USRE14529E - allen - Google Patents

Description

E B'. ALLEN BUTTONHOLE SEWING MACHINE,

APPLICATION FILED AUG.3, I918.-

' lama 2 swans-51m? -INVENTOR T ORNEY Reissued Oct. 8, 1918.

UNITED srATEs PATENT oriuor i nwann B. ALLEN, or BmDGriron-r, CONNECTICUT; Ass 'GnoR-To THE SINGER MANU- f raorunme COMPANY, A conromi'rion or NEW JERSEY.'-

nu rroniionu snwmo Acr'imE.

1452 f I Specification-of'Reissued Lettersrateht. Ri e 10 t 8,1918

I or inal n ..1,2e4, 2 52, dated July 24, 191?, Serial no. 37,830, inea July 3, 1915. Application for reissue aiea August a, 1918. Serial No. 248,213,

To all w' h0m arty/nay mm: erally toothed, gear-whee1 constituting the f 'Be it known that I, EowginoBjALLEN, a driven member of the feed-wheel actuating 55 citizen of the United States, residing at means meshing with a driving member in Bridgeport, in the county of Fairfield' and: the, form of a disk having a pluralitv of ec- 5 State "of Connecticut, have invented certain centrically' disposed pins movable upon an new and useful Improvements in Buttonaxis within the periphery .of the driven hole-Sewing Machines, of which the followmember. The peripheral teeth ofthe driven 'ing is a specificatiom-reference being bad member are shaped to afiordrespectively therein. to the accompanying drawings. active and dwell-producing portions in their '10 "This invention has for its primary object inner and outer parts for positive engagetoprovide a sewing machine witha pattern-'- mentwith the rotarvpins or elements of cam' wheel having actuating means which the driving member for production of a, shall be quick acting, intermittent noiseplurality of forward impi ilses of the driven c j less, withouti'mpact of its operative parts, member for each rotation of the driving accurate,' and underpositive control under member with intermediate dwells of fixed all conditions. It'ha's for another of its obduration extending through a. substantial jects to combine in a buttonliole stitching portion of the rotation of the driving mem- .n achine stitch-forming and feeding mecha her which latter is connected with 'and ro- .nisms which shall be so positively related in tates in unison with'the main or driving their timing througliout a buttonhole'pro' shaft. I du'cing cycle that-a series of barring stitches Bythe means -descri bed, the feed-wheel is of predetermined number and arrangement caused to perform a complete rotation of "may be-producedatan-end of the buttonuniform step-b v,stepi operative movements hole in absolutely fixed relation with the. for each buttonhole producing cycle, while adjacent side-stitch or stitches, there being i the operative positions of its cam portions at ino-incomplete or mongrel stitches connectcorresponding stages-of successive buttoning the sideEstitcheswith-the. stitches com-. hole producing cyclesarel absolutely fixed posing the body of the-bar. i so as to t me the relative movements of the While the present improvement. in its es- Work with the Working position of the sential features, is adapted forwidely difstitch-forming mechanism with precision in I ferent types and varieties of sewing marelation to the jogging-movements of'the chinescomprisingpattern-camWheels. it is needle. designed more particularlv for embodiment In the mechanism disclosed in mv said "in buttonholest-itching machines of thetype patents. the feed-wheel was actuated bv a sirepresented i mv United St ng/ P t nt clutch device which was lacking 1n pre'c i-' No. 1,030,046, of June 18. 1912 and No. sion in a degree which was inappreciable in 1,039,241Qof September 24, 1912, employing the Spacing of the stitches along the sides 99 rotarystitch-forming mechanism comprisand around the e velet-end of the buttoning a laterally 'ogging needle performing hole. butwhi'cli was liable to produce a more .40 two reciprocations for'each rotation of the or less defective bar at the narrow end of main-shaft and cooperating in' the producthe buttonhole by reason of variation in the tion of stitches with oppositely reciprocattiming of the needleflogging movements in'g loopers mounted upon and movable with withthe' lateral throw of the work-holder I "a'c arrier performing rocking movements of, in passing from side-stitching to barring 45 one-half the frequency of the needle recipconditions; It is one of the objects of the roc'ationsx present improvement to remed this defect According to the present improvement; in and to insure absolute precisifm of timing 100 its preferred form{ the turning movements ofthe fQBCllngIflliCl neeclleogg ng devices at of the stitch-formingmechanism and the this critical point: and this is ,effccted 50 feeding movements of the work-holder relapositivelv timed actuatingmeans'tor such ice .tivelv t'o the-latter are derived from a feeddevice's each deriving its operative movewheel having peripheral gear-teeth mesh ng ments from the main-shaft.

