US2682844A - Sewing attachment for welt seams - Google Patents

Description

y 1954 H. R. M PHERsoN 2,682,844

SEWING ATTACHMENT FOR WELT SEAMS 3 Sheets-Sheetwl Filed Aug. 25, 1952 HOWARD R. MAC PHERSON! INVENTOR.

HUEBNEILGEEHLER;

- WORREL 8 HERZIG;

A 7'TORNEVS- "0% m y 1954 H. R. M PHERsoN 2,682,844

SEWING ATTACHMENT FOR WELT SEAMS Filed Aug. 25, 1952 s Sheets-Sheet 2 uvmvrm HUEBNER, BEEHL ER,

WORREL s HERZIG,

Z ATTORNEYS- ;y a; a9

110mm n. mc PHEnso/v,

July 6, 1954 Filed Aug. 25, 1952 H. R. M PHERSON 2,682,844

SEWING ATTACHMENT FOR WELT slams 3 Sheets-Sheet 3 HOWARD 1?. MC PHERSON,

a m INVEN TOR.

HUEBNER 9 BEEHLER' .110 10; WORREL l HERZIG,

' TORNEVS- 1 0 Patented July 6, 1954 SEWING ATTACHMENT FOR WELT SEAMS Howard R..MacPherson, Santa Ana, Calif., as-

signor of one-half to Fred J. Dudley, Costa Mesa, Calif.

Application August 25, 1952, Serial No. 306,125

10 Claims. (Cl. 112139) The invention relates to the sewing of welt seams and has particular reference to an attachment especially adapted to folding a welt and fabric over a cord for stitching a welt seam, the attachment being one adapted for use with a conventional sewing machine.

More especially the attachment is one so designed that it can be adjusted to practically any sewing machine and permanently attached thereto in such amanner that it can be moved out of.

the way while the machine is used for ordinary purposes and moved back into position when the machine is to be used for stitching a welt seam.

A variety of sewing machine attachments have been used heretofore in order to fold fabric and material into certain desired positions and thereafter feeding the material thus brought together 7 to a position adjacent the sewing head of a machine. 'F0r themost part such devices as have already been made available are somewhat limited in their character. Moreover, such devices have customarily been designed to fit only certain special machines. In'other devices the arrangement is such as to permit use upon only certain fabrics and welts and cords of only certain weight. .More particularly devices heretofore employed have been inefiicient from the point of view of production, being so designed as to necessitate a considerable amount of handling of the material by the'operator in order to so manage'the' folding and placing of material as tobringit to the sewing head and then with only;a limited degree of accuracy.

It is therefore among the objects ofthe in.- vention to provide a new and improved attach.- ment for a sewing-machine adapted particularly to the stitching of welt seams which is capable of making a complete, neat and firm welt seam in one operation.

Another object of the invention is to provide a new and improved sewing attachment which is capable of folding and aligning a cord, welt and fabric to be attached thereto in such a fashion that the materials are joined and positively overlaid closer than has heretofore been possible to the sewing head, thereby improving the ease of operation of the attachment and effectuating a seam of much higher quality at a rate not heretofore experienced.

Still another object of the invention is to provide a new and improved sewing attachment wherein a cord, welt and the fabric to be stitched thereto is fed to the sewing head both closely adjacent the table of the sewing machine and 2 near the end of the attachment where the pieces emerge in juxtaposition.

Further among the objects of the invention is to provide a new and improved attachment for sewing machines adapted to the stitching of welt seams which is so constructed that it is adapted to be fit and adjusted to virtually any type of sewing machine, the attachment moreover being so mounted that it can be maintained permanently upon the table with removable features employed such that the entire sewing attachment may be swung out of the way when the machine is to be used for ordinary stitching and which may be brought into precise operative position whenever the machine is to be used for the stitching of welt seams.

Still another object of the invention is to provide a new and improved accessory or attachment for the stitching of welt seams which is adjustable within itself in such fashion as to spread passages in the attachment for reception of welt and, other materials while being fed thereinto and then returned to a snug operative position in order to stitch the most effective welt seam, the adjustment further being adapted to facilitate the stitching of welts of a varied degree of weight or gage. The object contemplates employment of a new and improved adjustable device readily accessible to the operator from a position above the attachment and so arranged that the adjustment can be shifted at will to a looser or tighter folding position, and to accommodate a variation in thickness of the welt.

