US2263982A - Picker stick check for looms - Google Patents

Description

Nov. 25, 1941. H. A. DAVIS 2,263,982 PICKER STICK CHECK F OR LOOMS Filed Aug. 22, 1940 INVENTOR HARRY A. DAVI5 ATTORNEY Patented Nov. 25, 1941 UNITED STATES PATENT OFFICE PICKER STICK CHECK FOR LOOMS Harry A. Davis, Hopedale, Mass., assignor to Crompton & Knowles Loom Works, Worcester, Mass, a corporation of Massachusetts Application August 22, 1940, Serial No. 353,711

Claims.

This invention relates to improvements in picker stick checks for looms and it is the general object of the invention to utilize motion of the picker stick induced by the shuttle to check or resist motion of the stick and thereby retard the shuttle. In the usual loom the greater part of shuttle momentum is absorbed by frictional contact with the binder but there is usually a residual amount of momentum which remains to be absorbed during the last part of the shuttle boxing. In many looms this residual momentum is absorbed by the picker with harmful results to itself. The picker is usually connected in some way to the picker stick so that motion of the picker in an outward direction toward the end of the lay will be transmitted to the picker stick. It is an im portant object of my present invention to provide means whereby the time during which the picker is in contact with and absorbing the residual energy of the moving shuttle can be distributed over a suflicient period to reduce wear and strain on the picker.

It has been customary in the past to employ a type of picker stick check including a strap the motion of which is resisted by a spring or some form of yielding friction clamp. It is another object of my present invention to provide a flexible strap which will be moved by the picker stick during the latter part of shuttle boxing and in its motion act to cause other means-to increase the frictional resistance between the picker stick and the strap.

It is a more specific object of my present invention to provide a strap having one end thereof anchored to the lay and extending around the outer edge of the picker stick and then inwardly toward a rotatable element to which it is attached. When the stick is moved outwardly the strap will act to turn the rotatable element and the latter will rotate a cam or the like to move one end of a lever into a position to resist motion of the picker stick. The lever may if desired act on the strap to force it against the stick.

It is a still further object of my present invention to provide resilient means for returning the strap and lever to normal position in such a way as to locate the picker stick a short distance inside its extreme outer position. In this way assurance is given that the stick will be in an initial checking position and able to receive motion from the latter part of the shuttle flight and communicate this motion through the strap to the checking lever.

'-Another object of my invention is to make the lever in two partswhich are yieldingly held together, one of the parts to derive its motion from a cam and the other part to move to a position where it can resist picker stick motion. The yielding connection will permit the second part of the lever to be arrested in its motion should the cam act to give the lever too large an angular motion.

With these and other objects in view which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth.

In the accompanying drawing, wherein-a convenient embodiment of my invention is set forth, Fig. 1 is a rear elevation of one end of a having my invention applied thereto,

Fig. 2 is an enlarged horizontal section on line 2-2 of Fig. 1,

Fig. 3 is an enlarged rear elevation of part of the mechanism shown in Fig. l and looking in the direction of arrow 3, Fig. 2,

Fig. 4 is a vertical section on line 44 of Fig. 2,

Figs. 5, 6 and 7 are detail horizontal sections on lines 5-5, 6-6 and 1-1, respectively, of Fig. 4,

Fig. 8 is a horizontal section on line 8-8 of Fig. 3, and

Figs. 9 and 10 are vertical sections on lines 9-9 and Ill-I0, respectively, of Fig. 2.

Referring to the drawing, I have shown part of the loom frame I0 and a lay ll having a shuttle box B at one end thereof to receive a shuttle S. The lay supports a picker spindle l2 along which slides a picker l3 propelled by a picker stick [4 pivotally mounted at [5 on a rocker iron or foot l6 extending from the lay axis or rocker shaft I1. The lay is supported by swords one of which is indicated at [8 supported on the shaft l1. outer edge of the picker stick and is connected by a sweep stick 20 to a picking arm 2| mounted on a picking shaft 22 on which is also mounted a picking cam 23. The bottomshaft 24 of the loom carries a picker ball arm 25 on which is mounted a picking ball 26 to cooperate with the cam 23 and rock the shaft 22 in a clockwise direction A lug strap I9 extends around the.

