US580015A - Sewing-machine - Google Patents

Description

(No Model.) 2 Sheets-Sheet 2` E. M. STAPLES.

SEWING MACHINE.

10.580,0155J Patented Apr.6,189'/` Y Imm" M w il l y l? d N HNEK UNrTED STATES PATENT GFFICE.

ELIAI. M. STAPLES, OF ELIZABETH, NEW JERSEY, ASSIGNOR TO THE SINGER MANUFACTURING COMPANY, OF NEIV JERSEY.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 580,015, dated April 6, 1897. Application filed September 18, 1894. Serial No. 523.383. (No model.)

To @ZZ whom t may con/cern:

Be it known that I, ELIAL M. STAPLES, a citizen of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to that class of sewing-machines which form the double-chain or Grover it Baker stitch, and has for its object to provide a machine of the class referred to which will be simple in construction, so that it will be inexpensive to make, and in which the movements are strong and positive, so that the machine will be capable of running at high speed and with but little noise.

In the drawings, Figure l is a side view, partly in section, of my improved machine.

Fig. 2 is a sectional view at the forward end of the work-supporting arm on a larger scale than in Fig. 1. Fig. 3 is a front end view of the machine with the face-plate removed. Fig. 4 is a detail view of the lower-threadtake-up device. Figs. 5 and 6 are detail views to show the trimming-blades. Figs. 7 and S are detail views of the feeding mechanism.

The framework of the machine consists of the base A, the standard A', the overhanging arm a, having the head a at its forward end, and the lower or work-s upporting arm a2. For some kinds of work a flat work-plate is desirable, and this arm machine maybe converted into a bed-plate machine by means of the flat work-plate a3, having a yoke a4, by which and the set-screw d5 said work-plate may be removably attached to the arm a2.

B is the drivin g-shaft, j ournaled in the lower partof the framework and provided near its rear end with an eccentric connected by a pitman c to the rear end or arm of the needleoperating lever C, to the forward end of which the needle-bar c is connected to be reciprocated vertically in the head a', said needlebar carrying the usual eye-pointed needle c2.

D is a small rock-shaft journaled in a bearing in the forward end of the arm a2 and having an upwardly-extending arm d, which supports a sleeve e, having a rounded or ball-like portion e to prevent binding at its point of connection to the arm d. The needle-operating lever C has a depending arm c3, to the lower end of which is jointed the rear end of a rod E, carrying at its forward end the threadcarrying looper e2, said rod E passing through the sleeve e. The rock-shaft D is provided at its forward end with an arm d', slotted to embrace an eccentric Z9 on the forward end of the drivin g-shaft B, so that rotation of said driving-shaft causes a rocking movement to be imparted to the shaft D, and thus the looper-carrying rod E, passing through the sleeve e, carried by the arm d of said rockshaft, will be moved to and fro laterally by said arm as said rod is reciprocated longitudinally by reason of its connection with the arm c3 of the needle-lever, thus causing the looper e2 to be moved forward on one side of the needle and backward on the other side thereof, as is usual in double-chain-stitch machines.

To the arm d of the rock-shaft D is attached a plate cl2, having a finger cl3, which, as the needle is rising, is moved against or closely adjacent fo the front side of said needle to throw out or open the loop of needlethread on the rear or opposite side of the needle, so that the loop will be entered with certainty by the looper'ei?, which moves forward as the needle rises on the side of said needle opposite to that on which said loop-forming finger d3 is placed.

The shaft B is provided with an eccentric b2, embraced by a yoke F, having a slotted arm f, jointed at its lower end to an arm g, fast on the rear end of a tubular rock-shaft G,

surrounding said shaft B, and provided at its forward end with a second rigid arm g. The slot of the arm f is entered by a pin or rollerstud to be carried by a feed-regulating lever H, pivoted at h to a part of the machineframe and provided at its outer end with a milled set-nut h2 to hold said regulating-lever in any desired position of adjustment.

The arm g is embraced by lugs 'i on a horizontally-movable block or slide I, said lugs entering a horizontal guidegroove @6in the front end of the arm a2. The block or slide I is recessed for the reception of a block K, vertically movable in said block I and carryioo device L through thread-take-up eyes m,

formed in plates m, carried by the needlebar c and working on opposite sides of a bar n, provided with an opening in which is placed a check-tension spring n', pressing lightly against the inner wall of the opening in the bar fn, so that the needle-thread passing through said opening from one to the ,other of the eyes in the plates m will be momentarily detained by said spring when the needle is descending, and the slack will thus be controlled so that the thread will not get in the way of the point of the needle. This needle-thread-controlling mechanism is substantially the same as that which has long been in use in the Willcox & Gibbs machine, and its operation is therefore familiar to those skilled in the art to which my invention relates.

Coperating with the above-described controlling device for the needle-thread is a novel take-up device for the looper-thread which I will now describe.

Attached to the lower end of the arm c3 of the needle-bar-operating lever C is a take-up device consisting, preferably, of a wire loop fr, bent at right angles to form a shoulder o, 1

and supported by a housing-plate P is a second wire loop p, said plate P having an opening or slot 1o', through which the said loop r extends and in which it reciprocates when the l machine is in operation.

S is a bent plate attached to the base A outside of the plate P and having a horizontal portion extending inward through the slot or opening 1J of the said plate P, said horizontal portion of said plate S having an inclined slot s, which is so arranged yrelative to the path of movement of the shoulder r of the loop r that as said loop is reciprocated with the arm c3 of the needle-bar-.operating lever and with the looper-operating rod E, connected with said arm, said shoulder will cross from the inner -to the outer side -of said in-A clin ed slot.