With these and other objects in view, the invention consists in the construction, arrangement and. combination of the various parts of the device whereby the objects contemplated are attained, as hereinafter set forth, pointed out in the appended claims and illustrated in the accompanying drawings.

In the drawings:

Figure 1 is a perspective view of the sewing attachment looking diagonally toward the operator position showing materials folded for a welt seam passing through the attachment.

Figure 2 is a plan view of the attachment in operative position showing a cord threaded through an appropriate portion of the attachment.

Figure 3 is an elevational view of the attachment looking toward the operator position.

Figure 4 is an end view of the attachment.

Figure 5 is a longitudinal sectional view of the attachment taken on the line 55 of Figure 4.

Figure 6 is a longitudinal sectional view of the attachment taken on the line 6-6 of Figure 5.

Figure 7 is a fragmentary cross-sectional view of the attachment taken on the line l'i of Figure 6.

Figure 8 is a schematic representation of the fabric folded over the welt and the welt folded over the cord.

Figure 9 is a View somewhat similar to Figure 8 but showing the several parts after the stitching has been applied.

Figure 10 is a somewhat similar view showing the fabric folded away from the welt to the respective positions those parts would have when the Welt seam is in use.

A sewing attachment of the type herein described is one wherein all materials may be readily fed in a substantially automatic fashion from the attachment to precisely the correct po sition for stitching. Once the materials are threaded into the machine the guiding of those materials to the stitching position should be auto matic to the greatest possible degree, thereby leaving the hands and attention of the operator as free as possible for other work. The feeding should also be in such fashion as to leave a clear and unobstructed yiew of the sewing head so that the operator may be certain that the best possible stitch is being made at all times.

'In the form of the device herein chesen for the purpose ofillustration there is shown a welt seam folding attachment indicated generally by the reference character IQ mounted upon a supporting arm indicated by the reference character I i which in turn is carried by an anchor arm indicated by the reference character 52. Parts of a conventional sewing machine with which the attachment is designed'f er use have been omitted in the interest of clarity. The parts are shown in the positions they would occupy when ready for operation on a sewing machine.

In'the form of my invention chosen for the purpose of illustration the anchor arrn i2 lies in the position it would have when secured to a working table or top surface of a sewing machine, not shown. In the anchor arm is an aperture l9; adapted'to receive an anchor bolt or screw, only one aperture being shown. The table of the machine may be suitably drilled and tapped for reception of a bolt at asuitable location such that the welt seam sewing attachment is located approximately in its proper position adjacent the sewing head.

"In the embodiment selected the supporting arm I i is essentially an L-shaped arm though more properly may be described as constituting 4 one part id having an i. shape and another part l attached to the L-shaped part. The part I 4, namely, the L-shaped part, has a leg i i thereof overlying the anchor arm i2 throughout a por tion of'the length ofthe anchor arm. An outer end ll of the leg i5 is attached to the adjacent end of the anchor arm by means of a pivot screw iii pressing against a dished spring Washer IS, the pivot screw being provided with a suitable shoulder portion 2a permitting it to be tightly secured to the anchor arm. 4 I

Along one side of the leg i 5 is a flange 2i which as shown particularly in Figures 2 and 3 is adapted to abut an edge 22 of the anchor arm, thereb to form a stop, fixing the position of the leg. iE-in alignment with the anchor arm. There is also provided on the leg iii a dimple .23 adapted to fall within a slot 2 thereby to provide a temporary detent holding the leg ie in its position overlying the anchor arm l2 as shown in completely open.

Figures 1, 2 and 3. The other part of the L- shaped supporting arm as heretofore indicated includes properly another leg 25 in two sections such that the straight part l5 forms an extension of the leg. The straight part may be provided with flanges 26 and 27 to center it properly in sliding relationship upon the leg 25. Slots 23 and 25 are provided in the, straight part 15 in which are positioned screws iii! and 3|, these extending through the slots" to the leg 25 in which they are threadedly mounted so that they can be loosened to permit the straight part to be extended o1 retracted and thereafter tightened in plaee At an outer end 32 of the straight part 15 there is mounted a bracket 33 consisting of a flat portion 35 and triangular flanges 35 and 35, there being a plate 37 across the large ends of the flanges so arranged that the plate is tilted with respect to a vertical line.