with apinion which rotates with a periph- In the accompanying drawings, Figurel is 1' machine embodying ments.

a rear side elevation of a buttonhole sewing the present improve- Fig. 2' a plan, of certain portions thereof verse section of the base of the machineframe with the .feediiignieclianism represented inelevation. Fig. 4 is a front end elevation of the needle-actuating means, and Fig. 5 a similar elevation... upon a larger scale, of the looper mechanism. Fig. is a bottom view of the feed-wheel. Fig. 7 is an enlarged plan view of the feed-wheel actuating device. Fig. 8 is a diagrammatic view representing the method offorming the bar at thecompletion of the side-stitching, and Fig. 9 a diagrammaticview showing the finished end portion of the buttonhole. v The machine is shown constructed witha frame comprising the hollow rectangular base 1 fromwhich rises the holloiv standard 2 from the upper portion of wh'ch extends theibevel-pinion -main-shaft 5 formed lation with a circular the tubular arm 3 terminating in the hollow head 4. Journaled i with the cranks 6 con nected by the pitman 7 with similar cranks 8 of the upper shaft 9 journaledin the tubular arm 3. g-Fixed upon the main-shaft is the hub 10 of 11 meshing with a similar pinionfll2 upon the short shaft 13 journaled in a suitable bearing of the cross brace-member 14 "of the L upper end the disk 15. The disk 15 carries .two' diametrically opposite and eccentricallv disposed stud-pins 16 secured within suitable apertures of the disk by means of crosspins 17. J ournaled within a suitable bearing of the brace-member 1-1 and in a bracket-member 18 depending from the top of the base 1 is a shaft 19 having fixed thereon the hub 20 of .;the driven wheel or member 21 which is formed with the peripheral gear-teeth 22 constituting driven elements adapted for engagement with the driving pins or elements 16.

As represented particularly in Fig. 7. each of the gear-teeth 22 has a straight inner or active portion 7) arranged intangential reclined at an angle with a radial line passing through said tooth: and the adjacent edge of the next tooth has a straight inner por tion parallel therewith and joined with its circular outer portion by an intermediate curved portion 0 concentric with the outer portion. of the first-mentioned tooth. The spacing apart of the concentric or dwell-producing portions and straight or active portions oi the adjacent teeth corresponding with the diameter of the driving. studpins it? As illustrated IT) Fig. ,7. thedriving member 15is designed to turn in including the feeding mechanism and lts actuating means, and Fig. 3 a*transwithin the base is thebase 1 and carrving upon its .ments with intermediate outer portion 0 and in clockwise direction, the stud-pin or driving element 16. "at the left being active in imparting a driving impulse to the driven member 21. stud-pin enters the outer concentric or dwell-producing portion of the cam-recess between the teeth 22, the other driving element is just emerging from the adjacent cam-recess, but still maintains contact relation with the outer tooth.

In the continued movement of the member pai't of the intermediate As this 15, the left-hand stud-pin continues its advance within the cam-recess or interdent-al space until it reaches the straight or active portion of such recess, as represented in Fig. T. at which instant the other stud-pin reaches the flattened peripheral portion (Z of the intermediate tooth which is cut away for clearance so as to avoid conflict in the advance of the until now stationary driven member. In the further movement of the left-hand stud-pin in its circular path, it en counters the straight inclined active portion .1 of the tooth which it engages and impels it in the same direction in its inward nio'vement along such straight edge and then out-- ward to the point of tangenc of the straight portion with the outer circular portion a at which point in the rotation of the driving member'the other stud-pin enters the adja cent cam-recess.

