US1489391A - Attachment for sewing machines - Google Patents

Description

April 8 1924. 1,489,391"

A. B. MATTINGLY v ATTACHMENT FOR SEWING MACHINES Original Filed Feb. 19, 1918 s sheets-sheet 1 Inventor:

April 8, 1924. 1,489,391

, A. MATTINGLY ATTACHMENT FOR SEWING MACHINES Original Filed Feb. 19, 1918 6 Sheets-Sheet 5 I [W m FEM: jgim 0 66 /35 3 v 56 .111- ,i

April 8, 1924. r 1,489,391

A. B. MATTINGLY ATTACHMENT FOR SEWING MAqHINEs.

E Inventor:

April 8,. 1924. 1,489,391

A. B. MATTINGLYv ATTACHMENT FOR SEWING MACHINES Original Filed Feb. 19. 1918 6. Sheets-Sheet 5 inventor:

April 8, 1924. 1,489,391

A. B. MATTINGLY ATTACHMENT FOR SEWING MACHINES Original Filed Feb. 19, 1918 e Sheets-$11961. e

- no rs uvwx Fatented Apr. 8, 1924.

UNITED STATES PATENT orrics.

ALBERTUS B. IIIATTIN'GLY, OF NEW YORK, N. Y.

ATTACHMENT FOR- SEWING MACHINES.

Application filed February 19, 1918, Serial No. 218,076. Renewed September 1, 1923.

To all whom it may concern:

Be it known that I, Atnnnros B. MAT- TlNGLY, a citizen of the United States, and

resident of NewYor-k, in the county of New York and State of New York, have invented certain new and useful Improvements in Attachments for Sewing Machines, of which the following is a specification.

This invention relates to an improvement in attachments for sewing machines, and the inventor is aware that the device is of a nature similar to that disclosed in British Letters Patent No. 17,153 of 1905, to Hills, and United States Patents No. .l12,081, to Fletcher, No. 446,736, to Fletcher, No. 990,601, to. Seward, and No. 990,610, to Turck, and the object is to overcomesome of the objectionable features of these devices and to tt'urther improve the same.

The principal objects are to provide a device ofthis character to automatically cut or slit the cloth just in advance of the stitching or bindingof the button-hole so that the needle may pass alternately through the cloth and then through the slit or cut, thus causing the thread to be brought through the cut and make a perfect binding of the raw edges of the work, and to provide a means for positively actuating the knife with a quick and decisive action at the proper periods to make the cut the proper length according to the length of the buttonholes, and to have the length of cut automatically adjust itself with the adjusting of the device for the length of the button-hole.

The further objects are to provide a device of this character which will provide a means for more evenly distributing the stitches around the contour of the buttonhole than has heretofore been accomplished, and to provide means whereby a more perfect adjustment of the cutting-device as regards its alinement relative to the needle of the sewing machine is obtained.

The still further objects are to provide a device or". this character which by its construction is considerably reduced in height and thereby doing away withthe necessity of removing the face plate of the sewing machine to adjust the presser bar, and by the construction of the base plate obviating the necessity of removing the feed dogs of the sewing machine.

The still further objects are to provide an improved ratchet device for effecting the lateral vibration of the work clamp, to pro duce'the overstitch of the edge of the button-hole, and to form other parts of the device by the stamping process, screw machines, which is the cheapest method of tion; but I do not wish to confine myself to the exact construction shown, as I have, for the sake of clear illustration, exaggerated some of the parts, especially in the side elevations, and the cam faces of the yoke upon which the eccentric cam works.

In the accompanying drawings, showing one embodiment of myinvention, Figure 1 is a plan view of the device; Fig. 2 is a similar View to Fig. 1, partly broke'nawayto show the revolving disk and thecam for moving the work clamp; Fig. 3 is a similar view to Fig. 2, with the revolving disk re moved; Fig. 4c is a similar view to Fig. 3 and a section taken on line 1-4 of Fig. 5 5 is a side elevation; Fig. 6 s sectional view taken on the line 6 j 6 of Fig. 5; 7 is a similar view to Fig. 6, with the knife and its operating means removed; Fig. 8 is a similar View to Fig. 7, with the work clamp removed showing the vibrating means; Fig. 9 isasimilar view to Fig. 8, with the vibrating means removed; FigflO is a central vertical sectional view; Fig. 11 is a perspective view of the operating lever: Fig. 12 is a, detail plan of the vibrator; Fig. 13 is an end elevation of the vibrator; Fig. 14 is a side elevation of the vibrator; Fig. 15 1s a perspective view of the vi rater carrier; Fig. 16 is a plan of the sup porting plate; Fig. 1? ma bottom plan ofthc revolving disk; Fig. 18 is a central section of the revolving disk; Fig. 19 is a plan of the can] plate; Fig. 2G is a side elevation of the cam plate; Fig. 21 is a plan of the knife carrier; Fig. 22 is side elevation of the knife carrier; Fig. 23 is a plan of the rice the oaeratin lever 4 which rocks knife shield and integral therewith the stripper plate for the needle and the guide for the work clamp; Fig. 24 is a side elevation of Fig. 23; Fig. 25 is a plan of the work clamp; Fig. 26 is a plan of the ratchetcam; Fig. 27 is a section of the ratchet cam; Fig. 28 is a plan of the pawl plate of the vibrator; Fig. 29 is a plan of the spring pawl for operating the ratchet cam; Fig. 30 is a bottom plan of the cam member showing the cam for operating the knife and the race cam for controlling the work clamp; Fig. 31 is a plan of the upper portion of the assembling stud carrying the.

