US2057392A - Thread holder for looms - Google Patents

Description

-o v. PAYNE THREAD HOLDER Fon, LoQMs Filed oci. 29,l 19:54

oct. 13, 1936.`

2 Sheets-Sheet' 4 Oct. 13, 1936. 0, v PAYNE4 2,057,392.

' THRAD HOLDER FOR LOOMS u Filed oct. 29, 1954 4 2 sheets-sheet 2 Patented Oct. A 13, 1936 UNITED STATES PAT-ENT OFFICE THREAD HOLDER FOR LOGMS f Oscar V. Payne, Leicester, Mass., assignor to Crompton &` Knowles Loom Works, Worcester, Mass., a corporatlonA of Massachusetts Application October 29, 1934, Serial No.`750,404 ,2 claims. (cuasi- 257) This invention relates lto thread holders for weft replenishing looms and it is the general object of the invention to provide a device of this type so constructed as .to 'tension evenly any` one V of a number of threads, particularly coarse yarns.

Heretofore I have proposed a' thread holder havinga pair of fluted Arolls between which pass the weft ends extending froma reserve magazine. 'I'he rolls are ordinarily constructedso .as to tension the threads without causing unwinding 'at the bobbin, and keep them taut so that they will be above the path of the moving lay. As shown in my ReissuesPatent fNo.` 19,100 the `rolls are h caused to turn,bya force derived from a sus- 1-5 pended weightfwhichismovedLby loom vibration.

When adapting a thread holder of this general type for use with coarselyarns I have found that the rolls should :be comparatively large both as to diameter andxlength and I haveV also found that it is desirable to have a considerable length of thread between the Yrolls and 'theguide surface over which the threads pass when moving from the magazine. It is an important object of my present invention to provide means for mounting relatively -large rolls at a substantial distance from the guide surface preferably in such a way that this distance can if desired be varied to meet conditions arising from differently sized yarns.

Because of the size of the rolls I deem .it advisable to mount them on a support independent of the loom and not vibrating withsthe latter. Because of this fact the previously mentioned swinging weight cannot vbe used toadvantage, and kin its place I employ a pawl and ratchet feed .actuated by some moving part of the loom. As .shown herein the drive is derived from the lay preferably -by `connections from the rocker iron which supports the picker stick, although this particular relation is not essential.

When heavy yarnsare used there is a tendency in former thread holders for the threads to bunch together with resultant uneven tensions. It is a further object of my invention to provide a guide surface for the threads so curved as to effect a 45, distribution of thejthreads so they will tend to spread out to form substantially a single isheet of threads all `of which can be subjected to substantially the same tension.

With these and other objects in View which will. appear the description proceeds, my 'invention resides in the combination and arrangement of parts hereinafter described and 'setforth in the claims.

Inthe accompanying drawings, whereina convenient embodiment of my invention isset forth,

Fig. 1 is a front elevation of one end of theA loom showing my invention,

Fig. 2 is an enlarged front elevation of certain `parts of Fig. 1,

Fig. 3 is an end elevationtaken in` thedirection of arrow 3, Fig. 2, f

Fig. 4 is a plan View taken in the direction of arrow 4, Fig. 2,

Fig. 5 is a -detailed vertical section on line 5-5 of Fig. 4,

. Fig. 6 is a detailed plan view in the direction of Aarrow 6, Fig. l, and Fig. 7 is a diagrammatic view showing the relation between the threads from the reserve bobbins, the curved surfaces of the guide, and the rolls.

Referring particularly to Fig. 1, vthe loom frame I0 supports a lay II having swords one of which is shown at I2. A rocker shaft I3 supports the lay and has suitable bearings in the loom frame. Extendingfrorn the end of the shaft is a rocker iron I4 secured to the shaft I3 an-d rocking with thelatter and the lay. The bottom shaft I5, picking arm I6, picking shoe Il, sweep arm I8 and picker stick I9 may be of usual construction. 'I'he stick is preferably pivoted as at 20 to the rocker iron` I4 inthe usual manner.

The magazine M is attached to the loom frame andaccommodates a series of bobbins B from which extend weft ends W.

