US1291661A - Machine for operating upon leather. - Google Patents

Description

MACHINE FOR OPERATING UPON LEATHER.

APPLICATION FILED JUNE 29, 1914.

1,291,661. Patented Jan. 14,1919.

I I SHEET$SHEET I.

messea jug enivrv L.E.TOPHAM. MACHINE FOR OPERATING UPON LEATHER.

' APPLICATION FIL ED1UNE 29. 19M. 1,291,661

Patented Jan. 14, 1919.

I I $HEETS-SHEE12- I m messea Nmmls mm; lat my; ,msmmox D C L. E. TOPHAM.

MACHINE FOR OPERATING UPON LEATHER.

APPLICATION FILED maze. 1914.

1,291,661. Patented Jan. I4, 1919.

l I SHEETS-SHEEI 3.

L. E. TOPHAM.

v MACHINE FOR OPERATING UPON LEATHER.

APPLICATION FILED JUNE 29, I914. 1,291,661. Patented Jan-14, 1919.;

n SHEE'TS-SHEET 4.

mbl fiwe .10 gr/2 1 WM.

L. E. TOPHAM. MACHINE FOR OPERATING UPON LEATHER.

APPLICATION FILED JUNE 29,1914.

Patented J an. 14, 1919.

ll SHEETS--SHEE'I 5.

leases Nonluznlu: INLLIIHLMLLII 1510a p c L. E. TOPHAM.

MACHINE FOR OPERATING U PON LEATHER.

. APPLICATION FILED JUNE 29, I914. 1,291,661 Patented Jan. 14, 1919.

u SHEETS-SHED a.

.IZveIzb/r MILL W L. E. TUPHAM.v

MACHINE FOR OPERATING UPON LEATHER.

APPLICATION FILED JUNE 29. 1914.

I I SHEETS--$HEEI 7.

Patented Jan. 14, 1919.

L. E. TOPHAM.

MACHINE FOB OPERATING UPON LEATHER.

Patented Jan. 14,1919.

1! SHEETS-SHEET}!- fitucnlon:

' 4 g V M APFUCATION FILED IUNE29, I914- 1,291,661

Wilt/2586's.

Q MW L. E. T0 PHAM. MACHINE FOR OPERATING UPON LEATHER.

APPLICATION FlLED JUNE 29.1914. 1,291,661. Patented Jan. 14,1919

' 1| snzers-snm a.

L. E. TOPHAM. MACHINE FOR OPERATING UPON LEATHER.

APPLICATION FILED JUNE 29. I914.

Patented Jan. 14, 1919.

ll SHEETS-SHEET I0- I Patented Jan. 14,1919,

II SHEETSSHEET ll.

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APPLICATION FILED JUNE 29,1914. I

UNITED STA s PATENT FFICE.

LAURENCE E.- TQPH AM, OF SWAMPSCOTT, MASSACHUSETTS ASSIGNOR, BY MESNE "ASSIGNMEIIVTSLTO UNITED SHOE MACHI-NERY CORPORATION, OF PATERSON,

NEW CORPORATION OF NEW JERSEY.

nmcnmn non OPERATING UPON LEATHER.

' To all whom it may concern parts in any one Be it known. that I, LAURENCE E. Tor HAM, a citizen-of the United States, residing at Swampscott, in the county of Essex and- State of Massachusetts, have invented certain new and usefulImpro'vements in Machines for Operating Upon Leather; and I do hereby declare the following to be a full,

clear, and'exact description of the invention, such.-as -will enable ,others skilled in a desirable to stop'the machine with the needle and awlout of the work, and the presser foot inwork engaging. position. Thls con dition of the. parts enables the operator.

either to form one or more stitches by turninglthe machine byghar'id, the work being held from displacement by the presser foot, or to lift the presser foot-and remove the Work from the machine? It is also often desirable to stop the-machinewith the awl v in the work, and with the presser foot lifted from the work, so that the work may be turned about theawl as a fulcrum, as when the machine arrives at a poi t at whicli a sharp angle is to be formed' 11 the line of the' 'seam. To permit the removal of the Workfrom the machine the needleand awl should both be out of the work, and the presser foot lifted from the work, and it is therefore desirable that the operator should be able to stop .the machine with the parts in this condition. Sewing machines of this class heretofore'have been provided with mechanism for stopping the machine at one predetermined point in a cycle of operations and for lifting the presser foot as the machine is stopped to permit the work to be removed. In stopping such a machine at that point in a cycle without lifting the presser foot or in stopping the machine at I any other point, the operator has to slow Specification of Letters Patent. I Patented J an, 14,, 1919 Application filed une 29, 1914. Serial No. 8 17,9 40.

down and stop the machine by braking the hand wheel manually and then to turnthe machine by hand to bring theparts to the desired positions. The stopping and turnmg of the machine by hand is very tiresome to the operator, particularly when it has to be done repeatedly-as is the case in factory work and results in unnecessary loss of time.