brake springs; Fig. 32 is a side elevation of Fig. 31; 33 is a plan of thelower portion of the assembling stud and Fig. 34 is a side elevation of Fig. 33; Fig. 35 is a plan of the linkage for aliningv the work clamp and knife with the needle; Fig. 36 is a diagrammatic view showing the movement of the work clamp and cam when the operating cam moves in a circular motion; Fig. 37 is a view similar to Fig. 36, but showing the cam moving in an oval path.

I provide a suitable base plate 1. which is secured to a rear throat plate 2 of the sewing machine in any suitable manner, but preferably screwed thereto, as shown in Fig. 1 of the drawings.

The base plate 1. is provided with an ear 3, which is upwardly turned and caron a pivot 5 formed of a large screw, the lever 4 being provided with a bifurcated end 6 which engages the shank of the screw oi? the tightening collar of the needle bar of the sewing machine. The lever 4 is further provided with an arc-shaped slot 7, through which passes the arm of the friction clutch, which receives its movement from the screw 8 in the ear 9 and the rear end 10 of the slot 7. The screw 8 is frictionally held from turning by the pressure of the spring 11 against its head and the ear 9. The lever- 4 is further provided with an arm or downward extension which has a bifurcated end 12 which operates the pawl 13 and the pawl plate 14 by the lever 15, which is mounted on the throat plate 2 by means of a body screw forming a pivot 16. In the forward end of the lever 15 is a pin 17 (see Figs. 9, 28 and 29) which operates the pawl 13 and the pawl plate 14 through the slots 18 and 19.

The base plate 1 is further provided with a pivot or stud 20' made up of two parts 21 and 22. The lower portion 21 of the stud is hollow and has its upper and lower ends turned down, leaving a body portion 23 which is slotted on opposite sides forming grooves 24 for the reception of the extensions 25 of the part 22, and a washer 26 is forced on to the lower part of the part 21. The Washer 26 forms a substantial base for holding the stud in a vertical position on the base lists which is done b the screw 27 passing through the washer and the base plate 1 and the hollow part 21 and l eing screwed into the part 22, which locks all of the several parts assembled on the stud in position by its head, in which are secured two springs 29 which act as friction brakes in connection with the cam member 30, which is driven by a friction device (see Figs. 4 and 10) composed. of a friction ring 31 supported by a flange on the cam member in the recess 33 of the ring is pivoted a friction dog 34, which is normally held in contact with cam member 3'0 by a spring 35. The lever 36 of the dog passes through an opening or slot 7 in. the operating lever 4 and is operated by the screw and the rear end of the slot 7, the screw 8 forcing the dog and ring backwards and relieving the pressure on the cam member. The springs 29 bearing against the surface 37 prevent the cam member from turning and the rear end of the slot forces the dog forward and causes the nose 38 to bite or grip the surface 39 of the cam member 30 and revolve the same a predetermined amount, which is regulated by the screw 8. The plate 40 secured to the cam member 30 keeps the ring in position.

Botatably mounted upon the stud 20 and supported by the washer 26 are the pawl 13 and the pawl plate 14 (which are swung in an are by the end 12 of the lever 4 through the lever 15 and its pin 17 in a forward and backward movement). Rotatably mounted upon the stud 20 and resting upon the pawl plate 14 is a ratchet cam 41, which receives a step by step rotary movement from the upturned end 138 of pawl 13 extending through a slot in plate 14 and engaging in turn the notches 137 of ratchet 41 and which operates the vibrator 56, which has its support on the pawl plate and is pivoted on the pin 51 of the L-shaped member 52.

