US1119912A

US1119912A - Overseaming sewing-machine.

Info

Publication number: US1119912A
Application number: US52215709A
Authority: US
Inventors: John P Weis
Original assignee: Individual
Current assignee: Individual
Priority date: 1909-10-11
Filing date: 1909-10-11
Publication date: 1914-12-08
Anticipated expiration: 1931-12-08

Description

J. P. WEIS. OVERSEAMING SEWING MACHINE.

AFPLIOATION TILED 00'1". 11. 1909.

Patented Dec. 8, 1914.

WITNESSES. ENTOR ATTORNEY.

THE NORRIS PEIERS CD 1 PNOI'OJ-ITNQ. WASHING TON. D. C

J. P. WEIS.

OVBBSEAMING SEWING MACHINE.

APPLICATION FILED 001'. 11, 1909.

1,1 19,912. Patented Dec.8,1914.

6 SHEETS-BHBET 2.

WITNESSES:

ur NnvDIQ IPE'TERS cu rnurO-LITHQ. WASHING ION. D. c

WITN E J. P. WBIS.

OVERSEAMING SEWING MACHINE.

APPLICATION mum 001. 11, won.

Patented Dec. 8, 1911 6 SHEETS-SHEET 3.

IN l/E N TOR ATTORNEY.

THE NORRIS PETERS CO, PHOTO-LITHOY. WASHING TON, D. c

J P WEIS ovmsmmma sawms mwamn.

APPLICATION FILED 001211, 1909.

Patented Dec.8,1914.

6 8KBET8-BHEBT 4.

WITNESSES:

O. WASMINGION. D. C

HE NORRIS PETERS 60.. PHOWLITH J. P. WEIS.

ovnasmmma SEWING MACHINE.

APPLIGATION I'ILED OCT-11, 1909 1 ,1 1 9,9 1 2.

Pafinted Dec. 8, 1914.

8 BHEETBSHBBT 5.

ATT NE THE NORRIS PETERS c0.. PHOTO-LUNG. WASHING TON. D. c.

J. P. WEIS.

OVERSEAMING SEWING MACHINE.

APPLICATION FILED 00111, 1909.

1,1 1 9,912. Patented Dec.8,1914.

6 SHEETS-SHEET 6.

ATTORNEY.

I 1 WITNESSES. R m l/VVfE/VT R. @QQWM K & i 5

HE NORRIS PETERS CO. PHOTO LITHOH WASHING 70H. D. C

UNITED STATES PATENT OFFICE JOHN P. WEIS, OF NYACK, NEW YORK.

OVERSEAMING SEWING-MACHINE.

Application filed October 11, 1909.

To all whom it may concern Be it known that I, JOHN P. \Vnrs, a citizen of the United States, residing at Nyack, county of Rockland, and State of New York, have invented a new and useful Improvement in Over-seaming Sewing-Machines, of which the following is a description.

This invention relates to sewing machines and particularly to overedge stitching machines wherein a plurality of threads are employed for the purpose of covering the edges of the work-or making an artificial 'selvage thereon.

Among the objects of my invention may be noted the following: to provide a novel form of mechanism for producing a threethread stitch on the trimmed edge of the work; to provide a novel arrangement of the stitchforming mechanism in the ma chine; to provide a novel form of cooperating stitch-forming elements for producing an over-edge stitch; and to provide certain novel and simple details of construction which tend to the improvement and perfection of the machine made the subject of my invention, and this particularly with reference to the mode in which the threads are led to the looper and spreader of the stitching mechanism.

l Vith the above objects in View and others which will be detailed during the course of this description, my invention consists in the parts, features, elements, mechanisms and combinations of elements and mechanisms as hereinafter described and claimed.

