US2225370A

US2225370A - Automatic sewing machine

Info

Publication number: US2225370A
Application number: US156379A
Authority: US
Inventors: Day Daniel
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-07-29
Filing date: 1937-07-29
Publication date: 1940-12-17
Anticipated expiration: 1957-12-17

Description

Dec. 17, 1940.

D. DAY

AUTOMATIC SEWING MACH INE Filed July 29, 1937 5 Sheets-Sheet 1 Dec. 17, 1940. D. DAY

AUTOMATIC SEWING MACHINE 5 Sheets-Sheet 2 Filed July 29, 1957 Dec. 17, 1940. D. DAY 2,225,370

AUTOMATIC SEWING MACHINE Filed July 29; 1937 5 Sheets-Sheet 3 mum w a Z 9 3 A 35104 3' I a .20. gwuc'vvbom 105 Daniel flay Sum;

III/11111141141171. I

Dec. 17, 1940. D, DAY 2,225,370

AUTOMATIC SEWING- MACHINE Filed July 29, 19s? 5 Sheets-Sheet 4 Dec. 17, 1940. D. DAY

AUTOMATIC SEWING MACHINE Filed July em-1937 5 Sheets-Sheet 5 Patented Dec. 17, 1940 w 2,225,370

UNITED STATES PATENT OFFICE AUTOMATIC SEWING MACHINE 1 Daniel Day, Columbus, Ohio Application July 29, 1937. Serial No. 156,379

8 Claims. (01. 112-186) This. invention relates to sewing machines and wheel with pitman which transmits power to is particularly directed to improvements-in autoa walking beam employed in the machine;. matic sewing machines of the type shown in my Fig. 6. is a. vertical transverse sectional. view copending application Serial No. 74,039 filed April on the line. VI VI of Fig. 1 and shows a front I n 13, 1936, of which this application is a conelevation of the shuttle and the mechanism used: 5

tinuation-in-part. to operate the same; H

The primary object of this invention resides Fig. 7 is a detail sectional view taken on the. in the provision of an automatic sewing machinev plane indicated by the line VIIV'II of Fig. ,6; which can be operated by relatively unskilled Fig. 8 isa similar view on the plane indicated. l0 labor and will yet produce neat and eiiicient by the line VIII-VIII of Fig. 6; work. Fig. 9 is a detail horizontal sectional view taken.

It is also an object of the invention to provide on the plane indicated by the line IX- -Ix of a sewing machine which will perform accurate F sewing operations regardless of the direction of 10 is a horizontal Sectional View Of e movement of the work through the machine. A W end of the base of the machine, he plane 15 shuttle and drive mechanism is provided with of the section being indicated by the line X.X

mechanism to time the operation thereof upon of Fig. 1. This section illustrates the bobbin the reversal of direction of movement of the winding and inserting mechanism. work. h Fig. 11 is asimilar view illustrating the same 7 It is a further object to provide a sewing ma mechanism at the precise. instant a freshly WOllI'id chine having means to automatically wind and bobbin hasbeen positioned in the shuttle;

insert new bobbins in the shuttle whereby the Fig. 12 is a vertical sectional view taken on thelength of a continuous sewing operation will be plane indicated by the line XII--XII of Fig; 10

7 limited only by the size of the original spool of Fig. 13 is a similar view on the plane-indicated thread. I by the line X IIIXIII of Fig. 10; 23" It is also an object of the invention to provide Fig. 14 is a vertical lon Sectional V ew a drive mechanism for the bobbin winding and 0n the eX V of replenishing device which will operate continu- Fig. 15- is. a vertical transverse sectional view ously regardless of the direction of movement of on the plane indicated by the line XVXV of. the goods or work through the machine. Fig..10; 4 30" Another object of the invention rests in the Fig. 16 is a similar view on the plane indicated provision of means to control the size of the by the line XVI-XVI of Fig. 10; stitches made by the machine. and means to ,Fig. .17 is also a similar viewtaken on theindicate the size of the stitches to be made. planev indicated by the. line XVII-XVI I. of. 1 v With these and other objects in view, the in- Fig. 10; g 35 vention resides in the combination of elements Fig. 18 is a front elevational view of an ad-.

