US817475A

US817475A - Sewing-machine.

Info

Publication number: US817475A
Application number: US19866604A
Authority: US
Inventors: Ernest Frederick Durand
Original assignee: Individual
Current assignee: Individual
Priority date: 1904-03-17
Filing date: 1904-03-17
Publication date: 1906-04-10
Anticipated expiration: 1923-04-10

Description

No. 817,475. PATENTED APR. 10, 1906.

E. F. DURAND. `SEWING MACHINE.

APLIOATION FILED MAR.17.1904.

Nmlf/AJ/.r PATENTBD APR. 10, 1906. E. P. DURAND.

SEWING MACHINE.

APPLICATION FILED 1411.11.17, w04.

SSHBETS-SHEET 2.

Mes e gwen/for, www@ y MQf/@Z/ /M/ yy PATENTED APR. l0, 1906,

E. F. DURAND.

SEWING MACHINE.

APPLICATION FILED MAR,17,1904.

3 SHBETSSHBBT 3.

ff/Lyenr lmuD/@WM 577 UNITED" STATES PATENT OFFICE.

Specification of Letters Patent.

Patented April 10," 1906.

Application filed March 1*'7, 1904. Serial No. 198.666.

To LZZ 1071/0711/ it `mcty concern/.V l v Be it known that 1, ERNEST FREDERICK DURAND, a subject ofthe King of Great Britain and Ireland, and `a resident of London, England, have invented new and useful Improvements in Sewing- Machines, of which the followingis a specification.

This invention relates to an improvedcon-` struction of double-chain-stitch sewing-machine for the production of overseam-work;

`and it has for its objects to enable an overstitch to be `formed that shall be tighterand of better appearance than that hitherto proy duced and in which the needle-loop shall be drawn up almostto disappearing pointon the under side of the fabric; to increase the strength of theseam, so that it shall not gape V or show `a f and stretched; "to avoid damage to the thread while stitching is taking place, and to economize the needle-thread. Thisv typeof grinning stitch when opened machine `is particularly adapted` for sewing sacks, although suitable for other purposes.

The sewing-machine of my invention is mainly characterized by a looper arranged to rockin a verticalplane and adapted to enter and carry its thread through the needle-loop formed underneath the work and then present its own thread sidewise above the work to a s reader, oscillating in a practically horizonta plane and taking and spreading such loop over the work until it is extended be-` yond the path of the needle, and so permit the latter, with its thread, to enter downwardly through the loop into the work. Simultaneously with the downward stroke of the needle the looper retires and casts off the prior needle-loop, whereupon the stitch is immediately tightened up, so as to almost disappearin the under side of the fabric.`

A distinguishing feature of thismachine is that all the operative arts of the same are disposed above the wor -plate and in sight of the operator, so that they can be easily got at if needed.

I will now describe my invention with ref?` erence to the accompanying drawings, in which- Figure l is a frontelevation, partly in section, of the improved machine. Fig. 2 is a similar view of part of same, showing the needle-thread pulled up andtightened. Figs. 3 to 8 are` dia rammatic viewson an enlarged scale, showing the relative positions of the needle, the looper, and the spreader during the formation of a stitch. Fig. 9 is a plan of Flw. thereof on the line 1 1 `11 of ig. 9,

an enlarged` scale.

Fi 10 1s an under side view of the same, an

11 is a section a piece of the work, showing the stitches on b In my improved sewingl-rnachine I employ a` curved looper of U s ape comprising a short or operating limb a, a long limb or shank c', and a bend or throat a?. a has a pointed endor nose with an eye b and a rearwardly-extending uide-groove c for the looper-thread L, wlich is introduced through an eye orthreading-hole d at the rear end of saidgroove. The shank a ofthe looper is firmly securedto the free end of a lever e, which isfast on an axis e', above the,` u ,Y work-plate A to the left of the needle B, and

Whose function is to rock the looper in avertical plane on the right-hand side of the needle, its range and time of motion' being such r that When the needle is in its lowest position the nose of the looper is slightly to the left thereof, and when fully raised its nose is about level with the eye of the needle, and

the bend or throat a2 is below the work. The

looper thus constructed and arranged is eneach newly-formed needle-loop without disturbing the latter. i