In order to explain my invention I have provided drawings wherein:

Figure 1 is a rear elevation of a machine embodying my improvements; Fig. 2 is a front elevation of said machine; Fig. 3 is a top plan view, on an enlarged scale, showing the machine in the plane of the bed-plate, with parts broken away to show details of construction; Fig. 4 is a front end elevation of the machine with the end plate removed and certain parts broken away; Fig. 5 is a perspective view of the cover-plate; Fig. 6 is a section taken substantially on the line 6-6 of Fig. 1; Fig. 7 is a View taken substantially on the line 7-7 of Fig. 1; Fig. 8 is a vertical section taken substantially on the line 88 of Fig. 3; Fig. 9 is an elevation of the thread-cutter; Fig. 10 is a top plan of the presser foot; and Fig. 11 is an enlarged Specification of Letters Patent.

Serial No. 522.157.

view, showing partially in section and partially in top plan, the details of the driving mechanism for the looper and spreader.

Referring to the drawings the numeral 1 lndicates the bed-plate of the machine, 2 the vertical arm thereof, the overhanging portion of said arm, 4 the head and 5 the bearings of said head in which the needle-bar 6 and the presser bar 7 operate. The needlebar carries at its lower end a needle 8 and the presser-bar carries at its lower end the presser-foot 9 shown in detail in Fig. 10, said presser-foot being pivoted, by its supporting plate 10, to the shank 11 carried by the presserbar 7. The presser-foot is provided with upturned toe l2 and in rear of the same with a laterally adjustable guard 13 and in rear of the latter with a laterally adjustable tongue 14. These features are not described in detail herein because they are not made the subject of claim and are described in all their details in my companion application Serial No. 522,158 filed of even date herewith. The presser-bar is normally depressed by a spring 15 which at one end rests upon a collar 16 clamped upon the presser-bar and at its other end rests upon the spindle 17 which supports the tension-device 18. An adjusting screw 19 passing through the lug 20 engages the said spring 15 between its ends and thus the pressure of said spring upon the presser-bar is regulated. The needle-bar is reciprocated by means of the needle-lever 21 fulcrumed at upon the vertical arm 2 of the frame, said lever having its front end connected by a link 23 to a collar 24 clamped upon the needle-bar. The rear end 25 of the lever 21 is connected, in usual manner, to an eccentric strap 25 covered by the guard 26 secured by the screws 27 passing through the keyhole slots shown in Fig. 2 and into the vertical. arm 2 of the frame. The said eccentric straps surrounds an eccentric 27 on the driving-shaft 28 the rear end of which carries the combined hand-wheel and pulley 29, said shaft being journaled at its rear end in the said vertical arm 2 and at its front end in a standard 30 supported at the front end of bed 1.

The numeral 31 indicates the tension for the needle-thread, the latter extending from said tension through the guide 32 carried by the lever 21, thence through the adjust- Patented Dec. 8, 1914.

able guide 33 carried by the arm 3, thence through the guide 34 carried by the lever 21 near its forward end, thence through the guide 35 secured to the upper end of the neeedle-bar 6, and thence to the needle.

The feeding mechanism which T. employ in this particular machine is of the difierential type and consists of the main feed-bar carrying at its front end the feed-dog 37 and being pivoted at its rear end at 38 to the upper end of the rocking-frame 39 journaled at its lower end in bearings 40 extending rearwardly from the bed-plate 1, said rocking-frame 39 being clamped upon the journal 4:1 operating in said bearing 40. The rocking-frame is given its movements by the strap 12 pivotally connected at one end to the upper end of the said rockingframe and surrounding at its other end the eccentric 13 carried by the driving-shaft at its outer end, said eccentric, in this instance, being carried by a crank-pin 14: adjustable in usual manner in the diametric slot 4L5 of the disk 46 secured to the outer end of said driving shaft. Just in rear of said eccentric 13 the crank-pin 44 is surrounded by one end of a pitman 4C7, the other end of which is pivotally connected at 48 to a sliding block e19 operating upon the curved lever 50 journaled at its lower end at 51 upon the bearing block 52 extending from the bedplate 1 of the machine. The upper end of lever 50 is pivotally connected to a pin 53 extending from the outer end of link 54 the other end of which is pivotally connected by a pin 53 to a sliding-block 55 operating in the overreaching head 56 extending from the forward end of the feed-bar 36. The sliding-block 55 carries the feeddog 57 the arrangement of said dog and the main feed-dog 37 being such as to leave a clear space, or make an arch in which the looper of the stitch-forming mechanism operates. The feed-dog 57 is auxiliary to the feed-dog 37 and may be given movements the same as the main feed-dog or different in extent as desired and in accordance with the adjustment of the pitman 17 with its slide block 49 along the lever 50. The adjustment is secured and maintained by the stops 58, one above and the other below the pivotal connection as and coiiperating with the latter to support the same and hold it in adjusted position. The stops 58 slide upon the vertical rod 59 and are set rigidly thereon by means of screws 60. Thus it will be seen that the crank and eccentric on the end of the driving shaft, through the me dium of their respective connections, give longitudinal movements to the two feeddogs and that the movement of said dogs can be regulated according to the length of the stitch desired, and relatively to each other by the connection of the crank-pin -14:

I with the disk 46 and the adjusting means including the adjustable stops 58. The rise and fall of the feed-dogs is imparted by means of the eccentric 62 by the straps 62 the upper end of which is pivotally con nected at 63 to the forward end of the feedbar 36, the said eccentric being carried by the driving-shaft 28, see Fig. 9. It may be noted that this differential feeding mechanism is, or may be, in all material respects substantially the same as the feeding mechanism shown, described and claimed in my application Serial Number 507,368, filed July 13, 1909. As to the trimming mechanism herein illustrated, and all the parts of which are indicated by the same reference character 6 1 as a matter of identification, no claim is made thereto in this case since it forms the subject matter of my application Serial Number 160,208, filed June 5, 1903.

The feed-bar has secured to it at its for-. ward end the thread-cutting blade 65 the shank 66 of which spans the space under the two feed-dogs 37 and 57 and is secured to the

parts

36 and 56 of the feeding mechanism by means of the screws 67, seeFigs. 4 and 9. The cutting-blade 65 cotiperates with a plate or ledger-blade 68 securedby screws 69 to the throat-plate 70 which is secured to the front portion 71 and rear portion 72 of the work-support by means of the screws 73. The throat-plate is provided with slots corresponding to the feed-dogs 37 and 57, and it will be noted that the outer serrated surface of each of the said dogs has a coperating or overlapping portion 74 the same as, and the function of which is described in, my aforesaid application Serial Number 507,368.

The work-plate is made up, in addition to the front and

rear portions

71 and 72, respectively, of a swinging portion composed of the top plate 75, the end-plate 76 and the front and rear flanges 77 the lower ends of which are j ournaled at 78 to similar bearings 79 extending from the front endof the bed-plate 1 of the machine. The topplate has the extension 80 which cooperates at the rear with the plate 72, at the front with the plate 71, and at the side with the throat plate 70. The extension 80 0f the top-plate 75 carries a catch-plate 81 having a depending spring-catch 81 the teat 82 on the side of which coiiperates with a recess in the adjacent portion 30 of the standard 30 extending from the machine bed. The vertical portion 76 of the workplate carries a thread-guide, consisting, preferably, of bent wire the ends 83 of which are suitably secured in said end portion 76, extend outwardly therefrom, and then rear wardly toform the loops 84 connected by the bar 85 extending longitudinally of said vertical portion 76. The looper-thread, in passingthrough this thread-guide, extends from a guide-eye 86 secured to the lower portion, at the rear side, of the ver tical arm 2, see Fig. 1, said thread extending a from said eye to the guide-eye 87 secured to the bed 1 of the machine adjacent to tension device 88, which latter may be of any usual character, the thread passing through this tension device and thence to the said guide-loops 8 1. Leaving said guideloops the looper-thread passes to the combination thread-guide, clamp, take-up, and pull-oil, see Figs. 4 and 8, the parts of which are only generally indicated herein since the details of construction are not made the subject of claim herein. The base-plate of the guide and clamp is indicated at 89 and -is secured to the bed 1 by the screw 90, said base-plate having the vertical post 91 extending therefrom which, at its top, has the U-shaped portion 92 from which extends the arm 93 forming part of the thread-clamp, the other part of which is formed by the spring 94 having the projection 95 extending from the side thereof and within the space between the arms of the U-shaped portion 92. The arm 93 is provided with the notch 96 terminating in an open guide-eye through which the thread extends from a pair of guide-eyes 97 carried by the opposite arms of the U-shaped portion 92, the thread thus spanning the space between the said arms so as to be operated upon by a combined take-up and pulloff disk 98 carried by the drivingshaft 28 just beside the bearing30, the said disk 98 having a cam portion 99 projecting from its inner side, see Fig. 8, which cotiperates with the projection 95 of the clamping spring 9%. A similar.