side of the 100m it will enter the box B and will be retarded by the usual binder not shown but well understood. During the boxing of the shuttle a frictional force is applied to the shuttle, but this force ordinarily is not suflicient to bring the shuttle to rest before it strikes the picker. The residual momentum remaining in the shuttle as the latter approaches the end of its boxing movement is exerted against the picker and from the latter to the picker stick, tending to move the latter outwardly or in a left hand direction as viewed in Fig. 1 toward the adjacent end of the lay. After picking the stick will move outwardly or to the left as viewed in Fig. 1 but will be prevented from completing its outward motion by a mechanism to be describedi Under'porrnalrunning conditions therefore it will be understood that as the shuttle enters the box the picker stick is in its initial checking position a short distance from its extreme outward or final checkns osi io f om tee to tw in e d pendin the ettin et-th a s t e d s ribe e e na t d a the h ttle n a t e e of its stroke the-stick will be given an pul ward me men l pa ts a ready describ d o thems lves f rm 1. ar Of my 1 11 ill $8130 nd may be made and operated as usual with the exception efth mea s e hold n th pic e sti kin its ni a h ck n 'pqsit en,

11 carr in my p esent in ention into efie I ro ide mechani m which com rises t o eeoperating parts one of which is given a direct m i b the icke st k as th sh tt e nea s the n o ts t e hd the se ond of wh c is m ed by he first i e pos tion to r sist ou a d motion Of he stic i firs des rib at part of the m ch n sm which s d b the p cke stick and then describe the second partwhich is aet-uatedhy th fi s part o ehee t e sti k.

The lay ha secu ed thereto a dependin bracket 21 e ower e d. e w i h is. te med with a eet 28 t whiehe herizeh e a m-231s be t Extehdi e up ardl emthe are: -29 is a p v pin 9 which is heldi fixed n ie in the arm by a nut 3|. Rotatable on this stud 35 is a,cy,1- in-, e f ee s e 3 t ow p rt of wh c has a t bular bearing 33 turnable on the stud. 'Ifhe lat: t s P de i h. e he lde z t en a e t e arm 23 and a cgliet 35 located slightly above the headset? o Pe m t he lat e to etate free n th tud-.- The shell 3. ha outer e line e u a e which i his instance s pre era ly, though not necessarily, concentric with the axis of the studflfl. A flexible strap 31 has'its rear end secured as at 38 to the cylindrical surface 36 and after being -wrapped around a portion of the latter extends outwardly "or to the left as viewed in Figs. 1 and 2 behind the picker stick and around the outer edge thereof. The front end of the strap thenextends inwardly toward the cen o h la o e. at ched t the l t y a er'39. In this Way the forward end of the strap 3'! is held fixed with respect to the lay while the rear end of the strap is'fastened to. andcan cause rotation of the shell 32.

The bearing 33 has secured thereto a cam disk '45 held in adjusted position with respect to the bearing by a set screw 46. The cam may .6011- veniently be in the form of. an eccentric; as suggested'in- Fig. 8, but I .do. not .wish tobe'limited rotatable about the stud 30 I provide a stop collar 50 having a stop finger 5| to engage the arm 29 as at 52, see Fig. 7. The stop collar is held in angularly adjusted position on the bearing 33 by a set screw 53 and the finger 5i is held against its stop by means of a torsion spring 55 surrounding the upper extension of stud 39 above the collet 35. The lower end of the spring is held by the stud as at 55 while the upper end extends into the shell 32, as at 51. A disk '58 is held to the stud by a screw 59 and prevents displacement of the spring but does not interfere with rotation of shell 3-2. The spring is attached to a head 55 which rotates with the shell 32. The spring permits turning of the shell 32 in a clockwise {direction as viewed in Figs. 6, 7 and 8, and acts to return the shell and stop to normal position, and also draws the rear end of the strap inwardly, or tgward the center of the loom.

The second part of the structure is controlled :by arn 4 and ih hd s a sec nd ertiea stud. n a m on whi h is r t te ei y of m mbe s the of wh ch is le e t! an the oth a ei he s i k h elsi-hs arm =62, The e er has an arm .53 positioned forengagement with the cam disk 45 and has a second arm fig extendins o ar t e end e h a A ed- 65 i s h mohn 'in n 56 threa ed n a m 4 and held in position by nut 61. An adjusting collar 68 secured to the rear end .of rod .65 by screw 69 limits forward metion of the rod relatiyelyto nut 66.

The forward end of rod 55 extend into a shoe 10 formed on the checking arm-g2 and is ens larged as at H to limit rearward movementpf the rod with respect to the shoe, see Figs. 2 and 0- A mp e on sp n su ee ds' ed t5 and lies between the nut 56 and theshoe 1g and tends normally to hold the latter in forward spaced position with respect to the arm .541 The shoe Ii! has an arcuate smooth vertical web -15 which lies behind and contaet withthatpart of the strap 31 which extends between the shell 32 and the picker stick. Except as-restrained 9y relations i s to e men i n d ere t the lever 6| and'arm .62 are freeto rotate onthe stud 60.

