US1622414A

US1622414A - Felling machine

Info

Publication number: US1622414A
Application number: US628970A
Authority: US
Inventors: Maurice D Brody
Original assignee: Individual
Current assignee: Individual
Priority date: 1923-03-31
Filing date: 1923-03-31
Publication date: 1927-03-29
Anticipated expiration: 1944-03-29

Description

1 622,414 March 29, 1927. M. D. BRODY FELLING MACHINE Filed March 31, 1923 6 Sheets-Sheet 1 NW M l/VVENTOR I A TYI'ORA E y 1 March 29 927 M, D. BRODY FELLING MACHINE 6 Sheets-Sheet 2 Filed March 31, 1923 l/VlE/VTOR A TTIORA E Y March 29 1927. l ,6Z2,414

M. D. BRODY FELLING MACHINE Filed March 31, 1923 I 6 She'et s-Sheet 3- INVENTOR Nm/r/ceDDrad A T TOR/V15 Y 1,622,414 March 9 M. D. BRODY FELLING MACHINE Filed March 31, 1925 6 Sheets-Sheet 4 O IIIIII IIIIII amnmlyM \w A TTOR/VEY 1 622 414 March 29, 1927. M. D. BRODY FELLING MACHINE Filed March 51, 1923 6 Sheets-Sheet 5 INVENTOR. //0' urlcefl Brad A TTORNEYS.

March 29 1927. M D- BRODY I FELLING MACHINE Filed March 51, 1923 6 Sheets-Sheet 6 INVENTOR Na arms 0. brody.

A TTORNE Y Patented Mar. 29 1927.

UNITED STATES PATENT OFFICE.- I

FELLING MACHINE.

Applieation filed March 31, 1923. Serial No. 628,970.

-My invention relates to an improved form of felling machine by which two layers of fabric may be sewed together by means of stitches contained wholly between the outer surfaces of the layers of fabric and without the stitches being visible on the outer surface of either layer of fabric. It is well known in the art, and particularly in connection with garment making that there are places requiring the sewing together of layers of fabric, commonly known as the felling operation, where the garment cannot be turned so that the sewing is on the wrong'side, and where the sewing must be effected with the layers of fabric in the relation they occupy in the finished garment. Also, for example,

in sewing the lower ends of the sleeve linings in place in a coat,"it is usually the case that the other sewing on the coat and lining has been done prior to securing the ends of the sleeve lining to the ends of the coat sleeves. It is therefore necessary in sewing the coat sleeves to the lower ends of the'sleeve lining to tuck in the fabric of the coat and also the fabric of the lining and then sew these layers of fabric together in the position and relation that they occupy in the finished garment. This sewing operation has commonly been effected heretofore by hand and is objectionable for the reason that the stitches are necessarily visible to some degree, some- "ing of the stitching. The felling machine.

what irregular due to the hand operation, costly because hand labor is employed, and not permanent because breaking the hand stitching at any point permits ready ravelcomprisingmy present inventionis adapted to perform the sewing operations just referred to and any sim lar operations, without displacing the layers of fabric from their final relation in the finished garment,

by means of blind, locked stitches. In stitch-' ing the layers of fabric together, the stitches are formed alternately through a; first one of the layers of fabric and then through the other of said layers in zigzag fashion and in a manner such that no. stitch projects I through the outer surface of the fabric, fur- -thermore the needle operates between the layers of fabric and in.a plane lying wholly within the outer surface of the layers of-the fabric and at a sufficient distance from the adjacent edges of the fabric to wholly con-' ceal' the stitches. after they. are formed, the

stitches being as near or far from the edges of the layers of fabric as desired. In this manner the sewing is not only what may properly be called blind stitching, but in addit on each stitch is made to pass through a desired and predetermined amount of the thickness of each layer of fabric, which amounts may differ for the two layers sewed togetherby the operation. It will further be observed from the following description of my inventlon, that my machine employs two threads and that each stitch is a true lock stitch as a result of which the layers of fabric are securely held together and furthermore that the stitching is wholly Within the outer edges of the fabric and entirely concealed between the layers of fabric.

My invention will best be understood by reference to the accompanying drawing showing a preferred embodiment thereof in which- Fig. 1 is a view of the complete machine in side elevation, a part of the bed being broken away to more clearly show some of the operating parts,

Fig. 2 is a top view of the partsshown in Fig. 1 with a part of the bed broken away to show the bottom operating shaft and with the cap carried by the outer end of the arm removed to show the gearing there located,

Fig. 3 is a left hand elevation of the parts shown in Fig. 1 with a part of the lower operating mechanism broken away to more clearly show the feed cam,

Fig. 4 is a detail view to an enlarged scale showing the lower cam and the feeding mechanism,

Fig. 5 is a vertical longitudinal sectional view through the machine showing the lower operating shaft and the parts driven thereby and alsothe detail of the needle bar construction and its operating means, taken along the line 55 in Fig. 2,

Fig. 6 is a vertical longitudinal sectional view through the parts shown in Figs. 1 and 2 taken along the line. 66 in Fig. 2, and shows the upper operating shaft and upper cam as well as the presser table operating mechanism, a

Fig. .7 is a sectional view to an enlarged scale of the parts in Fig. 5 taken along the line 77,

Fig. 8 shows in left hand elevation to an enlarged scale the shuttle housing shown in Figs. 1 and 5 and its relation to the feed.- ing mechanism,

Fig. 9 is a sectional view. ofthe parts shown in Fig. 1 taken along the line 99,

Fig. 10 is a sectional view of the parts shown in Fig. 3 taken along the line 1010,

Fig. 11 is a sectional view of the parts shown in Fig. 7 taken along the line 1111, showing in addition the upper and lower push rods and the fabric being sewed 1n position for alternate stitches of the sewing operation, 4

Fig. 12 shows in a view similar to Fig. 11 the same parts with the push rods in their alternatepositions for making intermediate stitches of the sewing operation,

Fig. 13 is a view to an enlarged scale, of the stitching effected by the machine,

Fig. 14 1s a view of the inner face of the upper push rod cam, and

Fig. 15 is a detail plan view of the filler block used 'inthe fabric guide.