The loom may be of the usual multicolor weft replenishing type and will be equipped with a magazine M having reserve bobbins B with weft ends W, together with mechanism not shown for bringing about a transfer of one or another of the bobbins into the active shuttle. After a fresh bobbin is inserted into the depletedshuttle it will be picked to the opposite side of the loom and the shuttle eye threading operations require that the thread end of the freshly transferred bobbin shall be held sufficiently tight to cause the weft to be drawn down into the shuttle eye. Another reason for holding the weft ends taut results from the jarring and vibration incident to loom operation, `causing the bobbins to turn on their axes and unwind the weft ends until they fall low enough to be in the path of and become broken by the lay. 'I'he mechanism to be described hereinafter has as an important object the tightening or straightening of the weft ends ,so that they will be at all times taut enough for shuttle threading and above the lay,substantially as shown in Fig. l.

In carrying my invention into effect I provide a thread holder designated generally at T preferably supported Aindependently of `the loom and adjacent the magazine end thereof, as set forth in Fig. 1. The holder comprises a base 30 and an upright pipe 3| held therein by a screw 32. The top of the pipe has secured thereto a thread guide 33 which may be formed substantially as shown in Figs. 2 and 3 with a surface C that is convex in a plane substantially parallel to the lay as shown in Fig. 2 and concave with respect to a plane transverse of the lay. Vertical walls or cheek plates 34 may be secured to the sides of the holder to keep the threads from slipping olf the curved surface. The guide has a depending shank 35 through which extends a holding screw 36 and by means of which the guide is held to the top of the pipe.

The thread feeding mechanism comprises a casing 40 in which are mounted for rotation a pair of fluted rolls 4| and 42, respectively, each having vanes or teeth 43 so moving that each set of vanes intersects the path of movement of the other set to cause a thread lying between the two rolls to be deformed. Roll4l is secured to a stud 45 rotating in a xed bearing 46 of the casing, while the other roll rotates around a second stud 41 xed to the casing and the position of which is adjustable relatively to the axis of roll 4|. The particular mode of mounting the rolls may be substantially as set forth in my prior Patent No. 1,979,765 to which reference may be had for a more complete understanding of the mounting. Horizontal slot 52 in the casing permits the stud 41 to assume any one of a plurality of positions relatively to the other stud. The casing 40 may have an overhanging ledge 48 as set forth in the last named patent to keep the weft ends `from being caught betweeen the casing and the adjacent ends of the fluted rolls. The casing is held in vertically adjusted position on the pipe by means of a set screw 49.

In order to impart motion to the rolls I secure to stud 45 a ratchet wheel 60 and arrange the same in the path of a vertically reciprocating pawl rod 6|. The latter has a pointed head 62 to coact with the-teeth of the ratchet wheel and a light spring 63 interposed between the rod and a fixed part of the casing holds the head 62 against the ratchet. y f

In order to reciprocate the rod 6| I provide an oscillatable rod 65 shown particularly in Figs. l and 6 having on the inner end thereof a head 66 which is held to the rocker iron I4 by screws 61. The rod extends outwardly and may be offset as at 68 so that the outer end 69 thereof is substantially in alignment with the axis of shaft I3. The base 30 has a web 10 through which the end 69 of the rod passes so that it will be guided and held against undue vibration. I find that it is not necessary to provide a close running fit between the rod and the web 1U.

A rocking arm 15 is held in angular adjustment on the rod by means of a set screw 16 and has the outer endthereof slotted as at 11 to receive a stud 18 locatable at various distances from the shaft end 69. The lower end of the pawl rod 6| is pivotally supported on the stud 18.

During normal loom operation the shaft I3 will rock back and forth in its bearings and will cause an loscillation of the rocker iron |4. This in turn causes movement of the rod 65 and causes the outer end 69 thereof to have an oscillating movement similar to that of the rocker shaft. The arm 15 is therefore raised and lowered altermately, moving up as set forth herein when the lay moves forwardly, although I do not deem this an essential relation. When the arm 15 rises the head 62 of the rod 6| will give the ratchet wheel and therefore fluted roll 4| a partial rotation in a counter-clockwise direction as viewed in Fig. 3. By means of a force transmitted through the yarns the other fluted roll will be caused to rotate in the opposite direction, thereby causing a deformation in the yarns which tensions and holds them taut. As the lay moves backwardly the pawl will have an idle or non-working down stroke and will slide over the ratchet without causing retrograde movement thereof.

