USRE188E - Improvement in sewing-machines - Google Patents

Description

3 Sheets- Sheet 2.

s. o. BLODGBTT & J. A. LERoW. SEWING MACHINE.

No.v 188. Reissued Jan. 14, 11851.

3 Sheets-Sheet 3. S. C. BLODGETT 8u J. A. LEROW.

SEWING MACHINE.

Reissued Jan. 14

feeding-bar,

UNITED STATES PATENT OFFICE.

SHERBU'RNE o'. BLODGETT, or GEORGETOWN, AND JOHNA. LEnow, 0F

BOSTON, MASSACHUSETTS.

IMPROVEMENT IN sEw|NGMAGH|NEs.-

i Spccilicntou' forming lpart of Letters Patent No. y6,766, dated Octobrr 2, 1849; IleissucNo. ISS, dated January 14, 1851.

To all uhom'it may concern Bc it known that we, SHERBURNE C.- BLODG ETT, of Georgetown, in the county of and Stat-cfof Massachusetts, and JOHN n. LEnow, of Boston, in the .countyof Suffolk r ud State aforesaid, ha\'e invented certain new and useful Improvements in Sewing-Machines;I and we do hereby beclare that thefollowing descriptiolntaken in connection with'the accompanyi-ug drawings, hereinafter referred to, forms a full and exact specification of the same,

wherein wehavc set forth the lnature and prineiples of our said improvements, by .which our invention maybe distinguished from others of a similar class, 'together with such'partsaswe claim and desire to have secured ters Patent.'-

The. figures -o'f the accompanying plates of drawings-represent our newl rotary sewing- ,maohine, as We term it.

Figure 1, Plate 1, is a side elevation of the Fig. 2, Plate- 1,-is a vertical section taken in the plane of the lineA B, Fig. 1, Platevl, and Fig. 3, Plate 2.` Fig. 3, Plate 2, is a horizontal Section taken in thefplane of theline C D, Figs. 1 and 2, Plate 1. Fig. 4, Plate 2., is a detail sectional view ken on the line E F, 'Fig'. 3, Plate 2; Vand Figs..5 and 6, Plate 2, are detail views, -which willl be re ferr-ed to in the sequel.

to us by Let! Qur machine is distinguishedvfroniall otherl 4 sewing-machines now known to us in several points very essential to the accomplishment of any valuable results from the machine and In the first place, it diers. from. all other machives in being a rotary sewing-machine, the having hooks on which the cloth is confined and carried round,. b eing circular, so that any length of cloth to be seamed may be consequently pressed onto and passed along on the same. In the secOndpla'ee, the fillingthread for making the stitch hold is carried round 'in a rotary .shuttle instead of a vibrat-4 ing one, which is a great desideratu-m, as the machine for driving the former may be. made much simpler and more substantial, while it can also be driven with much greater speed than the vibrating shuttle without any danger. The other points of improvement will be indiny real practical advantages over hand-work.

cated and more clearly comprehended in the description of the machine as we proceed with it.

The operative parts of the machine are supported on a circular metallic plate, a a, on the -top of a pillar, b b, which. is fitted in the ceu ter ofthe circular standard-plate c c.-

d d is the circular supporting-bar for hold.- ing the two pieces or edges of the cloth to be seamed or united by sewing.V It: is arranged eccentrically in reference to the circular plate a a, being supported on a horizontal projection, e e, from, said plate' on one si'de and on an arm, j' f, fastened to said plate on the other or op .posite side, as shown in Fig. 3, Plate 2, said arm having a friction-roller, g,bearing against the inner side of said bar, to guide itsl rotary motion. On the exterior face of this bar are tted, at proper intervals apart, the curved or hooked supporting-pins h h h-h, ou which the two edges of the cloth to be pinned are to be pressed, and on and all around the top edge of said bar are cut suitable rack-teeth, as shown in the several figures. A pawl, 'i z', Fig. 2, Plate l, engages at one end with the rack-teeth on said bar above referred to,being connected near its center to the vertical lever k k, which lever is secured by a fulcrum-pin, l, to the interior-of the supporting framework .m m m in,

