US1111167A - Sewing-machine. - Google Patents

Description

G. E. MOLYNEUX.

` SEWING MACHINE.

APPLIGATION FILED 0619, 1909.

Patented sept. 22, 1914;

4 SHEETS-SHEET 1.

WITNESSES Y Patented Sept..22,1914.

4 SHEETS-SHEET 2.

G. E. MOLYNBUX.

SEWING MACHINE.

APPLICATION FILED 00T. 9, 1909.

vG. E. MOLYNEUX.

SEWING MACHINE.

APPLICATION FILED 0012.9, 1909A Patented Sept. 22, 1914,

4 SHEETS-SHEET 3.

lll-IIIII Hummm Byv Al fron/vn G. E. MOLYNEUX. SEWING MACHINE.

APPLICATION FILED 0019, 1909.

1,1 1 1,167, l Patented 581313.22, 1914.

4 SHEETS-SHEET 44 /NVENUR M7/QM ATTORNEY WITNESS/:"8

UNITED STATES PAgTEN T OFFICE.

GEORGE E. MOLYNEUX, OF BAYONNE, NEW JERSEY, .ASSIGNOR lTO THE SINGER MANUFACTURING COMPANY, A CORPORATION 0F NEW JERSEY.

a citizen of the United States,v residing atV Bayonne, iin therounty of Hudson and State of New' Jersey, 'have invented certain new and useful Improvements in Sewing-Machines, of which the following is a specification, reference beiing had therein to theI j f the cylinder-bed beneath its accompanying drawings.

This invention relates to an improvement in that class of sewing machines designed more particularly for stitching seams disposed lengthwise of tubular articlesV such as the sleeves and legs of garments. I It has for its object to provide, in conjunction' with stitch-forming mechanisin comprising -a reciproting needlev and a thread-carrying looper, 'devices-for controlling the *upperv and lower' threads ,in the the machine is installe carrier to production of uniform stitching', and to afford means of easy manipulation of the ma* chine lin performing its work. l j

In its preferred form, the improvement is embodied in a machine constructed with a fra-me comprising a cylinder-bed and an overhanging bracket-arm offset laterally of thefcylinder-bed and having a. head. which is correspondingly substantially in the plane of the axis of the cylinder-bed, in order that the work adjacent the stitching position may not be excessively shaded to prevent proper inspection of the work by the voperator when ina position imperfectly lighted. The looper isiixed upon a looper-carrier pivotally mounted upon a longitudinal rock-shaft having .at its rearward end :inoperative connection with the main-shaft which extends'longitudinally of and is embraced by the cylinder-bed and carries at its forward end a peripherally groov'ed camentered-'by a lateral stud of a reciprocating rod connected with the looperwhich it imparts rocking 'or needle-avoidingv movements. The looperthread is ledthrough'a'suitable tension ,y device upon the hracket-arm downwardly through an external housing a tubular guide and laterally through the side wallof the cylinder arm whence it 'passes throiigh the p11ll-ot`r`,nip ping and take-up 4devices andthen through an aperture in the opposite side Wall of the cylinder-bed from which it extendsthrugh groove in the bedand Specification of Letters Patent. Application led October 9, 1909. Serial No.

Patented Sept. 22, 1914. 521,801.

enters a longitudinal aperture in the forward end portion of the latter from which 1t emerges into the looper-inclosing space within the removable end cap of the cylinder-arm. The takeup and pull-off and the intermediate nipper for the looper-thread are actuated by a thread-controller rockshaft disposed within and transversely of removable cover aiiording access thereto, this rockshaft having an adjustable actuating conf n ection "with the' main-shaft'. Upon the tl'.-readcontroller rock-shaft arel mounted for relative circular pull-oli' and take-up thread-engaging cams in the form substantially of triangular arms with rounded outer extremities, these cams being embraced by two pairs of eyed guidea-rms pivotally and independently mounted and provided with adjustable stop-screws adapted to engage fixed abutments to ad oiiset, so as to bring they Aneedle-bar and presser-bar to one side of the head just the guide-eyes toward and from the axis of oscillation of their respective thread*- engaging cams. Fixed upon the thread-controlljer rock-shaft intermediate its take-up and pull-o cams is a nipper-actuating cam adapted to act upon a flipper-lever carrying one jaw of thenipper disposed intermediate the two pairs of guide-arms, the other aw of which is fixed with its operative 'tace in substantial alinement with the thread-eyes of said guide-arms.

