US1926604A - Sewing machine - Google Patents

Description

1952 2 Sheets-Sheet 1 Sept. 12, 1933. -v. G. TERRY SEWING MACHINE Filed March 12.

lllll Il.

Witneff Uhm. Y.' lson sept. 12, 1933. v G. TERRY 1,926,604

SEWING MACHINE Filed March l2, 1932 2 Sheets-Sheet 2 110 111 113 3V- O 11i-lm 11; 120/ 3 l l 3 110 116 116 120 Q 36/ m H` I \122 111 1.1111; y@ 110 36 I Fly Wz'tzff I l'fm/mig @fw/.9.7.1 Olson M y /f Mm Al/11%' Va? M1.

Y bringing the machineto rest.

Paieniedssepililz,1933s; y 'i 31,926,604 i Q f SE'WDSTG MACHINE* n; d

Vincent G.' Terry,A Beverly, Mass., Aassignor` tolti-l L United Shoe Machinery lCorpmation, Patersony o f N, J., a corporation of New Jersey p o applicati@ Marcela, 193,2. serial Nq. "598,458

' 4 claims. (clone- 219i f The present. invention relates to safety devices for'driving' and stopping mechanisms; 'particularly intended'for use in shoe sewingmachines, in' which high and low` speed driving mechanisms 'for the :sewing cainnslfiaft of the-fma'chine are provided, the-high` speedmechanismbeing in operationduring `the sewing of a seam, and 'the' Y low speed mechanism beingthrown into operation' atr the end' ofthe seam, rst to reduce .the speed of the driving shaft of the machine, and then to drive the shaft at 'a low speedubefo're o In making certain adjustments, on 4a power drivenl sewing machine,v it frequently islnecessary to turn the main sewing cam shaft'` of the machine by handV to a position in `'which the parts to be adjustedrnaymost easily be manipulated. When the sewing shaft is driven through high and low-speed driving and stopping mechanisms.,- and particularly Where a positive stopping device is employed-to automatically bring the sewing shaft .p to rest at adenite point, the sewing shaft Vvide a safety 'device on `a high and.l` lowV speed driving and stopping mechanismfora sewingma-v v chineg which may be manually shifted froma t cannot be turned freely until' certain parts'- of the driving and stoppingvmechanismare disconnected to :release the sewing shaft.` In thestopping .mechanism hereinafter described,'to which the present invention has beenapplied, allow speed friction clutch not under Vthe direct control' of the operator is provided whichmust, in order not to endanger the operator in making adjustments, be rendered inoperative.A The sewingshaft of the machine is also locked against rotation by a positive stoppinglever cooperating with a cam on the sewing shaft, which'lever acts against pro'- .iections on the 'cam to .bring the machine to rest is operated during sewing through'ahigh speed fclutch actuated by a foot treadle to `drive the ping lever being rendered inoperative-.by connections tothe foottreadle Awhile the high speed clutch is actuatedto drive'the sewing shaft,-y

The object. of the Vpresent Vinventionjis to proposition in which" the' sewing machine may be "operated in the ordinary.way, to asafeposition "under `'powerwhile adjustments to the stitchforming device's'of thejmachineare being made.

positive stopping leve'rlY The illustrated embodiment ofthe; inventionv comprises a 'manually f without: dange at adeiinitepoint in the rotation ofthe sewing shaft afterothe seam is completed.l The machine With the above object in view,'therefo`re, v the"` present invention consistsrof theprovision `in a 'V 'Y y Vdriving and stopping mechanism havinghigh and' Y low speed clutches;y of aV manually operable safety device forpreventing operation 'ofthe high speed clutch Aby -the clutch controlling treadlewhile 'permitting control of the low speed clutch from shaft by hand." Preferablyalso the safety'device' is', arranged to permitvcont'rolby the treadle'of the vstopping liever for positivelyfb'ringing the 65`,

machine to rest and lockingit in a.' deiinite'posi- 'tion so that the treadle 'after y'being rendered inoperative toactuate .thehig'h speed'clutch maybe utilized; toA V release the i sewing shaftv from the shiftable block pivotedton theconnections :be:-