Similar numerals refer to similar parts throughout the several views. I

As shown in the drawings and particularly in Figs. 1, 2 and 3 my machine consists of a bed15, pedestal 16, and arm 17 preferably in the form of an integral metal casting, constituting the support and housing for'the main operating parts of the machine. The arm 17 supports in suitable bearings an upper shaft 18 carrying at its outer righthand end as shown in Figs. 1 and 2, a driving pulley 19 and a hand wheel 20. Adjacent the hand wheel 20, the shaft 18 has formed therein a crank 21 engaged by the upper end of an oscillatory bar 22 engaged at its mid portion by a stud 23, the arm being slotted as' indicated at- 22 to permit it to move longitudinally on the stud 23 as the upper end describes a circular path resulting from rotation of the crank 21. The lower end of the arm 22 has projecting therefrom a stud 24 engaging a groove 25 in a crank 25 carried by the right hand end of the lower shaft-26, said lower shaft being supported by suitable bearings carried by the bed 15. As a result of the construction described rotation of the shaft 18 causes oscillation of the bar 22 and in turn rotation of the shaft 26. The left hand end of the arm 17 as shown in Figs. 1 and 2 is enlarged as indicated at 27 in Fig. 2, to form a housing for a gear 28 carried by and rigidly secured to the shaft 18 and for a cam 29 also carried by and rigidly secured to said shaft. The gear 28 meshes with a second gear 31 rigidly secured to a short shaft 32 carried in suitable bearings by the housing 27, said gears having preferably theratio of two to one although I do not limit myself to this proportion of gears. The inner end of the shaft 32-has rigidly secured thereto a crank pin 33, as more clearly shown in Fig. 1, engaging the upper end of a connecting rod consisting of two

parts

34 and 35 pivotally connected at 36, the axis of the pivot 36 extending at right angles to the axis of the crank 33. Intermediate of its ends, the part 35 is apertured and mounted on a stud 37 rigidly carried by an arm 27 projecting downwardly from the housing 27. The part'35 is normally held against the arm 27 by a spring 38 for apurpose to be described. The lower end of the part 35 has pivotally connected thereto at 39 a block 40 engaging with a sliding fit a groove 41 in a. crank arm 41 rigidly secured to the end of a short shaft 42 extending into the shuttle housing 43. As a result of the construction just described, rotation of the shaft 18 rotates the gear 31 and oscillates the

parts

34 and 35 about the stud 37 thus imparting rotation to the shaft 42 to drive the rotary hook of the machine which is mounted on the said shaft 42 in a manner to be described. For a ratio of two to one of the gears 28 and 31, the hook will be rotated at twice the speed of the shaft 18, although I do not limit myself to this speed of rotation of the book but may employ any other speed relatively to the shaft 18 that may be desirable. The shuttle housing 43 is rigidly secured to a housing 44 through which a needle bar 45 extends in a generally vertical direct-ion and the housin 44 is ivotally mounted at 46 on a housing 47 rigidly supported by the housing 27, the housing 47 serving to enclose and support a part of the operating mechanism for the needle bar. The lower end of the needle bar 45 carries a crank arm 48 having a downwardly extending crank 49 provided at its lower end with a clamp 50 for securely holding in proper position a needle 51 which is preferably of circular conformation.

As more clearly shown in Fig. 5, the needle bar 45 rigidly carries at its upper end one member 52 of a universal joint,- the cooperating member 53 of which is rigidly secured to the lower end of a shaft 54 to the upper end of which a'crank 55 is rigidly secured. As shown in Fig. 2 the crank 55 is pivotally connected by a short link 56 with one end of 'an'operating bar 57 supported in horizontal position by the housing 27 for reciprocation adjacent theface of the cam 29. As shown in Fig. 3, the bar 57 carries near its mid portion a cam 58 secured to the bar by a suitable set screw as indicated, said cam having formed across its inner surface, a curved cam groove 58*Zenga ed by a roller 30, which, as more clearly s own in Fig. 2, is carried by and extends from the outer face of the cam 29. The cam 58 is proyided at its upper portion with a projecting lug 58 contained in a guideway 27 formed in the housing 27 to maintain the cam 58 in proper vertical position for engagement by the roller 30. As a result of the construction just described, since the roller 30 is at all times contained in the groove 58", rotation of the shaft 18 reciprocates the bar 57 in its bearings thus imparting an oscillatory motion to the needle bar and the parts carried thereby, the conformation of said cam groove 58 being such that for each one half revolution of the shaft 18, the needle 51 is moved through its entire stitch forming cycle, and for the other half of each of said revolutions the needle 51 is in its clearing position to permit feeding the material being sewed.

As indicated in Fig. 3 the cam 29 carries in its outer face a cam groove 29 engaged by a roller 59 carried by the upper end of a bar 60 mounted to reciprocate in suitable bearings carried by the housing 27. The

- bar 60 is pivotally connected at its lower end as indicated at 61 with the short armof a bell crank lever 62 pivotally supported at 63, as more clearly shown in Fig. 1 on a lug 27 projecting downwardly from the housing 27. The outer end of the longer arm of the bell crank lever 62 is provided with an opening 62* extending through it for the passage therethrough of the needle thread,

' said bell crank lever serving as a take-up mechanism for the said needle thread at proper intervals during the stitching operation. The cam groove 29 is properly proportioned and timed to effect the take-up operation after the needle thread has been passed around the bobbin and the needle is being withdrawn from the goods.

The cam 29 is provided on its inner face as more clearly shown in Fig. 14, with a second'cam groove 29 in which a sliding shoe 64 is disposed, said shoe being pivotally connected with the inner end of a lever 65, pivotally supported at 66 on the housing 27.

The other end of the lever is pivotally connected by a short link 67 with the upper end of an upper push rod 68 which, as more clearly shown in Fig. 1,- extends downwardly and terminates adjacent the goods being sewed to depress the goods at each alternate stitch in a manner and for a purpose to be described. It will be observed that the cam groove 29 comprises two convolutions, one

within the other radially, with crossing passages leading from each to the other at one point angularly, as a result of which, the push rod 68-is quickly depressed at one portion of its cycle of operation, it is held in de-- pressed position for nearly one rotation of yertical guide way 15 on-which a plate 71 1s mounted for vertical movement and this plate 71 in turn constitutes a vertical uideway for a table 72 lying immediately elow.

the presser foot to receive the goods to be sewed. The table72 is provided on each of its front and rear edges with a bracket 73 which, as more clearly shown in Fig. 10, carries a downwardly projecting rod 7 1 whichenters a holeprovided therefor in the edge portion of the plate 71 and is engaged by a spring 75 in said hole, said springs be ing of sufficient strength to support the table 72 and the goods carried thereby in opera" tive position \for sewing against the presser foot 70.

