US2213965A - Sewing machine - Google Patents

Description

Sept 10, 1940- R. NAFTALI El AL 2,213,965

SEWING MACHINE Filed July 19, 1935 s Sheets-Sheet 1 nupd'dk filfiil VALENTINE NAFTALI 8: BY HENRY NAFTAL! a A? oRNEY p 10, 1940- R; NAFTALI; ET AL 2,213,965

snwmg uAcHniE I Filed July 19, 19:55 5 Shoots-Sheet z INVENTORS RUDOLF NAFTALI VALENTINE NAFTALI 8: BY HENRY NAFTALI.

A ORNEY Sept. 10, 1940. R. NAFTALI ET AL SEWING MACHINE Filed July 19, 1935 Sheefw-Sheat 4 m was,

121-% C ORNEY Sept. 1-0, 1 940 R. NAFTALI ET AL sawme MACHINE Filed July 19, 1935 5 Sheets-Sheet 5 Patented Sept. 10, 1940" SEWING MACHINE Rudolf Naftali, Valentine Naftali, and Henry Naftali, Bronx, N. Y, assignors, by mesne assignments, to American Machine 8; Foundry .(IIompany, New York, N. Y., a corporation of New ersey Application July 19, 1935, Serial No. 32,148

12 Claims.

dle having its eye located between the points, I

the opposite ends of which are grasped alternately by the jaws of opposed needle" bars arm ranged in alignment.

One object of our invention is to provide a machine of the character described, having improved threading mechanism by means of which E we are able to quickly thread the needle.

Another object of our invention is to provide a machine of the character described having improved thread holding means making it unnecessary for the operator to secure or release the thread.

Another object of our invention is to provide a machine of the character described in which the thread is prevented from becoming entangled and thereby broken, during the stitching operation.

Another object of our invention is to provide a machine of the character described, having improved looping mechanism.

Still another object of our invention is to provide a machine of the character described, having means to facilitate the quick removal and replacement of the needle.

A further object of our invention is to provide a machine of the character described in which the free end of the thread that is wound on the drum is prevented from becoming entangled with adjacent strands of thread wound on the drum.

A further object of our invention is to provide a machine of the character described having improved work feeding mechanism.

Another object of our invention is to provide a machine of the character described, having means whereby the needle on its down stroke is assured against piercing and therefore -.-breaking the thread.

- Still another object of our vide a machine of the character described having automatic means for starting the tie stitching operation and for stopping when the tie has 50 been completely stitched.

Other objects of this invention will in part-be obvious and in part hereinafter pointed out;

,The invention accordingly consists in the feae tures of construction, combinations of elements, and arrangement of parts which willf'be exembodying our invention;

invention is to .pro-

plifled in the construction hereinafter described, and of which the scope of application will be indicated in the following claims. r In the accompanying drawings, in which is shown one of the various possible illustrative embodiments of this invention:

Fig. 1 is a plan view of the assembly of the apparatus embodying our invention;

Fig. 2 is a view similar to Fig. 1 but in side elevation; v

Fig. 3 is a side view of a portion of the apparatus, partly sectional, disclosing some of the features of our invention;

Fig. 4 is a detail view of a clutching mechanism employed in our invention;

Fig. 5 is an'enlarged view in section of one of the details of our apparatus;

Fig. 6 is a view in section, taken substantially on the line 6-6 of Fig. 5;

Fig. '7 is a front view similar to Fi 3;

' Fig. 8 is a view in detail of a portion of apparatus shown in Fig. 7;

Fig. 9 is a view in section, online 9-9 of Fig. '7;

Fig. 10 is an enlarged detail, in section, of a portion of our apparatus illustrating one of the elements of the operation of the mechanism emthe taken substantially detail in section of a por- Fig. 11 is an enlarged illustrating another eletion of our apparatus ment of the operation of the mechanism emin elevation of aportion element of the operation of the mechanism embodying our invention taken substantially on the line l5-l5 of Fig.'.14;

Fig. 16 is an enlargeddetail in section of a portion of our apparatus ment of the operation of the mechanism embodying our invention;

Fig. 1'7 is a detail view in section, taken substantially on the line "-41 of Fig. 16; and

Fig. 18 is a wiring diagram illustrating one feature of our invention.

