US1142391A - Lock-stitch shoe-sewing machine. - Google Patents

Description

H. Alv BALLARD. .l LOCK STITCH SHAOE SIWING MACHINE. y APPLICATIONYFILED .IUNE-Ii'IQCQi.

Patented June 8, 1915.

QH.' A. BALLARD. I LOCKSTlTCH SHOE SEWING MACHINE. APPLICTIQN FILE'J'UNE 16. 1909;

'Patented Jlm s; 1915.

8 SHEETS-SHEET 3.

H.'A. BALLARD. r LOCKSATITCH`SHOE SEWING1MAGHINE.

QfAPPucmon mxo Juni r6. |9o`s.'

Patented June T8, 1915.

A H. A. BALLARD. LOCK STITCH SHOE SEWING MACHINE.V

APPLICATION FILED JUNE 16. 1909.4

Patented June 8, 1915.

8 SHEETS-SHEET 5.

w26 5,5 es

H. A.QBALLARD. LOCK STITCH' SHOE SEWINGv MACHINE.

APPLICATION FILED JUNE 1.6 i909.

Panged June 8, 1915.

8 SHEETS-SHEET vi.

@PIII 72 W Marra@ wzzwn? .H. A. BALLARD. LOCKSTITCH SHOE SEWING MACHINE.

APPLICATION'FILED JUNE i6. 1909. 1,142,391-,

Patented June 8, 19.15;

a SHEETS-SHEET 1'.

:unmmlmlllmlIH-Il "mier Y H-. A. BALLARD.` LocK smcH-sHoEsEwmG MAcHmE.

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Diese S Zara? M 1W w NITED STATES PATENT .OFFICE HARRIE A. BALLARD, OF BOSTN, MASSACHUSETTS, ASSIGNOR T THE BOYLSTON MANUFACTURING COMPANY, 0F SOUTH BOSTGN, MASSACHUSETTS, Av CORPORA- TION 0F NEW JERSEY.

LOCK-STITCH SHOE-SEWING MACHINE.

Specification of Letters Patent.

Patented June 8, 19 15.

Application filed .T une 16, 1909. Sera1No- 502,493.

. of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Lock-Stitch Shoe-Sewing Machines, of which the following is a specification.

This invention relates to shoe sewingmachines of the lock stitch type. In machines of this type, itis customary to employ a shuttle which revolves continuously in one direction located above the needle'in a shuttle race which is open at the bottom for the purpose of admitting and discharging the loop of needle thread which passes over the shuttle. By providing sufficient open space in the shuttle race for the passage of the needle thread, the shuttle is deprived of a supporting structure where it is most needed 20 and considerable diiculty is experienced in supporting the shuttle throughout its rotary,

movement because the periphery of the shuttle is by necessity cut away for the purpose of receiving the loop of needle thread. When the shuttle and shuttle race are cut away, as explained, the shuttle, if not otherwise supported, is liable to unduly Wear the race so that after comparatively little usage the shuttle becomes so loosely confined in the.

race that it dropsA slightly once during each revolution. The objection resulting from so cutting away the shuttle and the shuttle race has in some machines been remedied to a certain extent by providing additional exterior supports for the shuttle. Exterior supports are objectionable because the point of contact and consequent friction are so far remote from the axis of rotation that motion of the shuttle is unduly resisted.

(lne ofthe chief objects of the present invention is-to provide an internal support for the shuttle in addition to the support afforded by the shuttle racc. By internal is meant a point within the circumference of the lshuttle as distinguished from an external support. 4

Another important feature of the present invention relates to the presserfootwhich is employed for holding the work upon a stationary or fixed work table'. In allshoe sewing machines especially those which are operated at high speed, the work is subjected to more or less jerking by reason of the rapidity with which it is fed. Itis of the utmost importance that the work should be so firmly held between the'stagcs of its stepby-step movement that there shall be no possibility of dislodging it so as to displace the awl hole from alinement with the needle. On the other hand the work should be sufficiently relieved for the purpose of feeding it between the periods when the presser-foot is locked. Tha-t portion of the machine to which this feature of the invention rela-tes comprises a movable presserfoot subjected to spring pressure `which causes it to hold the' work table, thereby clenching the work against all possibility of displacement.

In stitching the forepart of the shoe sole,

it is sometimes desirable to employ comparatively short stitches and to place them relatively close to the edge of the work, Whereas in stitching along the shank port-ions of the sole itis desirable to employ comparatively long stitches and to place them farther in from the edge of the work. To those skilled in the art of stitching shoe solesr it iswell known that the object of placing the shank stitches farther in from the edge of the sole is to leave abundant.material between the stitches and the edge for the final edge trimming operation in which the shank is trimmed to a greater extent than the forepart.v v

. A further object of the present invention is to provide means adapted to be manually actuated while the machine is inoperation for varying the length of the stitches and at the same time varying the position of the stitches relatively to the edge of the work. For this purpose a movable work guide is provided together with actuating mechanism connected to a manually operative handle, the changing of which effects a change in the extent of movement imparted to the work-feeding means. The work guide and work-feeding means and their adjusting devices are so related that, when the handle is moved so as to increase -the length of the l l tion of a complete sewing machine with stitches,` the work gliideais retracted so as to provide more space between the stitches and the edge of the work.

4vStill another feature of the present 1nvention is embodied ina spring takeup device 'for the locking thread of which the supply is contained within the shuttle.

appended claims.

foregoing Afeatures-as well as addi-A tionll features are hereinafter described in detail, illustrated upon the accompanying drawings.and-particularly set forth lnthe Of the accompanying drawings which illustrate one form inwhich the invention may be embodied,'Figure 1 is -a front elevapower transmitting mechanism. Fig-2 is a front elevation of detached mechanismin- .cludin the stitch-forming mechanism and workeedin mechanism in their correct reiv lation -to eac other. Fig. 3 is a sideeleva-fv tion as seen from the right of Fig. Fig.v

VA4 isa front elevationof va portionf the Work-feeding mechanism. Fig. l5 1s a side 'elevation and partial section a's seen from @the right of the feeding mechanism, the

`work-gage mechanism, the presserfoot mechanism, and thread-locking mechanism. Fig. 6 is a side elevation as seen from the left of the presserfoot mechanism, thread-lookin mechanism and takeup mechanism. Figs.