As more clearly shown in Fig. 6 the bed 15 has extending downwardly therefrom, brackets 15 between the lower ends of which a short shaft 76 is supported and this shaft carries a first arm 77 which is rigidly. secured thereto and extends in a horizontal direction and a second arm 77 rigidly secured thereto which extends Vertically from said shaft. The upper end of the arm 77 is pivotally connected at 78 with a reciprocating rod 79 the left handend of which is pivotally connected with an arm 80 rigidly secured to a short horizontal shaft 81. The shaft- 81 is supported in suitable bearings carried by the bed, 15 and adjacent its .ends has rigidly secured'thereto, similarly disposed arms 83 projecting to the left from the shaft 81 into apertures provided therefor in the plate 71. The arm 7 7 is connected preferably with any convenient form of treadle mechanism by which it may be moveddownwardly and when this is done the rod 79 is caused as a result of the connections above described, to move the arms .83downwardly thus lowering the table 72 to permit the entering of thematerial to be sewed and the removal of the material after it is sewed. Springs 84 are provided on the shaft 81 engaging its bearings and the arms 83, as more clearly shown in Fig. 2, in a manner tending to rotate the shaft 81 aroundto the right for the position of the parts shown in Fig. 6, thus tending to hold the plate 71 in its uppermost position, saidsprings being sufficiently strong to hold the plate in-its uppermost position against any pressure exerted upon the table by ordinary sewing operations and this position is maintained by said springs when the arm 77 is not depressed. As more clearly shown in Fig. 5 the lower I shaft 26 consists oflend and intermediatesections connected'by universal couplings 26* and 26". The portion of the table 72 extending downwardlyadj'acent the plate 71, as indicated at 72 in Fig. 5, carries a,

vertically disposed plate 85 which forms a bearing for the left hand section of the shaft 26. The plate 85 has formed therein in' its outer face a cam groove 85 for receiving the cylindrical end 86 of a short crank 86, the other and extending cylindrical end 86 of which engages with a free turning fit a circular opening in the lower portion of the feedv bar 87. As more-clearly shown in Figs. 3 and 4., the lower portion of the feed bar 87 is mounted to slide horizontally on a guide bar 88, the ends of which are secured to vertical rods 89 mounted for vertical sliding movement in the guideways 90 carried by the table 72. The end section of the lower shaft 26 is rigidly secured to and carries a cam 91, in the central portion of which, as more clearly shown in Fig. 4, a slot 91 is formed to receive with a sliding fit the body portion of the crank 86. The upper end of the feed bar 87 is provided, as more clearly shown in Fig. 4', with teeth 87 projecting through the table 72 immediately below the presser foot 70. As a result of the construction just described and also of the conformation of the cam slot 85' indicated in Figs. 3 and 5, motion in four directions is imparted to the feed bar 87 for each rotation of the shaft 86, first, downwardly away from the material being sewed, second, in-a direction against the direction of feed while the feed. bar is in its lower position, third, upwardly and into engagement with said material, andfourth, while the feed bar is in its uppermost position with the teeth 87 engaging said material, in a direction to feed said material on the table under the presser foot.

The cam 91, as more clearly shown in Fig. .1: is provided with a cam groove 91 having an angular extent of two convolutions around the shaft 26, the inner and outer portions of said cam groove crossing each other as indicated at 91. The cam groove 91, as more clearly shown in- Fig. 5, contains a sliding shoe 92 pivotally connected with thelower end of a vertically movable bar 93, pivotally connected at its upper end by a short link 94 with one end of the lower push rod 95. The push rod 95 is pivotally supported at its mid portion as indicated at 96 from the under side of the table 72, and

at its other end is upwardly extended adjacent the upper portion of the feed bar 87 in the form of a rod 95 adapted to pass through a suitable opening therefor as indicated at 87 in the upper end of the feed bar 87, adjacent the teeth 87. The cam groove 91 is so proportioned that for alternate rotations of the Shaft 26 the lower push rod 95 is in its position indicated in Fig. 5. away from the material being sewed and during intermediate rotations of the shaft 26 is in its alternate position pressing upwardly against said material for a purpose to be described. It will be noted that the cam groove 91", is of the Same general conformation as the cam groove 29 shown in Fig. 14, as a result of which the .cam

groove 29 imparts the same character of motion to the upper push rod 68 as just described as being imparted to the lower push rod 95 by the cam groove 91", the only difference being that the two cam grooves are adjusted relatively to each other so that the upper push rod 68 is in its lower position during each rotation of the shaft 26 for which the lower push rod is in its lowermost position and that the lower push rod 95 is in its upper position during each rotation of the shaft 26 for which the upper push rod 68 is in its uppermost position. It will also be observed that the conformation of each of the cam grooves .just described is such that each push rod is held either in its upper or its lower position for the major portion of a rotation of the corresponding cam, thus holding the fabric in proper position during each stitch for the needle to pass through the fabric and make the stitch before the fabric is released by the push rod. The presser foot as indicated in Fig. 7 is provided with an aperture 70 throu h its upturned portion 70 in line with the

push rods

68 and 95 and between the portion 70 of the presser-foot 70 and the table 72, the shuttle housing 43 carries a guide 97 havin upper and lower walls substantially. para f lel with the ortion 7 0 and the table 72 respectively, or holding the edge portions of the material being sewed, in slightly separated condition to permit proper operation of the stitching mechanism. The guide 97 is open between its said upper and lower walls and the needle 51 is so disposed that it-oscillates between the walls of the guide 97 and through a semicircular opening formed in the edge of said walls in line with the aperture 70*, the path of said needle being indicated by the dotted line 98 in Fig. 7. A filler block .99 having the con formation indicated in Fig. 15 is preferably inserted in the guide 97 between its upper and lower walls, said filler having formed therein a groove 99 through which the needle travels, to retain the needle thread in proper position during the forming of j the loop in making the lock stitch.

