US2638941A - Loom for weaving - Google Patents

Description

May 19, 1953 I 'r. HINDLE LOOM FOR WEAVING 4 fleets-sheet 1 Invenl or I Itv'llllll Illl llll Ill Filed Sept. 7. 1950 5 y e n r 0 H A May 19, 1953 T. HlNbLE LOOM FQR WEAVING 4 Sheets-Sheet 2 Filed Sept. 7, 1950 7 M alm;

S y e m H y 1953 T. HINDLE 2,638,941

LOOM FOR WEAVING Filed Sept. 7, 1950 4 Shets-Sheet s A ttorneyg May 19, 1953 T. HINDLE'. 2,633,941

LOOM FOR WEAVING Filed Sept. 7, 1950 4 Sheets-Sheet 4 Inventor Attorneys Patented May 19, 1953 Loo EORWEAvING .Y

a 'mffar" m ckbmhilsngl nai Application" September 1950'," Serial No. 183,541

This invention' relates to' looms ifo'r -fweaving' .and more particnlarly to'dmprovements" ldom stopf'motions.*--" The specification of Tap'pli'cation- 'Ser'ial'fNd; 309791 filed June 3 19l8',now Patent No'. 25513492; granted Maj/*1, 1951, describes improved means for driving, stopping "and *in' certain 'circum stances reversing a--lom-,- wherein a primary -tog= gle serves to retain the startinghandle whenthis ispnlled into its'=run positic'nto startthe loom,- az'id "a{secondary*-toggle is adapted to be tripped by antorriatie means, this-secondary toggle" then collapsing-inan unward direction underth' action; of 'a-powerf ul spring acting "to disconnectthe di'i-ving'means and; apply a friction-brake-whereby' the loom; is {stopped with exceptional 'promptness, the startinghandle and attached-control rod-remaining' -stationaryduring such-tripping action; therebyavoiding the delay which *theirinertia would otherwise cause." r The aforesaid patent also describes certain purely mechanicalmeans-whereby the said See-.- OndQ l'Y-POg'gIQ may be tripped automatically "so; as tq stop the Icom'fiinjthga above-manneri should the' shutfle fail to *"enter the-box irr the: normal manner, or should the Weft fail during theshut tles-fii'ght across the- 19cm; or in-the casewf' a diep=box loomsheuld "a'shuttle bozi itsi'changing: movementw -ifIhespecificati0n of my applicationserial No. 185;:290; filed September 21,1950, describes a cweft detector which is sensitiveqtoj the} tensiongof :the wefitsdur w h mlatt r and major partr f th shnttlas rassage across the leo-m and which acts, w gqea u ies l t e ll q r hew -etc closeaan: electric" switch 'Ihis weft-controlled switch is pr f 1y; emp gyed to maintain an electric --cir-. 1c wonld otherwise-whe interrupted;: h I lrincipaLobject o f-the present. invention t provide improyed means forutripping and lling thetrippihg of the secondary toggle d in the a or aid. at tiwh rebyflth lag between the detection of an initiating v I and theresultantstoppage of ,thejl'o'd'mfis appreciably diminished in comparisonlwith the mechanicaltripping means "describ'ed""'in.fthat specification; and whereby the secondary toggle may be trippedin immediate response'to "initiating -faiilt at -any time in' the slaycrankshafts' revolution irrespective of'the pbsitio "mavemnt bf"the slav atthat time mWhile the"inventionisparticnlarl pplia leto-andiis herein descr'ibedfiiniFconnection with me ddiib-le rtogg'le'-:starting: handle inechafiism de; scribed- 2in:the-:aforesaidu patent; it may readily" "A'ccordin'gt'o the present inventio'n,;ane1ect I September:24,""1949' i' 6-Chili-rinse (01.139-345) be adapted-to 'efie'cvautomati'c tripping of 1 any form ofholding-on device fitted to loom starting handles, such as a catch, alatch, a. notch era? sir'r'ipleitoggle'or'cam lock.