and 8 are elevations as seen from the left of fragments of the presserfoot locking mechanism .in diferent'positions. Fig. 9 is a detail of the stitch-forming mechanism. Fig.

l0is a section on line 10510 of Fig. 9. Fig. 1-1. Vis another detail showing an advanced 'stage of forming .a stitch. Fig. 12 is a side elevation as seen from the left of detached mechanism including the takeup mechanism, looper mechanism,thread-measurlng mechay nism, and work guide mechanism. Fig. 13 is a side elevation as seen'from the left of gearing forming a part of the looper mechanism. Fig. 14 is a ,top planview of said gearing'.v Figs. 15 and 16 are top plan views of the looperin different positions. Fig. 17 is atop plan'view of the work table and work guide. Fig. '18 is a front elevation of the -shuttle race and portions of the needle and awl mechanism. Fig. 19v is a section on 1ine19--194 of Fig. 18. Figs. 20 and 21 are y `'respectively a front elevation and right side elevation of 'a cam which actuates the interior. shuttle support. Fig. 22 is a front elevation of the shuttle alone.v Fig. 23 is a section on line 23,-23 of'Fig. 22; Fig. 24 is an elevation of'. the open side ofa bobbin case adapted to be inserted in the shuttle. Fig. 25 is 'a section online 25-25 of Fig. 24.

Fig. 26 is a perpendicular section of a bob-V bin adapted to fit' within the bobbin case. Fig. 27 is an elevation ofthe member-,which l supports the shuttle internally. Figs. 28

and 29. are perpendicular sections of the carriage. `-'the mechanism shown byFi 32. Fig. 34 1s shuttle, vshuttle driver and shuttle support in different positions. Fig. 30 is a front elevation of the shuttle race and shuttle mechanism in the act of forming a stitch. Fig. 31 is a top plan view of the looper mechani`sm.' Fig. 32 is -a top plan view of the needle and awl mechanism together with fragments of the 'supporting frame and feed l Fig. 33 is a left side elevation of a sectionon line 34-34 of ig. 33. Fig. 35 is'a side elevation of the needle mechanism.

F-ig. 36 is a side elevation as seen from the p left, of the awl mechanism and a fragmcntof the feed carriage supporting the same. Fig.

37 a section on ,line 37-37 of Fig. 32.

38 is a perpendicular longitudinal sec- 'tion of stop mech'anism-f0rl controlling the @stopping of the machine. Fig. 3,9 is a top plan view of the stop mechanism. Figs. 40 and 4l are elevations o'f centrifugal governing mechanism in the two positions occupied .respectively when the machine is at rest and 111 operation. Fig. 42 is 'an elevation of the cushioning'spring which causes the stopping of the prime power shaft.

l The same referencel characters indicate the,

same par-ts wherever they occur.

Referring now to Fig. 1, there is illusl trated a form of shoe sewing machine of the lock stitch type which illustrates a convenient manner in which the several features hereinafter explained may be applied for the purpose of carrying out the present invention. It should be understood, however,

that the invention is not limited to this precise form of machine but that severalmechanisms herein illustrated may well be modi-4 fied to meet certain requirements without departing from the spirit and scope ofthe invention. On Fig. 1 is shown a head or frame 10 on which are installed the several operative mechanisms rand which is shown as, mounted on a base or standard' 1l. ower-transmitting mechanism is shown and includes a countershaft 12 provided with the usual tight and loose'pulleys 13, 14

vand with cooperative clutch members 15 and be splined and' of .1 15

head 10. Mechanism for controlling the apl plication of power is' hereinafter explained. The/head 10 Includes the lowerhalf 19 of a dlvided cylindrical casing of which the ons 19 'and-22, surrounds the portion of the shaft 2O between lthe earings 21 and forms a chamber, for inclosing the several cams and 'gears by which i uppcrhalf is indicatedat 22. The casing, .comprising the porti lpower is distributed to the several mechanisms. The casing being divided on a line level with the axis of the power shaft, provides a receptacle for containing an abundance of lubricating oil in which the several cams and gears may be immersed.

Needle mechansm--The needle employed, which is indicated at 23, is of the hooked oscillatory type and is illustrated in detail byv Figs. 32 and 35 inclusive. The needle is mounted on a carrier 24 to which it is clamped. by a bolt and clamping plate 25. The carrier is 'formed with a cylindrical boss 26, which forms its bearing, about the axis o'which it is adapted to oscillate. The boss 26 lis surrounded by two members 27 which constitute a split bearing and which are inserted in an aperture formed in a projecting bracket 28 formed on the head 10. '1 he outer end of the boss 2G is formed with an external flange 29 which confines the two members of the plit bearing against endwise movement. The bearing so assembled may be secured in the bracket 28 as hereinafter explained.

MUZ arrachement-,30 indicates an awl which is likewise of the oscillatory type and which is clamped upon a carrier 31 by means of a bolt 32 and clamping plate 32. The needle carrier, as hereinafter explained, re-y ceives oscillatory motion but is positively held against axial motion while the awl carrier receives oscillatory as well as `axial motion. By reason of so actuating the awl and needle, the awlis adapted to penetrate the work at a relatively distant point to feed the work toward the needle and to recede from the workso as to leave the awl hole in alinement with the needle, and while the needle is vin the work, the awl is adapted to be returned to its relative distant position so that upon subsequent oscillation it is adapted -to enter the work at a fresh point. The awl carrier and needle carrier are coupled by a central pin and socket telescoping connecticni whereby they are positively maintained in axiay alinement with each other.

and they are furthermore coupled by eccentric pin and socket telescopingconnection whereby they are caused to oscillate in unison. In this form oscillatory motion is imparted directly to the awl carrier and motion is transmitted through the eccentric connection tol the. needle carrier.

The awl carrier is mounted in an arm 33 formed upon aeed carriage 34 by means of a split bushing or bearing 35 similar to the bearing27 of the needle carrier, see Fig. v37.