The base plate 1 is further provided with a cut-away portion 43 in which is located a linked member 44 having a slot- 45 and a circular opening 46 which fits the head of the screw 27 which acts as a pivot. Secured to the forward end of the linked member 44 by a pivot is a link 47 with an upturned. end 48, which is tapped for the screw 49 which passes through a hole in the ear 3 and is provided with a lock nut 50. By turning the screw 49 to pull or push the link 47. the slot 45 can be made to line up perfectly with the needle and the stud 20 and held in this position by the lock nut 50. The slot 45 is for receiving the bottom end of the pin 51 of the Lashaped member 52. which is provided with a slot 53 for adjusting it upon the base plate 1 by the screw 54, and it is provided with an upturned ear for adjusting it while the screw 54: is loose. The pin 51 is tight in the member 52 and its upper end forms a pivot for the vibrator 56, which is connected thereto by the hole 57 in the ear 58, and when assembled the ear 58 is capable of passing wider the pawl 13 and pawl plate 14:, while the yoke 59 straddles the ratchet cam and rests upon the pawl plate 14. The L-shaped member 52 is to regulate the width of bite of the overstitch which is made by the throw transverse movement of the work clamp, by moving the member 52 so that the pin 51 is moved to and from the stud 20. vThe nearerthe pin 51 is to vthe stud 20 the greater the movement of the work clamp. r

The vibrator 56 is provided with a pivoted block 60 which fits the inner faces of the rear yoke 62 of the work clamp 63, which straddles the stud 20 and rests on the supporting plate 61, which, working in con junction with the cam member 30, keeps the forward part 641 of the work clamp in proper contact with the baseplate 1 and prevents the bottom stripper plate 65 from leaving the slotted way 66 in the base as it is oscillated by the work clamp in connection with the ears 67.

Thesupporting plate 61 is held in position by resting ontheshoulders 68 of the bottom 1 part of the stud 21, which fits the hole 69 provided with slots through which pass the extensions 25 of the upper part 22 of the stud 20 and prevent plate 61 from turning and causing the springs 29 to act as friction brakes on the cam member 30. The screw 27 pulling down on the part 22 pinches the plate 61 between the shoulder 68 and the part 7 0 of the-upper part 22 of the stud.

Mounted upon the yoke 62 is the guide or shield 71 for the knife carrier 72, -having its front end 73 in the form of a stripping plate which slides in a groove or space 74 formed by a plate. 75, which is forced into the upper jaw 76 of the work clamp. The rear end of the shield 71 is enlarged, forming a guide 77, by means of the downwardly extending flanges 78 fitting the yoke 62, which moves back and forth relatively to the stud 20. The rectangular opening 7 9 is of a width equal to the diameter of the upper part 22 of the stud 20, which passes through it and prevents the shield from moving back and forth but allows its rear end to be drawn laterally of the stud 20 in both directions by the pin 80 working in the cam groove 81 formed by the cams 82 and 88 on the under side of thecam member 30 (thus causing the vibrator to vibrate or oscillate the work clamp in the contour of a button-hole while the revolving disk is moving the work clamp back and forth the length of the button-hole).

Mounted upon the guide or shield 71 is the knife carrier 72, which has its spring portion 84 passing through the openings 85 and-86 of the shield 71. The spring portion 8 1 has its outer end bent upward, with two cars 87 forminga pair of jaws for the knife 88, which is held by a pin or screw 89. The rear end of the spring portion8 l is formed in a rectangular frame or yoke 90 having a flange 91 forming a cam face 92 against which the cam 93 secured to the under face of the cam member 30 works, and the flexible portion 9 1 insures the keeping of the cam 93 and the cam face 92 always in contact. At a predetermined point the flange 91 forming the cam face 92 is cut away or ends at 95, and the yoke is so formed at this point as to havea clearance space 96 to prevent the yoke frame from hitting the cam 93 when the flexible part 9 1 of the yoke causes the yoke and knife 1 to move quickly back between the strokes of the needle and thus prevent the needle bar from striking the knife several times while it is being moved back from under I the needle bar. caused by the cam 93,v.*hich holds the yoke forward for the proper time, having an abrupt drop 97, so thatwhile it is revolving on the stud 20 the point 98 passes the point on the cam 92. formed as to not interfere with the point 92 and this allows the yoke to move back its full stroke at this point, which is ac- This quick movement is J The point 98 is so complished on one of the upward strokes the intersection of its axes to the rear of the v stud 20. The revolving of the diskrin an oval path is caused by its pivot pin 103 sliding or shifting its position in the slot 104 as disc 102 revolves. The shifting of the pin is caused by the pivoted block 105 sliding in the shallow arc-shaped slot 106.

It will be noted that the slot 10% is deeper than the arc-shaped slot 106; and thus the pm 103 is prevented from entering the slot 106 as it passes the slot 106 when the disk 102 is being driven by the driving plate 101,

which is operatively connected to the disk 102 by the pivoted block 107, which is free to slide in the slot 108 of the driving plate.

