US1422639A - Stop motion for shoe-sewing machines - Google Patents

Description

F. E. VALOIS.

STOP MOTION FOR SHOE SEWING IVIACHINES..

APPLICATION FILED JULY 31,1916.

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'LQL22,69, Patented July 11, 1922.

3 SHEETSSHEET 2. 7f 75' j I INVENTQY:

m WW Urr'so STATES PATENT OFFICE.

FELIX EMILE. VALOIS OF HAVERHILL, MASSACHUSETTS, ASSIGNOR TO HAMEL SHOE MACHINERY COMPANY, OF LYNN, MASSACHUSETTS, A CORPORATION OF MASSA- CHUSETTS.

STOP MOTION FOR SHOE-SEWING MACHINES.

. Specification of Letters Patent. Patented Ji ly 11, 1922,

Application filed July 31, 1916. Serial No. 112,230.

T oil whom it may concern:

Be it known that I, FELIX EMILE VALoIs,

a citizen of the United States, residing at Haverhilhcounty of Essex, State of Massachusetts, have invented a certain new and .useful Improvement in Stop Motionsqfor Shoe-Sewing Machines, of which the following 1s a specification, reference being had therein to the accompanying drawings.

My invention relates to a stop motion for use on sewing machines of various kinds, and particularly shoe sewing machines such as welt, turn or outsole stitchers, to relieve the operator of the workv of stopping the machine by hand at the proper position in its cycle of motions.

Shoe sewing machines as heretofore constructed have ordinarily been provided with a hand wheel by which the operator stops the machine and by which he turns the machine backward or forward to separate the stitch forming instrumentalitiesand permit the work to be inserted or removed; also to permit the thread to bedrawn out before beginning to stitch another shoe. This makes it necessary for the operator to use one hand to stop and turn back the machine and consequently delays him in his work.

My present invention provides an' automatic mechanism by means of which the machine will be stopped when the foot treadle by which the operator controls the machine is released; The machine will be stopped quickly even when running at low speed and will come to rest with the stitch forming instrumentalities in. separated pos1t1on ready for the insertion or removalof the work. a The machine also operates automatically'to release the tension on'the thread so that the thread may be drawn out more easily. It is also arranged so that the stitch forming instrumentalities will skip a stitch just as the machine stops:

The general mode of operation of the machine embodying my invention differs fundamentallyv from devices of a similar character which have heretofore been em-' ployed. Heretofore, the stop motion has acted first to slow down the machine from the high speed at which the'machine runs during the stitching operation to alow speed, thereafter bringing the machine to rest at a predetermined.- point While the machine 'still in the work.

is being driven at low speed. The result has'been that an unnecessarily -large proportion of the time has been consumed in stopping and turning back the machine to separate the stitching instrumentalities. This has sometimes been accomplished by having high speed driving mechanism and a low speed driving mechanism, and the stop motion acts to .change the drive from high speed to low speed, and then to stop the machine.

In a machine embodying my invention, the stop motion first operates to connect the machine so that" it will be operated at full speed during the formation of the last stitch, then disconnects the driving mechanism and stops the machine. If for instance the operator wants to stop the machine after sewing some portion of the work which requires to be sewn slowly, the stop motion first puts the machine into high speed for a single stitch and then stops it in the pre-,

determined position in the cycle of operamotion may be disconnected by moving a 1 single lever, and thereafter the machine can be operated by the hand wheel as. inthe ast.

It is possible also to stop .the mac ine by letting upthe treadle enough to disconnect the driving clutch but not enough to set the stop motion in action,-the machine under these conditions stopping by loss of momentum with the stitching instrumentalities This is convenient for many reasons as-it gives the operator a It also permits the use of the ma-:

the stitching until he reaches the starting point, when he will release the treadle and the stop motion will stop the machine. The machine is also capable of other special uses which need not be described.

In the following description, I have describedmechanism by means of which the stitching instrumentalities namely, the

needle and looper are separated when the machine is stopped to facilitate the inser-- tion or removal of the work. This is accomplished by mechanism acting upon the needle. I do not limit myself, however, to this construction since it will be obvious to those skilled in the art that it is only necessary that the needle and looper be separated sulficiently. I have also shown my device as applied to a shoe sewing machine because that is the way in Which'I have put the device into actual use, but I do not limit myself to this application of it since it is capable of use in combination with other machines.

