US2358752A - Wound package of yarn and method and mechanism for producing the same - Google Patents

Description

2 l 7 M 9 e 8 h 5 4 d w 23 e M m A H S C 5 E M D N A DE 0M HA T5 E 1 ME E H 1 flm m D m w AC Nw GRO AR YP FR 0 F Sept. 19, 1944.

WOUND PACKAGES 0 Filed June INVENTOR I |lllllllllllllllllllfilllllllll GEORGE WHITE by 2:3 afforrzeys Sept. 19, 1944. 5. w rr 2,358,752

' WOUND PACKAGES 0F YARN AND IN METHOD AND MECHANISM SAME Filed June 27, 1941 3 Sheets-Sheet 2 FOR PRODUCING THE INVENTOR ATTORNEY Sept.'19, 1944.

G WH E 2,358,752

lT WQUND PACKAGES OF YARN AND IN METHOD AND MECHANISM I T513. Tafil FOR PRODUCING THE SAME Filed June 27, 1941 5 Sheets-Shae; 3

INVENTOR I GEORGE l V/m'z" ATTORNEY speed towards its upper limit.

- parallel wound, 1' less end vary in respect of both pitch and traverse i'rom layers of a steep pitch winding toward Patented Sept. 19, 1944 OD AND MECHANI 1 rrnn SAME George White, Nuneaton,

Courtaulds Limited, London,

' ish company Application Junev 27, 1941,

YARN AND mn'rn- SM non. raonncmc England, asslgnor to England, a Brit- Serial No. 400,086

In Great Britain. September 20, 1940 I i2 Claims. goi. 242-43) This invention relates to wound packages oi yarn on single-flange bobbins and to a method and mechanism for producing such packages, and one of its objects is to produce a package or yarn wound. on a single flange bobbin such that the yarn can be readilyunwound over the flangeless end of the bobbin and also has little tendency to slough off the bobbin.

-It is already known, when producing a package of yarn, to reciprocate the yarn guide over -lever L. The top a uniformly long traverse while increasing the According to the present invention, a package of yarn comprising 'a single-flanged bobbin and yarn wound thereon is produced in which the layers near the flanged end are of slight pitch winding, or as it is frequently expressed, while the layers near the flange,-

the flangeless end of the bobbin to layers of a lesser pitch winding terminating at an appreciable distance from the flangeless'end.

Mechanism by which it is possible to obtain'a package with the layers arranged as above described is illustrated in the accompanying draw-f ings, in which Figure l is an elevation of trav-,

stud G on the end of the connecting rod F. The

other end of the connecting rod F passes through two adjusting brackets which are bolted to the bar I-I. At the other end of the bar H is a stud N of the lever L is connected through the stud P to'the rod Q, which in its turn is connected machine. On the traverse rod Y are mounted the thread. guides Z and the thread A1 runs over the guide Z to the bobbin Bi. At the bottom of the lever L is an adjustable bracket ,R carrying the cam roller S. A spring K is provided attached at one end to a point in the lever L adjacent to the stud P and at the other end a bracket J at the other 'end of the bar H. The

erse mechanism; Fig. 1A is a detail view in ele- 'vation oivportion oi the operating mechanism shown in Fig. 1; Figure 2 illustrates in cross-section a bobbin which has been wound with the help or such mechanism.

Figure 3 corresponds to the traverse l of Fi ure 2 iswhich only the slow traverse isactuating the thread guide.

Figure 8A correspondsto the-traverse I of Figure 2 and shows a slow traverse over part-or the bobbin and an accelerated traverse'over a lurther part.

Figure 38 corresponds to the traverse lb of Figure 2 andconsists or a small portion at a slow traverse and the remainder at an accelerated traverse and then the reverse process occurs.

Fig. 4 is a sectional view drawn to a'larger gzlel, oi the operating cam shown at the left in In Figure 1. A represents the main operatin cam on which rests the roller ,0 attached to the pri ht lever B which is iulcrumed at a. The

" roller 0 is kept in contact with the cm A by means or the spring D secured to the lever D and to the frame (not shown). The lever D is provided with a long slot by which the, length of the traverse can be adjusted, and in this slot said bar H also is provided with an adjusting bracket M against which the spring K tends to hold the lever L. A heart-shaped cam T is provided so that the roller S at the lower end of the lever L tends, on each reciprocatory movement of the mechanism caused by the rotation of the cam A to come into contact with the heart cam T. and the relative positions of the roller 8 and the cam'T are so adjusted that at the end-oi the stroke of the bar H the roller S just comes into contact with the portion 01 the cam nearest'to its centre of rotation. The cam '1' is caused to rotate slowly by means of a pawl W acting on the ratchet wheel U secured to the cam T.- This pawl W is mounted on an upright I lever V, provided with a movable finger El pivtoted on the stud Fl at the upper end of the lever V. The movable finger El has its lower end held against-the stud Gl by the spring Hl one end of this spring being attached to the lower end 01 the finger El and the other to the lever V.

