US2119225A

US2119225A - Shoe sewing machine

Info

Publication number: US2119225A
Application number: US745692A
Authority: US
Inventors: Stevenson A Dobyne; John C Dobyne
Original assignee: Individual
Current assignee: Individual
Priority date: 1934-09-27
Filing date: 1934-09-27
Publication date: 1938-05-31
Anticipated expiration: 1955-05-31

Description

May 31, 1938. s. A. DOBYNE ET Al.

SHOE SEWING MACHINE Filed Sept. 27,` 1934 3 Sheets-Sheet l S. A. DOBYNE ET4 AL May 31, 1938.

SHOE SEWING MACHINE Filed Sept. 27, 1934 5 Sheets-Sheet 3 `45 and. y

Figure 13 is an enlarged detaily of the feed cam.

Patented May 31, 1938 PATENT OFFIQE SHOE SEWING MACHINE Stevenson A. Dobyne and John C. Dobyne, St. Louis, Mo.

Applaationseptember 2:1, 1934, serial No. 745,692

19 Claims.

This invention pertains to shoe sewing machines, and more particularly to the type of machine known as the McKay stitcher.

One of the objects of this invention is to provide a machine of this type of simplified construction and operation;

Another object is to provide improved stitching mechanism for such a machine;

Another object is to provide improved driving means for such a machine whereby a variation in speed may be obtained in a simple manner;

Another object is to `provide improved mechanism adapted to measure a length of thread for each stitch in accordance with the thickness of the work;

Another object is. to provide improved Waxing means for such a machine.

Further objects will appear from the following description when taken in connection with the accompanying drawings, in which:

Figure 1 is a side view of a machine embodying this invention;

Figure 2 is a detail section on line 2-2 of Figure l;

Figure 3 is a detail View of a section of the driving pulley;

Figure 4 is a detail vertical section along the axis of a countershaft;

Figure 5 is an enlarged front view of the sewing head; Y

' Figure 6 is a side View of Figure 5 as seen from the opposite side from Figure 1;

Figure 7 is a detail of Figure 6;

Figure 8 is a detail of Figure 5 in which parts 0 have been omitted and in which other parts are sho-wn in section for clarity in illustration;

Figure 9 is a detail section taken on line 9 9 of Figure 5;

, Figure l() is a detail similar to Figure 8 but Showing the feeding mechanism;

Figure 11 is an enlarged vertical section of the wax pot; e

Figure l2 is a detail front view of Figure 11;

of special form which will be described in detailv hereinafter, which driving pulley 'I is connected by` a round belt 8 with a pulley 9 running loosely on the main shaft I of the sewing head.

The standard I has mounted at the top thereof and so as to project forwardly a supporting plate II which carries the sewing head. Formed or mounted on the plate II are bearing brackets I2 and I3 in which the main shaft I is journaled. A releasable clutch i4, the operation of which will be described later, is arranged to connect the pulley 9 with the shaft I0 to drive the latter when required for sewing.

Needle bar 'mechcmz'sm The bracket I 3 has a forwardly projecting head I5. Slidably mounted in guides in the head I5 and the plate II is a needle bar I6. The needle bar is guided for vertical movement in the guide openings in the head I5 and the plate II, and is maintained against rotation by a clamp I'I secured to the needle bar and having spaced ends slidable along an upright guide rod I8 secured in the plate II. Where the needle bar passes through the head I5 it is engaged by a friction plug I9 lodged in a bore in the head I5 and pressed by a spring 2i) against the needle bar, said spring being retained by a screw 2l. This serves to frictionally retain the needle bar in whatever position it may be until acted upon by the driving mechanism.

Mounted on the needle bar vI6 is a slide 22 which may slide vertically along the bar. The downward movement of this slide is limited by a stop 23 clamped to the needle bar so as to be engaged by the slide upon its downward movement. A washer 24 of leather, or the like, provides a buffer between the slide and the stop.