As the second of these stud-pins moves along the concentric cam-recess, the first remains in contact with the intermediate toot 22 which is held locked against circular movement between the two stud-pins for a substantial portion of a rot-atiomof the driving member 15 and until the second of the'stud-pins reaches the straight inclined or active part of the camrecess at which point the first of the studpins recedes from its respective tooth. as previously described.

The operation above described is repeated for eachsemi-rotation of the driving member corresponding with each lateral moveportion of its respective ment of the needle. whereby the driven memher is caused to perform two advance movepositively timed dwells for every rotation of the driving member. As will be observed. the relative duration of movement and dwell of the drivenunember in each engagement of its teeth by the driving elements 16 is determined by the length of the circular arc of the outer portion 'of the tooth which is adapted to assume concentric relation with the shaft 13 for the dwell-producing period which continues while both driving studpins remain in contact therewith.

While the mechanism disclosed herein is constructed for rotation in the direction above described, it is found in practice that.

it ma be operated effectively when the driving member is turnedin the reverse direction. The transmission of intermittent movement from the driving to the driven member'is in any case effected entirely without shock or harsh engagement of the interenga 'ng, parts, and the mechanism may thus e driven at high speed Without noise or ex essive wear. i i v As represented in the drawings, the shaft 19 has fixed thereon above the driven memher the hub 23 of a pinion. 24 meshing with e peripheral gear-teeth 25 formed upon the rim of the feed-wheel 26 which is suitably (zed-wheel is shown formed in its upper face with the feed cam-groove 27 and'the sideshift cam-groove 28. and upon its lower face with the stitching mechanism turning camgroove'29. The feed cam-groove 27 is en- 31having its 'hub 32 fulcrumedupon the The lever 31 is formed with a groove in which is adjustably secured the upwardly 5 extending stud-pin 34 projecting through an opening 1 in the. 'base.- The side-shift cam-groove 28 is entered by a stud 35 upon :one arm of a rock-lever 36 fulcrumed intermediate its ends at 37 nd carrying at its opposite end a stud 38 hich is pivotally and slidingly connected,

a manner well known with the workolder cross slide-plate 39. The slide-plate 39 is movably sustained upon transverse guidewa'ys of themain' slide-plate 40 which y i formed-at its rearward end with the trans ve seslot 41 entered by the stud 34 from w ich it derives longitudinal feeding movemipnts.

4'0 The cross slide-plate carries the usual clhmp-plates 42 affording the lower worksupporting members of the work-holder utpon' which the work is clamped by the feet 43 of the clamp-arms 44 sustained by the 45 brackets 45' which are secured upon the clamp plates 42, all as represented more fully in my pending application Serial No.

693,778, filed February 29, 1912.

Asset forth more-fully in my application Serial No. 865.446, filed October 7 1914, the

needle-bar 46 is journaled in'the fixed bushing 47 in the upper member of the bracketarm' head 4 and is slidingly fitted within and splined to the re L-ary bushing 48 which is journaled in the lower member of the bracket-arm head. The needle-bar is provided upon its lower end with'a yoke 49 having a cross-pin 50 upon which is slidingly mounted the slide-block 51 carrying the eyepointed laterally jogging needle 52,

The needle-bar has fixed thereon a'collar' 53 carrying the lateral stud 54 which is embraced by one end of the pitinan 55 whose opposite end embraces the crank-pin 06 upon the crank-disk 57 carried by the actuating 'urnaled within the machine base 1. The

tered by a stud 30 depending from a lever stud screw 33 depending from the bed 1.

. ments from the main-shaft 5 through op'erav bearings of the bracket-arm.