The looper-operating mechanism consists of a crank f on the axis e and connected by a rod h to the arm 'i of the needle-lever j, whlch is drven from the main shaft K by an eccentric The spreader comprises a stem and a bent arm m, which` latter is flattened at its free end and is formed with a rong or fork m. The stem of bent arm mis Xed in the end of The limb V 1 abled to enter its nose with its thread L into 3 an inclined rocking spindle n, which is mounti ed in suitable bearings on the frame and im-` parts to said spreader a circular reciprocatin or swee ing motion ina nearly-horizonta plane, tlie motion being obtained by means of a crank n', mounted on the upper end of the spindle n and connected by a rod n to a bell-crank lever n3, which is driven from the shaft c by an eccentric n4. The spindle n is mounted, preferably, at an angleof fifteen IOO degrees from the vertical in order that space has risen up to the path of said spreader the fork m of the latter is a little below the eye and close to the back of the looper. From this position the spreader moves toward the needle and at -the. same time catches the looperthread L, which it asses below and I thread N is passed through an ordinary tension device s and guide-eyes t t t2, and is then led from the back of the needle-lever y' under thestud p and over the pulley r to the eye of the needle, the position of the said stud and pulley being such that when 'the needlelever descends the stud p impinges against vthe thread N close to the pulley 7", and thereby pulls the lower ortion of the thread tight at the moment w en the needle-loop is released from the looper, as seen in Fig. 2. The under or looper-thread L before being threaded into the looper may also pass through a thread-eyelet i).

Referrin tov Figs. -3 to 8, and more especially to Fig. 4, it will be observed that the needle-loop while encircling the loo er is not'l dragged or increased in len th, an hence it does not become frayed or amaged.

The other parts of the machine not specially described are of ordinary construction, although their form is somewhat alteredas to permit of the arrangement of all the working parts being located above the work-plate.

In my im roved machine the operation is as follows: 'iihe work having been laced in position and the machine started, tiie needle descends with its thread N and penetrates the work to the required distance below. As the needle retires its thread forms a loop below the work, and the nose of the looper, with its thread L, immediately enters the said needle-loop, as indicated in Fig. 3, the needleloop encircling it and sliding down toward its throat a2; The needle and the looper then move upward together, and by the time their upstroke is nearly Ycompleted the spreader m yhas advanced toward the looper, and its fork m catches the'looper-thread L near the eye b, asshown at Fig. 4, and pulls the portion thereof from between the said eye and the previously-formed stitch over the edge of the work and beneath the point of the needle, as at Fig. 5, thereby forming an overedge-loop of the looper-thread. The needle now descends and carries its thread N through the said loop, as shown in Fig. 6, while the spreaderwit draws. Concurrently with this movement of the needle the looper is also traveling downward and when nearing the end of its travel casts olf the needle-loop x, as is shown in Fig. 7. At this moment the stud p comes into contact with the needlethe stitch, as indicated in igs. 8 and 11. The stitch being thus produced, reference to Figs. 9, 10, and 11 of the drawings will show Athat the needle-thread N lies in one vertical plane and forms a series of loops at :152 on the under side of the work and a series of straight 'stitches y y y2 on the u per side thereof and that the looper-thread passes through the loop on the under side over the edge of the work and around the root X of the needleloop on the u per side of the work, then back again to tlie under side through the nallyT to the next loop x', thus completing a full stitch, and so on, the needle-thread loo s ed e of the work.

at I claim, and desire to secure by Letters Patent, is-'- n l. An overseam sewing-machine provided with a reciprocating needle and means for operatin it, an oscillating thread-carrying looper a apted to move in the arc of a circle whose center of motion is situate at a point above the cloth-plate, the thread carrying portion of said looper having arange of movement in the path of said arc across the edge of the work and extending from a point below the cloth-plate to a point above it and adapted to both enter and cast off the needle-thread loop below said cloth-plate, said thread-carrying portion of said looper acting to move through said needle-thread loop in entering and casting it off so as to always maintain it below said cloth-plate at the same time carrying its looper-thread loop above said clothplate, an oscillating s reader adapted to engage the looper-threa loop and to spread the same upon the work for the said needle to enter it, means for taking up said needle-thread after being cast off the looper, and means for actuating said looper and spreader.