The rear face of the slide 22 has a groove 25 adapted to receive a roller 2S on a crank pin 21 projecting from the face of a crank disk 23 xed on the shaft IU. 'Ihe shape of the groove 25 is illustrated in Figure 8. This groove has a certain portion thereof indicated at 25H which is circular and concentric with the shaft I!) when the crank pin 21 is lin its lowermost position, as shown in Figure 8. This shape provides, therefore, that there will be a pause in the movement of the needle bar at the lowermost point of its stroke. This pause is provided in order that the thread may be engaged in the hook of the needle by the action of the whirl. The direction of rotation of the shaft I0 is indicated by the arrow in Figure 8. This gives the slide 22 a reciprocating motion along the needle bar with a pause at its lowermost position.

Adjustably clamped to the needle bar above the slide 22 is a collar 29 xed by a set screw 30 or other suitable means. This collar carries a stud 3| on which is pivoted a latch member 32 adapted to engage an upstanding abutment 33 on the slide 22. The latch member 32 has a rearwardly eX- tending arm 34 held by a spring 35 against a stop pin 36. The latch 32 and the abutment 33 are preferably constructed of hardened steel in order to withstand the wear occasioned by their relative movement. Pivoted on a shaft 31 journaled in a bearing 33 on the head I5 is a cam 39 whose lower cam portion extends into the path of the arm 34 as the latter rises with the needle bar. A spring 4G von the shaft 31 is arranged to tension the cam 39 so as to retain it against a stop 4|. By movement of the stop 4|, as will be described hereinafter, the cam 39 may be rotated on the shaft 3?. shape of the lower edge of the cam 39, the distance traveled by the arm 34 before engaging the cam may be varied. When suchV engagement takes place the continued rise of the needle bar |B causes the latch 32 to rotate on its pivot 3| whereby said latch is carried forwardly to disengage it from the abutment 33. This releases the needle bar from the slide 22. The needle bar is now retained by the friction device 20 while the slide 22 may rise further in accordance with the action of the crank 21.

It will be seen that by Variation of the height of the'abutment 4| the cam 39 may be Voperated to vary the height of the up-stroke of the needle bar |5. The down-stroke of the needle bar, however, is always limited toV a constant lowermost position by engagement ofthe slide 22 with the stop 23. Thus the needle is always moved downwardly to a constant position in order to receive the loop of the thread while the height of the up-stroke may be varied in accordance with the thickness of the work as will vbe described more fully presently.

A cast-off I 38 engaging the needle in the usual manner has a shank extending upwardly through a vertical bore in the needle bar I6. The upper end of this shank is clamped to an arm |40. This arm has a vertical bore slidable onfa rod I4I. `Said rod is in turn slidable in a sleeve |42 adjustably mounted in the plate I and secured by a set screw |43, or other suitable fastener. The sleeve |42 is provided with a frictional retaining device |44 similar in all respects to the device I9, 2li already described. The rod |4I is guided in the sleeve |42 at its lower portion and at its upper portion in a vertical bore in the stop 23. The upper end of the rod has secured thereto a collar |45 provided' with a stud adapted to receive the hooked end of a spring |46. The lower end of this spring rests in a socket in-the arm |40. The spring |46 acts to depress-the arm |40 against an adjustable stop collar |41 securedsto the rod |4I. Another adjustable stop collar-|48 is vsecured to said rod just below the stop 23.

The movement of the cast-off f |38 is controlled by movement-of the needle bar I6. The spring |43 retains the arm Mil-depressed against the collar iil and also providesa yielding abutment for the cast-off in case the latter strikes an obstruction in descent. As the needlebar-descends the stop 23 engages the collar |48 and moves the rod |42 downwardly in its guides, carryingwith Y it the cast-off |38. AsV the needle bar rises again,

the frictional retainer |44 retains the rod`|4| in its lower position until the needlev brings the loop of thread in its hook up under the cast-off and through the loop of the previous stitch. There- By such rotation on account of the after the stop 23 engages the collar I 45 and the cast-off moves upwardly with the needle bar.