is a rear side elevation, `front side elevation, representing a feed-upthe-arm sewing machine embodying the present improvements. Fign is a rear end elevation of the machine with the base and hollow standard of the bracket-arm in scction to expose the parts inclosd therein, and F ig. 4 is a front end view ofthe machine with the forward end of the work-supporting arm or horn in section and the face-plate removed. l Fig. 5 isv a plan of the machine with the base of the bracket-arni in section and the overhanging member of the same removed and the cover-platesl for the worksupport omitted. Figo 6 is atransverse section of the' 'outer vend portion of the cylinder bed, and F ig. 'T a perspective view of the removable end cap 'ofthe same. Fig. 8 is a perspective View ofthe looper-carrier ,and plooper, and Fig. 9 asimilar view of the looper-carrier supporting stud. Fig. 10 is a detail side view of the looper-carrier rockadjustment the spaced ln the accompanying drawings, Figure l and Fig. 2 a sectional 18 fixed upon the needle-bar ing mechanism, and Fig. 11 a perspective view of a member of the connection between such mechanism and the looper-carrier. Fig. 12 is a perspective view of the upper portion of' the head of the bracketarm with its needle-thread controlling 1mechanism. Fig. 13 is a perspective view ofthelooperthread controlling mechanism. Fig. 14 is an enlarged detail sectional plan view rep` resenting. one side of the work-supporting.

horn with the thread-housing groove therein. Fig. 15 is a sectional elevation of one of the needle-thread tension devices, and Figs. 16, 17 and 18 are detail views of portions of the feed-actuating mechanism.

The frame of the machine is shown formed with the hollow base 1 and standard 1", overhanging bracket-arln 2 and cylinder bed or work-supporting horn 3 having its flange -i secured by screws 5 to the base beneath thel bracket-arm. As represented particularly in end view in Figs. 3 and 4, the bracketarm is ofiset from the hollow standard of the frame backwardly toward the rear side of' the machine in relation to the center of the cylinder bed which latter it does not thus overhang at the front side; the head 6 of the bracket-arm being similarly offset to such extent that, while its front side is directly above the corresponding side of the bed, the rearward side extends materially backwardly of the rear of the bed, and is substantially flush with the back of the arm 2 and upper portion of the frame standard, as indicated in face view in Fig. 1. The standard is provided at the rear end with a bearing boss 7 containing the bushing 8 in which is journaled the rear end of the mainshaft 9 fitted within a bearing member 10 formed upon the rearward end of the worksupporting arm 3. The reduced forward portion 9x of the main-shaft is journaled in a bearing boss 11 near the forward end off the arm 3. The bracket-arm is provided at its rearward end with abearing boss 12 in which is journaled the rearward end of the needle-actuating rock-shaft 13 whosev for ward end is fitted to and passes through the bearing member 14 into the cavity 6X in the head 6 of the bracket-arm, where it is provided with the usual crank-arm 15 carrying a pin 16 connected by means of the pitman 1 with a lateral pin upon the colla]` 19 carrying the spaced` eye-pointed needles 20. Upon the rearward end of the rock-shaft 13 is fixed the lateral crank-arm 21 which carries the stud 22 embraced by the upper end of a pitman 23 whose lower end embraces a crank 24 formed in the main-shaft 9 and ada ted to communicate through the descri ed connectingl mechanism reciprocating movements to the needle-bar and needle.

The needle-actuating rock-shaft 13 has fixed thereon, at the opposite side of the v37 within the cylinder-bed 3 e carrier.

bearing boss 12 from the crank-arm 21, a second lateral crank-arm 25 carryin a screw-stud 26 embraced by the upper en of the pitman rod 27 v-whose lower end embraces a yscrew-stud 28 intermediate the ends of a vibrating lever 29 having one end journaled upon the fixed fulcrum-pin 30 mounted in an inwardly projecting boss 31 formed upon the standard 1. The outer end of the lever 29 carries a screw-pin 32 connected by means of a link 33 with a similar pin 34 carried by a crank-arm 35 fixed upon the rearward end of' the looper rockshaft 36. The component members of the operative connections between the needleactuating and looper rock-shats--are so arranged and proportioned that thevrocking of the former through its crank' and pitman connections with'the actuating crank 24 of the main-shaft causes the screw-pin 32 to move into and out of alinement with the fulcrum-pin 30 and crank-pin 34 of the crank-arm 35 in imparting each complete reciprocation of the needle, whereby the looper rock-shaft receives a dwell in the production of each stitch as theneedles attain 'their highest position and begin their descent for a succeeding stitch.

The looper-shaft 36 is journaled at its rearward end in the bearing member 10 and at its forward end in the bearing member with the mam-shaft, justably, upon its screws 38, the split collar 39 with forwardly projecting stud 40 of angular cross-section with parallel sides, as shown particularly in Fig. 9. The stud 40 is provided with a transverse aperture 41 and the axial screw.- hole 42 extending from its forward extremity. 'The looper-carrier 43 is formed vat its upper end with the usual socket in which is secured by means of the fastening screw 44 the shank of the eyed-looper 45 whose blade 46 is arranged in practice transversely of the cylinder-bed and the supporting shaft 36. The body of the looper-carrier is formed with a rectangular transverse aperture 47 whose parallel opposite sides are fitted to the perforated sides of the supporting stud 40 upon which mounted by means of the fulcrum-pin 48 having the iat side 49 engaged by the point of the stud-screw 50 entering the axial screw-,hole 42 of the supporting stud. In its lower end, the looper-carrier is split and formed with a segmental raceway 51 whose walls are relatively adjustable bynieans of the transverse adjusting screws 52 crossing the slitted portion of the body of the looper- As thus mounted, the looper derives its operativey loop-seizing and shedding movements v fromy its supporting rock-shaft 36, and its sidewise or needle-avoiding moveand has secured adandv parallel both longitudinally and circularly, forward end, by means of clampingy lll) it is plvotally ments are imparted to it by means of an acv tuating cam 53 secured upon the forward y oscillate freely upon one side with a spline end of the mainsshaft extension 9X by means of setscrews 54,

and provided with a pez ripheral cam-groove 55.