- Referringfto the drawings, wherein we have illustrating' another e1efirst describe the operation of the driving mechanism by means of which the needle iscaused to be alternately grasped by the jaws of the upper and lower needle bars. There is provided suitable driving means such as a motor M, supported on a bracket 25. Mounted on motor shaft 26 is a gear 27 meshing with a gear 28 which is mounted on shaft 29, suitably supported as shown, said shaft 29 having also mounted thereon a pulley 30. Pulley 30 may be made to drive pulley 32 by means of a belt 3I. Pulley 32 is freely supported on a fixed, nonrotatable shaft 33 which is held in a support 34 fixed to the casing C. Positioned between pulley 32 and shaft 33 there is provided a collar 35 integral with and extending laterally from pulley 32, said collar being adapted to rotate freely on shaft 33. Mounted on said collar 35 for rotation therewith is a gear 36, cam 31 and cam 38. By this construction it is seen that cams 37 and 38, and gear 36 are integrally connected to move as a unit when pulley 32 is driven by the belt 3|. Said cams 31 and 38, as well as gear 36 are fixedly mounted on collar 35 which is designed to rotate freely about shaft 33. Gem 38 is provided with an annulargroove in which rollers 39 are guided, said rollers being mounted on shafts 46 fixed to plate It is seen from the above construction that plate 4| will be caused to oscillate'with a predetermined regularity in accordance withthe path of the annular groove in cam 38. This predetermined degree of oscillation of plate 4| may be made to be of the same amount as desired for the oscillation of upper needle bar 50 and lower needle bar 5| to alternately clutch the double pointed needle 52 after it has pierced the material to be stitched. The oscillatory motion of plate II may be transmitted therefrom to needle bars 50 and 5I by means such as rocker arms 53 and 56 pivoted to the casing at 55 and 56, respectively. Rocker arm 53 is connected to needle bar 50 by means of a link 51 and to plate M by means of a link 58, while rocker arm 54 may be connected to lower needle bar 5| by means of a link 59, and to plate 4I by..means of a link 66.

. During the operation of our apparatus, as fully described in our Patent No. 1,931,447, it was found that much time was lost by the operator in the threading of the needle and in securing one end of the thread in a fixed position until the stitching of the tie had been completed, at which time the thread had to be released by'some means such as cutting with a knife or breaking.

We have therefore devised a novel mechanism by means of which the needle may be quickly threaded, after which one end of the thread is.automatically grasped and held until the stitching of the tie has been completed,

at which time the held thread is then auto-.

matically released. The mechanism by which we accomplish this may be described as follows:

A threader 65 (see Fig. 3) having a threading hook 66 at one end and a handle I6Iv at the other end, is pivotally mounted on a shaft I68 fixed to upper rocker arm 53. By this construction it is seen that hook 66, which is adapt ed to pierce the eye of the needle 52 to thread it, will always be in proper position to pierce the eye of the needle 52 when said needle is clutched by the upper needle bar 50'. This is due to the fact that shaft I68 about which the.

hook 66 is pivoted is caused to move with neesition to prevent tangling.

tion, and more particularly to Fig. 3, we will dle bar 50 to maintain a constant distance between shaft I68 and the eye of the needle.

In Figs. 16 and 1'7 of the drawings we have shown the hook portion 66 of threader 65 after it has been swung around to pierce the eye of the needle 52. Thread T which is shown looped over the hook, is ready to be threaded in the eye of the needle.