The foregoing movement will be more clearly understood by referring to Fig. 3, where I have indicated by dotted lines the positions of the pivoted blockand pin and the starting position of the driving platefor eachcycle. To make a button-hole, with the plate.

driving plate in the position indicated in dotted lines 109, the block 107 will be at 110 and the pivot pin 103 at 111 and block 105 at 112. Vihen the driving plate reaches the position indicated at 113 the block 107 will be at 114: and its center will represent the end of the minor radius of the oval and the block 105 will be at 115 and the pivot pin 108 will be almost in the center of the cam While the driving plate is moving to the position shown in full lines the pivot pin 103 moves along the slot 104 to 116 and the block 105 returns to the center line of the cam plate, and as the driving plate continues its circular movement to the position 109 the block 105 moves over to 117 and back to the center line of cam plate. Mounted upon the revolving disk is an adjustable cam 118 held in position by astud 119 having a rectangular head 120 which fits the recess 121 and which guides it in its movement. The stud passes through a slot 122 and the cam into a screw cap 123, which causes the cam 118 to bind against the disk 02. This cam moves in an oval path, and the lengths of the axes are changed by the adjustment of the cam on the disk 102 relative to the pin 103. It will be understood from the foregoing that the reason the cam 118 moves in an oval path instead of an ellipse is that the slot 106 is arc-shaped, and having its center towards the front of the attachment causes the pin 103 to be moved to and from the center of the cam plate much faster on the first and last quarters of its revolution and much slower on the second and third quarters of its revolution. This is due to the block 105 moving partially in the same direction with the pin 103 and also to the side and back to the center at the same time on the first and last quarters of the revolution, thus forming the pointed end of the oval, and the block 105 moving in the opposite direction to the pin 103 relative to the major axis or" the'oval, while returning'on the arc to the center of the cam plate on the second and third quarters of its revolution thus forms the circular or butt end of the oval, as indicated by the dotted line 153 in Fig. 3. By the, term oval is to be understood a figure similar to an ellipse, but in which the curvature at one end is greater than at the other end, similar to the shape of an egg. The cam 118 performs the function of the eccentric cam of the patents mentioned in this specification and produces a more satisfactory result.

' The cam 118 moves the work clamp forward and back from the stud 20 and in line with the needle through the yoke member 12 1, which is secured to the work clamp and is provided with a slot 125 in. which the cam 118 is located, and as the cam revolves it works against the face 126 first to drive the clamp forward and against the face 127 to draw the clamp back. The yoke member 12 1 is secured to the work clamp 63 by means of screws 128, and the forward end is bifurcated and bent so as to form bearings for the locking member 129 which is formed of a bent wire having a central portion 130 which acts in the capacity of a hand lever to operate the two end portions 131 which act upon the spring extensions 132 of the upper jaw 63 and which are riveted to the rear yoke 62 of the work clamp.

Mounted on the underside of the base plate 1 (see Figs. 8 and 9) is a spring member 133, which is held in position by the rivets 131 and has an upwardly extending portion 135 which extends through the opening 136 of the pawl plate 1 1 and into the holes 137 of the ratchet cam 11. This prevents the ratchet cam from being turned backwards by friction of the end 138 of the pawl slipping out of any one of the holes 137 upon its backward movement after it has revolved the ratchet cam one-tenth of a turn.

The base plate is further bent or formed so as to have a raised portion 139 through the center thereof, upon which the bottom of the work clamp slides and on which is cut the channel or groove 66 for the stripperplate 65, which has an opening 140 somewhat in the shape of a T. Beneath the stripper plate 65 in the base plateis an opening 111 to allow the needle to perform its functions. The raised portion 139 forms a channel or groove 1 12 (see Fig. 10), which allows the free action of the feed dogs of the sewing machine and raises the device enough to permit the cutting of the cloth without the knife hitting the dogs on itsdownward stroke.

The operation of the device is very simple. The rear throat plate of the sewing'machine is removed and the device is slipped in its place by the insertion of the throat plate 2 which is screwed to the device. and the shank of the screw which holds the needle in position passes into the bifurcated end 6 of the lever 41. When the attachment is first put on the machine the screw 54% and lock nut 50 are loosened and the screw 19 turned to bring the knife in line with the needle. The lock nut 50 is then tigh ened up. This holds the slot 15 in a perfect line with the needle and then the member can be adjusted for any width of vibration for the work clamp. The screw 51 is then tightened and the attachment is ready for operation. It will be understood that after the knife has been once adjusted for the needle the attachment can be removed if desired and 7 put back without the knife being readjusted, and th vibrating movement of the work clamp can also be changed to take more or less bite when the attachment is adjusted to make a larger or smaller button-hole, without disturbing the adjust.- ment of the knife.

