US1121655A - Stop-motion mechanism for sewing-machines. - Google Patents

Description

D. NOBLE. STOP MOTION MEGHANISM 'FOR SEWING MACHINES.

APPLICATION FILED MAR.19, 1913.

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s'roP MOTION MBCHANISM ron SEWING MACHINES.

APPLICATION FILED MABJQ, 1913.

1,121,655. Patented Dec. 22, 1914.

'Hr MORRIS PFVERS C0 A PHDTCLLITHrL. WASHINUIUN, r1. t

D. NOBLE.

STOP MOTION MEGIIANISM rox SEWING MACHINES.

APPLICATION FILED MAR.19, 1913.

1,121,655. Patented De@.22,1914.

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' llll illllllllllllllhylll THE NORRIS PETERS C0 PHOTO-LITHD.. WASHINUTQN, u, 1..

uiaiTEDsTATEs-.PATENT oFFLIoE. l

DONALD NOBLE, 0F BRIDGEPORT, CONNECTICUT, ASSIGNOR TO THE SINGER MANU- FACTURING COMPANY, A CORPORATION kOF NEW JERSEY.v 1 y STOP-MOTION MECHANISM non SEWINfar-Maoriinns; ll

T0 all whom it may concern.' l

Be it known that I, DONALD NOBLE, a subject'of the King of Great Britain, residing at Bridgeport, in the countyl of Fairfield and State of Connecticut, 'have invented certain new and useful Improvements in Stop #Motion Mechanism for 4Sewing- Machines, of which the following is a specifi'- c'ation, reference being had therein to thethe actiony of the machine only when form-v` ing an outside stitch, as distinguished from the commonly employed stop-motion mechanisms for arresting the action ofthe machine when the needle is out of the fabric,

regardless of the character of the stitch being formed. f

The present construction ofk stop-motion mechanism is shown and described asapplied to the blind stitch fsewing n iachine.V represented by U. S. patent application Se-A rial No. 660,255, filed lNovember 1114, 1911, D. Noble, and while this particular machine differs somewhat from the vearlier dev1ces,it is believed that sufficient of the details in construction is herein shown to clearly illustrate the application of the presentimprovement.-

v Figure y1 is a viewvin side elevation of' a blind stitch sewing machine and its,` powertransmitting"mechanism equipped with' the` present invention; Fig. 2 a rear end vitw 7of the machine, the machine frame beingl shown inl section tov better illustrate certain details in construction later to be'freferred to, together with a View of the power-transmitting v mechanism shown 1n the previous figure; 'F ig. 3 a viewlooling inthe direction indicated by the arrow t, Fig.' 2,`show ing the machine frame in section, land also showing in sectionl and in full lines certain elements important to an understanding of the prime members of the connections .fory effecting the automatic control of the stopmotion mechanism; and Fig. 4. a plan view' of certain elements 4shown in the previous figures which are important to an under? standing of the manual and automatic control of the stop-motion-mechanism.

, Specincationof Letters'Patent.` Pat'ntedei. 22, 1914. i i Application led March 19, 1913. :Serial No. 755,285. y Y

l represents the sewing machine "frame in which is mountedvin suitable bearings the main shaft 2 carrying at one end-a beltpulley or hand-wheel 3 and at its opposite end a iiange 1. f l

5 is an oscillating cylinder having formed v,integral vwith it a bearing stud 6 mounted in a suitable bearing 7 formed insaidframe,

said stud being held against Vendwise movef ment by suitable nuts (not'fshown)y fittedv vupon the vend of the shaft,

carrying said cylinder. y

-8 represents a needle-carrying bar mounted in the cylinder I5' andhaving endwise movements in` a substantially horizontal plane, saidbar beingprovided at its foropposite L ward end with a` needle-bracket 9 in which` is suitably secured aneye-pointed needle 10, y andcOaCting with said needle is an oscillatfft ing tl'iread-carrying `loop-talmr ll provided "jl ywith thel usual bobbin 12 and withasuitable v A hook shaft (not shown) having oscillatory .i

movements'in the same plane as vthe stitch;

forming movements of the needle-bar, 'thev latter and saidj hoolnshaft being operativelyy connected,V through suitable connections,

. with al pitmanl connectedbyacrank 14 carried by the lflange 4 securedyupon the mainfshaft'. ,v l l From the foregoing it is to be understoo that through the shaft-"flange land its pitstitchesyf l i. i Asis `well "understood, fin `the formation `man 18, horizontalv movementsfare trans-l "if" 'mittedtothe' needle-bar 8 and oscillatory moirements to. they loo'p'-talrer 11:tofform` 9,0

ofy a blind stitch seam Ithe -needle passes alternately through fand outside of thelfab`' ric, and when piercing the fabric entersand emerges 'from thesame side thereof, andithis inthe present instance is accomplished by giving to the cylinder a` rocking ymove'- ment with respect to the plane of the fabric beingk stitched. v f.

