US2769463A - Loom stop device - Google Patents

Description

Nov. 6, 1956 R. B. DELANEY 2,769,463

LOOM STOP DEVICE Filed July 17. 195.3 2 Sheets-Shea?l l n w25. @Zn-mmm INVENTOR.

BLAISE DELANEY Nov. e, 1956 R. B. DELANY 2,769,463

LOOM STOP DEVICE Filed July 17.- v1953 2 sheets-shea 2 INVENTOR. ROBERT BLAISE DELANEY United States Patent() 2,162,463 'LQQM Ster REW-CE Robert Blaise Delaney, Darien, Conn., assignor to Bates Manufacturing Company, a corporation of. M2111@ Application July 17, 1953, No. 368,743 15 Claims. (Cl. 139-228) This invention relates to improvements in the automatic.: filling change and stop motions of a filling change type loom and, more particlarly, it relates to improvements'in a device for reducing the number of loom stops caused by lling breakage occurring when a new bobbin is`introduced into the shuttle, as described in U. S. Patent No. 2,759,497 of Peter Pelletier, granted August 2-1, 1956.

The filling change type loom, commonly called a Draper or Northrup loom, may be operated in conjunction-'with several mechanical attachments commonly known as the filling fork motion and the filling feeler motion, the purpose of which is to automatically replenish thc filling in the shuttle without interruptions of' continuous operation of the loom. It has been found, however, that these automatic motions cannot be used when weaving ne or sheer fabrics because they cause imperfections, such as cracks or thin spots to appear in the woven cloth.

VThe prior above-identified Pelletier application discloses a loom stop device which in conjunction with the iilling fork'vnd feeler motions initiates additional bobbin trans'- fei' attempts only when a lling break occurs on successive'picks following an original bobbin transfer initiated by the feeler motion. However, if a filling break occurs at any other point of time during the weaving operation, the loom is stopped.

The advantage of such an arrangement can be better appreciated if it is understood that lling breakage oc'cnrring four or more picks after a snccessfl bobbin transfer has been effectediis a relatively infrequent source o floom stoppage, and that lling breaks Vat thedoif (when anew bobbin is inserted in the shuttle) are oney of the commonestl sources of loom stoppage. In addition, it has been found that a filling change initiated immediately following'a filling break at the doi is less likely to eause an imperfection in the Weave. Thus this new loom Vstop deviceiis designed to initiate a bobbin change only at instances Where filling breaks are most frequent and :when imperfections in the Weave are less likely to occur; improved loom stop device accomplishesisub'stantially" the vsame purpose or function as the original Pelletier device but it requires fewer mechanical parts and its installation necessitates only a slight modication of the loni mechanism. In addition, insome ofthe modifications, this new device has the added advantage of being conveniently interchangeable with cer'tainof vthe conventional parts of 'the' ilingfork motion.

For a better understanding' of the present invention, reference may be liad Vto the aecompanyingdrawings in whichY Y i Figure l is a plan View of a typical loom stop device embodying the present invention shown in Working arrangement withtheconventional feeler and llin'gfork H iefons:

'Figure 2 is a view in section taken along lines 2-2 of Figure 1;

lFigure 3 is a view in section taken along lines 2 2 of Figure l, with the various mechanical 4parts shown in a dijerent position;

Figure 4 is Ya' schematic s ide view of another form of this inventn;

Eatented Nov. 6, 1956 'Figure 5- is a schemate side View o f still another form of-tbis invention;

Figure 6 is a schematic plan view of still 'another form of this iuventionaud Figure 7 is a` schematic side elevation, partly broken away, of the form ofthe invention disclosed in Figure 6. The present invention is shown inoperative arrange# ment with a conventional filling fork motion A andll'ing f eeler motion B,with only 'so 'much o f the loom mecha`- nisms being shownjas is necessary to describethis new team Step device Referring to Eigures l 2, the conventional iilling forli mofn A has e llingfcrk 10, with a hook-11 at 011e ,ends which operates 'in conjunction' with'a convenfiolalgfd Insulated Q11. the lay of the' loom.r The llig fork lll-is pivotally mounted on theright-hand end of filling fork slide 1 2, which'in turn is carried by'a grooved guideA plate 1Q secured to thebreast beam 15."