To make a button-hole, the work clamp is Lil set by operating the sewing machine until the extreme back position is reached. The lever 130 of the locking member 129 is then pressed forward, (that is, in the direction of the needle), and forces the ends 131 backwards and thus relieves the pressure of the springs 132, which allows the jaws of the work clamp to open. The cloth is inserted between the jaws and the lever 130 pushed back to its original position, thus causing the upper jaw to force th cloth down into the concave opening in the lower jaw, and at the same time the flanges 1&3 of the up per jaw prevent the slipping of the cloth on the lower 'jaw and thus causes the cloth to be stretched like a drum head. With the work clamp in this position the knife is in the dotted position shown in Fig. 5, and upon running the machine the needle bar strikes the top of the knife and forces it through the cloth each time the needle descends, until the work clamp is almost at its xtreme forward position, when the cam 93 is at the point where the point or nose 98 passes the point 95. The flexible portion 94: of the yoke causes the yoke to move swiftly back and draw the knife out of line with the needle bar before it has time to descend and strike it again, (asshown in full lines in Fig. 5), thus preventing further cutting, and the knife remains in this position until the button-hole is finished.

The stud 20 is the pivot center upon which the work clamp is oscillated by the vibrator 56. With each upward movement of the needle bar the lever a is raised, which in turn swings the pawl plate 14: sutliciently to have the pawl. 138 act on one of the holes 137 of the ratchet cam and revolve it one-tenth of a revolution, which causes one of the pointed cam faces 14:3 to act on one side of the yoke 59 and cause the vibrator to swing to one side of its pivot 51. The face 14% prevents any overthrow of the vibrator. The next stroke of the needle causes one of the faces 113 to act on the opposite side of the yoke 59 and swing it in the opposite direction. This movement of the vibrator causes the work clamp to be oscillated on its pivot 20, such motion being transmitted through the block of the vibrator. While the vi brator is oscillating the work clamp in one direction or the other with every stroke of the needle to make the needle pass first through the cloth and then through the cut, the oval cam is. slowly shoving the work clamp forward the length of the button-hole, the speed of the forward movement being regulated by the screw 8, which strikes the arm or lever 36 of the friction clutch and forces the ring 31 back a predetermined amount, (upon the downward stroke of the needle). The rear end 10 of the slot 7,

upon reaching the arm 86, (on the upward movement of the needle) forces the ring'to move forward and the nose 38 to bite into the cam member 30 and cause it and the revolving disk to revolve, which causes the the revolution of the revolving disk, works against the face 127 it causes the work clamp to be drawn backwards. The revolving of the cam member 30 causes the pin 80 to shift its position while the button-hole is being made. This is due to the pin 80 being held relative to the stud 20 by the groove 81 and in the start is in the portion 145 which forms a part of the back end of the buttonhole, that is, the part which is furthest from the edge of the garment. The part 146 holds the pin in a position sothat the vibrator will vibrate the work clamp up one side of the slit which is being made by the knife for the buttonhole. The part 147 then causes the pin 80 to move nearer to the stud 20, and this causes the first part of the loop or eyelet to be made, and the part 1 1-8 causes the pin 80 to move the farthest away from the stud, and this causes the semicircular end of the eyelet to be made. The part 149 causes the pin 80 to move near to the stud, and this causes the completion of the eyelet. The pin is then held in position by the part 100' until the vibrating of the work clamp down the other side of the slit completes the button-hole by the pin going to its original position in the portion 1&5. This operation forms what is known by the trace as the eyelet or looped button hole. It will be noted that the cam member 3i) revolves an equal distance at each stroke of the needle, and if the cam 118 were attached directly toth-e cam member 80 the camllS would move in a circle and would pile up too'many stitches at the end and make a defective button-hole; but by having the cam move in an oval path, this is obviated. Of course it is desirable to have the stitches a little closer at the back end than on the side, but not to the extent which would be produced if the circular movement were used.