Thread measuring mechanism A presser foot 42 is mounted on a presser bar 43 which is also vertically slidable in guides in the plate and the head I5. The upper end of the presser bar 43 carries a bracket 44 in which is adjustably mounted the stop 4|. This stop may have the form of a screw threaded in the bracket 44 for adjustment and fixed by a jam nut 45.

t will be seen, therefore, that by elevation of the presser bar 43 the stop 4| is elevated and the cam 33 is moved accordingly.

The raising of the presser foot is accomplished by a cam 46 on the main shaft lil. Loosely pivoted on a shaft 41 journaled in the bracket i3 is a bell crank, one arm 48 of which carries a roller 43 engaging the cam 45. The other arm 50 of said bell crank carries an adjustable abutment 5| engageable with a lifting dog 52 which operates to lift the presser bar 43. The dog is pivoted at 53 to a collar 54 slidable on the presser bar 43. The inner end of the dog 52 is formed to provide a clamping cam 55 which bears against the presser bar when the rear end of the dog 52 is elevated by the abutment 5|. This operates to grip the presser bar to elevate the same whenever the abutment 5| is elevated.

The presser bar 43 is depressed by a spring |54 surrounding the bar and bearing at its upper end against the head I5 and at its lower end against a collar |55 adjustable along the presser bar. A second spring |56 surrounds the presser bar bearing at its upper end against the collar |55 and at its lower end against the collar 54. This spring serves to keep the collar 54 depressed against an upstanding stop |51, see Figure 6, mounted in the plate Il and secured by a set screw E58 or other suitable fastener.

As the collar 54 is normally slidable along the presser bar so long as the abutment 5| is depressed and since the dog 52 is normally depressed by a spring 56, the presser bar may be raised and lowered independently of the action of the abutment 5|. Whatever the position of the presser bar, as soon as said abutment is elevated, the dog 52 will operate to grip the presser bar and lift it a normal distance from its initial position at which the gripping occurs. The up and down movement of the abutment 5| is uniform as controlled by the cam 46. The presser foot, however, will be elevated initially in accordance with the thickness of the work operated upon. During such elevation the presser bar will slide upwardly through the collar 54. The lifting action of the dog 52 will now take place from this initial elevation. Accordingly, the presser bar will'be lifted higher, the thicker the work operated upon. As previously described, the height of elevation of the presser barcontrols the position of a stop 4| and through it the position of the cam 39. This mechanism, therefore, controls the height to .which the up stroke of the needle bar is carried.

As the total elevation of the presser bar is governed by the thickness of the work operated upon the extent of the up stroke of the needle bar will be similarly governed and accordingly the needle will measure olf a length of thread in accordance with the thickness of the Work.

In order to provide adjustment for wear, the crank disk 28 and the cam 45 are adjustably mounted on the shaft I3, being secured by set screws |49 and |53, see Figure 7. The disk 28 is provided with an off-set portion |5| adapted to enter the counter-bore |52 in the cam 45. These by the feed cam 51 on the main shaft I0.

two

members

28 and 46 are both secured to the shaft I9 by the same key |53 which is preferably placed so that its center is opposite the rear face of the off-set I| so that both members will have the same bearing on the key. By this arrangement the crank disk may be -kept snugly up against the slide 22. Wear may be taken care of by loosening the set screw |49 and moving the disk on the shaft I0.

Feeding mechanism The feeding mechanism of the awl is controlled This cam has the form shown in Figure 13 and is provided with a separate section 58 pivoted at 59 on the cam 51 and p-rovided with an adjusting screw 68 threaded in a lug 6| on the section 58 and bearing against the hub 62 of the cam 51. The. screw 69 provides adjustment to vary the throw of the cam. The section 58 may be secured in adjusted position b-y a clamping nut 63 or other suitable fastening.

The shaft 41 is journaled in a sleeve 64 clamped in a split socket in the bracket I3, one or more clamping screws 65 being provided in order to secure the same. This arrangement is such that as the sleeve 64 is slightly longer than its socket an endwise adjustment is provided in order to take up wear of the various parts and maintain a good fit.