In the arrangement shown the outer end 32 isprovided with transverse slots 3i} and 39. i The fiat'port ion 34 isfprovide d with anarcuate slot approximately coinciding with the transverse slot 33L Also in the flat portion 351 is a hole 4! which is in alignmentthroughout the length of the transverse slot 3 9. A bolt isfadapted' to extend through"the arcuate slot 4;]; andtransverse slot 33: to a plate 43 onthe underside of the outer end- 32 of-the 'str'aight'pl'art A second bolt 44 extends through thehole'4:! and tranverse slot 39 to the samefpla'te 13. The bolts can be tightened or loosened to anchor or release the bracket upon and from the outer end 32. When released the bracket may be shifted either bodily in a transverse reams or man angular direction, thereby to position the bracket'in a precise manner so that'th'e welt 'seamsewing at tachment may have the desired pbsifibnwith respect to the sewing head of the machine upon which it is mounted.

The sewing attachment proper may be considered as comprisinga core 'or body attached to the. plate 31- by means of-screws 5if The core atan end-edge 52 is provided with a ninety degree arcuate bore 53 forming a cord tube. The cord tube has an outwardly flared admission end" 54 and a discharge or feed end 55. To facilitate guiding the core there maybe provided an additional cord guide tube 56" located at the other end of the core 5!]. The cord-gui'dtube 5-6 is flared to facilitate easy: threading.

Within the core or body is anelongated aperture 51 extending throughout a substantial portion of. the length of the core and throughout its. entire thickness eifectively opening up the center of: the core. The aperture extends in- Wardly. from' an edge 58- ofthe core so that the side of the. aperture. adjacent the plate. '3! is On the upper side of the core and. fitting within the outline: of the aperture 511s a welt folder plate 59, A similar welt: folder plate 6!) lies on the opposite side. of the aperture. A weltv folder 6| overlies and is attached to, the welt folder 6: the welt folder 61 is adaptedto loosely overlie the welt folder 62 so that even though moved apart and outwardly the welt folders will continue to overlie each other completing the formation of a welt tube.

A fiat member overlies the welt folder 6I and also the welt folder plate 59, being secured thereto by means of screws 66. The fiat member has a curved end'portion 61 extending to: a position overlying the outer end of the welt folder 6| in spaced relation thereto forming a space 68 for reception of a fabric sheet, the end part 61 being in effect a fabric guide.

correspondingly there is provided a second flat member 69 overlying the welt folder 62 and welt folder plate 60, there being provided, however, a spacer block I0 for spacing an end part II from the welt folder 62 to provide a space I2 for reception of the fabric. Flat head screws I3 may be employed for holding the various parts Figures 5 and 6. To provide for such movement and also to secure the welt folder plates in position during such movement, there is provided a double parallel linkage consisting of links I8 and I9 parallel to each other extending upwardly and toward the left, as viewed in Figure 6, and links and 8I parallel to each other and extending upwardly and toward the right as viewed in the same figure. Links I8 and I9 are pivoted respectively by pins 82 and 83 to the welt folder plate 59. The other ends of the same links are attached by means of shafts 84 and 85 respectively to stationary portions of the chassis; that is to say, one end of the shaft 84 is mounted in a suitable aperture in the plate 31 and the other end in a suitable aperture in the core 50 at the side walls of the apertureSI. This is aptly illustrated in Figure 5.

Similarly lower ends of the links 80 and 8|, respectively, are secured by pins .88 and 89, respectively, to the weltfolder plate 60; The other ends of the links are mounted by means of shafts and III, respectively, to the same stationary portions of the chassis, namely, the plate 31 and core 50 as seen to good advantage in Figure 5.

Springs 92 and 93 are provided biased in such r fashion that they tend to press the welt folder plates 59 and 60 toward each other.