By ri-ferring to the diagrammatic Figs. 36 and 3?, it will be seen more clearly the advantages gained by the cam 118 moving in an oval path instead of the circular path. In these two views I have indicated by the dotted lines 150the movement of the cam member 30 for every ten strokes of the needle or for every ten stitches, and the point where each dotted line 150 touches the semi-circle 151 indicates where the cam 118 would be; for instance, after the first ten stitches it would have moved from a to b and the second ten stitches from Z; to 0 and so on un'til after a hundred and. twenty stitches it would be at m and the first half of the lmton-hole would be'finished, and the reinc Ill?) verse movement would under the same conditions, while the cam 118 is completing the circle, complete the button-hole. The vertical lines 152 represent the forward movement of the cam 118 and the horizontal lines the work clamp, and the vertical lines 154 represent the forward movement of the work clamp. It will be noted that all of the lines 153 are exactly the same length in both figures, and when the cam 118 moves from a to b ten stitches are crowded into the space between a and 0, and when it moves from Z) to a ten are made in the space from 0 to p, and so on, and as the cam 118 HIUVGS from a to g each of the spaces 155 from n to 25 increases in length and thus it will be seen that entirely too many stitches are crowded into the space from n to 0 and 0 to 72 while from g) to g the stitches would be normal and Q to r would not. have sulficient stitches, and r to s and e to t entirely too few, and the exact reverse condition would exist while the cam 118 is moving from g to m and the clamp from t to (thus it will be seen that the circular movement gives a very uneven stitching of the lnitton-hole by piling up too many stitches at the back end and entirely too few at the eyelet ench as the distance of travel or space is greatly increased by the curvature of the eyelet. It will be noted that the work clamp needs to be retarded at the eyelet end in order to allow more stitches to be made while the eyelet is being formed, and l accomplish this by having the cam 118 move in an oval path and by having the minor axis of the oval to the rear of the center of the stud 20, as will be seen by referring to Figs. 3, 19 and 37. It will be noted that the cam 118 follows an oval path, indicated by the line 158, and when the cam member 30 moves from a to b the cam moves from (L to 7), and when the cam member has moved to c the cam has moved to c, and so ion and the clamp has moved from 'n/ to 0 while the cam member has moved trom a to b and the cam from a to 7/, and so on. ll will be noted that the spaces n t- 0 are suitable for the back end and the space 22 is almost normal and the spaces w and f to 1* are normal, and the spaces r s to 3 -.2' are gradually shortened in order to compensate for the increased travel or lengthened space to be stitched while the eyelet is being formed and the work clamp at this point is moving in a line forming a compound curve instead of a straightline, and the retarding of forward movement allows the sewing machine to supply sullicient stitches to make the eyelet have the proper number of stitches to compare with the sides of the button-hole. It is understood that the formation of the other side of the button-hole is the exact reverse OTE the movements shown in the diagrams and that the the work clamp relative to the needl and the stud of the attachment, it being under stood that the back end of the button-hole is the beginning of the operation and also the ending of the operation and thatthe back end is made while the wornclamp is moving forward from 'n to 0 and the sides from o to s and the eyelet end from s to .2, or in other words in the operation of making button-hole the work on the button-hole is always in the reverse direction to the movement or" the work clamp. it will be under stood that I have stated for convenience of illustration that ten stitches are made between each ot' these divisions; but by regulating the screw 8 any number of stitches can be made between the divisions; and from the foregoing it will be clearly seen that the oval movement places the stitches very evenly along the sides of the button-hole and does not overcrowd the ends too much, as the space between a and 0 is greater than between it and 0.

I claim as my invention:

1. In an attachment of the character stated, the combination oi stitching mechanism including a needle, a workclamp. driving means capable 01 travel in an oval path connected with the work clamp for working the same bacand forth in line with the needle, and means adjustable for varying the major and the minor axes of said oval path of said driving means.

2. In an attachment of the character stated, aneedle, means for cutting a but ton-hole in advance of the stitching mechanism, a work clamp means capable oi travel in an oval path connected with the work clamp for moving the same back and forth with respect to the stitching mechanism in line with the needle whereby a button-hole is so formed that the stitches are substantially evenly distributed throughout its extent.

3. In an attachment of the character statech the combination of stitching mechanism including a needle bar and its needle, n'ieans tor clan'i iing work lauh means capable of travel in an oval, path connected with said work clamp for moving the same back and forth with respect to the stitching mechanism in line with the needle, a flexible endwise movable member for supporting a cutter above the work and a cutter lined to said member for slitting the work as said member is flexed by the needle bar in advance of the stitching operation.

4. An attachment as described in claim 1, characterized by means for so oscillating the work holder as to cause the stitching mechanism to pass a thread first through the work as incised and then. through the incision and so on to provide a substantially uniform overstitching or binding for the raw edge throughout its extent, and means for regulating the width or bite of the overstitch.

5. In an attachment of the character stated, the combination of stitching mechanism including a needle, a work clamp, a stud, a cam member having a driving plate rotatable therewith, a cam plate mounted upon the stud working in conjunction with the driving plate, a disk operable by the driving plate so as to move in an oval path with respectto the stud and having its minor axis disposed transversely to the work clamp, and a cam connected to said work clamp and operable by'said disk for movement in an oval path for reciprocating the work clamp in line with the needle.

6. An attachment as described in claim 5 characterized by the cam plate having a slot therein formed upon an arc of a circle and a block pivoted to the disc slidable in said slot.

'7. An attachment as described in claim. 5 characterized bymeans for changing the lengtlis of axes of oval movement of the said cam.