Vthe treadletoa'llow free rotation of the sewingtween "the driving 'andstopping?mechanismand i! y 'thetreadle for movement` toi'fzardA and away from a' position which the shiftableblo'ck .may Y enclutch.` `By shifting` the lolockv from' the position 7'5 .gageactuatinggconnections" for the highspee'd infwhichit engagesfthe high .speed clutchconj I nections, actuation of fthe lowV speedfriction clutch may befl preve'nt'ed` and 'the posithese conditions', actuated `andk the .low speed freely turned` b ylV hand; to any, desired 'position 1f .Qf an acsidenial applicaigg. 0f

.Y eatures'fof the .present 'invention will be clearly understodgfrom/an inspection of the Y accompanying dr awingsinwhich Fig. `1`is a machineA from alcontinuouslyf rotating j driving shaft, the low speed clutch andthe positive stopview in frontelevation of ashoe sewing machine -tive stopping'` `device vmay be disengaged fromv Vthestopping cam *on the cam shaft v)oy 1 movement of thetreadleto.the` positionin Whichlit Y normally `actuates thezhighfspee'dfriction clutch.`

AInasmuch. as thehighfspeedgvclutch'is not, under 'f having 4a driving and-stoppingmechanism With y device 5 as fapplied ,to :the g Iillustrated machine;

the' ,preferred f orrnjof `the present inventionapo n *plied thereto,;o Fig.o.2is a sectional'view on' an enf` ,lafgeescae` taken ihrouglifhe linea/2 of Fig- ,.ure1; .and-Fig.;3 is a-sectionalV-viewtaken along :.Theu-machineillustrated in-thedrawingsjis an L outsole .'shoeiA sewing machine; l morei fully illus- 625,231*granted April19,=.1927 t'to Laurence E; t

#-Topham, and accordingly,v solmuch onlyv of "the machine has" been' illustrated.' in -the Vdrawings Y' o o A ,o v 'dated;'and` describedV inthe U. etaient No; v1,- 105' in which'the sewing shaft of the machine may be rotated `by handl but preventedfrom"rotation Vof the machine is Aindicated at 2`, the needle at 4 the avvl at 6, and thepresser foot at 8. The machineis driven from a` continuously rotating' power vdriven countershaft 10 mounted parallel to' the front of the machine in bearings carried by `yokes 12 secured to the machine base.` The shaft 1 0 maybe connected to a series of other machines fas in; a shoe repair outt, The'shaft 10; being driven from a single prime moverwouldenecessarily cause the inconvenience of stopping all thee machines in order to safeguard any one machine by bringing theprime mover to rest; The stitchw forming devices* of the'machineV are/operated the sewing operation, is connected to the countershaft 10 to rotate at high speed by a high speed friction` clutch ycarried at the left hand end ot,

the sewing shaft 14. TheseWing shaft 14 is alsodriven by a 10W speed clutch rendered operative vupon -disconnecting l the high speed'` and driving the shaftin a forward direction to astoplping .pcisition and with mechanism "forpositively stoppingmthe shaftin a predetermined definite position". f

, 14' at high speed during normal sevving` operagtionv of the machine' consists of `agdriver'i clutch' Amember and hand Wheel V2(11ixed to the yshaft Maud a drivinglutch Imember 22 loosely mountedvv on they `sh'aitwand movable longitudinally A of the shaft into and pout "of jlengagement with the drivenclutchf member; Thewdrivingl cluteh memberis formed 'with' afperipheral groove to receive a .belt "24fjo`r connectingsaid V'member withapulley 26 secured to Ythelpovver- "driven counter-shaft 10. AThe 'engagement of 4tliedriving member of the 'clutchvvith the driven memberis controlled by abellcrank128 pivote'dwo'n v"afstud 3 0, the( upper forked end ofthe vertically "extending armof which-embraces the hub of the driving Vvclutch memberfandV carries a pair of piinvzytedl blocks 32 engagingjin a grooveefin Y fthe'j hub of thel driving' clutch; member; Upon thestudlBO isalso pivcntecll an"a rm .36 havinga yielding connection Withf the f horizontally extending armjof the bell crank 28." The end ofv the arm v36 @is formedjivith` a-lateral projection to'be operated by a treadle rod 381pivotallyconnectedatl its` upper e'ndvvith an arm'i pivotedv ona'shaft 42." :The lower'end of theQrod is con-k Y l (neoted With a` t'readleffle;fulcrumed' in the 4base of the machine'. -'When thetreadleis depressed,