solenoid drielectro magnet; hereinafterrefe'rr d' lidT'ES*thQtIiPSOlGIlOid co-pacts withthe loo'mjs starting-and stopping controlling? means in such manner that-the energising circuitcf the-trip solenoid must first "be completed to enable the loom-'tobestarted, and mustbe maintazinednninterriiptedfall, the-time the loom is; running, and-if for any-*reason" the'circuit is not so maintained But-is' interrupted'jby' one-or more controlling switches in consequence of abnormal conditionsaifising'; either" in the m or any cfflitsjparts, or-in the weftand/cr, warp yarn and/or woven cloth,-"or" if the energising current supply yfail s then thetrip-solenoid is de-energisedan a result theloom isstopped automatically. When-thej trip-solenoid is energised by completion o f its 'circ'uit,- the resultant magnetiq; pull; (:ii'awsinWhESOlBIlOid plunger and loads up one r m-more springs; "thereby providing a store of enrgii-Which-pwhen released by automatically eontrolledinterruption of the energising-cirqu amply powerful *enough to trip the starting-- handles-holding-on device. 'Ihe invention is} illustrated *in andqwilr be described with-reference1to the accompanying drawingsfinwhichz" 1 '1. 'f

l' is agfrontelevation; partly in section showingthetripsolenoid adapted to :controlith'e' secondaryv toggle of. the double-toggle starting handle-linkage described in the aforesaid patent, the'*'solenoi'd plunger being "shown "retractedfin its normal energised p csition; and i the starting- Kindle" linkageiii' its normal runningpo fl eanespoads with Fig. 1, lent she as e w n eein d a ly lQWie-si Qemtsiwfim o e trip- 01mm; and cQp egn ta Qm ti 's pa o theelqom; is

*F g ss sectipnthrough parts' of ea loom:

iipwiie the m han cal a tuat o cfltheusw tches. emp oy dit h cpnt lmhe trip-s l n id shuttlezprotectiom V- a 'c Fig. 4A is a timing diagram relating t Figs 4 F173;. 5' is an electric circuit diagrani'providingq 3 shuttle protection and loom stoppage consequent upon weft failure;

Fig. A is a timing diagram relating to Fig. 5;

Fig. 6 is an electric circuit diagram which is a modification of Fig. 5.

In the form of the invention illustrated in Figs. 1 and 2, the trip solenoid IS, with its axis horizontal, ismounted on the inside face of the loom end-frame F, in close proximity to the startinghandle linkage which is mounted outside the endframe. The starting-handle linkage illustrated is identical with that described in specification of application Serial No. 30,791, and comprise a starting-handle or lever I, with its top end linked to the starting-rod 2, which extends the full width of the front-rest R. The staitingelever I is pivoted on the pin 3 carried in the bracket 4 bolted to the outside of end-frame F, and is provided with a short arm or lug drilled for the linkage pin w, and also with a toe Ia, which latter finally abuts against an adjustable stop-screw ia, asthe starting-lever is swung over into its run" position, shown, in solid lines in Fig. i.

The starting-lever I is connected by the compound compression links 5 and 6, pivotally connected by linkage pins w, a: and y, to the top'e'nd of the verticalarm 'I of a bell-crank lever piveted at C on the end-frame F., The setting of the secondary toggle links 5 and 6 is finely adjustable by means of a stop-screw 60 and due to their own weight, these links tend to assume the locked or approximately straight-line position shown by'both'full anddotted lines in Fig. 1,

IDuring normal manual operation of the starting-lever, the secondary toggle links 5 and 6 act as a rigid compression link, which in combina tion with the short radius arm carrying thepin w, constitutes a primary toggle serving to lock the-startingdever I in its frun position, as defined bythetoe Ia bearing against stop-screw 4c.