8. An attachment as described in claim 6 characterized by said cam operable to move in an oval path through the instrumentality of said arc-shaped slot in the cam. plate being so positioned as to have its center toward the front. of the attachment and a pin 103 that is caused to move to and from the center of the cam plate faster upon its first and last quarter turns than upon its second and third quarter turns.

9.An attachmentas described in claim 5 characterized by a ratchet cam mounted, upon the stud, a pawl plate for advancing the ratchet cam, and means connecting the work clamp with respect to the ratchet cam for vibrating said clamp.

10.. in attachment as described in claim 9 characterized by means for preventing backward throw of the ratchet cam.

11. An attachment as described in claim 10 characterized by the ratchet cam havinq a determined number of projections to v1- brate the work clamp and double that number of pawl-engaged faces.

12. An attaclunent as described in claim 5 characterized by acutter carried by the work clamp for making an incision in advance of the stitching mechanism, and means for positively moving the cutter in two directions.

18. In an attachment of the character stated, the combination with a frame and a work clamp mounted to reciprocate thereon andto vibrate laterally, of a stud, a ratchct cam mounted on the stud and having a central perforation and ten perforations in a circular series around the center, the periphery of the cam having five faces meeting to form five points, advancing means arranged to engage the cam at said perforations to turn the cam step by step,

I means connected to the work clamp and encam mounted on the stud and having a central perforation and ten perforations in a circular series around the center, the periphey of the cam having five faces meeting to form five points, advancing means arranged. to engage the cam at said perforations to turn the cam step by step, means connected to the work clamp and engaging said cam periphery to vibrate the work clamp, means for preventing any backward throw of the perforated cam, and means capable of travel in an oval path connected with the work clamp for moving the same back and forth with respect to the stitching mechanism.

15. In an attachment of the character stated, the combination with a frame and a work'clamp mounted to reciprocate thereon and to vibrate laterally, of a. stud, a ratchet cam mounted on the stud and having a central perforation and ten perforations in a circular series around the center, the periphery of the cam having five faces meeting to form five points, 1 advancing means arranged to engage the cam at said perforations to turn the cam step by step, means connected to the work clamp and engaging said cam periphery to vibrate the work clamp, means for preventing any backward throw of the perforated cam, means for shifting at'certain periods the pivot of the work clamp to form a button-hole with an eyelet end, and means capable of travel in an oval path connected with the'work clamp for moving the same back and forth with. respect to the stitching mechanism.

16. In an attachment of the character stated, the combination with a frame and a work clamp mounted to reciprocate thereon and to vibrate laterally, of a stud, a ratchet cam mounted on the stud and having a central perforation and ten perforations in a circular series around the center, the periphey of the cam having five faces meeting to form five points, advancing means arranged to engage the cam at said perforations to turn the cam step by step, means connected to the work clamep and engaging said cam periphery to vibrate the work clamp, means for shifting at certain periods the pivot of the work clamp to form a but-- ton-hole with an eyelet end, and means capable 'of travel in an oval path connected with the work clamp for moving the same back and forth with respect to the stitching mechanism.

17. In an attachment of the character stated, the combination with a f nine and a work clamp mounted to reciprocate thereon and to vibrate laterally, of a stud, a ratchet cam mounted on the stud and having a central perforation and ten perforations in a circular series around the center, the periphery of the cam having five faces meeting to form five points, advancing means arranged to engage the cam at said perforations to turn the cam step by step, means connected to the work clamp and engaging said cam periphery to vibrate the work clamp, means for preventing any backward throw of the perforated cam, means for shifting certain periods the pivot of the work clamp to form a hutton hole with an eyelet end, means for increasing or decreasing the over-stitch or the lateral throw of the work clamp, and means capable of travel in an oval path connected with the work clamp for moving the same back and forth with respect to the stitching mechanism.

18. In an attachment; of the character stated, the combination with a frame and a work clamp mounted to reciprocate thereon and to vibrate laterally, of a stud, a ratchet cam mounted on the stud and having a central perforation and ten perforations in a circular series around the center, the periphery of the cam having five faces meeting to form five points, advancing means arranged to engage the cam at said perforations to turn the cam step by step, means connected to the work clamp and engaging said cam periphery to vibrate the work clamp, means for preventing any back ward throw of the perforated cam, means for shifting at certain periods the pivot of the work clamp to form a button-hole with aii'eyelet end, means for adjusting the vibrator relative to the stud and needle, and

means capable of travel in an oval path connected with the work clamp for moving the same back and forth with respect to the stitching mechanism.

