USRE13018E - Thread-controlled stop-motion mechanism - Google Patents

Description

- c. H. WHITCHER. ATHREAD GONTROLLED STOP MOTION MBCHANISM.

APPLICATION FILED JULY 8,1909.

e wm 0m w 1m H Reissued Aug. 31, 1909.

c. H. WHITGHBR. THREAD coNTRoLLED sToP MOTION MTCHANISM.

APPLICATION FILED JULY8,1909. l Ressued Aug. 31, 1909. T 1 3,018.

2 SHEETS-SHEET 2.

i tion 1s always positive, sure and accurate.

NITED STATES'PATEN T OFFICE.

THRE AD-CONTROLLED STOP-MOTION MECHANISM.

1 3, 0 1 S, Specification of Reissued Letters Patenti. ReiSSiled Aug'. 3 l 1 9 0 9 Original No. 918,803, dated April 20, 1909, Serial No. 858,393. Application for reissue Vfiled July 8, 1909. Serial No. 506,640.

To all whom it may concern: ism, thus enabling the stop motion mech- Be it known that LCHARLES Hi WHITCHER, aiiisin to be used in connection with higha resident of Franklin, county ofl Merrimack, `speed machines, such` seamless knitting State of New Hampshire, and formerly of g machines which require a belt shifter. To Lakeport, count-y of Belknap, State of New g operate av belt shifter for stopping the ma- Hampshire,` have invented an Improvemen chine is impractical in connection with highin Thread-Controlled Stop-Motion Mechanspeed machines because it cannot be operated ism, of which the following description, in quickly enough and when operated requires connection with the accompanying drawing, the use of brakes which jar and injure the is a specification, like characters on the drawmachine. ing representing like parts. 1 Another feature of the invention resides This invention resides in a stop motion dei in a carriage for the thread-guides of a vice or mechanism self-contained instructure stop motion mechanism whereby they can be and adapted-for use in connection with a moved into reach of the attendant when thread-using machine. It is particularly threading u the mechanism after stopping. adapted and designed for use in connection i Another iie'ature of the invention resides with a knitting machine to which thread is in the construction of the actuator sustained supplied from suitable bobbins or spools. by 'the thread Tand its coperative parts By the use of the term thread I intend whereby all danger from its non-operation to cover any form of yarn, thread or similar by becoming clogged or entangled with the material adapted for use in knitting or other thread or yarn fibers is avoided. machines. The features above enumerated and others The importantfeature of the invention will appear from the accompanying speciresides in the independent and self-contained fcation and drawings, and will be more parcharacter of the stop motion mechanism ticularly pointed out in the appended claims. whereby it may be used in connection with The drawings show the preferred form of any thread-using machine and may be an apparatus embodying the invention dechanged from one machine to another as de` signed for setting up on the Hoor adjacent sired. For example, in the case of knitting to the thread-using machine. machines, it is frequently desirable to change Figure l of the drawing in elevation repfrom one size of cam cylinder to another to'v resents a machine embodying my invention. allow of the knitting of different sizes of Fig. 1aL shows part of the apparatus of my goods. The construction of the presentrininvention broken off of Fig. 1. Fig. lb a top vention being entirely independent of the view of the plate m2. Fig. 2 is a detail at thread-using machine, any such change can the left of the section line w. Fig. 3 an enbe made without in any way affecting its larged detail of the part of the mechanism operation or requiring the removal and refor stopping the machine on occurrence of p aceinent and re-adjustment of parts of the bunches or `knots in the thread. Fig. t is a stop motion mechanism. Furthermore, by detail looking at the parts shown in Fig. 3 reason of its self-contained and independent from the right. Fig. 5 is an enlarged detail construction the present invention is adapted for use with any and all kinds of machines and may be changed from oiie kind of machine to another, and is thus adapted for use with all kinds of old machines as well as new.