The horizontal arm la of the bell-crank lever is connected by a pin a to the vertical tension link 8, by which the movement of the bell crank lever i transmitted to control the loom driving means, such as a iriction-clutchin combination with the loom stopping means, which is a powerful friction-brake. This brake isapplied by a and theeffect of raising the pin 2 and link 8 is to release the brake and then engage the clutch, all against the increasing force e ertedby the said brake spring, in the manner generally as described in specification of'applica'tion Serial No. 30,791, the continuous action of, the'brake spring tending to disengage the clutch and apply the'brake being resisted by the doubletoggle look, so long as the loom continues weaving in a normal manner.

The trip-solenoid, which is part of the present invention, may be of any suitable construction, such as that shown in Figs. 1 and 2, in which an iron casing Iii encloses the energising coil II. The soft iron plunger [2 is slidablysup'ported in a non-magnetic bush I3 and by the non-magnetic stud 14, which slides in the iron pole-piece I5. Acompression spring I6 located between the end-cap Na and the collar I 8 on a stud I4 acts to propel the plunger I2 to the right, as shown in Fig. 2, when the coil II is de-energised, suchoutward movement being limited by the collar i8 then bearing against the'inner face of the polepiece I5. .The spring I 6 forcibly retains the plunger I2 in such position so long as'the coil I I .isnot energised.

When the coil II is energised, however, as shown in Fig. l, the plunger I2 is electro-magneti- 4 cally retracted to the left, at the same time further compressing the spring I 6, the plunger movement being limited by the end Ma of the stud I4 finally abutting against the fixed stop H, in such manner as to leave an appreciable air-gap between the inner end of the plunger and the polepiece I5. In such energised condition, the hammer 12a of the retracted plunger presents no obstruction to the'movement of the arm 9, which is an extension of the secondary toggle link 6. When the trip-solenoid is energised, therefore; the starting-rod 2 and the starting-lever I may be moved in a normal manner from the stop" position, indicated by dotted lines, to the run position shown by solid lines, thereby starting the loom. The corresponding positions of the primary and secondary toggle links, also of the bellcrank lever and link 8, are similarly indicated in Fig. 1. During such starting-lever movement, the arm 9 closely approaches the hammer I2a of the retracted plunger I2, as shown in Fig. 1. t

In order to illustrate the action, an electric battery I9 and a simple switch 20 are depicted in Figs. 1 and 2 for controlling the solenoid. If th e switch 20 is closed, as shown in Fig. 1, the solenoid is energised and the plunger retracted, thereby further compressing spring I6. If now the switch is opened to interrupt thesolenoid circuit, the magnetic flux'collapsesandthe spring I6 propels the plunger I2 t0 the right at a suitable velocity so that it strikes a hammer blow on the arm 9, with the result, as shown in Fig. 2, that the secondary toggle, comprising the links 5 and 6, is tripped and instantly collapses in an upward direction'under the compressive force continuously exerted by the aforesaid brake-spring.

As the secondary toggle is tripped in the above manner, the brake-spring acts to disengage the clutch and apply the brake, thereby effecting very prompt stoppage of the loom as describedin the aforesaidpatent.

During such tripping action, the starting-rod 2 and starting-lever I both remain stationary in their run positions, thereby avoiding the timelag which their appreciable inertia would otherwise cause. 7 I 7 After the secondary toggle has been tripped by the trip-solenoid in the above manner, the toggle may be re-set by the simple manual return of the starting-rod 2 and lever I totheir stop-positions (shown in dotted lines in Fig. 1) inreadiness for re-startin'g theloom.

If the fault which initiated the automatic stoppage has been duly remedied. so that the solenoid is again energised, and its plunger consequently retracted to the-left, the starting-lever may be moved to its run position to re-start theloom in the normal manner. On the other hand, if for any reason the solenoid is not so re-energised, the spring I6 forcibly retains the plunger I2 in its tripping position, in which case its hammerend. shown in'dotted lines at I2b in Fig. 1, obstructs the arm 9, with the result that the secondary toggle'is again tripped before the starting-lever I and link 8 have beenmoved 'suihciently to engage the friction-clutch, or otherdriving means, thus preventing the loom from being re-started until the trip-solenoid has been re-energised.