and their arrangement as will be more particujustable wedge-shaped timing plate forming a.

larly pointed out in the following description part. ofthe bobbin inserting mechanism;

and the accompanying drawings, in which: Fig. 19' is an. enlarged detail longitudinal. sec- 1 is a sid l vati n f a win ma hin tional view of the bobbin winding mandrel toformed in accordance with the present invention, gether withv associated mechanism;

parts being broken away to Show the internal Fig; 20. is. a similar view of the same mechamechanism; nismwith' a fully wound bobbin thereon.

Fig. 2 is a vertical transverse sectional view I v F1g.2Oa. IS a detail vertical longitudinal sectaken on the lme 11-41 of 1 and shows the tional view of the front end of the windingman- Workengagmg Wheel and tram of gears used to dreland shows the-thread retaining gate memtransmit driving power to the main shaft; 7 Fig. 3 is alsimflar View taken on a plane her after 1t has been moved to an open position dicated by the line III-III of Fig. 1 and. shows by a fully Wound coil of thread in the t passthe fly or balance wheel and gear train connecting from the mandlfel to the Shuttle? 50 m t Same with t main haft in. rear Fig. 21 is a detail sectional view taken on the elevation; plane-indicated by the line XXI-XXIioffFig. 7.

Fig. 4 is a horizontal sectional view taken on and showing mechanism Producingo the1ine'IVIV of Fig. 3; onithebobbinthread.

Fig. 5is=a' front elevation of' th'efiy or balance Fig: "22 is a perspective view of a sli'dabl'y 5 shuttle in their operative positions.

Fig. 26 is a view similar to Fig. 25 with th levers in position to transfer motion fromth'e shuttle to the thread severing member; 1

Fig. 27 is also a similar view showing the thread severing member moved to a fully retracted position' and the shuttle in position to receive a fresh j coil of bobbin thread. y I

Fig. 28is a front elevation of the shuttle in the same position as in Fig. 27, the bobbin cover plate on the shuttle being in an open position.

Referring more particularly to the drawings,

the' 'nu'meral l designates the, entire machine forming the present invention." This machine is formed to include a base plate/Z on whichis mounted a cast body -frame 3'having a work supporting end {and an upright column 5-'provided with an overhanging head 6 at its forward portion: The body frame is 'formedwith a longitudinally' extending :slot in its upper portion to receive a walking beam 1 used to transfer motion from one part of the machine to another. The overhanging head 6 is formed to include a vertical -bore in which is mounted for sliding movement a needle supporting-bar 8 carryingthe usual sewing machine needle 9 at its lower end. The upper end of the needle supporting bar is pivotal-1y united with the forward end of the walking beam l which is made in two sections, namelyga primary] section I0 pivoted intermediatelyof its ends as-at II, and, a secondary section l2 fulcrumed at one end as at l2a.

The forward end'of'the primary section in is connected with the intermediateportionof the secondary section [2 by means of a connecting pin l3i The rear portion of the secondary sec 50 tion I2 is bifurcated to receive the forward portion of the primary section I0. The opening-in the primarysection-IO to receivethe connecting pin I3 is slotted-as at M to; compensate for relative movement between the two levers resulting-from differences in the distances from the fulcrum points of the two levers to the confleeting-pin. The rear portion of the primary section is connected by means of a screw I5 to a clevis member [6 forming a part of a universal 6Q coupling H which is connected with the upper end of a pitman 18 used to transfer movement;

from a crank pin l9, eccentrically mounted on a flywheel 20, to ,the .walking.v beam. ..The degree of eccentricity of the crankpin may. be varied by moving a dovetail plate 2|,in a similarly formed slot in the flywheel as shown in Fig, 4.