VA conventional part of the loom, known as a filling cem, imparts an oscillating movement to a llg @am follower lever 2l whereby the cam follower lever 21v and a follower hook 2 5 pir/ orally mounted on the upper nd thereof are rnoved towards the front'of the loorn` (to 'the right) on 'alternate picks.

The follfwet h QQlS 25 iS Supported by and Slides ou a bridge 2 6 formed at xune righi-hand ena-0f the fork aude 12, andY engages the filling fork hook 11 when the' latter is pivoted counterelockwise. if, forexample, a filling is interposed between the fork 19 and the grid, WhEn the-lay is moved towards the :fork 1 0 in the conventional manner, 'the filling fork 10 cannot enter the 'I'her'efoie, ille fork V1!) li S rQItd clockwise and the fork hook 11 pivoted up of engagement with the follower hook 25. 4lfigowever",ifa fllingis' not interposed between the fork Y thegridflthe `4fork is otpivoted and, thus,` th'e foilovver'liook 25 vengages the lfork hook 1 1 thereby'drwing f h nr slide 11216 neuere With @i5- ,9 6 t9 fglfs 1 ,and 2, it will be Seen that this new loom'deviceC includes a dog 28 which isl'pivotf ally mentes! 91,1 fhenside of the fork Slide'12`by mns of 'a 29,. Ihe shaft 2Q yis secured ai one end to`the siide Y.1 2Algy`suitab 'i `s, as welding; and its oppole me ,h roja a Slat 30`in the doc V28. The ained position on the shaft 2Q by means a and@ f pn indicated e131 (See Figure-11)- nie-51982513 a dow rdly egrtending shoulder '35 formedfat f ar or righthand en djand a horizon; tally extending'- houldcr formed integral with its 'rear- Werder ,letthead end. Y i

when ,thel dog2 is pivoted clockwise into the position shown in Eig'ure 2, thev forward Yshoulder 3 5 is placed pp siiion for engagement with the knock-off follower 'lever 37, au erward'shoulder 36 iS 'riveted eut cf engage# lcosponding shonlder 38 formed in -the he transferstarter arm 3 9. It be noted i f thedog V42 8 is arranged so that the position 4,by the force of gravity. g2 is pivoted ounterclockwise `in the posiwn in Figure 3,",the rearward shoulder Sois a level for' engagement with the shoulder 38 the transfer starter Jarm 39 during the nextrearwrd travel V of Ythe t`o i l ,sliie 12, and its" forward shoulder 35 is the raised out v of position for engagement 'with the knQCk- Off followerlever 37." mi .The follower lever 37, which is a conventional loom part, is connected by lever 37d fo a knec'leoirilees in a manner weillknq'wn vto these sinned in ne'ng'so that whenilever''fis' moved rearwardlyfto vtlriefleft) the knock-oir laver suits" iffedelokwise ndthrjeby i-e leoni is" snipped.h Th r v starter ar'in 3 9, which Iis aisweu been iiiffa" an, @a Sesia newbebpin id bfe inserted into the shuttle whenever it is moved rearwardly or to the left.

Itwill thus be appreciated Vthat when the fork slide12 is'moved rearwardly (to theleft) bythe engagement of the fork hook`r11 withrthe cam followerho'ok-ZSin thel manner vpreviously described, depending p'on'f the] position of thedog'28, the loom will be stoppe'dor abobbin transfer will be. initiated. y Y A Y Also, at the same time the fillingfork'slide 12 ismoved to the left, a shoulder 42 (see Figure V1)'on the left-hand end of the fork slide 12 engages aY corresponding shoulder 43 `formed in the upper end of the let-ol arm 44, 'and the latter is thereby moved to the left. Y The let-off arm 44 is connected with a conventional loom part'knownas the let-olf mechanism, which is arranged so that whenever the arm 44 is moved rearwardly, the conventional take-up roll, on which the woven fabric is wound, is let back a distance of two picks. This Vmotion is necessary in order toprevent a crack from appearing in the woven fabric where a filling is missed. It will be noted that in Figures 2 and 3, the let-olf arm 44 is only partially shown in order to simplify the drawings.V

