US678908A - Sewing-machine attachment for overedge-stitching. - Google Patents

Description

Patented July 23, MN. T. H. ROSS &. E. DONALDSON. SEWING MACHINE ATTACHMENT FOB OVEBEDGE STITGHING.

(Application filed Feb. 1, 1901.) ,(No Model.) 3 Sheets$heet l.

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No. 678,908. Patented July 23, mm.

T. n. 808$ & E. DONA'LDSON. SEWING MACHINE ATTACHMENT FUR UVEREDGE STITOHING.

(Application filed Feb. 1, 1901.) (No Muriel.) 3 Sheets-Sheet 2.

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No. 678,908. Patented July 23,-l9fll.

T. H. 8088 &. E. DONALIJSON.

SEWING MACHINE ATTACHMENT FOR OVEREDGE STiTCHiNG.

(Application Bled Feb. 1.1901. (No Model.) 3 Sheets-Shoat 3. v

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UNrrED STATES 1i union.

PATENT THOMAS H. ROSS AND EDWIN DONALDSON, OF BROOKLYN, NEW YORK, ASSIGNORS TO THE ROSS ATTACHMENT AND MACHINE COMPANY, OF

NET/V YORK, N. Y.

SEWlNG-MACHINE ATTACHMENT FOR OVEREDGE-STITCHING.

SPECIFICATION forming part Of Letters Patent No. 678,908, dated July 23, 1901. i I Application filed February 1 1901. Serial No. 45,626, (No model.)

To aZZ whom it may concern:

Be it known that we, THOMAS H. ROSS, a subject of the King of Great Britain, and EDWIN DONALDSON, a citizen of the United States, both residents of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Sewing-Machine Attachments for Overedge-Stitching, of which the following is to a full, clear, and exact description, such as will enable those skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming a part of this specification.

The invention relates to improvements in sewing-machine attachments of that class which are used for intermittently diverting the course of the fabric from its path of travel through the line of reciprocation of the needle for the purpose of forming overedge-stitches,

and it more particularly relates to improvements in the attachment disclosed in the application for patent filed by us October 2, 1900, and which bears Serial No. 31,771.

The invention consists in the novel con-. struction, combination, and arrangement of parts, such as will be hereinafter fully described, pointed out in the appended claims, and illustrated in the accompanying drawings.

In the drawings, in which similar reference characters designate corresponding parts, Figure 1 is a perspective view of an attachment embodying the invention. Fig. 2 is a sectional view on the line 2 2 of Fig. 3 and on the line 2 2 of Fig. 7. Fig. 3 is a similar view on the line 3 3 of Fig. 2 and also on the line 3 3 of Fig. 7. Fig. 4 is an enlarged detail perspective view showing the pusher-bar. Fig. 5 is a front elevation of the attachment. Fig. 6 is a detailsectional view showing the presser-foot. Fig. 7 is a top plan view of the attachment. Fig. Sis a bottom plan view of the same without the presser-foot. Fig. 9 is a sectional view on the line 9 9 of Fig. 11. Fig. 10 is a similar view on the line 10 10 of Fig. 12. Fig. 11 is a plan view of the attachment without the presser-foot, showing the pusher-bar in an advanced position forcing the fabric out of the line of reciprocation of the needle. Fig.

guide-block in a straight line.

12 is a similar view showing the pusher-bar retracted and the fabric in its original position. Figs. 13 and 14 are detail sectional Views respectively showing the pusher-bar in advanced and retracted positions in'making serging stitches. Fig. 15 is a plan View showing the attachment as it appears in making serging stitches.

Only so much of the sewing-machine is shown as is necessary to illustrate the operation of the attachment. The work-plate A, the needle-bar A, and the presser-foot bar A may be of any construction suitable in the premises. In the needle-bar is secured the usual needle A by the set-screw A On the lower end of the bar A is attached the presser-foot, which will be hereinafter particularly described. On the work-plate A is secured the attachment adjacent to the presser-foot and needle-bars, and also in such a position that the work-face of the base B will be contiguous to the line of travel taken by the fabric being stitched.

Mechanism is provided for adjustably securing the attachment to the work plate. The base B has an extension B, provided with a recess B through which the screw 13 is adapted to pass and by clamping the base between its head and the work-plate serves to hold the attachment in place. The shank of the screw passes through an opening in the end of the guide-block B located in the recess B The shank of the screw fits snugly in the opening, so that the block will have as little play as possible relatively to the screw.

A second screw B passes through the'guideblock and serves to clamp the latter to the work-plate. By means of the block and the two screws the attachment can be secured to the work-plate so that it can move only in a straight line.