.For this purpose the awl carrier is formed with a cylindrical boss 3G at the outer end of which is an external flange 37. The two portions of the split bearing are assembled upon the boss 36 betweenthe flange 37 and the carrier, and the parts thus assembled are inserted in an aperture 33x formed in the outer end of the feed carriage arm as shown by Fig. 34. One of the parts o1" the split bearing is securely locked in the arm 33 by a screw or pin 33 such as that indicated in Fig. 37. The same form of locking device is employed as shown by Fig. 34 for fastening the split bearing of the needle carrier hereinbefore described. For this purpose the said part of the split bearing is formed with a `notch in its periphery adapted to receive the locking pin. rhe bearing member thus engaged by the locking pin is held by the pin against axial movement, the interior boss is held against axial movement by the part of the bearing which is pinned and by the ianges at the ends of the boss, and the complemental part ot' the bearing is therefore held against axial. movement by reason of its confinement between' the said flanges of theboss. This form of bearing obviates the use of bolts or screw studs usually emplcyed at the ends ot' the needie and awlbearings and provides a neat and strong mounting which requires but a comparatively small space.

By reference to Fig. 34 it may be seen that the two carriers 24 and 31 are located between their supporting bearings. The inner side of the carrier 31 is formed with a central cylindrical pin or stud 39 which extends into a socket 40 formed in the inner end of the boss 2G of the needle carrier. The feed carriage 34 is movable in parallelism with the axis of the needle and awl carriers and the said carriers therefore have a central pin and socket connection with each other.

The inner side of the needle carrier Q4, see Fig. 3,5, is formed with an eccentric pin or stud 41 which extends into a socket 42, see Fig. 3G, formed in the inner face of the awl carrier 3l. By this means the two carriers'have eccentric pin and socket connection with each other by reason of which oscillatory movement o'l'| one is transmitted to the other. The awl carrier 31 is :formed witha series of spur teeth 43 which form a gear segment by which it may be oscillated.

Figi'. 3 illustrates actuating mechanism for oscillating the awl carrier, said mechanism including` an arm 44 pivotally mounted upon the shaft 45 at the rear of the machine and provided with teeth 4G forming a gear-segment in intermeshed relation with the teeth 43. The arm 44 is pivotally connected at 47 with the actuator 4S which has the form of an eccentric rod and which embraces an eccentric 49 atlixed upon the power shaft 20.

The means for mounting the awl carrier may be reinforced as shown by F ig. 37, for the purpose of more firmly supporting the awl carrier. Said means includes coperative interlocking segmental rings 50 and 51 of which one maybe affixed to the feed carriage arm 33 and the other to the awl caraixed to the awl carrier.

50- is aixed to the arm 33 by means such as rivets 52, and the ring 51 1s likewlse is formedwith an exterior flange 53 which overlaps and contines an interior flange 54 formed on .the ring 51. The ring 51 is furthermore confined-by'a concentric flange 55 formed on the arm 33 of the feed carriage. By this arrangement of interlocking flanges the awl carrier is abundantly supported so as to enable it to withstand the lateral strain,

imposed upon it by the feeding of the Work,

The bolt 32 is braced by the ear 33 of the,

arm 33. y

Needle guide or support-The needle 1s provided with a movable guide or support 56 which is mounted upon an oscillatorycarrier 57. The carrier. 57 as shown by Figs. 32 and 34, is mounted upon the exterior of the split bearing 27 between the needle carrier and the bracket 28. The carrier 57 is adapted to oscillate about the needle axis independently. of the needle carrier and is actuated so as to cause the guide or support 56 to follow the needle in approaching the Work'and to recede with the needle When the latter is "withdrawn fromthe work. For

this-purpose.` is provided an actuator shown in Figs. 3, 32 and 35, vsaid actuator having thel form of a\link 58. One end of the actuator is pivotally connected to the swinging arm 44 as indicated at 59. The other end of the link 58 is formed with a cylindrical knob 60 which occupies a cylindrical recess 61 formed in the inner face of the carrier 57,

see Fig. 33.

W orcfeeding mechansm.-The feed carriage 34 upon which the awl is mounted is arranged in guides 34 on the head 10, see Fig. 1. It is reciprocated by a lever 62 pivoted at 63 and having at one end a roll 64,

see Fig. 5, coperating with the cam 65l formed in a cam disk 66 affixed upon the shaft20. The other end of the lever 62 is formed with a segmental slot 67 which is occupied by a pivoted block'GS carried at the free end of'an arm 69. The arm 69 is pivotally mounted at upon the feed carriage 34 and is adjustably clamped Vto a handle- 71 by which it may be moved about its pivot so as to move the block 68 toward or from the fulcrum 63. The feed lever 62 receives oscillation of a uniform length from its cam and it imparts reciprocatory motion of variable length to the feed carriage by reason of the adjustable connection therewith through the movable block 68. .The curvature of the slot 67 is such as to be concentric With relation to the pivot 70 when the feed carriage is at the left hand extreme ofl its movement, in which lposition the awl is in transverse, alinement with the needle.

The limit of movement of the a'wl away from -alinelnent with the needle is f varied by swinging l the handle 71 and the arm 69 The inner ring 50 which the needle and aWl the line of the needle.

about the pivot 70. This adjustable capacity of the feed carriage connections effect a variation in the length of the stitches by reason of irarying -the length of the steps in the intermittent movement imparted to the work and this means of adJustment 1s further employed for the purpose of gaging the distance at which the stitches are formed relatively to the edge of the worln War-7c guide 07' gaga-Referring now tov Figs. 2, 9,'12 and 17, 72 indicates a stationary work rest or table. The vtable'is formed with an elongated aperture 73 through aSS in entering and leaving the 'Work Tlibwork" isv held upon the upper surface of the table by a presserfoot 74 hereinafter described in devtail and` illustrated best by Fig. 9.1 75 is a work guide or gage which isl adaptedjto be engaged by the edge of the .Work for' the purpose ofmaintaining thework in correct position relatively to the needle and awl. The work guide is movable 4from fro'nt to rear for the purpose of permitting adjustment for varying the distance of the stitches from the edge of the work. As shown by Figs.,5 and 12, the Work'guideis formed upon one end of a sliding member Which- 1 the handle about the pivot 70=causes movement of the work guide toward or from Said 'universal connection comprises a member -SO pivotally mounted in a boss S1 formed upon the rear side of the 'handle 71. The boss 81 extends through an aperture 82 formed in the feed carriage. The member 8O isv pivotallyconnectcd with one end of a. link 83 the other end of which is a socket yadapted to receive the spherical end S4-of a stud- 85 carried by the arm 7 9. By means of this form of connection, the work guide is retracted from the line of the needle when the handle 71 is moved so as to increase the length of the stitches, and is moved toward the 'line of the needle when the handle is moved to diminish the length of the stitches. The position of thev Work guide is not affected by the reciprocatory movement of the feed carriage 34 and such movement of the carriage is made possibleV Without disturbing the arm 794 by reason of providingithel ball,- and socket joint described at 84.? The relative ydegree .of movement of the Work guide may be increased or diminished by adjusting the studv85 toward oi" from the rock shaft 78. For this purpose the arm 79 is formed with a segmental slot 86 in which the stud 85 is adjustably clamped. i