On the return movementlof the cam follower lever 21 (and the follower hook 25), the fork slide 12 is returned to its initial position by means of a spring attached .at one Y end to the bottom of the fork slide 12V and its other end to the fork slide plate 14. At the Vsame time, abiased spring 45 connected to the shoulder 43 of the let-olf arm 44 and the lling fork'slide plate 14 returns the let-off arm44 to its original position. Also,- inA the -event the transfer starter arm 39 has been moved rearwardly, a spring 46 connected to the breast beam 15 at 47 and with' the transfer starter arm 39 returns the transfer starter arm to its initial position. Y

. As previously mentioned, the dog 28 is pivotally mounted so that it is normally rotated by means of gravity into the'position shown vin VFigure 2; VWhen in this position the forward shoulder 35 on the dog 28enga`ges the knockoi follower lever 37, causing the loom to be stopped, whenever the fork Yslide 12 is moved rearwardly because a 4 g e n A pin 60, secured by suitable means to the side, of the feeler slide 53, is disposed just in front of a lever 62,

which is part of the new loom stop mechanism C. When the'lever 62 is shifted rearwardly V(to the left) by thepin 60, the dog 28 is simultaneously pivoted counterclockwise by a mechanical arrangement next-,to be described.

.The lower end'63 of the lever 62 isY welded or otherwise secured to the side of a ratchet 65 having two teeth 66 and 67. The ratchet 65 is rotatably mounted on a shaft 69, which is supported in a generally horizontal Yposition just above the'fork slide 12 by means of a bracket'70.l

The bracket 70 in turn is secured to the side of the fork guide plate 14 (see Figure l) by suitable means.

A rodr74 is pivotally mounted on thel upper Vendf-of the lever 62, and its opposite end extends through an opening 75 in a second lever. 7.6. AThe second lever turn is welded or otherwise secured at its opposite end to the Vrearward portion 77 of the dog 28. Nuts-78 and 79 wound on the threaded portion 80 of therrod 74 are disposed on either side ofV the ,opening 75 in the second lever 76. y e y v Thus, when the feeler slide 53 is moved rearwardly tof wards the transfer starter armY 39, the lever 62 is rotated counterclockwise Vby the feeler slide pin 60. This in turn causes the nuts 79Yon the rod V74 to engage the sec; ond lever76, and the dog- 28 is thereby rotatedcounterclockwise into the position' shownzin Figure 3. When in this position, the rearward shoulder 36 of the dog '2,8A

iilling` is not interposed between the filling fork hook -10 and the grid.

Y Y' The following is a description-ofthe mechanismwhich,

under certain conditions, will rotate the dogZScontei-l clockwise,rand thereby operate the transferpstarter arm 39 whenever the `fork Vslide 12 is moved to .the Lleft.

Withreference tov Figures .lg and 2th/e'conventional filling feeler motion B, the object of which ,is'rto detect the point of approaching exhaustion of the filling carried on the bobbinrin'the'vshuttle and then to initiate'a bobbintrans- Y fer, Vis actuated by a llingfeeler which is"mounted Vto .the breast beam 15. Each time the lay isfm'oved forward (towards thegfeeler 50'and the fork 10), the filling feeler 50 is inserted through a slot in the sidey of the shuttle then resting in the adjacent shuttle box, and comes in contact with the yarn wound on the bobbin carried Y therein. At the same timeyartillingncam follower trip 51 secured tothe upper end of therilling cam follower lever 21,' is moved towards (but does not engage) the righthand end of a feeler slide A53. TheV feelerislide 53 is pivotally attached to its left-hand or opposite fend tothe tsrransfer starteri'arm V39'by means of a pin 5 4 andcotter'pin When'fthe filling on the bobbin in` the shuttle 'is' nearly exhausted, the feeler 50 is moved towards theffeeler slide 53, whichin turn moves Vthe rod 58-in the same direction (see Figure l). The end Vof the 'ro'd58 -is attached to a lug 59 which is pivotally mounted in the front (right) end of the feeler'slide 53. l Thus, when'the rodSSis moved trip 51, Vwhen the latter is moved towards the `transfer startis placedV in position for engagement with the Vtransfer starter arm 39 and the forward shonlderS'is' raised' out of position for engagement with thefknock-ol follower leverl 37.v As a result, on VAthe .next successiveralternate pick, if theiilling isjnot interposed between theyfork-vlt) and the grid, a second bobbin transfer will Ybe initiatedfV In order to pivot VYthe dog 28 clockwise backwto its initial ,position (as shown in Figure 2), .after'the Vsecond bobbin transfer has been initiated, the` ratchet 65 is ro-V tated by a `pawl 84. The Ypawl .8 4 is pivotally mounted v by means of a pin `85 between shoulderV 86formed thereon anda cotter pin 87. rlhel opposite VVend of the -pin 85 is adjustably mounted kthrough aV Aslot89fformed in the cam follower extension lever 901by means: of a'washer 92 and nut 93.V The lower end ofthe extension member 9,0is secured bysuitable means, such aswelding, to end of the camfollower lever 21. Y'