Another important feature of the invention resides in the fact that the mechanism for causing the stopping of the machine is positively operated so that the stopping acmachine when the thread breaks. Fig. (3 is a section in the line o0', Fig. 5. Fig. 7 is an enlarged detail looking at` the central part of the machine from the right, Fig. Il, and Fig. 8 is a modification: Referring to the drawings, A represents partof the base or framework of a machine, embodying the invention and adapted to be supported from the floor or support for a thread-using machine, such las a knitting machine. f

As already pointed out, the machine of this invention is self-contaiiied and inde- Another important feature of the invention resides 1n the embodiment of a clutchliig mechanism 1n this stop motion mechanshowing part of the means for stopping the ndent and may be located adjacent to any l orm of thread-using machine with which it is desired to operate.

In the preferred form of mechanism illustrated the base sustains bearings for a shaft A. having a fast pulley A2 driven constantly and constituting a driving element, said shaft having splined thereon a cone A7 grooved circumferentially to be engaged by suitable pins in the forked end of a cone sliding lever A8 mounted on a stud 2 held in a depending arm A". The shaft A- is provided with a driven element herein shown as a loose clutch pulley A3 that drives a belt for actuating the knit-ting or other machine to which the threads or yarns, a, a are fed, said pulley being adapted to be connected to said shaft to drive a knitting or other machine when the clutch closing lever A6 under the control of the cone A1, is moved, as will be described. I have not shown fully the construction of the clutch pulley as any usual form of clutch pulley having a lever A6 maybe used without departing from my invention.

Rising from the base A is a rod B on which is adjustably mounted by a set screw BX a collar B having an extended arm provided with a boss B2 that receives a rod B3 constituting the fulcrum fora startin lever B4, shown as connected at its inner en at B, Fig. 2, with a projection BG attached to the upper end of a link B1, in turn adjustably connected by bolt B2, with a radius bar B9 having its fulcrum on a studr B10 carried by a depending arm B12 mounted on a rod B13 forming part of the base or frame work A, said radius bar being provided with a pin 3 as shown. Then the outer end of lever B1 is depressed, it acts throu h the connections described to depress the ar B9 so that its pin 3 meets the cone sliding lever AS and moves the cone to the right, Fig. 1, to start the machine, which done the lever B1 is released and is moved by gravity into its normal inoperative position Fig. 2. Above the collar B.the stand has connected therewith a bobbin or spool-carrier C, adapted to sustain a plurality of thread-supplying means herein shown as two bobbins C', each supplied with thread or yarn a. The rod B higher up sustains a collar C2 from which is extended an arm C3 that constitutes a bearing for a rock shaft C4 having an arm C8 united by a. flexible connection C1 with the cone sliding lever A8. The rock-shaft C4 is provided with a plurality of disks C5 each provided `with a notch C, there being as many of these disks as there are thread-su plying means and each disk being rigidly connected with the rock-shaft C4.

The rock shaft C1 has loosely mounted thereon pawl-carriers D each provided with a pawl D having a pin 4 that contacts normally With an arm D2x of a controller one of which is provided for each pawl and is herein shown as a three-armed lever mounted on a stud D3 extended from the projection C3, the lower arm D4 of said lever being weighted that it may act when free to move said controller or lever in the direction of the arrows shown thereon to allow the pawl D to drop into operative engagement with the notch C8 of its corresponding disk C5.

The shaft A has an attached cam 7 that strikes a roller stud S, see Fig. 2, of a lever 9 pivoted at 12 and united by a connection 13, shown as a chain, with the carrier D for the pawls D so that said pawl carrier is moved constantly, a spring D12 connected with said pawl-carrier acting normally to keep the roller 8 in contact with its actuating cam.