The invention will be fully understood when taken in connection with the accompanying drawings and the novel features thereof will be pointed out and clearly defined in the claims at thej elose of this specifi- I is necessary for an understanding of theofthe devices shown in cation. Y

In the drawings, Fig. 1 is a front elevation of mechanism embodying my invention, certain parts being in section and only so much, of the sewing machine being shown as fshown, at A, the frame of the machine, at

B the main driving shaft, at C the driving pulley and at D a hand wheel, said hand wheel being fast to the main shaft B. Interposedbetween the driving wheel C and the hand wheel D is a leather disk 11 fastened to the face of the hand wheel or of the driving wheel. It will, therefore, be "understood that when the driving wheel C is moved to the left, thehand wheel D and main shaft B will. be caused to rotate by frictional contact. At E is shown the needle .(seeFig 3) and atF the looper. 'Theneedle-is mounted on the oscillating needle sector .Gfwhich is operated by the cam H throuh the bell crank. lever L and curved link I At P is shown the treadle by means I of which the machine is controlled by the operator. The treadle P is connected by a chain or wire M to the lower end of a treadle crank L by means of which the needle sector G is oscillated. When the treadle P is depressed, the eccentric 18 is rotated so that the axis of oscillation of the bell crank L is in proper position for the running of the machine. When the treadle bar is in its upper position, this being just before the automatic stop motion stops the machine, the eccentric 18 changes the position of the axis of oscillation of the bell crank L so that the needle E is drawn away from the looper F just enough so that thelooper will lay the thread across the point of the needle instead of laying it under the barb of the needle. This makes the machine skip the last stitch. The eccentric is so positioned on the shaft 17 that the axis of oscillation will not be moved appreciably by the first part of the upward movementof the treadle bar, the effective movement taking place just before it reaches the top of its stroke. By this means the treadle bar may be moved sufficiently to control the speed of the machine without-causing it to skip a stitch except when the treadle bar is allowed to move its full stroke. v

The upper end of the treadle bar 13 is provided with a roll 19 which rests on a hard wearing surface 20 formed on the end of an arm. 21 of, a rock shaft 22. Thisrock shaft has two arms 23 and 24 carrying rolls 25 which form a clutch shifter and which are located in a groove 26 of the clutch huh 27 of the driving wheel C. When the 'treadle P is depressed, this mechanism pushes the hub 27 to the left as seen in Fig. 1, and produces a frictional engagement sufficientvto drive the hand wheel D and thus the machine. For convenience, these parts may be referred to as the variable speed clutch.

The pressure exerted on the treadleP by the operator will regulate the speed of the machine. The greater theressure, the faster the machine will run until it is revolving at the same speed as the main driving wheel C. The treadle bar 13 is held'up by a spring 93 which is strong enough to ift the bar and attached parts; As will be explained more fully later, the treadle bar actuates the stop motion, but the treadle bar has a range of -motion sufiicient' to vary the speed of the machine from full speed, down to a point where the clutch is disengaged and they machine can stop by loss of'momentum, the purpose being to mak'e itpossible for-"the workman to run the machine at any speed maacs e or even to stop it by hand in' the oldway without the interposition of the stop motion.

Thetreadle bar 13 is provided on its side edge with a notch 28 withinwhich is received the end of a finger 29 formed on a lever 30 pivoted at 31 to the frame of the machine. The finger 29 is guided in a slot formedin-the cover 14 in which the treadle bar slides. The lever 30 carries a small roller 32 moving in. a cam slot 33 formed in a cam 34 located on the main shaft B. A spring 94 holds the roller 32 in contact with the cam 34. This cam roll operates to move the lever -30 and withdraw the finger 29 from the notch in the treadle bar so that the treadle bar can be movedab'ove a predetermined pointonly'when the main shaft is in a certain position. This preventsthe machine being automatically stopped until the next revolution in case the thread has already been laid in the barb of the needle at the time when the operator releases the treadle. The upper edge ofthe notch 28 in the treadle bar is rounded or inclined so that the treadle bar can be pulled down-by the treadle even when the finger 29' is inthe slot but whenever the finger is in the notch it will prevent the treadle bar being raised above the predetermined point. I

