US869961A - Lock-stitch sewing-machine. - Google Patents

Description

PATENTED NOV. 5, 1907.

H. H. CUMMINGS. LOCK STITCH SEWING MACHINE.

APPLIOATION FILED JUNE 17, 1904.

3 SHEETSSHEET 1.

Zfla'nesses:

( OM F6416 PATENTED NOV. 5, 1907.

H. H. GUMMINGS.-

LOCK STITCH SEWING MACHINE.

APPLIUATION FILED JUNE 17. 1904.

s SHEETS-SHEET 2.

2 a Tif/ Inventor M M fitter-megs witnesses.- (Qma/ F m W.

No. 869,961. PATENTED NOV. 5. 1907. H. H. CUMMINGS.

LOCK STITCH SEWING MACHINE.

APPLICATION FILED JUNEl'I.1904.

3 SHEETS-SHEET 3.

wa'zfnssess fnvhzorz- M v 6 L 3 a W W 015k I y o -orneya UNiTED sm rs s re ress HENRY H CUMMINGS, OF MALDEN, MASSACHUSETTS, ASSIGNOR TO UNION LOCK STITCH COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE.

LOGK STITCH SEWING-BifhCHINE.

Specification of Letters Patent.

Eatented Nov. 5, 1907.

To all whom it may concern:

Be it known that L'HENRY H. Censuses, a citizen of the United States, residing at Malden, in the county of Middlcsex, State of Massachusetts, have invented a certain new and useful-Improvement in LocloStitch Sewing-lvlachines, of which the following is a specification, reference being had therein to the accompanying drawings. V

In the drawings,-Figure 1 shows in front elevationa portion of a straight-needle lock-stitch sewing machine employing a hooked needle, with an embodiment of the invention applied thereto. Fig. 2 shows the parts of Fig. 1 in elevation from the left-hand side in Fig. 1. Fig. 3 shows the parts of Figs. 1 and 2 in plan, with the work-support, awl-b'a-r, and awl omitted. Fig. 4 is a detail view in elevation looking from the left-hand side, as in Fig. 2, but with some of the parts of Fig. 2 omitted. Fig. 5 is a detail view mainly in vertical section on a plane passing transversely through the center of the shuttle at right angles to the lineof feed. Fig. 6 shows the shuttle separately in plan. Fig. 7 is a view similar to Fig. 5 showing a different embodiment of the invention. Fig. 8 is a view similar to Fig. 4 but showing still another embodiment of the invention. Fig. 9 is a view illustrating the application of the invention to a curved needle lock-stitch sewing machine.

Having reference to the drawings,--A portion of a post or standard forming part of the frame-work of a straight-needle sewing machine is represented at 1, Figs. 1 and 2, and at 2 is represented a worlorest or worksupport upon the upper end of the said poster standard 1. 3, in Figs. 1 and 2, is an awl working from above the said work-rest or work-support, and 31 is the aw1 bar carrying the said awl. Only a portion of the awlbar is shown.

4 is an ordinary hooked straight needle working from below the work-rest or work-support, and 41 is the needle-bar carrying the said needle, only a portion of the needle-bar being shown.

The owl-bar and needle-bar, in practice, respectively have connected therewith suitable means for reciprocating the some, and respectively are mounted in guides (not shownfas usual, in which they move lengthwise in right lines.

. 5 is a rotary loop-taker having the working position thereof below the work-rest or work-support, the loop-taking point of the said loop-taker being designated 59 in the illustrated embodiment of the invention the loop taker is a shuttle. The said shuttle is essentially cup --shaped, as shown best by Figs. 5, 6 and 7 it being formed with a large bobbin chamber which is surrounded by a raised annular rim, and being provided within the said chamber with a bobbin-supporting post 51.

52 is a tlu'ead-container, herein a bobbin which 0c ,the shuttle a rotatable disk, or the equivalent thcr 0?.

which is eonnxial with the shuttle, it having a working 100 cupies the chamber and is mount-ed therein upon thesaid post.