One object of the present invention is to provide machines for operating upon leather with mechanism by which the machine may be stopped with the parts thereof in any one of a number of predetermined conditions in a certain. and reliable manner without any particular effort on the part of the operator, and which may be easily and conveniently controlled.

Another object of the invention isto provide leather sewing machines with mechanism for stopping the machine and for producing automatically any one of' the above conditions of the thread handling and work holding parts when the machine is stopped. z 'th these objects in View, a feature of the invention contemplates the provision of means for setting the stopping. and other mechanism of the machine either while the machine is running or while it is at 'rest so that when thrown into operation thereafter they will act to produce any desired one of the predetermined conditions when the machine is'stop ped by the stopping mechanism,

Another object of the invention is to provide leather sewing machines with an improved presser foot lifting mechanism for lifting the resser foot upon stopping the machine at a point in a cycle of operations when the presser foot is normally'in work engaging position. With this lastand other objects in view, the invention comprises ViLIlOllS novel and improved constructlons,

arrangements and combinations of parts hereinafter described and particularly point-j edout in the claims, the advantages of which will be obvious to those skilled in the art.

In the sewing machine 'embodyin the various features of the invention in t eir preferred forms, the machine is provided with stopping devices by which the machine may be stopped at a point in its cycle of opera-.

tions when the needle and aWl are both out of the work and the presser foot in "work engaging position, or at a point in a cycle when the and is in thework and the presser foot is lifted, in each case with the parts in What may he termed a normal condition, or in the positions which they assume at these respective points in each cycle of stitch forming operations. provided with mechanism for lifting the Presser-foot upon stopping the machine at the point in a cycle "of operations when the needle and aWl are both out of the work and the presser foot. is normally in work engaging position. This mechanisn'i is so controlled that it may be rendered active or inactive when the machine is stopped at this point in a cycle. When the machine stopped with the needle and awl out of the Work and the presser foot lifted, what may be termed an abnormal condition the parts is produced, 'nce t no parts are not in the relative positions. which they assume during each cycle of operations. The iuecli anism for stopping the machine and for liftthe pre or foot is arranged to be thrown operanon automatically upon discon-- necting the main shaft of the machine it out the main driving mecln-ini'si'u. The setting mechanism, which is provided for setting the stop 1g devices and the presser foot. lifting mechanism. to cause said devices and mechanism to produce the desired condition of the parts upon stopping the machine, is arranged to be adjusted either while the machine is running or while it is at rest. After the setting mechanism is adjusted, the machine will be stopped with the parts in the desir d condition upon the disconnec tion of the main shaftfron the driving mechanism in the usual manner. The machine is stopped and the desired condition of the parts is produced automatically without any further attention on the part of the operator, after the setting mechanism has been adjusted upon the disconnection of the machine from the driving mechanism.

While the invention has been illustrated as embodying devices for stopping the ma chine at either of two particular points in a cycle of operations of the machine. with the parts of the machine in any one of three particular conditions, it is to be'understood that the invention in its broader aspects is not limited to stopping the machine at thesc points or with the parts in these particular positions, but that it is applicable to stoppin the machine at other points and to pro ucing other desired conditions of the parts upon stopping the machine. It is also to be understood that certain features of' the invention are not limited to Wax thread sewing machines, but may be embodied with advantage in other machines for operating upon leather.

The accompanying drawings lllustrate a.

vThe machine is alsov .aeer

no thread evving niachii'ie einbodyir serious featn es of the invention int heir preferred forms, and the features of th in- TCiitlOil will be readily understood from an inspection of the drawings andthe following detailed description.

lirthe drawings F igure. 1 is a view in front elevation of the machine; Fig. 2 is' a riew in side cle ationo'f the machine looking from the right; Fig."3 is view in front elevation of the head of the machine; is a view in side elevation of the head of the machine looking from theleft; high is a view partly in side elevation and partly in vertical section of the hadofthe machine; Fig: .6 is a View partly inside elevalion and partly in vertical section illustrating particularly the parts of the machine below the work support; Fig. 7 is a view in horizom n taken substantially on the line 7 el; Fig. 8 is a detail plan view ill ing certain. parts of the presser foot me l'ianisni; Fig. 9 1s a detail view in elevation illustrating particularly the oppi. and presser foot lifting mocha: nisins; Fig. 1U 1s a View partly in plan and nartl" in horizontal section illustratin aara partly of the presser foot lifting mechanism; Fig.

13 is a View in vertical section taken substantially on the line 5-5 of Fig. '10; Fig.

14: is a detail sectional view illustrating certain parts of the slow speed clutch and lirakc mechanism and taken substantially on the line y-g of Fi llii; Fig. 15 is a detail view in front elevation illustrating certain part--= ol the controlling mechanism for the stopping and presser foot lifting mechai'iisms; and Fig. 16 is a diagrammatic view showing a development of the cam groove which forms part of the stopping mechanism.