19. In an attachment of the character stated, the combination with a frame and a work clamp mounted to-reciprocate there on and to vibrate laterally, of a stud, a ratchet cam mounted on the stud and having a central perforation and ten perforations in a circular series around the center, the periphery of the cam having five faces meeting to form five points, advancing means arranged to engage the cam at said perforations to turn the cam step by step, means connected to the work clamp and engaging said cam periphery to vibrate the Work clamp, means for preventing any backward throw of the perforated cam, means for shifting at certain periods the pivot of the work clamp to form a button-hole with an eyelet end, means for adjusting the vibrator relative to the stud and needle, means for regulating the length of the button-hole, said regulating means being apable of travel in an oval path connected with the work clamp for moving the same back and forth with respect to the stitching mechanism.

20. In an attachment of the character stated, the combination with a frame and a work clamp mounted to reciprocate there'- on and to vibrate laterally, of a stud, a ratchet cam mounted on the stud and having a central perforation and ten perforations in circular series around the center, the periphery of the cam having five faces meeting to form five points, a pawl plate. on said stud arranged to engage the cam at said perforations to turn the cam step by step, means connected to the work clamp and engaging said cam periphery to Vibrate the work clamp, and means capable of travel in an oval path connected with the work clamp for moving the same back and forth with respect to the stitching mechanism.

21. In an attachment of the character stated, the combination with a frame and a work clamp mounted to reciprocate thereon and to vibrate laterally, of a stud, a ratchet cam mounted on the stud and having a central perforation and ten perforations in a circular series around the center, the periphery of the cam having five faces meeting to form five points, a pawl plate on said stud arranged to engage the cam at said perforations to turn the cam step by step, means connected to the work clamp and engaging said cam periphery to vibrate the work clamp, means for preventing any backward throw of the perforated cam, and means capable of travel in an oval path connected with the Work clamp for moving the same back and forth with respect to the stitching mechanism.

29. In an attachment of the character stated, the combination with a frame and a work clamp mounted to reciprocate thereon and to vibrate laterally, of stud, a ratchet cam mounteo on the stud and having a central perforation and ten perforations in a circular series around the center, the periphery of the cam having the faces meeting to form five points, a pawl plate on said stud arranged to engage the cam at said perforations to turn the cam step by step, ieans connected to the work clamp and engaging said cam periphery to vibrate the work clamp, means for preventing any backward throw of the perforated cam, means for shifting at certain periods the pivot of the work clamp to form a button hole with an eyelet end, and means capable of travel in an oval path connected with the work clamp for moving the same back and forth with respect to the stitching mechamsm.

23. In an attachment of the character stated, the combination with a frame and a work clamp mounted to reciprocate thereon and to vibrate laterally, of a stud, a ratchet cam mounted on the stud and having a central perforation and ten perforations in a circular series around the center, the periphery of the cam having five faces meeting to form five points, a pawl plate on said stud arranged to engage the cam at said perforations to turn the cam step by step, means connected to the work clamp and engaging said cam periphery to vibrate the work clamp, means for shifting at certain periods the pivot of the work clamp to form a button-hole with an eyelet end, and means capable of travel in an oval path connected with the work clamp for moving the same back and forth with respect to the stitching mechanism.

24. In an attachment of the character stated, the combination with a frame and a work clamp mounted to reciprocate thereon and to vibrate laterally, of a stud, a ratchet cam mounted on the studand having a central perforation and ten perforations in a circular series around the center, the periphery of the cam having five faces meeting to form five points, a pawl plate on said stud arranged to engage the cam at said perforations to turn the cam step by step, means connected to the work clamp and engaging said cam periphery to vibrate the work clamp, means for preventing any backward throw of the perforated cam, means for shifting at certain periods the pivot of the work clamp to form a button-hole with an eyelet end, means for in- I creasing or decreasing the overstitch or the lateral throw of the work clamp, and means capable of travel in an oval path connected with the work clamp for moving the same back and forth with respect to the stitching mechanism.

25. In an attachment of the character stated, the combination with a frame and a work clamp mounted to reciprocate thereon and to vibrate laterally, of a stud, a ratchet cam mounted on the stud and having a central perforation and ten perforations in a circular series around the center, the periphery of the cam having five faces meeting to form five points, a pawl plate on said stud arranged to engage the cam at said perforations to turn the cam step by step, a vibrator connected to the work clamp and engaging said cam periphery to vibrate the work clamp, means for preventing any backward throw of the perforated cam, means for shifting at certain periods the pivot of the work clamp to form a button-hole with an eyelet end, means for adjusting the vibrator relative to the stud and needle, and means capable of travel in an oval path connected with the work clamp for moving the same back and forth with respect to the stitching mechanism.

Signed at New York, in the county of New York and State of New York, this 8th day of February, A. D. 1918.

ALBERTUS B. MATTINGLY.

Witnesses:

CHAS. W. LA RUE, WALTER H. HUSTED.

Images