US1208950A - Buttonhole-sewing machine. - Google Patents

Buttonhole-sewing machine. Download PDF

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Publication number
US1208950A
US1208950A US68412512A US1912684125A US1208950A US 1208950 A US1208950 A US 1208950A US 68412512 A US68412512 A US 68412512A US 1912684125 A US1912684125 A US 1912684125A US 1208950 A US1208950 A US 1208950A
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clamp
arm
lever
work
stitch
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US68412512A
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James G Greene
Louis F A Buechner
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Singer Co
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Singer Co
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B73/00—Casings
    • D05B73/04—Lower casings
    • D05B73/12—Slides; Needle plates

Definitions

  • JAMES G. GREENE AN D LOUIS F.
  • This invention relates to an improvement in buttonhole stitching machines, and isvdirected particularly to novel features of the Work-holder and means for operating the same.
  • the Work-clamping members may be successively closed upon the work and s read for a stitching operation and therea ter opened to release the Work, and to provide clamp-operating means acting independently of the actuating means for ther stitch-forming and 'cutting mechanisms, invorder that the timing of the several groups of mechanism may be arranged .each independently of the others so as to reduce to a minimum the time required in performing a complete cycle of the entire machine.
  • ⁇ It has for a further object to provide a simple and effective construction for the wor r-holder whereby the actuation of a single element thereof will accomplish the closing and opening of the clamping jaws and the spreading and drawing together of the separable pairs thereof.
  • the machine is constructed with rotary stitchforming mechanism and work-feeding mechanism including a dwell-producing member so connected with the stitch-for1ning mechanism as to produce a semi-rotation thereof while thel longitudinal feed of the work is arrested for stitching an end of the buttonhole.
  • the .work-holder derives its longitudinal feeding movements from a connection with 'the feeding mechanism, and comprises pairs of separable clamping jaws movable laterally toward and from each other and ada ted to be drawn together into clamping rei) tion by means of a toggle connection with an tion with a slide-'plate suitably constructed and connected with the laterally movable clamping jaws to cause them to be separated and drawn together by the clam -jaw closlng and opening movements ofp the rockshaft.
  • the stitchforming and feeding mechanisms are adapted to be connected for operation by one driv- 1ng element while two independent trains of mechanism are adapted for operative connection with another driving element for eliectlng the operation of a slit-cutting mechanism and the clamp-opening and closlng device, the former being actuated once and the latter twice in each complete cycle of the machine.
  • anism includes arock-lever having a permanent connection with the operating rockshaft of the traveling work-holder, which is an important feature of the construction, especially with different adjustments of feed-traverse to which the clamp-operating mechanism adjusts itself without any chan consequent upon the adjustment of the fee ing mechanism.
  • FIG. 1 is a front side elevation of a buttonhole stitching and cutting machine em ⁇ bodying the same and containing stitchforming, feeding and slit-cutting mechanisms constructed in substantial accordance with our applications Serial N o. 576,639, filed Aug. 11,'1910, and Serial No. 597,113, filedDec. 13, 1910; and
  • Fig. 2 is a plan of the same with the frame in section above the work-plate.
  • Fig. 3 is a rear side elevation of the machine and Fig. 4 a bottom plan of a. portion thereof showing the clampoperating mechanism from the under side.
  • Fig. 1 is a front side elevation of a buttonhole stitching and cutting machine em ⁇ bodying the same and containing stitchforming, feeding and slit-cutting mechanisms constructed in substantial accordance with our applications Serial N o. 576,639, filed Aug. 11,'1910, and Serial No. 597,113, filedDec. 13, 1910;
  • Fig. 2 is a plan of the same with the
  • FIG. 5 is a perspective view of a portion of the worm-Wheel coupling and uncoupling device and Fig. 6 a similar view of one of th'e elements thereof.
  • Fig. 7 is a perspective view of the means for turning the stitch-forming mechanismbackward through a semi-rotation into initial position after a stitching operation.