As indicated in Fig. 8, the shuttle housing 43 contains a rotary hook 100 which is mounted on the shaft 42 extending through the shuttle housing, said hook being rotated in the direction indicated by the arrow in Fig. 8, by rotation of the shaft 42. The hook 100 contains a bobbin casing 101 of a type common in the art. which in turn contains the bobbin supplying thread to be fed through the shell of the bobbin to the material being sewed. The bobbin casing 101 is provided with a downwardly extending lug 101 engaging a recess 97 in the guide 97 to prevent rotation of the bobbin casing, the engagement between the said lug and recess being sufficiently loose to permit the needle of rotation'of the point 100 serves to hold the loop drawn from the needle thread until the thread is passed somewhat more than [half way around the bobbin casing 101, at

which time the loop slips from the point 101 Without being further carried by the hook, and the take-tip" device 62, by drawing up the slack of the needle thread completes the drawing of the needle thread around the bobbin casing and the forming of the lock in the particular stitch being made. The ratio between the'gears 28 and 31 above described insures thatthe looping of the needle thread around the bobbin casing is effected before the take-up mechanism be ins its operation and the extra rotation of the hook between stitches does no harm. A different ratio of gearing might be employed if preferred, for example the hook m ght make one rotation per stitch by modifyin the action of the needle bar operation mechanism and the take-up mechanism to time the operation of these devices to insure the looping of the' thread around the bobbin casing for each stitch.

As shown in Fig. 11 two layers of

material

102 and 103 are shown in sewing position between the table 72 and the presser foot 70, the edges of the fabric being shown as inturned and held in separated relation by the guide 97. In this view, the lower push rod 95 is shown in its uppermost position forcing the lower layers of material-103, upwardly into the semicircular opening 97 in the edge of the guide 97, in such position that the needle 51 passes throiwh the upper thickness of the lower material 103' and also partly through the lower thickness of said material,

which is the condition imparted to the material being sewed for alternate stitches. By this operation the needle thread is carried through the thicknesses of the lower ma.- terial 103,1Vltl10lll; passing entirely through the lower thickness of said material, the needle thread is looped around the bobbin threa in the manner described and the needle is withdrawn from the said material,-

the takeup mechanism serving to take up the slack'in the needle thread and draw the bobbin thread in interlocked relation with the needle thread into the material 103.

For each intermediate stitch the relation of The conformation of the point.

the push rods 68 and 95'is as shown in Fig. 12, for which condition the lower push rod 95 is in its lowermost position andthe upper push rod 68 is in its depressed position forcing the upper material 102 downwardly into the semicircular aperture 97 formed in the edge of the guide 97, for which condition the needle 51 passes through the lower thickness of the material 102 and through a portion of its upper, thickness, without, however, passing completely through the said upper thickness, and'the stitch, is formed in the same manner described above.

As a result of the stitch formingoperations described, stitches are formed between and through the thicknesses of the sewed material as shown in Fig. 13, which is a diagrammatic view of the stitches themselves in their relation to the dividing line 104 separating the two pieces of material be ing sewed together, the pieces of

material

102 and 103 being indicated diagrammatically in this figure to show their relationship and the stitches being, regarded as completely visible and in the same relation asthough.

separated by separating the edges of the fabric from each other, to stretch the stitches to the positions shown in this fi are. In this figure the, needle thread is in icated at 105 and the bobbin thread at 106.

From the construction above described it will appear that it is necessary to move the guide 97 away from the presser foot and to move the table 72 away from both of these parts, in order to insert the material to be sewed and also to remove the material after the sewing operation. The downward movement of the table 72 is eiiected in the manner above described by movement of the arm 77. downwardly by any desirable means, for example a foot treadle not shown. To move the guide 97 from the presser foot, the following construction is einployed; the upper end of the housing 44 of the needle bar, carries an arm 107, the outer end of which is pivotally connected by-a short link 108 with the left hand end of a lever 109 as indicated in Fig. 1. The lever 109 is pivotally mounted at 110 on the main arm 17 of'the machine and the other end of said lever is pivotally connected with the upper end of a rod 111. The rod 111 extends downwardly through an aperture 16 in the pedestal 16 and at its lower end, as shown in Fig. 6, is pivotally connected at 112 with one end of a connecting rod 113, the other endof which is pivotally connected with the connection between the arm 77 and the rod 79. The

right in the cam slot 114", as shown in Fig. 6, and said cam slot serves to move the rod 111 downwardly thus rotating the lever 109 around to the right on its pivot 110 and raising the outer end of the arm 107. This moves the needle bar housing 44 and the shuttle housing 43 to the right on their pivotal support 46, thus moving the guide 97 carried by the shuttle housing 43 away from the presser foot, without disturbing .the relation between the needle bar, the guide 97 and the shuttle housing and parts carried thereby. As indicated in Figs. 1 and 6 a'spring 115 is provided around the pivot support 110 en aging the lever 109, to hold the guide 97 wit a desired degree of pressure against the material being sewed. The ball and socket connection 39 between the sliding bar 40 and the connecting rod '35 and the spring 38 on the stud 37, permit the motion described of the needle bar housing 44 and the shuttle housing 43 and the parts carried thereby, away from the presser foot 70, and motion of the needle bar 45 from one position to the other relatively to the fixed housing 47 is permitted by the

universal joint

52, 53 above described between the needle bar and the shaft 54.

It will be understood that my improved. felling machine is preferablfy adapted for material or fabric in the manner indicated.

To this end, the upper push rod 68 may be made in two parts as indicated, the adjacent ends of which are provided respectively with right hand and left hand threads connected by a turnbuckle 68, held in any desired adjustment b a lock nut carried by one of the parts of tie push rod. Similarly the extension 95 of the lower push rod 95 is shown as consisting of a threaded rod extending through a threaded opening in the end of the body portion of the push rod and held in any desired adjustment by a suitable lock nut as indicated. By adjusting the push rods to the thickness of the.

material being sewed, the stitches may be made to pass through any desired portion of the thickness of the material, whether the pieces of material being sewed together are of the same thickness or of difi'erent thicknesses.- Again it is desirable for the best results. that the presser foot be adj ustable slightly' towards and away from the stitching position and this may be accomplished by securing the presser foot 70 to the lower end of the frame 69 by a suitable screw as indicated passing through a clearance opening therefor in a flange on the lower end of the frame 69, said clearance opening being suflicient to permit all, necessary adjustments of the presser foot. In this manner thestitching point may be maintained exactly under the axis ofthe pivotal support 46, which is a desirable condition, even though the" material or fabric being sewed is of different thickness at different times, since the presser foot 70 ma be moved towards or away from the stitc ing point as desired to compensate for different thicknesses of 'material. For the same reason it is desirable. that the pressure exerted by the springs for supporting the table 72 shall be adjustable, to insure that a proper working pressure shall be exerted upon the material or fabric being sewed for'diflerent thicknesses of material or fabric that may be used from time to time. This adjustment may be secured by extending the holes for receiving the springs 75 downwardly through the edge portions of the plate 71 and threading the lower ends of said holes to receive correspondingly threaded sleeves 71 bored to clear the lower ends of the rods 74 and adapted to engage the lower ends of the springs 75. Byadjusting these sleeves 71, the tension of the springs 75 may be 'increased or diminished as needed to hold the table 72 in sewing position with just the desired pressure on the material being sewed.

