USRE21645E - Double chain stitch sewing machine - Google Patents

Description

3,1940. V I B.I HENRY' I lie-21,645.

DOUBLBCHAIN STITCH SEWING MACHINE Original Filed Oct. 18. 1934 5 Sheets-Sheet l NVE NTOR Dec. 3, 1940.

- a. L. H ENR Y DOUBLE CHAIN STITCH SEWING MACHINE Original Filed Oct. 18, 1954 5 Sheets-Sheet 2' I I l QINVENTOR Anonks II /ll Dec. 3, 1940. B. HENRY 21,545

DO UBLE CHAIN STITCH S BWING MACHI NE Original Filed Oct. 18. 19:54 5 Sheets-Sheet 5 F a. 5. B

\ j l 9 I "I I \m 4 18 [ct TIIVENTOR Dec. 3, B, L HENRY RB. 21,645

DOUBLE CHAIN s'rn'cn SEWING MACHINE Original Filed 0c t. 1 8. 1934 5 Sheets-Sheet 4 v lNvENTzR A RNEYS Dec. 3, 1940.

a. HENRY DOUBLE CHAIN STITCB SEWING MACHINE Original Filed Oct. 18,- 1934 5 Sheets-Sheet 5 INVENTOR M No. N f,

bRNEYs Reissued Dec. 3, 1940,-

q UNITED STATES PATENT oFFic-e DOUBLE CHAIN STITCH SEWING MACHINE Beulah Louise Henry, New York, N. Y.

Original No. 2,037,901, dated April 21, 1936, Se-

rial No. 748,913, October 18.19. Application for reissue June 18, 1938, Serial No. 85,919 I v 28 Claims. (oi. 112-165) This invention relates to sewing machines and more particularly to a sewing machine provided with mechanism for forming a double chain stitch seam.

.The object of the invention is to provide a double chain stitch sewing machine of a novel,

construction capable of forming a double chain stitch seam which will not ravel easily, and which is adapted to be made both on and'ofl the ma.- terial.

Features resulting from the attainment of this object include the provision of mechanism wherein rectilinearly reciprocating needles operating alternately in opposite directions produce the double chain stitch formation and novel loop taking and material feeding mechanism whereby it is possible to project loops of a pair of threads at spaced points alternately upwardly and downwardly through the work, and to stretch each such 26 loop to the next succeeding 'point of projection to be held by the next succeeding loop.

- It is a further object-of the present invention to provide a double chain stitch seam which will have substantially thesame appearance on both sides of the work.

A further object of the invention is to provide a double chain stitch sewing machine'coinprised of a novel and eflicient mechanism which is capable of high speed operation in the formation oi a double chain stitch seam.

This object is accomplished according to the present preferred embodiment of the invention by the provision of sewing mechanism, feeding mechanism, and driving mechanism wherein two successive needle holes are formed and feeding of the work occurs twice upon each onerotation f the main driving mechanism. I

A further feature is the provision.of thread handling instrumentalities which may be located.

close to the presser foot for normal working, and may easily be moved with the presser foot into a raised position clear of the work and work table.

Further objects of the invention will appear 1-1 of Figure 2 looking inthe direction or the arrows;

Figure 4 is a sectional view taken on the line ing the upper needle as it has completed its de- 4-4 of Figure '2 and looking in the direction of the arrows; I

Figure 5 is a sectional view taken. on the lin 55 of Figure 3; Figure 6 is an enlarged sectional view of the up- 5 per portion of the machine, taken on theline 6-0-8 of Figure 5 looking in the direction of the arrows;

Figures 7, 8 and 9 are detail views taken along the line 1-1 of Figure 5 looking in the direction of the arrows;

Figure 10 is a detail plan view of the upper loop hooks forming part of the mechanism of the machine a'nd showing said hooks in their closed position with respect to the needle;

' Figure 11 is a view similar to Figure 10 but indicating said loop hooks in open position;

Figure 12 is a detail sectional view showing the positions of the upper and lower needles of the v machine at the start of their reciprocating movements in forming the double ,chain stitch;

Figure 13 is a view similar to Figure 12 but showing the upper needle in a'more advanced descending position;

. Figure 14 is a view similar to Figure 13 showscending and is beginning its upward movement and the lower loop hooks as they are starting their opening movement;

Figure 15 isaplan view of the loop hooks as theyappear in Figure 14, said view being taken on the line lI-II of Figure 14, looking in the direction of the arrows; I

Figure 16 is a view showing the next step in the formation of the double chain stitch and at the time when the upper needle has started to withdraw upwardly from the work and the lower needle has commenced to move upwardly;

Figure 17 is a view of the lower loop hooks taken 'on the line i'I-il of Figure 16'looking in the direction of the arrows, said hooks being shown in perspective in wide open pontion;

Figure 18 is a view showing the next step in the formation of the double chain stitch and indicatingthe lower needle further advanced upwardly and the, upper needle at the time it has jabout completed its upward movement;

. Figure 19 is a view showing the lower needle at the time it has completed its upward movement Figure '20 is a view showing the lower needle after it has started on its downward movement [and the upper needle again descending;

Figure 21 is a view taken on the line III-2| of Figure 20' looking the direction of the ar- 'ing 2 rising therefrom provided with a laterally extending hollow arm 2 terminating in a head portion 2.