  • Fig. 8 is a front elevation showing the feeding mechanism and controlling device in different positions from those represented in Fig. 1.
  • Fig. 9 is a perspective view of the work-clamp'with one pair of the clamping jaws and certain other parts omitted to expose, constructive features.
  • Fig. 10 a perspective view of the under side of the lower clamping jawplates.
  • Fig. 11 is an edge view of the clamp slide-plate and the lower clamping-jawplates applied thereto.
  • Fig. 12 is an elevation, partly in section, representing the driving shaft with the clutch mechanism applied thereto.
  • the machine is constructed with a frame comprising the bed-plate 1 from which rises the lower base member 2 supporting the fixed work-plate 3 and the standard 4 with overhanging arm 5 constituting the upper frame member which latter, with the standard 4, is strengthend by the rib 6.
  • the arm 5 carries the upper and-'lower bearing bosses 7 and 8 for the rotary bushings in which is journaled the reciprocating' needle-bar 9 carrying the needle 10 which cooperates in the production of overseam stitches with looper mechanism 11 carried by the rotary bushing 12 journaled in the bearing boss 13 of the base member 2.
  • the needle-bar receives its reciprocatory movements through a link connection 14 withthe vforward end of a rock-lever 15 fulcrumed at 16 upon the arm 5 and having its rearward end connected by means of the pitman 17 with a crankpin 1S carried by a pinion 19 driven by a gear 20 fixed upon t e transverse main or driving shaft 21.
  • the Iooper mechanism derives its operative movements from a connecton with the lateral arm 22 of an anglelever fulcrumed at 23 upon the base member 2 and having an upright arm 24 deriving vibratory movements from a connection with the main-shaft.
  • the needle receives its overseaming or lateral jogging movements from a rock-lever 25 fulcrumed upon the arm 5 and also deriving its rocking movements from a connection with the drivin r shaft.
  • Ihe segmental feed-pawl carrying plate 26 is mounted upon a vibrating lever 27 which is fulcrumed upon a stud 28 vsustained by the vstandard 4 and is provided 'with a forked arm 29 embracing a slideblock 3() fitted upon the actuating eccentric 31 of the main-shaft 21 which thus imparts operative jogging movements to the plate 26.
  • This feed-pawl carrying plate has pivotally mounted thereon the spring-pressed luralarmed pawls 32, S33-and 34 ada ted or operative engagement respective y with the peripheral teeth of the ratchet-wheels 35, 36 y and 37, the ratchet-wheels 35 and 36 being connected for simultaneous rotation by means of the intermeshing gear-wheels 38 'and 39, while the ratchet-wheelv 37, as remechanism, exercises the functionof a dwe l-producing member without eiiect imparting longitudinal -feeding movements to the work.v
  • the feed-pinion 40 meshing with the sliding rack 41 which carries the upwardly projecting plate 42 operatively connected by means of the sectional link-bar 43 with a lug- 44 at the rearward end of the work-holder slideplatc 45 adapted for longitudinal and transverse sliding movements upon the workplate 3 for imparting to the work traveling movements to spaceithe stitrhes.
  • a series of spring-pressed detent-levers 46, 47 and .48 is pivotally mounted upon the jogging pawl-cariying plaie 26 each adjacent one of said pawls, and is formed with a notched -extremit' adapted for engage.- ment with an arm o said pawl.
  • a series of pand-lifting levers 4! 50 and 51 is also mounted upon the pawi-carrying plate, each adjacent its respective pawl.