In order to extend the welt folder plates laterally outwardly and inwardly thereby increasing the size of the welt tube formed by the spaces .1 e 63 and 64, there are provided a pair of cams 94 and 95 mounted upon a shaft 96 at the upper end of which is secured a knob9I. The shaft 96 is firmly secured in a flange 98 at the interior of the core 50 and also secured to a plate 99 overlying the left end of the core. The cam 94 is adapted to be urged against a cam face I09 on the welt folder plate 59 simultaneously with the pressing of the cam 95 against a similar cam face IIII on the welt folder plate 60. The cams are urged against the cam faces by rotation of the knob 91 and when this action takes place the welt folder plates move both endwise from left to right and laterally outwardly in parallel relationship to each other as determined by the parwidening the spaces 63 and 64 where those spaces are parallel to each other and widening the spaces at the endmost edge so that the welt tube thus formed is uniformly enlarged. The spaces 68 and 12 remain the same width but move outwardly so as to position the fabric properly with respect to the enlarged welt tube space. The slots 16 and I1 admit of movement endwise and laterally of the welt folders 6| and 62.

A pointer detent I02 is adapted to set the expansion of the spaces just referred to at predetermined fixed positions by having the pointer fall into respective holes I 03.

In operation the device is first attached to the table on the top of a sewing machine by attachment of the anchor arm I2 as previously indicated. Since the location and arrangement of sewing heads varies considerably among different machines, it then becomes necessary to accurately position the cord tube, welt tube and fabric guides with respect to the sewing head so that the discharge end 55 of the cord tube and appropriate discharge ends of the welt tube and fabric guide spaces lie close to the sewing head and the needle in a horizontal direction. The construction of the bracket 33 is made such that the discharge ends are as close as feasible to the table top of the sewing machine. The adjustment horizontally is achieved in part by loosening the screws 30 and 3I so as to permit an endwise adjustment of the outer end 32. Once the outer end 32 is in proper position the bracket may be shifted angularly in order to have the direction of feed proper by loosening the screws 42 and 44 thereby permitting the bracket to be shifted both transversely and angularly in order to properly orient it after which the screws are tightened in place. The adjustment may be manipulated one or two times, that being sufficient in order to properly position and orient the attachment.

In threading the attachment it is convenient first to thread a cord I04 through the cord guide tube 56 and then through the bore 53 of the cord tube. In order to properly mount and thread a Welt I05 there is provided a bracket I06 attached to the upper side of the core 59 and extending angularly upwardly toward the position of an operator operating the machine and attachment. At the outer end of the bracket I06 there is provided a flange I01 in which is a slot I08 forming a welt guide. A lip I09 may be additionally provided in order to ease the flow of the welt through the welt guide. After the welt has been threaded through the welt guide, it is then passed through the welt tube formed by the spaces 63 and 64. To facilitate threading, the knob 91 may be initially rotated so as to spread the welt folders increasing the size of the spaces 7 63 and 64. After the welt has been threaded through the spaces the knob may be returned to a position closing the spaces to a suitable distance sufficient to permit the free flow of the welt through the attachment.

After this has been accomplished the fabric sheets I I0 and I I I or other material are fed through the spaces 68 and I2 provided for them, the sheets being urged to the bottom of the spaces where their insertion is limited in position by the pins I4 and I5. The relative position of the cord I04, the welt I05 and fabric sheets H0 and III as they are passing through the attachment is illustrated in Figure 8. The parts thus folded emerge from the attachment at approximately the location H 2, illustrated Figure 1, which is adjacent thesewing head of the machine. The folded parts are then stitched with stitches H3 by the sewing head, thereby giving the form illustrated in Figure 9-. As indicated the stitching can be made snug with respect to the cord, so. that a wellformed; welt seam is effected. Following the stitching the fabric sheets may be turned as desired asv illustrated Figure 10.

The movability of the attachment and its mounting is such that when, stitching welt seams around such things as coverings for cushions, hassocks, etc, where the welt seam must be closed, the device can be swung back from the machine thereby permitting the welt cord and welt, to be cut and the seam closed.