The screw m used to secure the crank pin to the plate also serves ;to,lock the dovetail plate 211m its various positions of adjustment. 70 The flywheel 20 is rotatably carried by a shoul-f "dered screw2Z'threaded into the. rear portion. of the bodyframe 3. ISecured to the back of the flywheel is fan enlarged flange forming apart of a pinion 23 which is in constant meshing engagement.with an, enlarged idler gear 24'secured-to the body frame by a screw 25. The idler gear 24 is arranged to mesh with a driving pinion 26 secured by means of a nut 2'! to one end of a main shaft 28 rotatably supported by bearings 29 positioned in a longitudinally extending bore 30 formed in the lower portion of the body frame 3. At the forward portion of the body frame, as shown in- Figs. 1 and 2, the main shaft carries a driving spur gear 3| in constant meshing engagement with an enlarged idler gear 32 fixed toQa' speedmultiplying pinionl33 driven by a main driving gear 34 securedto one face of a knurled, work engaged driving wheel 35.

'Ihe wheel 35 is so positioned that a small chord thereofwill project above the upper surface of the" work supporting end of the machine and. will. be engaged by the work as it is moved through the machine during sewing operations. The *work engaging wheel 35 is rotatably supported by a screw 36 about which is positioned a shouldered bearing bushing 3! (see Fig. 10). Ihe'headed end of the screw 36 is receivedwlthin an opening formed in a partition wall 38 "carried by the body frame and separating the chamber; in whichthefdriving ,wheel is, positioned, from the restof theworksupporting end of the frame 3. The partition wall 38 alsojforms the support for the shuttle mechanism 38. This mechanism, as shown in Figs. 6; 7 and 8, includes a shuttle 3911' inwhich is formed a bore for the reception of the coiled bobbin thread. The partition wall is formed with a slot 40 to receive the needle on its downward stroke. The'shuttle 39a The lower endof the plate is connected by means of a link and lever system 43 to .a shuttle drive pinion pivoted to the lower portion of the partition wall by a shouldered screw 45 shown in Fig. 9. One link 43a of the lever system .43 is connected with a' crank pin 46 carriedby the shuttle drive pinion 44. As, the pinion 44 revolves, the crank'pin 4 6will move in a circular path and this movement will betransmitted by the system i 43, to the shuttle support plate-to cause the-shuttle to move backward and forward across the needle slot. The pinion 44 is driven by a timing pinion 44a with whichit is, in constant engagement. 'WThe pinion 44a is keyed forI rotation with the main shaft by means of the key 4l car ried by the main shaft and extending into alkey-way 48'formedin the pinionfla. This key-way extends concentrically avportion of the distancea'bout the bore formed, to receive the main shaft as illustrated in Fig. 6. The purpose of this form of key-way will be set forth hereinafter. To prevent the timing pinion from moving longitudinally of the mainshaft, the latter is provided adjacent ,the pinion with a retaining collar 43. j

The borein the' fshuttle. is provided. with a centering bossq50 about which is positioned a sleeve 5l held on the boss by means of a screw 52. This sleeve is provided for the purpose of reducing friction between'the bobbin and the boss more readily. To prevent. thedislodgment' of the bobbin, the shuttle is provided with a cover 53, pivoted to the shuttleiasz'at 54 in Fig. 6. Adjacent the pivot 54?, the shuttle is also provided with. a. needle typespring 55 which engages the cover and holds the. same in a closed position. While the bobbin is being moved into the shuttle,

the cover will be swung to an open position by means hereinafter described and after being'positioned therein, the'spring. will move-the cover to a position to prevent the bobbin from moving out.

With the mechanism thus far described, the sewing operation may be-performed. For example, thework is movedacross the work support-- ing end. of the machine in engagement with the driving: wheel- Thiswill cause the driving wheel to rotate and by means of the train ofv gears, rotary. movement will. be imparted tothe main shaft. This rotary movement will cause corresponding rotation of the flywheel and motion willlbe transmitted by meansof the pitman from.

the flywheel; to. the walking beam and thence to the needle bar. Movement of the needle bar will cause the. needle. to be reciprocated vertically into and out of the slot in the partition wall. The particular jointed arrangement of the walking beam will provide multiplied or increased movement on thepart of the needle bar xwith respect to the movement of the wristpin on the flywheel. This arrangement is provided to give increased-.momentum to the needle in order that it will quickly move into and out of the work.