Upon the maln shaftQ is secured ais-gear f 15 which vvmeshes with a gear 16 carried by lthe feedactuating vshaft f 17, and as If-s'aid'4 gears areV of the-ratio of two to one, the

vshaft 17 f is given one rotation t'otworota-fA` tions of the shaftQ; Secured to thepforw'ardry end of the shaft 17 is a feed-disk 18 *provided with anadjustably secured connection if 19 which cooperates with a suitable friction;y pawl and disk (not shown) secured upon the` feed-sha'ftQO, and Vupon the end 21of-the1 shaft 17 is" secured a iange 21 in which isi; y

v mesheswith a gear 27 carriedby an oscillat ing yfeed-'shaft 28, upon the free end of whichfare secured serrated rotary feed-disks 29 andf130, lthus transmittingstep-by-stepffeed movements tothe disks 29 and 30,

secured a'pin` 22 with its axis eccentric to that of said shaft, and swiveled on said pin is a blockl23 'which works in a groove 24 formed in an' extended portion 25 of fthe y'oscillating' cylinder 5, whereby oscillatory movementsy are transmitted to said cylinder to vcause the stitch-formingl mechanism to place stitches' alternately in and outside of thefi'fabric.l 'Upon the endof` the rshaft 20 oppositethat carrying' the feed-disk (not shown)v is secured a` bevel gear 26 which y.throughthe feeding elements described.

' l y fabric, ridgefforniing blade 34. Mounted in.' suitablebearings formed inl the frame 1 is a horizontally arranged shaft 85 having selcureduponone end a rock-lever 36, one end Afroclclever 31 is pivoted upon a shaft'32 mounted in the frainel and provided at its 4vforward end kwitha pin l33which .enters va suitable opening in the lower end of the Qf'whichcoacts with an eccentric 37, carried vbytheflange 21, which enters av suitable slot.v (not shown) formed in vsaid lever, the

.rotatiouofsaid eccentric'rcausing said lever i to berocked upon its fulcrum. The opposite" end 'oifA theA rock-lever 36 is divided and provided-with oppositely arranged bearings, as

38, in p which is trunnioned a short shaft 39 through which passesa standard 40y secured at itslower endy on a rock-shaft 41 carried by:therockfleverfh said standard being. `threaded at itsv upper end to receivean adjusting nut l42r provided with a slightly tapered threaded portion 43. upon .whichV is,A threaded. asecuring nut 44, the nut 42'be'ing ',plOVd'ed .withfa depending vportion 45. Thus itwill be vseenthat' through theadjust- "ment .of the nut 42, vertical adjustment .not

thefridgeorining bladeis eected when, fior., any purpose, vit is desired to change the operative 'relationship of the upper end of y fsaid blade with respect to the line of needle vactuation, aspring "46 seatedat itsv lower enden .the hub 47 ofy the standard 40 land having its upper end in contact with' the vinnenend wall ofthe housing 48 threaded intothe frame 1 normally acting to hold y sition.

"said,ridg'e-i'orming bladelinits elevated po- The shafts 20 ,and 28fare mounted in suit? able bearings formed inthetransversely larcured by pinch'screw 51, one end of a, lever 52,thefopposite ,end OWhich ispivotally ed tapered portion 56 provided with a securing nut 57 andinounted upon" the rod 53 is aspiralspring 58 thev upper end of which contacts with the .inner wall of the housing 54 while its lowerend is seated upon ya collarl secured upon said rod, thus through vvthe action ofsaid spring the feed-disks-QQ `and are .resiliently -held in their elevated or eiective positions with respect to the fabric being acted upon.

The cloth-presser comprises uprighty threaded portion 60` provided at itsvlower" i end with va* suitable cross bar4 (not shown), kto which is pivoted by suitable screws, as 61,

the swinging. presser-footi62. The portion l60 ypasseslthrough a vertical tubular portion- 63 formed integral with ahorizontal arin64 slidably y mounted in a suitable tubular'opening (not shown) in a bracket 65 secured .upon

` the cylinder 5,-a suitable spring (notshown) I' i locatedin` the tubular portion 63 and sur-v rounding the upright portion .60 acting to'v hold the presser-foot 62 down upon the4 fab-k ric. y'lkhe horizontal arm 64 is -rree to oscillate in lthe tubular bearing formed in rthebracket 65, its. movement in the direction of its length beingin opposition to v-`the re? siliencyv of ka suitable springy (not shown.)

mounted',` on a reduced. portion (not shown)` locatedv withinrthe opening in said bracket @65, saidspringfbeing-held conlined within said opening by a nut 66.

