US1692094A - Attachment for sewing machines - Google Patents

Description

Nov. 20, 1928.

- A. SAWERS ATTACHMENT FOR SEWING MACHINES '7 Sheets-Sheet 1 Filed Dec. 24, 1925 Nov. 20, 1928. I 1,692,094

I A. SAWERS ATTACHMENT FOR SEWING MACHINES Filed Dec. 24, 1925 7 Sheets-Sheet 2 Nov. 20, 1928.

A. SAWERS ATTACHMENT FOR SEWING MACHINES Filed Dec. 24, 1925 Sheets-Sheet 5 Nov. 20, 1928.

A. SAWERS ATTACHMENT FOR SEWING MACHINES Filed Dec. 24,1925 7 Sheets-Sheet 4 WWW Nov. 20, 1928.

' A. SAWERS ATTACHMENT FOR SEWING MACHINES '7 Sheets-Sheet 5 Filed Dec. 24, 1925 @m VMM Nov. 20, 1928.

A. SAWERS ATTACHMENT FOR SEWING MACHINES Filed Dec, 24, 1925 7 Sheets-Sheet 6 Nov. 20, 1928 A. SAWERS ATTACHMENT FOR sswme MACHINES 24, 1925 '7 Sheets-Sheet 7 v Filed Dec.

:IIIIiLZTiI Patented Nov. 20, 1928.

UNITED STATES ANDREW SAWERS, F LEEDS, ENGLAND.

ATTACHMENT FOR SEWING MACHTNES.

Application filed December 24, 1925, Serial No. 77,571, and in Great Britain March 24, 1925.

This invention relates to a new or improved attachment which is capable of being readily applied to an ordinary chain, or to a lock stitch sewing machine. The said attachment is fitted to an ordinary chain stitchmachine for converting it into a basting and edge rubbing machine. W hen an ordinary lock stitch machine is provided withthe said attachment, it may be used for edge rubbing and stitching as and when desired, and in this case, the basting operation, which is usually accomplished on a chain stitch machine, can be dispensed with.

Hitherto it has been customary to haste the edges of a garment on a chain stitch sewing machine, or by hand, or partly by each method and then to pass the garment on to a lock stitch machine for the permanent edge stitching operation to be performed. In the said machines it has only been possible to perform the basting operation at a limited distance from the edge of the garment being sewn.

The machines at present in use are capable of 0111 edge rubbing and basting straight or slight y curved edges, and they are unable to round a V or other shaped recess in the collar or lapel of a garment. The distance at which they can haste from the edge of a garment is very limited. I

The object of this invention is to provide an attachment which may be readily and easily combined with an ordinary chain stitch or lock stitch machine, and which will be more efiicient than those hitherto in use.

lVhen the said attachment is combined with a chain stitch machine not only may the operations of edge rubbing and basting be performed, but suitable means are provided whereby parts of the attachment are moved out of the way to permit of the said V or other shaped recesses being basted or any other basting being sewn at any distance from the edge of the garment. attachment is combined with a lock stitch machine, then it provides ameans for rubbing and stitching the edges and V or other shaped recesses of the garment without having been previously basted,.and without removing the garment to a separate machine, thus doing away with the edge basting operation altogether.

Suitable means are provided when relVhen the and when the action of the rubbing bars is dispensed with.

The above named objects are attained by mechanism illustrated in the accompanying drawings, in which Fig. 1 is an isometric view of the attachment;

Fig. 2 a front elevation of the attachment with its various parts in their working positions;

Fig. 3 a plan of the same; 7

Fig. 4 a front elevation of the attachment with the upper rubbing bar in its raised position;

F ig. 5 aplan of the attachment showing the upper rubbing bar turned at or about a right angle to the lower rubbing bar;

Fig. 6 a back elevation of the attachment showing the various parts in their workingpositions;

Fig. 7 an elevation of the right hand end of the attachment;'

Fig. 8 an elevation of the same;

Fig, 9 a front elevation of a sewing ma chine of ordinary construction with the attachment applied thereto;

Fig. 10 an elevation of the right hand end of same; i

Figs. 11 and 12 are respectively a front and a side elevation of the eccentric employed for imparting motion to the rubbing bars.

