US1795841A - Filling fork and grid mechanism for looms - Google Patents

Description

March 10, H. A. DAVIS FILLING FORK AND GRID MECHANISM FOR LOOMS Filed July 10,..1929 2 Sheets-Sheet 1 Fig. 1.

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Harry A. Davis 7 b /MJMkW March 10, 1931. H. A. DAVIS 1,795,841

FiLbING FORK AND GRID MECHANISM FOR'LOOMS Filed July 10. 1929 2 Sheets-Sheet '2 Fig.

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Harry A. Davis byMwA M Patented Mar. 10, 1931 HARRY A. DAVIS, 01' 'I-IOPEDALE, MASSACHUSETTS, nssreizron-ronnarnn eon'ronm TION, F HOPEDAL'E, MASSACHUSETTS, ,n-conronnrron or MAINE- FILLING FORK AND GRID MECHANISM FOR LOOMS Application filed m 10,

these elements cooperate when the lay beats up in .such a manner that if the filling is present in front (of the grid, the normal operation 1.5 of the loom will continue, but if the filling is absent due to exhaustion, breakage, or any other reason, the cooperative action of the fork grid, detecting this absence .of the filling, will effect thestopping of the loom or the desired change in the operation of the loom.

It has been found that when cloth is being woven with a light filling, with rayon, or with brittle and easily breakable filling, the 12 impactof the fork and grid elements against the filling damages and even breaks the filling,,thus either injuringthe quality of the cloth or effecting an undesired stopping or change in the operation of the loom with 80 consequent loss in efliciency. Repeated tests have shown that a very large percentage of filling breakage which occurs under these conditions in the 100m operation is due to this action of the fork and grid on the fillto the fork and grid with the result that there is a variation in the force of the impact, (2) the tension on the filling varies due the position of the shuttle, the conditions in the shuttle, the size ofthe filling mass on the bobbin, the action of the feeleron the filling when a filling replenishing mechanism is employed, (3) the bars of the elements, that is, the tines of the fork and the ribs of the grid, are frequentlynot inparallelism or in par allel planes with a resulting uneven action ,of at theseveral bars when these elements cooperin Various factors enter into this undesirab e result, amongwhich the following have been observed, (1) the filling does not always lie inthesame vertical position with respect 1929. .Serial No. 377,115.

,ate in {engagement with the filling, frequently there is a variation in the setting or adjustment of the fork-and the grid, the

bars of either one or both elements, that is,

the tines of the fork andthe ribs of the grid, may be bent or uneven. Furthermore, even when theconditions under which the fork and grid cooperate are at the best, there is a very substantial impact on the filling during the detecting operation because the elements must be fairly rugged in order to perform their function of effecting the stopping or change of operation .of the loom. The fork I I is usuallyamounted to move on a pivotal axis each time the lay beats up with the filling present and it must be steady in its movement and must notfiutter, or it would rebound .and function improperly. I

The present invention consists in construct ing one or the other of the fork and grid elementsso that the barsthereof areseverally and independently yielda-ble away from the ,otherelement in thepdirection of their cooperative movement so that upon impact a slight independent yield of these bars may take place, thus automatically securing j-ust suflicient force of impact on the filling to finsure the proper functioning of the mechanism without deleterious results to the fill- .111

These and other objects and features of the invention will appear more fully fromthe accompanying description and drawings and will be particularly pointed out inthe' claims. As the general construction and operation of a loom and of filling fork and grid ,mech- 'anism is well known and familiar-to those skilled in the art, it will only be necessary here to illustrate and describe'those elements directly concerned with preferred embodimentsof the present invention. a t

The drawingsshow several forms which the invention may take as applied both .tothe fork element and the grid element.

V In .the drawings-z i .Fig. 1 is .a side elevation partially invertical cross section of an ordinary type of filling fork and'grid mechanism with portionsof a loom immediately associat.ed.t'he-reinc 'bar 13 of the fork slide.

with and with one form of the invention embodied m the fork element.-

Fig. 2 1s a detail in vertical cross section 7 taken on the line 22 of Fig. 4 of the fork element shown in Fig. 1.

Fig. 3 is an elevation looking toward the rear of the fork element shown in Fig. 1.

Fig. 4: is a bottom plan view of the fork element shown in Fig. 1.

Fig. 5is a view similar to Fig.2 showing another form of the invention embodied in the fork element.

Fig. 6 is a top plan view of the construction shown in Fig. 5.

Fig. 7 is a view similar to Fig. 1 with an other form of the invention embodied in the grid element.