' The machine is operated from the source of. power through a suitable power` `transf nntter 'depending' from the underside ofthe sewing machine table, which comprises ka power transmitter bracket 67 in which is,y secured a pulley-shaft 68 providedgwitha tight pulley 69 and loose pulley 70, the Ipulley 69 4beingprovided with a washer or` friction `element 171. A ysuitable 'ebeltr (not with the"beltpulley or handwheel 3.". l -72 represents a `brake-llsmtuating leverand 'element' or shoe 74 which, atthewill of the operator, coacts withthe tight pulley 69, to arrest the action of the machine,` the levers 72 and 73` being fast on afshaft`75 vhaving icc . .11e .v 73 a brake lever, the lattercarrying' a Abrake i rockingsmovements 'in suitable bearings loy f i catedin `the bracket 67, 'a spring 6 normally actingy to hold said brake'ghoe in ,Contact v withjthe pulleyv 69.y i

7 7 represents al poweretransmitting lever, one end or'l whichis secured upon the shaft 7 5,'its opposite end 78 being provided'with izo an inclined` surface 7 9 which," when the i brake shoe 74 is manually moved away from .the pulley 69, acts "on the end of the .short `shaft to move the loose pulley 70`into en- 1 gagement with the friction washer 71,- thus;

effecting4 audriving and' driven relationship between said.. pulleys.

To manually 4 eect the downwardy y adjust` ics- '.shown)l acts to connect the pulley70 withj the sourcelof power, anda like connection, .(notjshown) acts to connect the pulleyv 69` l ment 'of the treadle 81 in the direction indiment of the feed-disks 29 and 30 vand blade tight puiiey 69.

34, as when placing the fabric into or out of 'operative relationship with the stitch-formn attached to a collar 82 which, in turn, is secured upon a tubular rod `8K3 provided at its upper end with a cross bar 84 which, when moved vertically through a rocking movecated by the arrow u, or in a direction opposite that for starting the machine, contacts with a forked arm 85 of a bracket 86secured by screws 87 upon a rock-shaft 88 mounted the levers 52 and 31, respectively, and in the further movement of said'rodssaid levers are rocked upon their fulcrums to position the feed-rolls 29 and 30 and ridge-forming blade 34 in their lowest or fabric-receiving positions. y

The starting of the machine is effected by a movement of the foot treadle in a direction opposite that indicated by the arrow u, which causes the lower end of the tubular rod 83 to depress the outer end of the brakeactuating lever, thus releasing the brake 7 4 and moving the incline 79 to force the loose pulley into driving engagement with the To arrest the action of the machine only at alternate stitches, orfwhen forming the stitch placed outside vof the fabric, there is provided a rod 92 whichvisvpivoted at itsl provided with an enlarged .portion 93 and shoulder or step 94, from which latterfeX- i tends upward a 'guidingmember 9,5.l During the operation of the machine the shoulder 94 is fheld slightly below the under surface of the releasing levery 96 mountedupon a fulcrum pin 97 threaded into the base l,

foot treadle, when said shoulder is moved into contact with the underside ofthe lever y p needle is actuated to form stitches only in a n 96, where it remains until released by the brake shoe 74 into contact withethe tight y pulley 69, andthe incline 79out ofv effec-y tive` engagement with the short shaft 80. rIhe vearn` 98 is positioned so that it acts on the roller 99 only when an outside stitch is being formed, fthe eifective action. of the brake shoe thus vbeing coincident with the formation vof an edge or outside stitch. I claimy,

1. vIn a sewing ymachine provided with a thread-carrying needle having stitchforming movements ina path intersecting the fabricbeing acted upon and in av path outside` of said fabric, the combination with power-transmitting mechanism for-transmitting power from the supply to the machine, and a stop-motion mechanism for arresting the action of said machine, of means under lthe control of the operator for interrupting said `transmission of power and bringing said stop-motion mechanism into action, and automatically controlled means for preventing the effective action of said stop-motion mechanism except when rthe needle is actuated tov form an outside stitch.

2. In a sewing machine provided with a thread-carrying needle having stitch-forming movements in a substantially horizontal plane intersecting the fabric being acted upon and in a substantially horizontal plane outside of said fabric, the combination with power-transmitting mechanism for transmitting power from the supply to the machine, and a stop-motion mechanism for arresting the action of said machine, of means under the control of the operator `for interrupting said transmission of power and bringing said stop-motion mechanism into action, and. automatically controlled means for preventing they eective action of said stopmotion mechanism exceptl when the needle is actuated to form an outside stitch.. `In a sewing` machine provided with ai thread-carrying needle having stitch-forming movements in a substantially horizontal plane intersecting the fabric being acted upon and in a substantially horizontal plane outside ofsaid fabric,'the combination with power-transmitting mechanism for transmitting power from the supply to the mav chine, `anda `stopmotion mechanism for arresting the actionof said machine, of means under the control of the operator for interrupting said transmission of power and bringing said stop-motion mechanism into until the operator relcasesher controlof the.` action, and automatically controlled fmeans given plane. y

i `In testimony whereof, I have signed my ynametothis specification, in the presence of two subscribing witnesses.` 1

DoNALnNoBLri.

Witnesses:

THOMAS CAMPBELL, y W. CUTTING.

Copies Vof this patent may he obtained `for kive cents each, by addressingthe Commissioner'of Patents,

' i Washington D. C."

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