USRE5752E - Improvement in sewing-machines - Google Patents

Description

3 Sheets--Shset l."

y W. MUIR. Sewing-Machines.

Ressued Feb.3, 1874.

n. n I

3 Sheets--Sheret 2.

w. Mum. Sewing-Machines.

Reissued Feb. 3,1874

INYENTOR. y b'w, 7km/M,

l Messrs.

NITED WILLIAM Moin, or MONTREAL, canti-inn;Y

IMPROVEMENT IN s'EwiNG-MAcH'iNEs.

specification forming pim of Leners Pate-iin No. 89,064, usted april 2o, 1ste reissue No. stese, daim Y February e, 1874; application nieu April s, '1812. y

To all whom it may concern; s Be it known that I, VViLLiAri MUIR, of Montreal, in the Province of Quebec and Dominion of Canada, have invented an Improvement in Sewing-Machines, of which the following" is a specification: 0

This invention more especially relates to einbroidering or quilting fabrics, and it will be particularly described with reference thereto, wherein the goods are moved along to the needle by the feed acting at vregular intervals with regard to the stitching mechanism-#that is, feeding at each and every stitch.

By the invention the forward feed is automatically changed-that is, made longer or shorter as to the length of its stroke-which' obviously relatively increases or decreases the length ot' stitch, and the main object of this automatic change of the feed is to secure uniform stitches in a line of stitching' or sewing that from end to end is serpent-ine or simious or zigzag in shape. y Y

My invention consists, iirst, .of a feeding mechanism adaptedto have, a forward and lateral mot-ion, combined with a pattern-cam,

and connected and operating substantially as' hereinafter described, so as to vary the forward motion of the feed for sewing sinuous, zigzag, or other stitches; second, of novel constructions and. arrangements of the mechanical devices aforesaid, to more eifectually secure the main object above stated, all of which will be hereinafter particularly described.

In the accompanying plates of drawings, my improvements in sewing-machines are illustrated.

In Plate l, Figure l is a front view of a machine constructed according thereto. In Plat-e 2, Fig. 2, a transverse vertical section in horizontal section in plane of line y y', Fig. vF 5 Fig. 4, a face view in detail of some of the parts to the machine; Fig.' 5, a plan view of a portion of the machine. In Plate 3, Fig. 6, an end view of the machine.

In the drawings my improvements are shown as applied to a multiple sewing-machine, and

similar letters of reference indicate like parts-.

'A represents the frame of a sewing-machine constructed and arranged according to my improvements, said frame being made of any suitable material, and of any proper form to receive and support the various Working and` the feed-rollers L L. The needle-bar D at each end is adapted to move up and down in parallel ixed guide-posts a a ateach side of the frame A, and to so move it there is hung to each of its ends lone end of a pitman rod or bar, E, both oi'fwhich, at their lower ends, through rollers C, are arranged to work in the cam-grooves b of the cams() of the drivingshaft B. The cani-grooves` b are of such shape as not only to give the up-and-down movement to lthe needle-bar, but to so move Vit at the proper time for the needles d, carried by it, to operate in unison with the other parts of the machine. The needle-bar D at each end is suspended bychains M from the outer ends 'of s}.iring-b'ars N, secured to the upper portion of frame A. suspending the needle-bar D, as ahovedescribed, not only facilitates the upward movement of the ,y needle-bar, but, in a great degree, relieves the cams for operating the needle-bar of friction and Wear and tear. 'Pheneedle-bar D, in addition to carrying the needles, also carries spools of thread, one for each needle. These spools are,l placed on inclinedspindles t of an inclined board, 1 0-,at the rear of the needle-bar, and the threads from lthem pass through eyes 'ofV rods w in a frame, I, at the rear of the needle-bar, and thence through holes ina bar', as, which is attached to the front ends of arms bl", (the rear ends of which arms bf are secured to a shaft, or", in plane of line .r fr, Fig. 1, Plate 1,-' Fig. 3,`a