.Y [i"esscrf00t.'l`he presserfoot 74 is fixed at one end of a presserfoot lever.87 and is adapted to engage the upper surface of the work and hold the work upon the'work table 7 The lever 87 is pivoted in the head 10 at 88 and is formed with spur teeth 89 which form a gear segment concentric to the axis of the pivot 88. The segment 89 has interineslied relation with the teeth of a pinion 90 loosely mounted on the shaft 15. The pinion is aiixed to a drum 91 also loosely mounted on the shaft and containing 'a coiled spring 92 of which one end is aliixed to the hub of the drum'and of which the other end is attached to a fixture 93 on the head 10, see Fig. 6. `The tension of' the spring is applied tothe pinion 90 in such a way as tocause the presserfoot to normally clamp the Work against the Work table, and at no time is the tension of the spring relieved by automatic means. For the purpose of raising the presserfoot from the table in o'rder to facilitate the insertion and removal of the Work, the lever 87 may be manually retracted by means of a handle 94. During the greater part of the time inwhich. the

' machine is in operation, the presserfoot lever is positively locked` against retraction by means hereinafter described and is unlocked twice during each cycle of movements at one time for the purpose of permitting feeding of the work. and at the other time when the machine is inthe position which it occupies when finally brought'to a state of rest in order that it maybe ready for manual retraction by means of the lever 94.

The periphery of the drum 91 is provided ,u ith ratchet teeth 95 which are adapted to lie engaged by a plurality of cooperative teeth formed upon a paWl 96 carried by a lever 97. The pawl is pivotally mounted in the lever as at 98 and the lever is pivotally mounted upon a fulci-um 99. The lever 97 is provided with a roll 100 which is adapted to coiperate with a cam on the vshaft 20. rI"he cam for this purpose may be formed with u' groove or path for the reception of the i'oil 1,00 or may be formed with periph` vii-lvindeiitations as shown by Fig. 6 in which the cam is indicated atrlOl and the iineutations at l102 and 103. lVhen the latter formA of cani is eiul'iloyed a spring 104 rovided for moving the lever in Ione di- W hen the' shaft 20 is at its initial position,

ion' so as ,t'o maintain the roll 100 in conthe indentation 103 of the cam 101 permits the spring 104 to retract the lever 97 so as to disengage the pawl 96 from the ratchet teeth 95. `When the pawl is thus retracted, the presserfoot lever is free to be manually retracted against the tension of the spring 92 for the purpose of permitting insertion and removal of the Work. Wlen the lever 97 is actuated against the tension of the spring 104, the ratchet teeth 95 are engaged first by the foremost tooth 107 of the paWl, and continued movement of the lever 97 causes the succeeding teeth of the pawl to enter between the teeth 95 thus rocking the paWl about its pivotVv 98 a ainst the tension of the spring 105. The al movement of the lever 97 during which the pawl is rocked as described, causes a slight rotary movement to be imparted'to the drum 91 which movement is transmitted to the presserfoot lever'through the pinion 90 and causes the presserfoot tc more firmly clamp the Work upon the Work table. `In this Way the continuous yielding pressure of the presserfoot upon the Work is reinforced by a slight additional positive pressure and the presserfoot is securely locked against retraction so long as the pawl remains in engagement with the teeth 95. The indentation 102 of the cam '101 permits retraction of the lever 97 and consequent releasing of the drum 91 immediately prior to feeding movement of the feed carriage 34,thus relieving the work or" the additional pressure previously imposed upon it. After the feeding movement of the carriage, the lever 97 is again actuated so as to clamp the Work with additional pressure and to lock it against retraction during i the remainder of the cycle of movements until the shaft 2O once more arrives at its initial position.

(/lmiip'rig 'mea/fzs foin needle thread-.- The needle thread, see Figs. 6, 9 and 30, may be drawn from any convenient source of supply, prcferably at the rear of the machine. The thread, which is indicated at a, is preferably waxed and is drawn from a suitable tension roll b shown'in Fig. 6. After passing over the tension roll, the thread passes through a clamping device, a takeup device, and a' loopcr all of which are hereinafterv described. The clamping device is mounted upon the presserfoot lever 87 and is bodily movable. It comprises a clamping roll 108 and a lever 109`pivoted -at 110 to the lever 87. The thread passes between the roll 108 and a block 111 affixed to the lever 109, and is normally clamped by spring tension exertnil byA aspring 112 of Which one end is connected to the lever 87 and the other end to 4an arm of the lever 109. The clamping action of the block is continuous except as hereinafter explained. The clamping lever 109 is provided ivith a projection or a roll 113 which is adapted to be engaged by a 35 pivotally connected to one end ot' a link 127,

curved arm114 forming a partei a llever 115. The lever 115 is mounted upon the shaft 45 and has at its 4fr'ee end a-roll 116 which occupies a cam groove 11'( formed in the cam disk 66, see also F ig.V 5. The arm v114 is retracted from the roll 113 during the major portion of the cycle of movements but is actuated twice during cach revolution of the shaft 20 for the purpose of retracting the love-r' 109 and opening the thread clamp. A shoulder 118 in the cam 117 opens the thread l clamp when the shaft 20 is at its initial position and a shoulder 119 insaid cam opens the thread clamp for the purpose of permitting the shuttle to draw from the supply a quantity of thread a as hereinafter explained. 'Ihe arm 114 is so curved as to be i concentric to the pivot 88 of the presserfoot movetoward and from each other.

when the thread clamp is open and is thus.y adapted to maintain the clamp in open posi#4 tion when the -presserfoot lever is moved about itsk pivot. f Y

Taleup 'm.echam'sm.+-The takeup mechanism herein shoWn for thel thread a comprises a pair of'oscillatory arms 120, 121-, see Figsf.