A spring 44 connected at one end to the upright B by means of a collar 46 and setscrew 45, and at the other end to the disks C, serves as a counterbalance against the weight of the arm C2, connector chain C, and other parts. The disks C5 are returned to normal position after they have been moved by the operation of the Apawls D by the movement of the shipper lever B41 which, through the intermediate arts described, will exert a downward pul on the connector chain C", and thus move the disks C5 back to the position from which they were moved by the operation of the pawls D.

Above the collar C2 the rod or upright B has mount-ed thereon by a set-screw E a hub E provided with a plurality of radially- I, extended arms E2, one corresponding with each thread and sustaining in each case a lever or main releasing device The upper end of a given controller or lever D2 is acted upon and held normally by the end of a main releasing device D5 under control of the thread or yarn a, to be further described, and mounted on a stud DG of an arm E2, the said end of said lever having a stud 5 with which is connected a link DF5 which when raised, by fault in the thread or yarn, as will be described, releases the lever D2 that it may turn to the right Fig. 7, due to the weight D4, and let the pawl D drop and engage the notch CG of disk C moving said disk, shaft, arm CS and con-v nector C9 to turn the cone sliding lever and slide the cone A7 to the left from its position Fig. 1, release the lever AG and stop further rotation of pulley A3 and the parts to be driven thereby.

As shown in Figs. 1 and 5, each arm E2 has erected upon it a thread or yarn guiding stand E3 provided as shown in Figs. 5 and 6, with pins 15 between which the yarn passes and is guided on its way to the devices of the thread-usine machine such as the usual needles of a knitting machine, said pins being shown as rising from bars 1G that sustain the thread or yarn on its way through the apparatus. Between these bars 16 the thread or 'arn is acted upon by and sustains the foot 1l of the main actuator of the stop motion mechanism to be herein claimed, said main actuator being represented as a lever 18 mounted on a stud 19, the lever having-preferably a finger or projection 20 that coacts with the short end of the releasing device D, said main actuator being normally held when the thread i`s` unbroken in a position to retain the said releasing device D5 in the full line position Figs. 5, 6 and 7. The construction of this thread-guiding device and actuator is an important feature of the device and is illustrated more fully in detail in Fig. 6. The bars 16 carryin the thread-guiding pins 15 are separated rom each other a sufficient distance so that the fibers of the thread or yarn as they are rubbed off will not become entangled with these bars and the end of the main actuator so as to prevent its operation. With the ordinary form of threadguiding devices in which the parts are slightly separated, the fibers gradually collect upon and wrap around these parts and thus fasten them together and prevent their separation when the thread or yarn breaks. The distance between the bars 16 will be governed by the length of fibers of the yarn, but in practice if spaced apart an inch and a half, they will prevent trouble from the source indicated by most any form of yarn. This construction renders necessary the foot 17 hereinbefore referred to which, as illustrated, consists of a flat piece pivoted at the end of the main actuator 1S and extending nearly the entire distance between the bars 16. One end of the foot, herein shown as the upper end, is arranged to bear upon one bar 16 and is provided with a thread-guiding notch shown in Fig. 5 which prevents the thread from being pinched between the bar and the foot, while the other end swings clear of the opposite bar. It will thus be seen that as the thread travels over the bars 16 and under the foot, the foot is supported thereupon and prevented from falling by any immaterial strain and until the thread breaks or is released when the foot will turn on its pivot being rocked against the bar 16 and allow the actuator 18 to fall.

Above the hub E the rod B sustains a tube G that serves as a guide for a vertically movable carriage G having oppositely extended arms G one for each thread supply and each having a stud 21 on which is pivoted a crank arm G2 provided with threadguiding arm 42, said crank arm having a pin 22 that engages the lower end of a link 23 jointed at 24 to an auxiliary actuator shown as a lever G"l pivoted at 25 on the arm G. The arm G has a stop 26 against which the short arm 27 of said auxiliary actuator is normally maintained by a lever 28 free to turn on a stud screw 29, each lever 28 having a connected spring 30, the free ends of said levers 28 receiving in holes thereon the links Ds before described, the lower ends of the springs 30 being att-ached to studs 32 of a collar 33 secured to the tube G. The links D8 above the holes in the free ends of the lever 28 have fastened to them a collar mshown in Fig. 1a, said figure showing part of the thread-sustaining mechanism broken off the top of Fig. 1, and also showing the carriage in its depressed position for allowing the re-threading of the thread-guide.