On the main shaft B is located the cam H by which some of the stitching instrumentalities are operated. The periphery of this cam serves as a brake wheel and is engaged by a brake 36 which is operated by the stop motion in a manner which will be described hereafter. There is also located on the main shaft B, a stop cam 37 having a hub 38 (see Fig. 3) which acts as one member of a roll clutch of the well known Horton type represented, for example, in U. S. Patent No. 260,-,- 394, ofJuly 4, 1882, the outer member being designated 27 and the intermediate member or roll carrier being designated 39.- For I convenience this clutch may be referred to as the full speed clutch. When the clutch hub 27 on which the drive wheel C is mount- .ed is moved to the right as shown in F ig; 1, it engages the face 39 of the roll carrier 39 of the full speed clutch and advances the roll '90-- relative to the hub 38, carrying them into ,wed ing engagement between the inclined surfaces 91 of the hub 38 and the internal cylindrical driving sur- -39"and. the hubs 27 and 38 are'knocked apart. The roll carrier is provided on its exterlor with a tooth 48 which assists in effecting the knocking apart of the roll carrier and the hubs. I

The stopping of the'machme is effected by a swinging stop lever pivoted oif'trunnions 41, 42 to the 'frame of the machine. A

spring 43 exerts a pressure on the upper end E 44 which surrounds a pin 49 which also serves as a' cam follower and carries'a collar 45 against which the upper end of the spring 44 rests. The collar '45 is provided with an arm 54 which extends sideways through a Slot in the side of the stop lever 40. The upper end of the spring pin or cam follower 49 protrudes through the upper end of the stop lever. The stop lever 40' also has an arm or projection 46 protected by a hardened steel face 47. This arm or projection 46 is located so that it may be swung into the path of the tooth 48 on the roll carrier 39 of the full speed clutch. The stop lever 40 also has a tail 50 extending across the the parts. The stop lever is held normallyin this position by means of a latch 52 pivoterl at 53 to the frame of the machine. A spring 92 surrounds the pivot 53 and holds the lower end of the latch 52 to the left as seen in Fig.1.

The lower end of the latch 52 is normally in the path of movement of the tail 50 Fof the stop lever and, therefore, holds the spring 43 compressed and the upper end of the stop lever to the right as shown in Fig. 1 until the latch is moved to release the parts.

When the treadle is released and--the treadle bar 13 is pulled up by the spring 93, the roller 51 strikes a cam surface I) on the latch 52 and pushes it aside so that the spring 43 is then free to act and push the stop lever 40 toward the cam 37. The upper end of the cam. The sha e of this cam will be.

clearly seen from 'igs. 4 and 5. There is an inclined surface 0 on the end face which runs into a cut away portion d on the edge of the cam and this is followed-by a high spot e also on the edge of the cam. A short distance beyond thishigh spot is a deep notch f. The result of this construction is that when the stop lever 40 ,is pushed over by the spring 43 the sideof the pin49 restsagainst the side of the cam 37 so that when it revolves it follows. down the incline 0 still further :to the left until the I movin end 0 the pin rests'on the edge surface -d.-- if 66 the following mechanism; At 40 is shown of the cam; The further movement of the .4) with the hand wheel cam pushes down the spring pin 49 and compresses the spring 44, the full limitof movement of the pin being reached when it is on the high spot 6. Suflicient energy is thus 5 stored in the spring by the cam to actuate the brake, when the spring is released. The further movement of the cam allows the-end of the pin to snap up into the notch f being operated by the spring 44.

36 to the periphery of the cam H which serves as a brake wheel, as will now be described.