Below the bed plate there is provided the downwardly extending support 51 connected with the hollow casing 52 which encloses certain of the mechanism located at the lower portion -of the machinebelow the bed plate I.

The hollow arm 2 is provided with suitable bearings for supporting the main drive shaft of the machine. The drive shaft 51:: provided with a driving pulley 2 and the hand wheel 1. The driving pulley and hand wheel may be connected with the drive shaft in any suitable manner and the driving pulley may be driven either by a belt indicated at 2, or by any other suitable or usual driving means.

Referring to Figures 1 and 2, the main drive shaft 5 is shown as provided at its left hand end with the cam member 9. The other end of the main drive shaft has mounted thereon agear III which is positioned so that it will mesh with a gear ll mounted on the upper end of a vertical shaft 12. The shaft l2 at its lower end is provided with a gear l2 (see Figure 4) which is positioned so that it will mesh with a gear I2 secured to the right hand end of horizontal shaft l5 located at the lower portion of the machine. The left hand end of shaft I 5 has mounted thereon a cam member l2 which is identical in size and construction with the upper cam member 9 which is secured to the main drive shaft 5.

It win be evident from the above description of the arrangement of the severalshafts that when a rotary movement is imparted to the main .drive shaft 5 said shaft through its gear II will impart a similar rotary movement to the lower horizontal shaft l5 through the vertical shaft l2.

The double chain stitch machine of the present invention employs an upper and lower needle which are caused to have an alternately rectilinearly reciprocating movement in timed relation with each other in eflecting the formation of the double chain stitch. The mechanism for effecting the movements of the upper needle and its associated and cooperating parts will now be described.

The upper needleis indicated at n and issecured by usual means to a needle bar I2. The needle bar is reciprocally mounted in the head portion 2 and has a reciprocal movement immsmpari'iedto it by the following described mecha- Clamped to the needle bar by means of a yoke member I24 is a curved follower l2 (see Figures 5, "I, 8 and 9). The curved follower is engaged by a roller 22 which is rotatably mounted in the end portion of the cam member 9 by means of a pin 2|. When the main drive shaft 5 and cam member 2 are caused to be rotated the roller 22 e suin in the curved follower M will cause the needle bar l2 to have an up and down reciprocating motion imparted to it. The manner in which the reciprocating motion is imparted to the needle bar is clearly indicated in Figures '7, 8

and 9. Referring to Figure 7 it will be seen that ;the roller 22 is shown at thetime when the needle buds in its highest raised position. As the shaft 7 5 andthe cam member '9 are rotated in the direction indicated by the arrow in Figure '1' the roller 20 moves downwardly in the curved follower and forces the needle bar downwardly as indicated in Figure 8. As the shaft 5 and cam member continue to rotate, said roller retraces its movement in said follower and thus continues I to force the needle bar downwardly until the said roller reaches the position in the follower indicated in Figure 9. The continued rotation of shaft 5 and cam member 9 and the retracing movement of the roller in the follower causes said roller to pushthe needle bar upwardly until it reaches its original raised position as indicated in Figure 'l.

Reciprocally mounted in suitable bearings in the head portion 4 of the machine is a hollow presser foot bar 23 provided with the usual type of presser foot device 22 secured at the lower end thereof by means of the screw bolts 22. The presser foot bar at its upper end has secured thereto an outwardly extending pin 25. The pin 25 extends through the side of the head portion 2 and its end is positioned so that it will engage with a cam member rotatably secured to the head portion as at 21 and which is adapted to be rotated by means of the handle 22. When the cam member is rotated the pin 25 rides over the'cam surface of the cam member and causes said presser foot bar to be raised and lowered out of and into operative position with respect able bearings in the upper part of the head portion 2. The sleeve 2| is formed with a sliding joint indicated at 22 and which is so positioned that it will permit the presser foot bar to be shifted up and down and to raise and lower the lower endof said sleeve. The solid shaft 22 is also provided with a sliding Joint so that the lower end thereof may be shifted up and down with the presser foot bar.

Fixedly secured to the lower end of the hollow sleeve,2l is one upper loop hook-22 of the machine. Secured to the lower end of solid shaft 22 is the second upper loop hook 22a.