U de no m hdx eh w n th s ttle t ave lins wer he Dex h arts wi he. in the fu l line position sh wn in Fig. 2 With-the pi k s kits in t l eh eki s pit-sees by s n 1 a d ead t start outwa dly with the shuttle during the last part of thefshuttle travel in the box. Under these conditions the shoe 1. wi e h li h eeete t With-the rear e t of stra 3 nd th a 3. et. leve 5' l en a e the low su ace 4. of se s 4 as the shuttle ke t e eith he ielee t e willstert to o e to tne lef om the ull ihere tien cf Fi 2. and. i de -hs s w ll m e the rear-pes .e strapto t e "left, e toward th ediee end. f th la due e the ee ha h ro n o the strap is fix d he l Me exnen e the st p wi l cau e otat on Qt the. she l 3 ee cent 45 i s d i n to there the. wide pe t 4. o t rn reerwerdlyy h reby m iesthe a m ti e au in a l c w se-whites le e t as ie ed in F g. 2. Th e rresPe des. tor-W rd met enof arm .64 moves the shoe [0 forwardly by a force: transmitted through spring 1.5. I

.-'he s ra 31 i pu hed te w-e d yagainst the rear sid o t est ek when t e. sh set-ten o i a e the r c na r s stan e. etie e hy. the strap to motion of the stiek, 15y the he nielser t c has reeehed it et ermest ces tion as indicated in dotted lines in Fig. 2, the cam will have moved sufiiciently to place the wide or high area 48 against the end 63 of the lever and the shoe will have. moved to its extreme forward position shown in dotted lines in Fig. 2,

thereby increasing the wrap of the strap around the web 16.

The movement of lever 6| is due to a force derived originally from the shuttle and transmitted tothe picker stick to cause the latter to move the rear part of the strap in an outward or left hand direction as viewed in Fig. 2. For this reason the checking force exerted on the stick is conditional upon the time of arrival of the shuttle in the shuttle box, and the rapidity with which the cam is turned to rock the lever, and therefore the rate at which the restraining force is applied by shoe H1, is proportional to the rate of travel of the shuttle. While spring 15 permits slight relative motion between the arm and the lever, in actual operation arm 62 and the lever 6| move together and therefore can be considered for all practical purposes as a unit rotatable about the stud 60. The spring 15 will yield if the cam rocks lever B! through a distance more than that which can be accommodated by the flexing of the strap 31. The web 16 has been illustrated as having direct contact with the rear part of the strap 31, a construction which avoids direct engagement between the shoe and the picker stick, but I do not wish to be limited to this construction since the significant feature of the arm 62 is that it exerts a resisting force on the picker stick which is additional to the resistance offered by the strap 31 acting alone.

From the foregoing it will be seen that I have provided a picker stick check wherein outward motion of the stick acts to increase the frictional resistance offered to motion of the stick by a resisting element, such as the strap. It will further be seen that the picker stick causes motion of a part of the strap and that this motion is utilized to force the strap against the picker stick. More specifically, it will be seen that movement of the strap induced by the picker stick causes rotation of a cam element which acts on a lever to force the strap against the stick. Although I have shown the strap as having one end fixed with respect to the lay I do not wish necessarily to be limited to this construction, as it is sufiicient if one part of the strap can be caused to move by the stick to actuate the lever rocking means.

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

1. In a picker stick check for a loom having a lay and a shuttle box thereon to receive a shuttle and having a picker stick to be given a movement toward the adjacent end of the lay by the shuttle as the latter approaches the end of its travel in the shuttle box, a flexible strap having one end thereof secured to the lay on one side of the picker stick and having the other end extending around the stick to be moved by the stick when the latter has said movement, a rotatable element mounted on the lay to which the strap is connected, a cam on the rotatable element, and a lever pivoted to the lay and having one end to be moved by the cam and having the other end positioned in engagement with the strap, move- 'ment of the strap by said movement of the picker stick turning the rotatable member and causing thecam to rock said lever' and cause said other end of the lever to move the'strap into position to resist movement of the picker stick.

2. In a picker stick check for a loom having a lay and a shuttle box thereon to receive a shuttle and having a picker stick to be given a movement toward the adjacent end of the lay by the shuttle as the latter approaches the end of its travel in the shuttle box, a flexible strap supported by the lay and extending around the picker stick and having one end thereof moved by the stick when the latter has said movement, a cam connected to said one end of the strap to be moved by the latter, and a lever having one end thereof to engage the cam and the other end to move the strap toward the picker stick, movement of said one end of the strap causing movement of the cam and the latter rocking the lever in a direction to move said other end of the lever against the strap to move the latter frictionally against the stick to retard movement thereof.