The invention has been illustrated as cm bodied in a sewing machine. the sewing mechanism of which has th same general construction, arrangement and mode of opration s that of the machine illustrated and described in applicants pending application. Serial No. 621,286, filed April 15,

1911. In order to enable the invention to be better understood, however, certain portions of this mechanism will be briefly described in this application. For a full and complete description of the parts of the sewing mechanism of the machine not fully de scribed herein, reference may be had to the said application.

In the drawings; the awl is indicated at Q. the needle at 1-. the loop taker at G, the looper stopping and presser foot lift- .38 loop of thread in its barb and retracting por a.

- I la receiving tt'lOOP of-thread in its hook, re-

at tire thread finger; ldljthe work 1QP,'the presser foot tit-12, the'takeup at 14 and the tension at 16.

' During each cycle of operations of the machine illustrated, starting at a point'when eneedle and aw are both out of the work,

'. andjust before the awl. pierces the work, the

' fi1Wl ,l Whiie' the needle lfimainsiin retracted position; advances through the work and then moves laterally over into line w1th the tracts from the. work and remains in re- -tracted position during the remainder of the cycle of operations, while the loop of thread -is thrown. about-the shuttle by the rotary '-tracted from the work during 'substantiall .220 degrees ofa, revolution of the main sha t hook and is drsgtn down into the work by the action of the take-up. The awl, after retracting from the work, moves back to its initial position in the line of feed and remains in this position until the beginning of the next cycle of operations. The awl is reof the machine'and the shaft rotates through substantially 180 degrees while the needle is advancing through the work receiving the from the work, therernaining 180 degrees of she awl carrier. Theawl carrier is mounted its rear endv and provided with radially eX- the revolution being main shaft 38 of the machine.

needle is in retracts position.

-The awl-.2 is secured to the lower end of the awl bar '18 which is mourptled t reciprocate verticallyin suitable gu es in the car rier 20. The work is fed. by' the lateral movement or the awl while the awl is in'the Workimparted by the lateral movement of for lateral swinging movement .upon paraltel swinging arms 22 and 24. The arms 24:

' project from a 'rock-shaft26- and the lateralmovements of the awl carrier are-imparted thereto by the turning o'r rocking movements of this rock shaft. actuating the rockshaft comprises a sleeve 28 rigidly clamped to the rock shaft 26 near tending arms 30. A cam actuated swinging.

bar 32 (see Fig. is'pivotally connected at its lowerend' with the ends of the arms and. carries at its upper end a cam roll 34:.

Whiohengages in a cam groove cut in the rear face of the cam wheel 36 fixedto the lghe swinging bar 32 is hung by means of a link 42 .flfrorn'a fined pivot which is carried by the outer end of the arm l4 fixed to a shaft- 46 mounted to turn in suitable hearings in the. machine frame. A second arm 48 1s secured to this shaft and has a spring actu- .whic is arranged toengage ated lunger 50 mounted upon its outer end consumed while the I The. mechanism for the teeth of a 1 in which they may be adjusted. The link {l2 and the arm l4: are of substantially the same length and-the parts are-arranged so that the pivotal connection of the link l2 alincment with the axis of the shaft l6 when "the awl carrier is in the position which it assumes at the end of the feeding movement of the awl. With this construction the the armd8 so as to change the position of the fixed'pivot 40 and the awl always'moves to the same, limit at the end of its work feeding movement. I

The mechanism for reciprocating the awl vertically comprises a link 5a pivoted at one end to the awl bar 18 and at the other to the extremity of a swinging arm 56 fixed to the outer end of a .rock shaft 58. A second arm 60 (see Fig. 5) is secured to the rear end of this rock shaft and is -pivotally connected at its end with the forward end of a reciprocating link 62, the rear end of which is journaled upon a crank pin 64: carried upon the with the swinging bar 32 is brought into length of feed may be adjusted by adjusting front face of the cam wheel 36. The crank continuously rotating crank. The crank operated mechanism for actuating the needle, comprises a bell crank lever 68-70 pivoted at 72, the arm (58 of which is connected by the linkH with a collar 74: on the needlebar. The arm 70 of the bell crank lever 68'7() is connected by means of a link 7 (i with the arm 78 of a second bell crank lever ZS--80 pivoted at 82. The arm 80 of the {fell crank lever 7880 is pivotally con-.

nected with the forward end of a link 84, the rear end of which is journalcd upon a crank pin 86 carried at the outer end of a crank arm 88 formed upon the hub of a gear wheel 90, fixed to the forward end of the horizon tal counter shaft 92. By the rotation of the crank pin 88, the bell crankTS-SO and the bell crank 68-7.0 are oscillated so as to impart'suitable reciprocating movements to the needle bar.