Similarly, when the welt stitching has been completed and it is desired to remove the attachmen-t from a position immediately adjacent the sewing head, it is necessary only to swing the attachment arcuately out of the way during which motion the detent 23 is pressed free and the supporting arm moves away-from its position overlying the anchor arm. The attachment may by th-isameans be entirely removed from position adjacent the sewing head and the machine used for otherpurposes. Whenever it is desired to return the attachment to operative position, ity is necessary only to swing. it to the position shown in Figures 1 and 2, which position will bedetermined byabutment of the flange 2'! with the adjacent edge 2-2 of the anchor arm and the supporting arm will be temporarily held in that position by the detent effiectof thedimple 23 in the slot 24.

Under circumstances where it is necessary to stitch welt seams with a welt of greater-thickness, the knob-8-1- may beset to a-w-ider opened position thereby permitting the free flow ofa welt of greater thicknessthrough the device"; Cordsv up to: a maximum diameter may befed through the cord tube but cords of relatively lessdiameter can be effectively stitched in tight relationship tothe folded welt by" reason of the fact that the cord, welt and fabric sheet upon emergencerrom the attachment canbe accuratelypressedinto; snug relationship to thesewinghead of the machine; the attachment: being capable of a sufiiciently fine adjustment to make the stitch firmi automatically eventhough.the-cord'may be of smaller diameter or less compact in body.

It is also possible for the welt folders 5! and: t2 and the welt folder-plates 59 and: Biltobespread by passage of a thickportioneof the'weltthrough the welt tube, as would occur at abias-searn'. The

devicetherefor-e automatically remains uniformly effective institching a snug welttseam regard-less of variations in thickness of the welt.

There has according-1y been provided an exceptionaliy accurate sewing attachment for welt seams and seamsof similar character sufficiently versatile to be capable of stitching tight seams using avaried arrangement of cord, welt and fabric sheets without necessarily resorting to careful manual manipulation by the operator. Should circumstances warrant, the'same attachient may be used with equal effectiveness Without employment-of acord. The-careful-and accurate adjustments built into the machine are sufiicient to enable accurate positioning; in either event.

- While I have herein shown and described my invention inwhat I have conceived-tube the most practical andpreferred embodiment, it is recognized that departures may" be made: therefrom within the scope of my invention, which is: not. to

be limited to the details disclosed herein but is to be accorded the full scope of the claims so as to embrace any and all equivalent devices.

Having described my invention. herein, what I claim as new and desire to secure by Letters Patent is:

1. A sewing machine attachment for stitching welt seams comprising an anchor arm adapted for attachment to atable surface of a sewing machine, a support arm pivotally secured thereto at an outer end thereof providing means for removing the support armfrom operative position, said support arm and anchor arm having a temporary detent therebetween engageable in operating position, the other end of said support arm comprising inner and outer parts adjustable lengthwise with respect to eachother, a chassis having a part thereof attached to the outer part, said last two parts having relatively transverse and angular adjusting means connecting one part with the other, said, chassis including a cord tube extending around one end in ad-irection tilted downwardly toward a stitching position, a welt folder comprising a fiat element spaced from the cord tube oneach side thereof and bent around the cord tube forming a welt tube around the cord tube, and fabric guides comprising separate fiat members located one on each. side of the welt folder and spaced therefrom forming asheet recess between the welt folder and each said flat member and astop stationarily secured to the chassis withinv each sheet. recess. forminga depth gage for the fabric.

2. A sewing machine attachment for stitching Welt seams comprising an; anchor arm adapted for attachment to a table surface of a sewing machine, a support arm pivotally secured thereto at an. outer end thereof providing means: for removing the support arm f-rom operative position, said support arm having a stop thereon adapted tolie against the anchor armwhen in operative position, and a temporary detent between the anchor arm and the leg engageable in. operative position, the other end of said support arm comprising inner and outer parts. adjustablelengthwise with respect to eachother, acha-ssis having a part thereof attached to the outerpart, one of said last two parts having relatively trans-verse arcuate slots and-the. other having coinciding slots forming; a combined transverse and'angular adjustment between said lastv two parts, said chassis having a laterally tilted positionand including acord tube extending around.- oneend, a. welt folder comprising. a hat element on each side of the cord tube spaced therefrom and bent-around the cord tubeforming a welt. tube around the cord tube, fabricg-uidescomprising separate fiat members located one oneach side of the welt folder and spaced therefrom forming sheet recessesoutside the welt-tube-and a stop at-the bottomof each. recess.