Jurnaled in the bearing member 37 beneath and vparallel with the -looper roekshaft 36 is a reciprocating rod 56 formed 57 to prevent its while permittingits free endwise movement, and having adjustably secured to its rearward endby means of set-screws 58 a collar 59 with a rearwardly extending arm 60 carrying -a roller-stud 61 entering the groove 5510i? vtieca'in 53 from which it derives its reciprocatory movements. The reduced forward end portion 62 of the rod 56 is vertically split and provided with a socket in which is fitted and in which may be secured by means of the clamp-screw 62* the shank 68 of a ball-stud whose spherical poition 64: is fitted within the suitably socketed independent sections of awearing block which is in turn fitted withinthe segmental raceway 5l of the looper-carrier whereby the looper-carrier is permitted to with its supporting shaft, while the reciprocating movements of the rod 56 are communicated through the stud 63 64 [and slide-block 65 to the looper-carrier which is thereby caused to rock upon the fulcruni-pin 48. By reference to Fig. l1 it will be observed that the adjacent faces of the slide-block sections 65 are slightly separated, owing to portions of their sockets being slightly shallowerthan the diameter of the ball 64 upon which they are fitted. The adjusting screws 52 of the loopercarrier therefore not only take up the wear of the slide-block sections 65 upon lthe side walls of the raceway, but serve to close the Slide-block sections upon the ball-stud to compensate for the wear of the latter in its socket. r

As will be observed by reference more particularly to Figs. 2 and 6, the bearing members l1 and 37, of the cam-cylinder are so arranged 'as to afford an intermediate Voil cavity 66 in which the cam-cylinder 58 is inclosed, whereby the same is effectively lubricated at all times.

The machine is shown provided with the power transmitting device forming thcssubject of my Patent No. 987,640, of March 2l, 1911, whereby means are provided for automatically connecting with the main-shaft a transverse hand-wheel shaft G7 provided in a bushing 68 in a lateral bearing boss 69 of the base 1 and carrying the hand-wheel 70.

To this end, the shaft 67 carries a. bevel' friction-wheel 71 normally in Contact relation with a similar bevel-whecl 72 slidingly mounted upon the main-shaft S) and provided with a hub 78 having an annular groove 74. The hub of the wheel 72 is the back of the disk splined upon the shaft 9 so as to rotate therewith while being freely movable endwise thereon.

Fixed upon the shaft S'adjacent the hub 73 is a spider comprising the collar 7 5 with forwardly and outwardly projecting-arms 76each forked in its outer end to embrace a bell-crank lever comprising' the arm 77 providedl-with a spherical weight 78 and pivotedtosaid arm by means of a pin 7 9. The other angularly arranged arm of the bellcrank lever terminates in a ball 80 entering the groove 74 in the hub 73 of the wheel 72.

A spring`1 8l interposed between the fixed collar 75 and the sliding hub 73 serves to maintain the wheel 72 in operative contact relation with the wheel 7l when the machine is at rest, but as soon as the machine attains sufficient speed, the weights 78 fly out by centrifugal action, thus shifting the bellcrank levers 77, 80, and reti-acting the Wheel 72 from Contact with the wheel 7l. The hand-wheel is thereby permitted to come to rest and to remain inactive while the stitching proceeds. As the machine is stopped the spring 81 overcomes the r duced centrifugal action of the weighted bell-crank levers and operates to recouple the friction wheels ary manual control at the beginning and end of a stitching operation. As the crossshaft 67 carrying the comparatively heavy balance-wheel 70 becomes disconnected from the main-shaft soon after the latter begins to rotate, the load upon the main-shaft during the greater part of each continuous stitching operation is only that of the active parts of the mechanism without the usual dead weight, and consequently the machine attains full speed much sooner than when it has the additional load imposed by the inertia of the balance-wheel.` For a corre- Spending reason, the automatic recoupling of the balance-wheel shaft with the mainshaft as the machine is coming to rest causes the braking of the machine incurred by the added load imposed in overcoming the inertia of the balance-wheel shaft with its load.

The friction-wheel 72 is shown formed of a body portion of yielding material, such as leather, clamped between two'disks 82 and 88, the forward disk being formed with an annular recess 84 in which is pivoted by means of a shouldered screw 85 a lateral ear or flange 86 of the ball-eccentric 87 which is provided with an oppositely extending lateral ear or iange 88 in which is tap Jed the threaded forward extremity of an adljusting screw 89 passing through a segmental slot 90 formed concentric with the screw 85 and extending through the wheel 72, the head of the screw 89 being normally seated upon 82. In order to ermit the lateral shifting of the eccentric 8 it is 72 and 71 for the customupper formed with a slot 91 which is also concentric with the pivotal screw 85, the lateral movement of the eccentric in relation to the main-shaft providing for the adjustment of its throw in a manner well-known.

