US1775913A - Needle-thread-controlling device for sewing machines - Google Patents

Description

W. N. PARKES Sept. 16, 1930.

NEEDLE THREAD coNTRoLLING DEVICE Fox SEWING uAcHINEs Filed Jan. 15, 1929 Patented Sept. 16, 1930 NETE TATES PATENT GFFICE WILLIAM NELSON PAEKES, OF BROOKLYN, NEV YORK, ASSIGNOR T THE SINGER MANUFACTURING COMPANY, GF ELZABE'll-I,

JERSEY NEW' JERSEY, A CORORATION OF NEW' NEEDLE-THREAD-GONTROLLEG- DEVECE .FOR SEVNG IVIACHINES Application filed January 15, 1923.

U facilitating the casting of the needle-thread loop about the lower-thread mass. lt is the object of this invention to provide needlethread loop-controlling means insuring the rapid spreading of the loops in the preliminary stages of casting said loops about the lower-thread mass.

To the attainment of the object of the invention, the throat-plate of the machine is provided on its underside with a depending lug positioned to overlie the beak of the loop-taker as said beak enters the needlethread loop. This lug presents an abutment face for the needle-thread loop seized by the loop-taker whereby, in the continued rotation of the loop-taker, said thread-loop is forced rapidly along the inclined side or sides of the beak toward the throat thereof.

To accommodate the upward movement of the limb of the seized thread-loop which is cast across the upper rim of the thread-mass carrier, the abutment face of the lug is inclined downwardly toward the rear edge of the lower corner thereof nearest to the looptaker axis and the lower edge of the lug is inclined upwardly towards that corner. The throat-plate lug is furthermore provided with a vertically directed groove adjacent the throat-plate needle-aperture upon the side of the needle opposite to t-he looptaker side thereof for the purpose of receiving a limb of the needle-thread loop during the formation thereof, thereby directionally controlling the position of the other limb for entrance by the loop-taker beak. To this end, the lug has a portion extending substantially at a right angle to the abutment face of the lug, in which lug portion the thread-guiding groove referred to is provided.

In the accompanying drawings, Fig. 1 is Serial No. 332,813.

a front elevation, partly in section, of the loop-taker end of a sewing machine containing the present improvement. Fig. 2 is a top plan view of the cloth-plate of the machine, with the usual slide-plate omitted to expose the loop-taker mechanism. Fig. 3 is a bottom plan view of the throat-plate of the sewing machine. Fig. fl is a perspective view of the portion of the throat-plate having the needle-thread loop controlling lug. Certain features of this loop-taker mechanism arc shown more in detail in an application filed Jan. 15, 1929, with Serial No. 332,610.

Referring to the drawings, the present iinprovement is shown as embodied in a sewing machine having a cloth-plate 1, upon which is suitably secured a throat-plate 2 and the slide-plates 3 and l, disposed at opposite sides of the throat-plate. The throat-plate 2 is provided with the usual aperture 5 for a vertically reciprocatory needle 6, and with parallel slots, as 7, in which operates a feeddogl .8 which may be actuated in any welll-:nown manner to advance the work. Opposed to the feed-dog is the usual presserfoot 9.

Suitably secured to the underside of the cloth-plate is. a loop-taker bracket in which i fixed a bushing 11 constituting the journal for the forward end of a horizontally disposed actuating shaft 12, which rotates once only for each complete needle-reciprocation. Secured upon the end of the shaft 12 is a bevel-gear 18 in mesh with a similar gear 14 upon the vertically disposed loop-taker shaft j-ournaled in the bracket 10. The gears 13 and 14; are proportioned to impart two rotations to the shaft 15 for each rotation of the actuating shaft 12.

Detachably secured to the upper end of the shaft 15 is. av loop-taker 16 provided with a loop-seizing beak 17 of which one side 18 is inclined downwardly from the point of the beak toward the throat 19 thereof, i. e., inclined downwardly toward the bottom of the loop-taker. The loop-taker 16is also provided with a loop-discharging spur 2O directed oppostely to the beak 17 and upon which .spur the needle-thread loop passeswhen it is 'drawn off said beak 17.