3. A sewing machine attachment for stitching welt seams comprising. an anchor armadapted for attachment to. a table surface of a sewing machine, an heshaped support arm having one leg overlying the anchor arm and pivotally secured theretoat the outer end of the leg providing means for removing. the support arm from operative position, said leg having a stop thereon adapted to. lie against the anchor arm when in operative position. and a temporary detent between the anchor armand the leg, another legof said supportarm'comprisingv inner and outer parts adjustable lengthwise with respect to each other, a. chassis, having a part thereof attached to the outer part of the leg, one of said last two parts having relatively transverse arcuate slots and the other having coinciding slots forming an angular adjusting means between said last two parts, said chassis having a laterally tilted position and including a cord tube extending around one end, a welt folder comprising a flat element on each side of the cord tube and spaced therefrom and extending around said cord tube forming a welt tube around the cord tube, fabric guides comprising separate flat members located one on each side of the welt folder and spaced therefrom forming a sheet recess between the welt folder and each said flat member, and a pin extending transversely from one fabric guide to the other forming a depth gage in each recess for the fabric, and a bracket extending outwardly at the input end of the cord tube having a transverse slot therein forming an initial welt guide.

4. A sewing machine attachment for welt seams adapted to fit any one of a number of varieties of sewing machine comprising an anchor arm adapted for attachment at one end in fixed location on the table of the machine, a substantially L-shaped support arm having one leg adapted to I overlie the anchor arm with the outer end of said one'leg pivotallysecured adjacent one end of the anchor arm, the outer end of the other leg being adapted to lie adjacent a, sewing head on the machine, a chassis for guiding sheets of material to a mutually folded position adjacent the sewing head, said chassis including a part having an adjustable connection to a, part of said support arm, said connection comprising means forming an opening in the form of a transverse arcuate slot in one of the parts and means forming a hole in said one part spaced therefrom, and means forming a transverse slot in the other part opposite the arcuate slot and means forming another transverse slot in said other part opposite the hole, bolts extending through and secured in the respectively adjacent slots and hole, and means adapted to adjust the chassis to one of a number of positions relative to the attached one end of the anchor arm, whereby the chassis is adapted to be adjusted to position adjacent the sewing head when the anchor arm is mounted on the machine.

5. A sewing machine attachment for welt seams adapted to fit any one of a number of varieties of sewing machine comprising an anchor arm adapted for attachment in fixed location on the table of the machine, a substantially L-shaped support arm having one leg adapted to overlie the anchor arm with the outer end of said one leg pivotally secured adjacent an unattached end of the anchor arm, the outer end of the other leg comprising a part adapted to lie adjacent a sewing head on the machine, a chassis assembly for guiding sheets of fabric and a Welt to a position around a cord at a point adjacent the sewing head, saidchassis assembly including a part having an adjustable connection to the part of said support arm, said connection comprising means forming a transverse arcuate slot in one of the parts and means forming a hole spaced therefrom, means forming a transverse slot in the other part opposite the arcuate slot and means forming another transverse slot in said other part opposite the hole and bolts extending respectively through the oppositely positioned slots and through the oppositely positioned slot and hole, said other leg having a second part longitudinally extensible relative to the first identified part thereof, whereby the chassis is adapted to be adjusted to position adjacent the 1% sewing head when the anchor arm is mounted on the machine.

6. A sewing machine attachment for sewing welt seams adapted for adjustment to fabric of difierent weights comprising a chassis,'a supporting member adapted to mount said chassis on a sewingmachine in a position adjacent a sewing head, said chassis comprising a body, an elongated core member in the body having substantially parallel flat faces and a curved cord tube at an outside end edge and having a longitudinally disposed aperture therein extending between said faces, welt folder plates fitting opposite sides of the aperture and welt folders on the plates and extending from the respective plates around and spaced from the exterior of the cord tube, pairs of pivoted parallelogram linkages in the aperture, links of each pair being secured at one end respectively to the inside face of one of said folder plates, the other ends of the links being pivotally secured to a stationary portion of the attachment, spring means engaging said folder plates biased to urge said folder plates together, and a spreader between the folder plates comprising an endwise operating pressure member on the chassis in endwise engagement with the folder plates adapted upon endwise movement thereof to shift the welt folder plates endwise thereby to eifect a widening of the space laterally and endwise between the welt folders and the exterior of the cord tube.