In applying the trip-solenoid to effect automatic stoppage of a loom in-the event of the shuttle failing to enter the opposite box within the allotted time, customarily known as shuttleprotection, the trip-solenoid is placed underthe joint control of two switches, hereinafter referred 53 t'zisrespectively;rasttheshuttle tryrswitchrand the shuttleeswitcha: 7 p. p ueflh'eeshuttle stry-switch .is actuated .from :any. convenientrimovingz;part.of. the; loom, but preferablyzby means of acamrevolving at slay crankshaftsspeedrrthe profilesof :the. cam being arranged'izo close the'shuttle try-switch.shortly befozeatheshuttle isiipicked and toop'en it just. after the. time when theishuttleis normally due to arriveiinstheioppositebox. :E Ihe shuttle-sWitcH1may-The actuatediby me-, chanical linkage from the slay stop-rod, in such manner' that lthe shuttle-switch is closed by a shuttle'ientering' into or' remaining in -the box ateither side ofthe loom, but is open when both boxes are empty,='as occurs while the shuttle is iniiight across 'the loom, also when the weaver Withdraws the shuttle from abox with the loom Referringto Fig;'3, which merely shows those paramea' loom necessary to illustrate suitable iiiechanicalactuation of the electric switches employed-"to co'n'trol'the trip-solenoid, the shuttle try-switch 2 his-mounted on the back-rail 22, and isactuated by follower-lever '23, provided with-adjustable screw 23bjto engage the switch plungeril'x. Aspring 26 holds a follower-bowl 23d mounted" on theffollowerdever 23 against the profileo f-a camflfwhich revolves with the slay cranlishaft15ii The shuttle try-switch 2| is slf-op'e'iiingbyreason-of its own spring (not shown); and is *closed by screw 23b as the cam iv olves'and' displaces bowl 23a to the right.

Ihe'"shuttle switch 21 is mounted on the frontfail ifof' theloomand' is actuated by'a lever 29, which is provided with an adjustable screw 1 9a tobngage the switch" plunger 21:2. The lever 29fisconfie'cted by a'link 30 toalever 3| secured wye sla'y Stop-"rod 32, which is a simple rockershaf-tlfcompletely' devoid'fof dagger-blades or the lilie 'and is provided; at each endywith a finger lverf33-"adapted' to 'bear on the box-swell 34, tidntro lled'by'the shuttle as in the usual manner. t d"spring'is indicated 'at 36, but 'ay-be duplicated and applied in any convenient manner. {lhebhuttl e switch 21 is self-opening by "reason of its 'own"sprin'g (not shown) andlis clo s'dby ash'uttle'entering dr'remaining the b6)"; at eitherfside of 'the looml When both-boxes. are emp y; the shuttle-switch is open? shown 1 Fig. fl, the shuttle try-switch fl; i 'ojmectd parallel Withthe *shuttle-switch' '21 and then iriseiieswith' the energisingtrcoil lTof tfiflsolr oid. electric "condenser 40. is 'con'nctd in parallelwitn the switches in or deer to quench the inductive spark'when the solenoid cir c uit i interrupted? r pmbe oraux; ili switches ll: ma be'ineiuqed-m the-sole: hem circuiti j Theseswitche's are norma y closed,