The upper end of each link DS is secured to a fork or plate fm? secured to a collar m3 secured to the upper end of the tube G, said fork or plate having connected therewith the upper end of a spring m4 contained in said tube and connected at its lower end with a plug m5 having extended therefrom a stud m through a slot m7 in said tube, said stud entering a hole in the carriage GX. The spring m4 act-s normally to lift the carriage Grx and retain its upper end seated yieldingly against the underside of said collar. The carriage as shown has a screw eye n4, with which is attached a chain of such length as to be easily grasped by the hand of the shortest person to attend the machine.

Vvvhenever a thread breaks and the inachine is stopped automatically, the thread has, it Will be understood, to be again introduced under the foot 17 and laid on the arm G2, and this is difficult to do if the attendant of the knitting machine is short of stature. To enable the threads to be reapplied the operator may engage the chain, pull down the carriage GX and with it the parts G', G2, G3, which parts are fully shown in Fig. 1, but omitted from Fig. 1a to simplify the drawing. The upper end of each stiff or wire link D8 is headed at 40, as shown in Fig. 1a, after having been inserted through a slot l2x in the plate m2.

In operation the threads a. delivered from the bobbins C', C', pass under the feet 17 of the main actuator of the stop motion device, and said device is held in its abnormal inoperative position, as shown in the drawings, the thread passing under said foot between the pins or guides 15. The threads then pass upwardl and are laid on the crank arm Gr2 at one side of the guide wire 42 extended therefrom. Now in case the thread breaks, the foot 17 of the main actuator being no longer supported bythe thread, the lever 18 will turn to the rightfrom its position Fig. 7 and acting upon the short arm of the main releasing device Dn will turn said device about its pivot D6 causing the long arm of said lever to rise and free the pawl-controller D2 that the pawl D may engage and turn disk C5 and move the cone to the left Fig. 1 and stop the pulley A3.

It will be noted that when the controller or lever D2 is released by the thread through the intermediate agencies described and the pawl allowed to drop into engagement with the disk, that the operation of the clutch is then caused positively and accurately. No springs or other inaccurate devices intervene in this mechanism. The pawl D is positively driven from the driving shaft A of the apparatus and acts in turn to operate positively the clutch A".

It will be understood while the machine is running properly, that the stud 4 of the pawl D will ride upwardly on the inclined part of the controller D2 and slide back and forth on the horizontal part thereof without the end of the pawl meeting the notch in the disk C5. The spring 4:4 serves as a sort of a check to prevent the disk C5 following backwardly at the same speed as the pawl D as the latter is moved'backwardly or to the left Fig. 7 In case a knot or bunch occurs in the threads which would injure the needles, the machine must be'stopped, and to do this the bunch will contact with and be arrested by the pins 15, and the strain so put on the thread or yarn will exert sufficient strain on the crank arm G2 to turn said arm about its pivot 21, causing the link 23 acting on the auxiliary actuator G3 to cause its short arm to be raised to lift the'free end of the lever 28 and connection Ds before described, which movement will immediately move the main releasing device, releasing the controller D2 as before described, and stopping the pulley A.

The crank arm G2 with the pin 42 forms a large-sized thread-guide of such size that the thread in running during the operation Yof the machine will not jump or spring out owing to kinks or inequalities, and at the same time the movement of the parts under the strain or tension caused by a knot or bunch catching in the pins 15 is such that the thread easily passes out from the threadguide over the curved end of the arm G.