At the upper ends of sleeve 2| and shaft 22 there is clamped thereto the forked levers 25 and 22. The levers 25 and 22 are connected to a lever 22 bymeans of the links 21 and 22. 'Lever 29 is pivotally mounted by means of a pin 22 between two lugs in the head portion 2 of the machine and is provided with a roller 2| which is positioned so that it eng es in the cam race 22 formed in the-cam member 9. The cam race 22 is so formed that when the cam member 2 is rotated by the drive shaft 2 it will impart to lever 22 such a movement that said lever through links 21 and 22 will move levers 25 and 22 and impart timed rotative movements to sleeve 2| and shaft 22 so that the loop books 22 and 224 will be caused to be opened and closed with respect to each other.

The cam member 2 is also formed with a cam race 22. Cam race 22 is provided to effect the as indicated at 45 and has the roller 41 rotatively mounted in one end thereof. The roller 41 is positioned so that it rides in the cam race 43. The other end of the takeup arm is provided with a guide hook for engaging with the thread 4| fed to the needle H. The thread 44 is fed through the guide 49 (see Figure 2) around tension device 50 and through eyelet in end of lever 44 and thence to the needle. The cam race 43 is so formed that when the cam member I is rotated said cam race will impart a timed rocking motion to the thread takeup arm 44 and the thread will thus be fed to the needle-at timed intervals.-

The mechanism eflecting the movements of the lower needle of the machine and its associated and cooperating devices will now be described.

The mechanism employed for imparting the the case in connection with the upper needlebar I8, is the curved follower 54 (see-Figure 3). Said curved follower is engaged by the roller 55 which is rotatably secured to the end portion of the cam member i8 by means of a pin similar to the manner in which the roller 2|! is secured to cam member 9. When shaft I5 and cam member ii are rotated, the roller 55 which is engaged in'said follower will effect an up and down reciprocation of the needle bar 52 in the same manner as the upper needle bar I! is reciprocated as above de scribed. I

In the casing 56 of the lower portion of the machine there is rotatably mounted in suitable bear,-

ings the hollow sleeve 58 which encloses the rotatably mounted solid shaft 59. Flxedly secured to the upper end of the sleeve 58 is one prong 60 of the lower loop hooks of the machine. Flxedly secured to the upper end of solid shaft 5! is the other prong 6! of the lower loop hooks. The

lower ends of sleeve 58 and shaft 59 have clamped thereto forked levers 62 and 83 which are identical in character with the levers 3i and I! connected to the upper sleeve 3| and shaft I2. Links (not shown) but similar in construction and arrangement to the links 31 and I! connect the levers 62 and 83 with a lever 64. Lever 44 is pivotally mounted at one end in the framework of the lower casing by means of the pin 85 and is also provided with a roller positioned so that it will cooperate in the cam race 81 of the cam member l8. Cam race 81 is so formed that the rotation of the cam head by shaft I! will cause lever 64 through said links and forked levers 62 and C3 to impart a rotative movement to sleeve 58 and shaft 59 at timed intervals so that the loop hooks B0 and SI will open and close.

The lower look hooks 60 and 6| are mounted in a fixed position with respect to the underside of the needle plate la. and are not moved towards and from said needle plate as is the case with re-' spect to the upper loop hooks which are secured to the sleeve and solid shaft mounted in the presser foot bar. In the mechanism positioned below the needle plate is, in place of a presser-foot, there is provided a fabric feeding claw Bl. The feeding claw is formed with aserrated edge portion OI (see Figure 6) which is positioned in the opening III in the needle plate. The feeding claw is provided with an opening ll therein through which the I needles ii and II are adapted to pass as they are reciprocated up and down bythe above described and forth swinging movement'to the shaft Ila thereby reciprocating lever 12 and thus the feeding claw 68 will be caused to be moved back and forth in the opening II in the needle plate la. and the fabric being stitched will thus be progressed along the surface of the said needle plate.

Mechanism is also provided for imparting an up and down movement to the feeding claw so that it will grip and release theunderside of the fabric during its feeding movement of the same. The mechanism' provided for the above mentioned purpose is as follows:

Extending from shaft .1 la, to which the feeding 25 cla'w 08 is secured, is an arm 16 (see Figure 2).

The arm 16 is pivotally secured to a link 11 which in turn is pivotally secured to a lever 18. One end of lever 18 is provided with a roller 18 and the other end is pivotally secured to the framework of. the lower casing of the machine.. Roller I9 is positioned so that it will register and cooperate with a cam 8| mounted on the shaft l5.

when shaft I5 is rotated the cam 8| and roller 19 cause lever-.18 to be rocked, and lever I8 through of the feeding claw 68.