Figs. land 2,Plate 1, and Fig. '3, Plate 2, of l thedrivingshaft n In, said frame-work resting on the circular plate a a, before referred to. The pawl is kept in connection with the rackteeth'by means of the spring o,y connectedto the foot of the lever k k, and said lever has an intermittent vibrating motion imparted to it by means of a cam, p, formed on the drum q q on the driving-shaft un, the upper end of said lever bearing against said cam, and a spring, r fr, pressing against the foot of said lever, servingto keep the upper end of the lever against the cani and drum.

The needle-thread, as we term it, is represented by' blue lines Iin the several principal figures, andv is delivered from .the spool s, which turns loosely on the spindle t t, connected to the vibrating needle-holder u u u, as shown in Figs. 1 and 2, Plate 1. Y This needleholder is for Fig. 2, Plate 1, vso as to embrace a iournal or ed at its upper end, shownin 'in the drum q and said holder is vibrated by means of a cam-A groove, \V W', properly eut for the purpose q on the diivingsliaft, into which groove a friction-roller, T, connected to the inside ofthe needle-holder is fitted, as

shown in Fig. 2, Plate 1, and by. dotted lines in Fig. 1, Plate 1. The needle'holder is bent into the shape shown in Fig.i1, Plate 1, and has on its back a long spring, a' x, confined to the same near its center, said springhaving a guiding-pin, y, at its upper end, and a guiding-hole, e, at its lower end, over and through. which, respectively, the thread passes to the under side of the needle a 'a'. Said needle is confined in the lower end ofthe holder by the confiningscrew b', and has a hole or eye a lit tie in rear of its point, as shown in Fig. 1,v

APlate 1, and Fig. 3, Plate 2, which should be small enough to keep the ythread from falling back of itsA own `weight. The needle-thread passes up through the eye of the needle, and is carried by the same through the cloth, and a proper opening or. space cut in the plate a n, across the shuttle race or groovein said plate, (hereinafter referred to, in which the shuttle moves.) Then, when the needle begins to be retracted, a loop of the needlethread is thrown up, through which the shuttle, with the filling-thread, passes, as will be hereinafter explained.

Itis vitally essential to the proper opera tion of the machine that when the needle goes forward the thread shall be free to be drawn through the eye of the needle, in order that the loop may be sufficiently enlarged to permit the shuttle to pass through the same, and as essential when the needle is retracted by the back vibration of the holder that the thread shall be rigidly held against theholder, in order that the stitch may be effeetually tightened. This is provided for by the use of Va wide spring, c c', attached to'the upper part of the supporting frame-work "m m, &c., and so arrangedin relation to the vibrating needle-holder u u u that the spring :v on the back of' said holder, under which the thread passes', as before explained, shall abut against the lower end ot'. the wide spring c c and confine the thread,as described. Another method of accomplishing the same result is represented in `Fig. 6, Plate 2, the guiding-pin for the thread being near the bottom of the holder, as shown at d', and the confining spring being a short one, and arranged on the side of the holdei` opposite said pin, as shown at g', while the tightenings'pring is a bent lever-spring, i' f 1, fitting at the lower end in a proper slot formed inthe heel of the holder, where it has a fnlcru'nnits upper end being so arranged as abut against some stationary 'part of the frame-work at the propery time to hold the thread, as before explained, said thread pass: j'ng across the holder from the guiding-piu d', under said spring, to the guiding-hole g' under the confining-spring asshowr4 in said Fig. G,

, shuttle,

The bent spring 7L h', Fig. 1, Plate 1', supports the small four-sided framej t" i i', the

exterior of the inner side of which frame bears against the cloth on the supportingbar d d, just above the hooks on the same, (the needle entering just below said hooks,) and keeps the cloth in position when the needle is withdrawn. This small frame ifiv, f/ 'i' also sustains the converging nipper-springs L 7.", between which the needle and its thread pass on their passage to the cloth, andwhen Athe needle is withdrawn these springs serve to keep the thread up sufficiently high to prevent the point of the needle, on-its return, from' splitting-f or becoming entangled with thesame'.