To prevent slippage between the work and the driving wheel, the overhanging head, as shown in Fig. 2, is provided with a second vertical bore to receive a presser foot supporting rod 56 which carries the presser foot 5-! at its lower end and is provided with an operating pin 58 extending through a bayonet slot 58a formed in the overhanging head. As the operating pin is moved upwardly in the slot 58a, the presser footwill be raised against the action of a spring 59 which provides the force necessary tohold the work in secure engagement with the driving wheel. The force of the spring can be varied according to the needs by means of an adjusting nut 69 threadedly received on the supporting rod 56.

An arcuate arm 6! is secured at its lower end to the needle supporting bar and extends-through a guide slot 62 formed in the overhanging head of the frame. As the needle bar moves up, the outer end ofthe arm will be moved away from the head to take up the slack in the thread. The outer end of the arm 6| is provided with an opening 63 through which the thread leading from a spool holder 64 is passed. Between the arm SI and the spool holder 64, the thread passes through a thread guide 65 made adjustable to provide tension on the thread leading from the spool holder so that the needle loop may be drawn tight to lock the same about the bobbin thread.

After the needle has moved to its lowermost position and has started on its upward stroke, a loopwill be formed in the thread and the shuttle will move through this loop to position the bobbin thread therein. The shuttle may also be provided with an adjustable thread tension device 6501, illustrated in Fig. 21, to provide the bobbin thread with a resisting force substantially equivalent to the tension applied by the adjustable guide 65 for the needle thread. The top of the body frame-as well as the back: portion are pro-,

the working parts of the machine;

Adjacent the shuttle mechanism, thework supporting end of the machine is provided with: a chamber. in which is housed the bobbin winding. and inserting mechanism 61. Thismeohanism, shown in detail in Figs. 10 and 11, includes a Winding. mandrel. 68 rotatably supported by the frame of the machine and anintermediate bearing 69 formed on a bracket Ill. The mandrel 68 is provided adjacent one end with twin pinions ll-1|, one of which is in engagement with a.

large idler gear 12 which in turn engages a forward driving, pinion 13. The pinion I3 is con-- nected to the forward end of the main shaft by means of a ratchet and. pawl 14 and I5, respectively (seeFig. 12) The pawl is resiliently held in engagement with the. ratchetby means of a This mechanism permits the main; shaft to drive the pinion 1 3 when rotating in one spring 16;

nism is similar to the pawl and ratchet mecha-' nism. above described but the ratchet is reversed in order that the gears will be driven when: the main shaft rotates in the reverse'direction which will be caused when the work is moved rearwardly through the machine. Two idler gears areprovided in order that the reverse rotation of the main shaft will not be transmitted to the winding mandrel, but rather the latter will be rotated in the same direction as when rotated by the driving pinion 13. necessary to cause a continuous movement of the winding mandrel regardless of the direction of movement of the work through the machine.

The forward end of the mandrel is made tubular to receive pick-up wires 82, shown in Figs. 19 and 20, secured at their inner ends to a carrier block 83= slidably positioned in the mandrel. A wire 84 connects the carrier block with the inner'end of a lever 85- pivoted as at 86- to a collar 8'? non-rotatablysecured tothe mandrel. The lower end of the lever 85 is also connected to one end of a spring 88, the opposite end of the spring being connected to a pin 88a. The tension of the spring 88 serves to draw the carrier block and pick-up wires into the mandrel. This movement is counteracted by means of a flange 89- engaging the upper end of the lever 85. The. flange- 89 is formed on a sleeve member 99 slidably positioned on the mandrel 68. This sleeve forms a part of the bobbin moving mechanism 9i and includes a ring 90a at its forward end. A second ring 92 is slidably carried by the sleeve and between these rings, there is positioned a-coil spring 93 which serves tomove the sleeve. member longitudinally of the mandrel for the purpose of moving a bobbin, after itv has been wound, into the bore of the shuttle.