combination of elements is provided for the control of the spreader-thread, the same being illustrated in Figs. 1 and 3 wherein 100 indicates the cam disk, 101 the clamping spring, 102 the supporting arm 103 the base-plate and 10a the securing screws, which latter pass through the elongated slot 105 of said base-plate 103 into the bed plate 1, this construction being common to both devices herein shown. With particular reference to said Figs. 1 and 3, it will be seen that the operation of the thread controlling device is to engage the thread extending between the guide-eyes 106, before the cam thereof engages the projection of the clamping-spring thus operating to control the slack extending from the clamping device to the spreader; but, in the further travel of said disk, the cam carried by the latter will engage the projection of the clampingspring and force the latter against the thread extending along the arm of the thread-guide. When th1s occurs, the thread engaging disk in its continued movement will draw thread from the supply since the thread is clamped on the spreader side of the clamping-device. Precisely the same operation occurs with reference to the looper-thread so that during one portion of the rotary movement of the disk the latter will control the slack thread extending from the rear end of the looper to the clamping-device while the latter is open, and when said clamp is closed upon the thread said disk will draw thread from the supply through the tension device 88. And, the relative adjustment of the two thread controlling mechanisms is such as to bring about complete control of the spreader and looper threads at a time during the operation of the machine, such as to prevent any slack occurring when it is necessary to have the thread substantially taut and to supply thread to the looper and spreader at the proper time to prevent friction there on by the moving parts ofthe stitch-forming mechanism. This will be described presently; but, it should now be noted that all the guide-eyes, or thread guides, for the looper and spreader are open so that the thread is merely laid in said guides rather than being threaded through them. That is to say, guides 86, 106, 87, 84 and 97 are open wire loops, while

guides

102 and 96 are open eyes.

A looper-supporting plate 107 is secured to the bed-plate 1 of the machine by means of screws 108 passing through large apertures 109 in said supporting plate, said screws having their heads counti-ir-sunk in the recesses 110 forming part of apertures 109. Said plate 107 has connected to it, by one or more screws 111, a spreader support ing-plate 112, the latter being secured to said looper sup 'iorting-plate at an inclina tion as clearly shown in Figs. 3 and 7, said two plates being arranged at an acute-angle to each other. The forward end of the looper-supporting plate is provided with journals 113 in which operates a j ournal-pin 11-l upon which is secured the lower end of a looper-carrier 115 to the upper end of which is secured a looper 116 by means of a screw 117 passing through its shank and into the extension 118 of said carrier. The looper-shank at its top is formed into the rearwardly pointing looper 1.19 provided with the usual thread-eyes and connecting groove for receiving and guiding the looperthread. The looper-carrier is secured to the journal-pin 114 in any usual way, there being suilicient clearance on opposite sides of the looper-carrier between the latter and the bearings 113 to enable proper adjustment of the looper relatively to the path of reciprocation of the needle. The body of the looper-shank, above its point of connection with the looper-carrier, is provided with the beveled portion 120 constituting a needlecured the bevel-gear 132.