. 6 and 12.- Said arms are mounted upon a stud -122 and are actuated simultaneously in opposite directions so as to cause, them to The arm 120 is provided with a bell crank -arm 123 which is pivotally connected to one end of a link 124 of which the other end is'pivotally connected to an actuating lever 125. The arm 1h21 is likewise provided with a bell crank arm indicated at 126, said arm being of which the other end is pivotally connected to the lever 125. The lever 125 is loosely mounted upon the lshaft 45 and is provided with a cam roll 128 which occupies a cam groove 129 formed in a camdisk 180. The arms 120 and 121 are provided respectively vwith thread rolls 131 and 132. The thread rolls are s o arranged that those of one .arm are adapted to enter between those of the other arm in alternate order. The thread passes from the clamping roll 108 over an idl'eroll 133 mounted upon the presserfootf -lever and thence to the series of` thread rolls on the takeup arms. When the takeup arms are in closedposition the thread is permitted to pass between them in a rectilinear course .but when they areopen, as indicated on the drawings, they fonn a series of zigzags in the thread and thus draw down the loose thread from the stitch-forming mechanism. The form of connection between the actuatv ing lever 125 and the link 124 includes'avl curved slot 134 in which the connecting pivot is clamped. By adjusting the pivot toward or from the fulcrum 45,.the lever 125` may be caused to impart more -or less movement to the takeup arm 120 and in thisl way vary the capacity of the takeup mechanism.

-of an upright shaft 141. The shaft 141iis rotated ,intermittentLy in one direction so .l

as to cause the looper to move to the two positions indicated by Figs. 15 and 16. The looper moves through a circular path inthe opposite direction to the path through which the crank 140 moves, and it is driven first through approximately 120 of a circle andthen through the remaining 240'to its initial position.v .The initial position of the looper is'shown'by Fig. 16 in -whiclr it is in erpendicular alinement with the needle.

he first movement imparted to the Vlooper carries it to the position shown by Fig. 15

- where it remains stationary during feeding of the work, after which the needle is moved; downwardly vtovreceive a loopl ofv thread.` While the needle is in its lower position,`

the looper is moved 'through the second stage from the position shown by Fig. 15 to that shown by Fig.' 16 ir the direction of the arrow for the purpose of laying a loopof thread upon the barb of. the needle. .-The looper,.after arriving at its initial position, remains stationary in alinement with the needle while the vneedle is retractedthrough the work.

The means for driving the shaft 141in;l termittently in' onev direction ycomprises a pair of spiral ears 142 and143 off'which the former is a xed to the upper end of the shaft 141 and off which the latter 'is affixed to the shaft 20. AThe gear 143 is formed with two' series of teeth indicated at 144 and 145. Both end s of .said yseries are Joined by peripheral ribs' or anges 146 and 147.v The series 144 of'the largergearV is adapted to intermesh with a series of teeth 148of. the smaller gear, while the seriesof teeth 145 is adapted to yintermesh with the series of teeth 149. The series 148;. and. 149 are separated by grooves orvindentations 150 and 151, said grooves being respectively adapted to receive the ribs-146 and '147; The looper, as formerly stated, is first moved4 through a relatively short arc and thenthrough a relativelylong arcin describlnga circle, and for this reasonv the several series of eoperative spiral teethv are made of'unequal length as indicated by Figs. 13 and 14. TheA two series 144 and 148 which coperate move the looper*` through a relatively short arc, While the longer series 145 and 149 move the looper through a relatively long arc.

Tlv/'cad measuring device-In Figs. 9, 10 and 12, 152 indicates a thread-measuring device which is adapted to engage the needle thread between the looper and the needle for the purpose of drawing the quantity of thread which it subsequently delivers to the needle, while the needle is being retracted through the work. The measuring device is in the form of a rod of which one end is formed as a hook as shown by Fig. 10, and of which the other end is loosely mounted in a stud 153 mounted in the head 10. Between its ends the member 152 is mounted by means of a suitable pivoted connection in one end of an actuating lever 154. The lever is mounted upon a fulcrum indicated at 155 and is provided with a cam roll 156 which cooperates with a cam groove 157 formed in the cam disk 130. The cam actuates-'the lever 154 so as to reciprocate the member 152 forward and backward as hereinafter explained.

Shuttle Vmechrmsm.-'The locking thread,

which is indicated at .fc in F 30, is wound labout the central core of a bobbin 159 such as that illustrated in Fig. 26. According to this form of the invention the bobbin is tained in the chamber 163 formed in the front side of a shuttle 16:4. The shuttle is formed with a rear wall 165 in which is a central aperture 166 whose function is hereinafter explained.A 'The periphery of the shuttle is formed with a vrib or flange 167 ywhich is adapted toy tit in a` groove 16S formed in a shuttle race comprising separable parts 169 and 169x. The shuttlerace is cutaiiay on one .si/def'so las to provide a fre l "for the reception of a drliler 172,*see 141g.