3. In a picker stick check for a loom having a lay and a shuttle box thereon to receive a shuttle and having a picker stick to be given a movement toward the adjacent end of the lay ,by the shuttle as the latter approaches the end of its travel in the shuttle box, a flexible strap engaging the picker stick and having one end thereof movable by the stick when the latter has said movement, a lever pivoted on the lay, and means operated by the strap to move one end of the lever and thereby rock the lever when said end of the strap is moved by the picker stick, the other end of the lever engaging the strap and forcing the latter against the picker stick to retard motion of the stick toward the end of the lay when said lever is rocked by said means.

4. In a picker stick check for a loom having a lay and a shuttle box thereon to receive a shuttle and having a picker stick to be given a movement toward the adjacent end of the lay by the shuttle as the latter approaches the end of its travel in the shuttle box, a strap extending around the outer edge of the picker stick and. having one end to be moved by the picker stick when the latter has said movement, a picker stick checking lever, and means operated by said strap to cause said lever to rock when said end of the strap is moved by the picker stick, said lever having a part thereof movable to a position to force the strap against the picker stick to assist in resisting motion of the picker stick toward the adjacent end of the lay when said lever rocks.

5. In a picker stick check for a loom having a lay and a shuttle box thereon to receive a shuttle and having a picker stick to be given a movement toward the adjacent end of the lay by the shuttle as the latter approaches the end of its travel in the shuttle box, means movable by the picker stick and acting to resist said movement of the picker stick toward the adjacent end of the lay, and other means moved by the first means against the latter to force said first means against the picker stick to increase the resistance offered by said first means to movement of the picker stick toward the adjacent end of the lay when said first means is moved by the picker stick.

6. In a picker stick check for a loom having a lay and a shuttle box thereon to receive a shuttle and having a picker stick to be given a movement toward the end of the lay by the shuttle as the latter approaches the end of its travel in the shuttle box, a strap extending around one edge of the picker stickandhaving an enmhere 'o't niova'blebythe picker stick when the latter has said movement; a picker stick checking lever normally in non-checking position, and means actuated "by the strap w'heir the latter is moved b'y'th'e picker'stick to move the rev-er against the strap and force the 'latter againstthe'picker stick.

7. 'In'a picker stick check for a 100m having a lay and a shuttle box thereon to receive ashnttl'e'arid having a picker stick to begiven'a move "merit toward theehd' ofithe lay by the shuttle as the latter approaches the end of its travel in theflshuttlebox, the combination of two picker sticlt'checki'rig'm'eans one" of "which is normally in non=checking position an'd theother of which is normal-1y in checking position and is moved by the picker stick when the latter has said movement, and mechanism actuated by said other mea ziswhen' the latter is moved by saidjpick'er stick to move the first named means against the other means to force thelatter against thepick'er stick.

8-} in a picker stick check for a loom having a lay and ashuttle box thereon to receive a shirtt-le and having apicker stick to be given a moveinent toward the end of the lay by the shuttle as the latter approaches the end of its travel in the shuttle box, a flexible strap to be engaged by the picker stick and have one end thereof move when the picker stick has said movement, a rock able lever, means to rock'said lever when the strap is moved by said picker stick, a picker stick checking arm, and a yielding connection between said lever and the arm, rocking of the lever ca'using the arm to move toward picker stick checking positionby a force derived from the lever and transmitted through the yielding means.

9. In a picker stick check for a loom having a 'stra'p' is moved by the picker stick, ashuttle checking'a'rma bolt connecting the lever and the arm, a compre'ssion sprin'g surrounding the bolt and tending normally to inove' the arm in a direction from the lever to the stick, and stop means to limit motionof the armwith respect to the-lever; rocking of the lever 'by said strap and means moving the arm to pi'cker stick checking-pos'itioiran'd the'arm being movablerelatively to" the lever whenin p'idkerstick checking positib'riby reason of compression of the spring.

l0. In apicker stick check fora l oom havi'ng a lay and af shuttle box thereon to receive a shuttle andhivihg a pieke'rstick' to be givena 'mcyemem toward the adjacent end of the Pay by the' shu'ttle thelatter approaches the end (if its travel into the shuttle box, two meanseach capable of resisting-movement ofthe picker stick, one of said meansbeing flexible and having engalgfeihent with" the outer edge and a side of the picker stick tobe moved" by the picker stick when the latter has said" movement, and the other means being moved by the first means against said-first means'to force the latteragainst saidside of the picker stick toassist in resisting movement of the picker stick toward the adjacefnt end o'f the lay when said first means is move-a6 by the picker s'ti'ck.

HARRY A. DAVIS.

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