The movements of the mechanism above described for effecting the operation of thefeeding claw are so timed that the upward movement of the feeding claw for making contact with the fabric is effected immediately before said claw starts its forward movement; it starts downward on completion of the forward stroke effecting the disengagement of the claw from said fabric.

The lower cam member i6 is also provided with a second cam race 82. Cooperating with cam race 82 is a roller Q3 pivotally mounted at the end of an arm '84 of a thread takeup lever 85. The thread takeup lever 85 is pivotally mounted by means of the pinv 86 to the framework of the lower casing of the machine and at its other end lower needle. The mechanism for feeding the thread to the lower needlev ii is identical with and is operated identically in the same manner as the mechanism for feeding the thread to' the upper needle l1.

as lever 11 and arm "imparts a rocking motion to shafts I la and thus effects a raising and lowering The means for imparting rotative movements I to shaft 14 will now be described. Referring to Figure 4, it will be noted that a cam 89 is mounted on the main drive shaft 5. said cam being provided with lobes Oil and Si. Co-

operating with said cam is a roller 92 which is rotatively mounted at the end of the curved lever ll. Secured in outstanding lugs on the side face arm 91 the shaft 14 'will have imparted thereto periodic oscillating movements. The shaft 14 by reason of its operation by the mechanism above referred to will in turn effect the back and forward movements of the feeding claw in the opening provided in the needle plate la and thus the fabric being worked upon will be fed along said needle plate. By reason of the two lobes and SI on cam]! there will be provided two feeding movements to the feeding claw for each revolution of the drive shaft and consequently the movements of the material through the machine will be twice as fast as is-the casein the ordinary sewing machine.

Again referring to Fi ure 4, it will be noted that a lever 09 is provided which is pivotally secured to the framework 2 of the machine, as at 00. One end 0941 of lever 00 extends through the casing and the other end is secured to a link I00. The other end of link I00 is pivotally connected to connecting rod 00. By' raising or lowering the end 00a, the rod 00 and its sliding block 95 may be positioned with respect to the rod 94 mounted on lever 00. By adjusting the position of the sliding block 05 with respect to rod 84" variations in the length of the feeding stroke of the feedin claw 00 may be effected and a dliferent length of stitch may be accomplished by the operation of the inachin'e- The manner in which the operation of the needles and the other mechanism of the machine eii'ect the formation of a stitch will now be explained.

Referring to Figure 12, it will be see that when the upper needle II, with its thread 40, is operated so that a downward movement is imparted thereto by the needle bar I 0, it is caused to pierce the fabric and to pass through the opening H in the feeding claw. As the needle continues on its downward movement (see Figure 13) is passes, with its thread, between the lower loop hooks 00 and 4| which up to this point are maintained in their closed position. As the needle I! reaches the position indicated in Figure 13 the mechanism which controls the opening and closing of the lower loop hooks causes said hooks to start their opening movement and to grasp the thread held by the upper needle and to spread the same so as to form a loop. This relation of the loop hooks, upper needle and the thread, is clearly indicatedinl'igure 14. Referringtothisflgureitwill be seen that at this point of the operation the needle I! has started slightly in the direction of its upward movement and there is produced in a loop form a slight slack in the thread and the loop hooks hold the thread in'a partially spread condition. In FigureslG and 17 the upper needle I1 is shown as it has withdrawn further in its upward movement. The lower loop hooks 40 and II are shown as having completed their outward movement and are holding the thread which they havegraspedfmmtheupperneedleinanextended spread condition. At this point, the mechanism which effects the operation of the lower needlell hascausedsaidneedletostartitsupward movement. In Figure 18 the upper needle is shown as having completed its upward movement and the lower needle has been advanced upwardly through the lower loop hooks and the loop held on said hooks. As the lower needle advances upwardly it is to be understood that the a mechanism operating the lower loop hooks has caused said hooks to close and to release the "loop which they have previously held in extended form. This loopnow is drawn tight against the fabric, by the take-up arm 44. In Figure 18 the lower needle is also shown as having advanced upwardly through the opening in the feeding claw and has pierced the fabric. It will be noted also that as the lower needle startsits upward movement and the upper needle has left the fabric the mechanism of the machine which effects the operation of the feeding claw has caused said feeding claw to advance the fabric towards the left so that when the lower needle passes through the loop formed of the upper thread and held by the lower loop hooks, the new loop formed by the lower needle will pierce the fabric in advance of the preceding loop. v

