US660130A - Thread-cutter for sewing-machines. - Google Patents

Description

No. 660,80. Patented Oct. 23, I900.

B. W. THOMSON.

THREAD CUTTER FOR SEWING MACHINES.

("0 Made. (Application filed June 25, 1900.)

5 Sheets-Sheet I.

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Patented octfzs, I900.

No. 660,I30.

R. W. THOMSON.

THREAD CUTTER FOR SEWING MACHINES.

I (Application filed June 25, 1900. (No Model.) s Sheets-.Shoet 2.

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N0. 660,|30. Patented Oct. 23,1900.

' B. W. THOMSON.

THREAD CUTTER FOR SEWING MACHINES.

(Application filed June 26, 1900.) (No Model.) 5 Sheets-Sheet 3.

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Patentd Oct. 23, I900.

R. W. THOMSON;

THREAD CUTTER FDR SEWING MACHINES.

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No. 660,130. Patented Oct. 23,1900. R. W. THOMSON. THREAD CUTTER FOR SEWING MACHINES. (Application filed June 25, 1900. (No Model.) 5 Sheets -Sheet 5.

FTIEI THE NORRIS PETERS co.. PWTO-LIYNO, wasume'ron. o. c.

UNIT D STATES I {PATENT ()FFICE.

ROBERT W. THOMSON, or LYNN, AssAcnusn'rrs, AssIcNoRTo THE MORLEY BUTTON SEWING MACHINE COMPANY, OF SAOO, MAINE,

AND BOSTON, MASSACHUSETTS.

THREAD-CUTTER FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 660,130. dated October 23, 1966. Application filed June 26, 190:0. Serial No. 21,427. \llo model.)

To ttZZ whom it may concern:

Be it known that I, ROBERT W. THOMSON, a citizen of the United States, residing at Lynn, in the county of Essex and State of Massachusetts, have invented a new and useful Improvement in Sewing-Machines, of which the following is a specification.

My invention relates to sewing-machines wherein the thread is automatically cut when the stitching operations cease; and it consists of improvements whereby the automatic thread-cutting operation is so determined at the will of the person operating the machine that threads may be cut as the machine stops,

no matter what the desired length of scam may be.

My improved machine is so constructed that the operator may determine nearly within the limits of a single revolution of the needleshaft the precise point at which the seam is to terminate and the threads are to be cut.

In the drawings hereto annexed, which illustrate an embodiment of my invention, Figure l is a longitudinal elevation of asewing-machine with my improvement attached. Fig. 2 is a plan view of the same machine with portions of the bed-plate and neck of the machine broken away to show the working parts. Fig. 3 is an end elevation viewed from the left-hand side in Fig. 1. Fig. l is a detail of the stitch-forming and thread-cutting mechanism, illustrating the operation of the cutter. Fig. 5 is a plan view of that portion of Fig. 4 which lies below the throat-plate of the machine. Fig. 6 is a detail showing a locking mechanism which operates in conjunction wilh the cutting mechanism. Fig. 7 is a view on an enlarged scale and in part section of a portion of the machine as shown in Fig. 3. Fig. Sis a detail, also on an enlarged scale, of part of the cutter-actuating mechanism; and Fig. 9 is a plan .view, on an enlarged scale and partly in section, of that portion of the machine shown in the lower left-hand corner of Fig. 2.

The machine shown in the drawings, to which my improved stopping and cutting mechanisms are attached, is an ordinary double-thread sewing-machine of the oscillatinghook type, wherein 1 is the bed plate, and 2 the neck.

N is the needle-shaft, P is the throat-plate, and E, Figs. 4 and 5, is the vibrating-hook mechanism which controls the lower thread. The needle-shaft N is driven by a belt which passes over the pulley p, the pulley p adjacent thereto,-being a loose pulley for the reception of the belt when the machine is not running.