deflector to prevent the needle in its descent from getting behind the looper or injuring the same or breaking the needle by contacting therewith. The looper-carrier, just below the point of connection of the looper therewith, is provided with the crank-head 121 which swings upon and is held by the crank-pin 122 extending from said carrier 115, the connection being made by a screw 123 passing through said crank-head and into engagement with said pin. A pitman 124 connects the crank-head 121 with a crank-pin 125 carried by one end of a crankplate 126, which in turn is carried by a crank 127 at its other end, passing through the end of a pitman 12S and connected with the driving device or transmitter composed of the journal 129, an enlarged grooved disk 1.30, and journal 131 to which latter is se The gear 132 of the transmitter meshes with the bevel-gear 133 secured to the driving-shaft 28. The gear 132 is centered upon the hub 137 of the journal 131 and its driving connection is made by a pin 137 extending from journal 131 into an aperture 132 in gear 132. The groove of disk 130 is V-shaped and receives ball-bearings 130*. The driving device or transmitter is centered in the bracket 134 and its face-plate 134, and each is provided with opposed beveled faces forming a V- shaped groove 134 in which the ball-bear ings 130 run. The two V-shaped grooves form a track or race for holding the balls, and the face-plate 134*, being threaded into the bracket 134, can be adjusted to take up wear or adjust the pressure of its bearing surface on said balls, the adjustment being held by screws 0 and metal shoe 0. This adjustment can be made by a spanner-wrench, cooperating with the apertures a in the outer face of the face-plate 134 The bracket 134 is secured to the bed-plate 1 of the machine by means of the attaching base 135 through elongated slots in which passes one or more screws 136 into the said bed-plate, the said attaching base being provided with a lug or flange 137 cooperating with a correspondingly formed groove in bed-plate 1, this structure preventing displacement of said bracket 134 and enabling centering and accurately placing the same and thereby facilitating assembling. The pitman 128 at its front end is connected with the pivot pin 138 which passes through the rear end of the spreader-carrier 139 and is secured in the radius-bar 140 pivoted at 141 near the upper end of plate 112. The spreader-carrier is pivoted between its ends at 142 to a radius-plate 143 pivoted at 144 to the plate 112, said carrier having at its front end the crank-socket 145 in which is secured a socketpin 146 in the upper end of which is set the shank of the spreader 147. The spreader is provided at its free end with the outwardly and upwardly turned thread-lifting finger 148 and in rear of the'latter in the body thereof with a thread-groove 149 at each end of which is a thread-eye 150. The radius-plate 143 is guided or steadied in its movements by the curved race-plate 151 secured by screws 152 to the plate 112;'and the radius-bar 140 is guided or steadied at its free end in the curved race-plate 153 se cured to the plate 112 by means of screws 154. Thus the spreader mechanism is made compact, strong and durable, and in its operations is positively held from vibration and chattering. And, it will be seen that the driving means for the looper and spreader, consisting of bevel-gears and a double crank, the crank-members being at different distances from the center of the journal 129, is capable of steady, continuous, positive movements directly and positively imparting the necessary timed or differential movements to said looper and spreader through the train of mechanism, respectively, connecting the same with the double crank.

It will be understood that the looper in its confined oscillations to cooperate'with the needle has but a very short movement, while the spreader, in its gyrations has a very extensive longitudinal movement and quite an extensive vertical movement. The difference in movement, or differential, existing between the looper and spreader is due to the character of the duplex-crank driving device.