By referring to Figs. 3. and 15 it will be noted that a pair of jaws 61 and 68 of a grasping device III supported on'the'machine casing, are shown held in efiective or closed position by the action of a spring II, whereas in Fig. 16 it is seen that when the threader hook 66 has been inserted through the eye of the needle, the jaws 61 and 68 of the grasping device II! have been forced open by means of a cam 69 rotatably mounted on threader 65 and adapted to ride on lower jaw 68 to force said jaw 68 downwardly against the action of spring II. As the threader 65 is pulled back to be withdrawn from the eye of the needle, hook 66 carries one end of the thread through the eye of the needle to thread the same and thence between the opened jaws 61 and 68. At the same time cam 69 allows lower jaw 68 to resume its normally closed position to grip the thread T between the teeth of the upper and lower jaws 61 and 68 to hold said thread in a fixed position. One end of thread T is thus held fixed for a predetermined time, such as when the tie has been completely stitched, when it is automatically released. We have provided the following means for automatically releasing the held thread at such predetermined time. A vertical plate I2 is mounted on an intermittently traveling work carriage I3. The mechanism by which this work carriage is moved will become apparent as the description proceeds. Attached to plate I2 is a track I4 inclined with respect to the horizontal and suitably positioned and adapted to have a roller I5 ride thereon, said roller I5 being rotatably mounted to the extended end of lower jaw 68 (see Fig. 16). Lower jaw 68 is made to pivot about an axis I6. When the work carriage I3 travels in the direction of the arrow (Fig. 7) for a predetermined distance, roller I5 will ride on inclined track I4 to cause lower jaw 68 of the grasping device 10 to automatically release the thread T.

In stitching machines of the type described, wherein a looper is employed and where the loose end of the thread is pulled-through the work after the completion of each stitch, it is particularly desirable to provide means to prevent the two strands of the thread cooperating with the needle and the work from becoming intertwined or entangled. Should the thread become entangled the looper or the thread puller would tend to engage both strands of thread, and since one end of the thread is held fixed it would be broken thus causing delay and inefiiciency. To obviate this disadvantage we have devised novel thread holding mechanisms designed to constantly maintain the thread in po- We will first describe the operation of our thread holding mechanism as applied to the needle when said needle is connected to the upper needle bar 50. Then the operation of the mechanism which we employ to hold the thread'when the needle is connected to the lower needle bar 5I 'will'be described.

In Figs. 7 and 8 of the drawings there is disclosed upper needle bar 50 slidably operating in the frame 0, said frame having attachedthereto 76 I to bracket 88 at a point 82. Arm 8| may be held pressed into engagement with needle 52 by suitable means such as an adjustable 'spring- 83. A 7

stop 84 fastened to the frame of the machine is provided to limit the pressure of arm 8| against the needle 52 to prevent breaking of the needle. On the opposite 'side of the needle 52 from that of arm 8| we provide another arm 88, pivotally mounted on the machine casing at 81 and held in engagement with needle 52 by suitable means such as a spring 88. 8| is provided with a cam portion 85 ada ted to cooperate with a projecting lug 89 fixed to needle bar 58.

When the needle bar 58 is in raised position, as

' shown in Fig. 7, arms 8| and 88 serve to maintain the strands of the thread in proper alignment to prevent entanglement. When needle bar 58 moves downwardly a wedge-shaped needle chuck.

98 fixed to the =lower end of needle bar 58 acts so as to move arm 86 away from needle 52 against the action of spring 88 while at the same time lug 89 contacts the cam portion 85 to move arm 8| away from the needle against the action of spring 83. Thus it is seen that arms 8| and 88 are caused to be spread apart to free the thread for effective use to permit the thread to be acted upon by a specially designed looper which will be described in detail as the description proceeds. When needle bar 58 returns upwardly, arms'. 8|

and 86 re-engage the needle 52 to hold the strands of the thread.

Another thread holding mechanism is also provided to hold the strands 'of the thread when the needle'is connected to the lower needle bar Referring to Fig. 3, there is disclosed a cam member 9| fixed to rocker arm 54. Cam member 9| is provided with a slotted portion 92. A link 93 is pivotally connected to the machine casing at a point 94, said link 93 having fixed thereto a pin 95 adapted to engage the slot 92 to cause link 9| to travel in an oscillatory path about pivot 94 whenever rocker arm 54 is moved. A forked member 96 is pivotally attached to link 93 at 91 at one end, and to a link 98 at a point 99. Link 98 is pivoted to the machine casting at I88, as shown in detail in Fig. 10. Forked member 96 has extension arm members which are adapted to straddle and press against the needle 52 at opposite sides thereof to maintain the thread in proper alignment to prevent entanglement.