The feed eccentric 87 is embraced by the strap 92 of an eccentric rod 93 whose opposite end embraces a ball-eccentric upon the rearwardly extending arm 94: of a plural*- armed rocker mounted upon y Crum-stud 95 carried by the lugl 96 extending' inwardly from the wall of the base 1, and having a second laterally extending arm 97 carrying a ball-stud embraced by a strap 98 at the rearward extending longitudinally through the worksup'p'orting arm 3 above the rock-shaftl 36 and formed near 1ts forward end with a re` duced cylindrical portion 100 to which is secured the slide-block side to receive the .shank 102 of the serrated feeddog y103 secured therein by means of the fastening screw ing member 37 of the arm 3 is notched in its upper side in a manner well-known to form a longitudinal guideway for the slideblocklOl.

lTo the reducedl intermediate portion 100 of the feed-bar 89 is slidingly fitted-a tilting bearing orfulcrum-block 105 formed with lateral bosses 106 which are entered by the.

fulcrum-screws 107 passing through the opposite members of afyoke 108 embracing said block and formed at the upper end of an u pright lifting bar or post 109 apertured at its lower end to form a strap 109x to embrace the feed-lifting eccentric 110 fixed upon the reduced forward portion 9 ofthe mainshaft 9 adjacent the cam-cylinder 53 and dis posed within the oil cavity 66. The post 10,9y has also a clearance aperture intermediate -its ends. Athrough whichy passes looper rock-shaft 36.

'As will be observed, the longitudinal-reciprocating movement of the feed-bar for effecting the advance'of the work up the arm of the machine toward'the standard 1x is produced through its described connections with the feed-actuating eccentric 87, whilethe rising and falling movements' of vthe feedidog are produced bythe feed-lifting eccentric 110 through the post 109 and tilting bearing 105 swiveled therein.

It will be observed that, by extending the driving shaft 9 into the forward end of the work-supporting arm 3. not only is it practicable to impart the Alifting movements to v the feed-bar directlv therefrom adjacent the point ofengagement of the feed-dog with theworkybut the rocking movements of the louper-'carrier mav be communicated by the employment -`of a. short rod or pin 56 of light weightand therefore oi'ering little momenl tum to overcome in"A the'o'p'eration of the machine .at highspeeds; 'By the'employment the fixed ful.-

end of the' feed-bar 99v 101| cl1`anneled in its.

104. The bear- 'of a grooved cam, the pin 56 is adapted to be disposed in alinement with the shaft section 9*, the parts being thus arranged very compactly, so as to provide for a work-supporting arm 3 of small diameter for accommo-:- dation of hollow articles of the smallest sizes, vsuchl as sleeves of childrens garments,- which the machine is designed to stitch.

Journaled upon center-screws 111 extending inwardly through the walls of the upper portion of the arm 3 is the transverse threadcontroller rock-shaft 112 having fixed Vthereon the upwardly extending take-up cam-arm 113 with cam-shaped hub 114 and adjacent pull-off cam-arm 115 whose hub 116 is secured for circular adjustment upon the shaft 112 by means of the set-screw 117. The cam-arms 113 and 115 are of substantially. triangular shape with rounded outer ends, and each is embraced by a pair of guidearms 118 119 and 120-121, respectively, the

arms of each pair being formed upon a plate 122 123, respectively, each of which plates is formed with a rearwardly extending lug 124 ,pivotally mounted by means of the fulcrumpin 125 upon the reduced upper end portion l126 of the standV 127 whose foot 128 is formed with a longitudinal tongue 129'and fitted upon-the top 'of a. lug 130 rising from the bottom of the horn 3 upon which it is secured by means of the screw 131. Each of the plates 122 and 123 is provided with a stop-screw 132 passing through the same and resting upon a shoulder afforded by the upper portion of the stand 127 and by turning either of these stop-screws the normal posi` tion of the arms carried by the respective plates is adjusted relatively to the outer or y Each operative portions of the cam-arms. of the several guide-arms is provided with a thread-eye 133 adapted tr be' disposed' certain positions of the latter.

The stand 127 carries an upwardly extending lu -134 whose iat forwardface is disposed directly above the nipper-actuating cam 114: afforded by the h'ub of the takeyup cam 113, and opposed to the lixe'd ni perjaw thus provided is a spring-jaw 135 a orded lby the flat spring 136 extending lu'p-' wardly from the foot 128 of the stand 1 2'7 upon which it is rigidly secured by means of the screw 137.