The looper-thread runs from the tension device L' to the forward side of the upper limb or bar of the loop p, thence through said loop around rearward of the loop r land down through the inclined slot sof the plate S, andv thence forward below the said loop r and against the front edge s of the plate S and through the hollow work-supporting arm a2 to 'the looper e2, working in said arm. Thus as the said looper is making its backward movement after having passed its thread through a loop of needle-thread the slack of the looper-thread is taken up by the Wire loop-take-up device fr during a portion of the y backward travel of the said looper, but when` in the backward movement of the said take-A up device the shoulder r thereof crosses over far enough to the front side of the inclined slot s of the plate S to permit the thread to escape past said shoulder into said slot the thread will be momentarily slackened, so that the stitch will not be drawn too tight, and thus a slack or elastic stitch seam suitable for knit goods will be produced. As the thread after escaping past the shoulder fr' of the upper limb of the'wire loop r will still be held by the lower limb of said loop, (0W- ing to thedirection the thread takes in running from said loop upward and forward past the front edge s' of the plate S,) 4the thread will be restored to proper position to repeat the above-described operation when the takeup loop r moves forward in unison with the looper. It will thus be seen that I not only provide a take-up device for the lower thread which is moved in unison with the looper, but I also provide a take-up device which is in a measure intermittent in its action, 'so that a slack-stitch seam may be produced. The timing of this slackening of the take-up action of the looper-thread may be varied by providing interchangeable plates S, having slots s of varying inclinations, or by any suitable or wellknown means of adjustment of the plate S, as will be readily understood.

My improved machine is preferably provided with a trimming mechanism, which, as herein shown, consists of the blade q, carried by the trimmer-bar Q, connected to an arm at the forward end of a rock-shaft T, journaled in the overhanging arm A and having an arm at its rear end connected by a pitman t with an eccentric on the drivingshaft B. The throat-plate W is 4provided with a removable stationary blade w, cooperating with the movable blade q in the usual man-ner.

The hol-low work-supportingarma2 is open at its top for access lto the looping mechanism, and is provided with a longitudinallyextending coverplate U, hinged at its rear end at u to the machine-frame at Lthe rear end of said arm, said hinge being transverse to said arm, so that said plate maybe lifted, denoted by dotted lines in Fig. 1.

Having thus described my invention, I claim and desire to secure by Letters Patent- 1. In a doublechainstitch sewing-machine, the combination with the needle-bar and its operating-lever C, having thedepending farm c3, of the looper-rod E connected to saidfarm, the looper carried by said rod, the short rockshaft D at the forward end of the Work-support and having a jointed guide or support through which said rod-extends and in which itreciprocates, and means for ,positively rockmg said shaft in both directions to impart IIO positive back-and-forth lateral movements to said looper-rod and looper.

2. The combination with the needle-bar c', of the operating-lever C having the depending arm c3, the looper-rod E jointed at its rear end to said arm and provided at its front end with the looper e2,the rock-shaft I) having the arm d and the forked arm d', the sleeve e through Which said looper-rod extends and which is jointed to and supported by said arm d, and the driving-shaft B having an eccentric h Working in the fork of the said arm d' and serving to impart positive movements in both directions to said rock-shaft.

3. In adouble-chain-stitch sewing-machine, the combination With a needle and a looper and their operating mechanism, of a looperthread-take-up device movable in unison With the said looper, as the latter is reciprocated longitudinally, said take-up device having a cast-off shoulder, and a plate having an inclined slot through which the looper-thread runs, said inclined slot being so arranged as to cross the plane of movement of the said cast-off shoulder on said takeup device.

4. A take-np mechanism for double-chainstitch sewing-machines consisting of the combination with the needle-bar-operating lever having the depending arm c3, of the Wire loop or device r attached to said arm and having the shoulder r', the plate P having the slot or opening p and the Wire loop p, and the plate S having the inclined slot s so arranged as to cross the plane in which said shoulder r travels as said loop or device 1' is moved back and forth with said arm c3.

5. The combination With the driving-shaft B having the eccentric b2, of the yoke F embracing said eccentric and having the slotted arm f, the rock-shaft G having an arm g to which said arm fis pivoted near the Aend of the latter, said shaft G having at its forward end the arm g', the feed-regulating lever H pivoted to the machine-frame and having a pin or stud extending into the slot of the arm f, the horizontally-movable block or slide I having lugs or parts embracing a portion of the said arm g', the slide or blockK vertically movable in the said slide or block I and carrying the feed-dog k, and the eccentric b for imparting vertical movements to the said slide or block K.

6. The combination with the needle-bar c', of the operating-lever C having the depending arm c3, the looper-rod E jointed at its rear end to said arm and provided at its front end with the looper e2, the rock-shaft D having the rear arm d and the front forked arm CZ', the latter being provided With the plate d2 having the loop-forming linger cl3 which extends past the needle on the side thereof oppositeto that from which the said looper takes the loops of needle-thread, the sleeve e through which said looper-rod extends, and Which is supported by said arm d, and the driving-shaft B having the eccentric Z9 Working in the fork of the said arm d and serving to rock said shaft D.

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

ELIAL M. STAPLES.

lVitnesses:

HENRY CALVER, J. F. JAQUITH.

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