The upper end ofthe slide rod 55 which a carries the brake 36 is provided with a notch in which operates a tooth 56 formed on a rock shaft 57 (see Fig. 1.) This rock shaft 57 has an arm 58 to which is connected the upper end of a link 59. The link 59 is connected at its lower end to a bell crank 60. pivoted at 62 to the cover 14 whichis secured to the frame of the machine. The bell crank 60 operates will be described hereafter. The link 59 has near its lower end a pawl 63 pivoted to it at 64. At 65 is shown a stop against which the pawl is normally held b means of a spring 66. The lower end of t e pawl 63 is in the path of the arm 54 when the stop lever is being swung over'by the spring 43. When the pin 49 has been fully depressedby the action of the cam 37, being at that time on the high spot e of the cam, the arm 54 will be under the pawl 63. As soon as theend'of the pin 49 rides over the high spot'e into the notch f, the heavy spring 44 will push up the pawl 63 and-the link 59 on which it is mounted and will actuate the brake 36 through the rock shaft 57. While I have shown and described herein a brake operated 40 by the-spring pin, this is not essential since by properly designing the parts the spring pin itself may be caused to act as a brake by its pressure on the inclined face at and high 7 spot 0 of the cam. l The upward'movement of the spring pin 49 and link 59 also performs other functions.

I The lever 58 is extended beyond its pivot 57 and is provided with an arm- 95 which carries an adjusting screw- 96 which is located over an arm 97 formed on one of the'arms 24'of the. rock shaft. 22. The adjusting screw isv set so'that when the link 59 is moved u by the 'pin 49 in the stop lever '40, it wil contact with the-arm 97 and move therock shaft 22 to slide the hub27 to the left out o'fico'ntact with the face of the roll carrier 39, but not enough to cause it to contact This prevents the hub 27 rubbing against. t e.-roll carrier and caus- --60 i 'undu friction'."

V he thread passes around the tension wheel"70 llooselyymounted; on...a stationary shaft 71, the tension wheel being rotated b the thread. On this shaft is mounted a sli ing hub 7 2- which is prevented from rotation This has the effect of applying the braketension release as" a spline 73 or in other suitable manner.

The hub 72 is normally pressed against the end of the hubof the tension wheel by a spring 74 surrounding the shaft 71 and resting against a thumb nut 98. At 75, 75 are shown felt surfaces forming suitable frictional contacts for the hub of. the tension wheel 70. At 76 is shown one arm of a bell crank lever pivoted at 77 to the frame of the machine, the other arm 78 being forked to engage an annular groove in the hub 72. The arm 76 is bent to extend around certain parts of the machineand is connected by a connection 79 to an eye-bolt 80 which passes through the lower end of the bell crank 60. An adjusting nut 81 on the end of the eyebolt 80 serves to vary the length of "the connection. To enable the operator to use the machine without thestop motion, there is':

provided a small lever 4 which I term the stop-motion cut out which engages a notch 5 in the treadle bar 13. This notch is long enough to allow the treadle bar to be moved enough to operate the variable speed clutch C but when the stop motion cut out is in the notch the spring 93 cannot lift the treadle bar high enough tooperate the stop motion.

The operation of the machine embodying my invention is as follows: It will be assumed that the machine is-running on a shoe,-the treadle P being depressed so that the driving wheel C is in frictional contact with the hand wheel D. It may also be assumed that the pressure on the treadle is light so that there is considerable slip between the drive wheel C and'the hand wheel D andthe machine, therefore is running very slowly and has practically no momentum. {if the operator; desires to stop the machine, he releases the treadle.

When the treadle is released, the spring 93 moves up .the treadle bar until the tail of the bell crank 21 contacts with the hooked end of the tail of the latch 52. As the treadle bar moves up, the finger 29 then snaps into the slot 28 in the treadle bar 13 if the movement of the treadle occurs after the thread has been laid in'the barb of the needle, and the parts are held by the finger 29 from' further movement until the high s 0t 7:. on the cam 34 moves the lever 30 to speed by the position of the treadle. The

finger 29d'oesnot interfere with this movement' because the upper corner of the notch 28in the treadle bar is rounded off. When the finger 29 has been moved by the cam 34 out of the notch 28 in the treadle bar, the

spring 93 can raise the treadle bar and the roll 51 being then in contact with the cam s rface I) on the latch 52, the latch is unsneaaeee hooked from the tail of the bell crank 21 and the spring 85 is thereafter free to move the bell crank. The movement of the bell crank moves the main drive whee-l C out of contact with the hand wheel D and then brings the hub 27 in contact with the roll carrier 39 holding these two parts together so forcibly that the roll carrier 39 is momentarily driven at the maximum speed by the drive wheel C. As soon as the roll carrier 39 revolves far enough, the two rollers 90 are wedged between the inclined surfaces 91 and the cylindrical driving surface 27' and lock the two clutch members 27 and 37 together, whereby the main shaft of the machine is also momentarily driven at the maximum speed;