l l', Figs. 3, 4, and 5, Plate 2, is'the shuttle for carrying the filling-thread, which thread is represented by green lines in the several figures. It is curved at'its front part, as shown in the aforesaid figures, so as to be revolved in the shuttle-race 'm' m m m', formed in the circular, plate aa, said shuttle-race being made sufficiently wide to permit the rear 'end of the shuttle to be made straight for the insertion of the spool n ln. on which the filling-thread is wound. The front of the-shuttle is beveled or tapered down to a point, which travels in a narrow circular guidinglgroove, o o o', formed near the exterior of the shuttle-race and below the bottom of the same, so that the shuttle shally invariably pass'through the loop of the needle thread, formed` as before described. The shuttle l l is connected to and driven by the vertical rotating shaft pp, Fig.

2, Plate 1, and Figs. 3 and 4, Plate 2, by I means of the two spring-arms q q q' q', set at an acute angle, as shown in said Fig. 3, but which may be made curved in the are of a circle or circles, said arms having at their outer ends suitable pins or studs, r i", which engage with corresponding holes formed in i the top of;4 the straight part of the shuttle; or,

instead of said pins, the arms may be arranged With a slight projection, fitting said holes in the shuttle. As the shuttle passes through the loop of the needle-thread, it isv necessary that these spring-arms should be alternately disconnected from the shuttle, and this is effected-by means of `a cam-ledge, s s', formed in the inside of the frame-work m m m, directly over that part of the shuttlerace m m', Ste., where the loop is formed, and Aso curved, as shown in Fig. 2', Plate 1, as to raise said arms alternately, so that one or the other of said arms will be always driving the shuttle, in a manner which will be readily understood by the inspection of said Fig. `2. The 'vertical shaft p p turns inthe vertical tubular bearing t t', Fig 2, Plate 1, secured tothe framework m m m, Src., and is connected by -a bevel-gear wheel, a', on its top to a similar wheel, fu', on the driving-shaft u n, so that a rapid rotary motion may be imparted to said as hereinbefore suggested.. A pad or thick washer, x', made of any suitable substance, should be placed between the under side of the spring-arms d d on the ybottfnn of' the shaft p p' and the circular face of the plate a a on 'the innerside of the shuttle-race, in order to keep the filling-thread straight during the rotating of the shuttle. Otherwise the connecting-pins on said arms would get entangled with said thread.

"It should be here observed that is better to have the shuttle revolve in the opposite direction to that indicated, as it makes theV stitch better by avoiding the putting of any vfurther twist in the filling-thread, which is liable to make a kink in the stitch. i

The driving-shaft n n has a fly-wheel, y', on one end, and may be driven by hand applied to the crank s', or bra band from an v driving machinery Having thus, fully described our improved, sewing-machine, we shall state our claims as follows:

Vhat we claim as our invention, and desire to haveseeured to ns by Letters Patent in the above-described rotary sewing-machine, is-

l.. Arrangingthe shuttle which carries the filling-thread so that it shall. revolve horizontally in a circular shuttle-race, said shuttle being constructed with a curved front and point-ed nose, which shall travel in a circular guiding-groove sunk below the bottom of said -race, so that the shuttle shall invariably pass 2. The pad or Washer under the spring-arms which carry the shuttle, ior keeping the. filling-thread straight, as hereinbefore explained.

5i. The combination of the wide spring c c and the bent lever-spring f' j", operating as hereinabove described, or any contrivanee substantially equivalent thereto, for relaxing the needlelthread when the loop isto be formed, A

SHERBURNE C. BLODGETT. JOHN A. LEROW.

'Witnesses to the signature ol' Sherlnn-nel. Blodgctt:

.Tosi'An OAKES, WM. R. DIKEMAN.

W i tn esses to the signature o l' .Toh n A Lerowg;

T. C. DoNN, A. B. STOUGHTON.

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