The resser foot in the machine illustrated is held yicldingly with a comparatively heavy spring pressurc in engagement with the work during the greater part of each cycle of operations so as to hold the work firmly between the work support and the presser foot during the formation of the stitch buti raised from the workbefore the work is ed soas to permit the work to be fedforward without resistance gubetween the presser foot'and the worksupport. After the work has been fed, the

presser foot is again engaged yieldingly .bar 98 which is mounted to slide vertically in suitable guides 100 and 102 in the frame of the machine. The presser bar is prevented from turning in its sliding bearings by means of an arm. 104 extending radially therefrom near its upper end, the outer end of which arm is grooved or bifurcated to engage slidably a pin 106 clamped in-the upper guide bracket 100. The mechanism for raising the presser foot automatically during each cycle of operations comprises a collar or sleeve 108 slidingly mounted upon thepresser bar and provided with a perforated lug or extension 110 which slides upon a pin 112 fixed in the guide bracket 102. A compression spring 114 coiled about the pin 112 between the head of the pin-and the extension 110 acts to hold the sleeve 108 normally down in contact with the upper the arm is disengaged from the presser bar but that when the arm is ralsed from the position which it is shown in the drawings, the inner end of the arm will be brought into engagement with the presser bar to lock the presser bar to the sleeve 108.

When the outer end oft/die arm 118 is raised, the arm is first turned freely with relation to the sleeve 108 until the c am shaped inner end of the arm is turned into grippingem gagement with the presser barlockingit in the sleeve 108, after which the presser bar 98 and the sleeve 108 are lifted together during the continuation of the upward movement of the arm 118.- Thearm 118 is 05- cillated by means of a link 120 connecting said arm with an arm 122'fixed to the outer end of a rock shaft 124. The rock shaft 1 the forward end of a second continuously rotating counter shaft 134.

manner To allow the resserfeot to beyy'ieldingly engaged with t e work after i en lifted andthe work hasfbeen'fed, end of, the arm 118 is depressed to, disenr gage the cam shaped inner end of the an from the presser bar. The presser footis then depressed into engagement with th work by its actuating spring ac'omniodatin itself to any variation which nay have 00-,

curred to the work and-the sleeve 1084 moved downwardly by the spring 114 intp.

engagement with the upper end of the guide bracket 102. The point at which the dicepresser bar is gripped by the sleeve 108 and the arm 118 will Vary with theywoa'kjengaging position of the presser ifoot as ,tle:

termined by the thickness of the work so' I that thepresser foot is lifted by the presser foot lifting mechanism substantially a uni- ,form distance'from the Work regardless of the thickness of the work.

To permit the work to be removed at the l completion of the sewing operation or to be adjusted between the presser foot and the work support, it is often necessary or desirable to lift the presser foot ata time when it is normally engaged .with the work.

To enable the presser footto be raised at a time when it is normally down in work en gagingposition, the upper end of the pres 'ser bar is offset rearwardly so as (to. form an v u Wardlyextending plate 136 (see Fig. 8) which is provided with a horizontal forwardly extending ridge or shoulder 138. Within the groove formed between this ridge and the flat upper surface of the main portion of the presser bar engages the rearwardly extending. round end 140 of a lifting arm 142 formedon a sleeve 144 journaled on a pih 146 which forms a bearing for one end of a rock shaft 148. The sleeve 144 is provided with recesses 150 in which engage forwardly projectinglugs 152 on the rock shaft 148; The recesses 150 are considerably widerthan the lugs 152 so as to allow for lost motion between the sleeve 144 and the shaft 148 whenthe presser foot is attached to the rear end of the rock shaft and provided with an operating handle 156, by means of which the shaft 148 maybe turned to lift the presser foot man'u This bell crank is connected with and actw ated by the mechanism for lifting thepresthe a of a comparatively'heavy helical spring 158 i 174 and the mounted upon the bar 172. The right hand passes on its coiled aboutthe rock shaft 148 the forward end of which spring is extended laterally and bears down uponthe lifting arm' ll2, and the rear end of which is engaged by it. projection or shoulder on the forward end of a sleeve 160 mounted to rotate upon the shaft 148. This sleeve is formed of independent front and rear sections which are securedagainst relative rotation by means of the tooth connection 162. Gear teeth 164 are cut in the rear section of the sleeve and are engaged by a rotatable worm 166 having a hand wheel 168 securedthereto by which the worm is turned-to adjust the sleeve 160 on the shaft 148 and thereby adjustithe tension of the spring 158. I

The tension device comprises a tension. wheel indicated at 170 over which the thread way from the wax pot to the sewing point. This tension wheel is rota-tably mounted upon a rod or bar 172 arranged to slide longitudinally in a bracket 17 i proj ecting upwardly from the frame of the ma chine, and 'a friction device is provided to retard the rotation of the tension wheel so as to place the thread under tension. The tension wheel friction device is actuated to. ap pfly tension to the thread and to relieve the thread of tension in definite timed relation. to the operation of the pull-off and the thread looks as will be presently described. The