Journaled within the loop-taker 16 is a bobbin-carrier 21 within which is disposed a thread-carryingb-obbin 22.- rlhe bobbin-czarrier is'provided with flangesk 23 and 24, extending above the orbit ofthe lloop-taker beak. The flange 23 Visdisposed at the loop i cast-'offiside of the loop-taker and-terminates at its opposite ends-in stop-'shoulders 25 and 26, the stop-shoulder 25 beingpositioned to engage a stop-lug 27 ,depending from the throat-plate, whereby Vthe bobbin-carrier is restrained against rotation with the looptaker. The stop-shoulder 26 isadapted to engage a fixed' stop-inger28 to limit the rotation of thebobbin-carrier in a directi-on opposite to the direction of rotation of the looptaker. k,'Iheothery flange 24' of the bobbincarrier i's'disposed at the loop cast-on side of the,loop-takerand terminates in a stop-shoulder '29 which is intermittently engaged by an opener-finger 30 suitably actuated to'oscillate fthe bobbin-carrier in a direction to vprovide a thread-loop passage past the stop-lug 27. f By referring to Fig. 2 ofthe drawings, it will'be observed that the loop-taker axis is disposed in 'a vertical plane extending through the throatplate needle-aperture in a direction substantially transverse to the direction of feed.' f L Depending from the under side of `the i throat-plate 2 is a needle-thread 'loop control-V f'linglug 31 in position to overlie the looptaker beak as it is entering the needle-thread loop; This lug 31has a'front loop-abutment face 32 extending` generally `,transversely of the length of the feed-slots 7 and disposed directly rearward of the 'needle-aperture 5,

said abutment face being inclined downward- Yly in a direction toward the lower rear edge of the lug and also inclined-laterally toward the rear. corner of the edge nearest the looptaker axis. Furthermore, the lower edge of' the lug is inclined upwardly from the needle-aperture toward the-lug-edge nearest to ment of the :loop-limb cast across the'upperk As the loop-taker beak 17 enters the loop of thread presented by the needle, it carries the loop against the abutment-face 32 of the lug.

The loop being thus held against freely following the point of the beak 17, said loopy is forced toward the throat 19 of thebeak vand is therefore-rapidly spread to facilitate the casting ofthe loop about the bobbin-carrier.H The describedinclines ofthe abutment-face are 'designed to accommodate theseparation ofthe loop-lnnbs during the loop-spreading operation and partlcularly'the upward moveside of the bobbin. y n

Upon the side of the needle-aperture 5 directly opposite to the loop-taker side thereof,

the lug 81 is-provided with alug-extension 33 disposed substantially-at right angles tothe abutment-face'52.k 'Formed in this lug-extension on the side thereof next to the throatplate needle-aperture is a vertically disposedV groove 34 adapted'to receive a limbv of the needle-thread loop and thereby. directionally present the other limb for entrance byV the loop-taker beak.

Having thus set inventionv what I claim herein is: d i 1. ln a sewingmachine hav'ng aV throatplate provided with' a needle-aperture, a thread-carrying needle reciprocating Vthrough said aperture, a vertical-axis rotary loopforth the nature of the L taker below the throat-plate having a loopi seizing beak of which one sideis inclined downwardly vfrom its point towardy the throat thereof, yaibobbin-carrier journaled in'said loop-taker, and a thread-loop controlling 'lug depending from the t-hroat-plate in position to overlie the loop-taker'beak vas it enters the needle-thread loop, a face of said lug constituting an abutment which in the continued rotation of the loop-taker forcesa vlimb of 'the needle-threadloop toward the throat of the beak-to thereby assist inV rapidly spreading said needle-thread loop, the abutment face of said lug being inclined downwardlyV towardthe opposite face of the lug-andthe lower edge'of said facebeing inclined upward-v ly toward the bobbin-carrier to provide for the upward movement of the limb of ythe .neeelle-thread loop cast across the upperside of' the bobbin-carrier. c

2.. In a sewing vmachine having. a throatplate provided with a Vneedle-aperture, a thread-carrying needle reciprocating through said aperture, a vertical-axis rotary loop-taker below the throat-plate, provided with a loop-seizing beak, a bobbin-carrier journaled f f in said loop-taker extending above the 'orbitof the loop-taker beak, and athread-loop con-V trolling lug depending from the throat-plateV in positionto overlie the ,loop-'taker beak as it enters theneedle-thread loop, said lug having a needle-'thread loop abutment facelextendintg` generally transversely ofthe throatplate irectly rearward of'said needle-apertureandsaid abutment face being inclined i in' substantially transverse directions toward the lower rear corner of the lug nearest the loop-taker .axis to ,providev for ythey-upward movement of the 'limb of ftheneedle-thread loop cast across the upper side ofthebobbinto overlie the loop-taker beakas it enters'the i needle-'thread loop, lafaceof said lugcon-V WILLIAM NELSON PARKES.

Images