53, Figs. 1 and 2, is s. shuttle-driver, and 54 is an upright shaft having the said shuttle-driver attached thereto, the said shaft being mounted in hearings in the post or standard 1. In practice, the shaft 54 has con-' nected therewith suitable means for rotating the same, not necessary to be shown. The shuttle 5 is niounted in a shuttle-race comprising opposite side- pieces 6, 6, and a removable section or slide 61 between the said 65 side-pieces, the edges of the portions 6, 6, 61, of the shuttle-race entering a circumferential groove 55 which is formed in the exterior of the shuttle, and the removability of the section 61 providing for the insertion and Withdrawal of the shuttle.

As thus far described, the parts operate essentially as usual in hookmeedle wax-thread sewing machines. Thus, the owl passes through the stock from one side of the latter to form a hole therein. The needle is passed through the said hole horn the opposite side of the. stock, 7 5 and after having had the needle-thread placed within its open eye by the action of the thread-guide (looper) is retracted, drawing a loop of needle-thread through the said hole. The said loop is engaged by the shuttlepoint and by the rotation of the shuttle is passed around and over the latter, whereby it is interlocked with the shuttle-thread, being then discharged from the shuttlepoint and drawn up to tighten and complete the stitch.

The invention consists in improved means of imparting tension to the shuttle-thread, and holding or locking the same against the pull of the needlethread in the tightening of the stitch. The said means is adapted to be arranged to act (a) continuously with substantial uniformity in the degree thereof; or a continuously and with temporary increase in the degree there of as the tightening of the stitch approaches completion, in order to hold the shuttle-thread at such time against the pull which is exerted thereon by the needle-thread in setting the stitch; or (c) intormittingly, at and about the time of .the tightening of the stitch, the shuttle-thread being substantially free from the action of the tension means at other times.

In carrying the invention into effect, I combine with position in which one radial surface thereof is located immediately adjacent the edge of the rim of the shuttle, and the said surface cooperating with the said edgein compressing the shuttle-thread the latter issues between the edge and the disk. Preferably, the said disk is eon-axial with the loop-taker or shuttle, it may be a separate disk, or it may be one of the heads of the bobbin which is contained within the shuttle. The former construction is shown in Figs. 4 and 5 of the drawings; the latter, in Fig. 7. The separate disk of Figs. 4 and 5 is mounted in working position by means of a central spindle 81, Fig. 5, projecting down- Weird there-from, which enters the central bore of the tubular post 51 of the shut le. lt is supported vertically by annular shoulder thereon t or it may be so engaged with the shuttle as, for by the frictional en agemeot between spind the interior surface of post 5l, as to cause it to remain V to the shuttle. I bobbin is made lar Tim of the upper head 57 projects ovor the w in fixed, or substanti lly fixed, relation with. 7, the upper heed 57 of the gel in diameter than the low r heed 55 and when the bobbin 1's in place in the o1 cavity of th s shuttle'body the marginal po' of the rim of the sluittlo-body, substantially as in case of the corresponding portion of the separate ulSL-K 8 of Figs. 4 and 5. by setting the disk and shuttle in proper relationship to cause the acting surface o1 she disk to approach to Within the disc-note? of the shuttlethread with respect to all portions of the e ge of the rim of the shuttles continuity of tension w 1 be pi'oduced. 'In a case in which the closeness of approach is uniionn around the circuit of the rim of the shuttle the tension of the shuttle-thread will he rendoced unifor o. Bv varying the closeness of approach on point, by means of a swell 01 rise upon the of the shuttle, shown at 7 in i 4 to 7, an Z'ECEEQQSG of tension will occin" as such point passes and acts upon the portion of shuttlethroscl issuing between the disk and shuttle-rim, thereby rendering the tension variable by occasioning a periodical gripping or pinching ol the shuttle-thread between the shuttle-rim 'By setting the shuttle--rim and such relation to each other that t ad shall be free from compression except .i hen acted-11pm! by the swell or enlargement of the shntl-lorim, this periodical action alone may be secure leaving the she til o-thrcsd substantially free f Tom the t it means at other times. This temporary increase o is tension of the slluttledhresd at the time of the final tightening of the stitch term the shuttle-thread The principles which are embodied in the shuttlethi'ead lock are as folloWs:Aftor 3 loop of neodlethread has been enqagcd by the shuttle-point, passed around the shuttle by the rotation of the later, and cast (as from the shuttle, and as the tightening of the stitch advances to completion, the slmttlaiethrcad look ing surface constituted by the swell 01' rise aforesaid, passes the portion of shuttle-tl1read cxtcnding 0*; r the rim of the shuttle from the interior of the latter toward the stitc the stitch. When the locking surface of the shutt.