The pawl 84 is thus made movably responsive to the conventional oscillating movement of the cam follower lever -21 which, as previously explained, isy moved'by con;

er arm 39. As a result, therfeelervslidej53'is shifted to the left, andin turn, thetransfer starter arrn39Y ismoved to the left thereby initiating a bobbin transfer.

ventional cam means towards and away from kthelayson alternate picks. The teethV66 Vand, 67on the' ratchet Y65 are arranged so that the pawl 8,4'will rotate the ratchet and the lever 62 clockwise. vThe nuts'79 Von the rod 74 are thereby moved out of engagementwith the second lever 76, and thus the dog 28 is rotated counterclockwise into the position shown in Figure 2.. i

To further explain the operation l of ,theV lnew floom stop device C, it will beY assumed that during therno'rmal operation of the loom, the mechanical partsof'thelnew device, as well as those of the lling forklandY `filling feeler 1 motions A and B, are inther position shown in Figures 1 and 2, respectively. Furtherfit' will be assumed that the filling forkY 10 andthe filling fork'vhooklLaref-not pivoted clockwis'erbyra iilling being interposed between the grid and theforkrll) thus indicating a filling s-Ynlissed.

As the cam follower hook25rr'ismoved away fromthe Vloom (towards the ,left) it engages the iillingfork-hook 11 and causes the lilling fork slide 12 to be ,shifted `.to theY left.Y As a resulte; thelshoulder'35 onthe,dog28,' Y Y which as previously explained is normallyjrotatedl clockwiseby gravity into theposition shown infigurefZf, en-V `gages the knock-joliv followerrjlever ,37 and the. loom'is stopped. Y i j y Next, referringto Figures 1 and Zit will-be Vassumed that the fork 10 is pivoted clockwiserthus indicating that Ia filling is interposed between the fork and the grid. It

will. also be assumed that when the feeler 5.0 is brought intQ Contact with the yarn carried by the bobbin the shuttle, it indicates the yarn is about to be exhausted. As previously described, this causes the feeler slide 53 and the transfer starter arm 39 to be moved rearwardly, thereby initiating a bobbin transfer on the next successive pick. Also, as previously explained, the pin 6 0 on the feeler slide 53 moves the ratchet lever 62, which in turn causes the dog 2S to be pivoted into position for engagement with the transfer starter arm as shown in Figure 3.

As the cam follower lever 21 is moved towards the lay (to the right) on the return stroke, the pawl S4 engages the first tooth 6'7 of the ratchet l65 and the latter is thereby rotated clockwise a slight distance but not a suicient distance to move the dog 28 back into engagement with the knock-B:` lever 37 If on the next successive pick, the fork 10 indicates a filling is missed (because the rst bobbin transfer was unsuccessful), the fork slide 12 is shifted rearwardly and the rearward shoulder 36 on the dog 2S engages the transfer starter arm 39, thereby causing the latter to be shifted rearwardly. This causes another bobbin to be inserted into the shuttle on the next successive pick.

As the cam follower lever 21 is shifted to the right, the pawl 84. engages the second tooth 66 of the ratchet 65 and thereby pivots the ratchet 65 back to its initial position. As a result, the dog 28 is pivoted clockwise a sufficient distance so as to place the forward shoulder 35 of the dog 28 in front of the knock-off follower lever 37, and its rearward shoulder 36 out of engagement with the transfer starter arm 39 (see Figure 2).