Means for moving the attachment relatively to the guide-block are furnished. A screwthreaded rod B extends from the guide-block and is engaged by the thumb-nut B The latter has a collar B journaled in the recess B in the extension B. By turning the thumb-nut when the screw B is loose the attachment can be moved relatively to the A considerable turning of the thumb-nut, according to the pitch of the engaging screw-threads, will move the attachment but slightly. Consequently quite an accurate adjustment of the attachment relatively to the line of reciprocation of the needle can be secured. This is required to adapt the device to fabrics of different thicknesses.

The work-face of the base has, as shown in the drawings, preferably two surfaces O 0*, respectively relatively inclined to each other and meeting at the recess 0 in the line of reciprocation of the needle. The face 0', be-, ing the face on the feeding-in side of the attachment, is inclined relatively to the direction in which the fabric is moved by the feed mechanism across the work-plate. The ob jectin havingthe face 0 thus inclined is; to

insure the proper presentation of thefabricv to thefne'edle on the return of the .latterlto, normalv position after displacement, by the, p'u'sherrbar. we have found that where the face 0 on the feeding-in side of theattachment is straight or parallel with the direction.

of the line of the. feed and the machine operated at a high rate of speed all fabrics will not, invariably spring back quickly enough nor far enough after they have been released by the pusher-bar to insure such hold by the. By pulling.

stitchas is sometimes desirable. the edge of the fabric into a new directiouas itpas'ses theend of the aforesaid inclined surface, of the work-face on its way to theneedle thematerial is subjected to suchtensionas to cause it more readily and quickly to re.-

sume its. normal position, and thus throw its edge, back past the line of reciprocation of theheedle' after. release by the pusher-bar.

In the lower edges of the surfaces C andC are the grooves C and. 0 respectively. These. grooves, preferably gradually increase in de pfthfas they leavethe recess 0 Their. 1 p drpose is to enable the operator to see the outeredgefof the lower fold of the fabrieto,

afbetter-advantag'e as itis fed into. the at: tachment, and thereby be more. certain that a properpresentation of the foldsismade to the needle, Also,'they insure a slight projection of theedge of thelower fold beyond the other folds, so that the engagementof the threads in the outside stitch will be with-1 inthe fabrictoa slight extent instead of. outside it, as would occur if no such provision were made.

ward its, outer end,; the fabric will. readily, pass'from the attachment. The groovesalso particularly adapt theattachment to serging.

Irithe under side of thebaseB is the'gu'ide;

As the. feeding-in groove 0 is preferablyfdeeper atits outer end, thefabric.v willreadily, enter the same, and as it. de-i creases indepth toward itsinner end the fab way D, leading to the recess 0 and also to the meeting place of the surfaces 0 and 0 In this guideway is mounted the pusher-bar D, so that it can be intermittently projected into the path of travel of the fabric and into the line of reciprocation of the needle. At its forward end-the pusher-bar is bifurcated, .as at D to register with. the needle when the latter descends when the pusher-bar is in an advanced position. It is also recessed, as at D to register with the grooves C and 0 when it is in a retracted position. It is held in place and its movement is limited by the plate D engaging with the recess D in its under side. Projecting from the sides of the pusher-bar are the extensions D and D respectively, which extend upwardly through the recess D in the base. The pusher-bar is reciprocatedby the three-sidedcam E, rotatably mounted between the extensions D and-D The cam is mounted onv the end of the .trundle-wheeLE' and turnswith thelatter. The trundle-wheelhas six spokes, one for eachangle, and each side ofvtlie cam, so that by intermittentlyturningthe same onesixth ofra rotation the angles and sides are alternately and-successively brought to bear spring D securedto the rear extension D so'as to. reciprocate the pusher bar back and forth. The, spring 'D interposed between the cam and theextension D serves to take whentheattachment is. runat a high rate of speed, To prevent the. trundle-wheel from ioverrunnihg, a spring D secured to the base, bearsonthe spokes. This spring not only act-sas. a brake, but italso serves to turn the wheel slightly by its ca m-face. D bearing on }a spokev after the wheel has been turned to a certain point.

v Mechanism is providedfor conveying motion fromtheneedle-bar to the tru ndle-wheel to, rotate the latter. On the baseB is mounted the standard F, and in. the face of thelatteristhe vertical guideway F-,in which moves the slide-bar F from the upper end of which projects the. arm F The latter has a downward extension F which can be cut to accommodate the attachment to .machines of different makes. Theslide-bar is normally depressed by the spring F secured .to the standard. It is reciprocated-vertically and against theaction of the. spring .by the .setscrewAi, carried by the needle-bar engaging with the extension F as the machine is operated. To the lower end of the slide-bar is pivoted the pawl ,F, the, lower end of which islnormallypressed toward the trundle-wheel bythe springl i, which also tends to press theflower end of the pawl is such that on its upward movement itiwill engage with one of the spokesofthe trundle-wheel andon its downward. movement willdisengage. The

on the, forward extension D and onv the up anylost motion and also to prevent noise theslide-bar downward. The formation of.