Cam member 91 is so designed as to maintain the lower thread holding mechanism, as just described, in effective position until such time as the thread is acted upon by a specially designed thread puller, similar to that shown and described in our Patent No. 1,931,447 and which will be discussed more fully as the description proceeds.

To further increase the efiiciency of operation of our stitching machine, we have devised a novel mechanism which we call a looper, the operation of which will now be explained. Referring first to Fig. 7 of the drawings, there is disclosed a looper I85 one end of which is pivotally.

mounted to the machine casingat a point such as I86. Journaled in said machine casing is a shaft I81 (see also Fig. 1) having mounted thereon at one end'a link I88. Said link I88 is connected to looper I85 by means of a link I89 one end of which is pivotally fastened to looper I85 at a point such as II8, the other end being pivotally connected to link I88 at III. Thus it can be seen that when shaft I81 is rotated looper I85 will be caused to oscillateabout pivot I88. The degree and regularity of this oscillation may be governed by rotatably mounting on shaft 4 a roller 2 adapted to ride on a cam 31 and rigidly connected to shaft I81 by a link 5. The contour of cam 31 may be such as to cause looper I85, through the linkage system just described, to oscillate about pivotv I88 at predetermined intervals to engage the loose end of the thread to form a loop. Looper I85 may be caused to pull the loose end of said thread by any suitable hook means such as spoollike projection 6 (see Fig. 3). From the above description of the operation of the looper it becomes apparent that the loose endof the thread T is prevented from becoming entangled and broken when the needle 52 is shifted from the upper needle bar, as in Fig. 7, to be clutched by the lower needle bar as shown in Fig. 10. The mechanism for operating the looper I85 just described is designed to act in cooperative relation with the thread holding means hereinbefore described in connection with the upper needle bar 58.

The mechanism which we employ in our improved apparatus to engage the loops as they are formed from the thread in stitching and to draw or pull out the free end portion of the thread after each stitch may be similar to that shown and described in our Patent No. 1,931,447, hereinbefore mentioned. The operation of the above-described mechanism will be clearly understood Home study .of Figs. 3 and '7 of the drawings in which it is seen that gear 38 is mounted for rotation with pulley 32,. and that when said gear 36 is rotated it causes a thread puller I28 to be carried in a circular patharound the periphery of a stationary grooved drum IN, by means of a chain of gears I22 (Fig. 3), I22, I23 and I24.

The following mechanism may be employed to cause thread puller I28 to travel in its circular path: Gear I24 is so mounted that it is in eccentric relation to the axis of the grooved drum I2I. Fixed to gear I 24 for rotation therewith is an annular plate I24. The thread puller I28 is fixed to the outer end of a carrier arm I25, said carrier. arm being pivoted at its inner end to the drum |2| at a point I28 coincident with the center of said drum I2I. Carrier arm I25 is provided with a longitudinal slot I21 into which a block I28 fixed to the outeer edge of annular disc I24 is adapted to slide. Thus it is seen that when gear I24 is rotated, the thread puller |28.is caused to travel around drum I2I. The mechanism for operating the thread puller as just described is designed to act in cooperative relation with the thread holding means hereinbefore described. in connection with the lower needle bar 5|.

The function of the stationary circular grooved drum I2| is similar to that shown and described in our Patent No. 1,931,447. Briefly stated it is to support the loose portion of the thread on the periphery of said drum |2| after the said thread has been pulled out from the fabric by the thread puller -I28. Figs. 11' and 13 clearly illustrate two steps in this action. Drum I2I may be provided with grooves I29 as shown in Fig. 12, to prevent entanglement of adjacent strands. of the thread while they rest on said I2 I. and into grooves I29, we have devised a novel thread holding means which may comprise a plurotate wheel rality of brushes I held in engagement with grooves I29 of the drum I 2I by means of adjustable springs I3I (see Fig. 9). Brushes I30 are pivotally fastened to the machine casing at suitably positioned points, such as at I32. These brushes I30 serve to hold the thread in its own groove on the drum I2I to prevent sagging and resulting entanglement. The looper I20 is adapted to readily pass through the brushes I30 as it travels in a circumferential path around said drum.

