention:

1. A weavers knetter comprising, in combination, a frame, a rotary tying bill mounted in said frame, an arm mounted on said frame and extending alon side the tying bill ie frame, the forward end of said arm being bent laterally in front of said tying bill, a member pivoted on said bent portion of the arm, a second member fixed to the arm with which the lirst member is adapted to coact to shear and clamp the thread, means for actuating the pivoted member, and other thread supporting means adapted to coact with said members to position and tension the threads in the o )eration thereon by said tying bill'.

2. weavers knetter comprising, in combination,'a frame and means mounted on said frame for tying a weavers knot including thread holding means and a rotary tying bill adapted to Aoperate upon a pair of threads supported by said holding means, said thread holding means including an arm carried by the frame and extending alongside the tying bill to a point in front of the tying bill, said arm being bent forwardly of the tying bill and having a pair of members thereon, one of which is mounted for pivotal movement relative to the other member, and means for operating the pivoted member.

3. A mechanism for tying weavers knots having, in combination .with la `tying bill, a thread clamping and stripping device mounted to swing laterally substantially in a plane containing the axis of the tying bill so as to be movable bodily toward and from the tying bill, the free end of said device having means for gripping the-threads so as to tighten the knot in the movement of the device away from the tying bill, and the end of the tying bill being disposed substantially in said plane during the stripping operation.

4. A mechanism for tying weavers knots having, in combination with a tying bill, a thread clamping and stripping device mounted to swing substantially in a plane containing the axis of the tying bill so as to be movable bodily toward and from the tying bill, the free end of said device having means for gripping one of the threads lightly and the other tightly and also for moving the lightly held thread relative to the other whereby to relieve the same of tension in the movement of the device away from the bill in the knot-tightening operation.

5. In a tying mechanism for weavers knots, the combination of a tying bill having thread cutting and clamping means and adapted to operate upon two strands crossed on opposite sides of the tying bill, means for holding the strands on each side of the tying bill spaced a substantial distance a art, mechanism for operating the tying bil in relation to said strands to produce interengaging loop formations therein to form the knot, and means for tightenin the knot and stripping it from the tying bill including the clamping means of the tying bill adapted to holdone of said strands as the knot is being stripped from the bill, and a device opera le to move one of said strands into closely spaced relation to Vthe other to relieve tension thereon while placing tension upon the other one of said strands in the stripping of the knot from the tying bill.

6. In a tying mechanism for weavers knots, the combination of a tying bill having thread cutting and clamping means and 4 i t 1,71e,a83

adapt ed to operate upon two stra-nds crossed on opposite sides of the tyingrv bi1l,fmechav uisin for operating the' tying bill in relation to said strands to produce interengaging .loop formations therein to form the knot, means for holding the strands a substantial distauceapart during the knot-forming operation including a device for gripping .both strands on one side of the tying hilf, said device being subsequently operable after the formation oi the knot tol move one of said strands toward the other to relieve it of `tension, andmeans for actuating said device to place tension on said other strand to tighten the knot.

'i'. A Weavers knetter comprising, in combination, a frame, a rotary tying bill mount'- Cd in said'fra-me and having thread cutting and clampingmeans, and means for posi.-

tioniug tvvolgstrandp: relativeito the tying bill so that the tying between the strands and thestrands are erossedon opposite sides ot the tying b1l1," sa`1d positioning means in- DAVID omvat.

have hereunto

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