If on the next successive pick or picks, the filling is not interposed between the fork 10 and the grid, the fork slide 12 is again shifted towards the transfer starter arm 39 and the loomis stopped vbecause the shoulder 35 is now placed in position to engage the knock-off follower lever 37.

Thus, it is apparent that immediately following an initial bobbin transfer initiated by the feeler motion B, the new loom device C will initiate a second bobbin transfer attempt should the rst one be unsuccessful, and if the second transfer is also unsuccessful it will then stop the loom. This stop motion is necessary because if both bobbin transfer attempts are unsuccessful, it is apparent that mechanical adjustment of the loom is necessary in order to correct the operational failure. Also, if no stop motion were provided the entire battery of new bobbins would be exhausted unless the defect were detected by the operator.

Itis important to note that the probability of a successful bobbin change after a first transfer attempt is made is greatly increased because when a bobbin is inserted into the shuttle it is supported along its entire length by the yarn on the bobbin beneath it. Therefore the second bobbin will not be tilted as would be the case where thepreceding bobbin is exhausted. In addition, the yarn on the ejected bobbin cushions the shock of the new bobbin upon the latters entrance into the shuttle.

Figures 4 to 7 disclose furtherv modifications of this new loom stop mechanism. tvwill be noted that in these drawings, the transfer starter arm 39, the feeler slide 53 and the cam follower lever 21, which were previously described in detail, are schematically shown, and the other conventional loom parts are entirely omitted in order to simplify the drawings. Also, the dog 28, shown in Figures 4, 5, 6 and 7, is pivotally mounted on the fork slide 10 in the manner described in vconnection with Figures l-3, and is normally pivoted clockwise by gravity, thereby placing its forward shoulder 35 in position to engage the knock-olf lever 37, and with its rearward shoulder 36 out of engagement with the transfer starter arm 39.

With particular reference to Figure 4, it will be noted that the dog 28 is pivoted counterclockwise by means of a Cam member 98 which is, ratatahlt atoms@ @Y suitable means such as Pin VV9 9,.o 1 1 d r near its forward (rghtfhand) end. is fastened at one end to the upper edge of the cam 9S, extends upwardly in a generally vertical direction .and is disposed just in front of the feeler slide pin 6 0. The cam member 98 is suitably designed so that when the cam arm 101 is pivoted to the left by the feller slide pin 60, the cam shoulder 102 engages a slide plate 1 '03 mounted on the upper surface 104101? the knock-pif lever 37, and thereby the dog 2S is pivoted counterclpclrwis'e. As a result, the forward shoulder 35 of the clog 2 8 is raised out of engagement with the @Nk-off lever 37 and its rearward shoulder 36 is placed in position to en.- gage the shoulder 38 in the upper end 'of the transfer starter arm 39. 4

The return mechanism '105, to rotate the vCain ,9,8 clolz: wise back to its original position (as shown in :gute A), includes a spring 106 which is connected at its. Appos'ite ends to the dog 28 and the cam 98, respectively. stop member 107 formed in the side of the dgg 28 prevents the cam 98 from rotating ltoo far in the clockwise dif rection.

When the cam member 98 is rotated counterlpcltwise (by the feeler slide pin 6 0) a latch member .11.0, pivotally mounted at `111 to the side of the dog 2, engage's a tooth 112 formed in the side ofa cam 98, and prevents the cam 93 from being rotated `vin the opposite direction by the spring 1&6. A ,compression spring 115 mainrains the latch member 1 10 yin close relationship the `cam tooth 112. f i

One end 116 `of a rod 117 `is s lidably mounted adjacent to the opposite end 119 of the latch'niernber'-11f0 slidably mounted channel member `120, secured rivets 121 to the sideof the dog 2 8. -The rod 117 is Y ably supported by brackets 1 25 and 126 ,which may e secured to the breast beam .15 (Vsee Figure o r feeler slide 53. A button I12281, which fisformed on the opposite ,endof the rod 1-17, isdisposed tto d just in front of a cam follower lever vl(. Qrthe"ollower trip 51, see Figure l). `A spring 130 oncentricallygisr posed about the rod V117 andV positioned @etw en the ,A st bracket 125 and avcollar )131-foijmed aboutgh o d 7 normally urges .the rod -1'17 IVtowardsthefollower ieverwl and awayfrom the latch member .110; v