Fixed to the shaft 41 is an arm 66 carrying a cam roller 61 adapted to run on the cam 51, 58. A spring 68 on the shaft 41 maintains the roll in engagement with the cam. The shaft 41 has fixed thereto a second arm 69 extending downwardly therefrom and pivoted at its lower end to a link 19. The link 18 has a pin 1| carrying a roller 12 adapted to run in a curved slot 13 formed in the upper portion of the presser foot 42. The pin 1| carries an awl shank 14 spring-pressed against the presser foot. The awl shank 14 carries a laterally extending cam 15 adapted to engage a guide pin 16 on the presser foot.

The action of this mechanism is as follows: The shaft 41 is rocked by the arm 66 in response to the movement of the cam 51, 58. This swings the arm 69 laterally, as indicated in dotted lines in Figure 10. By the shape of Ythe slot 13 the first portion of the movement toward the left, Figure 10, of the arm 69 and the link 18 will carry the roller 12 downwardly along the inclined portion of the slot. This causes the awl 11 to pierce the work. Further movement ofthe link 18'carries the upper end of the awl shank to the left and the cam 15 now engages the pin 16 which in response to the` movement toward the left throws the awl 11 to the left to execute the feeding movement. This movement, of course, is properly timed with the rest of the stitching mechanism by properly positioning the 4several cams on` the shaft I8. The extent of the feeding movement is adjusted by adjusting the cam section 58 as already described.

Thread control Fixed to the shaft I0 is a bevel gear 18 which incidentally carries a hand wheel 19 by which the shaft may be rotated by hand when desired. The bevelled gear 18 engages a similar gear 88 on a vertical shaft 8| suitably journaled in the standard I. This shaft carries at its lower end a bevel gear 82 engaging a corresponding gear 83 on a shaft 84 also journaled in the standard I. The latter shaft is again connected through bevelled gears 85 and 86 to a shaft 81 journaled vertically in the standard I and extending upwardly to the horn 88. The latter is suitably swivelled on an extension 89 o-f the standard I so as to be rotatable in the usual manner.- The shaft 81 is connected to drive a suitable chain of connections extending along the horn 88 so as to operate a whirl in the tip 9|] of the horn. This whirl operating mechanism may be of any suitable type well known in the art and no detail description thereof will be necessary here.

Mounted on the horn 88 and between its swivel mounting on the extension 89 and the tip 98 is a wax pot 9|. The wax pot is provided on each side thereof with a forwardly extending rod 92 only one of which appears in the drawings. These rods engage sockets 93 one on each side of the horn 88. The wax pot itself is partly housed in a suitable opening in the lower portion of the horn 88. The mounting is thus removable so that the wax pot may be slid from its housing, the rods 92 being slid out of their sockets 93. This movement takes place to the left Figure 1. Suitable latches may be provided to retain the wax pot in its operating position entering the horn as illustrated in Figure 1.

The wax pot has the general form shown in section in Figure 1l and provided with a cover `94 hinged at 95 to the rim of the pot. The cover is provided with a downwardly extending-arm 96 carrying near its lower end a roller 91. A similar roller 98 may be arranged on the hinge pin 95. An outlet bushing 99 for the thread is also provided in the cover 94. This bushing is located within the horn 88, when the wax pot is in place, as may be seen from Figure l. The outer face of the wax pot is provided with a pair of pins |00 over which the thread 18| may be passed as is indicated in Figure l2. A plate |92 pressed by a spring |93, whose tension may be adjusted by a thumb nut |84, bears against the thread, as shown in Figures 11 and 12, so as to provide a thread tension. The plate |92 is mounted on the pins |89 and the tensioning stud |85, being otherwise loose so that by drawing the upper end of the plate |82 to the left, Figure 11, the tension on the thread may be released. The thread lill passes into the horn through the wax pot and from the bushing 99 directly up the horn and through the whirl in the usual manner as may be seen from Figures 1 and 11.

