US1041586A - Sewing-machine. - Google Patents

Description

S. BURTON, DEOD. c. P. BOBTON, ADMINISTRATRIX.

SEWING MACHINE.

APPLICATION FILED JUNE 18, 1907. RENEWED AUG.1, 1912.

1,041,586. b Patented Oct. 15, 1912.

. r. as STATES wsrsr onnlsrms P. son'ron, or wsnwIcm-nnonn Ismrm, anmmsrnarsrx or successor: non-son, :oncnasnn, AssmNon so wrmcoz: a arses snwme MACHINE company, on NEW roan, 1s. m, A oonsonnrron or new 201m.

SEWINGJJACHENE.

menses.

Specification of Letters Patent.

Patented Get. 15,1012.

original application flied December 13, 1906, Serial No. 847,659. Divided and this application filed June 18, 1907, Serial No. 379,655; Renewed August 1, 1912. Serial No. 712,768.

To all whom it may concern:

Be it known that STOCKTON Bon'roN, deceased, late a citizen of the United States, and resident of the town of Warwick, county of Kent State of Rhode Island, did invent new and useful Improvements in Sewing- Machines, fully set forth in the following spccificat1on.

The'present invention relates to a sewingmachine especiail designed to produce, by

one operation an at high spec (meaning that each needle shall be capable of making approximately three thousand or more stitches per minute), a complete seam of special form for joining two abutting edges of cut-knit goods.v

This i a divisionof his application for United States Letters-Patent iilcd Dec. 13, mos, Sr. No. 347,649.

The present invention is particularly directed to improvements in thread-cutters, constituting permanent parts of the mechanism and operable to sever all of thethrcads connected'to the work when the latter is removed from the machine.

In the drawingsFi re 1 is a perspective view of a part'o a machine such as illustrated in his application for patent above mentioned,illustratin the operation of the upper thread-cutter w ran it is necessary to remove the' work where the seam cannot be run oi! the outer ed 0 of work; Fig. 2 is a perspective view o the end of the work-arm of the machine illustratin the operation of the lower thread-cutter w ien it is necessary to remove the work where the seam cannotbe run oil the outer edge of work; Fi 3 is a perspective view of the machine, at t e and of and above the work-arm, illustrating the mechanism operating at this point; Fi 4 is a lan view (with parts in section) 0 the mec ianism shown in Fig. 3; Fig. 5 is, a vertical sectional view throu h the end of the hollow work-arm showin t 1e mechanism operatin within the same. ig. 6 is a detail view 5 owing part of an arm $100") of the frame of the machine with the used member of the upper thread-cutter sccured thereto,

The sewing-machine to which the threadcutters of his present invention are applied, is adapted tojform', by a single operation" the scam constituting the subject-matter of 1118 United States Letters-Patent No. 883,614, dated March 31st, 1908; said scam is also illustrated and described in his above-montioned patent application Sr. No. 347,649, filed December 13, 1906.

40 is the end of a hollow work-arm of the machine, said arm terminating below overhanging parts of the stitch-forming and other mccianism, as shown in Fig. 3.

100", Figs. 3 and 4, is a ri id arm extendmg from the frame-work Tnot shown) of the machine.

85 is a vertically movable hollow presscrfoot bar extending downward through hub 216 (Fig. 3) of prcsscr-foot 26 and into a bearing in arm 100". Means not shown, rigidly secure the presscr-foot to bar 85. The particular construction of the presserfoot forms no part of the present invention, and hence does not require explanation herein,

100" is a plate secured to arm 100" by two screws 100. A screw 304 on the presser-foot works in a slot 305 in plate 100 and assists in guiding the resser-foot in its vertical movements. At its forward end the prcsscrfoot is notched or bifurcated forming two toes 26 and 26 se arated bv a s ace in which the upturned edges of worc to be trimmed advance to the trimmer blades 00 and 87, 00 being a fixed blade secured in too 26 of the prcsscr-foot, and 87 being a movable blade.

111 is a work-guide and trimmings deflector, secured to toe 26 by a screw 114 and adjusted to different positions by a lover 115.