As previously explained, thefollowerlever isgscillated towards and away fromtheloonron altern by conventionalcammeans. lfhus, the-rod ,is moved by the follower lever 21, and the vlatch ,member pivoted by the Yopposite Vend A116j )f-tl'rerfrod 1317, Qutf engagement with the Cam th 11.2, 0.1.1 alternate risks ofthe loom. Y

When the follower lever 21 is moved the ,opposite direction, the spring 130returns `thero c 1;1 17t o its original position (as lshown inFigure 4)-and the spring 11S-,pivots the .latch member -into engagement .with ,second tooth 133.formed on the side A of ,the carni-9&8. reis-aresult, the cam member -98-is rotated clockwise .a `slight distance by spring 106. It willqbegnoted that-this arnonnt of rotation is not'suicient to move theforward Shoulder 35 .of the dog 28 into-engagementgwihtthe knocko lever 37. Y

Thus, if mme bobbintransfeaiainatedmy .the realerslide 53 is unsuccessful, and iafllingis `1`1ot;interposed between y,the fork 1 0 and Ithe ,gridLseeFigures -1-'-;3.)..on the next successive alternate pick; (as the :follower-'lever 21 iS moved te the: lett), va :second :bcbbinrtransferiwiu be initiated. At the `s arne time, the ,rod 1.17: is1;again moved to the left and the latch member 1- 10". i s pivoted gagement Vwith the transfer starter arm 39. Thus, if the secndbobbintr'ansfer is also unsuccessful when'thedog rection bythe rod 117 because the'channel member 126 v Y supporting the rod 117 is slidably mounted.

The modiiication'disclosed in'eFigure 5 is similar to the previously Vdescribed modication shown in Figure 4,

except that the Vreturn Vmechanism generally indicated at Y 135 is modified. Y lIn the'modifcation shown in Figure 5, la pawl 136, which engages teeth 137 and i138 formed along the upper edge, of the cam' member 140, is pivotally mounted at 141 to the upper end of a lever 142. The opposite end of the flever 142 'in turn is pivotally mounted at 144 to -the dog l28,`and its middlefportion 145 is disposed just in front of the end 116 offth'e rod 117i The rod 117 is'similar in design Vand operation to that disclosed in Figure 4.

A spring 1147, disposed between .a stop member 148 and the middleV portion 145 of the -lever 142, urges the :lever towards the end 116 of the rod 117, into engagement with a second stop member 1.49.' The stop member 148,V which alsoserves to prevent the `cam member 140 from being rotated too far in a clockwise direction, and the stop. member 149 are secured by suitable means to fthe side of the dog 28. The pawl 136 is disposed so that its shoulder l-36a is positioned just forward of the cam Vteeth 137 and 138 when the dog 28 is in position to engage the knock-off lever 37. l

A member 60a of rectangular cross-section is lsecured clockwise. yInthis connection, it is important'to note rthat the member 60a raises the pawl =136 before the cam member 140 4is rotated. As a result, the dog 28 is pivoted counterclockwise and its forward shoulder is raised out of engagement with the knock-oh? follower -lever 37 and its rearward shoulder 36 is placed into position to engage .thetransfer lstarter arm 39. Thus, in the event the first bobbin transfer is unsuccessful, the dog 2-'8 is in position to engage .thetransfer starter arm 39 on the next successive alternate pick. l Y

f' Also, at the same time, the feeler slide 53 is moved to 'the left, the follower lever 21 is movedV to fthe deft thereby causing the rod l117 to pivot theV lever 142 -in the same direction. yOn the -next pick, when the feeler slide 53,

the follower lever 21, and the rod 117 are moved to the right, the pawl 1'36 drops down into engagement with the first tooth 137. Thereafter, the spring 147 moves the I1ever142 and the pawl 136 to the right, thereby rotating .the cam member clockwise, a slight distance.V

8 Y Y armV 39. Thus,'if7the Ysecond bobbin transfer'is unsuceessful, and the dogzrs iisQmoved.totheV left, thelo'om'is immediately stopped. 1 V t Figures 6 and 7 'disclose stillanothe'r vmv. dificationof' this new loom ystop device in which thecam member is returned to its original position (to engage thev knockf' oif -lever 37') as shown in Figure 7, by means of artimex the Vcam member 155 respectively (see Figure ,fl Y The spring 165 lis arranged so that it normally urges the cam member 155 in a clockwise direction. Y

