US1196939A - Sewing-machine. - Google Patents

Description

l. S. HNCH.

SEWING MACHINE. APPLICATION flu-:u APR. 1, i913. Y

' Patentedept. 5,1916.

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'1. S. FINCH. SEWING MACHINE.

APPLICATION FILED APR. 7. 1913- 1I.. Gu. 1l. t D.. :DU S d. e t D Du t a DI SHEETS-SHEET s,

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a au m M ATTORNEY I J. S FINCH. sEwmG MACHINE. APPLICATION FILED APR. 7.191,3.,

Patented'sepf. 5, .1916.,

4 SHEETS-SHEET 4. j@ '.95 lqa 371/04 103 Jaz COMPANY, A CORPORATION OF NEW JERSEY.

snwINe-MAGHINE- To allwlwm it mayconcern: i c

lBe i 'known that I, JOHN S. FINGH, a citizen ofthe United States, residing at Bridgeport, inthe county of Faireld and State ofConnecticut, have invented certain new and useful Improvements .in Sewing- .Machines, of which the following is aspeciv iication, reference being had therein to the f accompanying drawings.

This invention relates to improvements 1n 'sewing machines `for overcasting loose threads and thread ends by blind-stitching, as in the. finishingof buttonholes, and has l for its/object tofprovid'e anuimproved machine of this type, to which end the various ,operations areV effected through independent 1 chains o fconnections leading direct from themain shaftof the sewing machine'to the functional elements.

--Referringto Ythe drawings, Figure 1 is a view infront side elevation of the present construction, vthe frame or cloth-plate -and bracketarm being shown in section to better illustrate the arrangementI and relative aetion of the parts .carried by and actuated' from the main or driving shaft, the 'looptaker, its guide-bracket and driver being omitted; Fig. 2. an underside view of-.Fig l,

`showing the frame in full lines; v3 a plan viewof .the cloth-plate and the throat the transversely arranged movements of the needle; Fig. 5 .a rear side elevation of the machine, the .frame being broken out te illustrate the mounting of the feed-dog-car* ryingbargFig. 6 a rear end elevation of Fig. 4'; Figs. 7, 8 and 9 front edge, plan and rear edge views, respectively, of the throat orvneedle plate and attached lneedle-guard,-

carrying bar; Fig. lO perspective views ofthe needle-guard-carrying lever and needlel plate 'bracket detached from the throat'- l plate; Fig. lladetail view of the needlevguard-actuating,lever.; and Fig'. 12 aside elevation ofthe stop cam vcarried by the tight pulley.`` 'i l Referring to the gures, the sewing machine frame comprises the cloth orbed plate .1 provided at its front and rear'ends with Specicaton of Letters Patent. Patented Sept. 5,1916. Application med April 7, 1913. serial no. 759,346.

downwardly extending plates 2 and 3, respectively, and at its front'and rear sides JOHAN s. FINCH, or :enrnenromg connncrrcur, Assreno'n 'ro THE smeren MANUFAC- with similar' plates 4 and 5, respectively,

said plates being preferably formed integral with'thebed-plate Iand at their lower edges provided with feet or'rests, as 6, said bedplate being provided with the usualbracket arm comprising the standard 7 .and arm bracket 8. I

-The main or driving shaft 9 is mounted in suitable bearings, as 10, depending from beneath the bedplate,and at its rearend is provided with loose and tight pulleys, 11 n and l2, respectively, and'hand wheel; 14. k"'15 represents a *horizontallyv arranged gearlshaft mounted to rotate in suitable bearings, as' 17, and providedwith acbevel gear 16, the axis of 'said gearshaft being arranged parallel withbut Aslightly outof line with the axis 'of said mainshaft.` The adjacent ends of the respective shafts `are operatively connected by avariable motion mechanism comprising the crank 1.8"carried by the main shaft, crank 19 carried by Athe gearsshaft and variable motion link 2O for' operatively connecting said crank members. The present variable motion mechanism is the same as that common to lock-stitch sew.- ing machines generally wherein the looptaker is given buta single rotationf to 4one pomplete actuation ofV the needle-carrying 21 represents' a .vertically arranged looptakerdriving`shaft provided at its upper end with a loop-taker driver 22 and mounted to rotate in suitabley bearings formed in the bracket 23 secured by screws, as 24, to the underside 0f thebed-plate, -theshaft 21 be` ing provided with a bevel gear 25 which meshes with the gear 16, thus transmitting rotary movements from 'the main shaft y9 to the loop-taker 26, which "latter is, provided with the usual bobbin-case27- -containing a mass of bobbin-thread ,(not shown). In the present construction the loop-taker 26, its guide-bracket28 andthe'driverf22 are substantially the vsame in construfction and relative action as those representedby United. States patent to Wheelerand Dial, No. 328,165, dated'October 13,1885. l ,129 represents. arishaft-cra'nk formedintegral with the main shaft,'yand 30, a shaftcrank connection operatively eonnecting said f v mail! shaft with the-crank lcarried by the needlefbar-actuating rock-shaft 62, the lat-v ter being inountedin bearings and 84 formed in the depending brackets 85 and from the main shaft, to said needle-bar` stitch-forming movements in the direction of its length.