Shaft 58. The Shaft 58 is driven by t e shaft 9 through a trasnmelgconnection coin-l prising the disks 59 and 60 inountedjupon a 1 the respective shafts and provided ith the 1 usual pin and cross groove c ectioii, through which the shaft 58 derive tations for each rotation oftl eshaf 9. i I

The needle-carrying block 51 is p with a lateral stud-pin 61 adapted" its lower position to move in oneiof two parallel Ways of the-guidearm 62' secured upon and dependingnfrom the block 63 sustained by the rotary bushing 48, andwh'en id in its upper position to be engaged by the forked depending arm 64 of'an elbow-lever fulcrumed by means of the's'tud-screw'65 upon the block 63 and provided with a lat w 7 eral arm 66 carrying the studq67.

The stud 67 enters a circular guidinggroove 68 in the ring 69 having its hub 7 0 block receives lateral jogging movements ,upon its supporting pin 50fc'f one-half the frequency of the needle-bar reciprocations: 100 As represented more fully in my said PatentNo. 1,030,046, upon a suitable mem ber 78 of the base '1 is journaled the rotary cloopensupport 79 having the dependingbushing 80 and carrying the fulcrum-pin 81' 05 upon which is mounted the-rocking loopercarrier 82 sustaining the eyed looper '83 and I the forked looper 84 and its overlying f spreader 85. The looper-support also sus-" tainsthe loop-detainer 86cooperating with the eyed looper 83 in the handling of thelower thread. The loopersspreader and loop-detainer derive their "operative move tive connections including the telescopically airanged tubular rods 87 and 88 passing through the bushing 80. A

The cam-groove 29 is entered bya rollerstud 89 projecting from the bar 90 which is secured upon the slide-rod 91 mounted in bearings within the machine-base and; connected by the .upright' bar 92, the forked" plate '93 and notched collar 94 with the upper slide-rod 95 sustained 1n su1table""1-25 The'bar 91 carries'at its'fo'rward end the rack 96 meshing with-thepinion 97 fixed upon the l0opersupport bushing 80, and the f rod 95 is connected at its forward end with 1 v the rack-bar 98 slidingly "jo urnaled with-in secured upon 13116 IGGl TOCEltlIl I'Od (1 which a suitable bearing of the bracket-arm head and having rack-teeth meshing with the pinion 99 fixedupon the rotary needle-bar bushing 48. The movement of the slide-frame, comprising the rods 91 and 95 and the connecting members 92. 93 and 9i. under the influence of the cam-groove 29; thus causes the rotation of the cooperating upper and lower forming and feeding mechanisms, but these stitch-forming elements in a manner well known. I

Themachine comprises as usual clampopening and closing devices and spreading means, a slit-cutting device with actuating means therefor, and a stop-motion for controlling the period of action of the stitchare not specifically described herein as they form no part of the present invention.

When the machine is at rest. the workholder and the stitchforming mechanism are in initial side-stitching relation. Upon the starting of themachine. the work-holder is closed upon the work and the button-hole slit is cut in the usual manner after which the stitching is initiated. the first needlethrust being invariably within the narrow end of the slit and the succeeding thrusts throughout the edge-stitching operation being alternately in the work and in the slit to form the side stitches stitching the work-holder receives first a V I step-by-step rectilinearmovement up to the stitch-formingmechanism performs a semisemi-circular portion ofthe eye.

. completion of the eye, the rectilinear length groove an equal lateral or full-step moveeye portion from which point it continues lengthwise of the slit and'receives also slight side-wise step-by-step movements while the rotation "for spacing the stitches around the At the wisefeed is performedin completing a second side st tching operation.

As the needle rises after performing itsfinal depth thrust in the material at the end of the second side stitching operation, it

performs its usual lateral movement while the clamp simultaneously receives through the influence of the side-shift feed-cam ment in the opposite direction while the final full lengthwise feed-step is given to a the work-holden thereby positioning the needle in an initial depth-stitch thrust for production of the initial barring stitch t extending from the outer-line of needle punctures on the second side of the buttonhole to that of the opposite side of the latter. a

While/the reciprocating and lateral jogQ ging movements of the needle cont1nue.-the