The construction of the parts of this mechanism is such as to be very sensitive to the tension on the thread. The inclination of the crank-arm G2 and its connection with the auxiliary lactuator lever G3 by means of the link 23, presents a construction 'where the pull on the thread in passing through the thread-guide acts upon any slight increase to rock the auxiliary actuator lever. The degree of tension required to rock the parts is regulated with great exactness by means of the stop 26 which can be set at any desired height, and by the strength of the spring 30, which should be sulicient to hold the auxiliary actuator lever Gs against the stop in opposition to the weight of the crank-arm G2 and connected parts, together with the desired tension on the thread at which the parts shall move. This construction does away with any dead pull over the .thread-guide and permits the use of soft spun yarns, and in a knitting machine prevents tightening of the loops on the needles and consequent injury to the fabric. It will thus be seen that the stop motion mechanism will be operated by or through the occurrence of a fault in the thread such as the breaking of the thread or the occurrence of a knot or bunch in the thread. In each instance the clutch pulley is released through the positive connections from the lever D5 to the clutch.

Wvhen the stop motion mechanism has been operated to unclutch the driven element A3, the thread-using machine which is driven by this element will, of course, be stopped at once. When the thread hasbeen replaced the mechanism is started by clutching the driven element through the operation of the hand lever B4. It will be noted that this lever for operating the clutch is a part of the independent self-contained mechanism constituting this invention. The threadusing machine itself may be provided as usual with a starting and stopping lever or shipper for starting and stopping the machine independently of the breaking or failure of the thread. The mechanism of the present invention is concerned only with the stopping of the machine upon the breaking or failure of the. thread and the starting of the machine after the repair or replacement of the thread.

In the construction illustrated as a preferred embodiment of the invention it will be noted that all the various mechanisms above the base are supported fromv collars adjustably mounted on the upright or rod B. This enables the entire device to be altered to suit the particular conditions, such as variations in the length of bobbins or cones of thread, the height of the particular machine with which it is to be used, the speed at which the machine with which it is to be used is run, and other conditions which may occur.

Having described my invention, what I claim as new and desire to secure by Letters Patent is 1. A self-contained stop motion mechanism for use in connection with a threadusing machine, comprising a base, a driving element and a driven element mounted on said base, the said driven element being adapted to drive said thread-using machine, clutching means for connecting and disconnecting said driving and driven elements, and means rendered operative by or through the occurrence of a fault in the thread to cause the disconnecting of said clutching means.

2. A self-contained stop motion mechanism for use in connection with a threadusing machine, comprising a base, a driving element and a. driven element mounted on said base, the said driven elelnent being adapted to drive said thread-using machine,

clutching means for connecting and disconnecting said driving and driven elements, means rendered operative by or through the occurrence of a fault in the thread to cause the disconnecting of said clutching means, and manuall -operated means to cause the connectin o sa1d clutching means.

3. A se :t-contained stop motion mechanism for use in connection with a threadusing machine, comprising a base, a driving element and a driven element mounted on said base, the said driven element being adapted to drive said thread-using machine, clutching means for connecting and disconnecting said driving and driven elements, and means positively actuated by said driving element and rendered operative by or throu h the occurrence of a fault in the thread to cause the disconnecting of said clutching means.

4. A self-contained stop motion mechanism for use in connection with a thread-using machine, comprising a base, a driving element and a driven element mounted on said base, the said driven element being adapted to drive said thread-using machine, clutching means for connectin and disconnecting said driving and driven e ements, means positively actuated by said driving element and rendered operative by or through the occurrence of a fault in the thread to cause the disconnecting of said clutching means, and manually-operated means to cause the connecting of said clutching means.

5. A Self-contained stop motion mechanism for use in connection with a threadusing machine, comprising a base, a driving element and a driven element mounted on said base, the said driven element being adapted to drive said thread-using machine,

y clutching means for connecting and disconnecting said driving and driven elements, a lurality of thread supplies mounted on said ase, a plurality of means one for each thread supply and each rendered operative by or through the occurrence of a fault in its thread to cause the disconnecting of said clutching means.