space within the circular irition of the race l19.v The driver is formed oirfone end of a shaft 172 which is arranged'fi'-suitable bearings in the head 10 of which one is indicated at 173 in Fig. 19. The shaft is driven continuously in one direction indicated by arrows, at a uniform speed, and for this purpose its rear end, seeg Fig. 3, is provided with a spiral gear 171 which is driven by a spiral gear 175 on the shaft 20. rl"he driver is so formed as to provide a clear space 176 between it and the rear Wall of 'the shuttle, as indicated by Fig. 29, and it ywhich rotative movement is imparted to the shuttle. By reasonof cutting away both the shuttle and the shuttle race, as shown and explained, the shuttle is not sufficiently supported by the race during a portion of its cycle and it is therefore desirable to otherwise support the shuttle vin order to prevent it from sagging or dropping into the gap at the bottom of the race, and thus in time wear away the race and render the shuttle unfit for use. For this reason an auxiliary supporting device 1'79 is mounted upon the driver by means of a pivot pin 180. The support 179 is adapted to oscillate about the pivot and is formed with ahead 181 which is adapted to enter the aperture 166 in the rear wallA of the shuttle. lVhen the head 191 occupies said aperture, it is adapted to engage the wall of the aperture and thus confine the Vshuttle centrally within the race.. lVhen the auxiliary support isin engagement with the wall of the aperture, it bridges the space 176 at the rear of the shuttle and would thus form an obstruction lto the passage of the vneedle thread unless retracted.v As shown by Figsf28 and 29, the driver is adapted to guidethe needle thread into the space. 17.6 so that the thread cannot become caught on thevmember 179. A member 182, located within the part 169* of theshuttle racc. retracts the support 179A to enable the needle thread-to pass through the-space 176 and returns said support to shuttle-engaging Vposition when the. needle thread has passed. the forni of a cap ani is atlixed to the bearing 173 andprovided with an aperture for the driver shaft 172. The cap is formed with an end camlSB and with a peripheral cam 181. The supporting member `179 is formed with faces 185 and 186 which cooperate respectively with the stationary - cams 183 and 181. The supporting member in revolving with-the driver is projected by ther-am 183 and retracted by the cam 194. said cams being so related toeaehother as to actuatc the Acupporting member positively Said member 1S2'is in member should be the wall of an aperture for it might welll beany other form of shoulderoceupying an equivalent relation. According tov this invention the bobbin ease 160 is provided with atension device and with a spring takeup for the thread The tension device is in the form of a leaf, spring 485 and the takeup device is shown as a spring hook 186. 'lhe thread drawn from thebobbin passes first through the slot 162 in the wall of the bobbin case, thence through a groove 187 in the front wall of the case,.thenee between the tension` spring 485 and the front wall of the bobbin case, through the spring hook of the takeup 186, through an aperture 188 extending through a nose 189 on the bobbin case and thence to the work. 'The nose 189 is engaged by a retaining arm 1.9() which serves to retain the case in the chamber 163 of the shuttle and it also holds the case'against rotation.v The arm 190 is pivotedat 191 to ears formed on the shuttle race and is adapted to be engaged and locked by an overlapping bolt 192 pivoted at 193. The free end of the arm 190 is bifurcated as shown by Fig. 3, and is adapted to straddle the nose 189. i

'Loop opening meeham'sm.-In'Figs. 2, 3 and 30 is illustrated a finger194 which is adapted to engage a new loop ofthe needle thread for thepurpose of opening the loop for .the introduction ofthe nose of the shuttle. The thread-engaging end of said linger is formed as a hook and the other end is adjustably clamped in one end of a lever 195. The lever is pivotally mounted in the -head 10 upon the stud 155 which forms the ulcrum of the thread-measurer-actuatinglever 154. The lever 195 is provided with a cam roll 196 which coperates with a cam groove 197 formed in thc cam disk 66. The finger 1.94 initially occupies its lower-most position in the path of the nose of the shuttlel and is raised as the needle approaches its uppermost position. In this way the hook at the end of the finger removes the newly formed loop of thread a from 'the needle and spreads the bight of the loop as indicated by Fig. l1, so as to provide for the entrance of the nose of the shuttle into the loop.

, Stitch-forming 07e1'at'0n.-Suitable mech- I anism hereinafter deseribedis provided for stopping the shaft 20 at a predetermined initial `position when the power 1s discontinued. VVhen'the shaft and the various invstriunen'talities hereinbefore described, oc-

cupy their initial positions, the needle and awl are both clear of the work, the presserfoot is unlocked and the thread clani'p is held open in order that the work may be readily inserted or removed by manually retracting the presserfoot against its spring tension. At this time the needle and vawl are y approximately midway between ltheir twol extremes of oscillatory movement, the looper is in perpendicular alinement with the needle, the thread-measuring device is midway between the extremes of its forward movement, the presserfoot is unlocked, as already stated, the loop-opening linger is at its lower position, the take-up arms are separated, the nose of the shuttle is at or near its lowest position, the feed carriage and awl are yat the right hand extreme of their range of movement land the clamping device for the needle threadis open. In inserting a piece of work, the presserfoot is manually itetracted by means of the handle 94, the work is placed upon the upper surface of the work table in contact with the work guide, and the presserfoot handle is then released whereupon the presserfoot immediately clamps the work upon the table. When a sufiicient quantity' ofthe threads a and :u are drawn out and the ends thereof are momentarily held upon the work, the machine is ready to be set in operation. The powercontrolling mechanism, hereinafter descrlbed, ma then be actuated to start the shaft 20. en the shaft is set in motion,

in entering the work. Meanwhile the takeup arms 120 and 1.21 begin to close for the pur- 105 pose of providing sufficient loose thread for a loop to be placed on the barb of the needle. The thread clamping lever is released so that the tension of the spring 112 may be applied to clamp the thread as Ahereinbefore described. The thread-measuring hook advances .to its forward osition and the presserfoot is again1 unloclied upon the completion of upward movement of the awl. The feed carriage is then moved to the left and 115 the awl, which is initially distant from the line of the needle, is thus moved into alinement with the needle preparatory to downward movement. At the completion of the feeding movement, the presserfoot is #again moved slightly toward the work table `and locked so as to hold the work firmly during the operation of the stitch-forming instrumentalities. The needle and awl are now oseillated downwardly in alinement with each other and the needle enters the work in the aperture formed by the awl. During the downward movement of the needle the looper is moved from its initial osition in alinement with the needle to the, erwardl 1130 position s hown by Fig. 15. When the needle reaches its lower position, the takeup arms 120, 121 are completely closed and the thread-measuring hook is at its forward eX- treme. While the needle dwells momentarily in its lower position, the feed carriage is moved to the right thus moving the awl out of alinement with the needle and into a position where it may enter the work at a fresh point. The thread-measuring hook and the looper then move nearly simultaneouslv, the former moving to the rear and engaging the thread a between the looper and the work table and drawing back a quantity of thread, as indicated by Figs.V 9 and l0. Meanwhile the looper moves from the position' shown by Fig. 15 to the position shown by Fig. 16, thus laying the loop of thread about the barb of the needle as shown by Fig. 9. The looper then stops in alinement with the needle and the needle begins to rise to pull the newly formed loop through the work.