  • the rocking of the pawl-lifter 49 acts through the connecting rod 53 to retract the dctent-lever 48 to permit the pawl 34 to assume operative relation with the ratchetwheel 37 which continues during the stitching of the end of the bu-ttonhole, at the eompletion of which the engagement of the ,tripping lug .'34, moving with the ratchetwheel 37, with a lateral arm of the pawllifter 51 causes the extremity of the paw]- lifting arm to engage a lateral arm of the paw] 34- to retract the same to inoperative position, and sinuiltaneously 4the engagement of a pin 55 carried by said pawl-lifter with the inturned extremity of the pushrod 56 connected with ⁇ the ⁇ deteut-lever 47 causes the retraction of the lattcr'to permit the operative engagement of the pawl with the reverse-feed ratchet-wheel 36, whereby the work-holder is moved-in the opposite direction for the Switching
  • the gear-Wheel 39 carries the adjustably mounted tri ping stud ⁇ 57 which operates through mechanism tobe hereafter described in arresting the rotation of the main-shaft to interrupt the stitching and feeding actions.
  • tripping stud mossen 57 is clamped within the walls of an annular groove formed in said gear-wheel 39and is adapted to be adjusted therein after release of the clamping means, which may be of an suitable form. It will be seen that the osltion of tripping stud 57 on gear-whee 39, with respect to lever 262, will determine the length of traverse of the work-clamp.
  • The. detentlever 46 is shown provided with an upwardly extendingr arm 58'carrying a tilting contact-plate 59 pivoted thereto by means of the stud-screw 60 and normally maintained in inclined position, as represented in Figs. 1 and 8, by means of the spring 61.
  • the work-holder slide-plate 45 is formed with the usual central longitudinal slot 63 embracing the needle-throat 64 containing the needle-aperture 65and gimp-hole 66'.
  • a U-shaped recess 67 in which is Htted for longitudinal movement the correspondvingly shaped spreader slide-plate 68, the parallel branches of which are provided upon the upper faces with convergent guide-lips 69.
  • two clamp-plates 70 Mounted upon the slide-plate 45 and overlapping the spreader slide-plate 68 are two clamp-plates 70 with their adjacent edges shaped ⁇ to con form with the slot 63 and provided also with complemental clearance recesses 71, and provided also on their lower faces with convergent grooves 72 fitted to the ribs 69 of the slide-plate 68.
  • bearing blocks,74 l provided with alined bearing apertures 275 to receive the operating countersthe rearward end of -95 secured by means edges 97 of the plates crank-shaft 76 provided with the crank 77, the blocks 74. having rearward extensions 78 with bearing apertures 79 to receive the fulcrum-pins 8O of the clamp-arm sustaining blocks 81 to which are secured by means of fastening screws 82 the spring clamp-arms 83 having connected to their outer ends by means of the pivotal pins 84 the spaced lugs 85 of the tilting clamping feet 86 affording the upperl jaws of a lower jaws 87 are afforded by the upper faces of the clamp-plates 70.
  • the clamparms 83 are embraced intermediate their ends by the forked opposite extremities 88 of a pin 89 which is journaled inthe upper end of a split link 90 whose opposite end embraces the pin connecting the crank-arms 77 ofthe rock-shaft 76.
  • the turning of the rock-shaft 76 forwardly, as viewed in Fig. 9, serves to draw-the pin 89 downwardly to depress the clamlp-arms 83 and close the clamp pin before engagement with the spreaderi plate extension which latter partakes therefore of a portion only of the entire lateral motion of the link.
  • bearing blocks 74 aire provided in their .rearward sideswith guideways entered by lateral tongues 94 of the guide-bars of the screws 96 to the the undercut forward 70 are fittedto'the similarly shaped rearward edges of guideblocks.98 secured by upon the slide-plate 45 I extremities of the ,recess 67. 4By these slide-plate 45; and
  • an extension-plate 100 hose rearward extremity overlaps' the forward end of the slot 03 and is' provided with a gi
  • the ginip is thus led parallel with lthe direction of feed and is suitably located to receive the initial overseam stitches of the edge-covering seam.