As seen in Figs. 2, 3 and 5 a cover-plate is applied to the machine to shield the looper and spreader actuating mechanism so as to prevent the work from becoming entangled therewith and to avoid oil being flirted from said mechanism upon the work or the operator. This cover-plate also carries off the trimming. The plate consists of the inclined body portion 155 from which depends the flange 156 arranged substantially at an obtuse-angle to the said body portion, but vertically relatively to the inachine to the front edge of the bed-plate of which said flange is secured, see Fig. 2, by means of screws 157 passing, respectively, through the open-end slot 158 at the front end of said plate and the open-end angular slot 159 near the rear end of said plate. Any number of slots 158159 may be employed. By this means the plate can be easily set in and taken from place by the operator. At its rear end the cover-plate is provided with the rearwardly extending flange 160 which passes just in rear of the bracket 134 and cooperates with the vertical arm 2 of the machine to completely house the actuating mechanism. -Adjacent its-rear end said cover-plate is provided with the circular protuberance 161 which corresponds in position with the double crank-mechanism and whose recess affords a clearance for said mechanism. Extending along the upper edge of said body portion is the flange 162 which extends into cohperation with the supporting-plate 112, thus preventing the access of dust or lint to said mechanism and the egress of oil from the latter. At its front end, the body portion 155 is provided with a combined shunt'guide and trough consisting of the curved overhanging shunt-portion 163 merging into the upper edge of said body portion 155 and extending substantially at an obtuse-angle thereto and to the trough, the base 164 of which latter is inclined relatively to the body portion 155 of the cover-plate and provided at its front edge with the flange 165. The arrangement and codperation of the shunt-guide with the trimming mechanism will be seen in Fig. 3, wherein it is shown that the trough stands directly under the trimmer-blades While the shunt-guide stands in front thereof, so that as the trimming is severed from the body material or work it will be carried by the feeding mechanism into contact with said shuntuide which will throw it back or shunt 1t into the trough from which it will slide down the inclined body portion 155 of the cover-plate and from thence will slide to the front of the machine out of the way. Viewing Fig. 3 it will also be seen that the front portion 71 of the work-plate is not very extensive though it, on the right hand side, extends along the edge of the throat-plate to a position over the trough 164 and nearly to the point of co5peration of the trimmer-blades. In this figure and in Fig. 2 it will also be seen that the overhanging portion of the shunt-guide 163 is sufliciently extensive to stand over the trough 164 and the trimming mechanism adjacent the sides of the trimmer-blades. In Fig. 3 the rear portion 72 of the work-plate is shown to have a side flange 72 which extends toward the rear of the machine and is curved around into coperation with the side of the throat-plate, thus preventing the work as it travels across the work-plate from passing to the right down upon the driving shaft and other parts supported by the bed of the machine. As is usual in over-seaming machines the throat-plate is provided with a needle aperture 70 open at its side, thus providing a tongue for the usual purpose.

From the foregoing detailed description, the following brief statement of the mode of operation will be readily understood: Assuming the needle-thread to pass from its supply through the tension 31 and

several guides

32, 33, 34 and 35 intothe eye of the needle, and the spreader-thread to pass from the supply through the tension 18 and the

several guides

86 and 106, to the spreader, and the looper-thread to pass from its supply through the

guides

86 and 87, guide-loops 8'1, and guide-eye 97, clamping-- device 93-9 l, and guide-eye 96 to the looper, it will be understood that when the machine is in operation the needle will be vertically reciprocated by the needle-lever 21 and its connections, and the looper will be given an oscillatory movement and the spreader a gyratory movement through the medium of their train of connecting mechanism to the double-crank and bevel-gears.

The parts are so timed that as the needle ascends, after passing through the work, it will throw out a loop which will be engaged by the looper in its loop-taking movement and which will slide along the body of said looper to its crotch 119 and be held by said looper during the major portion of its reverse movement. As the looper reaches substantially its extreme forward position, the spreader will move into coiiperative relation therewith and shortly thereafter the looperthread will be slightly bowed along the looper body owing to the rearward movement of said looper. The spreader then lifts said looper-thread upwardly and across the edge of the work and passes into said loop as the spreader finger passes forward to the front of the path of reciprocation of the needle. During these movements of the looper and spreader, the needle, will have risen from the work and partially descended again, and during this movement of the needle the spreader will begin to recede thus bowing its loop from its body so that the needle, just before again entering the work, will pass into the loop of the spreader-thread. The looper in the meantime will have moved toward the left end of the machine, or rearwardly, thus allowing the needle-thread loop to slip from its end but inclosing the looper-thread. Thus, it will be seen that the needle-loop is held by the looper-thread and that the loop of the looper-thread is held by the spreaderthread, and that the loop of the spreaderthread is held by the needle thread. Also that the looper-thread extends from the bottom surface of the work across its edge to and over its top surface, if desired, and that the spreader-thread extends from the edge of the top surface of the work across said top surface. It will also be understood that the needlc-thread will show in a line of straight stitches on both surfaces of the work, and that the precise concatenation of the several threads will depend entirely upon the tension applied to the same by the several tension devices. During the formation of the overscaming stitch, as described,

' the thread controlling devices for the two nism lower threads will perform their functions upon the looper and spreader-threads alternately; that is to say, the spreader'thre'ad will be drawn from its supply while the looper-thread is having its slack taken up, and the slack of the spreader-thread will be taken up while the looper-thread is being drawn from its supply. Thus it will be seen that when the supply of spreaderthread is running free to the spreader the looper-thread will be held under tension, and that on the other hand when the supply of looper-thread is running free to the looper the spreader-thread will be held under tension. Likewise, in consequence, the drawing of supply-thread for the looper and spreader will occur alternately.