'As the lower needle continues upwardly it passes between the upper loop hooks 33 and 34 which at that time commence their opening. movement so as to hold the loop of the thread of the lower neede in an extended spread condition. In Figure 19 there is indicated the position of the lower needle and the loop hooks at the instant when the lower needle starts its receding or downward movement and when the upper loop hoolm start their opening movement. In Figure 2d the lower needle is indicated as it has receded below the needle plateand through the opening in the feeding claw with its looped thread held in a spread "condition by the upper loop hooks (see Figure 21). In these last mentioned two figures the upper needle is also shown again starting its downward movement and about to pass through the spread loop held by the upper loop hooks. As the upper needle approaches the fabric on the needle plate, the mechanism of the machine which operates the feeding claw again functions and causessaid feeding claw to advance the fabric so that the upper needle will pierce the fabric "at an advanced point therein. In Figure 22 the upper needleis shown as having passed through the spread loop and carrying the same with it and the upper loop hooks are shown as partially closed. This figure also indicates the advanced fabric with several stitches produced therein by the action of the needles and loop hooks.

The type of double chain stitches formed by the operation of the needles and loop hooks as above described is indicated. clearly in Figure 23. In said figure the upper thread is indicated by the letter A and the lower thread by the letter B.

It is-to be understood that the reciprocating movements of the upper and lower needles are effected by their operating mechanisms so that said needles will operate in timed relation with each other and with the opening and closing of the loop hooks. Also the mechanisms for eflecting the operation of the feeding claw is so constructed and arranged that said feeding claw will raise and lower from the fabric and feed the same along the needle plate in timed relation with the movements of the needles.

Y a double chain stitch sewing machine made sewing machines.

machine constructed and operating in the manner herein described it is possible to use smaller sizes of thread without danger of breaking because less strain is imposed thereon by reason of the short length of the loops produced by the sewing operations.

Having now set forth the nature of the invention, what I claim herein is:

1. In a sewing machine, the combination of a work supporting surface, means for feeding work along. said supporting surface, thread carrying needles positioned to vertically project their.

thread through work on said work supporting surface and from either side thereof, means for alternately effecting the operations of said needles, expansible means for holding said thread projected through said work by said needles and for extending the same into a loop form \mtil a new thread is projected therethrough by one of the needles on its thread projecting stroke, means for operating said expansible thread holding and loop extending means, and means for operating said work feeding means in timed relation to the thread projecting movements of said needles.

2. In a sewing machine, the combination of a work supporting plate, means for feeding work along said plate, means for effecting the operation of said work feeding means so that it will advance the work along said plate predetermined distances, thread carrying needles positioned to vertically project thread loops through the work and from opposite. sides thereof, means for alternately operating said needles. expansible devices for holding and extending said loops of thread projected through the work by said needles- ,until another loop of thread is projected through the same by one of the needles, means for effecting the expansion of said loop holding and extending means in timed relation to the loop projecting strokes of said needles, and means for regulating the length of feed of'said work by said work feeding means.

3. In a sewing machine, the combination of a work supporting plate, means for feeding work' along said plate, a presser foot positioned above said work plate and adapted to hold said work in feeding position on said plate, means for raising and lowering said presser foot into and out of operative pomtion with respect to said work,

tbreadcarryingneedlespositionedsosstobe adaptedtovertically projectthreadloops through work on said work plate and from either side thereof, means for operating said needles in timed relation with each other so that they will alternately project their thread loops through the work, cooperating relatively separable members for receiving. holding and extendin said loops of thread projected through said work by said needlesuntil anotherloopofthreadhasbeen projected therethrough byone of said needles on another thread projecting stroke, means'for effecting the relative separation ofsaid loop extending members and in timed relation'to the loop'projectingstrokesofsaidneedleaandmeans Furthermore, by utilizing a for causing saidworkfeedingmeanstofeedthe work along said work supporting plate at predetermined intervals.

4. In a sewing machine, the combination of a work supporting plate, means for feeding work along said work plate, means for causing said work feeding means to feed work along said plate at predetermined intervals and for predetermined distances, thread carrying needles positioned to vertically'project thread loops through the work on said work plate and from either side thereof, operating means for said needles adapted to effect alternate operation thereof, means for effecting a uniform feeding of thread to said-needles and at timed intervals, expansible devices for receiving, holding and extending the loops of thread projected through the work by said needles until another loop of thread has been projected therethrough by said needles, means for effecting the expansion of said loop holding and extending devices so that they will operate in timed relation to the loop projecting strokes of said needles and to the feeding movement of said work feeding means. i

5. In a sewing machine, the combination of a work plate supporting surface, means for feeding work along said work plate, means for causing said work feeding means to feed work, along said work plate, predetermined distances, thread carrying needles positioned above and below'said work plate, means for causing said needles to work plate supporting surface, means for feeding work along said work plate, two vertically reciprocating thread carrying needles each positioned to project their threads through the work on said work plate and from opposite sides thereof, means for reciprocating said needles in timed relation to each other, expansible devices for extending the loops of thread projected through the work by each of said needles until the other needle projects a new loop of thread through said work and through said extended loop,'means for expanding said loop extending devices in timed relation to the reciprocating movements,

of the needles, and means for operating said work feeding means to advance the work between needle strokes.