During the the intermediate thrusts withinthe work in a line crosswise of the slit to form' theintermediate barging stitches t, the thrust within the slit succeeding the depth-stitch puncture opposite the initialdepth-stitch puncture of the bar being within the end of the slit after which a succeeding depth-stitch puncture is made coincident with the final side-stitch depth puncture which is succeeded by a puncture within the slit followed by a full step jog of the work-holder in the same direction asthe final needle-jog, and in the same directionas the preliminary side-shift movement at the beginning of the barring operation, the progressiye step-by-step lateral movement of the work-holder having i continued for a distance equivalent to'the distance, apart of the outer lines of punc'v tures of the side stitches at the smaller end of the slit. t

The work-holder occupies initially a cen-" tral position in wh1ch the work receives the l slit-and both lines of side stitches between feed-wheel initial and final lateral jogging "the eye and the end of the slit. and in they barring operation it thus derives from the movements in the same direction; the initial simultaneously with the final jog of the needle to slit-stitch position ready to'begm a new cycle of operations.

A series of steps. 'byestep movements intermedlate the said' initiala'nd final jogging movements are performed in adirection opposite thereto and aggregate in length said initial and final jogging movements. By this 1 means the work-holder is moved from initial position to bring the outer line of needle-punctures of the first line of side stitches to the normal slit-stitch position of the needle. and oppositely to a point beyond and atthe same distance from the initial position. after which it is returned to initial position at'the' conclusion of the barring operation.

The depth-stitch punctures in the production of the bar may be made in a straight line crosswise of the dlrection of lengthw se feed sufliciently beyond the small end of the. slit to prevent liability of pulling out of the central barring stitches laid substantially lengthwise of the slit. but they are preferably made in a convexly curved line. as represented inFigs. S-and so as to make the line of needle-puncturesslightly curved but with thestitches drawn up in a substantially straight outer' line when set. ow-- ing to the slight yielding of the fabric. This may be accomplished byproducmg a slight progressive to-and-fro step-by-ste-p longitudinal feed during the laying of the barring stitches.

When the working position of the needle working'position o tion by slight longitudinal and lateralmove r operation,

l the heginning of the first side "period".

nectionbetvveen feed-Wheel actuating mechanism and the ments of the work-holder in such part 0 the stitching operation, the feed-cam grooves being shaped accordingly in the present machine, as represented in the drawings.

In the control of the longitudinal and lateral positions of the Work-holder and the circular positions of the stitching mechanism for the several stages of the stitching opera tion, the effective v cam-grooves are represented in Figs. 2 6 by the reference characters 27 28 and 29 for the first side stitching period; by .the charactersQT, 28 and 29 for the eyestitching period; by the characters 27 28* .and 29 for the second side stitching period;

and by the characters 27*, 28* and 29 for the barring period. As Will be observed, the

feed-cam groove 27 and the side-shift. camg'roove 28 have their principal active por tions at 27 27 28 and 28 respectively, while the usually concentric portions 27 and 28, respectively, are symmetrically bowed slightly to produce slight lateral movements of the work-holder to supplement the relative lateral movement of the Working position of the needle at the semi-circular porthe eye, as before described. The

parts 27* and'28 of the feed and side-shift cam-grooves are made jagged so as to produce jogging movements of the Work-clamp in different directions to supplement the needle-jogging movements as descr1bed in the laying of the barring stitches succeeding the first radially of the smaller end of the slit. It willbe seen that the actuating mechanism of the control 'ng cam-wheel 26 for determining the operative movements of the work-holder and the turning movements'o the stitching mechanism plays an important part in. the precision of operation of the machine and the quality of the stitching, es pecially at the d ofthe buttonhole,

barred en as it is of importance that the in tial arring stitch shall be laid with precision at the secon side-stitching of the v and that the initial side-stitch he slit at uncture shall be invariably in t stitching completion described herein, the conl 21 of the I -hown .anc

the driven whee ,feedwvheel.