Fig. 13 afront elevation of thelever which raises the upper edge rubbing bar;

Fig. 14 an end elevation "of the same; Fig. 15 aplan of the lever shown at Fig.

theleft hand end of Fig. 16 a front elevation of the cam piece adapted to fit on the lever shown in Fig. 18;

Fig. 17 an end elevation of the same; Figs. 18 and 19 are respectively an elevation and a plan of an upper rubbing bar modified so that it is turned out ofits work ing position by pulling it forward instead of turning it towards the rear of the at tachment; f p Fig. 20 a back elevation of the attachment provided with modified'means'for reciproeating the rubbing bars from the needle bar;

plate 1 are also formed or fixed a pair of longitudinal guides i4 and'5 for purposes to be presently described.

In the bearings formed at the'upper endof the projections 2, 2 is mounted transversely a spindle '6 at a suitable distance from the upper surface of the base plate '1. On one end of the spindle 6 is mounted a pendant lever 7 to which is attached, by any convenient means, a connecting rod 8 provided with a strap 9 formed in two portions and adapted to embrace an eccentric 10, (Figs. 11 and 12) fixed upon the. driving spindle 11 carried in bearings 3, 13*. The eccentric 10'is provided with a suitable disc 12 in which are a number of grub screws 13, 13 for securing it, in position on the driving spindle 11. In some cases it may be found advisable to employ a boss formed on the end of the eccentric in place of the said disc, and when this is done the eccentric will require to be provided with a flange. The eccentric strap 9 isretained in position on the eccentric 10 by a plate 14 which is arranged to be fitted upon a reduced portion 15 of the eccentric, and the plate is retained in position by one or more set screws 16.

'On the driving spindle 11 is fixed apulley 17 for imparting a rotarfymotion to the said spindle. Motion maybe transmitted to the pulley 17 by any convenient means, as for example,,from a pulley 18, (Figs. 9 and 10) fixed upon the upper horizontal'shaft 19,-

which imparts motion to the needle bar 20 and is mounted in the upper portion of the arm 21 of an ordinary sewing machine,-- through an endless belt 22 which isarranged topass over a pair ofguides orjockeypulleys23,'24 fixed upon a spindle 25 and carried by a bearing 26 formed on a projection 27 fixed by set screws 28, 28 to the base 29 of the sewing machine. Motion is imparted from any convenient source to the spindle l9 'by means of pulley 3,0 which is formed on, or fixedto, the fly wheel 31 of the sewing machine. Or, motion may be transmitted from the bottom shaft "32- ofthe sewing machine,-that is, the one that operates the feed mechanism,.to a cam.33 fixed thereon, and from thence to an oscillating pendant arm 34 mountedon the transverse spindle'b.

'Onthe transverse sp'indle'fi'is mounted a double ended lever 35, the upper and lower ends of which are respectively connected to the upper and lower reciprocating edge rubbing bars marked respectively 36 and 37. The said rubbing bars are serrated transversely respectively on their lower and upper surfaces. 38,39, and they are constructed as follows The upper edge rubbing bar 36 is made horizontal for a portion of its length and is then curved in an upward direction at 40, when it is turned horizontally at a right angle 41 and about parallel with the base 1. On the upper surface of the horizontal portion 41 is formed a boss 42, and at-lthe top of the said boss,which is of suitable furcated portion 43 which forms a guide. The upper edge rubbing bar is loosely mounted by means of its boss 42 upon a pendant pin 44 carriedby the enlarged end '45 of the lever or link 46 which is connected to the upper end of the double ended lever 35 by a screw 47 The lower edge rubbing bar 37 is arranged to be connected to the lever 35 by a second connecting .leveror link 48 and a screw 49. Thelever or link 48 is made narrower than the width ofthe lower edge rubbing bar 37 and it is arranged to work between the longitudinal guides 4 and 5. When the two edge rubbing bars arein their closed and working position they are arranged to be about parallel,or nearly so,with each other and with the base *1 .of the attachment.

The upper edge rubbing bar 36 is mounted upon its pendant pin '44 in such a manner as will permit it to be moved out of its-working position as will be presently described.