7. Ina sewing machine, the combination of a work plate supporting surface, means for feeding work along said work plate, a pair of vertically reciprocating thread carrying needles one of which is positioned to project its thread through the work on said work plate from one side thereof and the other needle being positioned to project its thread through the work from the other side of said work plate, means for operat ing said needles sothat their-reciprocating movements will be in timed relation to each other, relatively movable hook devices for extending and holding the loops of thread projected through the work by each of said needles until the other needle projects a new loop of thread through the work and through said extended loop on its projecting stroke, means for operating said loop .lo' plate for'projecting loops of thread through the.

meeting movements of the needlesmeans for operating said work feedingmeans, to advance the work on said work plate, predetermined'distances,- between the strokes of said needles, and

1 means .for regulating the distance said work is advanced by said feeding means.

8. In a sewing machine, a work plate support ing surface, means'positioned above the 'work plate for. projecting loops of thread through the work on said plate, means positioned below the work, means for actuating-said thread loop projecting means alternately and intimed relation with each other, relatively movable hook members for extending and holding the loops projected through the work by the loop projecting means so that the alternately actuated loop projecting means will pass through the said loops on their loop projecting strokes and means to relatively move said hookmembers in timed relation with respect to said-loop projecting means.

9; In a sewing machine, a work plate supporting surface, means positioned above the work a plate for'projecting loops of thread through the work on said plate, means positioned below the plate forprojecting-loops of thread through the work, means for actuating said thread loop projecting means alternately and in timed relation with each other, relatively separable members for extending and holding the loops projected through the work by the loop projecting means so that the alternately actuated loop projecting means will pass through the said loops on their loop projecting strokes, and means for rela-' and for feeding the work along the work-plate in timed relation with the projecting movements vof said needles.

10. In' a sewing machine, the combination of positioned above the work plate and in such manner that the said needles will pass therebetween when they are actuated, a pair of loop hooks positioned below the work plate and in such mannerthatthesaidneedleswillpasstherebetween when they are actuated, means for actu sting one pair of said loop hooks at time intervals so that said hooks will engage loops of thread projected through the work by one of said needles and cause saidloops to be extaided so that the other needle will pass therethrough as it projects its thread through the work, and means for actuating the other pair of loop books at timed intervals so that said books will engage loops of thread projected through the work by. the other of said needles and extend the same so that the first mentioned needle will pass therethrough as it is actuated.

11. In a sewing machine, the combination of a work plate supporting surface, a thread carrying needle positioned to operate from one side of the work, a second thread carrying needle positioned to operate from the other side of the work, means for actuating said needles in timed relation with each other to project loops of their thread through the work, a pair of loop hooks positioned above the work plate and in such manner that the said needles will pass therebetween 1. when the? are actuated. a Pill of loop hooks 90- sitloned below the'work plate and in such manner that the said needles will pass therebetween when they are actuated,'means for actuating one pair of said loop hooks at timed intervals so that said hooks will engage loops of thread projected through the work by one of said needles and cause said loops to be extended so that the other needle will pass therethrough as it projects its the operation of said feeding means in timed re-\ lation with the movements-of said needles.

1 2. In. a-sewing'machine', the combination of a work plate supporting surface, a thread carrying needle positioned to operate from one side of the work, a second threadcarrying needle positioned.

to operate from the other side of the work, means for actuating said needles alternately with respect to each other to project loops of their thread through the work on said work plate, loop, hooks positioned above the work plate, loop hooks positioned below the work plate, means for actuating the upper loop hooks in timed relation with the movements of the lower needle so that said hooks will engage the loops of thread projected I through the work by said needle and hold said loops in an extended condition as the said needle withdraws below the work plate and so that the tively separating said loop extending members,

upper needle will pass therethrough, means for actuating the lower loop hooks in timed relation with the movements of the upper. needle so that said hooks will engage the loops of thread projected through the work by said upper needle and hold said loops in an extended condition as the needle withdraws above the needle plate and sothe lower needle will pass therethrough on its next upward thread projecting movement, and feeding me'ans acting to advance the work between needle strokes in timed relation with the movements of said needles and loop hooks.

