US1115926A - Sewing-machine. - Google Patents

Description

J. GREENWOOD. SEWING MACHINE.

APPLICATION FILED APR.9, 1914.

1 1 1 5,926. Patented Nov. 3, 1914.

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J. GREENWOOD.

SEWING MACHINE.

APPLICATION FILED APILQ, 1914.

1,1 1 5,926. Patented Nov. 3, 1914.

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, UNITED STATLQQAIENT OFFICE.

JOSEPH GREENWOOD, OF PITTSFIELD, MASSACHUSETTS, ASSIGNOR OF ONE-HALFEO PERRY E. MILLER, OF PITTSFIELD, MASSACHUSETTS.

SEWING-MACHINE.

Specification of Letters Patent.

Patented Nov. 3, 1914.

Application filed April 9, 1914. Serial N 0. 830,791.

To all whom it may concern Be it known that I, J OSEPH GREENWOOD, a subject of Great Britain, residing at Pittsfield, county of Berkshire, and State of Massachusetts, have invented certain new and useful Improvements in Sewing-Machines, of which the following is a specification.

The invention relates to such improvements and consists of the novel construction and combination of parts hereinafter described and subsequently claimed.

Reference may be had to the accompanying drawings, and the reference characters marked thereon, which form a part of this specification. Similar characters refer to similar parts in the several figures therein.

Figure l of the drawings is a top plan view of an over-edge sewing-machine, partly broken away, showing the presser-foot-bar in horizontal section. Fig. 2 is an end elevation of the same. Fig. 3 is a front elevation of the same. Fig. 1 is a view similar to Fig. 1, illustrating the movement of the A work-plate and the stitch-distending finger.

Fig. 5 is a plan view of an edge portion of a piece of knitted fabric ornamented by over-edge stitching as applied by means of my invention. v

This invention relates to a type of sewingmachine, commonly known in the art as the Merrow machine, adapted for forming an ornamental scalloped edge on knitted fabrice by means of a succession of groups of over-edge stitches crocheted together along their outer edges from group to group, the stitches in each group extending fanwise from points within the body of the fabric to points more or less outside of theedge of the fabric to produce the desired scalloped effect.

The principal object of the present invention is to accentuatethe scalloped eifect produced by a machine of said type.

Referring to the drawings wherein the in vention is shown in preferred form, 1, represents the bed-plate of the machine; 2, the needle; 3, the looperor supplemental threadcarrier; and #1, the crochet-hook or latchneedle for crocheting the over-edge stitches together.

The work is fed along the bed-plate, 1, or a work-plate, 5, bytoothed feed-bars, 6, which play through slots, 7, in the workplate. The feed-bars, 6, are carried by a slide, 8, adapted to reciprocate longitudinally in a slideway formed in a lever, 9, pivoted at 10, upon the base, 11, of the machine, said slide, 8, having a pin, 12, projecting out through a slot, 13, in the slideway-lever, 9, which pin, 12, is engaged by the forked end, 14:, of a lever, 15, fulcrumed at 16, upon the base of the machine. A pitman, 17, connects the intermediate portion of the lever, 15, with an eccentric, 18, fixed upon the main drive-shaft, 19, upon which shaft is also fixed a pinion, 20, which engages a gearwheel, 21,- on the shaft, 22; The pinion, 20, is much smaller than the gear-wheel, 21, and

causes the slide, 8, and feed-bars, 6, to be ,6, are effectiveto feed the work only when they are projected above the level of the work-plate, 5; and in the operation of the machine the feed-bars, 6, are held depressed belowthe level of the work-plate, 5, during the formation of each'group of stitches intended to form a scallop on the edge of the fabric,and is then projected fora brief interval above the level ofthe work-plate to quickly cause a feed-movement of the work of approximately the length of a scallop. The feed-bars, 6, are thus raised at intervals by means of'a lever, 23, pivoted at 24, upon the base of the machine, said lever having a projecting finger or pin, 25, which'engages a plate, 26, adjustablyfixed upon the slideway-lever, 9, said lever, 23, having a laterally projecting finger or pin, 27,1ocated in thepath of a cam, 28, fixed upon the shaft, 22. Except when the cam, 28, is in engagement with the pin, 27 the slideway-lever, 9, rests in the position in which it is shown in Fig. 2, in which position the feed-bars, 6, are depressed below the level of the workplate, 5; but at each engagement of the cam, 28, with the pin, 27, the lever, 23, slidewaylever, 9, and feed-bars, 6, are elevated, thereby forcing the teeth of the bars, 6, up above the level of the work-plate, 5, into engage ment with the work to feed the same.

The construction and manner of operation of the parts thus far described are old and well understood in the art; and further description of the same will be unnecessary, it being understood that the needle, looper and crochet-hook operate continuously to form' and crochet together the over-edge stitches while the work is, at the completion of each group of stitches, fed past the needle a distance equal to the length of a scallop.

In carrying out my invention, I provide for a reciprocating movement of the tapered stitch-distending finger, 29, in a direction parallel with the direction of the feed-movement of the work; and for a reciprocating motement ofthe work-plate, 5, in a direc-' tion at right angles to the direction of the feed-movement of the work.

In the preferred form of my invention shown in the'drawings, the work-plate, 5, ismounted in a slideway, 230, in the bedplate', andfhas, depending from its under side, a cani-followerl'il, which engages cam-gjrooi'e, 32, in a cam, upon the shaft," 22.