The sleeves 71 ma be held in desired adjustment by suitab e lock nuts 71 as indicated. T

It will be noted that the needle bar housing 44, under the action of the spring 115 engages the housing 47 to prevent movement of the needle bar housing 44 on its pivot 46 beyond a certain limiting position for which the stitc'hing point is immediately below the axis of the pivot connection 46. This relation of parts insures that the guide 97 is in its position of closest approach to the table 72, for any particular position of the table 72, when the needle bar housing 44 is in its limiting position referred to and that therefore movement of the'guide 97 away from the stitching position always decreases the pressurebetween the guide and the ma-- terial engaged thereby, which may be between the guide and the table 72. It will also be observed that the center of the

universal connection

52, 53 lies in the axis of j the pivot-a1 connection 46, which insures that the needle bar shall be properly rotated for any variation in position of the needle bar housing 44 relatively to the presser foot 70 for variation in the thickness of material being sewed.

As indicated in Fig. 6 the slot 114 in the cam 114 is preferably so conformed that nearly or quite all of the movement imparted to the rod 111 downwardly by depression of the arm 77, occurs during a small part of the depression of the arm 77, beginnin with the beginning'of depression of sai may be readily insertedfor the purposes dearm, which insures that the table 7 2 shall be practically in sewing position when the guide 97 is moved into engagement with and away from the layers of material to be sewed and therefore proper engagement of the guide 97 and the layers of the: material is insured.

' lVhile I have referred above to the guide 97 as being hollow or open, it Willbe understood that I do so to provide a construction readily made and in which the tiller block 99 scribed. It is to be understood, however, that the guide 97 may be made in any desired manner, the only requisite being that the surfaces of the guide engaging the layers of fabric, shall have the inclined relation to each other above described and that the guide shall 'aliord a clearance path for the needle between the inclined surfaces, which clearance path preferably, although not necessarily, constitutes a restraining path for the needle thread during the looping operation as described above.

From the above description it will appear that by my improved felling machine I provide a means for forming stitches be tween layers of material being sewed, that the stitches mayextend through any desired part of the thicknesses of material being,

sewed and that the stitches formed are of the lock-stitch, double thread type and are wholly contained between the layers of material being sewed and within their outer edges, thus entirely concealing the stitches and yet insuring all of the strength and permanence resulting from the lock type,

double thread form ofstitching. It will also be understood that any desired degree of operation may b imparted to the feed bar loy means of the operating cam described, to provide any desired length of till stitches, the length of the stitches depending upon the amount of motion imparted to v the feed bar and the length of time of engagement of the teeth of the feed bar with the material being fed or advanced thereby. Suitable tensioning devices for each of the threads are employed, which may be of any form known in the art and which are not shown since they constitute no part of the present'invention.

While I have shown my invention in 'the particular embodiment above described it. will be understood that I do not limit my'-' self to this exact construction as I may employ equivalents known to the art at the time of the tiling of this application without departing from the scope of the appended claims.

What I claim is:

1. In a sewing machine, the combination of a table for supporting thicknesses of material to be sewed, a guide for separating said thicknesses at the stitching point, stitch hook, an upper push rod for depressing the upper thickness of material into the path of the needle for alternate stitches, and a lower push rod for raising the lower thickness of material into the path of the needle for intermediate stitches, said push rods acting in opposed relation to each other above and below the material being sewed and substantially in alinement with each other.

2. In a sewing machine, the combination of a table for supporting thicknesses of material to be sewed, a guide for separating said thicknesses at the stitching point, stitch forming devices comprising an oscillatory needle, a bobbin and a rotary loop-forming hook, an upper push rod for depressing the upper thickness of material into the path of the needle for alternate stitches, a lower push rod for raising the lower thickness of material into the path of the needle forlintel-mediate stitches, a housing for said stitch forming devices, a pivotal support for said housing, and means for moving said' housing on its pivotal support awa from the stitching point to facilitate placing the said thick nesses of material in position to be sewed.

3. In a sewing machine, the combination of a table for supporting thicknesses of mamaterial into the path of-the needlefor intermediate stitches, a housing for said stitch forming deyices, a pivotal support for said' housing, and m'eansfor moving said housing on itspivotal support away from the stitching point to facilitate placing the said thicknesses of material in position to be sewed, said guide being carried by said housing and movable therewith.

4. In a sewing machine, the combination of a table for supporting thicknesses of material to be sewed, a guide for separating said thicknesses at the stitching point, stitch forming devices comprising an oscillatory needle, :1 bobbin and a rotary loop-forming hook, an upper push rod for depressing the upper thickness of material into the path or .the needle foralternate stitches, a lower push its pivotal support away from the stitching point to facilitate placing the said thicknesses of material in position to be sewed, said housing maintaining said needle, said bobbin of a table for supporting thicknesses of material to be sewed, a guide for separating said thicknesses at the stitching point, stitch forming devices comprising an oscillatory needle, a bobbin and a rotary loop-forn'iing hook, an upper push rod for depressing the upper thickness of material into the path of the needle for alternate stitches, a lower push rod for raising the lower thickness of material into the path of the needle for interme; diate stitches, a housing for said stitch forming devices, a pivotal support for said housing, and means for moving said housing on its pivotal support away from the stitching point to facilitate placing the said thicknes'sesof material in position to be sewed, said uide being carried by said housing and mova 'le therewith, said housing maintaining said guide, said needle, said bobbin and sa1d hook in operative relation to each other at all times.

6. In a sewing machine,t he combination of a table for supporting thicknesses of material to be sewed, a guide for separatingsaid thicknesses at the stitching point, stitch formlng devices comprising an oscillatory needle, a bobbin and a rotary loop-forming hook, an upper push rod. for depressing the upper thickness of material into the path of the needle for alternate stitches, a lower push rod for raising the lower thickness of forming devices comprising an oscillatory needle, a bobbin and a rotary loop-forming hook, an upper push rod for depressing the upper thickness of material into the path of the needle for alternate stitches, a lower push rod for raising the lower thickness of material into the path of the needle for intermediate stitches, a housing for said stitch forming devices, a pivotal support for said hous ing, means for moving said housing onits pivotal support. away from the stitching point to 'facilit-ateplacing the-said thicknesses of material in position to'be sewed, a guideway supporting said .table, and devices for moving said table away from the stitching point to facilitate placing said thicknesses of material in position to be sewed.