The spring 93 is of the compression type and normally is in its extended. state. To compressmounted: om a boss 9.8: formed in. connectionwith- 7 vided -with

cover members

66 and 66a to hide This arrangement is the bracket 10. The block 95 has formed there'- with a fork member 91-which straddles the rear endof thesleeve between the flange and the ring, 92. Screws 98 hold the block in place on the boss so that the latter may move in response to forces applied by a lever 99 pivoted about a vertically, extending pin I00. A tension type. spring IN is provided to move the lever to its tion by a spring I06 illustrated in Figs. 19 and 20.

As the thread accumulates on the, mandrel, the rider plate will be raised and the opposite end of its supporting lever will lower, bearing with it the wedge plate I02.

The inclined edge I02a of the wedge plate engages the outerend of the lever 99 and moves it in opposition to the spring IOI. This motion imparts sliding movement to the block95 through a pin I01 carried by the block and positioned :in a slot in the lever 99. Movement of the block will, compress the spring 93 between the ring members as shown in Fig. 20. When the gate I is released, the power of the compressed spring will cause movement of the sleeve which .will in turn move the accumulation of bobbin thread longitudinally of the mandrel. At the instant the sleeve begins to move, the flange will be moved from engagement with the upper end ofthe lever 85 permitting the spring 88 to draw the pick-up wires into the end of the mandrel.

This movement will completely release the bobbin from the mandrel, permitting it to slide freely from its position on the mandrel toward the shuttle.

The gatemember I05 is moved to an open position by the movement of the bobbin but is normally held in a closed position by an anvil member I08 which is slidably carried in the dovetail guides I09 formed in connection with the bracket I0. The movable anvil is normally held in the path of movement of the gate I05 by a spring IIO connected to the anvil through the use of a connecting plate I I I secured tothe outei end of the anvilas shown in Fig. 17. The opposite end of the spring is connected to the bracket by means of a screw I I2. The inner end of the anvil member engages a stationary hollow ground knife member I I3 and when moved into engagement therewith by the action of the spring after the bobbin has moved into the shuttle, will sever the wound bobbin from its source of supply.

To move the anvil member against the action of the spring, the former is provided with a set of jack knife levers III and Illa shown in Figs.

.10, 11 and 17. The lever H4 is provided with an elongated portion to engage the edge I021) of the timing plate. As the timing plate is moved downward, movement will be imparted to the lever H4 and through its connection with the lever II4a, the free end of the latter lever will be moved into the path of the shuttle. When the shuttle reaches the lever Illa, a protruding edge of the bobbin cover plate, above the pivot 54, will engage the lever and the hinged cover on the shuttle will be swung to an open positlon. Continued movement of the shuttle will then move the anvil member I08 away from the stationary knife. When the anvil member has moved a required distance, the gate I05 will open in response to pressure of the spring 99 and release the wound bobbin. The compressed spring 93 will instantly move the bobbin from the winding mandrel into the opening provided therefor in the shuttle. When the bobbin is moved from its position on the mandrel, the rider plate will drop inresponse to force applied to the lever I03 by the spring I03a. illustrated in Fig. 15. This movement will raise the timing plate and permit the, springcompression lever to be drawn to a normal position byits tension spring. The sleeve on. the mandrel will follow and be moved to its retracted position. The gate will then move to a closedposition in response to the force of spring I06 out of the path of movement of the anvil.

When the timing plate is raised, the jack knife levers will also be released and this action will permit the anvil member to move in response to the spring connected with the outer end thereof. When the anvil engages the stationary knife, the thread leading to the bobbin will be severed. Due to the fact that the knife is hollow ground, a slight space between the V-shaped end of the anvil and the knife will be provided and the severed ends of the thread will be lightly held therein. As the next stitch is made by the machine, the needle loop will engage the end of the bobbin thread and grip the same, drawing it away from its position between the knife and the anvil.