84 is a sleeve or hollow shaft surrounding and rotatable about the hollow presscr-foot bar 85-and terminatin above the hub 216 of the resser-foot. A cut arm 84 depends from the lower end of trimmer-sleeve 84 and has the movable trimmer blade 87 secured thereto. Through driving connections (not shown) to the upper end of trimmersleeve 84, the latter is oscillated about bar 85, swinging the arm 84 and reciprocating blade 87.

Four needles, 1, 2, 3", and 4", are secured together to the lower end of tho needle-bar, only a part of which is shown in Fig. 3.

80 is a cross-thread carrier secured to the lower end of a shaft 78 which depends from suitable bearings (not shown) in the frameter is cast integral with plate 100.

nections (also {not shown) oscillate-said shaft and its.thread'carrier. Y

101 is 'a cross-thread-hook secured to the lower end of a short vertical shaft 99, journaled in a tubular bearing 100, which lat- 98 (Fig. 4) is a short crank-arm secured by a set-screw to the upper end of shaft 99, and connected by a link 96 toga crank arm84" on trimmer-sleeve 84. Through these connections oscillation of sleeve 84 oscillates,

shaft 99 and the cross-thread hook 101.

28, Figs. 1 and 5, is a throat-plate secured in an opcnin in the upper side of the end of the wow-arm, by a screw 28* (Fig. 5).

20 is the feed-surface, comprising rows of teeth adapted to work 11 ward through slots in the throat-plate, and having a foot 165 through which a screw 165 passes to secure thefeed-surface to the end of a feedlever 159, which lever is actuated by driving connections. (not shown) to im art the desired movement to the feed-sur ace.

14 (Fig. 5) is a loop spreader adapted to be oscillated in a horizontal plane by its connection to theend of feed-lever 159.

6", Fi 5, is one of a gang of four loopers arrange side by side on a looper-carrier 183 at the end of a looper-lever 177. Suitable driving connections (not shown) to the' other end'of the looper-lever, impart to the loopers suitable elliptical movement in a horizontal plane.

In the operation of the machine, the elements above described cotiperate to trim the two upturned edges of a pieceof fabric, such as 30, Fig. 3, and to then connect said trimmed edges by threads in such manner as to form the seam heretofore referred to. The upper or needle side of such seam is shown in Figs. 2 and 3, the cross-thread 5 being looped backward and forward beneath the stitches in the needle-threads.

The above descri tion of the stitch-forming elements will acilitate an understanding of the thread-cutters which will now be described.

The provision of special means for cutting or clipping the threads is particularly desirable to facilitate removal of the work when it is not desirable to continue the scam to the outer edgeof the work. To leave sufiicient lengths of thread-ends through the four loopers, such as 6, the eye 5" of thread-carrier 80 and the eyes of needles 1", 2, 3, 4, it is desirable that, the thread-cutters shall operate to pull off sufiicient thread .and clip the 'threadsat point-s toleave the desired length of thread-ends. In the. drawings I have shown anjupper thread cuttcr230 and a lower thread-cut or. The. latter consists-of a bar 235 bent at one end to formia finger grip 288 (Fig. 2) and 1,os1,ess v V at the other end having a right-an le blade 241 having a shearin edge 241 an a sleeve 236 through which latter a. horizontal rod 237 passes (Figs. 1 and 2). This threadcutter bar 235 is longitudinally movable in a groove or depression in the top of cover 40 and is guided by said groove ,and by its engagement with rod 237 which constitutes a earing'on which this thread-cutter is mounted to turn and also move longitudinally. When not in use the blade takes the position shown in Fig. 5, and lies in a transverse recess or depression 241 in cover 10, being held in this position by a spring 239, Fig. 2, which bears against bar 235 along its inner edge, and thus tends to constantly hold the blade 241 in contact with the surface of the work-arm beneath said blade.