6. A self-contained stop-motion mechanism for use in connection with a threadusing machine, comprising a base, a driving element and a driven element mounted on said base, the said driven element being adapted to drive said thread-using machine, clutching means for connecting and disconnecting said driving and driven elements, a

lurallty of thread supplies mounted on said ase, a plurality of means one for each thread supply and each positively actuated by said drivmg element and each rendered operative by or through the occurrence of a fault in its thread to cause the disconnecting of said clutching means.

7. A self-contained stop motion mechanism for use in connection with a threadusing machine, comprising a base, a driving element and a driven element mounted on said base, the said driven element being adapted to drive said thread-using machine, clutching means for connecting and disconnecting said driving and driven elements, positively actuated means for causing the disconnecting of said clutching means, a lurality of thread supplies mounted on said ase, and a plurality of thread-guiding devices mounted on said base, one for each thread, and acting by or through the breaking of the thread to render operative said positively-actuated means.

8. A self-contained stop motion mechanism for use in connection with a threadusing machine, comprising a base, a driving element and a driven element mounted on said base, the said driven element "being adapted to drive said thread-using machine, clutching means for connecting and disconnecting said driving -anol driven elements, positively-actuated means for causing the disconnecting of said clutching means, a plurality of thread supplies mounted on said base, a plurality of thread-guiding devices mounted on said base, one for each thread, and acting by or through the breaking of the thread to render operative said positivelyactuated means, and a plurality of auxiliary thread-guiding devices mounted on said base and actin upon the occurrence of a knot or bunch 1n the thread to render operative said positively-actuated means.

9. A thread-controlled stop motion mechanism comprising means for stopping the operation of a driven element, a threadguiding stand provided with two threadguiding supports widely separated to prevent the thread fibers extending therebetween, an

actuator arm provided with a wide thread supported foot pivoted at the end thereof and adapted to rest on one of said supports and to swing clear of the other, and means rendered operative by the movement of said Y actuator arm upon its release by the failure of the thread to actuate said stopping means.

l0. A thread controlled stop mot-ion mechanism comprising means for stopping the operation of a driven element, a threadguiding stand provided with two threadguiding supports widely separated to prevent the thread fibers extending the-rebetween, an actuator arm provided with a wide thread supported foot pivoted at the end thereof and adapted to rest on one of said supports and to swing clear of the other, the edge of the foot resting upon the support being provided with a thread-guiding notch, and means rendered operative by the movement of said actuator arm upon its release by the failure of the thread to actuate said stopping means.

11. `A thread controlled stop motion mechanism, comprising two thread-guiding thread fibers extending therebetween and supports widely separated to prevent the an actuator arm provided with a Wide thread supported foot'pvoted at the end thereof and adapted to rest on one of said supports and to swing clear of the other whereby upon the failure of the thread the actuator arm is released.

12. A thread controlled stop motion mechanism, comprising two thread-guiding supports Widely separated to prevent the thread fibers extending therebetween and an actuator arm provided with a Wide thread supported foot pivoted at the end thereof and adapted to rest on one of said supports and to swing clear of the other, the edge of the foot resting upon the support being provided With a thread-guiding notch.

13. A thread-controlled stop motion mechanism, comprisin a base, an upright from said base, a carriage mounted to slide upon said upright, a plurality of arms extending from said carriage, a thread guide pivotally mounted on each arm and provided with a wide open mouth, a lever pivoted on each arm and connected with each thread guide and adapted to be rocked by said thread guide upon the occurrence of an abnormal tension on the thread, means rendered operative by the movement of said lever to actuate the stopping mechanism.