For convenience in lifting the thread arms for threading, the arms 119 120 are extended forwardly and toward each other beyond their respective thread-eyes, and either may be engaged by the finger of the operator for lifting thel pair forming a. part of either the take-up or pull-0E device. As will be observed, the thread-eyes of the guidearns-are all arranged at the same distance from. the fulcrum-pin. face of the fixed nipper-jaw 134, so that when the nipper-jaw is opened while the `alinement with those ot the other arms 1n 125 as the operative.

take-up Aand pull-oil' `cams are in their extreme forward or backward positions7 the thread is permitted to pass freely in a straight line through the apertured guidearms and between the nipper-jaws.

.Fixed adjustably upon the thread-controller shaft 112 by means of the set-screw 138 is a crank-arm 139 pivotally connected by means of the stud-screw with one end of a pitman-rod 141 Whose opposite end is pivotally connected by means of a pin 142 with an upivardly extending arm 143 of a rock-shaft 144 provided with a lateral arm 145 carrying a ball-stud 141-6 embraced by one end of an eccentric-rod 147 having at its -opposite end a strap Which embraces the ball-eccentric 148 fixed upon the main-shaft adjacent the needle-actuating crank 24. Through the connections above described, the eccentric 148 imparts rocking movements to the thread-controller shaft 112. By circularly adjusting the position of the crankarm 189 upon the rock-shaft 112 the looperthread engaging members controlled thereby may be set forwardly or backWardly to change the time of their action in setting the stitch and drawing thread for a succeeding stitch; and fby adjusting the cam-arm 115 upon such shaft by loosening and retighteningl the set-screw 117, the relation of the pull-od' cam to the take-up and nipper-actuating cams may be. changed. It will thus be seen that the take-up and pulloif cams are adjustable in unison or relatively to produce the desired timing for properly handling different kinds of thread in the performance of different kinds o work.

Coperating with the feed-dog 103 in con trolling the feedof the W'ork is'tlie presserfoot 149 whose shank 150 is rigidly secured to the lower end of the `presser-bar 151 journaled in suitable bearings in the head .6 of thelnacket-arni in the plane of the needlebar in relation to the direction of feed and the center of the Work-supporting horn. The cavity 6c of the head 6 is provided with a rearwardly extending aperture 152 through which passes a lateral lug 153 of a collar 154 fixed upon the presser-bar 151;

`the top of the lug 153 affording a seat for thevfree end of a Hat pressure spring 155 secured by means of a pin 156 upon a lug 157 extending 'from the standard 1x and being engaged intermediate its ends by the depending knurled head 158 of an adjusting screw 159 tapped into a boss 160 in the lower side of the bracket-arm 2 and maintained against Working loose by means of the. set-nut 161. A finger-lever 162 with cam-shaped operative end 163 is pivotally mounted in the head 6 and adapted to engage the under side of the lug153 for lifting the presser-foot by hand. The presser-bar is provided above the collar 154 with a second collar 164 provided witha rigid lateral arm 165 to which is pivot-ally connected the lower end of the rod 166 Whose upper end is pivotally attached to one end of a rocklever 167 'fulcrumed intermediate its ends by means oi a .screw 168 upon a stud 169 secured for vertical adjustment in a suitable socket in the head 6 of the bracket-arm by means of the set-screw 170. The opposite end of the rock-lever is formed with a trans- .verse guide-slot 171Icrossed by an arm 172 "adjustably secured upon the rock-lever 167 by means of a clamp-screw 173. As Will be o served, the rock-lever 167 is normally stationary, but is tilted more or less upon its fulcruin-pin 168 by the rise and fall ofthe presser-foot under variations in the thickness of the material operated upon.

The upper end of the needle-bar is provided 4with a washer 174 from which projects laterally a linger 175 provided with suitable upper thread-guidingeyes;and in advance of the said eyes and in line with the slotted end of the rock-lever 167. is disposed the fixed upwardly extending threadguiding arm 176 having in its upper extremity the guide-eyes 177 the shank 178l of said arm being let into a seat formed inthe forward face of the head 6 of the bracket-arm and secured therein for vertical adjustment by means of the fastening screw 179 passincr through a slot 180 therein.

ilounted upon a fulcrum-Stud 181 upon the rearward side of the arm is a presser-u foot lifting lever 182 Whose forward portion enters a vertical slot 183 in the rear side of the head 6 of the bracket-arm Within -which it is turned upwardly to form a crook extending beneath the arm 165 of the collar 164. and provided With a lug 18st between which and a staple 185 upon the bot-tom of the cavity 6 is a spring 186 for maintaining the forward arm .of the lifter-lever depressed `out of contact with the arm 165 rigidly connected with the presser-bar. The rearwardlyextending arm 182* of the lifte'r-lever has an eye at its rearward end to which is applied the hooked upper end of a buffer springr 187 to which is connected the treadle or knee-lever chain 188 by which the lifter-lever is tilted to raise the presser-foot and draw oit an extra length of the needlethread passing through theeye 171 of the rock-lever 167 for beginning a succeeding stitching operation.