We have also devised a simplified and more efficient mechanism than heretofore employed for intermittently advancing the platform carrying'the fabric to be stitched.

By referring to the drawings, the operation of the above mentioned mechanism will be clearly understood. In Fig. '7 we have disclosed a portion of the work carriage or the traveling platform I3 adapted to travel along any suitable guide means or tracks, such as shown and described in our Patent No. 1,931,447. On the underside of said platform I3 there is provided a toothed rack I35. On a shaft I31 fixed to the machine casing C we mount a gear I36 designed to mesh with .said. rack I35. The means by which gear I36 may be intermittently rotated to intermittently advance the platform I3 may be described as follows: On the shaft I3I we also mount a notched wheel I38 having a series of spaced notches I40 arranged circumferentially of said wheel I38. Mounted for rotation with gear I22 is a cam member I4I having an extended portion I42 adapted to cooperate with slots I40. Cam member MI is so designed that with each revolutionthereof the extended portion I42 will successivelyengage a slot I40 to I38 a predetermined amount. Wheel I38 will then rotate shaft I31 and gear I36 mounted thereon to advance platform I3 a predetermined distance in the direction shown by the arrow. Gear I22 is mounted on the same shaft as gear I22 and rotates therewith. Gear I 22 is driven by gear 36 which in turn is fixed to the pulley 32 for rotation therewith. The mechanism just described is so designed as to cause platform 13 to travel a predetermined amount after each stitch.

It is well known by those familiar with the art that the needle employed in machines of the type described must be occasionally changed for various-reasons. It is desirable, therefore, that this be done as quickly as possible. To facilitate the quick removal and replacement of the needle, we have devised a mechanism which will now be described. Referring first. to Fig. 5, we have shown an enlarged view in sect-ion of the mechanism of the upper needle bar to which is screwed at its lower end a tapered chuck 90. Within the hollowed interior of chuck 90 we provide three balls B (see Fig. 6) arranged so as to permit needle 52 to be inserted between them and held thereby. When the balls B are pressed downwardly the tapered portion of chuck 90 forces them together to grip the needle 52.

Thisdownward pressure is applied by means of a spring I50 pressing against a shank I5I whichin turn presses on the ball B. The upper end of said spring I50 abuts against a member I52 screwedinto the top portion of needle bar 50.

The upper end of" shank I5I extends through.

-ing the rotation of pulley 32. hand wheel 39 is rotated in a counter clockwise description that when the stop I53 is raised in the direction of the arrow while needle bar 50 is held stationary, it will carry with it shank ISI. This will act so as to release the pressure on balls B to allow the needle 52 to be easily removed and replaced. Any suitable means for raising the stop I53 may be employed, such as a forked handle I55 (Figs. 7 and 8) pivotally mounted in a frame I56 fixed to themachine casing C. When handle I55 is pressed downwardly the lower forked end of said handle will engage the underside of stop I 53 to raise the same and thereby release needle 52 in the manner just described- It has been found in the course of the operation of stitching machines of the character described where the upper and lower needle bars are in aligim'ient that occasionally the thread would be found to overlie the hole of the lower chuck so that when the needle travels downwardly to be grasped by the lower chuck it is apt to pierce the thread which interrupts its path, to break said thread. This obviously causes a delay inasmuch as it then becomes necessary for the operator to stop the machine and rethread the needle and start all over again.