14. A thread controlled stop motion mechanism, comprising a base, an upright from said base, a carriage mounted to slide upon said upright, a spring for holding said carriage in its normal raised position, a plurality of arms extending from said carriage, a thread-guide pivot-ally mounted on each arm and provided with a Wide o en mouth, a lever pivoted on each arm an connected with each thread guide and adapted to be rocked by said guide upon the occurrence of an abnormal tension on the thread, means rendered operative by the movement of said lever to actuate the stopping mechanism.

15. A thread-controlled stop motion mechanism, comprising a base, an upright therefrom, a carriage vertically movable on said upright, a plurality of arms extending from said carriage, movable thread-guides mounted on said arms and adapted to render operative the stopping mechanism upon the occurrence of abnormal tension on the thread, a spring for maintaining said carriage in its raised position, and means whereby the carriage may be lowered by the operative within reach for threading.

16. A thread-controlled stop motion mechanism, comprising an upright, a plurality of arms projecting from said upright and downwardly-curved at their ends along which the freed thread slides and is guided, pivoted thread-guides mounted on and near the outer ends of said arms and provided with large wide open mouths for guiding the thread, means rendered operative by the movement of said thread-guides upon the' occurrence ofabnormal tension on the thread to actuatesaid stop mechanism and deliver the `thread on the downwardly-curved end of its said arm.

17. A thread-controlled stop motion mechanism, comprising a support, an auxiliary actuator lever pivoted on and near the outer end of said support, a crank arm pivoted thereon and provided at its free end with a thread-guide, a link connecting one end of said lever and said crank-arm, and means for yieldingly holding said parts in, and acting' to return said parts to, normal position with the crank-arm inclined to the direction of the pullupon the thread passing through said thread-guide.

18. A thread-controlled stop motion mechanism, comprising a support, an auxiliary actuator lever ivoted thereon, a crank arm pivoted on and) near the outer end of said support and provided at its free end with a thread-guide, a. link connecting one end of said lever and said crank-arm, and means for yieldingly holding said parts in and acting to return said parts to normal position with the crank-arm inclined to the direction of the pull upon the thread passing through said thread-guide. n

19. A thread-controlled stop motion mechanism, comprising a support, an auxiliary actuator lever pivoted thereon, a crank arm pivoted thereon and provided at its free end With a thread-guide, a link connecting one end of said lever and said crank arm, a stop on said support, a spring connected with the opposite end of said lever and acting normally to hold the lever against the stop with the crank arm inclined to the direction of the pull upon the thread passing through said thread-guide. y v

20. A self-contained stop motion mechanism for use in connection with a thread-using machine, comprising a base, a shaft mounted in said base, a driving element for said shaft mounted thereon, a driven element mounted on said shaft, said driven element being adapted to drive said thread-using machine, a clutch for connecting and disconnect-ing said driven element and said shaft, a cam mounted on said shaft, a pivotally-mounted pawl, positive connections between said cam and pawl whereby the latter is positively and continuously operated, a pivoted notched disk adapted to be engaged by said pawl and connected with said clutch to cause the operation thereof, said pagwl being normally held out of engagement with said disk, and means rendered operative by or through the occurrence of a fault in the thread to cause the operation of said disk by said pawl and thus actuate the clutch.

21. A self-contained stop motion mechanism for use in connection with a thread-using machine, comprising a base, a driving elemeans, and means whereby the distance bement and a driven element mounted on said tween said thread supply and said threadbase, the said driven element being adapted guiding device may be adjusted.

to drive said thread-using machine, clutch- In testimony whereof, I have signed my 15 5 ing means for connecting and disconnecting name to this specication, in the presence sald drivilrllg md driven elenents, mean1 for of ltwo subscribing Witnesses.

causing t e isconnecting o said c utc in means, a thread supply mounted on sai CHAS H' WHITCHER' base, a thread-guiding device mounted on Witnesses: 10 said base and acting by or through the break- JOHN C. EDWARDS,

ing of the thread to render operative said THOMAS J DRUMMOND.

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