upper end of the pawl is bifurcated and fits over the lower end of the slide-bar. The members of the bifurcation by striking against the slide-bar limit the movement of the pawl about its pivotal point. By the reciprocation of the pawl the trundle-wheel is given one-sixth of a complete rotation at each upward movement, so that an angle and a side of the cam are successively brought to bear on the forward extension D and the spring D and the pusher-bar thereby reciprocated. The movement of the slide-bar is limited by the arm F striking the upper end of the standard and the upper end of the pawl striking the lower end of the guideway.

In attachments of this kind much trouble is experienced in working seamed fabrics, for when one of the latter is folded where the seam occurs it is quite difficult to pass it beneath the ordinary presser-foot. To overcome this difficulty, a special presser-foot is provided. To the lower end of the rod A is attached the casing H, and the latter has pi voted to an end the bell-crank H. In the upper part of the casingis the chamber H and located therein is the spring H bearing on the upper" end of the bell-crank and normally pressing it outwardly. To the lower end of the bell-crank is pivoted the shoe H The pivotal connection between the bell-crank and the shoe is such that the latter can be rocked only to a limited extent. The shoe has considerable length and is recessed at H to receive the fabric and the end of the pusherbar. When the seamed part of the fabric approaches the shoe, owing to the latters length and longitudinal curvature it passes beneath the forward end and rocks the shoe to a limited extent. As it moves beneath the shoe the latter not only rocks to accommodate it, but also moves upwardly against the action of the spring H pressing on the bellcrank. In this way the fabric is not only pressed evenly against the feed-dog, but the seamed portion is passed along without interference.

Means are provided for connecting the presser-foot with the attachment, so that their proper relative adjustments can be secured. Transversely through the casing H an opening extends, and in the same is placed the horizontal arm H of the angular rod H This arm is held in place in the casing by the set-screw H The vertical arm H enters the vertical opening H of the extension H of the base. As the distance between the needle and resser-foot bars varies in different machines and even in machines of the same make and pattern, means are provided for accommodating the attachment to such variations. In the opening H and around the vertical arm H is the eccentric-sleeve H provided with an arm H for turning the same. By rotating the sleeve more or less the presserfoot can be moved relatively to the attachment, so that it can be attached to the presserfoot bar after the attachment has been secured in the proper position relatively to the needle-bar. A set-screw H is provided for securing the sleeve in place.

The operation of the device is as follows: After the attachment has been secured and adjusted the operator folds the fabric to suit the desired stitchfor example, it is folded for blind-stitching, as shown in Figs. 9 to 12, inclusive. When folded properly, the edge of the lower fold should project beyond the upper folds, so that when the fabric is fed to the attachment the said edge enters the groove 0 in the work-face.v As the operator can always see the edge of the lower fold until it enters the groove, he will know that up to that point at least the fabric will be folded properly. The relative positions of the folds will also be preserved as the fabric passes the pusher-bar, owing to the recess D in the latter. When the pusher-bar is in a retracted position,the recess will register with the groove, and when it is in an advanced po sition the edge of the fold engages with the recess, and thereby the relative positions of the folds are preserved. As the direction of its path of travel is changed as it approaches the pusher-bar, the fabric will be pulled and pressed against the inner terminal of the inclined surface 0 of the work-face of the base. This angular tension of the material at the point referred to causes it to spring back underneath the needle when released from the compression of the pusher-bar on the retraction of the latter. Furthermore, the grooves in the surfaces of the work-face particularly adapt the attachment to serging. Such an application is shown in Figs. 13, 14, and 15 of the drawings. It is obvious that the device can be adapted to the making of stitches of otherpatterns.

WVhile we have shown in that example of our attachment illustrated by the drawings a work-face having two relatively-inclined surfaces, it should be understood that one of said surfaces which extends beyond the needle is not essential to the above-described operation of our device and does not necessarily participate in the formation of the stitch and seam and that the value of the inclination of the surface against which the fabric is pushed on its way to the needle does not depend upon its relation to the surface of the work-face beyond the needle, but upon the relation of that inclination to the direction of the movement of the fabric caused by the feed and the retraction of the pusher-bar.

Having thus described our invention, what we claim, and desire to secure by Letters Patcut, is-.