The said rubbing bar 36 is retained in its working position by means of a flat or other spring 50, the rear end of which is fixed by a set screw 51 to thehorizontalportion of the angle piece 52 the vertical portion of which angle piece is securedby any convenient means to the vertical bifurcated part 53 which is part of the vertical lug 3 cast or otherwise formed onor fixed to the base 1. Two pins 55 are also provided on the upper surface of the horizontal portion ofthe angle piece 52 for retainingvthe spring 50 in a working position. I necting lever or link 46 is arranged to work in the bifurcation ofthe vertical portion 53 which acts-as a guide for the said lever both in its'reciprocating and rising and falling is connected to a boss 58 from the end-of which-projectsan arm '59 in which is fixed apin 60 upon which is'mounted arunner or bowl 61. The lever 57,';boss'58 arm 59 "are preferably formed in 'onepiece and 'length,-is formed a second horizontal bi- The upper-com r the manner shown at Figs. 13 to 15. The boss 58 and portions of the lever 56 and arm 59 are mounted loosely upon the driving spindle 11. The arm 59 may be arranged at any suitable angle, say, for example only, of about one hundred and fifty degrees to the lever 57. The .bowl 61 is adapted to engage with a cam path 62 formed on, or

fixed to, the upper surface of a sliding bar 63 to which the edge guide 64 is secured by means of a set screw 65. The edges of the sliding bar 63 are inclined outwards and are arranged to work in suitable longitudinal guides formed on, or fixed to, the base 1 of the machine.

Tothe rear 89 ofthe lever 57 is fixed the arm 90 of a cam piece 91. The cam piece 91 is arranged to be at or about a right angle to its arm and its upper surface 92 is arranged to engage with the under surface of the lever or link 46. The arm 90 is provided with a slot hole 93 through which is arranged to pass a set screw 94, Fig. 1. The end of theset screw 94 is arranged to pass into the hole 95 (Fig. 13) provided with a screw thread.

The outer end,that is, the end nearest the needle,of the edge guide 64 is arranged tobe adjustable by forming theportion which actually comesinto contact with the work as a separate piece having the form of the letter L. The long arm of this L-shaped piece is provided with a slot 66 and secured to the upper surface of the guide. The shorter arm 67 of the L-shaped piece is arranged to be pendant and when desired may be of a greater width than the longer arm.

If desired the slide for the edge guide may take any other form in cross section, as for instance, instead of being dovetailed it may have its sides perpendicular to its base. In the latter case the longitudinal edges of the edge guide would be vertical instead of being inclined and the guide would be retained in the slide by a plate secured to the upper surface of the slide.

On a pin 68,-Figs. 6 and 8,at the rear, and on the upper surface of the base 1 of the attachment, and parallel therewith, is pivoted an operating lever 69 which extends from the rear to, and slightly beyond, the front edge of the base. The said lever passes over the sliding bar 63 and below the -por tion 41 of the upper rubbing bar 36, and to its outer and front end is fixed a knob 70 by means of which it is operated. The movement of the operating lever is limited by two recesses 71 and '72 (Fig. 1 formed at a suitable distance apart in the upper surface of the base 1 of the attachment, and which taper towards the centre. A pin 73 having a curved or tapered lower end 74 is arranged to engage with these recesses, and it is carried in-a sleeve or socket 75 attached to the under surface of-the last named lever and near to the front end thereof. ,76 is secured to the upper surface of the A flat spring operating lever 69 by the knob 70, and the free end of the spring is bifurcated at 77 so as to form a pair of arms which fit'into a recess 7 8 (Fig. 8) formed in the upper end of the pin 73, whereby the pin is continually pressed downwards and forms an effioient stop for controlling the movement of the said lever. If desired, however, an additional vertical pin 7 9 may be employed.

At or near the centre of the operating leveris fixed a vertical pin which projects above and below the upper and lower surfaces of the lever. The portion 80 (Figs. 6 and 8) of the pin below the lever works in a cam path 81 formed transversely in, or fixed trans versely to, the sliding bar 63.

' The upper end 82 (Figs. 1, 3 to 6 and 8) of the vertical pin works in a cam path formed in a plate 83 fixed to,or in a projection formed on,the portion 41 of the pivotably mounted upper edge rubbing bar 36. The last named cam path is approximately L shaped and has two portions 84 and 85 at or about a right angle to each other and it is employed for swingingor turning the upper edge rubbing bar 36 out of the way, for purposes to be presently described,-and is so constructed that the operating lever 69 is moved for a certain'distance,-say into the position shown at Fig. 4,-before moving the said rubbing bar, On moving the operating lever 69 from its initial position 86 (Fig. 5), the edge guide 64 andits sliding bar 63 are moved inwards by the action of the lower end 80 of the pin fixed to the operating lever and the upper edge rubbing bar 36 is slightly lifted,by the inwvard movement of the edge guide, and the action of the cam piece 62. Simultaneously the upper portion 56 of the lever 57 is low cred, and thus by these two movements the portion 56 is clear of the lever 43and the upper rubbing bar is free to turn upon its pivot, upon the continued movement of the operating lever 69 to the final position 87 shown in Fig. 5. i