To sever the threads and remove work from beneath the resser-foot, the machine is stopped with tile needles elevated. In the normal relation of the parts the teeth of the feed surface will under these conditions project above the throat-plate. Through connections which need not be here explained, the lifting of the resser-foot (by means not shown) will simul the feed-surface below the surface of the throat-plate. Thereupon the operator by means of grip 238 ushes the thread-cutter forward, causin, b ade 241 to advance up an inclined sur'ace 242 (Figs. 2 and 5) at the front end of recess 241" and along the surface of the throatlate beneath the work, gathering in front 0 it the threads extendmg downward from the work and pulling oil lengths of the threads suflicient to form loops around the edge of blade 241. In Fi 2, I have shown the blade 241 as thus pulling off loops in the four looper threads 6, 7, 8 and 9 only; but as the blade 241 will in its advance also encounter the four needle threads, each extending downward from the work in a loop around its corrcs onding loopcr and upward through the wor: to the eye of the needle, it follows that the blade will also pull of? lengths of the needlethreads sufficient to form loops (illustration of which in the drawings would involve much confusion) around the edge thereof. When the blade 241 passes the end of the throat-plate, the pressure of the spring 239 (Fig. 2) causes it'to dro into a transverse recess 248 (Figs. 2 and 5) in which position its further movement causes its cutting edge 241 to act against the cutting edge of a blade 244 fixed by screws 2A5, thereby severing all of the threads which were gathered up b the blade 241, or in other words, all threa extendin from the underside of the work. The on s of looper-threads 6, 7

8 and 9 thusscvcred would extend upwar from the loopers through the throat-plate andalong the utter beneath the presser-foot.

The time severed ends of the needle-threads 130? d 2, 3 and4 would extend from the needlein sleeve orhub232 which latter is a part of its cutting edges this thread-cutter is screws, as'shown in Fig. 6, passing through eyesdownward through the work and along the throat-plate beneath the resser-foot. Hence if this thread-cutter be alone relied upon to cut the needle-threads, withdrawal of the work will cause the ends of said threads to be drawn through the work.

For thepurpose of cutting the needlethreads 1, 2, 3 and 4, and the cross-thread 5, above the work, when for example it is desiredito terminate the seam and remove the work before the edge of the fabric or work is'reached, a thread-cutter 230 is provided. It consists of a blade. having cutting edges 230 230? (Fig. 42) secured to the lower end of a vertical stud 231. free to'turn of plate 100 (Fig. '3). Atthe outer ends slightly hooked, so that when the needles, resser-foot and other parts are raised, and the cutter swung around in front of the needle and cross-threads, as shown in Fig. 1, said threads are gathered in by the acting cuttingfledge and pulled back under the end of chaining-foot 25 and over the work, thereby forming loops of these threads around the cutting edge until the threads contact with the edge of blade 233 (Fig. 1), when" the threads are sheared or cut off, leaving ends through the needles and cross-thread looperv 80 of suflicient length to start the next seam. Blade 233 is fixed to the underside of the frame-arm 100 (Fig- 3) by the openings 233, (Fig. 1). In Fig b, the plate 100, attached to arm 100?, .tsron itted,

What I claim is: a f

1. In a-sewing' machine,the' combination j with... stitch Q forming mechanism including one or more needles, of a work 'supportlngarm having a free end at which said stitchforming mechanism operates, a presser-foot and a throat plate, and a threadcutter mounted on a bearing on the work-arm and 45 normally in a position clear of the space between the resser-foot and the throatplate but movable on said bearing to traverse the space between the presser-foot and needle or needles (when elevated) and the throat-plate to sever thread extending from the-work in the'path of said thread-cutter. 2. In a sewing machine, the combination with stitchforming mechanism includin one or more needles, of a work-arm forme with a recessin its outer surface and a thread-cutter mounted on. said work-arm and normally positioned in said recess but movable upward out of the recess and along the arm to sever thread connected to the work. 1 a

3. In a sewing machine, the combination w-ith stitQ-iorming mechanism including one or more needles, offibrbanniomued with a recess in its upper surface, and a thread cutter mounted 'on said workarm and including a blade extending transversely across the upper surface of the workarm and normally positioned in said recess but movable upward out of the recess and Witnesses:

HERBERT E. MATHEWSON, JAMES C. COLLIN, Jr.

Cojiestf fiatent' may be obtained for five cents each, by addressing the f Commissioner of Patents, Washington, I 6- v

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