During the upward movement of the needle, the thread measuring hook moves forward and thus delivers a measured quantity of thread to the needle in order lto avoid drawing the thread through the barb thereof. The takeup arms are in the act of closing and the thread clamp is opened and closed before the needle reaches its upper position. The operation thus far described deals with the instrumentalities which. are active in performing the necessaryy operations during the first cycle of movements,

, and the second cycle and each subsequent cycle brings into play other instrumentalities Whose functions are now described in the following explanation of a subsequent cycle. l

Assuming that the various instrumentalities after having completed the first cycle of movements, arrive at their respective initial positions, the order of procedure is as follow's:-The needle with a loop of thread in its barb and the awl which is in position to penetrate the work at a fresh point continue to rise in unison so that the needle emerges from the upper side of the work and the awl enters the luder side of the work immediately thereafter. At this time the takeup arms are in the act of closing, the thread clamp is vpermitted to close, the presserfoot is locked and the loop-opening hook engages the loop of thread upon the needle and spreads the loop as shown b Fig. 1l. Meanwhile the nose of the shuttle, which is moving continuously in a counterclockwise direction, enters into the loop as shown also by Fig. 30 and removes the loop of thread from the hook finger. Leaving the description of the shuttle operation temporarily, the presserfoot isagain unlocked and the work is fed by movement of thefeed carriage and awl. After the feed- .ing movement the presserfoot is locked and the awl starts toleave the work, and the needle moving in unison therewith, starts to enter the hole vacated by the awl. During the preceding movements the thread clamp is closed and the nose of the shuttle which is now' rising continues to draw the loop of thread, thus setting the preceding stitch if in fact there is one. The hooked linger which delivers the loop of thread to fresh supply of the thread a for the nextstitch. As the nose of the shuttle approaches its highest point, the auxiliary shuttle support, which has hitherto. been maintained in supporting position in the central aperture of the shuttle, is retracted by the action ofthe cams 183 and 184 to permit the passage of the needle thread about the rear of the shuttle. When the nose of the shuttle reaches its highest point, the takeup and thread clamp are both closed. The nose of the shuttlev now starts to descend on the other side of its perpendicular diametrical line and the takeup starts to open so as to draw down the needle thread and take up the excess caused by downward movement ofthe nose of the shuttle. At this time the feed carriage and the awl move again to the right and the looper and thread-measuring hook are actuated as hereinbefore described, for the purpose of laying a new loop of thread about the barb of the needle which now occupies its lower position. The nose of the shuttle continues to -descend 'and the takeup continues to open thus drawing down the previous loop of thread so as to draw it out of 1 the path ofthe shuttle. The thread so drawn'is now interlocked with the bobbin thread and the nose of the shuttle is at or near its lowest point and is approaching the hooked loop-opening finger which is now about to remove another loop of thread from the needle. The takeup arms, previously opened for the purpose of drawing down the interlocked loop of needle thread,`

are now open and the upwardly moving needle is fully supplied with thread both from the takeup and from the thread-measuring device which is moving forward. Continued motion of the several instrumentalities causes them to form successive stitches according to the operation now fully described.

It is apparent on Figs. 22 and 30 that the chamber 163 in the shuttle provided for the reception of the bobbin case is eccentric wit'A relation to the axis of the shuttle.

.through the r,outletin the bobbin case and through the tensioh spring 485, the spring takeup 186 and the aperture 188 in the nose of the bobbin case. The result of rotary.

movement of the bobbin out the axis of the shuttle is to draw the thread out by a. succession of impulses. The action of the .spring 161 .within the bobbin case serves not only as a tension upon the thread but. as a friction brake for preventing the bobbin from continuing to turn about the stud 159 as-would otherwise' be the case on account of the momentum imparted to the bobbin when the bobbin thread is drawn. It is apparent that the yielding tension of the takeup spring 186 serves to hold the thread a: y

in a taut conditionbetween the Work and the tension spring 485.

The means hereinbefore mentioned for causing the driving shaft 20 to stop at a. predetermined initial position is illustrated byv Fig. l and Figs. 38 to 42 inclusive. The cooperative clutch members 15 and 16 arranged upon the countershaft 12 at the rear of the machine are adapted to be moved to and from operative relation by a fork or yoke 198 mounted upon a shaft' 199. The

shaft is provided with a treadle 200 by which it may be oscillated in one direction and thefork 198 is connected to a spring 201. 'by which the shaft is oscillated in the other direction. The yoke engages a grooved hub 202 with which the .clutch member 16 is provided and the spring 201 exerts its tension to normally retract the clutch member to inoperative position. When the treadle 200 is depressed the clutch members are forced together and power is thus applied by means of the belt 17 to the pulley 18 afiixed upon the shaft 20. lVhen the treadle is relieved of downward pressure and the clutch members are vseparated by reason of the sprig 201, the driving power is discontinued and the shaft 20 would continue to revolve indefinitely by reason of momentum unless provided with means for arresting its movement. The means herein provided is adapted to permit continued rotation of the shaft 20 until such time. 'as the speed of said shaft is retarded to a predetermined degree, whereupon automatic stopping devices are brought into play for stopping the shaft at a predetermined position.

The form of mechanism herein shown for stoppingr the shaft comprises cooperative stop members of whcirone is relatively stationary and of which the other is rotatively carried by the shaft 20. 'lhe stationary stop member is shown as a shoulder 203 formed in the outer end of one of the shaft bearings 'to be longitudinally movable thereon.