portions of the respective feet uniformity and in perfect mechanism is preferably given the successions cam-grooves 0 invention,

produce only a single speed of movement 0 tively to'the stitch-forming mechanism :for Y fixed number of stitches "for but it is obvious that production of a each buttonhole";

tween the pinion 24A and teeth 25 of the for variation in the speed of rotation o In the machine as thus described, the 'feed-' ing movements communicated to the. work 1 holder comprise longitudinal step-by-stepmovements for spacing the side stitches and transverse step-by-step movements which contribute to the positioning of the eye stitches and-the barring stitches. These different successions and begin and end in an initial position 0 the Work-holder, are individually of such lengths and so timed relatively to .t operative movements of the needle puncture of located with great, precision, whereby .the button-holes of a series are made with persymmetry.

of step-by-step movements continue throughout a stitchformihg cycle,

the entire buttonhole-is 0 The feeding mechan sm of the present 1m I provement is designed more particularly for .1

employment in connectionwith an endvvise reciprocating and laterally jogging needle.

vvith cooperating loop taking means, 18 evident thatin certain aspects of the invention' it is applicable to machines em-. I

ploying' other types of over-seaming stitch-. forming mechanism. "\Vith any over-seaming mechanism a step-by step semi rotation in one direction in the stitching of the semi-circular portion of the eye and a step-by step semi-rotation-in opposite directior; in the stitchin of he bar,

0 feeding movements being performed mediate the semi-rotationsof the stitchforming mechanism;

As thusdescribed, to perform the stitching ope-ration after the cuttingof the slit, and to produce the bar,- ring stitches subsequently tothe second side stitching period,- but it is evident that the order of the slit-cutting action ring ma of the class of is designed within the scope invention. It is also evident Wheel. actuating mechanism and described, as also the character 0 f the feed-wheel, may be con--- departure froimjthe work for which the mach ne 1 of the 'present that the feedsiderably varied Without invention.

Having what I claim herein is'- 1. In a combination with 5th ch-fornii'ng ID echanisni,

but it type of.- the stitch-forming 1 05 the.

longitudinal step-by-step I.

the machine is adapted j a p and the ,bar-

v be modified to suit the requirements" herein shown" JV thus set forth the nature the buttonhole sewing machinegthe- 70 change gears may be readily interposed be- 3 the peripheral gea'rfeed-Wheel so as to provide f the oi Ieedmg mechanism including a rotary shaft, a ,work-holder, and means connected with said'shaft for producing between the stitch-forming mechanism and the workholder in each rotation f said 'rality of ,positively limited work-advancing movements with intermediate dwells of definitely fixed duration.

2'. In .a buttonhole sewing machine, in combination, a reciprocating and laterally jogging needle and cooperating loop-taking means, a work-holder, a.'feed-yvheel, connections between the feed-wheel and the workholder for imparting to the latter asuccession of longitudinalfeeding, movements followed by to-and-fro lateral movements, and actuating means" for imparting to the feedwheel step-by-step rotary movements of a frequency and amplitude in fixed relation with the jogging movements of the needle.

3. In a buttonhole sewing machine, the combination with stitch-forming mechanism including a reciprocating and laterally jogging' needle. a work-holder. a feed-wheel.

connections between the feed-wheel and the work-holder for imparting to the latter a 'sruzcession of longitudinalv feeding movements .forthe side-stitching operation followed by a succession of lateral movements tween the feed-wheel and the stitch-forming -mechanism for imparting to the latter progressive rotary movements intermediate the initial and final lateral movements of the work-holder. and actuating means for imparting to the feed-wheel step-bystep rotary movements of a frequency and ampli- .tude in fixed relation with the jogging movements of the needletwhereby the initial and final lateral movements of the workholder are effected, respectively. in opposi tion to, and in the same direction as. simultaneousl timed lateraljogging of the needle.