Fig. 8 is a front elevation of the grid element shown in Fig. 7.

Fig. 9 is a view in vertical cross section of the grid element shown in Fig. 7.

Fig. 10 is a bottom plan view of the grid element shown in Fig. 7

In the construction shown in Figs. 1 to f,

inclusive, the usual oscillating lay structure of the loom comprising the swords 1 and lay 2 is shown as provided with a grid element 8 of the usual type. Such a grid is rigidly supported with its parallel spaced bars or ribs standing parallel with and at the rear of the path of the shuttle. The stand or support iis secured to and projects rearward from the breast beam and carries the usual filling fork slide 5 mounted to slide forward and rearward therein. The filling fork ele ment comprises a body 6 pivotally journalled on a bearing 7 between the bifurcated arms 11 carries pivoted thereto the hook 12 between the arms 8 and resting upon the cross The operation of these elements is a familiar one. Each time the lay beats up, if the filling is properly laid in front of the grid, it is carried by the grid against the tines of the fork, raising the tail 10 out of the path of the hook 12. But if the filling is absent, no movement of the fork takes place and as the'weft hammer 11 swings forwardly, the hook 12 engaging the tail 10 gives a forward movement to the fork slide which through suitable mechanism acts to effect the stopping of the loom or a change cesses 14, one for each tine. These'recesses present a rear wall constituting a stop to hold the tines in parallelism and a front wall 15 inclined forward and downward so that the recess is of considerable width at the bottom. At the upper front portion of each recess the body presents a shoulder 16 and these shoulders are parallel with the journal axis 17 of the body and constitutes a pivotal axis for the tines. The tines are bent into hook shape at their upper ends so that they may swing forward and rearward on the shoulders 16. Forward of each tine an individual spring 18 is mounted in each recess 14 between its tine and the front wall of the recess which is bored out to receive the spring. Thus each filling engaging bar or tine is normally held against the stop or rear wall of its recess with all the tines in parallelism and thus each bar or tine yields severally and independently forward against the action of its spring 18. The tail 10 is in the form of a Wire loop having dependinglegs 19 fitted into apertures in the body. The top plate 20 of the body is separate from the main portion of the body so that both the tines and the tail may be inserted in the body through the top and then held in position by the top plate secured in place by a suitable screw or securing device 21. The forwardly projecting ends 22 of the bars or'tines are bevelled off as shown to permit the swinging or pivotal movement of the tines in a horizontal recess 28 shown as formed partly inthe main body 6 and partly in the cover plate 20.

In Figs. 5 and 6 is shown a slightly different form of filling fork element from that already described but for use in a similar combination. In this construction the body 2% has a similar journal bearing 25 to that already described. The cover portion 26 in this case is located at the rear of the body and secured thereto by screws 27 with the recesses 28 for the fork bars or tines formed partially in the body and partially in the cover, the tines being limited in their rearward swing by the inner stop surface of the cover and in their forward swing by the body. In this case individual contractile springs 29 are secured to the upper forwardly bent ends of the tines 30, herein shown as four in number, and to the body and act normally to hold the tines in parallelism against the stop sur face of the cover and permit the tines to yield separately and independently in a forward direction. The looped tail Slof the fork element is in the form of a flat recessed plate secured to the top of the body by suitable rivets or screws 82.

' lnthe construction shown in Figs. 7 to 10, inclusive, the general arrangement and operation of the fork and grid elements is the same as already described, but in this case the grid element is the one inwhich'the parallel bars are separately and independently slots 53 formed 45 and by memsai yieldable while the filling fork element is shown as of the usual construction. The lay swords 33, the lay 34, the filling fork stand 35, the filling fork slide 36, the weft hammer 37 and the hook 38, are all shown as of the same construction as in Fig. 1. The filling fork of the usual type comprising the body 39, the depending bars or tines 40 mounted therein to cooperate with the grid and the tail 41 mounted therein to cooperate with the hook 38.