orming point. The said locking surface presses the said portion of the shuttle-thread in the di-v acts with one of the heads of the bobbin, or another disk which is connected with the bobbin to rotate in unison with the latter, the compression or clamping of the shuttle-thread between the said surface and the said bol bin-lieed, or other disk serves also by arresting mbly, the compressing and clamping action is lding in order to obviate tendency to chafing or cutting of the shuttle-thread, as Well as to render unnecessary extreme nicety and delicacy in the setting o; adjustment of the parts. To this end, in Figs. 4, 5, 7 and 5 a. yielding backing for the disk is provided, the

l ing consisting of a spring 9 in tho formof a bent log, which is attached by one end thereof to, the under surface of the work-support. The said spring downwardly curved portion which makeslcontact he upper of the disk. The tension of the s such as to cause tho disk toico-act with the sur c i to clamp the sh'uttlothrcad with sufficient force to insure the proper tightening of tho stitch under usual conditions, but the spring yields to avoid crushing,

ill

cutting, or chafing of the shuttle-thread between the surface 7 and the under surface of the disk. The tenand curved in its middle portion so as to project above the upper edge thereof. One end of the said spring is fixed to the shuttle-rim, while the other rests freely upon t o top of the said rim.

On Milly, the shuttle-thread locking action will not he sufhciontly pronounced in practice to hold. such thread up to the breaking-point of the latter. I do not noc sm'lly limit myself, therefore, to :1 positive and absolutely unyielding locking of the shuttle-thread.

The invention is equally applicable, either to straight-needle machines, as illustrated by Figs. 1 t0 8 4. the drawings, or to curved-needle machines, as in Fig. 9. In the latter figure, a Work-support is indicated at 111, a curved owl at 112, an oscillating owl-carrier st 121, a curved needle at 113, and an oscillating needlecarrier at 131. At 115 is a rotary shuttle cooperating with the said curved needle in the production of stitches, at 159 the shuttle-point, at 152 the shuttle drivcr, at 154 the rotary shaft on which the said shuttledrlver is mounted," and. at 156 the shuttle-race. The disk cooperating with the edge of 'the ,rim of the shuttle, explained heroinbefore, is designated 118, and st ll? is the swell or enlargement of the shuttle-rim, An elastic or yielding arm, 119, is attached by meansof 2t screw 1201 0 the portion 121 of the machine-framing. The free extremity of the said arm projects in front of the ssh ttle and makes contact Withthe outer side of disk 118 as n. the czxse'of sffrlng 9 oflFigs. 1 to 7. The said so s to retain the disk in place, and constitutes it backing therefor.

l chimes my invention I 1. In a. lock-stitch sewing machine, the combination i s. rotary loop .Jsex having a. source of supply for the ass , with a rotary shuttle, of a rotatable disk soccer locking thread, of a rotatable disk with a radially-extendingface thereof immediately adjacent the edge of'the rimimmediately adjacent the edge of the rim of the shuttle.

the said parts being constructed and arranged. to cause the locking thread to be compressed intermittingly between the said face and edge as it issues between them.

In a. lock-stitch sewing machine; the combination with a rotary loop-taker having a source of snpplyjor the locking-thread, of a-rotatable disk occupying a working position with a face thereof adjacent the edge of the rim port! 11 which acts in the rotation of the loop-taker to compress the iocking thread intermittingly as the-said thread issues between the said edge and face. c

4.111 a lock-stitch sewing machine, the combination occupying a working position with a face thereof adjacent the edge of the rim of the shuttle, the said edge having a clamping portion which acts in the rotation .of the shuttle to compress the locking-thread intermittingly'as the said thread issues between the said edge and face.