Secured upon the top of the bracket-arm by means of the fastening screw 189 is a bracket 190 into which are tapped the shouldered tubular posts191- of the needle-thread Vtension devices each providedtin the upper portion with a vertical diametrical slit 192 and threaded externally to receive the nut 193 between 'which and the washer 194 resting u pon the upper member of a pair of tension-t isles 195 is interposed :the spring 196.

lClamped upon the bracket-190 by means of the'posts 191 are the plates 197 each pro- .vided with a rforated guide-ear 198 for directin the t read between the respective tensionisks. The washer 194 is'provlded 'with the usual perforation for passage of the ost 191 andwith a cross-bar 19flX extending through the slit 192, and within the axia-l aperture of each post 191 1s loosely tted the thrust-pin 199 whose upper end `bears upon the cross-bar 194u of the washer 194 and whose lower end rests upon one of two cams or Ieccentrics 200 upon a transverse rock-shaft201journaled in the bracket 190. Upon the rearward end of the shaft 201 is adjustably secured by means of a setscrew 202 the hub of a crank-arm 203 which a link l204 having its 1s pivotally connected with the upper end of lower end pivotally attached to therearwardarm 182x of the presser-foot, lifter lever. vAs will be observed, when the lifter-lever is operated at th'e end' of a stitching operation to lift the presserfoot clear of the'work, the pressure of the tension springs 196r may be fromthe tension-disks 195, so that the needle-thread may be freely drawn through the tension device bythe actuation ofthe rocklever 167 in drawing off thread for the succeeding stitching operation.

The tension device for the lower thread 1s arranged-upon'th'e front side of the arm 2 near the standard 1", and is or may be similar to the tension devices for the -needlethreads, excepting that no release is provided therefor. This tension device comprises the tension disks 205 normally pressed together by .means of the spring 206 interposed between one member of the .same and the nut 207 upon the threaded post 208, the thread being led to the machine through an aperture in the guide-ear 209 Vupon the disk 210. The looper-thread, after passing between the tension-disks 205 enters the upper end of the standin guide-tube 211, provided with a series of lateral apertures 212 for purposes of inspection, and formed at the lower end with an angularly arranged nipple 213 entering an aperture through the wall of the rearward end portion of the cylinder-arm 3, a notch 214 being formed at the junction of the nipple with the lower end of the guide-tube 211 to facilitate threading. After passing through the pullofl', nipping and take-up devices as before explained. the looper-thread enters, through Vthe threading slit 215", a transverse a erture 215 in the rear wall of the cylin er-bed from which it is led along the bottom of an external longitudinal housing groove 216 v formed in the bed to a second transverse aperture 217 leading into y a' longitudinal aperture 218 passing. through the bearing member 37 at the rearward side of the feedbar slide-block 101.v As the thread emerges entirely removed from the lowerend `of the aperture 218 'it is threaded through the eyes of the loopervblade in a well-known manner.

The forward end of the body of the horn portion 219 upon which is fitted the adjacent extremity of the lremovable end-cap 220 216x continuin to the forward extremity of the member 3 the lateral threadpassage leading from the aperture 215, this extension being provided Vfor"convenience in threading the machine. v

Upon the front of the bed is secured by means of screws 221 the throat-plate 222 provided .with the usual feed-dog openings 223 and needle-holes224, and at the opposite end, which is slightly flared toward the base 1, is disposed an arched cover-plate 225 providedfwith spaced perforated lugs 226 entered by the pin227 by which itis hinged 4, thisA cover normally' closing the otherwise open top `o Athe horn 3 above the lowerthread cont olling devices,lbut being removable to afford access thereto for threading and other purposes. The top of the horn 3 is closed-intermediate the removable cover-plate or cover 225 and the throat-plate 222 by means ofthe plate 229 secured thereon byffaste'ning screws 230. l

provided with the usual grooved belt-wheel 231 embraced by a belt from the source of power and confined thereon from accidental displacement by'means of the guard-post 232 extending rearwardly from the baclr of the base 1.

In threading the machine, the needlethreads a and looper-thread b are led through theirseveral tensions and threadcontrolling devices tothe needles and looper` respectively. as before indicated, and as represented in Figs.` 2. 5, 12 and 14 of the drawings. As will be observed. the needle-thread engaging members 171 and 177 are so positioned that the finger 175 moves first above and then below the same. whereby each stroke of the needle-bar while'the tensions are in normally closed position causes an initial slm-kening and a subsequent pull upon the needle-thread. The parts are so timed that the needle-threads are slackened as the needles begin to descend until their eyes have descended beneath the work. but are thereafter drawn up; andthe preceding stitches are finally set as the needles reach their lowest position, the lower-thread nipper being open at this time so as to permit the lower-thread loop to be readily drawn into place beneath the fabric. As the needles begin to rise to present their loops to the looper, the needle-threads are again slacktened. while their loops are entered 'by the 3 is formed with a reduced or shouldered to a lug 228`upon the front side of the flange lThe rearward end ofthe main-shaftis which effectively closes the extension-slit i *arrivingv at the extreme upper position at tained taut by the nal take-up action of the f mences its advance .or loop-seizing move- -heretofore constructed', it has been found looper, but as the needle-bar reaches its highest position, the needle-threads are tightened so as to draw through the tension devices 195 sufficient needle-thread for the succeeding stitch formation. As regards the handling of the lower thread, when the needles assume their eXtreme upper positions, the lower-thread take-up and pull-ofi' cam-arms are in eXtreme retracted position and the intermediate nipper open, the looper being in the extreme advance position with needle-thread loops upon its blade, the