1. In a sewing-machine attachment, a base provided with a work-face formed of two relatively-inclined surfaces, a pusher-bar mounted in said base and adapted to be projected tively-inclined surfaces and having grooves at the lower edges of said surfaces, a pusherbar mounted in said base and adapted to be projected through said work-face at themeeting-placeof said-surfaces and having arecess adapted to register with said grooves, and means for reciprocatingsaid' pusher-bar.

4. Ina sewing-machine attachment, thecombination of a presser-foot provided with means for attaching the same to a bar and' having an opening through the same, the base.

of anattachment provided with a bearing, an eccentric sleeve journaled in saidbearing, means for turning said sleeve, a-rod having one end inserted in the opening in t-he presserfoot and the other end in said sleeve, and

means for securing said rod in place.

5. In a sewing-machine attachment, the

combination of apresser-foot provided with means for attaching it to a bar and having an opening through the same, the base of an attachment'provided with a bearing, an eccentric sleeve jou-rnaled in said bearing, an

arm carried by said sleeve for turning thesame a set-screw passing through said base. and impinging on said sleeve for securingthe' latter in its adjustment, a rod having one end inserted "in the openingin the resser-foot and the other end in said sleeve, and means for securing said rod in place.

6. In a sewing-machine attachment, a base provided with a guideway, apusher-barmovable back and forth in said guideway, a shoe carried adjacentto said base and provided with a recess adapted to register with said pusher-bar when the latter is projected beyond said base, a casing provided with means forsecuring it to a bar, a bell-crank pivoted to said casing and at the end of one of its arms pivotally connected with said shoe, and a spring in said casing bearing on the free end of the other arm of said bell-crank.

7. In a sewing machine attachment, a pusher-bar movable back and forth, exten sions carried by said pusher-bar,a cam mounted between said extensions adapted to bear on one of said extensions, a spring secured to the other of said extensions and interposed between the latter and said cam, and means for rotating said cam.

8. In a sewing-machineattachment,a guideblock, a clampingscrew passing through said guide-block for securing the same to a workplate, a base provided with a recess adapted to register with said guide-block, a rod connected with said guide-block, a' thumb-nut journaled in said base and engaging with said rod, and a clamping-screw passing through said base and said guide-block for securing the same to the work-plate. v

9. In a sewing-machine attachment, a movable pusher-bar, a cam engaging with said p-usherbar to reciprocate the same, a trundlewheel for rotating said earn, a slide-bar, a pawl adapted to' engage with said trundle- W-heel pivoted to said slide-bar with its connected end bifurcated and registering with the slide-bar to limit the movement of said pawl, and means for reciprocating said slidebar.

10'. In a sewing-machine attachment a base provided with a work-face the surface of which on the feeding-in side of the attachment is inclined relatively to the direction of the'feed of the goods'and havinga groove at the lower edge of said surface, a pusher-bar mounted in said base and adapted to be projected through said Work-face near the termination of said inclined grooved surface, and means for reciprocatingsaid pusher-bar, substantially as and for the purposes described.

11. Ina sewing-machine attachment, a base provided with a work-face, the surface'of which on the feeding-in side of the attachment is inclined'relatively to the direction of lhe feed of the goods and is provided with a groove, a pusher-bar mounted in said base, and adapted to be projected through said work face near the termination of said grooved'inclinedsurface and having a recess adapted to register with said grooveand means for reciprocatingsaid pusher-bar, substantially as and'for the purposes described.

12.- In a sewing-machine attachment a base provided with a work-face the surface of which in the feeding-in side of the attachment is inclined relatively to the direction of the feed of the goods, a guideway in said base, a pusher-bar movable in said guideway, a standard mounted on said base and provided with a guideway and a slide-bar movable in the guideway of the standard, and adapted to be' reciproc'ated by the needle-bar and mechanism for conveying motion from said slide-bar to said pusher-bar to reciprocate the latter through said Work-face near the termination-of said inclined face thereof, substantially as and for the purposes described.

13. In a sewing-machine the combination of a stitching mechanism, a feeding mechanism, a presser-foot, and an attachment having a base provided with a work-face the surface of which in the feeding-in side of the attachment is inclined relatively to the direction of the feed of the goods, a guideway in said base, a pusher-bar movable in said guideway, a standard mounted on said base, and provided with a guideway, a slide-bar movable in the guideway of the standard, and adapted to be reciprocated by the needle-bar, and mechanism for conveying motion from said slide-bar to said pusher-bar to reciprocate the latter through said Work-face near the termination of said inclined face thereof, substantially as and for the purposes described.

In testimony whereof we hereunto affix our slgnatures in the presence of two witnesses. 1o

THOMAS H. ROSS. EDWIN DONALDSON.

Witnesses:

LINCOLN McCoRMAoK, T. F. FAY.

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