5. In a lock-stitch sewing machine, in combination, a thread-container, a loop-take r rotating around said threadcontainer, and a rotatable 'diskwith a radially extending face thereof immediatelyzadjacent the edge of the rim of the loop-taker, the said loop-faker being constructed and arranged to intermittingly compress the locking thread between said edge and said face of the disk in the rotation of the loop-taker.

6. In a lock-stitch sewing machine, in combination, a

thread-container from which the locking-thread extends 1 toward the stitch-forming point in the machine, and a loop-taker rotating around the said thread-container and provided with thread-compression means acting in.the direction of the length of the axis of rotation to intermittingly compress the said thread at a point between the thread-container and the stitch-forming point.

7. In a lock-stitch sewing machine, in combinationfthe rotary shuttle provided with {an intermittingly acting shuttlethread compressing surface which by the rotation of the shuttle is carried past the portion of shuttle-thread extending over the rim of the shuttle from the interior of the latter, and a disk which is con-axial with the shuttle and against one face of which the said portion of shuttlethread is compressedby the said surface as the latter passes, with increase in the tension of the shuttle-thread, to thereby withstand the pull on the needle-thread in setting the stitch. I Y Y 8. In a lock-stitch sewing machine, a shuttle-thread lock comprising, essentially, the rotary shuttle provided with a locking surface which by the rotation of the shuttle is carried 'past the portion of shuttle-thread extending over the rim of the shuttle from the supply within the f the loop-taker, the said edge having a clamping.

latter, and an opposing disk which is conaxial with the latter and against one face of which the said portion of shuttle-thread is pinched by the said locking surface as the latter passes, one of the locking members being yielding 9. In a lock-stitch sewing machine, the combination comprising the rotary shuttle provided with the intermittingly acting compressing surface, the opposing disk, con-axial with the shuttle and against which the said compressing surface is caused by the. rotation of the shuttie to ,clamp the shuttle-thread, and the spring acting in connection with the saiddisk. i

10. In a lockstitch sewing machine, in combination, the rotary shuttle having the rim thereof provided with the swell; and a disk which is con-axial with the shuttle and against one face of which the portion of shuttlethread extending over the rim of theshuttle from the interior of the latter is-pinched by the said swell as the latter passes thesaid'portion of thread, to thereby withstand the pull on the needle-thread in setting the stitch.

11. In a lock-stitch sewing niachinegin combination, the

rotary shuttle having the bobbin-chamber and having its rim provided with the'swell, the bobbin contained in the said, chamber and from whichthe thread passes between the edge of one head of the said bobbin and the rim of the shuttle, and over the latter, and a disk which is conaxial with the-shuttle and against one face of which the portion of shuttle-thread passing over the shuttle rim is pinched by the said swell'as the latter passes, to thereby withstand the pull on the needle-thread in setting the; stitch. 12. In a lock-stitch sewing machine, in combination, a rotary idop-taker, a rotatable disk adjacent the edge of the rim o'f'the said loop-taker, said parts being constructed andarranged to compress the shuttle thread as the latter travels from a central source of supply be tween the edge-of the rim of the loop-taker and the -radially extending face of the disk.

, 13. In a lock-stitch sewing machine, the combination with 'a rotary loop-taker having a source of supply for I 1 the locking thread, of a rotatable disk with a radially extending face thereof immediately adjacent the edge of the rim of the loop-taker, the said loop-taker being constructed and arranged to cause the locking thread to be compressed intermittingiy between the said edge and face.

14. In a lock-stitch sewing machine, the combination with a rotary shuttle, of a rotatable disk occupying a working position with a radially extending face thereof immediately adjacent the edge of the rim of the shuttle, the said shuttle being constructed and arranged to causethe locking thread to be compressed intermittingly between the said face and edge as it issues between them.

In testimony whereof I affix my signature, in presence of two witnesses.

' HENRY CUMMINGS.

Witnesses:

WILLIAM J. TYLER, CHAS. F. RANDALL.

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