t are adapted to be oj jenedj as a direct ecu"- s n .Q ab mie T' o dit n arising t r i t 16011; or anyofits parts; or in'the weft-"or I m 3 the j-"i lq lt afi u nm 'oanydneiqch eau me swi h s rvih'g' to interrupt the trip-solenoid circuit and censq ue wq .efie t. prom t. emer e? th nig'i ihj'wh h is earning diagram based ononerevolution'bfthe looih 'crankshjaftfthe assumed directidn of rotationbeing'a's shown 'by the arrow, 3 represents" the front-centre aiid'lb the back-centre, the pick oc'cursatjabout pqand the shuttle normally enters the opposite box' a't e? fB'o'th boxewhe'rerores are'empty forthie er-1 B'sp td-"t'; duri'ng wmch period thshuttle swit'ch t thes-open; rlTheirshiittle try-switch? 21 'closesiat about shortly :before the pickyand remains closed; until it :opens' at .io,.:just'.after the shuttle is'rnormall'y 'duezto arrive in the-opposite boxand CIOSGQShUttIB -SWHCII211. r, 1' Y 'If the? shuttle :tarrives-inthe boxiwithin the allotted-mime; that. is, before gthe shuttle try-1' switch opensz'atz'o', the circuit of the trip solenoid is'rm'ainta ined throughoutthe cycle, first by the shuttle try-switch'=and'-.then by the shuttleswitch;.;with*overlap as one switch takes .over irom== the other, so "that the loom continues weaving. a j fphowever, 'due to mischance, the shuttle has not arrived the box and closed the shuttleswitch 2 1=iwhen the shuttle try-switch 2i opens aiioi then the -ciic'uit' of the trip-solenoid is im-x mediately:interrupted, and the loom is stopped very-promptly with slay about half-wayin its forward'swing', so avoiding all possibility of damage due'toxatrapped.shuttlel 'i After such automatic stoppage, the act 'of manually in's'erting'th'e"shuttle'into the box closes the shuttle switch 21," and re-energisesthe trip-'- sol'noid; thereby enabling the loom to bere-i' Referring to Figs. 3; '4- and Ad, the cam 24,. shown only in Fig; 3, which actuates'the shuttletry switch' 2|, "may bereadilyuadjusted around shaft 25to set'the opening-point 0 so as to provide'for' a 'reasonable'margin of delayv in the shuttles'arrival in the box, combined with'very adequate shuttle protection. 1 f -The stop-rod 32, shown in Fig. 3, extending along the slaybetween'the boxes at each end andniay-beomitted and substituted by two relatively' "short shafts" eachhaving secured to it one feeler lever 33 and onelever 3|. In this modification, the shuttle-switch '21 is duplicated;;there then'b'eing 'one such switch for each box; These. duplicate shuttle-switches,=21 and 21a are connec'ted inparallel'a's indicated by dotted lines in Fig. 4. -The ope'ratioriisiotherwise unchanged, as the shuttlesfnorm'al. arrival closes either the shuttle-switch"?! or the shuttle-switch 21a, ac-

cording to" whichend the shuttle is travelling, and thereby maintains "the solenoid" circuit when. the shuttle try-switch 2| opens at o. 'Iii'a' further modification, the duplicate shuttle-switches 21 and 21a maybe 'mounted'o'n the sIayateach end and actuated directly by. their respective box-swells. In a still further -modi-. fication the'shuttle switches maybe mounted on thesliuttle-b'oxes and 'actuatedfinore or less diitly by th'shuttle, as is particularly-convenient in the case of a loomjfitted' with pneumatic pi'ck-' in'gj'which necessitates enclosed shuttle-boxes;

flhe aforesaid patent describes a mechanically aetuat a eemre welft 'fork by" means of p which, in the absence of weft in the shed during the-latter partoi 'the'shuttles passage, a pawl is lowered into the path of a 'vertical lever scured'to a sleeve fitted loosely on the slay stoprod, s o'preventing he s ee e ,-.f 9e rock n along it fee-s m when this rocks..duetothe shuttlels normal, entry into'the box. When the sleeveislocked and held stationary inthis manner, an escapeinent spring, which normally. causes the sleeve to rock with'the stop-rod,, acts toprevent; damage, to the parts. suchwweft-forlcmechanism may be readily adaptedtooperate in combination with the tripsolenoid and controlling switches hereinbefore describ'ed sosasto cause. the loom to stop .on pick!.-"-if-ithe wet f ails :during the;shuttles. passage,