- chuck 90' but will tend to slide down to either side due to the pointed construction as well as the positioning of the needle hole. 7

When operating machines of the character described by power means, such as a motor, it has been found desirable at times for certain reasons such as making trial stitches, to operate the machine by hand. The means by which we accomplish this in connection with our apparatus may be described as follows: Positioned within the central portion of pulley 32 is a clutch mechanism I60 shown in detail in Fig. 4. This mechanism operates on a principle similar to that used in free wheeling devices. A disc member I63 of the clutch I60 is rigidly attached to a collar I6I which idles on shaft 33. A plurality of spaced notched portions I62 are cut out of the circumference of disc I63. Into these notches are fitted rollers I 64. It will be noted that disc I63 is of lesser diameter than the interior opening in pulley 32, thus permitting said disc I63 to rotate freely within the pulley 32. Fastened to the disc portion I63 of the clutch I60 at one end is a hand wheel 39 as shown in Fig. 3, adapted to rotate with said disc I63.

It will be seen from the above described construction that whenever the hand wheel 39 is rotated in a clockwise direction as indicated by the arrows in Figures 3 and 4, the rollers I64 will be held in notched portions I62 and disc I63 will be permitted to rotate freely without affect- However, when the direction opposite to that shown by the arrows in Figures 3 and 4, rollers I64 will then be freed from the notched portions I62 to engage the inner surface of pulley 32 to lock disc I63 to said pulley for rotation therewith. Thus it is seen that whenever it is desired to operate the stitching machine by hand, it is merely necessary to turn the hand wheeel in a direction opposite to that shown by the arrows in Figures 3 and 4 and in so doing; the machine will operate similarly to that of the operation when power means is used.

Should it be desired to operate our apparatus automatically, we have provided an automatic switching mechanism adapted to close a circuit to start the motor when a'lever mechanism is tripped and to cause said circuit to be broken to stop the apparatus when the work platform has traveled a predetermined distance.

In Fig. 18 we have shown a wiring diagram illustrating one means for accomplishing this result. When lever I10 is turned in the direction of the arrow B, a catch mechanism I'll is tripped to close the contacts I12 of the switch S by means of a spring R in order to complete a circuit from a source of current supply through the motor M which is energized to cause platform I3 to travel in the direction of arrow A. Fastened to platform 13 and traveling therewith is a projecting lug I13 adapted to strike againsta projecting portion S of switch S. Lug I13 may be positioned at'a predetermined distance from the projecting portion of switch 8', such for example as is necessary for the complete stitching of a tie. When lug I13 strikes projecting portion of switch S, contacts I12 are opened against the action of the spring R to'break the circuit and stop motor M. The lever I may then be made to reengage catch ill to hold contacts I12 open until it is desired to operate the machine to stitch another tie.

It will thus be seen that there is provided a device in which the several objects of this invention are achieved, and which is well adapted to meet the conditions of practical use.

As various possible embodiments might be made of the above invention, and as various changes might be made in the embodiment set forth, it is to be understood that all matter herein set forth or shown in the accompanying drawings, is to be interpreted as illustrative and not in a limiting sense.

We claim: l

1. In a sewing machine, the combination of alternately operating needle bars, a support for said needle bars, a needle, means to alternately connect the needle with each needle bar, means for threading the needle, said last named means being mounted directly on one of said needle bars for movement therewith, means for securing one end of a thread for the needle, and means whereby said needle threading means actuates. said thread securing means.

2. In a sewing machine, the combination of a needle, a needle bar cooperating with said needle, a support for said needle bar, means for threading the needle, said last named means being mounted directly on said needle bar for movement therewith, means forsecuring one end of a thread for the needle; and means whereby said needle threading means is caused to actuate said thread securing means.

3. In a sewing machine, the combination of a needle, a needle bar cooperating with said' needle, a support for said needle bar, means for threading the needle, means forsecuring one end of a thread for the needle, a traveling work supportingv platform, means wherebysaid needle threading means is caused to actuate said thread securing:

means to secure said thread, and means whereby said thread securing means is actuated to release said secured thread after said platform has curing one end of a thread for the needle, 9. traveling work supporting platform, means whereby said needle threading means is caused to actuate said thread securing means to secure said thread, and means whereby said thread securing means is actuated to release said secured thread after said platform has traveled a predetermined distance, said last named means being supported onsaid platform.