This arrangement places the wax pot in a position above the swivel of the horn and as close as possible to the tip` 98. As a result the length of thread which extends between the wax pot and the tip 99 is reduced to a minimum. It is a custom with operators when the wax on the thread becomesgummy to draw out a length of thread equal to that extending from the tip of the horn down io the wax pot in order to provide freshly waxed thread for the sewing operation.

The extent of thread thus extracted is usually cut off and wasted. Placing the wax pot as near as possibleto the tip 99 the percentage of thread thus wasted is greatly reduced. As this thread is quite expensive, a considerable item of saving is effected thereby.

' Control mechanism Pivoted on a cross shaft 96 journaled in the foot of the standard I is a starting treadle |91 and a presser foot control treadle |98. The

Y latter treadle is connected by a link |99 passing v upwardly within the standard I to a lever pivoted at I|| 'on the plate li. The forward end of the lever I I8 is arranged below a stop |12 adjustable in a clamp I3 clamped to the presser bar 113 and guided by an upright standard H4 fixed in the plate The clamp ||3 and the guide ||4 are similar to the clamp `|1 and the guide I3 described hereinbefore. By pressing downwardly on the treadle |08 the rod |09 is pulled downwardly thereby rocking the lever H on its pivot, the forward end of which engages thestop |2 to lift the presser bar and with it the presser foot 42. Thus the operator may lift the presser foot to insert the work thereunder.

The treadle |01 is connected to an upwardly extending push rod ||5 guided in a bracket H6 and tensioned downwardly by a compression spring ||1 bearing at its upper end against the bracket H6 and at its lower end against a collar |53 adjustably xed to the rod H5. The upper end of the rod H5 is pivoted to the horizontal arm l |Sl of a bell crank lever whose upwardly extending arm is arranged to operate the clutch |4. Said clutch has a projection |2| normally engaging the end of the arm |20 so as to stop the shaft H0 in a position with the needle bar raised. Extending axially through the clutch ill is a latch |22, spring-pressed toward the right, Figure 6 so that its protruding end may engage a. lug |23 on the pulley 0 whereby to establish driving engagement to rotate the shaft |0. The pulley 0 has two lugs |23 placed diametrically oppositie to one another. The latch |22 has a head |24 and the arm |20 has a tapered extension |25 arranged to pass under the head |24 so as to withdraw the latch |22 and break the driving connection. Lifting the rod ||5 swings the arm |20 downwardly out of engagement with the projection |2| and carries the extension |25 out from under the head |24. This releases the latch |22 for engagement with the lug |23 so as to establish driving connection with the pulley 9 which rotates continuously. The latch |22 will engage one or the other of the two lugs |23. WhenV the machine is to be stopped the treadle |01 is released and the rod ||5 is lowered. This permits the arm |20 to return to normal position. As the clutch I4 rotates, the extension |25 which projects considerably in advance of the rest of the arm enters under the head |24 and withdraws the latch |22 after which the projection |2| engages the abutment |20 to stop the machine in proper position.

The pulley 1 is made in two sections, as illustrated in Figure 4. Each section is generally conical in form but provided with radially arranged sockets I21, see Figure 3, leaving therebetween projections |28. These projections on the different sections of the pulley may be interlocked with each other in telescoping relation as indicated in Figure 4. One of these sections is secured to the pulley 5 which is slidable along the shaft 6 as already described. The pulley 1 thus forms a grooved pulley having a groove, the depth of which may be varied by sliding one of these sections toward or from the other. The belt 8 runs in the groove thus formed but the effective diameter at which the belt runs may be varied by crowding the two sections together or separating them from each other. The rod H5 carries an adjustable arm |29 adapted to engage one arm |30 of a bell crank pivoted at |3| on a suitable bracket on the standard I. The other arm |32 of the bell crank is arranged as a fork to span` the shaft and bears against a washer |33 which in turn bears against the hub of a pulley 5. By raising the rod H5 by means of the treadle |01 the arm |32 will be swung to the left, Figure l, so as'to crowd the two sections of the pulley 1 together thereby narrowing the slot and forcing the belt 8 to climb to an increased diameter on said pulley. An idler pulley |34 on a swinging arm |35 retained by a spring |36 controls the tension of the belt 8 during these changes. A suitable guard |31 may be mounted on the shaft 6 so as to prevent accidental contact with the pulley 1.