'8. In a sewing machine, the combination of a table for supporting thicknesses of material to be sewed, a guide for separating said thicknesses at the stitching point, stitch forming devices comprising an oscillatory needle,

a bobbin and a rotary loop-forming hook, an upper push rod for depressing the upper thickness of material into the path of the needle for alternate stitches, a lower push rod for raising the lower thickness of material into the path of the needle for intermediate stitches, a housing for said stitch formlng devices, a pivotal support for said housing, means for moving said housing on its pivotal support away from the stitching point to facilitate placing the saidithicknesses of material in posltion to be sewed, a guideway supporting said table, devices for moving said table away from the stitching point to facilitate placing said thicknesses of material in position to be sewed, and connections between said moving means and said moving devices for efli'ecting simultaneous movement thereof.

'9. In a sewing machine, the combination of a table for supporting thicknesses of materialto be sewed, a guide for-separating said thicknesses at the stitching point, stitch forming devices comprising an oscillatory hook, an upper push rod for depressing the upper thickness of material into the path of the needle for alternate stitches, a lower push rod for raising the lower thickness of material into the path of the needle for intermediate stitches, a first guideway supporting said table, resilient means between said guideway and said table, a stationary bed constituting a second guideway for said first guideway, and devices for moving said first guideway and said table away from the stitching point to facilitate placing said thicknesses of material in position to be sewed, said push rods acting in opposed relation to each other above and below the material being sewed and substantially in alincment with each other.

10. In a sewing machine, the combination of a tablefor supporting thicknesses of material to be sewed, a guide for separating said thicknesses at the stitching point, stitch forming devices comprising an oscillatory needle, a bobbin and a rotary loop-forming hook, an upper push rod for depressing the upper thickness of material into the path of the needle for alternate stitches, a lower push rod for raising the lower thickness of material into the path of the needle for intermediate stitches, a housing for said stitch forming devices, a pivotal support for said housing, means for moving said housin on its pivotal support away from the stitc ing point to facilitate placing the said thicknesses of material in position to be sewed, a first-guideway supporting said table, resilient means between said guideway and said needle, a bobbin and a'rotary loop-forming guideway for said first guideway, and devices for moving said first guideway and said table away from the stitching point to facilitate placing said thicknesses of material in position to be sewed.

11. In a sewing machine, the combination of a table for supporting thicknesses of material to be sewed, a guide for separating said thicknesses at the stitching point, stitch forming devices comprising an oscillatory needle, a bobbin and a rotary loop-forming hook, an upper push rod for depressing the upper thickness of material into the path of the needle for alternate stitches, a lower push rod for raising the lower thickness of material intothe path of the needle for intermediate stitches, a housing for said stitch forming devices, a pivotal support for said housing, means for moving said housing on its pivotal support away from the stitching point to facilitate placing the said thicknesses of material in position to be sewed,

a first guideway supporting said table, resilient means between said guideway and said table, a stationary bed constituting a second guideway for said first guideway, devices for moving said first uideway and said table away from the stitc ing point to facilitate placing said thicknesses of material in position to be sewed, andconnections between said moving means and said moving devices for effecting simultaneous movement thereof.

12. In a sewing machine, the combination of a table for supporting thicknesses of material to be sewed, a guide for separating said thicknesses at the stitching point, stitch forming devices comprising an oscillatory needle, a bobbin and a rotary loop-forming hook, an upper push rod for depressing the upper thickness of material into the path of the needle for alternate stitches, a lower push rod for raising the lower thickness of material into the path of the needle for intermediate stitches, a guideway supporting said table, devices for moving said table away from the stitching point to facilitate placing said thicknesses of material in position to be sewed, and a spring for holding said table in stitching position when said moving devices are not actuated, said push rods acting in opposed relation to each other above and below the material being sewed and substantially in alincment with each other. e

13. In a sewing machine, the combination "of a table for supporting thicknesses of material to be sewed, a guide for separating said thicknesses at the stitch ng point, stitch forming devices comprising an oscillatory needle,.a bobbin and a rotary loop-forming hook, an upper push rodfor depressing the upper thickness of material into the path of the needle for alternate stitches, a lower push rod for raising the lower thickness of material into the path of the needle for intermediate stitches, a first guideway supporting said table, resilient means between said guideway and said table, a stationary 40 bed constituting a second guideway for said first guideway, devices for moving. said first guideway and said table away from the stitching point to facilitate placing said thicknesses of material in position to be sewed, and a spring for holding said first guideway in its upper positionwhen said moving devices are not actuated, said push rods acting in opposedrelation to each other above and below the material being sewed and substantially in alinement with each other.

14. In a sewing machine, the combination of a stationary presser foot, stitch forming devices adjacent said foot, a movable'housing for said devices. a support for said housing, and devices for moving said housing from stitching position to facilitate inserting material to be sewed. I

15. In a sewing machine, the combination of a stationary presser foot, stitch forming devices adjacent said foot, a movable housing for said devices, a support for said housing, a movable table for supporting material 7 to be sewed, and devices for by the same operation moving said housing and said table away from stitching position to insert said material.

16. In a sewing machine, the combination of a stationary presser foot, stitch forming 0 devices adjacent said foot, a movable housing for said devices, a support for said housing, devices for moving'said housing from stitching position to facilitate inserting material to be sewed, and a spring tending to 1 hold said housing in stitching position.

17. In a sewing machine, the combination of a stationary presser foot, stitch forming devices adjacent said foot, a movable housing'for said devices, a support for said housing, a movable table for supporting 'mate-, rial to be sewed, devices for by the same operation moving said housing and said table away from stitching position to insert said material, and a spring tending to hold said. housing and said table in stitching position.

18. In a sewing machine, the combination of a'stationary presser foot, stitch forming devices adjacent said foot, a guide for se a rating the edges of the layers of material eing sewed, a movable housingfor, said devices and guide, a support for said housing, and devices for moving said housing from stitching position to facilitate inserting the material to be sewed.

19. In a sewing machine, the combination of a stationary presser foot, stitch forming devices adjacent said foot, a guide for separating the edges of the layers of material being sewed, a movable housing for said de- 180 vices and guide, a support for said housing, a movable table for supporting material to be sewed, and devices for by the same operation moving said housing and said table away from stitching position to insert said material.