2. .An overseam sewing machine provided with a reciprocating needle and means for operating it, an oscillating thread-carrying looper mounted on a pivot situate above the cloth-plate and on that side ofthe needle which treatment, said looper comprising a air of limbs united by a throat-piece andl avin oneiofsaid limbs adapted to carry the threa and being so curved that it always lies and operates in the arc of a circle whose center is coincident with the axis of said pivot, said looper bein adapted to both enter and cast off the nee le-thread loop below the clothplate, and a spreader en aging and spreading said looper-thread for te needle to enter it, and means for operating said looper and spreader.

thread N, as shown in Fig. 2, and tightens :ijiheneedle-loop, thus finishin and perfecting being all in alinement-i. e., parallel with t eV is remote from the edge of the work under same loop from which it passes longitudi- IOO IIO

3. An overseam sewing-machine provided with a reciprocating needle and means l'or operating it, an oscillating threadcarrying loupermounted on a pivot situate above the cloth-plate and on that side ul' the needle which is remote. l'rom the edge ul' the work under treatment7 said louper.comprising a pair of limbs u and c', throat-piece el uniting said limbs and the limbs l-ieing su curved that spreader.

4, An overseam sewing-1nachine provided with a reciprocating needle and means for operating it, an oscillating tln'ead-carrying curved louper of a U shape and comprising a short limb provided with an eye near its point, a long` limb and a throat uniting it with said short limb,` the said louper havingits center of motion above thecloth-plate; the curvatures ut said louper-limbs being substantially coincident with arcs struck from said center of motion and the said luuperlimbs reciprocating un said arcs and the said short limb thereby entering the needlethread loup below the cloth-plate and substantially normal` to the plane of the loop and at the beginning of the upstroke of said louper, and subsequently casting it otl on its downstroke below Said cloth-plate, tu maintain it below the level of said cloth-plate and to prevent lengthening said needle-thread loop, an oscillating sqreader adapted to engage the louperthread loop and spread the same upon the work for the said needle tu enter it, means for taking up said needle-thread after being cast uit the louper, and means for actuating said louper and spreader.

` 5. An uverseam sewing-machine provided with a reciprocating needle and means for operating it, an oscillating thread-carrying louper engaging the needle-thread loop and assing its thread-carrying end through said oop belowthe work and then casting uit' said loop below the work so as to maintain said loop always below the work, an oscillating spreader engaging the looper-thread loop above the needle-thread loop after the louper has passed through the latter and serving to spread such louper-thread loup above t-he work for the needle tu enter said loop, means 'for taking up said needlethread alter it is cast ull' the louper, and means' or operating said louper and spreader, whereby said needle-thread loop on the under side ul' the woi'hY is drawn into the same plane with the needlethread upon the upper side and the needlestitches are maintained in the said same plane.. y

(i. n overseam sewing-machine provided with a reciprocating needlI and means` for i operating it, a depending oscillating threadl carrying looper adapted to move in the are ol' a circle whose center ot motion is situate at a point above the cloth-plate, the thread-ear rying end of said louper having a range ol movement in the path ul" said are extending from a point below said cloth-plate tu the side ul5 the needle opposite to that on which the edge of the Work is caused to travel tu a point above the cloth-plate and adapted to both enter and cast ull' the needle-thread loup be low said cloth-plate and tu maintain said needle-thread loup below said clothplate, the point of said louper being directed upwardly un the end of its upstroke and directed substantially horizontally on the end of its down stroke, an oscillating spreader adapted tu engage the louper thread loup when passed through and raised above said needle-thread i loop and spread the luoper-`thread loop upon the work 'for the said needle to enter it, means for taking up said needle-thread after being cast oli the louper, and means for actuating said louper and spreader.

7. An ovcrseam sewing-machine provided with a reciprocating needle and means for operating it, an oscillating thread-e-arrying louper moving in the arc4 of a circle whose center of motion is situate at a point above the cloth-plate and adapted to both enter and cast off the needle-thread loop below said cloth-plate and to :maintain said needlethread loop below said cloth-plate at the same time carrying its louper-thread loop `above said cloth-plate, a spreader adapted to engage said louper-thread when raised to spread it over the work and comprising a bent arm m, a forked end m on said arm, and an inclined spindle yn to which said bent arm is secured, and means for operating saidloopcr and spreader.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

ERNEST FREDERICK DURAND.

Vitnesses:

GEORGE E. MINTERN, H. D. JAMESON.