The needle-bar 40 is mounted in bearings 42 and 43 formed in the arms 44 and 45, respectively, of the rocking needle-bar frame 46, which latter is fulcrumed upon an eccentric bolt 47 passing through the plate 5 and secured by screw 48'in a bearing hub 49 forming a part of the bracket-plate 50 secured by screws, as 51, to the depending bracket 35.

represents a needle-vibrating lever fulcrumed on a stud 53 threaded into the baseplate and at one end provided with a cam follower 54 which tracks grooves, as 55, of a switch cam 56 carried by the main shaft, the opposite end of the lever being pivotally connected to a needle-bar-vibrating -link 57 which in turn is pivotally connected to the needle-bar frame 46 by a stud screw 58 threaded into the arm 44 of the frame 46, thus transmitting rocking movements from the main shaft to said frame.

59 represents a feed-cam provided Awith a groove 60 (shown in dotted lines only, Figs. 1 and 2) and secured by screws, as 61, to the main shaft 9, and 62 a feed rock-shaft lever provided at one end with a cam roller 63 which tracks the groove 60, the opposite end of said leverlbeing secured by a pinoli screw 64 upon a feed rock-shaft 65 mounted.

to oscillate on pintle l'iearings, as 66, said feed rock-shaft being provided with arms 67 and 68 between which is pivotally suspended the feed-dogcarrying bar 69 provided with the feed-dog '70, the contour of the groove 60 being such as'to give to the feed-dog feed movements, and 71 represents a feed-dog lift camsuitably secured upon the gear-shaft 15, the periphery of said cam acting` on a stud 72 secured in the feed-dog-ca'rrying bar 60 to effect vertically arranged movements of said feed-dog-` thus transmitting from the main shaft' to said feed-dog feed and feed lift movements.

-lt is to be understood that the present' feeding mechanism. comprises the commonly employed four-motion 4feed.

73 represents an eccentric carried by the main shaft, and 74 an eccentric connection, one end of which encireles said eccentric, its opposite end being pivotally connected with a crank arm 75 fast on the bender-carryingbar-actuating-rock-shaft 76, which latter is annesse provided with mounted a spiral spring 88 which at one end abuts against'the lower end ofthe sleeve 79, its opposite end being seated against the collar 84 secured by screw 85 on the bar S0. The collar 84 is provided with an extended portion 86 forked to receive the cloth? presser-carrying bar. 87 (the outer prong 88 only being shown, see Fig. 4)., said forked err-r tension acting to hold the bar against accidental axial movement. Adjacent to the opposite end of the sleeve 7 9 there is secured upon the bar SQ, by screw 88" a second collar 89 for limiting the sliding movements of said sleeve when acting to lift the fabric.

bender from engagement with themateri'albeing acted upon, the downward movement of vsaid sleeve causing the edective end of the fabric bender to come in contact with the fabric, which movement vis controlled to compress the spring 83, thus "causing the bender to be held in contact with the fabric until the sleeve in its upward movement again comes in contact with the collar 89, thus; transmitting oppositely arranged vertical movements from said main shaft to said fabric-bender.

As in earlier constructions, the clothpresser-carrying bar 87, provided with a cloth-presser 90, is mounted insuitable bearings formed in the head 81 and normally held depressed bv a spring 91 seated upon a lift collar 92 provided with an extended por'- tion 98. which latter, in the absence of other means, is acted upon by the presser-barlifting lever 94 to more the presser vertically.

95 represents a throat or needle plate suitably secured in the bed-plate, and at its upper side provided with a groove 96 into which the fabric is forced by the action of the fabric-bender when the machine is actuated to form stitches, 97 an opening for the reception of the feed-dog, and 98 an opening for the needle-guard.

100 represents a needle-plate bracket pivoted at one end on a fulcrum'pin 101 secured in the needle-plate, 'its opposite end being secured against accidental movement by a screw 10Q threaded into a depending portieri 103 of the needle-plate, said bracket being provided with a needle-opening 104.