The cam-groove, 32, is so formed that at the: beginning and end of' each scallop formed'by" the machine, the work-plate, 5, will occupy its innermost position, as shown in lfig. 1, from which position it is gradually moved outward until one-half of the scallop is formed and then is gradually moved inward as the other half of the scallop is formed. This reciprocating movement of the work-plate is sufficient to'cause a slight reciprocating movement of the work sidewise relatively to'the p'resser-foot, 34, and needle, 2, which causesthe needle to pass through theworlr slightly nearer the edge of the work during the formation of the stitches at the middle of the scallop than during the formation of the stitches at the ends of the scallop, thus permitting the stitches at the middle of the scallop to extend to afgreate'r distance outside the edge of thdfabridthan they would if the work wasnot so shifted.

"Thetapere'd stitch-distending finger, 29, over which the stitches are formed is carried by a slide-bar, which reciprocate's in a slide'wa'y, 3.6, 'formed in the bed-plate, 1, parallel with the direction of feed-movement o'fithe'worln i As a'means for reciprocating the slidebar, 35, I provide the same with an oblique sli'dew'ay-groovef37, adapted to receive an obli'qi' el eitending finger, 38, mounted uponfa'nd carried by thework-plate, 5, whereby, aistlie wo1-kpla'te,5, ismo'ved outwardly, the slide-bar 35, and tapered finger, 29, will be'moved inwardly'to bring a wider part of the tapered finger, 29, opposite the needle; and as the work-plate, 5, is moved inwardly the slide bar, 85, will be moved outwardly to"brin g the narrower part of the tapered finger, 29., opposite the needle. The tapered fiiigeli, 29, thus acts to distend the stitches formed over it, to a greater degree at the middle of. each scallop than at the ends thereof, and in so doing, it cooperates with movableworlnplate, 5, to distend to the qreatest degree the stitches, which, due to the inovement of the work-plate, 5, are inserted nearest to the edge of the fabric, with the result that the stitches at the middle of each scallop are made longer than the stitches at the ends of the scallop. The scallops are thus accentuated, made more prominent, and are better defined than when the stitches are all of the same length and all pass through the fabric at the same distance from its edge, in which case the scalloped effect is due entirely to the fan-wise arrangement of the stitches.

The oblique finger, 38, preferably has a slotted-shank, 39, whim is attached to the work-plate, 5., by means of a set-screw, 40, whereby the position of the finger relatively to the slide-bar, 35, can be adjustably varied to properly time the movement Of the tapered finger,29, to accord with the movement of the work-plate,

It will be under'stoo'd that the movable tapered, stitch-distending finger, 29, and the movable worl r-plate, 5, eachof itself tends to accentuate the scalloped formation. By their combined use, however, I am' able to obtain greater accentuation (if the scalloped formation than with either the movable finger or the movable plate used alone.

Forcertain purposes of the invention, the stitch-distending tapered finger may be reciprocated many known manner and the work-plate, or, device which engages the work and shifts the work sidew'is'e of; the needle,'may be operated in any known manner.

I have shown in the drawings a looper, 3. which'in certain machines of this general type carries a second thread, and is l rnown as a sii pplemental thread-carrier; butI do not wish to b'e'limited to the use of such a looper or supplemental thread car'rier, as.

for certain purposes of my invention any known' mechanism for forming over-edge stitches 'crochetin them'together may be employed in comb nation with my improved means for accentuating the scallops formed, by the machine.

What lclaim, as new and desire to secure by Letters Patent is i 1 in a machine of the class described, and

in combination, over-edge-stitch-forming 'inecl1anisn1,'including a needle and a crochet-hook; means for intermittently feeding the workup'on the completion of'each group of stitches; a work-engaging member movable transversely of the direction of feedniovement ofthe work; and means for automaticallyimparting to said member a reciprocating movement in the" interval between 'successive feed-movements of the work.

2. In a machine of the class described, and in combination, over-edge-stitch-forming mechanism, including a needle "and a crocheteliook, means 'for intermittently feeding the work upon the completion of each ,zgroupof stitches; a pair of work-engaging members comprising a work-plate' and a resserfoot, one of said members belng movable relatively to the needle transversely of the direction of the feedmovement; and means for automatically imparting to said movable member a reciprocating movement relatively to the needle in-the interval between successive:feed-movements of" the work; a tapered stitch-distending finger over Which the stitches are formed; and means for automatically imparting to said finger a reciprocating movement in the interval between successive feed-movements ot the work.

4:. In a machine of the class described, and

over-edge-stitch-forming mechanism, including a needle and a. croin combination,

chet-hook; means for intermittently feeding thework upon the completion of each group of stitches; a Work-supporting plate capable ofmovement at right angles to the direction of feed-movement of the work and provided with openings to receive the said work-feed 111g means; and means for automatically imparting to said. plate a reciprocating move- 5. In a machine of the class described, and

in combination, over-edge-stitch-forming mechanism, including a needle and a crochet-hook; means for intermittently feeding the Work uponthe completion of each group of stitches; a Work-supporting plate capable of movementat right angles to the direction of feed-movement of the Work and provided With openingsto receive the said work-feed 11181113 in-the interval between successive feed-c v movements of the Work.

ing means means for automatically imparting to said plate a reciprocating movement in the intervalbetvveen successive feedmovements of the Work; a movable, tapered stitch-distending finger over which the stitches are formed; and a member carried by said- Work-plate engageable with said taperedstitch-distending finger to reciprocate the linger in accordance with the reciprocating movement ofthe Work-plate.

In testimony whereof, I have hereunto set my hand this 3rd day of April, 1914.

' JOSEPH GREENWOOD.

Witnesses: j I q n V J OSEPH A." PFEIFFER,

FRANCIS M. CALLANAN,

copies of this patent may be obtained for five mama, by addressin g the Commissioner of Patents,

' Washington,0. I I Y a

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