S is the power-shipper, in this case comprising a fork s, which guides and controls the belt. The power-shipper is at all times under the control of the person operating the machine and is connected by a neck 5 to a pivoted shipper-block s pivoted at 5 A spring 3 (shown in Fig. 9,) compressed between the pivoted shipper-block s and the machine-frame, constantly urges the shipperblock and its attached power-shipper into a position of power disengagement, which in this case corresponds to the position of the shipper-fork s, which holds the belt on the loose pulley 10 The shipper is held in position of power engagement at the will of the operator, who compresses the spring 3 by means of a treadle or some equivalent device which, through a rod or strap a, intermediate connection a bell-crank a a pivoted at a, enables him to exert a suflicient pressure upon the pivoted shipper-block s to overcome the stress of the spring 8 When, therefore, the operator desires to stop the machine, he releases the treadle and the aforesaid intermediate mechanism and permits the spring 8 to assert itself, when the powershipper forks will move the belt from the fastpulley p to the loose pulleyp its movements being otherwise ordered and controlled by mechanism presently to be described. The stoppage of the machine at a predetermined point is effected by the operation of the shipper-block s in'oonjunction with a cam and wiper fast to or integral with the needle-shaft N. The upper end of the shipper-block s is bored out to receive a yielding toe 8 which when the shipper is held in position of power engagement stands close to the lower side of the needle-shaft N and ad jacent to the path of rotation of the cam it and wiper it. When the pressure against the power-shipper actuating-spring s is removed by the person operating the machine, the shipperblock and toe 5, carried therby, immediately tend to move in response to the effort of the spring 3-; but the proper tions of the toe s and cam 11. are such that only when the lowest part 71 of the cam n passes opposite the end of the too .9 can the latter move in response to the effort of the spring 3*. (See Fig. 7.) When the lowest part n of the cam it in the rotation of the needle-shat t N, as indicated by an arrovi in- Fig. 7, comes opposite the end of the shipperblock toe the latter instantly moves under the face of the cam it this movement being to the left as the machine is viewed in Fig. 1. Further rotation of the needle-shaft Ni brings the rising surface it of the cam 01 to bear against the too 3 which is thereby crowded downwardly against the spring .9 until the notch n in the cam 17. reaches the end of the too .9 which thereupon snaps into the notch n". The movement of the toe s into position under the face of the cam 91, was accompanied by a corresponding movement 1 of the shipper-fork s to the left, as viewed in Fig. 1, so that thereafter only the mo mentum of the machine serves to carry the parts to the full-stop position. The last resi- 1 due of momentum of the machine is absorbed by the collision of the wiper n with the toe s The shipper-block s is mounted in a forked bearing .9 which holds the pivotscrew This fork s is itself pivoted at s to the frame of the machine, so that it is susceptible of oscillation in a plane at right angles with the plane of movement of the shipper-block s in response to the spring 8 Therefore the impact between the wiper n. and toe s is cushioned by the yielding of the pivoted fork 8 as indicated in dotted lines in Fig. 7. This movement is against the stress of a spring which returns the shipper-block s to its normal position, as shown in solid lines in Fig. 7, where it rests against the stop 8 The spring which returns the shipper-block to normal position will presently be described in connection with other mechanism with which it is associated.

As the above-described stop-motion is relied on to arrest the moving parts of the ma chine and in a large measure to absorb the momentum, it is desirable so to determine the operation of the stop-motion that proper allowance may be made for the slowing down of the moving parts. For this purpose I provide a shipper-detent H, (most plainly shown in Fig. 9,) pivoted at h provided with a tooth or hook I1 and an oppositely-extended arm h. The ship per-detent His constantly urged toward a position of engagement of the shipper-block by a spring h. By this arrangement the shipper-block s is held against the attempted operation of its spring 3*- whenever the operator moves the shipper into position (not shown) and the connections a, a a a and a, Fig. 1. Thus if the operator at any time wishes to stop the machine he releases the action of the shipper-spring-compressing mechanism, and so far as he is concerned the shipper may move; but the precise instant at which the shipper shall be released is determined by the timing of the 'shipper-detent II and the trippcr T, which at the proper stage in the rotation of the needleshaft releases the shipper-detent from its engagement with the shipper or its connections. This trippcr T consists of the following devices: The tripper-dog i, Figs. 1, 7, and 9, is secured to the end of a rigid arm 25 by a set-screw 1 which provides suitable means for adjustment. The arm i is secured to and projects from a boss 2%, which in turn is secured to or forms a part of a vibrator pivoted to the machine-frame at '0 and having a cam-follower c, which follows the path-cam n cutin the cam-block n, which is carried by the needle-shaft N. By this means the tripper vibrates once for each reciprocation of the needle-shaft, and the tripperdog i, being so adjusted as to wipe or strike against the arm h of the shippecdeten t, moves the hook it of the shipper-detent I-I out of engagement with the shipper-block. The proportions and adjustments of the several parts above named should be such that the shipper-detent is tripped and the shipper-block released just before the lowest part a of the cam a Fig. 7, comes opposite the end of the shipper-block toe 5 Then if the operator has released the pressure by which the stress of the spring 8 is overcome the blade will be shipped from the tight to the loose pulley and the needle-shaft have nearly a full rotation in which to lose its momemtum.

The above-described stop motion and its movements are intimately associated with the operation of cutting the thread at the end of a seam. The thread-cutter of the cutting devices 0 (see Figs. 2, 4, and 5) is pivotally mounted at 0 adjacent to and just below the throat-plate P of the machine. The cutter is provided with cutting edges c and a th readengaging horn c, which with the movement of the cutter moves in advance of the cutting edges. A link 0 is joined to the cutter at c and to a cutter-lever at c. This cutterlever is pivoted at c on the lower side of the machine-frame and near the edge thereof, and a spring 0 holds the cutter-lever and cutter and other connecting parts normally in the position shown in Fig. 2, where the cutter is fully retracted and out of operation. The arrangement of a thread-engaging horn c in advance of the cutting-edges provides for the drawing off of sufficient thread at the end of the seam to insure the proper starting of the next seam. The proper time to engage the threads with the horn c is when the upper needle is rising above the throat-plate, this being the time when ordinarily the thread is being drawn upward and the loop tightened. The time for stopping the machine is when the upper needle is at its highest position, this being the time when the goods may be moved upon or from the work plate. Therefore as in this machine the thread-cutting movement is simultaneous with the stoppage of the machine the initial movement of the cutter is made to take place as the needle rises and the machine is stopped, this initial movement being sufficient to engage the loops of thread with the horn c, which holds them extended, so that the cutting edges 0 can with advantage operate upon' them and so that the slack is not drawn into the goods, but is drawn 01f in preparation for the next start of the machine. The movement of the cutter is therefore divided into an initial stage and a final stage. Both parts of this movement, however, are associated with movement of the power-shipper from position of power engagement to one of power disengagement. The initial movement of the cutter, which suffices to engage the loops of thread with the looper c, is effected by the following train of mechanism:

The vibrator V, pivoted to the machineframe at o and heretofore alluded to as the carrier and actuator of. the tipper T, has a cam-follower 1 attached to its upper arm 12 The lower part c of the vibrator V is forked and carries hinged thereto a vibrator-toe t whose tongue o forms part of the hinged connection. (See Fig. 1.) The vibrator-toe o carries adj ust-ably secured upon it a cam or wedge block 12 The latter devices are best seen in Fig. 9. A rocking leverLis provided with a contact-piece P, which consists of a screw passing through the lever end Z. This lever has an upper arm Z and a lower arm 1 and is pivoted at Z. The lower end Z of the lever-arm Z is connected with the inner end 0 of the cutte r-lever c by means of the short link o (See Fig. 8.) When the machine is in operation, the cam n on the needle-shaft N causes the vibrator V to vibrate synchronously with the reciprocations of the needlebar, and by this means the vibrator-toe 12 with its wedge-block or cam 0 constantly vibrates between the contact-piece Z and the frame of the machine. The vibrator-toe and the parts carried thereby are so porportioned that while the machine is in operation (the belt being constantly held upon the tight pulley p) the wedge-block 12 passes clear of the contact-piece Z without touching or disturbing the same.

Operative contact between the vibrator V and the lever L is secured by means of the shifter W, Figs. 1 and 9, which is constructed and operates as follows: Secured to the machine-frame directly behind the vibrator-toe o is a plate to, which is provided with an inclined surface and aslot 10. (See Fig. 9.) Between the plate to and vibrator-toe o there lies the thin fiat bar 10 (See Figs. 1, 3, 7, and 9.) The bar 10 is curved and secured to the shipper-block s at 10 its securement being sufficiently loose to give a little play. A pin 10*, which enters the slot 10 holds the bar 20 suspended in proper position. Upon the free end of the bar 20 there is fixed a blockw which is close to and adapted to engage with the inclined surface 10 of the plate 1.0 It will be seen upon reference to Fig. 9, which shows the parts of the machine in position after the shipper is moved to a position of power disengagement, that the proportions of the plate to, the block 20 and the vibrahorn c behind and into the loops of the threads, and, furthermore, this movement is so timed by the proportion of the parts and the time of their operation that an entrance of the horn a into the thread-loops takes place just as the needle is rising out of the goods. This situation is illustrated in Figs. at and 5, where the needle-bar n and needle n are ascending from the goods. The horn c has engaged the loops of thread and prevents the rising of the needle-bar from drawing the loops into the work, and thus enough slack thread'is retained clear of the Work and the needle-eye to insure the proper initiation of the next stitch to be taken. It is obvious that the throw of the cutter during this initial movement under the influence of the vibrator V should be limited and that the cut.- ting edges 0 should not at this moment come in contact with the thread. For this purpose I have provided the stop 0 which consists of a pin projecting from the plate 0, which is pivoted at o to the machine-frame and is held in position by the spring 0 which brings the plate up against the pin 0". (See Figs. 1, 7, and 8.) The stop-pin o is so placed that the initial movement of the lever L brings the inner side of the lower arm Z to bear against the end of the stop-pin 0 This stoppin 0 being on a movable plate 0, is after- IIO ward and for purposes to be described removed from a position of engagement with the arm Z of the lever L. The primary cause of active engagement between the wedgeblock or cam 21 upon the vibrator-toe n with the contact-piece Z of the lever L is the movement of the bar 10 of the shifter V, with its wedge-block w in contact with the plate w. (See Fig. 9 In turn the cause of this movement of the bar 10 is the movement of the shipper-block s from the position of power engagement to the position of power disengagement by the train of mechanism causing the movement of the shipper-block, which has been described above. Thus by the means described the act of the operator in releasing the shipper-spring 5" causes the power to be disengaged from the machine and at the same time the initial movement to be given to the cutter G, which inserts the horn 0' into the loops of the thread. A further and final movement of the cutter is necessary in order to sever the threads and to completely prepare the machine for the beginning of another seam.