Mounted on the rod Q is a bracket Jl which will also carry a rod Kl which is adjustable in a vertical direction and fastened to the bracket Jl *by a screw. At the lower end-oi the rod Kl is mounted a hardenedsteel roller Ll which is ire'etorevolve. l I j v In the operation or the machine, the roller Ll when moving rrom right to leit, cpmes .up against the highest point of the finger El and moves the finger El, thelever Vand the pawl W along to the. left to a predetermined extent, until the angle of the lever V is such that the roller Ll .passes over the top of the fin er El. The lever V is then brought'backto its original position by a is carried and ilxed at any selected position the ,which is designed to e se in the ratchet .wheel on which swings a second upright cam to the traverse rod Y running the full length of the to a suitable hook attached to U when the pawl is moved to the left, but disengages when moving'to the right.

When the roller Ll moves from left to right,

it strikes the sloping surface of the top of the finger El, and El is depressed around its fulcrum Fl until the roller Ll has passed over, then the finger El, under the influence oi the spring Hi, resumes its position. x

The specific construction for operating the lever V, as shown in Il ig. 1A, forms no part of the invention and ismerely illustrative of the manner in which the ratchet maybe moved by the traverse bar. The ratchet wheel U can suitably be rotated one whole revolution while the cam wheel A is rotated 60 times. When the roller 8 strikes-any other part of the cam T than that part which is nearest to the axis, the upper part of the lever L is given a further movement to the right, such movement being controlled by the spring K. It is thus obvious that at such times, the rod Q, which is directly attached to the traverse mechanism is given an extra movement,

in addition to that caused by the cam A, and the I traverse guide through which the yarn runs on the bobbin is given an accelerated speed.

In Figure 2, which illustrates in cross-section a bobbin wound with yarn, a line diagram is shown illustrating the build of the yarn on the bobbin. In this diagram, a continuous line is used to denote a slow traverse speed resulting from the action of the cam A only. n the lever L has not been given any additional motion by means of the cam T: A dotted line is used to denote an accelerated traverse speed resulting from the combined actions of the two cams A and T. For the sake of convenience, the line diagram has been drawn on the assumption that the cam A executes only 20 revolutions while the cam T revolves once. The cam A is driven at a constant speed through gearing from the bobbin pulley shaft, and whelrthe cam' T is in the position shown in Figure 1, only a slow traverse of length d+b is imparted to the traverse-guide, this first traverse being represented in length and speed by the top line marked I. At each complete oscillation of the traverse-guide, the cam T is turned through a small angle by means of the pawl W, so that commencing from the position shown in Figure 1, the roller 8 will at each successive traverse meet the cam .T a little sooner until after ten traverses, the peak of the cam T is 'reached. From this point onwards the reverse procedure takes place and the cam T meets the roller 5 later and later until the cam T- is again at the position shown in Assumlns' that the cam A rotates with constant speed and ignoring any slight alteration in its position which may be imparted to it as hereinafter described, the fulcrum-stud N and the part of the lever L immediately adjacent to it will move left and right at a constant speed and over a constant distance. With the cam T in the position shown in Figure 1, the roller .Sonly Just reaches the cam T when the roller C reaches the peak of cam A. As cam T is turned, the roller S meets it at an earlier point and the lever L is swung about its fulcrum N through an increasing distance and the traverse is thereby lengthenedumtil the cam T has. rotated through 180'. While the traverse is under'the additional control of the cam T, the speed of the traverse is. when using the apparatus more particularly illustrated in Figure 1, approximately doubled.

In the line diagram, the linesmarked from 2 i0 respectively represent the traverse of the sec-' ascents end to the tenth traverses. Taking for example line 2 as representing the traverse when the cam T has been turned a small amount, the roller 8 comes into contact with the cam T when nearing the end of the traverse, so that the last small portion is lengthened and is faster. As the cam T continues its rotation, this last portion is gradually increased until the peak of T is facing S: then the line "I would represent the traverse and 8 would only have moved a small amount a to the right before coming into contact with cated bodily along its axis by a small amount, it

is generally preferred to employ the well known device, known as a plate-cam, shown at B, for causing such reciprocation through a distance of say one tenth of an inch; such reciprocation may conveniently take place once in 18 or 20 revolutions of the cam.