20. In a sewing machine, the combination of a stationary presser foot, stitch forming devices adjacent said foot, a guide for separating the edges of the layers of material being sewed, a movable housing for said devices and guide, a support for said housing, devices for moving said housing from stitching position to facilitate inserting materal to be sewed, and a spring tending to hold said housing in stitching position.

21. In a sewing machine, the combination of a stationary presser foot, stitch forming devices adjacent said foot, a guide for separating the edges of the layers of material being sewed, a movable housing for said devices and guide, a support for said housing, a movable table for supporting material to be sewed, devices for by the same 0 eration moving said housing and said tab e away from stitching position to insert said material, and a spring tending to hold said housing and said table in stitching position.

-22. In a sewing machine, the combination of a guide separating the layers of material being sewed, devices for forming stitches between the separated layers of material, an upper push rod for depressing the upper layer 0 material into the path of the stitch forming devices, a lower push rod for raising the lower layer of material into the path of the stitching devices. and mechanism for alternately operating said push rods, said push rods acting in opposed relation to each other above and below the material being sewed and substantially in alinement with each other.

23. In a sewing machine, the combination of a guide separating the layers of material being sewed, devices for forming stitches between the separated layers of material, an upper ush rod for depressing the upper layer 0? material into the path of the stitch forming devices, a lower push rod for raising the lower layer of material into the path of the stitching devices, a cam for actuating each push rod, each cam actuating its push rod every second revolution, and a common mechanism connectlng and operating said cams, saidvcams being adjusted relatively to each other to alternately operate said push rods, said push rods acting in opposed relation to each other above and below the material being sewed and substantially in alinement with each other.

24. In, a sewing machine, the combination of a support for layers of material being sewed, a guide for separating said layers of material at the sewin point, a curved needle carrying a first threa a needle bar supporting said needle for moving it between said separated layers and through the stitchlng point, a rotary hook having an arcuate path adjacent the forward position of said needle to loop the needle thread, a bobbin casing loosely supported adjacent said hook to be encircled by said loop and carrying a second thread, and devices for alternately moving the layers of material vertically upwardly and downwardly into the needle path for successive stitches.

25. In a sewing machine, the combination of a support for layers of material being sewed, a guide for separating said layers of material at the sewing point, a curved needle, a needle bar supporting said needle for moving it between said separated layers and through the stitching point, a rotary hook having an arcuate path adjacent the forward position of said needle to loopthe needle thread, a bobbin casing loosely supported adjacent said hook tobe encircled by said loop, and push rods engaging the upper and lower layers of material to move'them alternately into stitching position for successive operations of the needle, said push rods acting in opposed relation to each other above and below the material being sewed and substantially in alinement with each other.

26. In a sewing machine, the combination of a support for layers of material being sewed, a guide for separating said layers of material at the sewing point, a curved needle, a needle bar supporting said needle for moving it between said separated layers and through the stitching point, a rotary hook having an arcuate path adjacent the forward position of said needle to loop the needle thread, a bobbin casing loosely supported adjacent said hook to be encircled by said loop, push rods engaging the upper and lower layers of material'to move them alternately into stitching position for succescive operations of the needle, a cam for each push rod, and operating connections between each cam and the correspondin push rod, said push rods actin in opposed relation to each other above and below the material being sewed and substantially with each other.

27. In a sewing machine, the combination of a support for layers of material being sewed, a guide for separating said layers of material at the sewing point, a curved needle, a needle bar supporting said needle for moving it between said separated layers and through the stitching point, a rotary hook having an arcuate path adjacent the forward position of said needle to loop the needle thread, a bobbin casing loosely supported adjacent said hook to be encircled by said loop, push rods engaging the upper and lower layers of material to move them alternately into stitching position for sucin alinement cessive o erations of the needle, a cam for formation and each actuating its push rod' for each alternate-operation of said needle, said cams being timed to be alternately operative, said push rods acting in opposed relation toeach other above and below the material being sewed and substantially 1n alinement with each other.

28. 'In a sewing machine, the combination of a support for layers of material being sewed, a guide for separating said layers of material at the sewing point, a curved needle, a needle bar supporting said needle for moving it between said separated layers and through the stitching point, a rotary hook having an arcuate path adjacent the forward position of said needle to loop the needle thread, a bobbin casing loosely supported adjacent said hook to be encircled by said loop, a housing for said needle bar. said hook and said bobbin casing, said housing supporting said guide, and a pivotal support, 'for said housing permitting movement of said housing and the parts carried thereby away from and towards the sewing point.

29. In a sewing machine, the combination of a support for layers of. materials being sewed, a guide for separating said layers of material at the sewing point, a curved needle, a needle bar supporting said needle for moving it-between said separated layers and through the stitching point, a rotary hook having an arcuate path adjacent the forward position of said needle to. loop the needle thread, a bobbin casing loosely'supported adjacent said hook to be encircled y said loop, a housing for said needle bar,

said hook and said bobbin casing, said housing sup orting said guide, a pivotal support for sa1 housin rmitt ing movement of said housing an t e parts carried thereby away from and towards the sewing point,- whereby the parts carried by said housing are maintained in operative relation to each other for all positions of said housing, and

devices for swinging said housing on its pivotal support.

1 to be sewed, a gul 30. In a sewing machine, the combination of a table for supgorting layers of material e having walls diverging from the stitching ition at an acute angle for separating said layers of material, a curved needle ina plane between the guide walls and having a path of travel extending between said guide walls and throughan opening in theirintersect-ing edges at the sewing sitlon, a needle bar for supporting and oscillating said needle, a hook rotatable 'in a vertical plane adjacent the forward position of the needle to loop the needle thread, and a bobbin casing loosely supported within as book to'be encircled by said loop. Y

31. In a sewing machine, the combination of a table for supporting layers of material to be sewed, a guide having walls diverging from the stitching position at an acute angle for separating said layers of material, a curved needle in a plane between the guide walls and having a path of travel extending between said guide walls and through an opening in their intersecting edges at the sewing position, a needle bar for supporting and oscillating said needle, a hook rotatable in a vertical plane adjacent the forward position of the needle to loop the.- needle thread, a bobbin casing loosel supported within said hook to be encircled by said loop, one of the walls of said guide being substantially parallel with said table, and a presser foot having an upwardly inclined extension adjacent to and substantially parallel with the other wall of said guide.