'thelhigh' speed clutch-is actuated throughconnec- `tions comprising :the arm' and `the-,bell crank' jboit '14g-ts more upwardly intqengagment with Vthe bell v crank 66. As soonfas the sevving jshaft 23 Yto drive the ymain sewing shaft atfhighspeed.

rThe treadle -and treadle rod are elevated uponrelease of pressure against the f treadleby theayetion of a coiled spring V46 jeconnectedi1 between` the to 'cause disengagement of the high' speed clutch; #The mainl sew'ing shaftis slowed down' and 'driven at the speed of; operation of the low lspe-ed clutchafter which thelow speed clutchdsauto-V .matically-"released and :the machine broughtfto' restl` The mechanism forfeffectingthis opera- .tionincludes alowspeed. drivingclutch member '50 loosely mounted onithe shaft 14,.,and'a`driven clutch member Y52 havngjla sleevemounted on continuously ldriven theshaft 14 to rotate with the shaft and movable longitudinally ofthe shaft to carry the low speed;

driven Yclutch member intov and out of engagement With the driving clutch member. The driving clutch member isA providedwith spiralA gear teeth 54 meshing with the, te'th'of a spiral gear 56 mounted on awcontinuously rotatinggshat 5 8;

mech,anism' fori controlling the engagementY of pivotedonthe frame 0f the machine and car# rying a cam roll engaging in a cam groove 70 ,in the sleeve of therzclutch memberZ.

The low speed clutch operat'mgmeohanism also comprises `a loclrbolt carrier 72 mounted to slide longitud v"nally' inv suitable guides inthe framev and carrying atits rear end a lockbolt '7e' mounted to slide vertically'in' the lockbolt' carrier fand having its upper end shaped to engage av recess '76 'in' the laterally extendingarm of the bell crank ever 664 Sprin'gUSBurr'ounding the carrier `andfinterposed end" of a sleeve 80, threaded into fthe frame through which sleeve the carrier slides. 'The `lock bolt 'Misfacteduponby a coiled spring'84 which normally tends to force kthe lock bolt upwardly in theo'arrier l2 toengage its upper endinthe-rethe lvv speedvclutch comprises a bell'crank lever i from a main sewing cam-shaft -14which, during" between ra r shoulder onfthe carrierandl the rear cess rof the laterallyextendingarm 66. The'pos ition of the'locl bpltfin the carrier 72--is controlled if through suitable connectionsv from the treadlefrod, jAk l' Y f y rI he connections orcont'rollingthe'position of ythe Vlock v bolt 'le' 'of the lowfspee'd mechanism from .tlietreadle rod comprise a three-armed lew ver 86`pivote`d-On" a stud 88 anda link 930 Aconnecting-fone arm 'of the' leverv'vith the blocksaA cured to the'lower end of the bolt. Another'arm fpdsition to 'maintain une 160k Yboit 74 out' of em gagementf'vvith thereee'ss in the laterally''exlof" thelev'er 86 Vcarries a roll 92 arranged'to 'be l :engaged by the rear end of the arm` 40.* As vsoon asthe treadle `is depressedffar enough' to tendingarmo'f the bell 'crank lever V66 by theV engagement of the roll 92 with the rear end of the larmO. When the treadleis 'released-and the treadlerod ris'allowedto rise', thearmfQ is disengaged fromk the rol-l 92,' 'allowing-the lool;

'nas rotated Asuirlc-ently to 'cauisethe loclg bolt to become aligned with the vrecessj'l inthe bell and `the sleeve of the flow speed' driven 'clutch shaped thatY `a"tthe end of this rotation, the vdriven'clutch memberwill again beldivs'engaged crank 66',v the 'lock boltfentersintothe rece's's, A therebylloldinggV the belljcranl; from 4movement from the driving clutch memberY 5G; tepermit the l sewing shaft to be -broughtto restv Upon the disengagement of-the membersof Vthe slovv' speed clutch, i the, Inainshaft is Iarrested at a n `predee, y :1,926,604 Y 't-ermined vpoint' by positively acting stopping del vices.'