The spring-stop against which the shipperblock 5 comes to rest when impelled by the impact of the wiper n against the toe s is the spring 9 (Seen in Fig. 7.) The spring 9 is coiled about a pin g and lies in a socket bored in a bracket G, secured to the machineframe. A screvwplu g g serves to con fine the spring 9 in the socket-bearin g in the bracket G and also constitutes a sliding bearing for the pin g. The spring g at one end bears against the screw-plug g and at the other end against the collar which is fast upon the pin g. The end of the pin g is so placed that the lateral oscillation of the shipperblock .9 due to the impact of the Wiper n pushes the pin g against the stress of the spring g. The other end of the pin g in its operation slides out of the screw-plug g Upon the bracket B (see Fig. 1) and in bearings b b therefor there is mounted a rockshaft m which serves as a pivot-shaft for the lever M. Through the upper end m of the lever M passes the contact-screw m which at its inner end is in juxtaposition to,

the end of the pin above referred to. The lower arm on of the lever M is provided with a catch m which in certain positions of the lever M engages with the detent K. (See Figs. 6 and 7.) The rock-shaft m which serves conveniently as a pivot for the lever L, has secured to its right hand end, as viewed in Fig. 1, the arm m which extends downward parallel with the lower arm Z of the lever L. A pin m projects laterally from the end of the arm m and lies across the face of the lower arm Z of the lever L. The position of these parts is such that when the upper end m of the lever M is moved outward or to the right, as viewed in Fig. 7, the pin on will move inward against the arm 1 and give the lever L a movement in addition to that which has been imparted to it by the wedge-blockw upon the vibrator V; but in order to effect this the stop 0 must first be moved from its opposition to the lever-arm Z. In order to provide for this, I secure to the lower end of the arm m a slotted plate m by means of the screw 771 (See Fig. 8.) The movable plate 0, which' carries the stop-pin 0 carries also at its right-hand end (see Figs. 1 and 8) the beveled pin 0 The beveled pin 0 lies directly opposite the inner corner of the plate M secured, as above described, to the lever-arm m WVhen, therefore, the lever-arm m begins its inward movement, its first act is to strike against the beveled surface of the pin 0 and thereby to lift the pin, turning the plate 0" upon its pivot 0 and removing the stop-pin o from its opposition to further movement of the lever-arm Z Thus the instrument by which the final movement of the lever-arm Z is accomplished also provides means for such final movement by removing the obstacles which stand in the way of the lever-arm l Returning now to Fig. 7 and the descrip tion of the stop-motion, it will be recalled that the shipper-block .9 by means of its yielding toe s served to absorb the momentum of the machine,and in so doing rocked upon the pivot s and moved the pin g against the stress of the spring g which when the machine finally came to rest returned the needle-shaft N to the position shown in solid lines in Fig. 7. This movement of the shipper-block and pin 9 is transmitted to the lever M through the medium of the contact-screw m Whose head m is thrust into the position shown in dotted lines in Fig. 7. The final movement thus communicated to the lever L by the lever M takes place at the instant the machine is brought to a full stop and the needle-bar is raised to its highest point, and this final movement serves to give the cutter O the remainder of its stroke by which the cutting edges come in contact with the threads and sever them. The cutter is held in the extreme position last assumed by means of the catch and detent shown in Fig. 6, where m is a sectional view of the lower arm of the lever M. (See Fig. 7.) The catch m when the lever M is moved to the position shown in dotted lines in Fig. 7, hooks over the detent is at 7.2 The detent 7c is pivoted at k and controlled by the spring When the machine is again started by the operator depressing the rod or strap ct and the parts connected therewith, the bellcrank a a" is depressed at the same time with the bell-crank a" a and the lower arm a of this bell-crank lever bears against the arm 7x of the detent K (see Fig. 6) and releases the catch in and lever M. Then the spring 0", (see Fig. 2,) attached to the cutter-lever, asserts itself, and all the connecting parts are restored to their position of readiness to act when the machine is again stopped.

Brieflysummed up, the operation of the machine is as follows: Assuming that the machine has started to sew, the operator holds the shipper by pressing against the shipperspring s" by means of the tria llerod c1 and its connections. The machine now approaches the end of the seam which the operator desires to have completed, and at the proper moment the operator releases the pressure on the shipper-block and permits the shipper-spring to assume control. Mean while by each revolution of the needle-shaft N and attached cam 92 the vibrator V has been vibrated synchronously with the reciprocation of the needlebar, and the tripper T has been similarly vi brating and actuating the shipper-detent H at each vibration. Now that the operator'has permitted the shipper-spring to assume control all that retains the shipper S in position of power engagement is the hooked end .77. of the shipper-detent H, and the next time the tripper T rises and the tripper-toe t strikes the arm h of the shipper-detent the shipperspring .9" moves the shipper-toe 8 against the side of the cam 91 and out of posit-ion of engagement with the shipper-detent. Then when the rotation of the needle-shaft brings the lowest part a of the cam 11 opposite the shipper-toe the shipper is released, and the shipper-spring throws the shipper and shipperblock into position of power disengagement. This movement of the shipper-block releases the machine from the control of the drivingbelt and at the same time, through the movement of the connecting-bar m of the shifter W, moves the hinged toe o of the vibrator V into position for collision with the contactpicce Z of the initial-movement lever L, and the next vibration of the vibrator V by means of the lever L and the cutter connections gives the cutter 0 its initial movement by which the threads are engaged by the horn c. The parts of the machine are so proportioned and timed each with relation to the others movements that the initial movement of the cutter takes place as the needle is rising to its highest position. The toe s" of the shipper-block is now in contact with the cam p and the machineshaft N andv its connected parts, by reason of their momentum, carry the wiper n around into forcible contact with the face of the toe s. Thereupon the shipper-block 8 yields laterally, pressing the pin g against the spring g and rocking the final-movement 1ever M,which, by virtue of the devices m and 0 Fig. 8, removes the stop from its opposition to the initial movement lever L, and gives the cutter through the cutter connections its final moveinent,whereby the threads are severed. This last operation absorbs what is left of the momentum of the machine, which comes to rest at a predetermined point, the needle being suspended out of the goods and the threads being drawn out and cut, so that when the machine is again placed in operative condition by the operator the stitching will begin without loss of time due to necessity for rethreading the needle. By means of the device above described or of a machine equipped with equivalent mechanism the operator has the stop-motion of the machine cons! antly under his control and can determine with great nicety the exact length of the seam which he desires to sew, and when he desires to stop the machine the stop-motion-cutter, and their connecting parts, together with the cutter-actuating devices, determine the prompt and accurate operation of the cutting device and insure the stoppage of the machine in the proper position, so that the machine is ready to resume operation the instant that the operator desires.