friction device comprises friction disks 176 and 178 arranged upon opposite sides of the tension wheel 170 and arranged to, clamp the tension wheel between them. The friction disk 17 6. is secured to the side of the bracket friction disk 178 is slida'bly end of the bar is reduced so as to-form a shoulder 180 which is adapted to be engaged by a corresponding shoulder formed on the interiorrof the hub of the friction disk 17 8 and limit the movement of the disk 178 in a left hand direction (Fig-.4) relative to the bar 172.. A compression spring 182 sur rounding the bar 17 2 between the disk 178 and a nut 184s threaded on the bar acts normally to maintain the disk 17 8 engaged with the stop shoulder 180 on the bar except when the bar 172 is drawn to the left, to engage the disk 178 with the tension wheel 170. When the bar 172 is drawn to the left, the disk 178 is first engaged with the tension wheel 170 and the continued movement of the bar thenwithdraws the shoulder 180 from the disk 17 8 so that the tension wheel is then clamped between the disks 176,and 178 by the pressure of the spring 182. {The resistance offered by the friction disks to the turning movement of the tension wheel 170 furnishes the required tension on the thread as it is drawn over the tension wheel. The bar 172 is thus moved longitudinally to aply the friction device to and to release it from the tension wheel by means of a vertical lever 186 pivoted at its upper endt o the 172 an'd fii'lcrumedj with an arm of the bell crank le':ver"1 54=. The

other arm 202 of the rock shaft is connected by a link 206 with the outer end-trap arm 208 extending from a rock shaft 210." The rockshaft 210 is journaled in the fra'rneo'f the machine and is oscillated by mean'sfof a;

downwardly extending arm 212 (see Figi securedthereto, which carries a ca 214 which engages in a-cam groove Cut in the; rear face of the cam Wheel 216 figz ed'toithe main shaft 38. During, the normal 0 eration of the machine the toggle formed 10' the arm 202 of the bell crank lever'a'ndthe link 206 remains substantially unbroken and oscillatory movements are imparted to the arm 198 and the'rock shaft 196 by theoscillation of the arm 208. 'When' the bell crank lever 15st is swung to the right (Fig. 4) tb lift'the presser foot to allow the work to be remtv'ed from the machine the toggle sufiicient thread from the supply for the for;

mation of the succeeding stitc briefly def scribed, consists of a swinging finger 216 which operates between two thread guidin i eyes formed in projections 216 and216 on the upper end of the presser bar, as fully'described in the above application.

During each cycle of o erations, the thread is locked intermittent y between the pull-off and the work and between thep'ull off and the tension respectively by front and rear thread locks 218220 and 212 -244; The front thread lock is actuated to'loc the thread between the pull-off and 'thewor during the operation of the pull-ofi' in pulling thread from the supply for the succe'ed ing stitch. At this time the rear; thread lock is open and during thefirst part of the stroke of the pull-ofi arm the tension wheel is released by'the friction device so th'atth thread may be drawn freely fromhthesupply by the 'pull-ofi'. During the last pai'j;

formed by'the arm 202 of the bell crank 200-202 and thef iqa' setting action of the take-up takes place the shaft 252.

against the upper thread lock.

' The front thread lock which acts intermittently to clamp the thread between the take-up and the pull-otf comprises a thread roll 218 and a thread clamping shoe 220 which engages the thread as it passes over the thread roll. The shoe 220 is formed upon thearm of'the lever 222 pivoted at 224:, which is oscillated to lock and release the thread by means of an arm 226 mounted upon a rock shaft 228 and having a bifursated or recessedvend in which an arm of the lever 222 engages. The rock shaft 228 carries upon its rear endvtwo laterally extending arms 230 and 232 (see Fig; upon which are mounted cam rolls 234: and 236 which run upon two cam surfaces 238 and 240 formed side by side upon the periphery of the cam wheel. 36. By the action of these cam surfaces on the cam rolls 23 i and'236i the rock shaft 228 is oscillated to open and close the front thread lock The" rear thread lock which acts intermittently to lock the thread between the tension device and the pull off consists of a thread roll 242 and a shoe 2% which is arranged to engage the thread as it passes over the thread roll 242. The shoe 2 14 is formed upon the end of an arm 2&6 fixed to the sleeve 194, the rear thread lock being opened and closed by the oscillatory move ments of the sleeve imparted by the mecha nism above described,- With this construction when the bell crank 15% is actuated to raise the presser foot and release the tension the rear thread lock is opened so that the thread may be drawn freely from the supply,