It is now important to lay stress on certain features of my stitclrforming mechaand the combinative arrangement thereof with the trimmer and feed where by the functions of the machine are produced; that is to say, the arrangement and cooperative action of the two thread con:

trollers on the looper and spreader threads, and the manner in which said threads are controlled are quite important since their structure is such and the arrangement is such that the slack is controlled and the tension is applied at the exact moment required for the proper formation of the stitch, and this exact moment can be regulated to a nicety by reason of the adjustment of the combined thread-guide and clamping device with reference to their cam and controller disks. The double crank operated by the bevel-gear and the structural features thereof are very important since continuous rotary motion imparted to them as prime-movers, their action is easy, noiseless and steady and because of the fact that the double crank imparts to the looper and spreader through the respective pitmen a differential movement; that is to say, the looper has but a short movement oscillatory in character, While the spreader has a gyratory motion all the movements of which are quite extensive. This enables the necessary movements of the spreader over the edge of the work to be given quickly and positively in substantially the same time as the short movements of the looper are given below the work- The structure by which the active lower thread-carrying devices are supported and which brings said devices into the proper cooperative relation to each other and com.- pels them to pursue the proper paths for the purpose is also important in my invention, since in assembling the two said devices can be certainly and always accurately positioned relatively by reason of the structure of the plates supporting the same and also by reason of the fact that the two plates together with .the said devices can be adjusted as a whole universally in a horizontal plane on the bed-plate of the machine so as to bring their active ends into proper cooperative relation with the needle. Then too by reason of the inclination of the plate supporting the spreader which is always fixed and predetermined, guess-work as to the proper active position and inclination of the said spreader is completely eliminated.

Another important feature of my stitchforming mechanism resides in the facility with which the lower active elements can be threaded; that is to say, all the guide-eyes and loops are open sothat the thread can be quickly laid in the said guides in contradistinction to being threaded into or through the said guides. This makes the matter of threading up the machine very simple and eliminates tantalizing delays.

Another important feature of my invention resides in the fact that all the moving driving parts of both the looper and spreader are completely covered and housed by a novel form of cover-plate which prevents the work being soiled by contact with said parts and prevents oil being flirted from the latter upon the work. Dust and grit and lint are also prevented from reaching the moving parts so that their proper action is not interfered with and perfect lubrication is easily maintained.

' Having thus described my invention what I claim and desire to secure by Letters Patent is:

l. A stitch-forming mechanism for sewing machines comprising a vertically reciprocating needle, a thread-carrying looper, a thread-carrying spreader, a plate having a rocking frame journaled thereon for supporting the looper, a plate having means thereon for supporting the spreader, the spreader-plate being secured to the looper-' plate at an angle thereto, means whereby said plates may be adjusted so as to properly position the looperand spreader relatively to the needle, and means for actuating. the several stitch-forming elements.

2. A stitch-forming mechanism for sewing machines comprising a needle, a looper and a spreader supported in cooperative relation, the looper and spreader being normally below the worleplate; an anti-frictional transmitter; a double crank connected to said transmitter; a driving connection from one portion of the crank to. the looper; and a driving connection from the other portion of the crank to the spreader.

3. A stitch-forming mechanism for sewrotary, anti-frictional transmitter connected to said shaft; a double crank mechanism connected to said transmitter; and independent pitmen connecting the double crank mechanism respectively with the looper and spreader for actuating the same in timed relation to the needle.