105 represents a. needle-guardscarrying bracket provided with a needle-guard 106 and pivoted at one end upon the pin 101, a spring 107 normally acting to hold said iro! bracket down upon the stop 108 :forming a part of the bracket 100.

For controlling the effective action of the needle-guard 106 there is employed a needleably secured in the bracket 23, a cam 116 carried bythe loop-taker-driving shaftV 21 acting, through the adjusting screw 113 coming in Contact with the depending lug 117 of the bracket 105, to give to said needleguard vertical movements, and the contour of said cam is such as to cause the needleguard 106' to properly support the needle at the time the latter is about to pierce the fabric.

Power is transmitted from the supply to the machine through suitable connections,

and for properly controlling such transmission of power there is employed a stop-motion mechanism comprising a vertically movable plunger 118 mounted in suitable bearings formed in a f rocking frame 119 pivotally suspended upon pintlescrews 12() secured in a bracket 121 which, in turn, is suitably secured to the standard 7, a spring 122 normally acting to hold said plunger in its depressed position. The frame 119 has formed integral with it an arm 123, to the outer end of which is pivotally attached one end of a link 124, its opposite end being pivotally connected with a rod 125` which passes down through the bed-plate andis at its lower end acted upon by a suitable manually controlled treadle (not shown) 'to rock the frame 119 in the direction indicated by the arrow t, Fig. l., or in a direction to connect the tight. pulley 12 with the source of power, a spring 126 normally acting to hold said frame at its limit of movement inthe direction opposite' that indicated by said arrow.

127 represents a stopmotion cam 4carried by the tight pulley and provided with an incline '128, cam `wall 129 and notch 130, in which latterthe lower endof the plunger is seated when the machineis at rest. The

stop-motion mechanism herein employed is' substantially the same as that illustrated and described in United States patent tov G. S. Hill, No. 541,276, dated June 18, 1895, Ato which reference may be had.

-131 represents a clothpresser-bar-actuating lever`pivoted by screw 182 upon the bracket arm, and at its forward end operatively connected with a lug 133 forminga part of the lift collar 92, its opposite'end being pivotally connectedto one vend. of a link 184 whose opposite end is secured .in like manner to the arm 128, from which it the frame 119- in 'the' ,direction indicatedv by the arrow t, or in the directionforfstarting the machine, the 'forwardend ofthe lever 131.l willf'be rocked downward, jthus permitting the spring91 to force the vpresser; into contact withY the fabric,and whengby theV resiliency .of the springv .126,.the-,f frame 119 is rocked in the opposite directiomor in the direction for arresting the action of the machine, the lever 131 will be rocked inthe direction for elevating the cloth-presser, in opposition to the action of the ,spring 91.

'-135 represents the needle-thread take-up lever pivotally secured tothe underside" of the bed-plate 1 by screw 136'and actuated in the usual manner from the take-.up cam 137 carried by the main shaft, the sewing thread being directed from the supply to the threadcheck 138, thread-tension 139 take-up guideeye 140, and through.Y the leaders, as 141, and roller gulde 142 to the needle eye.v In the operation of the machine, supposing the production to be the finishing of buttonholes, the operator places the shoe vamp in which the buttonholes have been worked upon the guide-plate 143 mounted on the frontl slide plate 144, with the loose threads lying between the successive buttonholes in contact with said last mentioned plate, and in such position ast-0 cause the threads to pass between angularly arranged guiding elements, as 145, thus insuring that the lateral ymovements' of the needle will alternately form blind stitches in the vamp at opposite sides of .said threads as the vamp is fed beneath the presser-foot and fabricbender.

`.of a. needle-guard, a bracketsustaining said needle-guard andl pivotally suspended be-` low the needle-plate, and operative connections including abell-crank lever 'between said bracket and said loop-taker shaft to move said needle-guard'into effective relationship with the needle at a predetermined point in its movements to form stitches.

2. In asewing machine of the character described, the combination with stitch-forming and cloth-'feeding mechanism including a loop-taker shaft provided with 'a loopwill be obvious that when the operator rocks taker, a needle, a needle-carrying' bar and neede-pate, theiattei provided with e deteiehabe bracket having a medie-opening into which the needle passes before entering thel fabric, and means for forming iiends in 5 the latter, of a needleguard, a biacket sustaining the latter pivotally suspended below the needle-plate, `sind operative connections including :L bell-crank; lever between said bracket and the loop-taker shaft to move.

10 said needle-guard into eieetive relationship :moesen name to this specification, in the presence of two subscribing witnesses.

JOHN S. FINCH.

Witnesses:

ABBIE M. DONIHEE., FRANK M. WooT'roN.

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