The shaft 38 constitutes the main shaft of the machine from which all the other parts of the machine are driven during}: the sewing'operation. The counter shafts 134. and 92 are driven fromthe shaft 38 by means of an upright shaft 252 journaled in the frame of the machine and driven from the shaft 38 by means of a beveled gear-i fixed to the shaft 38 which meshes'with a beveled gear 256 fixed to the upper end of The shaft 134i is driven from the shaft 252 by means of a spiral gear 258 2Xedto the shaft 252 which meshes with a corresponding gear 260 fixed to the shaft 134. The driving connection between the shafts 252 and 92 consists of the beveled gear 262 fixed to the lower end of the shaft 252 which meshes with a beveled gear 26a fixed to the shaft 96. The driving connec 'tion between the shaft 38 and the shaft 92 During the sewing operation the machine a isdriven by means of the driving shaft 266 (see Figs 1: and'2) mounted in bearings 268 and 270 in the base of the machine and belted to the shaft 38 by means of a belt 272 passing about a pulley 27st on the shaft 266 and the pulley 276 fixed to the end of the shaft 38. The shaft 266 is mounted so that it may be swung, in a vertical plane about a horizontal axis located near the lefthand end. of the shaft to tighten and loosen the belt 272 about the pulleys 274i and 27 6 and-thereby connect the shaft, 38 with and disconnect it from the driving shaft 266. To this end the bearing-268 for the shaft 266 is mounted upon trunnions 27 8 carried by the arms of a yoke 280 formed at the upper and of a bar 282 secured. in brackets 284 on Thebearing 270i for the shaft 266 is also mounted upon bearthe frame of the machine.

inp; pins or trunnions 286 carried by the arms of a yoke 288 formed at the upper end of a slide 290 mounted to slide in guide.

brackets 292 on thefrarne of the machine. The right hand end of the shaft 266 is normally supported in position to maintain the belt 272 in loosened condition by a tension spring 29% attached at its upper end at 296 to the frame and at its lower end to thebearing 270. The right hand end of the shaft 266 is depressed to tighten the belt 272 and thereby establish a driving connection between the shaft 266 and the shaft 38 by means of a treadle 298 pivoted at 306 and having an arm 302 connected by a link 1- vvith the lower end of the slide 290. The numeral 306 indicates a power shaft from which the machine is driven by means of a belt 368 passing about a pulley 310 fixed to the shaft- 266 and about a pulley 312 fixed to the shaft 306. v

The mechanism for stopping the machine is applied to the countershaft 92 of the machine, the slow speed clutch by which the machine is slowed down to a predetermined speed, and then driven in a forward direc-- tion to stopping position, and the brake by which'the machine is finally stopped, being carried by and acting directly upon said shaft. The slow speed clutch mechanism comprises a slow speed driving pulley 314 which is loosely mounted on the shaft 92 and is constantly driven at a definite slow speed in the same direction as the normal direc-.

tion of rotation of the counter shaft by means of a belt 316 passing about said 'pullay and about a pulley 318 mounted on the sleeve 336 in which the pin is secured.

power shaft 306. In the construction illustrated, referring particularly to Fig. 13, the pulley 314 is mounted upon a bushing 320 which is driven tightly into the pulley and is journaled upon a sleeve 322 fixed to the shaft 92. The pulley is held from movement longitudinally of the shaft between a flange 324 on the sleeve 322 and a washer 326 secured to the end of the shaft 92 by a screw 326. The driving member 328 of the slow speed clutchis secured to the pulley 314 by screws 330. The driven member 334 of the slow speed clutch is formed upon a flange projecting from a sleeve 336 which is mounted to rotate with the shaft 92 but is movable longitudinally of the shaft to engage and disengage the members of the clutch. The sleeve 336 also carries a brake member 338 formed on a second flange projecting therefrom which is arranged to engage a fixed brake shoe, 340 on the frame of the machine. The sleeve 336 during the normal operation-of the machine is heldin an intermediate position relative to the driving member 328 of the slow speed clutch and the brake shoe 340 so that both the clutch and the brake are disengaged. In the construction illustrated, the sleeve 322 is formed with a cylindrical hollow boss 342 in which tie-threaded a thimble 344. A pin or stud 346 secured at one end in the flange upon winch the clutch member 334 18 carried passes through registering openings 1n the ends of the chamber formed by the boss 342 and the thimble 344 and a coiled spring 348 is coiled about the pin 346 and interposed between washers 350 and 352 on the said pin. A collar 354 is mounted on the pin 346 between the washer 352 and the flange on I the he outward movement of the washer 350 is limited by its engagement with the head 01 the pin 346 and the movement of the washer 352 is limited by its engagement with the collar 354. The parts are constructed and arranged so that when the sleeve is in an intermediate position on the shaft with the slow speed clutch members and'the brake members disengaged the Washers 350 and 352 are in their limiting positions on the pin 346 in engagement respectively with the head of the pin and the collar 354 and engage the endss'of the chamber formed in the boss 342 and the thimble 344. With this construction the sleeve'336 is yieldingly held in posi tion longitudinally of the shaft but the sleeve may be moved in either direction against the tension of the spring 348 to engage the clutch or to engage the brake.

As above stated, the sleeve 336 is mounted to rotate with the shaft 92 and to this end is secured to the sleeve 322 which is keyed to said shaft. In order to'furnish a reliable driving action between the sleeve 336 and the sleeve 322 the sleeve 336 is formed with racorresponding dially projecting shoulders 356 which engage Shoulders 358 on the sleeve 322 as shown in Fig. 14.