When the readle bar 13 is lifted up by the spring 93 and the latch 52 is unlocked from the tail of the bell crank 21, it also releases the stop lever 40 so that the spring as push-es the stop lever over to the left as soon as is permitted by the change in position of the inclined surface 0 on the cam 37. Thearm. 46 on the stop lever 40 gets in the path of the tooth. 48 on the roll carrier 39 and stops the movement of the roll carrier disengaging the rolls from wedging relation with the hubs so that from then on the machine is not driven but revolves under its own momentum for about a qharter of a turn, i. e., until stopped in the proper position by the action of the brake. When the upper end f the pin as has ridden onto the high spot 6 of the cam 37, the arm 54: is under the pawl 63. The machine then rotates until 'the'end of the pin 4.9 snaps into notch 7 of the cam 37. This movement sets the brake 36 almost instantly. It also moves the hub 27 out of contact with the roll carrier, and operates the tension release.

When the operator presses down the tread'le to start the machine, the following series of movements takes place. The roll 51 on the treadle bar 13 moves the tail 50 of the stop lever 40 down and swings the pin 4-9 out of the path of the cam 37. This lets the pawl 63 off the arm 54 on the collar 45.' The spring 99 is then free to release the brake and re-set the tension release. The downward movement of the roll 51 on the treadle bar 13 allowsthe latch 52 to swing into 'theposition shown in Fig. 1' with its lower end against the tail 50 on the stop lever. The roll 19 then engages the wearing surface 20 on the bell crank 21 and at'the same time, the upper endof the latch 52 hooks onto the said wearing surface 20. The further movement of the trea-dle downward, pushes the drive wheel G into frictional contactwith the hand wheel D, setting the main shaft in motion at a speed determined by the pressure exerted on the treadle. Reference is here made to my copending divisional application Serial No. 199,402,

filed October 31, 1917, wherein the novel 1. In combination with a machine includ- I ing stitching mechanism, driving mechanism therefor, a stop motion which acts on the driving mechanism to increase the speed of the machine and then to stop it, and mechanism acting on the stop motion to prevent it stopping the machine except during a predetermined part of the cycle of operation of the stitching mechanism.

2. In combination with a sewing machine having stitch forming instrumentalities and a main shaft, driving mechanism therefor, a cam revolving with the main shaft and stop mechanism which acts on the driving mechanism to increase the speedof the machine and then to stop it, said cam operating to prevent the stop motion stopping the machine except during a predetermined part of the cycle of operation of the stitch forming instrumentalities.

' 3. Tn combination with a sewing machine having stitch forming instrumentalities, a needle and a needle actuating mechanism, driving mechanism for the machine, a stop motion and mechanism acting on the needle actuating mechanism during the forward movement of the machine to cause it to ship 1 a stitch just before the stop motion stops the machine.

4. In combination with a sewing machine having stitch forming instru-mentalities including a needle, needle actuating mechanism, driving mechanism for the machine, a stop motion and mechanism acting on the needle actuating mechanism ,during the forward movement of the machine, and actuated by the stop motion to cause the machine stops the madriving mechanism for the machine's. stop motion which acts on the driving mechanism to increase the speed of the machine and then to stop; it, mechanism acting on the stop motion to revent it stopping the machine except during a predetermined part of its cycle of operation and mechanism set in motion by the stop motion and acting on laid in the barb of the needle and a stitch,

will be skipped, said means being set immotion by the stop {motion just before it stops the machine. i i 8. In combination with a sewing machine having stitch forming instrumentalities including an oscillating barbed needle, driving mechanism for the machine, a stop motion which acts on the-driving mechanism to increase the speed of the machine and then to stop it, means acting on the needle to change the osition of its axis of oscillation so that a stitch will be skipped, said means being set in motion by the stop motion just before it sto s the machine.

9. n combination with a sewing machine,

driving mechanism therefor, stitching 'instrumentalities and means for causing them to skip a stitch, a stop motion, a treadle bar, connections from the treadle bar toeach of the hereinbefore mentioned elements whereby the movement of the treadle bar actuates the said elements, a cam rotating with the driving mechanism and means actuated by the cam to release the treadle bar at a predetermined point in the cycle of the machine.