4. In a buttonhole sewing machine, thecombination with stitch-forming mechanism including a reciprocating and laterally og- 'ging needle. a work-holder. a feed-wheel.

connections between the feed-wheel and .the

. the stitch-forming work-holder for imparting to the lattera succession of longitudinal feeding m0vements for theside-stitching operation followed by a succession of lateral movements ofv'ariable ength during the barring operation. connections between the feed-wheel and mechanism for imparting to' the latter progressive rotary move ments' intermediate the initial and final lateral movements of the work-holder. and actuating means for imparting to the feedwheelstep-by-step rotary movements of a frequency and amplitude in fixed relation with the jogging movements of the needle, wherebv the initial and final lateral movements bf the work-holder are effected, re-

shaft a plu-* lncludlng a work-holder for work-holder, and actuating n the barring operation. connections bemovements spectively, in opposition to, andin the same direction as, simultaneously timed lateral ogging movements of the needle.

' Ina but-tonhole sewing machine,-the combination with stitch-forming mechanism reciprocating and laterally jogging needle, a work-holder, a feed-wheel,

connections between the feed-wheel and the succession of longitudinal feeding movements in the side-stitching operation followed by a series of imparting to the latter areduced feeding movements and a succession of, lateral movements I of varying amplitude within the period of reduced feeding movement, connections between the feed-wheel andthe; stitch-forming mechanism for imparting to the latter progressive rotary movements during said period of reduced feeding movement of the means for imparting to the feed-wheel step-by-step rotary movements of a frequency and amplitude' in fixed relation with the jogging movements of the needle, whereby the initial and final lateral movements of the workholder are effected, respectively, in opposition to. and in the same direction as. simultaneously timed lateral jogging. movements of the needle.

6. In a buttonhole sewing machine, in

combination, stitch-forming mechanism including a reciprocating and laterally jogging needle, a work-holder. means for 1111'- partlng to the worl l1older longitudinal feeding movements for spacing the sidestitches. means acting atthe completion of the side-stitching period for imparting to the work-holder in the production of barring stitches initial and final lateral jogging movements in the same direct-ion. said movements being. respectively. in opposition to. and in the same direction as. simultaneously timed ogging movements of the needle. said means acting further to impart step-by-step lateral movements to thework-holder intermediate and oppositely to the initial and final lateral jogging movements. and means for imparting [O the nism step-by-step turning movements intermediate said initial and final lateral movements of the work-holder.

T. In a sewing machine, in combination, stitch forming mechanism. a work -holder. nd means for producing relative feeding .inovements between the stitch-forming mechanism and the work-holder and comprising an actuating member having a circular se ries of teeth. and a driving member thereforprovided with a plurality of successively acting combined driving and holding elements each adapted to positively engage one of said teeth and acting through itp hold the actuating member against rotation'iintil the succeeding driving element assumes active relation with its respective tooth.

stitch-forming mechacular series ofteeth, therefor provided with a plurality of driving 8. In a. sewing machine, stitch for'ming mechanism, a Work-holder, and means for producing relative feeding movements betweenthe stitchforming mechanism the work-holder and comprising an actuating member having a cirand a driving member in combination,

elements acting successively upon said teeth eachto produce driving impulses and intermediate holding ac ions ezttending each of the driving and operated to impart solely prising an i stitch-forming mechanism,

through a snbstantial'portion of member,

9. In a sewing machine, stitch-forming mechanism, a work-holder, and means for producing relative. feeding movements between thef stitch-forming mechanism and the work-holder and comprising an-actuating member having a circular series of teeth, and a driving member therefor provided with a' plurality of suc-' cessively acting driving elements arranged by their enagement ,with said teeth alternate driving impulses and positively controlled dwells.

- 10.' In a sewing machine, in combination, stitch-forming mechanism, a work-holder, and means for producing relative feeding movements between the stitch forming mechanism and the work-holder and coma rotation in combination,

cular series of teeth, and a rotary driving member thereforthaving-its axisof rotation within the range of movement of said teeth and providedwith a plurality of eccentrically disposed driving elements meshing with said teeth, A

' 11. In a; sewi combination, a work-holder, and means for producing relative feeding movements between. the stitchformingmechanismand the work-holder and comprising a feed-wheel, alrotary driving memg machine,

I ber provided with a plurality of driving elefor-engagement with said driving movements.