It will be noted that there is a certain degree of lost motion between the arms |29 and |30. This permits the rod I5 to be moved sufficiently to engage the clutch I4 before the arm |30 is engaged. Accordingly, by depressing the treadle |01 a short distance, the machine may be started and operated at a low speed. If a long seam is to be made the treadle may be further depressed and the machine is then speeded up so as to shorten the operation.Y It will be further noted that upon releasing the treadle |01, the speed is first reduced by permitting the pulley sections to separate and thereafter the clutch I4 is released and the machine stopped. By thus reducing the speed before stopping the machine, the shock of stopping is greatly reduced.

It will be seen, therefore, that this invention accomplishes its objects in providing a machine of simplified structure and more compact arrangement. ranged that the needle measures ofl a length of thread in accordance with the length of the stitch and in accordance also with the thickness of the work. The measuring of the thread in accordance with the thickness of the work is accomplished by cooperation of the needle bar and the presser foot and its connections so that the up stroke of the needle bar is extended in accordance with the amount the presser foot is raised by the work. At the same time the lowermost point to which the needle moves on the down stroke is retained fixed and a pause is provided in the movement of the needle at this lowermost point. The movement of the presser bar is so controlled that it has a normal amount of lift during the feeding movement above the top of the work and the point at which this lift begins is raised in accordance with the thickness of the work so that said thickness is added to the normal amount of lift. This not only provides proper clearance for the presser foot, but this movement is carried over into the needle bar so as to set off the amount of thread in accordance with the thickness of the work.

Adjustments for wear are provided at all the important points, namely, between the crank disk and the slide on the needle bar and also in the mounting of the feed shaft 41.

The arrangement for Varying the speed renders the machine capable of high speed operation on the work requiring longer seams, while at the same time a low speed of operation may be maintained when required. The increase in speed takes place only after the machine has been started to its normal low speed and conversely after operating at a high speed, the speed is reduced before the clutch is operated to stop the machine. These arrangements provide for reducing the amount of strain on the various parts of the machine and thereby lengthening their life accordingly.

The mounting of the wax pot close to the tip of the horn is also effective in saving thread as already described. This pot is bodily removable for refilling or cleaning.

The rod |59 shown in Figure 1 is arranged to operate the switch, not shown, which starts the motor 3.

While this invention has been described as applied to a specific design of machine, it will The stitching mechanism is so aro able points the up-stroke v those skilled in the art on the basis of the accompanying specification.

It is further understood that various individual features or sub-combinations may be useful by themselves without reference to other features,

or the" complete machine and that the employment of such individual features, or sub-combinations, is contemplated by this invention and within the scope of the appended claims.

It is further obvious that various changes may be made, within the scope of the appended claims, in the details of construction without departing, from the spirit of this invention; it is to be understood, therefore, that this invention is not limited to the specific details shown and/or described.

Having thus described the invention what is claimed is:

1. In a sewing machine of the character de- ,.scrjiloed, a needle bar, driving means therefor, a

presser foot, releasable connections between said driving means and said needle bar adapted to limit .the down-stroke thereof to a constant position, and means controlled by the said presser foot adapted to release said connections at variof said needle bar, whereby said yneedle bar is adapted to measure a length of thread for each stitch in accordance with `the thickness of the work as gaged by said presser foot.

2, In a sewing machine of the character described, a needle bar, driving means therefor, connections between said driving means and said needle bar adapted to limit the down-stroke thereof to a constant position and having means 0 providing a pause in the movement of said needle bar in such position.

3. In a sewing machine of the character described, a needle bar, driving means therefor, a presser foot, connections between said driving g 45 means and said needle bar including `a slide on the needle bar engaging said driving means, vand a stop on the needle bar engageable by said slide.