  • the 1atcl1et-wlleel 37 is fixed upon the forward end of the transverse shaft 104 and has rigidly connected therewith the toothed sector 105 meshing with but having a diameter double that of the. bevel pinion 106 mounted upon the upright shaft 107 provided at .the upper and lower ends with the pinions 108 and 109 engaging the teeth at the rearward ends of the rack-bars 110 and 111 provided with teeth at their forward ends in mesh with the pinions 112 and 113 fixed respectively to the upper needle-bar bushing and the rotary looper-carrier. At its other end, and upon the rearward side of.
  • the shaft 104 has secured thereon a collar 114 provided upon one side with a radially and forwardly projecting finger 115 and upon the other side with a substantially radial Cam-arm 116.
  • the period of engagement of the pawl 34 with the ratchet-wheel 37 is such that the sector 105 with its supporting shaft 104 is given a quarter-turn while the upright shaft 107 receives a half-turn, thereby impartin to the upper and lower elements of the stitch,- Vfornnng mechanism a semi-rotation intermediate the forward and backward feeding movements of the work-holder for stitching around the eye of the buttonhole.
  • the rearward end of the clamp-arm actuating shaft 76 has fixed thereon the collar 117 provided with a fork 118 in which is pivotally mounted by means of the screws 119 the block 120 embraced by and pivotally connected by screws 121 with the fork 122 of a sleeve 123 longitudinally slotted to re l eeive a feather 1.24 secured therein by means of the transverse pins 1,25, as represented in Fig.
  • the feather 124 enters a keyway 126 of a shaft 127 slidingly fitted within the sleeve 123 and carryinv a fork 128 pivotally connected by means of screws 129 with the block 130 embraced by and pvoted by means of screws 131i* ⁇ within the fork 132 'of the rock-shaft 133 journaled within 4and sustained by a bearing bracket 134 whose foot n forwardly extending arm 140 of the clampoperating roelclever sustained by the ful-- cram-screw 141 and provided with a ri id rearwardly extending and inwardly of set arm 142 terminating in a nose 143 and carrying a lateral pin 144.
  • This rock-lever is provided with an apertured lug 142 adjacent its hub and embraced by' the forked rearward extremity 145 of a laterally swinging arm 146 pivoted to said lug by means of the transverse pin 147.
  • the swinging arm 146 is normally maintained yieldingly in substantial alinemeut with the rigid. arm 140 by means of a fiat spring 148 secured thereto by means of a screw 149 with one end resting' upon itself and the other upon the lug 142, a stop being afforded by the end of the fork in the end portion 145 or by engagement of the latter with the point of a stop-screw 150 tapped into the rigid arm 142.
  • a fulcrumstud 151 upon which is mounted the hub 152 of a swinging locking lever 153 carrying the contact-plate 153X adjacent one edge which is formed with spaced locking" notches 154 and 155 to receive the pin 144 .of the rocklever arm 142, and provided at its lower end with an apertured boss 156 to which is pivotally connected by means of the pin 157 the offset extremity 158 of aswinging arm 159 carrying a contact-block 160 adjacent the inturned extremity 146* of the swinging leverarm 146.
  • the locking arm 153 carries a stud-screw 161 embraced by one end of la spring 162 whose opposite end is attached to a plate 163 secured to a stud '164 projecting fromthe standard 4, whereby the i locking arm is maintained yieldingly in operative relation with the pin 144.
  • To the free end of the swingingarm 159 is secured the foot 165 of a bent rod 166 adapted for ehgagementlby a rod 167 rigidly secured to and depending from the swinging rock-lever arm 146.
  • the lever 153 has, secured thereto a straight wire spring 168 which rests against an ear 158K of the member 158 to press the arm 159 inwardly2 whereby its rod 166 is maintained'in yieldlng contact with f the rod V167 carried 4by the swinging rock lever-arm 146.
  • a counterfshaft 170 Suitably mounted in a bearing bracket 169 beneath the bed-plate 1 is a counterfshaft 170 .provided 'with a grooved pulley 171 embraced by a belt 172 from' the source o. powen
  • the shaft 170 carries a bevel pinion 173 meshing with a, similar pinion 174 fixed and the pivotally mounted tappet 198 upon the upright worm-shaft 175 journaled formed with a yoke 199 embracing said hub meshing with the peripheral teeth of a 198 and the bottom of a soclret formed in the 7a the frame. position'wherein a stop-arm 199x forming As represented more particularly in Fig.