When the stopping mechanism is rendered operative the sleeve 336 is shifted in one direction longitudinally of the shaft 92 at a definite point in a cycle of operations to engage the slow speed clutch, which first acts as a brake to slow down the speed of the shaft to the speed of the driving member of he clutch and then drives the shaft forward at slow speed to stopping position. The sleeve 336 is shifted in the opposite direction to disengage the clutch and engage the brake to stop the shaft at either of two predetermined points in the rotation of the shaft, so that the machine may be stopped at either of two definite points in a cycle of operations.

The mechanism for controllin the engagement of the slow speed clutc and the engagement of the brake comprises a cam groove 360 formed in the sleeve 336 in which engages a cam roll 362 mounted at the end of the arm 364 of a bell crank lever which is pivoted upon the vertical shaft 366. The other arm 368 of the bell crank lever is formed with a recess 37 0 arrangedtoreceive the upper end of a locking bolt 37 2' mounted to slide vertically in the rear end/ofla bolt carrier 374 having a cylindria shank 376 which is arranged to slide hbrizontally in a suitable guide in the frame of the ma chine. A rod 378 havin a head 380 passes through a perforation ii a web 382 at the end of the guide bore in which the shank 376 of the lock bolt carrier is mounted and the jecting upwardly from the carrier with an adjustable abutment screw 390 mounted in the frame of the machine.

During the normal operation of the machine the lock bolt is held down oiit of engagement with the recess 370 in the arm 368 of the bell crank lever so that the lever is normally oscillated idly by the eam.

\Vhen the lock bolt is moved upwardly to engage the upper end thereof with the '4 9H 4 iecess 040 in the arm or the bell crank lever. the hell crank lever is locked to the lock bolt carrier. and through the rotiperative action of the cam groove 360 and the cam roll 362 the sleeve 336 is shifted longitudinally of the shaft 92 to engage aml-wlisengage the slow speed clutch.

The lock bolt 372 vertically in the rear end of the lock bolt carrier and is moved upwardly to engage lock is mounted to slideits upper end with the recess 376 in the arm 368 of th b bell crank lever by'means of a coiled spring 392. down. during the normal operation of the machine through a connection with the treadleand is released and moved upwardly by the spr ng when the treadle is released to disconnect the main shaft of the machine from the; maindriiving mechanism: In the illlistrated construction a block 394 is fixed to the lower end of the-lock bolt and carries ashait1366on which is pivoted a latch 398 I arranged to engage beneath the shoulder 400 upon the rear" end of the lock bolt carrier. ZAII with the yoke 288. When the treadle is depressed to start the machine the end of the latch 398 brings up against the outer face of the shoulder 400 and slides downwardly along said face until the locking pin is .re-

- leased from the recess in the arm of the bell crank lever when the latch 398 snaps in beneath the shoulder 400. When the treadle is released the arm 402 swings upwardly some distance before the latch 398 is disengaged from beneath the shoulder 400 and the locking pin thereby released so as to insure that the main driving mechanism shall be'disconnected from the machine before the locking pin is moved upwardly into 40 engagement with the recess 370 in the arm 368 of the bell crank lever.

The machine is illustrated in the drawings with the parts in the positions which they assume when the machine has been stopped by the stopping devices at a point in a cycle of operations when the needle and awl are out of the work and the presser foot is normally in work engaging position. The stopping mechanism is arranged to stop the machine at this point in a cycle of operations, or at a point about 70 later in a cycle of operations when the awl is in the work and the presser foot is lifted.

Fig. 16 shows the formation of the cam groove 360 as constructed in the present embodiment of the invention. As will be noted from an inspection of this figure the cam groove is formed with a portion 410 substantially parallel Withthe plane of rotation of the sleeve 336 and located adjacent the right hand end of the sleeve looking from the front of the machine. Leading from the portion 410 of the groove is an ingljine 412 which connects the portion 410 .65 ef'iitlrte cam groove with the portion 414 The. lock bolt is held thereof. The portion 414 of the cam groove .alsois formed substantially parallel with the plane .of rotation of the sleeve 33.6, but

is located adjacent the left hand end of the v sleeve. From the portion 414 of the cam groove extends a relatively short incline 416 the direction of inclination of which is opposite to that of the incline 412 and which leads into a portion 418 of. the groove constructed parallel with the plane of rotation of the sleeve. The portion 418 of the groove is connected with tlieportiou410'tlfereof by a second relatively short incline 420 similar to the incline 416. The locking pin is engaged with the recess in the arm 368 of the bell crank lever at a point in the. rotation' of the shaft 92 while the roll 362 is passing through the portion 410 of the cam groove 36. When the bell crank lever is locked to the lockbolt carrier by the lock 35 bolt and the. roll 362 arrives at the incline 412 in the cam groove 360, the sleeve 336 is moved longitudinally of the shaft 92 to engage the slow speed clutch and the clutch remains engaged while the roll 362 is passe an ing through the portion 414 of the cam I groove. During this period of engagement of the clutch the shaft 92 is slowed dowli to the speed of the driving member of the clutch and isthen driven forward at slow as speed by the driving member. The sleeve 336 is moved in the opposite direction longitudinally of the shaft to disengage. the slow speed clutch and engage the brake While the roll 362 is passing from the portion 414 to we. the portion 410 of the cam groove.