13. In a sewing-machine, a .work plate supporting surface, a thread carrying needle positioned to operate from one side of the work, a second thread carrying needle positioned to operate from the other side of the work, means actuated by the main drive shaft of the machine for operating said needles alternately and in timed relation with each other to project loops of their thread through the work, expansible devices positioned on eitherside of said work plate for grasping the loop of thread alternately projected through the work by said needles and to extend the same so that said needles on their next succeeding projecting stroke will pass therethrough, means for advancing the work along the work plate in timed relation with the movements of the needles and the loop extending devices and means actuated by the main drive shaft for effecting the operation of the work advancing means.

14. In a sewing machine, a work plate supporting surface, a thread carrying needle and driving connections actuating the same to project loops of threads through the work from one side thereof, 2 second thread carrying needle and driving connections actuating the same to project loops of said needle's thread through the work from the other side thereof, expansible loop spreading means and means to expand the same to engage loops of thread projected through the work by the first mentioned needle and to extend said loops of thread for the other needle to pass therethrough, a second expansible loop spreading means and means to expand the same to engage 6 loops of thread projected through the work by the second mentioned needle for the first needle to pass therethrough, a presser device for holding the work on said work plate supporting surface, and means for advancing the work along the work plate and actuating means for effecting:

the operation of the work feeding means in timed relation to the movements of the thread carrying needles. I

l5. In a sewing machine, the combination of a work plate supporting surface, a thread carrying needle positioned above said work plate and adapted to have a vertical reciprocating movement through the work plate, a second thread carrying needle positioned below the work plate and adapted to have a vertical reciprocating movement through the work plate, .rneans for imparting alternate reciprocating movements to said needles to cause them to project loops of'their thread through the work on said work plate, relatively movable devices positioned above said work plate for graspingand spreading the loops. of thread projected through the work by the 'lower needle, relatively movable devices positioned below said work plate for grasping and spreading the loops of thread projected. through the work by the upper needle, means for effecting relative movement of each set of said loop spreading 'devices in timed relation with the reciprocating said needles will be held extended for thei other needle to pass therethrough during its thread projecting stroke and feeding means for advancing' the work along said work plate and means 40 for actuating the same between the strokesof other needle to pass therethrough during its next thread projecting stroke, means for effecting the expansion and contraction of said loop engaging 55 means in timed relation to the operation of said needles, means for feeding thread to'said needies at timed intervals, and means for advancing work along the work plate in timed relation I tothe projecting strokes of said needlea: t 60 '17. In a sewing machine, in combination, -a

main drive shaft, a work plate supporting surr fact, a reciprocating thread carrying needle.po.-'

sitioned above said; work plateand adapted to be reciprocated therethrough, a reciprocating, (:5 thread carrying needle positioned-below said work plate and adapted tobe reciprocated therethrough, means on said. main drive shaft-for effecting the reciprocating movement of the upper thread carrying needle, means actuated by. I 70 the main drive shaft for eflecting the reciprocat-.-

ingmovement .of the lower threadicarryins needle in alternate and timed relation to the reciproq. eating ,movement of upper ;need1e,;a i0op, I spreading means positioned abovesaid work'plate 75 and in'the path of the reciprocating movement movement of said needles and so that loops of thread projected through thework by each of of said needles, a loop spreading means positioned below said work plate and also in the path of the reciprocating movement of said needles, means on said main drive shaft'for effecting theoperation of said upper loop spread- 5 ing means so that it will operate in timed relation with said needles to effect a spreading of n the loops projected through the work by the lower needle and so said loops will be held extended for the upper needle to pass therethrough 10 on its thread projecting strokes, means actuated by the main drive shaft for eflecting the operation of the said lower loop spreading means so that itwill operate in timed relation withvsaid needles to effect a'spreading of the loops projected l8 through thework by the upper needle and to hold said loops extended for the lower needle to pass therethrough on itsthread projecting strokes,-feeding means for advancing the work along said work-plate, and means driven by the 20 main drive shaft-foreflecting the operation of the work feeding means intim'ed relation to the reciprocating movements of said needles, and means for regulating the length of feed of said work by said feeding means. 25

'18. Inna sewing machine, incombinatiom-a main drive shaft, a workisupporting plate, a

vertically reciprocating thread carrying a needle positioned above said work supporting plate and adapted to be reciprocated therethrough, a vertically reciprocating, thread carrying needle positioned below said work supporting plate and adapted to be reciprocated therethrough, a cam member on saidmain drive shaft for effecting the reciprocating movement of the upper thread carrying needle, a similar cam member on another drive shaft for effecting reciprocating movement of the lower thread'carrying needle aite'rnately andiin timed relation to the move,-