This device is illustrated in Figure 4, in which the cam A is carried by a wheel Ml. provided .on its circumference with cogs N I and, rotating freely on the extended axle OI of a second wheel Pl provided on its circumference with cogs Ql. The face of the wheel PI is provided with an undulating cam B against which rests the cam follower RI. The cogs-NI of wheel MI and Qi of wheel Pl both engage a freely running cog. wheel SI. Wheel'Pl is keyed to, and driven by,

a shaft Tl and permits motion through the cog wheel SI to the wheel Ml. on wheel MI is not the same as the number of cogs on wheel Pl, but may conveniently be one more 'or one less, so that wheel Ml will rotate at a slightly different speed from wheel PI and consequently the cam follower RI will move slowly along the cam B and wheel MI, and together with cam A will have a small and slow' movement alternately towards and away from thefised wheel Pl.

In carrying out the present invention, it is preferred to employ a bobbin which has a slight lip at the flangeless end, and of which the diameter of the core at the flangeless end is somewhat greater than that at the flanged end.

WhatIclaimisi v 1. Traverse mechanism for use in winding yarn on to a single-flanged bobbin comprising a thread guide arm, a main cam, an auxiliary cam and*means actuated by the main cam'to give a slow traverse speed and by the main cam and an auxiliary cam to give an accelerated traverse speed, said actuating means including means for rotating the auxiliary cam. at a fraction of the speed of the main cam and thereby causing the additional traverse speed to increw to a maximum and fall to a minimum alternately so that the layers of yarn near the flanged end of the bobbin are substantially parallel wound and the 7 layers of yarn near the flangeless end of the bob- 11):). a are of a comparatively steep pitch wind- 2: 7 verse mechanism for use with a traverse bar in winding yarn on to a single-flange bobbin,

comprising a cam motion, a cam surface, and

means causing slowly advancing and receding of said surface, a rod reciprocated'by said cam mm The numbenof cogsroller on I. Traverse mechanism as claimed in claim 3.

tion in the direction of its length, a second rod pivoted in a direction more or less perpendicular to the first rod, one end of the said second rod being connected to the traverse bar, while the other end is adapted to advance toward and recede from said surface so that when the said other end of the second rod meets the said surface, the end of the second rod, which is attached to the traverse bar, is given an additional motion to that which is imparted to it by the reciprocating first bar.

3. Traverse mechanism for winding yarn on to a single-flange bobbin,comprising a lever, a main cam adapted to reciprocate said lever, a bar, a connecting rod adiustably secured at one end to the lever and at the other end to said bar, a second lever pivoted intermediate its ends to the said bar and normally held in fixed relation thereto by a spring, an auxiliary cam mounted relative to one end or the said second lever means for driving the said auxiliary cam to contact a said end once during each reciprocation of .the said first lever whereby the said sec- 0nd lever is moved relatively to the said bar by anamount varying from zero to a maximum, a rod secured to the other end of the said second lever, a traverse rod secured to said rod. and a number of thread guides secured to the said traverse rod. I

4. Traverse mechanism as claimed in claim 3, wherein the main cam is adapted to be reciprocated bodily during its rotation.

5. Traverse mechanism as claimed in claim 3, wherein the first mentioned lever is pivoted at one end and the connecting rod has a stud at one end secured in a predetermined position in a slot in the said first mentioned lever.

6. Traverse mechanism as claimed in claim 3, wherein the secondlever has a slot intermediate its ends for the reception of a stud on the end or the bar, and'means for securing the said stud at any desired point in the said slot.

v ing in respect or wherein the auxiliary cam is heart-shaped.

8. Traverse mechanism as claimed in claim 3, wherein the auxiliary cam is wheel adapted to be turned by a pawl at less than that of the main cam,

9. Traverse mechanism as claimed in claim 3, in combination with a spring and an adjustable bracket on-the bar wherein the second lever is normally held by the action of said spring against said bracket.

10. A package of yarn comprising ,a singleflange bobbin and yarn wound thereon, the layers near the flanged end being of slight pitch windins. and the layers near pitch and traverse from layers of a steep pitch winding toward said fiangeless end 01* the bobbin to layers of a lesser pitch winding at some distance from the flangeless end.

11. A wound package or yarn on a singleflanged bobbin in which the layers of yarn near the flanged end of the bobbin are substantially parallel wound and the layers of yarn near the flangeless end of the bobbin vary in respect of both pitch and vtraverse from layers of a steep pitch winding approaching the flangeless end of the bobbin to layers of a lesser pitch winding terminating at an appreciable distance from the flangless end.

12. Traverse mechanism for winding yarn on a speed s to a single flange bobbin comprising a thread guide, means for operating said thread guide for winding the layers near the flanged end with slight pitch and means for varying the operation oi said thread guide operating means ior winding the layers respect of pitch and traverse from layers or a steep pitch winding toward 'said flangeless end of the bobbin, to layers oi a lesser pitch winding at some distance -irom said flangeless end,

' GEORGE WHITE;

secured to a ratchet the flangeless end varynear the flan'geless end varying in

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