When the cain'roll 362 is passing through the incline'412 in the cam groove 360, ,the sleeve 336 is moved longitudinally of the shaft 92 to engage the members of the slow 10 5 6 speed clutch, and then during the/remainder of the progress of the roll thrbughthe incline the bell crank 364368 is swung on its pivot, moving the lock bolt carrier toward the rear of the machine against the-tensicn'lw of the spring 384. To enable the sleeve 336 to be shifted in the opposite direction a distance sufiicient to disengage theslow Speed clutch and engage the brake at some point during the passage of the roll 362 from the portion 414 of the cam groove to the portion 410 thereof, devices are provided for preventing the return of the lock bolt carrier to its initial or normal position while the roll 362 is-passing from the portion 414 of 12ethe cam groove to the portion 410. The inclines 416 and 420 in the cam groove 360 are arranged at definite points in the periphery of the sleeve 336; and the devices for preventing the return of the lock bolt carrier 12:: to its initial position are arranged to stop the lock bolt. carrier in substantially its rearmost position, or in a position intermediate its rearmost and its initial position, so as to render either of the inclines 416 and see These pawls are arranged to be rendered operative alternatively to control the point in a cycle of operation at which the machine is stopped, as will be presently described. During the normal operation of themachine the pawls are swung downwardly from the position in which they are shown in the drawings, their left-hand ends (Fig. 11)

resting beneath a portion of the lock bolt.

carrier below the contact stud 430. hen, after the stopping mechanism has been thrown into operation, the lock bolt carrier is moved toward the rear of the machine by the action of the incline 412 on the roll 362 subsequent to the engagement of the slow speed clutch, one or both of the pawls are swung upwardly intoonerating position in front of the contact stud 430. The pawl 424 is provided with a laterally extending stud 438 whiclfiests in a recess 440 in the lower side of the pawl 426, and is engaged by the rearwardly projecting end of a spring 442 coiled about the stud 428, the other end of which is engaged'beneath a portion of the frame, this spring tending to swing the long pawl upwardly into operating position. This construction enables the long pawl to be controlled by the short pawl and allows the short pawl to be swung upwardly into operating position independently of-the long pawl. The short pawl 426 is connected with the rod 408 by a link 444 having a slot 446 in which engages the pin or bolt 406 which connects the rod 408 with the arm 402. This connection between the link 444 and the rod 408 allows the rod to move upwardly to release the locking pin while the pawls lie beneat-hthe lock bolt carrier. The short pawl is swung upwardly into operating position by means of a tension sprmg 448 attached at one endto the pin 406 and at the other to an extensionon the link 444. When the treadle is depressed to start the machine, both pawls are swung downwardly from the positions in which they are shown in the drawings through their connection with the moved forwardly to its normal position by the spring 384. \Vhen the machine is to be stopped at a point in a cycle of operations when the needle and awl are both out of the work and the presser foot is in work engaging position, both pawls are allowed to rise movement,

bolt carrier is their in front of the stud 430 upon the rearward movement of the lock bolt carrier. The carrier, however, is caught by thelong pawl 4-2l, the end of which projects some dis- 360, the sleeve 336 is shifted on the shaft 92 V to disengage the slow speed clutch and engage the brake to stop the machine. The parts are arranged and timed so that the roll 362 ,engages the incline 416 just before the machine arrivesat stopping position :with the needle and awl out of the work, an(l that the machine is stopped preferably just after the roll 362 reaches theportion 418 of the cam groove when the machine has arrived at the desired point in the cycle. When the machine is to be stopped at a point in a cycle of operations when the awl is in the work and the presscr foot is lifted, the long pawl is held down out of operative position upon the rearward movement of the lock bolt carrier. When the long pawl is inoperative, the lock bolt carrier is caught by the short pawl after it has moved forward some distance from its normal position. The short pawl is arranged to stop the for-' ward movement of the lock bolt carrier after said carrier has moved forwardly during the passage of the roll362 through the incline 416 of the cam groove 360, but before the roll arrives at the incline 420 in said groove. When the short pawl only is operative, the incline 416 in the cam groove 360 will therefore not be effective to shift the sleeve 336 to disengage the slow speed clutch and engage the brake. During the passage of the roll 362 through the incline 420 in the cam groove, the lock bolt carrier then being held by the short pawl from further forward the sleeve 336 will be shifted to disengage the slow speed clutch and engage, the brake to stop the machine. The parts are timed so that the roll 362 engages the' incline 420 in the cam groove 360 just before the machine arrives at stopping position at a point in a cycle of operations when the awl is in the-work and the presser foot is lifted,

and the machine is stopped preferably just

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