With particular Vreference to Figure 6, it will he seenY that a circular gear is also rotatably mounted on the shaft 158. The Igear 170 is urged towards the cam member 155, by a spring 171 disposed about the shaft 158 and positioned between the gear 17 0 and the inner wail of the timerY housing 161. A circular series of teeth 174'and =175 are formed about the adjacent sides of the cam mem-A ber 155 and the gear 174), respectively. lt will be noted that the teeth 174 and 175 are facing in the opposite directions so that when the cam member is rotated counterclockwise, the Vinclined rearward edges 174:1 and 175:: thereof are moved into engagement. The gear 170 is thereby moved away from the cam memberY (against the tension of the spring 171),v and the gear lis not' rotated counterclockwise. member 1'55 Vis rotated clockwise by the cam spring 165,

.the leading edges of the teeth 174 and 175 are maintained t in'engagement by the spring 171, and lthe gear 170 is thereby rotated inthe same direction.

The gear 17() engages a gear 178 of smaller diametercarried by a second shaft 179. The shaft 179 is jour-A nalled at its opposite ends through openings 180' and 181 formed in the dog 28 andthe housingV 161. Al weighted wheel 185 is also carried bythe second shaftV 179 and is disposed between the smaller gear 178 and the dog 28. Y

With reference to Figures 6 and 7, that when the feeler slide 53 is moved rearwardly (to the left) toinitiate a first bobbin transfer, the feeler slide pin 60 engages an arm 187 which is vsecured to the upper edge of the cam member 155. As a result,

the cam member 155 is pivoted counterclockwise whichk f f is raised out of engagement with the Vknock-off 'follower As in the previous modifications, this partial rotation of the cam member 140 is not sucient to move the forward shoulder 35 of the dog 28 into position for engagement "with the knock-off follower lever 37.

lever 37 and the rearward shoulder 36 is placed in posi-fV tion to engage the transfer Vstarter arm 39. Therefore, as in the previously described modifications, if the rst bobbin .transfer is unsuccessful, a second `bobbin transfer will be initiated on the next consecutive alternate pick. Y

The timerV mechanism 156 is arranged so that the cam member155 is returned to its original position (with the forward shoulderr35 :of the dogV 28 engaging the knock-off lever 37) as shown in Figure 7, inthev same amount of time that it wouldtake the loom to complete four consecutive picks. Therefore, if the secondbobbin transfer is also unsuccessful, when the'dog 28 is moved' Y to the left, the loom is stopped.

It will be appreciated that the arrangement and Vdesign of the various parts in the Ytimer mechanism 156 are subject to considerable modification, and that other types 0f timer mechanisms well known in the art may` be utilized, if so desired. Also, all modificationsy of this Y* Y' new loom device may be modified in a manner 'appa/r-V ent to one skilled in the art, so as tor'pro'vide a greater or lesser number of bobbin transfers after a rst transfer is initiated by the feeler motion.

On the other hand, when the'camiVV it will be seen n While this device is described in connection with a particular model of a Northrup loom, it is to be understood that this invention may be applied to other types of looms by a slight modification of various parts. Also, it is to be understood that this new loom stop device may be adapted for use with multiple harness looms and/or when weaving a multicolored fabric without departing from the basic concept of this invention.

Furthermore, it is to be understood that the various mechanical parts of this new loom stop device are subject to considerable modification as would be apparent to one skilled in the art. Therefore, the form of the invention described above should be considered as illustrative and not as limiting the scope of the following claims.

I claim:

l. In a loom for inter-posing a filling between selected Warp ends and including an actuatable filling change mechanism and an actuatable loom stopping mechanism, a device comprising a filling detecting means movable when a filling is missed, a dog adjustable to either of two positions and movable bodily in response to the movement of said detecting means, said dog actuating said loom stopping mechanism when disposed in one position and actuating said filling change mechanism when in another position, means to detect the approaching exhaustion of the filling and then to actuate said filling change mechanism, and means responsive to said means when the latter actuates said filling change mechanism to move the dog temporarily from said one position to said other position.