The bobbin inserting operation is so timed, by adjusting the wedge-shaped timing plate relative to the lever I03, that a new bobbin will be inserted immediately prior to the withdrawal of the last bit of the previous bobbin thread. This will cause a splicing of the two bobbin threads and prevent the stitching from being ripped because of the lack of a bobbin thread. After the fresh bobbin has been moved into the shuttle, the bobbin winding mechanism will immediately commence to wind a fresh bobbin. The end of the thread leading from the spool I I5 will beheld by the anvil and, due to the position of a thread guide II6 (see Fig. 15), the thread will be positioned directly across the end of the winding mandrel. Asthe sleeve returns to its normal position, the flange on the rear end will engage the lever 85, causing an outward movement of the pick-up I wires. As these wires straddle the thread, rotary movement on the part of the mandrel will cause the thread to be twisted around the pick-up wires and a new bobbin will thus be started. When this bobbin reaches a predetermined size, the above operations will berepeated.

When a new spool of bobbin thread is started, the free end of thethread is passed through an opening in the casing of the machine, through the guide H6 and across the end of the mandrel. The end is then slipped into a hook I 05a, also shown in Fig. 15,carried by the side edge of the gate I05. If desired, the pick-up wires may be moved into themandrel by pressing down on the lever which carries the rider plate. When this out to engage the thread. When the machine isstarted, the wireswill twist the thread around the mandrel to start a new bobbin.

To perform this threading operation, access maybe had to the winding mechanism chamber by moving rearwardly a cover II'I' slidably carmember slidably positioned on said'sleeve, a coil ried by the-worksupporting end of the-machine.

spring disposed between said ring and -said During the sewing operation, if it is desiredto reverse the direction of movement of the work through the machine,--this can be done without danger of tangling the threads. Due to the shape of the keyway in the timing pinion Me, the shuttle will remain at rest until the needle loop is in the proper position toreceive the shuttle thread. By changing the position of the shuttle drive pinion relative to the timing pinion, the movement of the shuttle relative to the needle loop can be regulated.

From the foregoing description andthe accompanying drawings, it will be apparent that I have provided a sewing machine which will sew-either forward or backward, and will automatically wind and insert new supplies of bobbin thread whenever necessary. This machine may be operated by relatively unskilled labor and will require a minimum amount of service and attention.

While I have shown and described the invention in but one of its many forms, it is my desire to include all variations thereof as may be said to fall fairly within the scope of the appended claims.

What is claimed is:

1. In a sewing machine, a rotatable main shaft, a shuttle mechanism comprising a partition wall provided with a slot to receive the needle of said machine, a carrier plate pivoted to said wall in registration with said slot, an oval-shaped shuttle member loosely held against said wall by said plate, a pinion rotatably mounted on said partition wall, a crank pin eccentrically mounted on said pinion, motion transmitting mechanism connecting said crank pin and said carrier plate, a second pinion in meshing engagement with said first pinion and mounted on said main shaft, said second pinion being formed with a keyway extending concentrically of said pinion a portion of the distance around the bore for said main shaft, and a key carried by said main shaft and extending into said keyway, the width of said key being less than that of the keyway to provide a predetermined amount of relative rotary movement between said main shaft and said second gear upon a change in direction of rotation of the former whereby the movement of the shuttle will be timed in relation to the movement of the needle.

2. In a sewing machine having a drive shaft and a reciprocating needle, a shuttle formed to receive a coiled thread, a pivoted carrier for loosely supporting said shuttle and moving the same in timed relation to said needle, a rotatable gear member, a crank extension provided on said gear member, motion transmitting mechanism connecting said carrier and said crank extension, a gear provided on said drive shaft in meshing engagement with said crank supporting gear, and means for securing said second-mentioned gear to said shaft, said means providing limited relative rotary movement between its said gear and shaft to vary the timing of said shuttle relative to said needle when the direction of rotation of said shaft is reversed.