Referring to :Fig. 3A, whichshows the position of the relevant parts .at the :instant vof the shuttle s normal .arrival .in the box, {the weft having run out or @broken during .the :shuttles passage, the weft-fork 4!, in the absenceofweft-support, has falleniinto the usual groovezinthe slay, and haslowered thepawl 42 into position toengage andlobstruct the movementof the top.end.4'3 of a .verticalleverdfi which is securedto the sleeve 45.fitted looselylon the stop-rod 3.2.

Theescapement spring :48 normally holds the arm.46, alsosecure'cl to the sleeve-:45, incontact with the arm Ill, which is secured to the stop-rod 32. In this'arrangement, :the lever-3|, .which in. the arrangement shown in Fig.3, is secured directly to the-stop-rod, lisiinstead secured to the spring-driven. sleeve l5,'so,that the'closure of the shuttle-switch Tim the shuttleentering the'box and-rocking the stop-rod is made furtherconditional upon the weft-supporting the weft-fork and thereby permitting-sleeve-iietorock with the stop-rod.

Theoper-ationiis-as follows: .If the Weft-fork M :receivesthe necessarysupport from the weft, the paW1A2.isthereby-supported:above and clear of the path of the vertical lever 45. If and aspthe shuttle. enters the box in the normal manner, and I'OGkSEt'hE stop-rod,,the sleeve also. rocks, and the lever .-'3l "acts through the glinkje to close the shuttle-switch .27, before zthe shuttle try-switch 'Mopens; at o, showninFig. 4A, so that the loom continues weaving. If, however, as is shown by Fig. 3A, the weft fails, the.weft-fork 4l falls and lowers its pawl .42 to obstruct the top end 43 of thevertical-lever .44, together with the sleeve 45 and attached arm146, andalso, the lever. 3|. Even thoughthe-shuttle enters the box in the;normal manner and! rocks the stop-rod, :the sleeve is prevented from rocking, and consequently vthe shuttle-switch :27 .is notclosed by theshuttles normal arrivaLand Whenthe shuttle try-switch 2| opens attheyappointed:time, the trip-solenoid is interrupted thereby stoppingrthe loom, for weft repair,=. with. the slay-about halfway in. itsforward swing. .When'the stop-rod rocks-within the stationary sleeve in thismannenthe arms 46 and 47 separateas shown,:thereby further compressing spring 48.

The weft detectors, or weft-controlledswitches,

described in application Serial No. 185,990 may be employedtocontrohthe circuit ofthe trip-sole,- noid: hereinbefore described, so as'toeifect prompt stoppage of the loom ifthe weftpfails while the shuttle is:in;fiight-across the loom. Two such weft :detectors, hereinafter referred to as the WGftr-SVitChtES, are employed, one for each direction ofpicking, in combination .witha cameactuatedyyefttry-switch, all three switches being connected in parallel-and then in series with the basimshutt1e;protection circuit shown in Fig. 4. The-weft.- try-switch 3B is preferably mounted and operated exactly as-the shuttle try-switch 2| in Fig. .3, the cam; profile being modifiedto suit the working requirements.

,This combination is shown by the electric circuit-'diag1 am,,Fig. ,5, in which the trip-solenoid coil ii, the shuttle try-switch 2|, the shuttle switches21 and Zlaythe condenser 45) and the optional auxiliary switches-ii all correspond with Fig.4. The right and left-hand weft-switches, 31 and 37a, are "connected in parallel-with the weft try-switch. As shown by the timing diagram,- -Fig'. -5A,- the weft try-switch 38- opens-at c shortly after the shuttle has entered the she'd, by which time: the weft has. normally-looped round the adjacent weft detector pin .of the aforesaid application Serial No. 185,990 and closed its weft-. switch, and closes again at about .0 (as .or just after the shuttle .normally .enters :the opposite box. During the interval fromohto 0 while :the weft try-switch is .open, the wefteswitch ,at the picking side hasthedutyof maintaining the tripsolenoidcircuit, as :is indicated in Fig. 5, by the arrowdiolding the weft-switch 311a closed.