Another feature of the invention relates to the spreading of the several weft ends into sheet form so that the tension on the threads might be uniform. This result I accomplish by providing the guide with a surface having a compound curve as already described. I nd in practice that the weft ends which are drawn from the magazine distribute themselves over the curved surface C without objectionable overlapping and that afterleaving this surface they spread out somewhat fan-shaped as they approach the rolls 4| and 42.

The behaviour of the threads is similar to that shown in Fig. 7, where the vertical lines and 8| ,representy two slots in the magazine from which the weft ends issue. The threads from each slot extend down in a sheet as shown, the upper threads tending to move toward the center of the curve C, and the lower threads toward the outer edges thereof. After leaving the curved surface C the threads spread out as shown in the lower part of Fig. '1, and avoid bunching or crowding. In this way the several threads are subjected to more or less the same tension and the feed of the pawl and spacing of the rolls can be set to give a minimum but suiicient drawing action on the weft ends to keep them above the lay and cause proper threading of the shuttle eye.

In Fig. '1 the areas covered by shade lines represent the sheets of weft threads or ends and the lines extending across these areas are for the purpose of indicating the twist in the sheets as they passtoward and beyond the guide surface.

yFrom' the .foregoing it will be seen that I have provided a form of thread holder adaptable for the use of coarse yarns and so constructed that the threads spread out in a sheet of more or less uniform thickness to prevent lapping or crowding. By using an independent mounting for the thread guide and rolls I am able to make these devices in large enough proportions to accommodate the coarser threads for which they are more particularly designed. While the thread guide and rolls are mounted on a support independent of the loom yet I do not vwish necessarily to be limited to this mode of support. It will also be seen that the thread guide and rolls are so mounted that relative adjustment of the distance between them can be effected and also each of these devices is angularly movable about the pipe 3|. The result of this relation permits a change in the direction of delivering the threads from the guide toward the rolls. Furthermore, I have provided a simple means for actuating the rollsl by a connection of the rocker iron of the lay. The control of the threads is considerably facilitated by having the guide surface curved in such a way that it is concave in a cross section transverse of the weft ends and convex in a cross section parallel to the weft ends.

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the in- Vvention and I do not wish to be limited to the details herein disclosed, but what I claim is:

l. In a weft replenishing loom, a magazine from which extend weft ends in two spaced sheets, a pair of rotatable tensioning rolls having teeth moving in paths which intersect along a line below the magazine and pointed in the general direction of the magazine, and a thread guide located between the magazinevand rolls to produce a bend in the weft ends, said guide having an upwardly facing curved thread engaging surface convex with respect to the line along which the weft ends lie and concave upwardly in a direction transverse to the line along which the weft ends lie, the weft ends of one sheet extending along the adjacent part of the concave surface and the weft ends of the other sheet extending along another part of the concave surface adjacent to said other sheet, the weft ends passing down uninterruptedly from the guide surface to the rolls and being spread out along said line of the intersecting paths.

2. In a weft replenishing loom, a magazine to hold a pair of stacks of reserve bobbins, the weft ends of the stacks leading from the magazine in spaced sheets, a pair of rotatable weft tensioning rolls having teeth which travel in paths that intersect along a line substantially parallel to the axes of the bobbins in the magazine, and a weft end guide interposed between the magazine and rolls, said guide having a weft end engaging surface which is concave upwardly along a section taken transverse of the line along which the said paths intersect and said surface being convex along a section substantially parallel to the line along which the said paths intersect, the central part of the guide surface measured transversely of the weft ends being lower than the outer parts thereof, the weft ends passing down uninterruptedly'from the engaging surface tc the rolls, the weft ends from each stack of bobbins being spread out over that part of the engaging surface on the side of the said central part adjacent the stack, and the weft ends extending in a sheet toward said line along which the said paths intersect.

OSCAR V. PAYNE.

Images