The devices `for positively stopping the iota-- ltion of the main'sh'aft 14 at a predetermined point comprise a stopping lever-94 mounted by trunnion pins 96'onia sleeve 98 looselyv surround fing a shaft 0,`and a cam 102`xe`d tothe sewlisV held out of this'"position by a horizontally ex-v tending arm `of.A the lever which' overlies the third Yarrnv of: the l.tlfiree-a'rrn leverf'86 during the time in'which thetreadle is depressed. The lever 94 is swung-'in a; direction Vtoward thepath'of the cam shoulderupon elevation of vthe treadleyand treadle rod by a coiled spring 106 connectedbetween a horizontal arm of the lever A94,'and a bracket `108 attached to the'l frame` ofthe machine. The cam 102 is solocated on the main shaft 14 that-the shoulder 104on the lcam will strike the'stopping lever 94 *shortly after the` low speed driven clutch member is disengaged from the Vdriving member 50, thus positively bringing the machine torest at a denite point.

Thesafety device, according to the present in-V ventioncomprises means for rendering the actu- Vatingbell-crank 28 for the highV speed clutch inoperative from the treadle 44, so that the lockrbolt '74 of the lowspeed Yclutch mechanism and the stopping lever 94 may be disengaged from l their respectivek operating positions by downward movement of thetreadle without causing vthe machine to be driven at high speed. This device consists of a block V,110 pivotally mounted above the arm 36 on a stud 112 formed vat one end with a clamp member 114 secured tov the treadle lrod 38. In the normal position 4of the block, shown in Fig. 2, downward movement of and actuate the high speed clutch through the lever 28. The blockfll is formedwith any` 01T set forked vportion to surround the treadle rody 38 in one positionA ofthe block, and is movabl out of engagement with the treadle rod by rotation of the block about the stud 112.` The safety block 110 is held in the position to whichv it is adjusted by a spring 116V surroundingthe stud 112- compressed between the blockand a` pair of lock nuts '118 on the Vend of the stud.

To disengage theforked portion of the block' from the treadle rod 38, the block is moved along the stud against the action of thel springuntil` the forked portion of .the block escapes the rod.

The block may then be rotated to a position indicated in the dot-dashlinesof vFigure 3, where gagement with the treadle rod, the treadle may beV depressed toretract the lock bolt "74,l and the positive stopping lever 94v will be disengaged from the shoulder 104 through the connections, previously described, without actuating the high speed clutch. Y l J i y The machine may, therefore, be rendered safe 'offthe invention having'been indicated, andthe the block 110`toitsinoperativeposition and de-v pressing the treadle 44. vAlso, the sewing machine `can not 4be operated vunderv power by-accidental pressure "on the treadley if thesewing shaftremains lin itsfstopped position. Upon-"return` of .L l

the-block` to' the position indicatedin Figure 2, lthe machine may immediately be operated in the usuali way without' causing the inconvenience ,or`

loss :of time which wouldbe necessaryinfdis-l'` 'connectngthemachine-freinr the rotating shutt- 51'() or'iin bringing'the mainfdriving shaft torlresrt before makingadjustmentsfor repairs.' [In order to insure that the `high -speed`v clutch Lwillber released When the treadle rod'rises, the connections between the arm 36 andfthe,'treadle` rodr als "3 compriseY a clamp -bloeli 122 attached to the rod vfor engagement withI thevunderA sideofthe arm 36,- as themachine ofthe Topharn pateid."l