If the weft runs outor breaks,.or for anyreason does not -close the appropriate -.weftswitch :and keep it closed, thenthe itrip-solenoid .circuit is interrupted and the loom stepson pick.

Referring to Fig.5, when the loom stops automatically due to' weft failure, the shuttle wilheem erally arrive in its :box after the slay has stopped, with the shed more or :less fully iopen. The weaver will usually .replace the .empty or ;-faulty shuttle with a full one, which he will pass through the stationary shed and insert ;into .the box-after withdrawing therefrom the faulty shuttle. in order to i'eeenergise thetrip-solenoidpreparatory to re-starting the iloom, the weaver .must hOld .0 arrangethe weft thread extending through the shed so that isclosesthe weft switch -a.t-.that side from which the faulty shuttle was picked. ;In practice, "this requirement is Ob ectionable, par.- ticularlyi-in the case of a wide 1oom,1h,ence;it is often preferred to adapt-the control circuit ,to permit the loom, after alweft stoppage, to herestartedwithoutthe necessity for one of the-.Weft-.

switches to be held closedduring the first forward swingof the slay. While this throws .upon the weaver responsibility for the ,weft being fcomplete in. the shed before restarting the loom after :a weftstoppage, it'is a practicalconvenience.

One such modification ,is shown in- Fig. 6, wherein the two weft-switches 3"! and 31a are connected in paralleland thengin series :with the shuttle try-switch ,2 l This leg ,of the circuit ,is connected in parallelwiththe shuttleswit c hes,.;2:1 and 21a .andltheweft tryeswitch r38. jlfhese parallel legs are in turn.- connectedin series with the trip-solenoid coil ll. Thecondenserflliis connected as before to quench the inductive spar-k when the solenoid circuit iszinterrupted.

In this .modification, after a weft stoppage and the weaver taking the necessary action ,to make good thefaulty weftin the openshed, the act of inserting the new-shuttle into the ,box closes the-shuttle-switchfll or 3 21c) whichenergises the trip-solenoid although both weftswitches .are open, thereby permitting the loom to be re-started. After the first forward swing of the slay, of course, theweft stop-motionrenews itsfunction.

Under normal running conditions when :the, slay is about 1 its back-centre position, i as is ,indicated by the diagrammatically. depicted shuttle tiff-:SWIltCh 2i and Wefttry-switch 38 in Fig. 6, the shuttle is in flight across theloom, and the trip-solenoid is then normally maintained by oneof the weft-switchesheld closed by thewe'ft being laid in the shed by the,movi ngshuttle, as is indicatedbythearrow holding weftiswitch 31a closed. l v

With the control circuits shown in Figs. Sand 6, the completeabsen ce of weft inthe moving shuttle is-instantly detected whenthe-wefttry- SWltCh'BB opens very shortly after the pick, in

which case the loom stops with the slayat or about its back-centre position -and -.w ith the empty-shed fullympen. -Weftfai-lure may occun howev and L be ns a tly i-ide ected a a y time..-dur,ine-th zrncri d co m ncin w th the opening of the weft try-switch and ending with the shuttles normal arrival in the opposite box. At the latest, therefore, the loom is stopped due to weft failure with the slay only about halfway in its forward swing, which coincides with the stoppage position resulting from non-arrival of the shuttle.

Referring to Figs. and 6, the weft stop-motion feature may be put out of action, if so desired, by simple closure of a parallel hand-switch 39, without impairing the shuttle protection.