'7. A sewing machine attachment for sewing welt seams adapted for adjustment to fabric of different weights comprising a chassis, a supporting member adapted to mount said chassis on the machine in a position adjacent a sewing head, said chassis comprising a body, an elongatedcore member in the body having substantially parallel faces and a curved cord tube at an outside edge an having a longitudinally disposed elongated aperture therein extending between opposite faces, welt folder plates extending over opposite sides of the aperture and welt folders extending from the respective plates around and spaced from the exterior of the cord tube and overlapping each other at the outermost ends, pairs of parallelogram linkages in the aperture, links of each pair being pivotally secured at one end respectively to the inside face of one of said folder plates and at the other end being pivotally secured to a stationary portion of the attachment, spring means engaging said plates biased to urge said plates together, and a spreader for the folder plates comprising cam means on the folder plates, a knob, and eccentric cam means thereon in engagement with the cam means at the plates adapted upon movement thereof to shift the welt folder plates laterally and endwise thereby to effect a widening of the space between the welt folders and the exterior of the cord tube.

8. A sewing machine attachment for sewing welt seams adapted for adjustment to fabric of different weights comprising a chassis, a supporting member adapted to mount said chassis on the machine in a position adjacent a sewing head, said chassis comprising a body tilted angularly upwardly and outwardly toward a machine operators position, an elongated core member in the body having substantially parallel flat faces and a curved cord tube at an outside edge,said core member having an elongated aperture therein, welt folder plates extending over opposite sides of the aperture and Welt folders extending from the respective plates around and spaced from the exterior of the cord tube and overlapping each other at the outermost ends, sheet guides on the Welt plates in spaced relation to the respective welt folders, means adapted to widen the space around the exterior of the cord tube comprising pairs of pivoted parallelogram linkages in the aperture, each pair being secured at one end to the inside face of one of said folder plates and at the other end to a stationary portion of the chassis, spring means engaging said folder plates biased to urge said folder plates together, and a spreader for the folder plates comprising cam faces on the ends of the folder plates remote from the welt folders, a knob, a shaft in the knob extending through the core member, and eccentric cams on the shaft in engagement with the respectiv cam faces adapted upon rotation of the knob to shift the welt folder plates endwise thereby to effect a widening of the space laterally and endwise between the welt folders and the exterior of the cord tube.

9. A sewing attachment for stitching welt seams comprising an anchor arm adapted for attachment to a table surface of a sewing machine, a support arm pivotally secured to the anchor arm, a chassis on the support arm and means for adjusting th arms to positions wherein the chassis is located in operative position relative to a sewing head of said sewing machine, said chassis having a part thereof attached to the support arm, said chassis including a cord tube extending around one end in a direction tilted downwardly toward a stitching position, a welt folder comprising a flat element spaced from the cord tube on each side thereof and extending around the cord tube forming a welt tube around the 12 cord tube, and fabric guides comprising separate fiat members located one on each side of the welt folder and spaced therefrom forming a sheet recess between the welt folder and each said flat member.

10. A sewing attachment for sewing welt seams adapted for adjustment to fabrics of different weights comprising a chassis, a supporting member adapted to mount said chassis on a sewing machine in a position adjacent a sewing head, said. chassis comprising a body, a core member in the body having substantially parallel opposite faces and having a curved cord tube at an outside edge, welt folder elements at opposite sides of the body each comprising a flatplate overlying one face of the core and having a guide portion extending around and spaced from the exterior of the cord tube, a pair of parallelogram linkages between each plate element and the core enabling simultaneous endwise' and lateral movement of the guide portion relative-to the cord tube, and an adjustor on the body having an operative engagement with the welt folder elements whereby to set said welt folder elements in a selected position of adjustment relative to the cord tube.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 33,817 Tucker Nov. 26, 1861 1,957,403 Ackerman May 1, 1934 2,096,691 Ackerman et a1. Oct. 19, 1937 2,142,277 McDonald Jan. 3, 1939

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