The' nature Vand scope of the several features preferred embodimentof, the invention having beenspecically described, what is claimed isi( 1 A sewing machine having, in combination, stitch-forming devices, a sewingrcam' shaft for 1 f actuating'the stitch-forming devices, a continuously rotating shaft lfor driving the sewing shaft; a high speeddriving mechanism comprising a friction clutch 'for 'connecting 4the sewing shaft i with thedriving shaft, a low speedfdriving and stopping mechanism comprising a lfriction clutch 1,0'5 Y arranged to retard and thendrive the sewing Vshaft at low1speed after the khigh speed driving' clutch is V'actuated to disconnect thesewingshaft from the driving shaft, a treadle,.connections be- 'n i tween the treadle and the driving mechanisms tono actuate the high speed clutch and to render the lowspeed driving'and stopping clutch inoperative while the sewing V,shaft is being driven through the high speed mechanism,"and a manually oper-` ablesafety device for Yrendering the connections 115 to the high speed driving mechanism inoperative iwhile the treadle is moved'to a position which the treadle rod 38, when the` treadle,Vn is dev pressed, causes the block to strike the varrn i renders the low spee'dmechanism inoperative. 2.- A sewing machine having, in combination,

stitch-forming devices, `a sewingcam shaft forfigiv actuatingfthe stitch-forming-devices, a contimli-l vously rotating shaft for .driving the sewing shaft,

Aal high speedrdriving mechanism comprising a friction clutch for connecting the sewing shaft with the driving'shaft, a low speed driving and 125Y stopping mechanism comprisinga friction clutch arranged to retard and then to drive'the sewing. shaft at vlow-,speed `after the high "speedl driving clutch is actuated to disconnect thersewing shaft from the driving shaft, a treadle, arod connected 130 for operating the high speed clutch, and a `shiftable block lmoun'tedon the connecting rod for135 movement toward, and away `from 1a, position; inV vwhich the high speed mechanism will be 'oper-f Y' j ated by engagement of the blockl on the con#- `necting rod with said arm when, the low speed mechanism is rendered inoperative by movement of the treadle. f Y l `3. A sewing machine having, vin combination, stitch-forming devices,l a sewing cam shaft for Vactuating the stitch-forming devices, astopping Vcam provided withV a shoulder on shaft, acontinuously rotatingshaft. for driving y the sewing cam shaft, a high speed driving rnechfv l' i Y, anism comprising a friction clutch for: vconnectv for manual rotation of the sewing` shaft and adjustment of the sewing mechanism by shifting ing the sewingshaftwith the drivingshaft, a

the sewing cam 14,5

prismg a stopping ,leverA vmwenanni; vwith me a stopping Y camY and a friction i clutch arranged to retardA and then-drive the sewing shaft;V at low speed, said stopping lever thereafter being vmoved against saidicam to -positivelyhprevent further-rd?V *tation of` thesewing Shaft; a treadlavconnections vbetvveen the treadle andthe driving mechanisms to actuate.` the r high speedrclutch .andtQ disenfgage VtheA Stepping leverfrom the cam and a man* f a high speed drivingnmechanism comprising a friction ciutch'or connectinggthe sewing shaft with the,V driving shaft, a 10W speed driving and stopping mechanism comprisingfafriction clutch Y arranged to retard and then driveV the sewing shaft `atlow speed after the high speed driving clutchisactuatedto disconnect the sewingshaft Yfrom the drivingshaft, a treadle, a rod connected ,to ;the treadle,xconnections fromitherod to the low speeddrivig mechanismrto render the iow speed driving andA stopping clntch inoperative, an

armfforoperati'ngthe high speed clutch, a. shiftable block mounted-on the 1, connecting. rod-V, for

asY

movementtoward4v andA avgav` 'from a position in which-.the Vhigh speedY mechanism Vwill bel operated byengagementl of the block cn the connectring rod with saidvarm when the W speed mechanism is rendered'inoperative' by movement of -the treadlea"hand1e Carried by theiblockzfor manuallyv changing theposition'of the block, and aspring for maintaining the block in the, position to Whichit has beenmoved. ,v A

Images