What I claim, and desire to secure by Letters Patent, is

l. The combination, in a sewing-machine, of a knife for cutting the threads, mechanism for operating said knife by a two-stage movement, said mechanism including a vibrator synchronized with the reoiprocations of the needle-bar, a power-shipper constantly controllable by the operator, and devices intervening between the power-shipper and the vibrator whereby when the power-shipper moves to a position of power disengagement, the first stage of movement is imparted to the knife by the vibrator, and a stop whereby the knife is prevented from exceeding its predetermined initial movement.

2. The combination, in a sewing-machine, of a knife for cutting the threads, mechanism for imparting to the knife an initial movement, said initial-movement mechanism comprising a vibrator synchronized with the reciprocations of the needle-bar, a power-shipper constantly controllable by the operator, and devices intervening between the powershipper and the vibrator whereby when the power-shipper moves to a position of power disengagement the initial stage of movement is imparted to the knife by the vibrator, mechanism for imparting the final stage of movement to the knife, said final-movement mechanism comprising cutter connections, a cam connected with the needleshaft, and a movable block carried by the power-shipper, which when the power-shipper assumes a position of power disengagement with the cam, is moved thereby, and transmits the final movement to the knife through the cutter connections.

3. The combination, in a sewing-machine, of a knife for cutting the threads, mechanism for imparting to the knife an initial movement, said initial-movement mechanism comprising a vibrator synchronized with the reciprocations of the needle-bar, a power-shipper constantly controllable by the operator, and devices intervening between the powershipper and the vibrator whereby when the power-shipper moves to a position of power disengagement the initial stage of movement is imparted to the knife by the vibrator-,and a stop whereby the knife is prevented from exceeding its predetermined initial movement, mechanism for imparting the final stage of movement to the knife, said final-movement mechanism comprising cutter connec- -ter connections, and connections between the said movable arm and the stop whereby the initial movement is controlled whereby the stop is removed from opposition in advance of the final movement of the knife.

at. In a sewingmachine, the combination of a needle-shaft, power connections thereto, a stop-motion therefor comprising a power-shipper, devices at all times controllable by the operator, whereby the power-shipper is movable into or out of position of power engagement, a thread-cutter, movably mounted adjacent to the throat-plate of the machine, cutter-operating connections provided with a contact-piece located in juxtaposition to a vibrator, the vibrator movably mounted and provided with connections to the machineshaft whereby the vibrator is given a vibratory movement synchronous with the reciprocations of the needlebar, a cutter-actuating toe, carried by the vibrator, and normally vibrating clear of the cutter-connection contact-piece, a shifter, movable with relation to the path of the vibrator, into conjunction with the vibrator-toe whereby the vibrator is brought into coactive relationship with the cutter-connection contact-piece, connections between the shifter and the powershipper whereby, when the power-shipper is moved to a position of power disengagement the shifter is moved into conjunction with the vibrator-toe, and vice versa, when the power-shipper is moved to a position of power engagement, substantially as described and for the purposes set forth.

5. In a sewing-machine, the combination of a needle-shaft, power connections thereto, a stop-motion therefor comprising a po Wer-shipper, devices at all times controllable by the operator, whereby the power-shipper is movable into or out of position of power engagement, a thread-cutter, movably mounted adjacent to the throat-plate of the machine, cutter-operating connections provided with a contact-piece located in juxtaposition to the vibrator, the vibrator movably mounted and provided with connections to the machineshaft whereby the vibrator is given a vibratory-movement synchronous with the reciprocations of the needle-bar, a cutter-actuating toe, carried by the vibrator, and normally vibrating clear of the cutter-connection contact-piece, a shifter, movable with relation to the path of the vibrator, into conjunction with the vibrator-toe whereby the vibrator is brought into coactive relationship with the center-connection contact-piece, connections between the shifter and the power-shipper whereby, when the powenshipper is moved to a position of power disengagement the shifter is moved into conjunction with the vibrator-toe, and vice versa when the powershipper is moved to a position of power engagement, a shipper-detent, movable into and out of engagement with the shipper and adapted to coact therewith when the shipper is in position of power engagement, a shipperdetent tripper movably mounted and connected with the machine-shaft in such manner as to move synchronously with the vibrations of the vibrator into coactive relationship with the detent to move the same out of engagement with the shipper, substantially as described and for the purposes set forth.