10. In combination with a sewing machine, driving mechanism therefor, stitching instrumentalities, including a needle, needle actuating mechanism, means for acting on '.the needle, actuating mechanism during the forward movement of the machine for causin thes'titching'instrumentalities to skip a pendent full speed driving mechanism therefor, stitchin instrumentalities and means for causing t em to skip a stitch, a tension release, a stop motion to stop the machine,

a. treadle bar and connections from' the treadle bar to each of the hereinbefore mentioned elements whereby the movement of the treadle bar actuates the said elements.

12. In combination with a sewing machine, variable speed driving mechanism and independent tull speed driving mechanism therefor, stitching instrumentalities and means 'for causing them to skip a stitch, a tension release, a stop motion, a treadle'bar, connections from the treadle bar to each of the hereinbefore mentioned elements whereby the movement of the treadle bar actuates the said elements, a cam rotating with the driving mechanism, and means actuated by the cam to release the treadle bar at a predetermined point in the cycle of the machine.

13. In a machine of the character described, a variable speed clutch, a stop motion, a movable treadle bar. which operates the variable speed clutchby one partof its movement and actuates the stop motion by another part of its movement, and a stop motion cut-out acting on the treadle bar to limit its range of movement to that part which actuates the variable speed clutch.

14. In amachine of the character described, a variable speed clutch, a stop motion, a movable treadle bar which operates the variable speed clutch by one part of its movement and" actuates the stop motion by another part of its movement, said treadle bar having a notch of a length equal to the range of movement which operates the variable speed clutch, and a member movable into or out of the said notch to limit the range of moi ement of the treadle bar to that necessary to operate the clutch.

15. In a sewing machine, a barbed needle, a stitching shaft, connections from the shaft foroscillating the needle, means for changing said connections to give the needle a single abnormal stroke in the final stitch cycle,

in time with the shaft for controlling said means. i

16. ha sewing machine, a barbed needle, a stitching shaft, connections from the shaft for oscillating the needle, a stopping mechanism for stopping the machine with the needle retracted, and means for changing said connections to give the needle a shortened "stroke in thefinal stitch cycle whereby it will not come to loop-receiving position, and will carry no loop in final retracted position. 17. In ,asewing machine, a barbed needle,

. a stitching shaft, connections from the shaft for oscillating'the needle, means acting when themachineiisrunning forward for changing said connections to give the needle an abnormal stroke and a timing device moving with said shaft for operating said means.

18. In a sewing machine, a barbed needle, a stitching shaft, connections from the shaft for oscillating the needle, a stopping mechanism for stopping the machine with the needle retracted, and means for changing said connections upon stopping to give the needle an abnormally short advance followed by a similarly-short retraction to restore normal conditions and leave the needle barb free of a loop.

19. In a sewing machine, a barbed needle, mechanism for giving the needle on each stitch cycle a normal advance and return stroke, means for applying a thread loop on the needle advance stroke, a stopping mechanism for stopping the machine with the needle retracted, and means for changing the needle advance stroke in the final stitch cycle to avoid taking the loop as the final stitch cycle is performed, whereby the final needle retraction will be without loop.

20. In a sewing machine, a barbed needle, mechanism for giving the needle on each stitch cycle a normal advance and return stroke, means for applying a thread loop on the needle advance stroke, a stopping mecha nism for stopping the machine with the needle retracted, and means for shortening the advance stroke of the needle to avoid taking the "loop, when performing the final stitch cycle whereby the final needle retraction .is without loop.

21. In a chain stitch sewing machine, a stitching shaft, a needle, and actuating mechanism for reciprocating the needle uniformly cycle after cycle through a normal stroke, means operative during a cycle for rendering abnormal the needle stroke and a cam moving in time with the shaft fortiming the action of, said means.

' 22'. In a sewing machine, a barbed needle, and actuating mechanism for reciprocating the needle uniformly cycle after cycle through a normal stroke, a stopping mechanism for stopping the machine with the needle retracted, and means operative during the final stitch cycle for shortening the needle stroke whereby to-miss a loop upon stopping the machine.