2. A device as set forth in claim 1 wherein said dog is disposed in position to actuate said loom stopping means and out of position to engage said filling change mechanism at all times except when it is adjusted into position to engage said filling change mechanism when the approaching exhaustion of the filling is detected by said means for detecting the approaching exhaustion of the filling before the detection of a filling miss by the filling detecting means.

3. A device as set forth in claim 1 including a movable lever actuated by said means to detect the approaching exhaustion of the filling, and wherein said means for moving the dog to said other position includes a mechanical connection between said movable lever and said dog.

4. A device as set forth in claim l including a ratchet having a plurality of teeth, said ratchet being rotatable from an initial position to another position in response to the detection of the approaching exhaustion of the filling, and a reciprocating pawl to engage said ratchet and return it in increments to the initial position.

5. A device as set forth in claim 4 including means connecting the ratchet and the dog whereby the dog is adjusted from one position to said other position by the rotation of the ratchet from its initial position to said other position.

6. A device as set forth in claim l including an adjustable timer mechanism set by said means for detecting the approaching exhaustion of the lling and means responsive to said timer mechanism to effect the return of said dog to said oneposition.

7. In a loom for interposing a filling between selected warp ends and including an actuatable filling change mechanism and an actuatable loom stopping mechanism, a device comprising a filling detecting means movable When -a filling is missed, a dog responsive to the movement of said detecting means to actuate said filling change mechanism in one position thereof and said loom stopping mechanism in another position thereof, a cam means which when moved in one direction moves said dog into position for actuating said filling change mechanism and when moved in another direction moves said dog into position for actuating said loom stopping mechanism, means to move said cam means in a direction to move the dog into position for actuating the filling change mechanism, and means to move said cam means into position for actuating the loom stopping mechanism after the dog has been moved into position for actuating the filling change mechanism.

8. A device as set forth in claim 7 wherein the movement of said cam means in a direction to move the dog into position for actuating the filling change mechanism includes means to detect the approaching exhaustion of the filling.

9. A device as set forth in claim 7 wherein said means to move said cam means in a direction to move the dog into position for actuating the loom stopping mechanism includes an adjustable timer mechanism, and means responsive to said timer mechanism to move said cam means in said other direction a predetermined duration of time after said cam means is moved in said one direction.

10. In a device as set forth in claim 7 wherein said means to move said cam means in a direction to move the dog into position for actuating the loom stopping mechanism includes teeth formed on said cam means, a movable pawl to engage said teeth, and means to oscillate said pawl and thereby rotate said cam means in said other direction on a predetermined number of picks after said cam means is moved in said one direction.

l1. In a loom for interposing a filling between selected warp ends and including an actuatable filling change mechanism, an actuatable loom stopping mechanism and a filling detecting means movable towards said filling change mechanism and said loom stopping mechanism when a filling is missed, a mechanism comprising a dog pivotally mounted on said filling detecting means, a rst shoulder formed on said dog engageable with said loom stopping mechanism, a second shoulder formed on said dog engageable with said filling change mechanism, a cam member rotatably mounted on said dog, which when rotated in one direction, pivots said rst shoulder of said dog into position for engagement with said stopping mechanism, and when rotated in another direction, pivots said second shoulder of said dog into position for engagechange mechanism to rotate said cam member in said` one direction and means on said dog to rotate said cam member in said another direction a plurality of picks after said means rotates said cam member.

14. In a loom for interposing a filling between selected Warp ends, a device for reducing loom stops comprising filling detecting means to detect a filling miss, means to detect the approaching exhaustion of yarn on the bobbin, means to stop the loom, means to initiate a bobbin change, a movable member actuatable by the filling detecting means which, in normal position, effects the operation of the means to stop the loom and, in shifted position, effects the operation of the means to initiate a bobbin change, and means controlled by the means to detect the approaching exhaustion of yarn on the bobbin to move said member to the shifted position.

l5. A device as set forth in claim 14 including means to maintain said member in the shifted position for a predetermined number of picks, and means to restore said member to normal position to stop the loom after said predetermined number of picks.

References Cited in the file of this patent UNITED STATES PATENTS

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