6. In a sewingmachine, the combination of a needle-shaft, power connections thereto, a stop-motion therefor comprising a power-shipper,-devices at all times controllable by the operator, whereby the power-shipper is movable into or out of position of power engagement, a thread-cutter, movably mounted adjacent to the throatplate of the machine and provided with a thread-engaging horn in advance of the cutting edges, cutter-operating connections provided with a contact-piece located in juxtaposition to a vibrator, the vibrator movably mounted and provided with connections to the machine-shaft whereby the vibrator is given a movement synchronous with the reciprocations of the needle-bar, a cutter-actuating toe carried by the vibrator and normally vibrating clear of the cutter-connection contact-piece, a shifter, movable with relation to the path of the vibrator into conjunction with the vibrator-toe, whereby the vibrator is brought into coactive relationship with the cutter-connection contact-piece, connections between the shifter and the powershipper whereby, when the power-shipper is moved to a position of power disengagement the shifter is moved into conjunction with the vibrator-toe and vice versa, when the powershipper is moved to a position of power engagement, the vibrator-toe, shipper and contact-piece being so proportioned that movement of the cutter connections in response to the vibrator advances the thread-hook into engagement with the thread; a wiper carried by the needle-shaft, a shipper-block movable into the path of the wiper as the power-shipper is moved to position of power disengagement, the said shipper-block being also movable in the direction of movement of the wiper, a supplemental cutter-actuator operatively joined to the cutter connections, provided with a contact member, connections between the latter and the shipper whereby, when the shipper-block moves into the path of the Wiper the cutter connections are further operated to move the cutting edges of the cutter across the thread and sever the same, substantially as described.

7. In a sewing-machine, the combination of a needle-shaft, power connections thereto, a stop-motion therefor comprising a power-shipper, devices at all times controllable by the operator, whereby the power-shipper is movable into or out of position of power engagement, a thread-cutter, movably mounted adjacent to the throat-plate of the machine and provided with a threadengaging horn in advance of the cutting edges, cutter-operating connect-ions provided with a contact-piece located in juxtaposition to avvibrator, the vibrator movably mounted and provided with connections to the machine-shaft whereby the vibrator is given a movement synchronous with the reciprocations of the needle-bar, a cutter-actuating toe carried by the vibrator and normally vibrating clear of the cutterconnection contact-piece, a shifter, movable with relation to the path of the vibrator into conjunction with the vibrator-toe, whereby the vibrator is brought into coactive relationship with the cutter-connection contact-piece, connections between the shifter and the power-shipper whereby,when the power-shipper is moved to a position of power disengagement the shifter is moved into conjunction with the vibrator-toe and vice versa, when the power-shipper is moved to a position of power engagement, the vibrator-toe, shipper and contactpiece being so proportioned that movement of the cutter connections in response to the vibrator advances the threadhook into engagement with the thread; ashipper-detent, movable into and out of engagement with the shipper and adapted to coact therewith when the shipper is in position of power engagement, a shippendetent tripper, movably mounted and connected with the machine-shaft in such manner as to move synchronously with the vibrations of the vibrator into coactive relationship with the detent to move the same out of, engagement with the shipper; a wiper carried by the needle-shaft, a shipper-block movable into the path of the wiper as the power-shipper is moved to position of power disengagement the said shipper-block being also movable in the direction of movement of the wiper, a supplemental cutter actuator operatively joined to the cutter connections, provided with a contact member, connections between the latter and the shipper whereby, when the shipper-block is moved into the path of the wiper the cutter connections are further operated to move the cutting edges of the cutter across the thread and sever the same, substantially as described.

8. In a sewing-machine, the combination of the needle-shaft, power-shipper, power-actuating devices at all times controllable by the operator, the thread-cutter, mounted adjacent to the throat-plate, cutter connections, the contact-piece therefor, the vibrator, movable and synchronized with the needle-bar, the vibrator-toe, the shifter and connections therewith to the shipper, substantially as described.

9. In asewing-machine, the combination of the needle-shaft, power-shipper, power-actuating devices at all times controllable by the operator, the thread-cutter, mounted ad jacent to the throat-plate, cutter connections,

the contact-piece therefor, the vibrator, movable and synchronized with the needlebar, the vibrator-toe, the shifter and connections therewith to the shipper, the shipper-detent and its tripper, movable and synchronized with the vibrator, substantially as described.