23. In a sewing machine, a needle mechanism acting normally to reciprocate said needle through a given path of movement,'connections acting while the machine is running forward for changing the stroke from the normal stroke to an abnormal stroke and a timing device moving withthe needle actuating mechanism for controlling said connections. c,

24. In a sewing machine, a needle'mechanism acting normally to reciprocate said needle through agiv en path of movement, stopping mechanism and connections acting while the-machine is running forward for changing the stroke from the normal stroke to an abnormal stroke as the stopping mechanism acts to stop the machine.

25. In a sewing1 machine, a needle, a drive shaft, a driven s aft, means for d'etachably connecting said shafts, actuating mechanism connecting said needle with said driven shaft, connections acting while the machine is running forward for changing the stroke of the needle from the normal stroke to an abnormal stroke upon the disk connection 26. In a sewing machine, a barbed needle, a stitching shaft, connections from the shaft for oscillating the needle, means acting when the machine is running forward for changing said connections to ive the needle an abnormal stroke, a stop evice, a controller for applying said stop device, and devices associated with said controller and movable in'timed relation to said shaft for determining the actuation of said connection changmg means. i 27. In a sewing machine, in combination, a stitching shaft, a barbed needle, connections for oscillating said needle from said shaft comprising a lever and a shiftable pivot therefor a stopping mechanism for stopping the machine wlth the needle retracted, and means associated 'with said stopping mecha nism for shifting said pivot whereby to ive the needle a shortened stroke in the nal stitch cycle.

28. In a sewing machine, a barbed needle, a stitching shaft, connections from said shaft for vibrating the needle comprising an oscillatory supporting member providing an eccentric pivot and a lever mounted'to turn freely upon said pivot, means for stopping the machine with the needle retracted; controlling means for oscillating said supporting member whereby to give the needle a sin le abnormal stroke in the final stitch cyc e, and a timing device moving in time with the shaft for determining the actuation ofsaid controlling means.

29. In a sewing machine and in combinetion, a stitch-forming instrumentality having a normal path of movement during the formation of the stitch, a moving member actuating said stitch-formin instrumentality, an eccentrically mounte pivot on which said actuating member is pivoted, and means to rotate said eccentrically mounted pivot to cause the actuatin member to vary the path of movement of tIiestitch-forming instrumentality.

30. In a sewing machine and in combination, a stitch-forming instrumentalityhavw eccentrically mounted pivot so as to change the axis of oscillation 0 said actuating member and thereby vary the path of movement of the stitch-forming instrumentality.

= 31; In a sewing machine and in combination, a stitch-forming. instrumentality having a normal path of movement during a formation of a stitch, an oscillatable member actuate. said stitch-forming instrumental-ity, means foractuatin said oscillatable member, an eccentrica lly mounted pivot on which said needle actuating memher is pivoted, means to rotatably adjust said eccentrically mounted pivot at the will of the operator so as to change the position of the axis of oscillation of said oscillatable member and thereby vary the path of movement of the stitch-forming instrumentality.

32. In a sewing machine, in combination with a needle, an oscillatable actuating memher to give reciprocating movement to the needle, driving mechanism for actuating said needle moving member an eccentrlcally mounted pivot on which said needle actuating member is pivoted and means to rotatably adjust the eccentrically mounted pivot on its axis at the will of the operator and thereby change the path of movement of the needle.

33. In a sewing machine in combination, with a needle, an oscillatable needle actuating lever, a shaft, an eccentric on said shaft on Which said lever is pivoted and which is normally in position for the lever to give a stitch-forming movement to the needle, means for oscillating the lever on said eccentric, a pinion on said shaft, a rack which actuating lever and change the path of movement of the needle.

34:. In a sewing machine and in combina tion, a stitch-forming instrumentality hav ing a normal path of movement during the formation of the stitch, an oscillatable inem- 35 her Which actuates said stitch-forming instrumentality, a pivot on which said oscillatable member is mounted and means to change the position of the axis of said pivot and to thereby cause the actuating member 40 to vary the path of movement of the stitchforming instrumentality, the axis of said pivot being stationary in its adjusted position during the oscillation of the actuating member.

In testimony whereof I affix my signature.

FELIX EMILE VALUES.

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