the frame 1,) passing through clamps d", attached to the upper part of the needle-bar D. and thence to the needleeyes. By the rising of the bar a* with the needle-barD, the proper tension is given to the threads. The shuttle-v carrier frame F in' its construction is adapted to carry a number of shuttles equal to the number of needles which the needleLbar D is y adapted to receive, and itis located in the frame A, upon or in suitable ways thereof, relatively to the races or gnideways j for the'shuttles b2, so as to move the shuttles forward and backward through. their races j. The number Y of, races j equals the number of shuttles, and

they are permanently attached to the frame A in parallel planes at rightangles to the length of the needle-bar l), and, furthermore, are relatively so arranged with the plane of movement of the needle-bar that the shuttles having at their lower ends a frictiouroller, g,

arranged to work respectively in' a similar cam-groove, lr, of disks A2, secured to the driving-shaft B in proper position therefor. The shape of the grooves IL is plainly shown in Fig. 4,1late 2, and is such as to impart to the shuttle-carrier frame F a reciprocating movement to carry the shuttlesforward and backward through their races j in proper time to act in conjunction with the needles to produce stitches.v Each shuttle-race j, upon one side, is provided withl a bent spring, d2, to press against the back of the shuttle moving in the race, and thus to keep the shuttle close to the face of the shuttle-race. This spring d2 is located in shuttle-races j, to hold the shuttle close to the opposite face of the guidc'tl'xerefrom until it has passed into the loop of the needle-thread, thus insuring its perfect and proper entrance to the needle-thread loop, and preventing i wabbling.77 The framing G is in two parts, G2 and G3, connected together by curved metallic bars cx, having ybars fx, that are parallel with therdrivingshaft B. The

`two-part framing G is placed in the machine between the upright sides of the main fra-ine A, and it is considerably less in width than the inside width of frame A, and, when placed in position,has its partG2 at thefront and its part G3 at the rear of the frame A, with the connecting-bars ex passing under the shuttlecarrier frame F. rThe rear part G3 of the framingGis provided with shelves It, m, and n, one above the other, as shown. The shelf Itis to receive the lining material Z,- shelf m, the wadding m; and shelf n, the canvas or other material 0. This is in case the machine is used to quilt lining or wadding for clothing, Sie. From these several shelves, k, m, and n, the respective materials contained by them are passed around suitable guiderollers of the framing `G to a platform or table, G4, of the framing G, so as to bring the wadding m between the lining l and canvas sheet o, with the canvas underneath, producing a, material of three thicknesses. The framing G is/free of the main frame A, and is provided with rollers K, resting on Xed parallel horizontal ways gx of the frame A, so that it can be moved from one side to the other of the'frame A, it receiving motion from the cam O, fixed to the drivin g-shaft B, by and through inechanism c'onstructedand arranged as follows: U, a rod, at one end connected to one of the curved bars ex of the framing G, and at the other pivoted to the pendent bar T, that, in turn, at its upper end, is pivoted to the main frame A, and at its lower end .to one end of a horizontal rod, S, having at its other end a frictiolvroller, q, moving in the groove of 'a cam, Q, (shown clearly in Fig. 1,) on a horizontal shaft, px, arranged in the frame A be; low the driving-shaft B, and in a planeat right angles thereto. The horizontal rod S between grooved cam Q and pendent bar T is supported within an upright bar, rx, resting in its turn upon a friction-wheel, Sx, ofthe frame A. rlhe shaft px, through bevel-gear wheels Ox, is connected to the inner end of a horizontal shaft, lx, turning in bearings of the frame A. This shaft lx, at its outer end, has

a ratchet-wheel, rx, for which is a pawl, mx, hung to a radius-bar, kx, which is loose on the shaft Ix, but is connected at its upper end with armjx of a yoke, P, arranged upon the driving-shaft B in position to be operated by the cam O. The feed-rollers L Ll are arranged upon the front part G2 of the framing G, one directly over the other, and parallel to the needle-bar D. The feed-rollers are in the same vertical axial plane, and the lower roller, L, works in fixed hearin gs, whereas the upper one, L', is arranged in its-bearin gs so that it can be raised and lowered at pleasure, and thus, when desired, removed or elevated entirely from the lower roller, L. To facilitate the raising of the upper roller, L', chains hx are connected to each end of it, and then passed upward over pulleys lx, and the two are there united, so that both ends of the upper roller will be simultaneously' raised.'Y The feed-rollers L L are connected together by gear-wheels tx, so that revolving one roller .revolves the other, and

the lower feedroller is revolved through mechanism connecting it with the cam Z of the driving-shaft. The gear-wheel of the lower feed-roller, L, meshes' into a loose pinion gear-wheel, w x, of a horizontal shaft, V.-