10. In a sewing-machine, the combination of the needle-shaft, power-shipper, shipperactnating devices at all times controllable by the operator, the thread-cutter mounted adjacent to the throat-plate, its thread-horn in advance of the cutting edges, cutter connections, the contact-piece therefor, the vibrator, movable and synchronized with the needlebar, the vibrator-toe, the shifter, connections therewith to the shipper, the wiper carried by the needle-shaft, the shipper-block movable into the path of the wiper and also movable in the direction of the movement of the wiper, the supplemental cutter-actuator, operatively joined to the cutter connections, connections between the supplemental cutteractuator and the movable shipper-block, substantially as described, and for the purposes set forth.

11. In a sewing-machine, the combination of the needle-shaft, power-shipper, shipperactuating devices at all times controllable by the operator, the thread-cutter mounted adjacent to the throat-plate, its thread-horn in advance of the cutting edges, 'cutter connections, the contact-piece therefor, the vibrator, movable and synchronized with the needlebar, the vibrator-toe, the shipper-detent, its tripper, movable and synchronized with the vibrator, the wiper carried by the needleshaft, the shipper-block movable into the path of the wiper and also movable in the direction of the movement of the wiper, the supplemental cutter-actuator, operatively joined to the cutter connections, connections between .the supplemental cutter-actuator, and the movable shipper-block, substantially as described, and for the purposes set forth.

12. In a'sewing-machine, the combination of the needle-shaft, power-shipper, shipperspring, devices at all times controllable by the operator whereby the shipper is movable against the stress of the shipper-spring, the thread-cutter, pivotally mounted adjacent to the throat-plate,cutterconnections, a con tactpiece therefor, the vibrator, pivoted and provided with connections to the machine-shaft wherebyit is vibrated synchronously with the needle-bar, the vibrator-toe hinged to the vibrator, the shifter, consisting of a wedge, and con nect ions therewith to the shipper,substantially as described and for the purposes set forth.

13. In a sewing-machine, the combination of the needle-shaft, power-shipper, shipperspring, devices at all times controllable by the operator whereby the shipper is movable against the stress of the shipper-spring, the thread-cutter, pivotally mounted adjacent to the t-hroat-plate,cutter connections, a contactpiece therefor, the vibrator, pivoted and provided with connections to the machine-shaft whereby it is vibrated synchronously with the needle-bar, the vibrator-toe hinged to the vibrator, the shifter, consisting of a wedge and connections therewith to the shipper, the shipperdetent,its tripper, carried by the vibrator, substantially as described and for the purposes set forth.

14. In a sewing-machine, the combination of the needle-shaft, power-shipper, shipperspring, devices at all times controllable by the operator whereby the shipper is movable against the stress of the shipper-spring, the thread-cutter pivotally mounted adjacent to the throat-plate, its thread-horn in advance of the cutting edges, cutter connect-ions, a contact-piece therefor, the vibrator, pivoted and provided with connections to the machineshaft whereby it is vibrated synchronously with the needle-bar, the vibrator-toe, hingred to the vibrator, the shifter, consisting of a wedge, connections therewith to the shipper; the wiper carried by the needle-shaft, the shipper-block pivoted on two axes, movable on one axis into the path of movement of the wiper and in the other in the path of movement of the wiper, the supplemental cutteractuator operativelyjoined to the cutter connection, connections between the cutter-actuator and the movable shipper-block, substantially as described and for the purposes set forth.

15. In a sewing-machine, the combination of the needle-shaft, power-shipper, shipperspring, devices at all times controllable by the operator whereby the shipper is movable against the stress of the shipper-spring, the thread-cutter pivotally mounted adjacent to the throat-plate, its thread-horn in advance of the cutting edges, cutter connections, a contact-piece therefor, the vibrator, pivoted and provided with connections to the machine-shaft whereby it is vibrated synchronously with the needle-bar, the vibrator-toe, hinged to the vibrator, the shifter, consisting -of a wedge, connections therewith to the shipper; the shipper-detent, its tripper, carried by the vibrator, the wiper carried by the needle-shaft, the shipper-block pivoted on two axes, movable on one axis into the path of movement of the wiper, andin the other in the path of movement of the wiper, the supplemental cutter-actuator operatively joined to the cutter connection,connections between the cutter-actuator and the movable shipperblock, substantially as described and for the purposes set forth.

16. In a sewing-machine, the combination of the needle-shaft, stop-motion, shipper, shipper-actuating devices at all times controllable by the operator, the thread-cutter movably mounted adjacent to the throat-plate, cutter connections, the contact-piece therefor, the vibrator, movable and synchronized with the needle-bar, the vibrator-toe movably mounted on the vibrator and playing between a stationary base and the cutter-connection contact member, the shifter, movable into and out of the space between the vibrator-toe and the stationary base, connections between the shifter and the shipper, whereby the shifter is moved, substantially as described and for the purposes set forth.

17. In a sewing-machine, the combination of the needle-shaft, stop-motion,shipper,shipper-actuating devices at all timescontrollable by the operator, the thread-cutter movably mounted adjacent to the throat-plate, cutter connections, the contact-piece therefor, the vibrator, movable and synchronized with the needle-bar, the vibrator-toe movably mounted on the vibrator and playing between a stationary base and the cutter-connection contact member, the shifter, movable into and out of the space between the vibrator-toe and the stationary base, connections between the shifter and the shipper, whereby the shifter is moved, the shippendetent, and its tripper, movable and synchronized with the vibrator, substantially as described and for the purposes set forth.