4. In a sewing machine of the character described, a needle bar, driving means therefor, a presser foot, releasable connections between said driving means and said needle bar, means auto- Amatically controlling the release of said connec- -,tions, and means for frictionally retaining said ,ms-needle bar against movement.

5. In a sewing machine of the character described, a needle bar, driving means therefor having a crank, connections between said driving means and said needle bar including a slide on o said needle bar in driving engagement with said crank, and means for adjusting said crank relatively to said slide.

6. In a sewing machine of the character described, a needle bar, driving means therefor hav- 5 ing a crank, connections between said drivingV means and said needle bar, and means for progressively varying the speed of said needle bar.

'7. In a sewing machine of the character described, aneedle bar, driving means therefor hav- 7() ing a crank, treadle connections between said driving means and said needle bar, and means controlled by said treadle for progressively varying the speed of said needle bar.

8. In a sewing machine of the character de- 75 scribed, a needle bar, driving means therefor` including a mainshaft, a clutch for operating said shaft, a treadle connected to control said clutch, and means controlled by said treadle for varying the speed of said shaft.

l 9.In'a sewing machine of the character described, a `needle bar, driving means therefor including a main shaft, a clutch for operating' said shaft, means for varying the speed of said shaft, a treadle, and connections controlled by said treadle adapted for operation to rst operate said clutch and thereafter increase the speed of said shaft.

l0. In a sewing machine of the character described, a needle bar, driving means therefor including a main shaft, a clutch for operating said shaft, means for varying the speed of said shaft, a treadle,l and connections controlled by said treadle adapted for operationl to first reduce the speed of said shaft and thereafter release said clutch.

l1. In a sewing machine of the character described, a needle bar, driving means therefor including a main shaft, a clutch for operating. said shaft, a treadle connected to control said clutch, and means controlled by said treadle for varying the speed of said shaft including a pulley having mutually telescoping sections relatively adjustable to vary the effective driving diameter thereof.

l2. In a sewing machine of the character described, a needle bar, driving means therefor, a horn adapted to support the work in cooperative relation with a needle in said bar and having a thread guide, a swivel mounting for said horn, a wax pot mounted to enter said horn between said mounting and said guide, and means for guiding the thread to enter the horn through said pot.

13. In a sewing machine of the character described, a needle bar, driving means therefor, a horn adapted to support the work in cooperati-ve relation .with a needle in said bar, and a wax pot slidably mounted on v`said horn. 14. In aI sewing machineof the character dehorn kadapted to support the work in cooperative relation with a needlel inn said bar, a wax pot ounted t o enter .said-'horn'above its base, a tension releasefor the thread on said wax pot and means guiding the thread through said release and then into said horn through said wax pot.

l5. In a sewing machine of the character described, a needle bar, driving means therefor, releasable connections between said driving means and said needle bar, and means for varying the point of release of said connections.

16. In a sewing machine of thecharacter described, a needle bar, driving means therefor, a presser foot, releasable connections between said driving means and said needle bar, and means controlled by said presser foot for varying the point of release of said connections.

17. In a sewing machine of the character described, a needle bar, driving means therefor, connections between said driving means and said needle bar adapted to limit the down-stroke thereof to a constant position, and means retaining said needle bar in such position.

18. In a sewing machine of the character described, a needle bar, driving means therefor, connections between said driving means and said needle bar adapted to move the latter in its downstroke to a constant position and to release the scribed, ay needle bar, driving means therefor, a'

needle bar in such position.

v19. In a sewing machine o f the character described, a needle bar, 'driving means therefor, a 'hollow horn 'adapted to support the Work in cooperative relation with a needle 'in saidvbar, threadcontrollir'ig and waxing means outside of said horn, a part of said Waxing means extending into said horn, and means for guiding a thread through said controlling means to said Waxing means to enter said horn directly through said waxing'means.

STEVENSON A. DOBYNE. JOHN C. DOBYNE.