32. In a sewing machine, the combination of a table for supporting layers of material to be sewed, a guide having walls diverging from the stitching position at an acute angle for separating said layers of material, a curved needle in a plane between the guide walls and having a path of travel extending between said guide walls and through an opening in their intersecting edges at the sewing position, a needle bar for supporting and oscillating said needle, a hook rotatable in a vertical plane adjacent the forward position of the needle to loo the needle thread,a bobbin casing loosefv supported within said hook to be encircled by said loop,

ermitting movement of said housbetween said guide walls and through an opening in their intersecting edges at the sewing ition, a needle bar for supporting and oscillating said needle," a hook rotatable in a vertical plane'adjace'nt the forwardpo sition of the needle to loop the Iieedle thread,

a bobbin casing loosel supported within said book to be encilc ed by'said loop,'a housing for saidneedle bar, said hook and said bobbin casing, said housing supporting said guide, a pivotal'support for said housing permittingmovement of said housing and the parts carried thereby away from and towards the sewing point, said table being movable vertically, and devices for moving said housing and said table away from the stitching point to insert and remove said material.

34., In a sewing machine, the combination of a table for supporting layers of material to be sewed, a gui e having walls diverging from the stitching position at anacute angle for separating said layers of material, 'a curved needle in a plane between the guide Walls and'ha-ving a path of travel extending between said'guide walls and through an opening in their. intersecting edges at the sewing osition, a'needle bar for supporting and oscillating said needle, a hook rotatable in a vertical plane adjacent the forward position of the needle to loop the needle thread, a bobbin casing loosely supported within said hook to be encircled by said loop,

one of the walls of said guide being substantially parallel with said table, a presser foot having an upwardly inclined extension adjacent to and substantially parallel with the other wall of said guide, a housing for said needle ba'r, said hook and said bobbin casing, said housing supporting said guide,

a pivotal support for said housing permitting movement of said housingand the parts carried thereby away from and towards the sewing point, said table being movable vertically, and devices for moving said housing and said table away from the stitching point to insert and remove said material.

35. In a sewing machine, the combination of a table for supporting layers of material to be sewed, a hollow guide having walls diverging from the stitching position at an acute angle for separatingsaid layers of material, a curved needle in a plane be tween the guide walls and having a path of travel extending between said guide walls and through an opening in their intersecting edges at the sewing position, a needle bar for supporting and oscillating said needle, a hook rotatable in a vertical plane adjacent the forward position of the needle to-loop the needle thread, a bobbin casing'loosely supported within said hook to be encircled by said loop, and a block in said guide fitting its inclined walls and having a circular groove constituting a clearance for said needle and forming a retaining guide for the, needle thread.

36. In a sewing machine, the combination of a'table for supporting layers of material to be sewed, a guide having walls diverging from the stitching position'at an acute angle for separating said layers of material, a curved needlein a. plane between the guide walls and having'a path of travel extending between said guide. walls and through an opening in their intersecting edges at the sewing position, a needle bar for supporting and oscillating said'needle, a hook rotatable in a vertical plane adjacent the forward position of the needle to loop the needle thread,

from the stitching position at an acute angle for separating said layers of material, a curved needle in a plane between the guide walls and having a path of travel extending between said guide walls and through an opening in their intersecting edges at the sewing position, a needle bar for supporting and oscillating said needle, a hook rotatable in a vertical plane adjacent the forward position of the needle to loop the needle thread, a bobbin casing loosely sup ported within said hook to be encircled by said loop, and devices for alternately moving the layers of material into said guide opening into the needle path for successive stitches.

38. In a sewing machine, the combination of a table for supporting layers of materialto be sewed, a guide having walls diverging from the stitching position at an acute angle for separating said layers of material, a curved needle in a plane between the guide walls and having a path of travel extending between said guide walls and through an opening in. their intersecting. edges at the sewing position, a needle bar for supporting and oscillating said needle, a hook rotatable in a vertical plane adjacent the forward position of the needle to loop the needle thread, a bobbin casing loosely supported within said hook to be encircled by said loop, and push rods in line with said guide opening engaging the upper and lower layers of material to move them alternately into stitching position for successive operations of the needle. 7

39. In a sewing machine, the combination of a table for supporting layers of material to be sewed, a guide having walls diverging from the stitching position at an acute angle for separating said layers of material, a curved needle in a plane between the guide walls and having a path of travel extending between said guide walls and through an opening in their intersecting edges at the sewing position, a needle bar for supporting and oscillating said needle, a hook rotatable in avertical plane adjacent the forward position of the needle to loop the needle thread, a bobbin casing looz'ely supported within said hook to be encircled by said loop, push rods in line with said guide opening engaging the upper and lower layers of material to move them alternately, into stitching position for successive operations of the needle, a cam for each push rod, and operating connections between each cam and the corresponding push rod. I

40. In a sewing machine, the combination of a table for supporting layers of material to be sewed, a guide having walls diverging from the stitching position at an acute angle for separating said layers of material, a curved needle in a plane between the guide walls and having a path of travel extending between said guide walls and through an opening in their intersecting edges at the sewing position, a needlebar for supporting and oscillating said needle, a hook rotatable in a vertical plane adjacent the forward position of the needle to loop the needlethread, a bobbin casing loosely supported within said hook to be encircled by said loop, push rods in line with said guide opening engaging the upper and lower layers of material to move them alternately into stitching position for successive operations of the needle, a cam for each push rod, and operating connections between each cam and the corresponding push rod, said cams being of similar conformation and each a,c tuatingits push rod for each alternate operating of said needle, said cams being timed to be alternately operative.

41. In a sewing machine, the combination of a guide separating the layers of material being sewed, devices for forming stitches between the separated layers'of material, an

upper push rod for-depressing the upper layer of material into the path of the stitch forming devices, a lower push rod for raising the lower layer of material into the path of the stitching devices, a cam for actuating each push rod, each cam actuating its .pusn rod every second revolution, and a common mechanism connectingand operating said cams, said cams being adjusted relatively to each other to alternately operate said push rods, said cams holding each said push rod at rest in its material bending position during the insertion of the needle through said material and its withdrawal therefrom in forming the corresponding stitch.

, 42. 'In a sewing machine, the combination of a guide separating the layers of material being sewed, devices for forming stitches between the separated layers of material, an upper push rod for depressing the upper layer of material into the path of the stitch forming devices, a lower push rod for raising the lower layer. of material into thepath of the stitching devices, a cam for actuating each push rod, each cam actuating its push rod every second revolution and holding the same in retracted position during each alter-' nate revolution, and a common mechanism connecting and operating said cams, said cams being adjusted relatively to each other to alternately operate said push rods.

In witness whereof, I hereunto subscribe my name this 28th day of March, A. D.

1923. MAURICE D. BRODY.