18. In a sewing-machine, the combination of the needle-shaft, stop-motion,shipper,shipper-spring, devices at all times controllable by the operator whereby the shipper is movable against the stress of the "shipper-spring, the thread-cutter pivotally mounted adjacent to the throat-plate, cutter connections, a contact-piece therefor, the vibrator, pivoted and provided with connections to the machineshaft whereby it is vibrated synchronously with the needle-bar, the vibrator-toe, hinged to the vibrator and moving in a path between the cutter-connection contact-piece and the machine-frame, the shifter consisting of a Wedge movable into the space between the vibrator-toe and the machine-frame, and connections between the shifter and the shipper, substantially as described and for the purposes set forth.

19. In a sewing-machine, the combination of the need le-shaft, stop-motion,shipper,shipper-spring, devices at all times controllable by the operator whereby the shipper is movable against the stress of the ship per-spring, the thread-cutter pivotally mounted adjacent to the throat-plate, cutter connections, a contact-piece therefor, the vibrator, pivoted and provided with connections to the machineshaft whereby it is vibrated synchronously with the needle-bar, the vibrator-toe, hinged to the vibrator and movingin a path between the cutter-connection contact-piece and the machine-frame, the shifter consisting of a wedge movable into the space between the vibrator-toe and the machine-frame, connections between the shifter and the shipper, the shipper-detent movably mounted, and a tripper therefor carried by the vibrator, substantially as described and for the purposes set forth.

20. In a sewing-machine, the combination of the needle-shaft, power-shipper, shipperactuating devices at all times controllable by the operator, the thread-cutter mounted adj acent to the throat-plate, cutter connections, the contact-piece therefor, the vibrator, movable and synchronized with the needle-bar, the vibrator-toe, a contact-shoe mounted adj ustably thereon, the shifter and connections therewith to the shipper, substantially as described.

21. In a sewing-machine, the combination of the needle-shaft, power-shipper, shipperactuating devices at all times controllable by the operator, the thread-cutter mounted adjacent to the throat-plate, cutter connections, the contact-piece therefor, the vibrator, movable and synchronized with the needle-bar, the vibrator-toe, a contact-shoe mounted adjustably thereon, the shifter and connections therewith to the shipper, the shipperdetent and its tripper, movable and synchronized with the vibrator, substantially as described.

22. In a sewing-machine, the combination of the needle-shaft, power-shipper, shipperactuating devices at all times controllable by the operator, the thread-cutter mounted adjacent to the throat-plate, its thread-horn in advance of the cutting edges, cutter connections, the contact-piece therefor,the vibrator, movable and synchronized with the needlebar, the vibrator-toe, acontact-shoe mounted adj ustably thereon, the shifter, connections therewith to the shipper, the wiper carried by the needle-shaft, the shipper-block movable into the path of the wiper and also movable in the direction of the movement of the wiper, the supplemental cutter-actuatorfoperatively joined to the cutter connections, connections between the supplemental cutter-actuator and the movable shipper-block, substantially as described and for the purposes set forth.

23. In a sewing-machine, the combination of the needle-shaft, power-shipper, shipper actuating devices at all times controllable by the operator, the thread-cutter mounted adspring, devices at all times controllable by the operator whereby the shipper is movable against the stress of the shipper-spring, the thread-cutter pivotally mounted adjacent to the throat-plate, cutter connections, a contact-piece therefor, the vibrator, pivoted and provided with connections to the machine shaft whereby it is vibrated synchronously with the needle-bar, the vibrator-toe hinged to the vibrator, a contact-shoe mounted adjustably thereon, the shifter, consisting of a wedge, and connections therewith to the shipper, substantially as described and for the purposes set forth.

25. In a sewing-machine, the combination of the needle-shaft, power-shipper, shipperspring, devices at all times controllable by the operator whereby the shipper is movable against the stress of the shipper-spring, the thread-cutter pivotally mounted adjacent to the throat-plate, cutter connections, a contact-piece therefor, the vibrator, pivoted and provided with connections to the machineshaft whereby it is vibrated synchronously with the needle-bar, the vibrator-toe hinged to the vibrator, a contact-shoe mounted adjustably thereon, the shifter, consisting of a wedge, connections therewith to the shipper, the shipper-detent, its tripper, carried by the vibrator, substantially as described and for the purposes set forth.

26. In a sewing-machine, the combination of the needle-shaft, power-shipper, cutter, cutter connections, shipper-detent, tripper, vibrator, vibrator-shifter, initial-movement lever, final-movement lever, and means, constantly controllable by the operator whereby the movement of the power-shipper, through the aforesaid devices actuates the initialmovement lever and final-movement lever in succession, substantially as described.

Signed by me at Boston,Massachusetts,this

20th day of June, 1900.

ROBERT WV. THOMSON. Witnesses:

JOHN (3. SPRING, E. F. (Leon.

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