The vertical arm of the angle bracket- 52 is attached to the upper end of the herein-' before named portion 53 and both the vertical arm of the bracket and the portion 53 are bifurcated so as to form a guide in which works the rod 46 connecting the upper edge rubbing bar 36 to the double ended lever 35. The said bifurcation provides for the free reciprocating and up and down motion of the connecting rod 46 and thehorizontal portion of the said angle piece is arranged above the said rod. .If desired, a spiralspring may be'attached to the base of the attachment and to the connecting rod in place'of the flat spring 50, or any other convenient arrangement may be employed.

By pivoting the operating lever .69 as described and providing it with the pin which projects both above and below the upper and lower surfaces of the said lever, the pin forms a connection with the sliding bar 63 and also with the cam plate 83 which is attached to the upper rubbing bar 36.

On moving the operating lever 69 the upper portion 82 of the pin travels in the recessed portion 85 of the cam plate 83. Simultaneously with this movement, by the lower end of the said pin working in the groove 81, the sliding bar 63 is caused to move towards the spindle 6. By the'movement of the sliding bar 63 the cam piece 62 is brought into cont-act with the bowl or runner 61 thereby moving the lever 57 in the direction of arrow 88, (Fig. 13). At the same time the cam piece 91 is raised and its upper surface 92 acts upon the lower surface of the link 46 which is correspondingly raised. Simultaneously the portion 56 is lowered until it is clear of the bifurcation 96 in the horizontal portion 43 at the rear of the upper edge rubbing bar 36.

The swinging or turning movement of the upper edge rubbing bar 36 is accomplished by moving the operating lever 69 which causes the upper portion 82 of the pin attached thereto, to travel in the portion of the cam path in the plate 83, in a direction away from the needle,until it bears against the end thereof. On the continued movement of the operating lever 69 the portion 82 of the pin bears against the side 65 of the portion 85 of the cam path and causes the upper edge rubbing bar 36 to be moved into a position at about a right angle to the lower edge rubbing bar 37 as shown at Fig. 5. When this stage of the operation is complete, further movement of the operating lever 69 causes the portion 82 of the pin to travel freely in the portion 84. of the cam path in the plate 83.

The attachment is fixed to the base 29 in a position so that the edge rubbing bars 36, 37 are in front of the needle 97. The work having been placed between the edge rubbing bars the operating lever 69 is returned to its initial position 86 for bringing the various parts of the attachment into their working positions and motion is imparted to the driving spindle 11 of the attachment from any of the above named parts, and the eccentric 10 oscillates the pendant lever 7 on the transverse spindle 6, thereby oscillating the double ended lever 35 fixed thereon. By this means the necessary reciprocating motion is imparted to the edge rubbing bars 36, 37, whereby the edges of the garment or other work are rubbed out before coming under the needle.

In order that the upper edge rubbing bar 36 shall not move past its correct working position when being returned by the 0perating lever 69, a projection 106 (Figs. 3, 6'

and 7) formed on the horizontal bifurcated portion 43 fixed to the boss 420i? the upper edge rubbing bar 36. When the said upper rubbing bar has reached-its correct working position it is prevented from moving further by the projection 106 engaging with a stop 107 fixed to the enlarged end as of the connecting rod 46 by a set screw 108, Figs. 6 and'8.

In some instances it may be found more convenient to make the upper edge rubbing bar 36 swing forwards as shownat-Fig. 19 instead of backwards as previously described. In this case the cam plate 83 and the upper portion 82 of the pin fixed to the operating lever 69 are dispensed with, and the upper rubbing bar 'is pulledforwards.

The movement of the upper rubbing bar is, in this case, limited by a pendant projection 109 (Figs. 18 and 19), formed on the 1 under surface of the horizontal portion 43, which projection engages the upper portion 56 of the lever 57 and the portion 56 looks and unlocks the upper rubbing bar exactly as previously described. i

If the attachment is on a lock stitch machine, then the edge maybe sewn at once, thus saving the labour of first basting the garment, then conveying it to an ordinary sewing machine for the purpose of edge" guide 64 is simultaneously moved out of the way by the same operation. Thus-a garment can be easily turned for the stitching of the corners. After this is done the upper edge rubbing bar 36 and the edge guide 6% may be brought into their initial positions by moving the operating lever in the reverse direction, and the operation of edge rubbingand edge stitching may be continued.