driven member operatively consaid feed-wheel and having a driven elements adapted elements and formed each with dwell'producing nd active portions constantly in positive engagement with at least one of said dr ving elements, whereby the driven member 1s alments and anected with circularseries of 'ternately actuated and locked against rotary movement solely 1-2. In a sewing machine, stitch-forming mechanism, and means for producing relative feeding between the stitch forming mechanism and thework-holder and comrising a feed-wheel, a rotary (tr e-mg mem- E81 provided with a plurality o" m mg elements and a driven member a in combination,

nected with said feedwvhe i cireularseriesmt sacs tion relative to stitchformin actuating member having a an,

work-holder,

by said driving elea work-holder,

gagement by said dr 'ving elements and formed with diametrica ly' opposite concentrle portions adapted to assume concentric relation with the axis of movement of said.

driving member and for'simultaneous engagement by said driving elements.

' 13. In a buttonhole sewing machine, in combination, overseaming stitch forming mechanism including cooperative stitch-- forming elements, means for imparting thereto step-by-step semi-rotations in opposite directions, a main drivingsh aft for the stitch'forming mechanism, and a continuously controlling connection from saidanain-shaft to said work-holder for producing between the stitch-forminga work-holder,

mechanism and the work-holder intermediate consecutive semi rotations of the stitch-forming mechanism successions o feeding movements of fixed length and durathe operative movements of the, stitch-forming elements. iii. In a buttonhole sewing machine, in

' combination, overseaming stitchforming mechanism in I luding a reciprocating needle, means for imparting thereto step-by-step i-rotation. in opposite directions, a maindriving shaf operatively connecting the mechanism, a work holder and acontinuously controlling connection from said main-shaft to said worl -holder for producing between the stitch-forming mechanism and the work-holder intermediate consecutive semi rotations of the stitch-forming mechanism successions of semi-rotations of the stitch-forming. mechanism successions of stitch-spacing movements in fixed length and duration relatively. to the needle-jogging movements, the aggro gate periods occupied in performing such semi-rotations and stitch-spacing movements being co-e'xtensive with the period of opera-. tion of the stitch-forming mechanism.

16. In a sewing machine, in combination, stitch-forming mechanism, a rotating mainshat't. a work-holder, means for producing relative feeding movements between the stitch-forming mechanism and the workholder including driving and driven eleconnection berm constant driving p ting element and-said rotating main shaft, members carriedfby said driving element, complementa-l coactlng members carr ed by the driven element and shaped to permit the imparting of driving lmpulses to said driven member preceded by dwells, said driving element being actuated vfrom said rotatingsliaft throug'lrsaid. con- .stant driving connection whereby 10st motion therebetween isavoided, and said driven element positively controlling the driving element during said dwell.

17. In a sewing machine in combination stitch-forming mechanism, a work-holder,

and means for producing relative feeding movements between the stitch-forming mechanism and the work-holder including driving and driven elements,' pins carried by the dr1ving element and movable in a circular path, and coacting teeth carried by (the driven element, ,said teeth being shaped to permit the pins to" be engaged therewith "without imparting movement for an appreciableintervalv to said, driven member. Ina sewing machine in combination stitch-forming 'mechanism, a work-holder, and means for producing relative feeding movements between v the stitch-forming mechanism and the Work-holder including a stitch-forming mechanism,

driven-member may be interrupted 'rotating driving element and a driven element said elements having coasting surfaces and sa1 d rotating driving element turning on an axls located between two concentric" circles boundmgthe outer and inner exdriven member.

whereby in' operation dwells 19. In a sewing machine in combination,

a.- work-holder, and vmeans for producing relative feeding movements between the stitch-forming mechanism and the Work-holder including a driving member havin a pair of elements and a driven member aving teeth, saidteeth having faces adapted to coact with said pair of elements said elements having an identical path 0 length of a coac-ting face of the driven memher when a driving impulse has been com pleted whereby motion imparted to said by dwell s of definite and appreciable duration.

In testimonyvwhereof, I have signed my name to this specification. i l

EDWARD B. ALLEN.

movement coincident with the.

Images