The grid element in which one form of the main feature of the invention is here embodied is shown in detail in Figs. 8, 9 and 10. As shown, the body of this element comprises a. U-shaped frame 42 having a lug 43 extending laterally therefrom by means of which the frame is secured to the lay sword, as by a suitable bolt 44, and wherein arms 45 and 46extend laterally from its rear ends in the direction opposite to the lug 43. The several filling engaging bars or ribs 4? normally stand in parallelism in a substantially vertical plane extending parallel to and at the rear of the lay. These bars at their upper and lower ends are bent rearwardly at 48 and 49. These bars or ribs are mounted in the body or frame of the grid element to swing severally and independently thereon in a direction normal to the plane of the bars. This is secured by mounting the rear end of each portion 48 in a separate slot 50 in the arm bending the rear ends of the portions 48 to form bearing portions 51 mounted upon a common'bearing stud 52 extending through the arm 45. The rear ends of the lower portions 49 are, guided in individual in the lower arm 46 and a block 54 removably secured to the rear thereof, as by a positioning pin 55 and a screw 56, so as to form a part of the arm 46. These rear ends of the lower. portions 49 of the grid bars are upturned as at 57 and individual springs 58 are seated, between these upturned ends and bores in the block 54. The rear surface of the arm 46 engaged by the upturned ends 57 forms a stop surface positioning the bars 47 of the grid element in parallelism when at the limit of movement in the'filling engaging direction and the individual springs 58 mountedb'etween each of these grid bars or ribs and the body or frame of the grid element act yieldably to hold the bars in this osition and also to permit independent yielding of the bars away from this position.

In the various forms thus described as illustrative embodiments of the invention, it will be seen that the fork and grid elements have relative bodily movement toward and away from each other, and that each has a plurality of filling engaging bars such as the tines of the fork and the ribs of the grid which are sufiiciently still to be normally in flexible, being preferably made of metal, and that the filling engaging bars of one of these elements are asevsrallygand independent y yieldalele away from the ietherilement i the direction of the relative: bodily. incremen which takespl'ace ihetweeni' he two elements Fiurthermore and more specifisally in whicheaer element the. mvention may be embodied, there are a plurality of para le filling tern gaging sbars mounted element" and. severally and 1 independently yieldablethereoll in idinectionnomual or in general at rightiangles bars. 7 Aga n in either specif ccaconstrnction shOyvH the-Jmdypf the elemen pnov des means for positioning all of the fillinmengag; loarsinrpi mlleli-sm wh n atrthe irnit o their incitemen in a fil i g eng ging tion individual springs arem -ted twee leach bar-and t e ody oi -t e element which actyi'el ab y to ho d .t eha-r' i 'thlis po i n and also to; per it the in ependent yield fz li bars aw y:f oxns idpQsi 0a heinvention h sn ejsents a c struction in which, a filling dete ting mechanism of t s gene al type, th desired-de ecting actio may be secured wi h a minim mvda ger of injury-to ol -breakageogfrtheyarn. v v Having thu d v i e t-he i manenthat i cl im d as new, and es r d oib sc uted y Lett s Pate t, is; v a

1. A filling detecting mechanism for a loom comprising'coopeaating fork and grid elements having relative bodily movement to theaplail e of the i ion the ,body bf; th

toward and away from each other and each having a plurality of filling engaging stiff bars in which the bars of one element are mounted to yield severally and independently away from the other element in the direction of said movement;

2. A filling detecting mechanism for a loom comprising cooperating fork and grid elements having relative bodily movement toward and away from each other and each having a plurality of filling engaging stiff bars in which the barsof one element are mounted therein for several and independent I movement in the direction toward and away from the other element and are spring-actuated toward the other element. 7 Y

3. A filling engaging element and grid filling detecting mechanism comprising a body and a plurality of parallel lling engaging stiff bars body to yield severally and independently thereon in a direction normal to the plane of the bars.

for a fork I mounted on the 4. A filling engaging element fora fork and grid filling detecting mechanism comprising a body, a plurality of parallel filling engaging stiff bars mounted on the body and severally and independently movable thereon in a direction normal to the plane of the bars, and individual springs mounted between each i bar and the body permitting the bars to yield independently out of parallelism and acting normally to retain the bars in parallelism.

5."A-fil1ing engaging element for a fork and grid filling detecting mechanism comprising a body, a plurality of normally parallel filling engaging stiff bars pivotally mounted on the body to swing severally and independently thereon in a direction normal to the plane of the bars, means for positioning the bars in parallelism when at the limit of movement in the filling engaging direction and individual springs mounted between each bar and the body acting yieldably to hold the bars in the said position and to permit independent yield of the bars away from said position.

6. A filling fork for a filling detecting mechanism for a loom comprising a body having a journalbearing, a tail rigid with the body and extending generally radially 7 from said body, a plurality of filling engaging tines pivotally mounted on the body on an axis parallel with the journal bearing and extending in a direction substantially at right angles to the tail, a stop on the body positioning the tines in parallelism, and incliw vidual springs between the body and the tines acting to hold the tines against the stop and to permit the tines to swing independently on their pivotal axis away from the stop.

In testimony whereof, I have signed my name to this specification.

HARRY A. DAVIS.

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