This pinion wx is provided with an elongated hub,Vx,which enters a collar of drum W, and the two are connected by means of a spline, so that the hub Ivx may slide within the drum YV, but the drum and pinion-hub turn together. To the outer end of the drum W is attached a ratchet-wheel, X, operated by a pawl hung to the outer end of an arm, Yx, connected with yoke U, arranged upon the driving-shaft B in position to beloperated Vby the cam Z. A spring, A1, holdsthe inner end of the yoke in contact with the cam Z. l

The presserfoot H (see Fig.2) is of a length equal to the width, or nearly so, of the framing-bar, and it is composed of a transverselycurved plate, n3, attached at each end to strips O O', by which it is secured to the table G4 of framing G, at the rear of needle-bar A, and

ofa rail or bar, fr, disposed to bear along the upper side of plate u2, and secured at each end to the front end of bent spring-bands p p. Through each spring-band p passes the u, and thence under the needle-bar D, over cloth-plate J, to and between the feed-rollers L L', and thence to a take-up roller, operated through a belt connected with some part of the driving mechanism. The cloth-plate J is perforated at proper points for the needles of the needle-bar D to pass through it.

By the several arrangements of mechanism herein described for operating` t-he needle-bar D, the shuttle-carrier frame F, the framing G, and the feed-rollers L L', upon the rotation of the driving-shaftB, motion is imparted to them, respectively, as follows: To the needle-bar, a reci procatin g vertical movement; to the shuttlc-carrier frame, a reciprocating rectilinear movement ,to the fralning G, an intermittent lateralmovement across the plane of travel of the shuttle-carrier frame; to the feed-rollers L L', an intermittent rotary motion.

The dispositions of the several mechanisms provided, as described, to produce the movements above specified of the needle-bar, shuttlc-carrier frame, fabric-carrying framing, and

feed-rollers, is such, relativelyv the one to the other, and the several to each other, as to opcrate the several parts at the proper times to produce, by their combined movement, the stitching of the compound fabric in the direction of its length, and to feed the same, both forward and laterally, under the needle-bar D,

the lateral feed of 'the fabric being insured through the movement of the framing G, to which the fabric is held by the presser-foot H.

It is obvious from the above that the line of stitches in the fabric will be at an angle of inclination to thelength of the fabric, the angle depending` on the shape of the groove in the cam Q, on shaft px, because, through such cam, the framing Gr receives its lateral movement. Therefore, it is plainly manifest, with a proper-formation of the groove of the cam, that the movement of the fra-ming G, at any one throw ofthe ratchet-wheel n", can be regulated, and by using cams of varying shapes, rows or lines of stitches can be made of almost any form or direction-as, for instance, sinuous or serpentine, zigzag, and either continuously or broken, or with a straight or serpentine portion connecting the zigzag. In the lateral movement of the framing G, the presserfoot H, the feed-rollers L L', and the various sheets making the compound fabric, move with-it.

To secure a uniformlength of stitches in the operation of the sewing-machine above described, and which, as has been hereinbefore stated, was the main object of this invention,

'the feed-rollers are adapted to be revolved. either a greater orlesser distance by the ratchet- .wheel X, to feed the fabric forward a greater or less distance, as may be necessary to brin the fabric under the needles, to insurean equal length of stitch. p

The arrangement of parts shown in the drawings to secure the above-described variable feed of the feed-rollers L L' is as follows: B, a bar, made of a wedge shape at; one end, f2, This bar is arranged with its wedge-shaped end uppermost and outside of the end of the main frame A, where the mechanism for operating the feed-rollers is located, and in this position, by means of guide-loops, it is sustained, and rests on one end of a horizontal lever, C,having its fulcrum at ZX, and provided at its other end with a friction-roller, a2, acted upon by the cam-wheel B, secured to the shaft p x, hereinbefore referred to.