If the attachment is applied to a chain stitch machine, then the operations of rubbing and basting may be completed on=the one machine. hen desired theedge stitching may be done on the samemachine and the operation of basting omittechbut it is preferred to employ a lock stitch machine for SGWHW )ur )OSGS. l3 turnin the manor edge rubbing bar 36 out the way and movmg the sliding edge gu1de'64: to one side by the one movement of the operating lever 69 it is easily'possible to baiste round the .corners of the lapel or other portions of a garment without removingit from the machine. I r

The movable upper rubbingbar andsliding edge guide constitute a great advantage over machines previously employed, where it was impossible to sew round corners,- as just described,and was therefore necessary to perform the edge rubbing and basting on one machine, and the edge stitching on a second machine, whilst'the basting of the angular portions of the garment ha d frequently to be done by hand. Furthermore, the distance at which basting could be done from the edge of the garment by edge rubbing and basting machines previously employed was'limited, but with the present invention basting, or stitching, may be performed at any distance from the edge of the garment, the distance only being limited by the length of the arm of the sewing machine to which the invention is applied.

In cases where the attachment is to be used entirely for edge basting, then it may be modified by the upper edge rubbing bar 36 being made inxone piece instead of having its operating end pivoted. When this arrangement is employed the cam plate 83 on the upper edge rubbing bar 36 is dispensedwith and the operating lever 69 is preferably arranged at the end of the attachment further from the needle and it is pivoted at the front of the'attachment. In the rear end of the operating lever 69, which in this case is not so long as previously described,is formed a slot which engages a pin on the inner end of the sliding bar 68, and on the upper surface of the said lever is formed a cam piece which replaces the one formed on the sliding bar. cam piece engages a turned down end on the rear 89 of the lever 57, the boss of which is loosely mounted on the driving spindle 11 of the attachment. 7 The lever 57 is other wise the same as previously described.

The action of this modified arrangement is similar to that previously described. On the operating lever being moved to one side, the sliding edge guide is drawn inwards and the turned down end of the lever 57 is raised and by the action of the adjustable cam piece 91 the upper edge rubbing bar is lifted from the work.

Although the modified arrangement has been described it is preferred to employ the attachment with the swinging arm for both edge rubbing and basting, and edge rubbing and stitching. I I

In some cases the edge rubbing bars may be made adjustable as regards their length, that is, the links 46 and 48 may be made in two parts, one of which is provided with a slot and is adjustably secured to the other parts by set screws.

When it is inconvenient to impart motion to the driving shaft of the attachment from the upper or lower shaft of the sewing machine, then, by the following slight modifica- 'tion being made to the attachment it may The said receive its motion from the needle bar. The eccentrlc 10 eccentric strap 9 and connecting rod 8 are vdispensed with and the driving shaft 11 is replaced by a spindle 98 (Fig.-

103 carried b the needle bar 20. The short arm of t e said bell crank lever is connected by a link 104 to the pendant lever 7 on the transverse spindle 6, whereby motion is transmitted from the reciprocating needle bar 20 to the said pendant lever for oscillating the said spindle and the double ended lever 35 mounted thereon.

If desired on the upper end of the projection carrying the just named spindle 98 may be fixed a second pin upon which the said bell crank lever may be mounted instead of being-on the spindle 98, upon whicl may be placed the lever 57 alone.

What I claim is 1. In a sewing machine for basting and edgerubbing, an attachment comprising a base'having a pair of transverse parallel spindles carried in bearings, one of said spindles constituting the driving spindle and the other a rock shaft, a double ended lever fixed on the rock shaft, a pendant lever fixed on the rock shaft, an eccentric fixed uponthe driving spindle, an eccentric strap connected to the pendant lever for imparting motion to the rock shaft, a pair of vertically spaced links each jointed at one .of its ends to the double ended lever, a spring exerting pressure on one of said links, guides for the links, and a pair of serrated edge rubbing bars'adapted to reciprocate in opposite directions, the lower rubbing bar be ing fixed to the bottom link, and the upper rubbing bar being pivoted to the upper link, as set forth. 1