needle-avoiding motion of the looper having just been completed simultaneously with the feeding action for advancing the Work. As the needles descend with their points about to enter the throat-plate, the looper` thread take-up and pull-off arms advance slightly past their central position opposite the thread-eyes of Ithe embracing guide-arms and' the nipper closes upon the thread prior to the arrival of the take-up and pull-off arms at cast-oil' position, the looper at this sta-gefbeginning'its retrograde or loop-shedding movement, and its thread being maincam-'arm lluntil the points of the needles descend below Ithe looper-thread intermediate the needle-hole of the throat-plate andthe eye in the louper point. lVhile the needles are descending to extreme lower position, the looper continues its retrogressive movement until its point is'y beyond the farthest needle, when the quick sidewise or needle-avoiding movement takes` place-so as to bring the lead of the louper-thread from the looper-point dinectlyto the needle-hole, when the arrival ol the needles to their extreme lower Aposition effects the setting of the stitch and the drawing of suiiicient looper-thread for the purpose freely throughthe looper from the supply previously drawn through the tenpox-,ting horn,

sion and through the now open nipper. As the needles begin to rise, the looper comment, the nipper closing simultaneously and the recedin take-'up consequently drawing up slack looper-thread, While thepull-oii" at the 4same 'time draws a fresh supply of looper-thread through the tension, this action continuing until the looper enters the thread-loops presented by the needles, when the tak'elup' and pull-od arrive at cast-off position and the nippcr opens. As the looper continues to advance. it draws'the slack just 'supplied by the pull-ofi' and moves into extreme advance position, the needles the same time preparatory tothe performance of a succeedin stitch-forming cycle.

' In machines of t 'is general character as necessary for'the operator to grasp the' needle-threads intermediate the tension device and the needle-bar to draw o' a suii- 1 cient thread Supply to permit the Withdrawal of the Work for the succeeding stitching operation Without endangering the unthreading of the needles. present invention, the tensions are released simultaneously with the lifting of the presser-foot for the removal of the Work, thus leaving the needle-threads entirely free to be drawn through the needles in the removal of the work, and leaving the hands of the operator entirely free for the handling of the Work.

From the foregoing description, it will he seen that the present improvement includes various constructive features of a novel character all of which contribute to the 'efliciency and convenience of operation of the machine, and thatthese several features are susceptible of considerable modification in construction and arrangement of their constituent parts without departing from the present invention.

According to the 1 Having rthus set forth the nature of the l invention, what l claim hereln is 1. In a' sewing machine', the combination with the vframe comprising a hollow standard sustaining a later-alli7 closed work-supporting horn and an over-hanging bracketarm, and a. main-shaft journaled in said frame, of a reciprocatingr needle and means connect-ed with the main-shaft for actuating it, a looper cooperating with said needle and disposed vwithin the work-supporting horn, ineens ,connected with the main-shaft for imparting operative loop-seizing movements to said Iooper, a thread-controller rock-shaft independent of the looper-actuating mechanism and mounted Within said work-supmeans connected with the main-sliaftavithin said standard Vand independently of its connections with the needle and loop-taker for actuatingr said rockshaft, thread-controlling means carried b v said rock-shaft for acting uponthe looperthread, and meansaoolicd to said worksu'pporting arm for affording access to the thread-controlling means.

2. ln a sewing` machine, the combination iic with the frame comprising a laterally closed WOrk-supportingv horn and an overhanging bracket-arm, and a main-shaft journaled within and 'disposed longitudinally fof the Work-supporting horn, of needle and means connected with the mainshaft for actuating it, a looper coperating with said needle and disposed Within .the work-supporting horn, means connectedl vwith themain-shaft for impartingoperative loop-seizing movements to said louper. thread-controller rock-shaft disposed Within and in transverse relation toithe Work-supporting horn, means connected with the main-shaft independently of its connections with the needle and the looper for actuating said rock-shaft, threed-controlling` a reciprocating means carried by said rock-shaft for acting upon the looper-thread, andnieans applied to said work-supporting arm for affording access to the thread-controlling'means 3; In a sewing machine, the'combination vwith stitch-forming mechanism including formed with thread-engaging opposite edges;

and an intermediate cast-o portion upon the outer extremity, both of said thread-engagingedges being substantially eccentric to extremity,

thread-guiding eyes dissaid rock-shaft, and

the path of posed upon `opposite sides of vmovement of said take-up cam-arm.