,ments of the upper needle, means cooperating 4 with the main drive shaft for effecting the movements of the second mentioned cam shaft, 9. pair of loop hookspositioned above said work plate and inthe pathof the reciprocating strokes of said needles, =-a pair of loop hookspositioned below said work plate and also positioned-in the path of the reciprocating movement of .said needles, means actuated by the cam member on the main drive shaft and means a'ctuated by. the

cam member on the other mentioned drive shaft for effecting the operation of said upper and lower pairs of. loop hooks in'timed relation with the reciprocating movements 'of said needles so that they will operateto hold' and spread the loopsof thread projected through the work by said needles andmaintain. the same in a spread condition until the next-projecting stroke of said needles projects a new loop therethrough, means operated by said cam members to tension and feedthe threadto said needles at. predetermined m times; a presserfoot .device foryieldingly maintainlng the work'on said work supporting plate,- means forlifting and lowering said vpresser foot device and the-upper pair of loop hooks out of and into operating position-with respect to the- 05 work supportingrplate, means for feeding said;

work along said plate and operating means for said work feeding means to effect the movement thereof in timed relation to the reciprocating movements of said 'needlesgand-means for regu- 7o lating-the length ofmovement imparted to said work bysaid work feeding means.

19. In a, sewing i machine, in combination, a main drive shaft, avwork. supporting plate, means forfeedingwork along saidplate, a vertically re- 7 ciprocating needle positioned above said work p in adapted to bereciprocated therethrough, a second vertically reciprocatingneedlepositionedbelowaaid work plate' and adapted'to' be reciprocateda pair oi loop hooks positioned above said work piateandadaptedto engsgeloops proiected throughthewm'kbythelowerneedlaapairot loopbookspositionedbel'owsaidworkplateand adapted to engage loops Pr jected through the workbytheupperneedle,athreadtensionand feeding 118M101" and feeding thread tothe upper needle, athreadtensioning and feeding device for tensioning and ieeding'thread to the lower needle. -a presser device for yieldingly maintaining saidwork on said work supporting plate, means secured tosaid main drive shaft and, operating therewith for eiiecting the reciprocation oi the upper needle and the opening and closing oisaidupper loop hooks, means driven by the main drive shaiti'or eiiecting the reciprocationoi the lower needle and'the opening and closing oi the lower loop hooks, means for actuating the said operating means for the upper and lower needles andthe upper and lower loop'hooks in timed relation with each other so that said needles and hooks will eiiect the production or a series of running lock stitches through the work on said work plate, and means actuated 30 by the main drive shaft for operating said work ieedingmeanssothatsaidworkisadvancedaiong said plate between the'strokes of said needles predetermined distances.

20. Inasewingmachinethecombination'ota work plate: feeding mechanism; sewing mechanism,includinganupperandalowerthread carrying needle; upper and lower loop holding means, each disposed respectively and completely above and below the work plate; a rotatable main driving mechanism; and driving means, for operating said feeding mechanism twice, alternately prolectingsaidupv rneedle and said lower needle each once into and out of the work on the plate,

"andoperatingsaidupperandlowerloopholding' meanseach onoe,upon eachsingle rotation of the '21. Inasewingmachinethecombinationoia work plate; work feeding means: mecha-- through; and driving means for operating the last named means-thread projecting means, thread holding means. and work feeding means concurrently.

28.1nasewing machinathecombination o!- a work plate; work feeding means; means positioned above andbelowtheworkplate for projectingloopsoithreadthroughtheworkzmeans for holding threadprojected downwardlythrough thework until anew threadloopisprojected therethrough; a presser bar; means supported bysaidpres'serbariorholdingsaidthreadmoved upwardly through the work by said projected named means, thread projecting means, thread 'means1mtilaneWthreadlsprojectedtherethrough: driving means for operating the last currently; and a connection permitting arise and tall movement of said last named means withsaidpresserrodtoallowsaidthreadholdin: means to be moved toward and from said work support.

24. In a sewing machine, the combination of a work plate: work i'eeding means;- means positionedabove the work plate for projecting loops '0! thread through the work on said plate; means positioned below the plate ior projecting loops oithreadthroughthework:meanstoractuating said thread loop projecting means alternately andin timed relation with each other; a pair of sleeves; arodineachoisa'id sleeves; ahook on each of said rods and said sleeves adapted to hold said thread moved through said work by said thread projecting means until anew thread'is projected therethrough; andmeans i'or operating said thread prolecflngmeans, rods,

sleeves. hooks and the work ieeding means con- 25. In a sewing machine, the combination of a work plate; ieeding mechanism; sewing mechwork plate adapted to form upwardly and d wardly pierced holes and to project alternate upwardly and downwardly extending loops or thread through said holes; means for feeding the work each time after said means forms each upwardly and each downwardly pierced hole; means for holding and laying such loops from the hole throughwhich they are projected to the succeeding hole to be held by the thread Jectlng means each time one hole and one loop 5 is formed concurrently.

3m LOUISE HENRY.

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