2. In an attachment for sewing machines, the combination ofa horizontal base, a driv ing shaft mounted transversely in bearings above the base, a rock shaft similarly mounted on the base, a pulley fixed upon the driving shaft, an eccentric fixed to the driv- 7 ing shaft, a double ended lever fixed upon the rock shaft, a pendant lever on the rock,

shaft, said eccentric and pendant lever being coupled together by a strap and a connecting rod, a pair of horizontal vertically sepa rated links working in guides, and connected, respectively, to one of the ends of the double ended lever, a pair of serrated reciprocating edge rubbing bars, arranged above each other, one rubbing bar being fixed to the lower link and the other rubbing bar being pivoted to the upper link, a boss on the last said link a spring for pressing the upper link, and pivoted bar on to thework, a bi-v furcated horizontal projection arranged at the upper end on the boss. of the pivoted edge. rubbing bar, .a double ended lever loosely mounted upon the driving spindle, one end of said lever being arranged to pass into the said bifurcation of the horizontal projection, for locking the upper edge rubbing bar in its working position, andmeans for operating the last named double ended lever, as set forth. 3. In an attachment for sewing machines, the means for locking. in its working position, releasing, and raising an upper edge rubbing bar, comprising, in combination, a base plate having bearings and guides thereon, a rock shaft 6, means for imparting motion to the rock shaft, a driving spindle parallel with the said shaft, a

doubleended lever fixed on the rock shaft, an upperand a lowerilink reciprocating in guides each attached at one end to the double ended lever, a spring for controlling the movement of the upper link, a pair ofserrated oppositely reciprocating bars, arranged.

one above the other, one of saidbars being attached to the upper and spring controlled link, and the otherrubbing bar being fixed to the lower link,,a boss; on the upper rub bing bar having ahorizontalabifurcated projectlon, a double ended lever-loosely, mounted upon. the driving sprindle, onearmof the said leverwbeing arranged to enterv the bifurcation of the. said projection for locking purposes, an adjustable cam piece fixed to the.

other. arm of the said lever for raising the upper link, a pendant lever fixed to the sec ond double ended lever, a bowl mounted upon the pendant lever, a cam piece on one end of areciprocating bar working in guides on the base, a transverse block at the opposite end of the said bar having a. groove: formed therein, and an operating lever pivoted upon the base and provided with a pendant pin adapted to work in the groove of the said 100? for operating the bar and its cam as set ort Y 4. In an attachment for sewing machines, the combmation with a base, upper and lower edge rubbing bars and a pair of links connected, respectively, with each said bar, of means for moving the upper edge rubbing bar out of its reciprocating position, comprising, in combination an operating lever pivoted to the said base, a plate fixed horizontally to the said rubbing bar and having a cam, slot formed therein, a pinlfixed in the oerating lever with its, ends projecting above' and below'its surfaces, the upper end of the,

pin engaging with the said, cam, slot, and a reciprocable bar having a groove receiving thelower end of said pinasset forth.

5. In an attachment for sewing machines,

the combination of a horizontal base, a driving spindle mounted transversely inb e'arings above the base, a rock shaftmounted, on the base, a double ended lever fixed on the rock shaft, means for imparting motion to; the

said rock shaft, a pair of vertically separated links pivotallyconnected respectively to the ends of the double endedlever, a spring exerting pressure on one of the said links, a pair of superposed serrated. oppos tely mounted on the base, a, double ended lever fixed upon the rock shaft, a pair of vertically separated links attached respectively tothe ends of said double ended lever, a, pair, of superposed serrated oppositely reciprocating edge rubbing bars, one of which is fixedto;

the lower link and the other of whichis pivotally mounted upon the upper link, a

spring bearing upon the upper link, means for locking, releasing, ra sing and moving the upper rubbing bar into and away from its working position, and means adapted to,

be actuated byjthe sewing machine for actuating the shafts, as set forth.

7 .In an attachment for sewing machines of the character described, the combination of a pair of superposed edge rubbing bars, having oppositely opposed serrated surfaces,

means for reciprocating said bars adaptedto be operated by a moving part of the sew ng machine, one of said bars comprising two pivotally connected sections, and a lever extending transversely of said edge rubbing bars and adapted to adjust the serrated portion of the upper barv to a position substantially at right angles to the length of said bar; 1

, ANDREW SAWERS;

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