Still referring to Figs. 5 and 6, any number of auxiliary switches 41 may be included in the solenoid circuit, such switches being normally closed but adapted to be opened as a direct consequence of abnormal conditions arising either in the loom or any of its parts, or in the warp yarn or in the woven cloth, the opening of any one of these auxiliary switches serving to interrupt the solenoid circuit and thereby to effect prompt stoppage of the loom. As an example of the use of the auxiliary switches 4|, the displacement due to overload of a safety-escapement device fitted to the linkage operating the shuttle boxes on a drop-box loom may readily be adapted to open an auxiliary switch, such as indicated at 4! in Figs. 4, 5, and 6, for the purpose of stopping the loom promptly and well bu fore the next picking impulse,-in the event of the moving boxes being jammed by a misplaced shuttle or picker.

The trip-solenoid H is preferably designed to have a final air-gap between the plunger [2 and pole-piece equal in length to from onesixth to one-quarter of the effective plunger stroke, which provision limits the final magnetic flux and ensures very rapid release of the plunger, under the propelling force of its spring, when the solenoid circuit is interrupted.

I claim:

1. In a stop motion for a loom having a starting rod, and a member for actuation by said rod to control the starting and stopping of the loom, a device for holding said member in running position and trippable to release said member for movement to stopping position, a solenoid active when deenergized to trip said holding device, a circuit for energizing said solenoid, a switch for closing said circuit to render said solenoid inactive relatively to said holding device and thereby condition said member for movement into starting position and for holding said circuit closed and said solenoid energized for continued running of the loom, and a controlling switch in said circuit operative in response to an abnormal condition in a part of the loom to open said circuit and de-energize said solenoid and thereby condition said solenoid to trip said holding device.

2. In a stop motion for a loom as defined in claim 1, wherein said holding device for said member comprises a toggle which when straight- 10 ened provides an operating connection between said member and starting rod and operative, while said solenoid is energized to transmit motion from said member to said rod but when flexed renders said connection inoperative while said solenoid is de-energized.

3. In a stop motion for a loom as defined in claim 1, including a plunger which is retracted when said solenoid is energized, and a spring in which energy is stored by the retraction of the plunger and is operative to move the plunger into tripping engagement with said holding device to release said member.

4. In a stop motion for a loom as defined in claim 1, including a plunger which is retracted from said holding device while said solenoid is energized to condition said member to start the loom and for normal running of the loom, and a spring which is compressed when said plunger is retracted and which is operative to impart a hammer blow to said holding device to trip it and thereby release said member to stop the loom when said solenoid is de-energized.

5. In a stop motion for a loom as defined in claim 1, wherein said holding device comprises a toggle between said member and starting rod for conditioning said member for operation by the starting rod to start and stop the loom while said solenoid is energized and for rendering said member inactive to start the loom while said solenoid is de-energized.

6. In a stop motion for a loom having a starting rod and a member for actuating said rod, the combination of a holding device for said member, a solenoid for tripping said holding device, an energizing circuit for said solenoid, controlling switches in said circuit, a try-switch in said circuit in parallel with the controlling switches, and a cam for operating the try-switch and rotating at slay crank shaft speed, the profile of said cam being such as to maintain the tryswitch closed during a predetermined period of the loom cycle, and each controlling switch being operated to close before opening of the tryswitch in the absence of an abnormal condition in any part of the loom to influence a controlling switch to maintain it open.

THOMAS HINDLE.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 905,131 Bacon Dec. 1, 1908 1,080,091 Wintermayr Dec. 2, 1913 1,790,335 Weissenborn Jan. 27, 1931 2,442,178 Robb May 25, 1948 2,455,504 Kronoff et al Dec. 7, 1948 2,465,829 Ancet Mar. 29, 1949 2,499,887 Sullivan et a1 Mar. 7, 1950 2,556,785 Abbott June 12, 1951

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