5. In a sewing machine, the combination of a needle, a frame, a needle bar mounted on said frame and adapted to cooperate with said needle','said needle bar having a shoulder adjacent its upper end, manually manipulatable means associated with one of said needle bars for quickly disconnecting the needle from said needle bar comprising a handle pivotally mdunted on said frame adapted to engage the underside of said shoulder of said needle bar to raise the same, and means whereby said needle is caused to be released when said needle bar is raised by said handle.

6. In a sewingmachine, the combination of alternately operating needle bars, a support for said needle bars, a needle, means to alternately connect the needle with each needle bar, a thread threaded through said needle and having one end secured and the other end free, said needle and needle bars adapted to form successive loops in the thread, a puller for engaging said successive loops away from the needle and pulling out the free portion of the thread, means for driving said secured and the other end free, said needle and needle-bars adapted to form successive loops in the thread, a puller for engaging said successive loops away from the needle and pulling out the free portionof the thread, means for driving said puller, a stationary drum cooperating with said puller and adapted to receive said free portion of the thread thereon to prevent entanglement of said free end of thread, and means cooperating with said drum to hold said free end thread portions thereon, said last named means comprising a brush adapted to be held in resilient engagement with the periphery of said drum.

8. In a sewing machine, the combination of alternately operating needle bars, a support for said needle bars, a needle, means to alternately connect the needle with each needle bar, a thread threaded through said needle and having one end.

the thread, a puller for engaging said successive loops away from the needle and pulling out the free portions of the thread, means for driving said puller, a stationary drum cooperating with said puller and adapted to receive said free portion of the "thread thereon to prevent entanglement of said free end of thread, and means cooperating with said drum to hold said free end thread portions thereon, said last named means comprising a brush adapted to be held in resilient engagement with the periphery of said drum, said drum being provided grooves.

9. In a sewing machine, the combination of alternately operating needle bars, a support for said needle bars, a needle, means to alternately.

connect the needle with each needle bar, a traveling work supporting platform, means timed with the alternately operating bars for intermittently advancing the platform, said means comprising a gear rack mounted on said platform, a gear cooperating with said rack, said gear being mounted on a shaft for rotation therewith, a wheel having a plurality of notches arranged circumierentially thereof and mounted on said shaft for rotation therewith, and means for successively engaging said notches to cause said wheel to rotate inter mittently.

10. In a sewing machine, the combination of l alternately operating upper and lower needle bars. a support for said needle bars, a needle, means to alternately connect the needle with each needle bar, a thread associated with said needle, each of said needle bars being provided with a substantially cone shaped chuck having a hole therein adapted to permit the needle to enter to be connected thereto, said upper and lower needle bar holes being in alignment, the hole in said lower needle bar being eccentric with respect to the apex of said cone whereby said needle is adapted to travel from said upper needle bar to said lower needle bar without piercing said thread to break the c 2,213,965 with circumferential 11. In a sewing machine adapted to sew threads of predetermined length, the combination of alternately operating needle bars, a support for said needle bars, a needle, means to alternately connect the needle with each needle bar, and

means for threading the needle, said last named means comprising a rigid member having one end thereof pivotally mounted on one of said needle bar and having the free with a.- hook adapted to pierce the eye of the needle, the radius of pivotal movement of said hook portion being substantially equal to the distance between the pivotal axis of said member and the eye of the needle.

one end thereof and adapted upon pivotal move-- ment of said pivotally mounted member to slidably move said spring pressed member against the action of its spring.

end thereof provided CERTIFICATE OF CORRECTION.- Patent No 2,215,965. September 10, 191m.

RUDOLF. NAFTALI, ET AL.

It is hereby certified that error appears in the printed epecification' of the above numbered patent requiring correctionas'follows: Page 6, sec bnd column, line 9, claim 11 for the word "bar" read bars--; line 20,

claim 12-, before "relative" insert ----movable-'-; and that the said Letters Patent shouldbe reed with this correction therein that" the same may confem to the record of the case in the Patent Office. v [si ned end. eealed. this 5th day of November, A. 1). 191m.

Henry Van Arsdale,

Acting Commiesioner of Patents. (Seal)

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