3. In a sewing machine having a shuttle formed for the reception of a coil of thread, means for automatically winding and inserting a coil of thread in said shuttle, said means comprising a rotatable mandrel, driving means for said mandrel, a sleeve member surrounding said mandrel and slidable thereon, said sleeve member being provided with an annular flange, a ring flange, lever means engaging said ring tomove the same to compress said spring, gate means in registration with said mandrel and retaining the coilof thread thereon during the winding operation, means moved by said shuttle for effecting the release of said gate means and s'aidcoil of thread, and pivotedmeansactuated by the 'variation in size of the coil of thread for jnioving said spring compressing lever and controlling the actuation of said gate releasing means.

4. In a sewing machine having a rotatable thread, means operated by said drive shaftffor moving said shuttle in timed relation :to -said *needle', means disposed between said "drive shaft and said shuttle moving means for varying the time of movement of said shuttle with respect to said needle when the direction of rotation of the drive shaft is reversed, automatic means for winding and positioning a new coil of thread in said shuttle, said means including a winding mandrel substantially in registration with said shuttle, gear means connecting said mandrel and said drive shaft and operating to rotate the former in a single direction irrespective of the direction of rotation of said main shaft, asleeve movable longitudinally on said mandrel, a flange formed on said sleeve, a ring slidably carried by said sleeve, a coil spring disposed between said flange and ring, lever means for-moving said ring to compress said coil spring, gate means disposed in registration with said mandrel and operating to retain the coil of thread thereon during the winding operation, release means for said gate, said release means being operated by the shuttle, and movable means actuated by the variation in size of the coil of thread for moving said spring compressing lever and controlling the actuation of said gate releasing means.

5. In a sewing machine having a rotatable drive shaft and a reciprocating needle, a. shuttle formed for the reception of a coil of thread, means operated by said drive shaft for moving said shuttle in timed relation to said needle, means operative upon change of direction of rotation of said drive shaft for varying the time of movement of said shuttle with respect to said needle, automatic means for winding and positioning a new coil of thread in said shuttle including a winding mandrel substantially in registration with said shuttle, means for moving the coil of thread from the mandrel into said shuttle, gate means between the mandrel and shuttle for retaining the coil of thread in position on said mandrel during the winding operation, and means engaged by the shuttle operated by the movement thereof for efiecting the release of said gate means.

6. In a sewing machine having a shuttle formed for the reception of a coil of thread, automatic means for winding and positioning a coil of thread in said shuttle including a winding mandrel, means for moving the coil of thread from said mandrel to said shuttle, gate means between the shuttle and mandrel for retaining the coil of thread in position on said mandrel during the winding operation, spring-pressed slidable means positioned adjacent the shuttle and operated by the movement thereof for effecting the release of said gate means, and stationary knife means engaged by said slidable means on the latters return to a normal position to sever "driveshaft and a reciprocating needleya shuttle formed for the reception of a 'wound coil of the coiled thread from the source of supply.

7. In a sewing machine having a main shaft, a shuttle mechanism comprising a supporting wall having a recess to receive the needle 0! said machine, a carrier plate movably supported by said wall, an oval-shaped shuttle member having an opening formed therein, said shuttle being loosely held against said wall by said plate, a crank. pin movable backward and forward by said main shaft, motion transmitting mechanism connecting said crank pin with said carrier plate, means driven by said main shaft during sewing operations for winding a coil of thread and means driven by the main shaft during sewing operation for moving the coil of thread into the opening in said shuttle 8. In a sewing machine having a shuttle formed with an opening therein, means provided adjacent said shuttle for automatically winding and inserting a coil of thread in the opening therein, said means comprising a rotatable mandrel, means connected with and rotating said mandrel, a sleeve member slidably carried by said mandrel, resilient means for imparting slidingmovement to said sleeve member, lever means