The bar B', in its location above described, is, at its upper end, in a plane behind the yoke Y, hereinbefore referred to. The wedge-shaped face f2 of the bar B' is turned toward the yoke. Vith a proper construction of the cam R, it is plainly obvious the bar B' can be raised or lowered, thereby reducing in the one and increasing in the other case the throw of the yoke Y. This results from the fact that the yoke Y is arranged to move across the drivin g-shaft B, and will bevmoved forward more or less, according to the dis. tance it is allowed to recede bythe bar B.

A limitation of the backward movement of the yoke Y, through the cam R acting on the bar B', being thus automatically effected, it follows that the ratchet-wheel X, by the succeeding forward movement of the yoke Y,y will be .rotated in direct proportion thereto-that is,

a lesser or greater number of teeth, as the case may loe-and, consequently, the feed of the fabric will be made accordingly less or more. v i l From theabove description of the arrangement of the bar B, and its operation in connection with the yoke Y, it is manifest that the degree in which the feed can be varied, by each stroke of the pawl, to rotate the feed-rollers L L', depends upon the movement of the yoke Y, carrying said pawl, caused bythe position of the bar B', and that, therefore, as said bar B' derives its movement from the cam R, by changing said cam, and substituting for it another having a different character or form of edge or cam-periphery, the feed will be varied in accordance therewith. Thus, to produce stitches of a uniform or even length-as, for instance, when sewing in a sinuous or serpentine lineit is only necessary to use a cam,

R, of the proper shape to cause the feed to be automatically varied in length at the proper times, and, after each stitch, to bring in connection with the lateral movement the fabric at the proper points under the needles relatively to the points at which the needles last entered the goods, to have the length directly between such iirst and last series to correspond with the length desired for. the stitches,.what ever may be the deviation of such lines of stitches between the two separate points of entry of the needles into the fabric from the longitudinal line or path of the fabric through the parts to work the needle-bar, the shuttle-carrier frame G, and the feed-rollers is precisely the same, Whether more or less sewing-needles and shuttles are employed; and, further, it is plainly apparent th at the machine is adaptedA for the stitching of fabrics other than that herein described.

On the drum YV, hereinbefore lreferred to,

there is iitted loosely a ring, D, having a-pawl, b2, attached to it, which engages with the ratchet-wheel X. The ring D is provided with a handle,E'. This loose ring, with its pawl, is designed to serve as a hand-feed.

I am aware of the Letters Patent issued to D. W. G. Humphrey, of Chelsea, Massachusetts, dated August 29, 1865, numbered 49,627, on improvement on button-hole sewing-machine; and, therefore, I do not broadly claim the automaticyariation of a feed in all sewing-machines; but

M'hat I do claim is- 1. The feeding mechanism, adapted to have a forwardl and lateral motion, combined with a pattern-cam, and connected by means and operating substantially as described, to vary the forward motion ofthe feed for sewing sinuous, zigzag, or other stitches, as set forth.

2. In combination with the cams G C and their operating mechanism, the needle-bar D, suspended from the spring-bars N N, substantially as described.

3. The presser-foot H, consisting-of a curved plate, n2, rail or `bar o', spring-bands p p, and pressureregulating screw S, all constructed, arranged, and operating substantiallyas de-A scribed.

4. The feed-rollersL L', in combination with the pinion WX, keyed on the shaft V, the drum'/V, and ratchet-wheel X, placed loosely on said shaft, and the pawl wx, operated and operating` substantially asshown and de= scribed.

5. The combination ofV the yoke Y, adjust-m ble bar B', and vthecam Z, arranged substantially as described, for the purposeof regulating the feed movement of the rollers LVL.

. 6. The combination of the yoke Y, automatically. adjustable bar B', of taper form, andy cam R, substantially as and for thepurpose specied.

7. The cam Q, arm S, bar T, and rod U, operated through the cam O, yoke P, pawl m", and bar kx, substantiallyas described, for the purposespecified.

S. The framing Gr, composed of the parts G2 and G3, with the parts G3 provided with shelves WM. MUIR.

Witnesses A. HELLEWELL, R. COCKBURN.x

through the cam Z and yokeY, all arranged n kor tables, substantially as and for the purpose

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