4. In a sewing machine, the combination with stitch-forming mechanism including a reciprocating needle and a cooperating eyed looper, of a rock-shaft, means for actuating said rock-shaft, take-up and pull-off camarms with an intermediate thread-nipper actuating cam mounted upon said rockshaft, said cam-arms being extended each from one side of said rock-shaft and formed with thread-engaging opposite edges and an intermediate cast-ofi portion upon the outer a thread-nipper substantially intermediate the take-up and pull-oil' camai'ms and one of whosethreadeengaging jaws is operated by said actuating cam, and a plurality of guide-arms embracing said takeup and pull-off cam-arms and thread-,nipper and provided with thread-eyes adapted. for disposition' in substantial alinement.

5. In a sewingmachine, thefcombination with stitch-forming mechanism including a reciprocating needleand a coperating eyed looper, of a rock-shaft, means for actuating said rock-shaft, take-up and. pull-off cams mounted upon and adapted for relative circular adjustment .upon said rock-shaft', an 'intermediate thread-nipper actuatin cam also mounted upon said rock-shaft, a t readnipper substantially intermediate the take cams .and one of whose thread-engaging jaws is operated by said actuating cam, and a plurality of guide-arms embracing saiditake-up and pull-oi cams and thread-nipper and provided with thread-eyes adaptedor disposition in substantial alinement.

6. In a sewing machine, the .combination with the frame comprising a `ylindrical work-supporting horn and an overhanging bracket-arm, and stitch-forming mechanism including a reciprocating needle and a c ooperating eyed looper, of a rock-shaft disposed within said work-supporting horn,

'spaced take-up and pull-ofi cam-arms with an intermediate thread-nipper actuating cam fixed upon saidl rockhaft, a thread-nipper l interior, and a removable cap applied to the intermediate the take-up and pull-ofi camarms and having one of its thread-engaging jaws in, operative relation with said actuating cam, aplurality of guide-arms provided -with thread-eyes and embracing said take-up and pull-ofi' cani-arms and the t-hrezul-nipper, and means for actuating said rock-shaft to more said. cam-arms repeatedly into and out of'alinement with the threadeyes oftheir respective 'guide-arms in each stitch-forming cycle.

7. In a sewing machine, the combination with stitch-forming mechanism including a reciprocating needle and a-copera'ting eyed looper, of a rock-shaft, means for actuating said rock-shaft, take-up and pull-0E cams with an intermediate thread-nipper. actuating cam mounted upon said rock-shaft, a thi'ead-nipper substantially intermediate the take-up and ull-0H cams and one of whose thread-engaging jaws is operated by said ac. tuating cam, two pairs of independently movable guide-arms embracing respectively the takeLup ,cam and the pull-oi'cam, and embracing between them the thread-nipper,- thread-eyes within said guide-arms adapted to be arranged in alinement, and means for independently adjusting the positions ofsaid pairs of guide-arms. A

8. In asewing machine, the combination with the frame comprising a work-supporting horn substantially closed at its outer endA and provided in its opposite end portion with a removable cover for access toits 100 forward end of said work-supporting horn and confining a. space at the end of t e latter, of stitch-forming mechanism comprising a-reciprocating needle and an eyed looper mounted within and embraced by said cap at the end of the work-sup orting horn, means for actuating said need e and looper, a 1ooperthread controlling device arranged within the work-supporting horn and beneath its removable cover, and means for actuating it, the work-supporting horn being provided with an external longitudinally extending thread-housing groove open throughout its Alength at the periphery of the horn to admitthe looper-thread laterally therein and connected at one end by a transverse aperture with the interior-adjacent the looper-thread controlling `device and at the other end with an aperture throu' h the forward portion of the horn with t e space surrounding the looper inclosed by said removable cap.

9, In a sewing machine, the combination with the frame-comprising a standard from which extends a laterally closed work-supporting horn with a top closed at its outer end portion but formed with anopening ad- 'acent the standard, and an overhanging racket-arm, of stitch-forming mechanism including an eyed looper disposed 'within izo said horn, feeding mechanism with actuating means therefor to impart to the same longitudinal workadvancing movements along said horn toward the standard, a looper-thread take-up movable upon an axis transverse to said horn and disposed within and beneath the said opening therein, and a hinged cover for said opening in the horn adapted to be withdrawn for access to the take-up device.

l0. In a sewing machine, the combination with the frame comprising a laterally closed work-supporting horn and an overhanging bracket-arm, and a main-shaft journaled in said frame, of a reci rocating needle and actuating means there .or, a looper coperating with said needle and disposed withinl the work supporting horn, looper actuating means connected to the main-shaft externally to and at one end of the work-supporting horn for imparting to the looper its `loop-seizing movements, a rocking threadcontroller acting upon the looper-thread and disposed within the work-supporting horn, and an operative connection between the thread-controller and the main-shaft independent of the connection of the looper-actuating means with the main-shaft and also external to but at the end of the horn.

v In testimony whereof, I have signed my name to this specification, in the presence of two subscribin witnesses.

G ORGE E. MOLYNEUX. Witnesses:

H. A. KORNEMANN, Jr., HENRY J.'M1LLER

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