21. The movable stop member see Fig. 42, is y sleeve 207 splined or otherwise secured upon theshaft 20 so as to be rotated thereby and helical spring 208 surroundsthe sleeve 207 and is compressedv between a flange 209 on the sleeveand the hub of the vpulley 18 and exerts its force to normally project the movable stop member 204 into engagement with the stationary stop member 208. The flange 209 is formed with an ear 210 which is adapted to be engaged by a retaining arm 211 formed upon a lever 212. The lever is pivotally mounted upon a stud 213 which is carried by the pulley 18 and is provided at its opposite end with a Weight 214 by which the arm 211 is moved into operative correlation with the ear *210 when the Weight is subjected to centrifugal force. The weighted endof the lever is connected to a. spring 215 carried in a casing 216 with which the pulley is provided for inclosing the several members described. The tension of the spring 215 tends tol hold the l' weight 214 toward the axis of the shaft 20 I' .as indicated by Fig.. 40. In this position thev` retaining arm 211 is retracted from the ear 210, but when the shaft and pulley are rotated at a sutlieient speed to cause the weighted lever to assume the position shown by Fig. 41, the retaining arm 211 is moved to such a position as to be adapted. to be en gaged by the ear 210 and thus retain the.

movable stop member in retracted position. For the purpose of placing the several part-s in the position shown b v Fig. 1, the machine is provided with a lever fo'r retracting the movable stop member. Said lever is indicated at 217 in Figs. 1 and 38, and is pivoted at 218 to any suitable fixture such as a portion of the head 10. (lne end of the lever is formed as a fork and is provided with knobs 219 which straddle the movable stop member and which au` adapted to abut against the outer end of the sleeve 207,. The lever is connected by a link or chain 220 with the treadle 200 by means of which it is adapted to be actuated for the purposeyof retracting thel movable stop member.

lVhen the clutch members 15 and 16 are moved into operative engagement by depressing the treadle 200, the shaft 20 is immediately set in motion and the movable 1 stop member is retracted so that the ear 210 is moved beyond the inner face of the retaining arm 211. As the speed .of the shaft 20 approaches the maximum point, the

weight of the lever 212 causes the lever to move to the position shown by F ig. 4l in which position it remains so long as the speed of the shaft is kept above a certain predetermined degree.

lVhen the treadle 200 is released, the clutch members 15 and 16 are immediately uncoupled and theV driving power is thus discontinued, but so long as the speed of the shaft 20 is in excess of said predetermined speed, the weighted lever 2 12 remains in the position shown by Figl. 41. Upon releasing the treadle 200, the spring 208 projects the movable stop member toward thel stationary member so far as to cause the ear 210 to engage the rear side ofthe retaining arm 211 at which position'the sleeve 207 and the movable stop member are held so long as the ear is engaged bythe retaining arm. When the speed of the shaft 20 becomes so slow as to be insulicient to prevail over the tension of the spring 215, the weighted lever 212 is retracted to its normal position thus disengaging the ear 210 and permitting the spring 208 to project the movable stop member against the end of the bearing 2l. The shaft 20 may then continue to revolve only so far as to cause the stop finger 204 to engage the stop shoulder 203 whereupon all movement of the shaft is arrested'. The purpose of forming the stop finger 204 on a elical spring as shown is to provide a yielding cushion rather than an absolutely rigid device /for absorbing the impact aused by engaging the stationaryvstop mem- Having thus explained the nature of my said invention and described a way of constructing and using the same, although without attempting to set forth all of the forms in which 1t may be made or all of the modes of its u se, I declare that what I claim is '1. In a lock stitch sewing machine, a segmental shuttle race having a gap to admit a loop of thread to the shuttle, a rotary shuttle having a segmental flange in coactive relation with said race and having a nose between the ends of said flange to enter the loop of thread, a shuttle-supporting member movable to and from enga-gement with the' shuttle, said shuttle having a shoulder arranged to be engaged by and disengaged from said supporting member, and means for causing said supporting member to operatively engage the shuttle while the nose of the shuttle is passing across the gap of the race.A

2. In a lock stitch sewing machine, a rotary shuttle and a shuttle race arranged so that their axes are substantially horizontal, said race having a gap at its lower side to admit a loop 'of thread, and said shuttle having a segmental race-engaging flange and agap between the ends thereof, a shuttle-sup# porting member movable to and from engagement with the shuttle, the shuttle havlng a shoulder adapted to coact with said supporting member, and means for causing said supporting member to operatively engage the shuttle While the space between `the ends of the shuttle flange registers with the gap in the race. f

3. In a lock stitch sewing machine, a rotary 'shuttle having a segmental external iange and a concentric cylindric surface of relatively small diameter, a segmental shuttle racefor supporting the shuttle by the flange thereof, said race having a gap to peripheral gap and a shoulder within themarginal portion, a shuttle race formed with a gap, acontinuously revolving driver for f the shuttle, and a member pivotally connect ed to and supported by the driver for engaging said shoulder to confine the shuttle centrally within the race, said member being retractible to permit the passing'of a loop of thread between it and the shuttle.

- 5. In a machine of the character described, a revoluble shuttle having an end wall formed with an aperture, a segmental shuttle race supporting the shuttle by its periphery, the shuttle havin periphery, a rotary driver or the shuttle, a member pivotally mounted upon and movable with the driver for engaging the wall of said aperture, and means for,v moving said member into and out of said aperture.

6. In a Amachine of the character described, a revoluble shuttle having an end wall formed with an aperture, a shuttle race, a rotary driver for the shuttle, a member pivotally mounted upon the driver for engaging the wall of said aperture to support the shuttle, and means for oscillatingl said member into and out of said aperture.

7. In a lock-stitch sewing-machine, a circular shuttle race havin a gap for the re- 'zeption and discharge o the loop of needle thread, a rotating shuttle having a looppulling nose, the body of the-shuttle having a segmental guiding iian'ge and said nose having a segmental guidin'J flange, a shuttlesupporting member movab e to and from engagement With the shuttle, the shuttle Vhaving a surface for engaging sa'd supporting' member, and means for actuating sald supporting member so as to cause it to operatively engage theshuttle continuously from the time the rear end of the shuttle ange enters said gap in the race until said nose h recess in its i flange has .crossed the gap and again engaged the race, said actuating means being adapted to retract said supporting member from the shuttle to enable the loop of needle thread to pass. l

8. In a machine of the character described, a rotatable shuttle, a shuttle race having a gap for the reception and discharge of the loop of needle thread, a shuttle driver, a shuttle-supporting member movable to and from engagement with the shuttle, and means Within the shuttle race for moving said supportingvmember to and from engagement With the shuttle.

9; In a machine of the character described, a rotatable shutt1e,a shuttle race havmg a gap for the reception and discharge of the loop of needle thread, a shuttle d iver, a shuttle-supporting member carried rotativflly by said driver, said supporting member being movable to and from engagement with the shuttle, and means in the shuttle race for moving said supporting member to and from engagement with the shuttle.

In testimony whereof I have affixed my signature, in presence of two witnesses.

HARRIE A. BALLARD. Witnesses:

W. P. ABELL, P. W. PEzzE'rTI.

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