4. A stitclrforming mechanism for sewing machines comprising a needle, a looper and a spreader; supporting plates for the looper and spreader connected together at an angle to each other so as to support the looper and spreader in angular. relation; and a differential transmitter including a rotary member having two cranks at different distances from its center for actuatingthe looper and spreader, whereby the latter will be given movements of different extent and in timed relation to the needle.

A stitch-forming mechanism for sewing machines comprising a needle, a looper and a spreader; means for actuating the looper and spreader comprising a rotary disk, anti-frictional bearing therefor, and a double-crank carried by the disk; and connections from said double-crank to said looper and spreader.

(S. A stitch forming mechanism for sewing machines comprising a needle, a looper and a spreader; and means for actuating said looper and spreader comprising a driving-shaft, an anti-friction device, a bevelgear connection between said device, and connections from said double-crank to the looper and spreader.

7. A stitch-forming mechanism for sewing machines comprising a needle, a looper and a spreader; and means for actuating said looper and spreader including a grooved disk, ball-bearings for said disk, a bracket in which said disk is journaled, driving gear for actuating said disk and means connecting said disk with the looper and spreader.

8. A stitch-forming mechanism for sewing machines comprising a needle, a looper and a spreader; means for actuatingthe looper and spreader comprising a rotary disk, a bracket in which said disk is journaled, ball-bearings in said bracket for said disk; means for adjusting a portion of said bracket to compensate for wear; and connections from said disk to said looper and spreader.

9. A stitch-forming mechanism for sewing machines comprising a needle, a looper and a spreader supported below the workplate of the machine; independent supports for the looper and spreader; means for actuating the looper and spreader including a drivingshaft, a transmitter connected to said shaft and comprising a rotary, double crank device; and connecting means between said device and said looper and spreader, whereby the rotary movementof said device is transformed into differential movement in the looper. and spreader. u.

10. A stitch-forming mechanism for sew ing machines comprising a needle, a looper and its carrier, and a spreader and its carrier; means for actuating the looper; and means for actuating thespreader comprisinga transmitter, a radius-bar, and a con mon connection between the transmitter, the radius-bar and the spreader-carrier.

11. A stitch-forming mechanism for sewing machines comprising a needle, a looper and its carrier, and a spreader and its carrier; means for actuating the looper; and means for actuating the spreader including a transmitter, a radius-bar, a radius-plate, a connection between the transmitter, the radius-bar and the spreader-carrier common to all of them, and a connection between the spreader and the radius-plate, whereby motion is imparted to the spreader in a curved path.

12. A. stitch-forming mechanism for sewing machines comprising a needle, a looper and a spreader; and means for actuating the looper and spreader including a rotary transmitter having a pair of cranks, a looper-carrier rigidly supporting the looper, a connection journaled upon the carrier, a pitman directly joined to said connection and one crank of the transmitter, and a connection from the spreader to the other crank of the transmitter.

13. A stitch-forming mechanism for sewing machines comprisinga needle, a looper and a spreader; means for actuating, the spreader; a looper-carrier to one extreme end of which the looper is connected; a journal-support for the carrier; a rotary transmitter; a connection journaled to said carrier between its ends; and a pitman directly joining the transmitter and said connection, whereby a differential movement is imparted to the looper.

141. A stitch-forming mechanism for sewing machines comprising a needle, a looper, a spreader, and a transmitter; independent plates for supporting, respectively, the looper, spreader and transmitter; a bevelgear cooperating with one of the supporting-plates for aiding in housing the transmitter; and means whereby certain of said supporting-plates may be adjusted relatively so as to secure the proper cooperative relation between the transmitter and looper and spreader.

15. A stitch-forming mechanism for sewing machines comprising a needle, a threadearrying looper and a thread-carrying spreader; means for actuating the several elements; thread-controlling devices for the looper and spreader threads; and means for actuating said devices so as to cause the looper-thread to be drawn from its supply signed my name in the presence of two sub- When the slack of the spreader-thread is scribing Witnesses.- being taken up and cause the spreaderthread to be drawn from its supply When H 5 the slack of the looper-thread is being Witnesses:

taken up. HUGO KUNTZLER,

In testimony whereof I have hereunto JOHN W. KANE.

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Washington, G." l