  • the slide-block 181 has a lateral lug ⁇ 186 in substantial register with the inner end of whose outer wedge-shaped extremity is northe'linger 115 in the initial position of the 90 mally .engaged by the cammed end 187 0f stitch-orming mechanism prior to the the laterally extending controlling lever 188 Stitching of the eye 0f the buttonhole.
  • the tappet 198 endrawn downwardly so as to rest upon the gages one side of the finger 115 in the dotted top of the lower Wormshaft bearing 176 by line position thereof represented in Fig. 7, 95 means of the spring 190.
  • Projecting upanA carries it around into the :full line posi- Wardly from a lug 191 upon the b tion of said figure at which point the insprlng detent-arm 192 whose enlarged upper clined operative face 205 of the tripping end is provided in one' edge with a notch 193 lug deflects the tappet inwardly in opposinominally embracing the lug 1860f the yieldtion to its spring 201 and thereby disengages 100 retracted position, when engaged by the heel POSIOII during the remainder 0f the rotaof the cammed extremity 187 of the levertion, and' by the quarter-turn of the shaft arm 188.
  • a second lifting of the cam-lever 188 causes a final rotation of the gears 194 and 196, during which the tappet 198 incidentally shifts the locking lever 153 but passes without engaging the nose 143 of the lever-arm 142 in its lower position ⁇ but it engages the finger 115 and carries it around until disengaged therefrom by the tripping lug 204 as before, described.
  • the main-shaft 21 has loosely mounted upon its rearward end the peripherally grooved pulley-wheel 207 formed in its inner face with a cavity provided with a conical rim 208 to afford a clutch-member adapt ed to be pressed into operative frictional engagement with the conical rim of a clutch member 209 having its hub 210 fixed upon the main-shaft.
  • the peripheral groove of the pulley-wheel 207 is adapted to receive the driving belt 211 extending from a. double-grooved pulley 212 upon a counter-shaft 213 mounted in bearings 214 depending from the bed-plate and driven by a, belt 215 from the source of power.
  • the pulley-wheel 207 has in its outer face a Athrust plate 216 provided with a convex central portion and secured thereto by means of fastening screws 217.
  • This thrustplate is normally pressed outwardly for disengagement of the clutch-members 208 and 209 by means of a plug 218 fitted within an axial socket of the shaft 21 with a spring 219 interposed between the inner end of said plu and 4the bottom of the socket.
  • 'lghe thrust-plate 216 is adapted to be engaged by the inclined adjacent faceof a wedge-piece 220 secured tothe clutch-lever 221 fixed upon the rearward end of a transverse rocl -shaft and carrying upon its outer end the pivotally mounted nose-piece formed with the angularly disposed arms 223 and 224 pivotally mounted upon said lever at their intersection by means of the pin 225.
  • the arm 223 is sustained in normal position by engagement of the stop-lug 226 of the nose-piece with the edge of the lever 221, and the outer end of the same lies in the path of movement Aof the tappet 197 at the beginning of a-cycle of the machine, and as represented in full lines in Fig. 3. ln the initial rotation of the gearing 194 196, the tappet 197 acts upon the tripping piece immediately after the closing of the clamp and forces the clutch-lever 221 forwardly to couple the main-shaft with its constantly running driving clement 207.
  • a hand-wheel 227 Fixed upon the forward end of the mainshaft 21 is a hand-wheel 227 having a hub portion which constitutes one of two spaced thrust members of which the other is a fixed disk
  • a pair of collars shown as circular plates or disks 230 and 231 having upon their adjacent faces respectively the wedge-shaped projections or teeth 232 and 233 adapted for -wedge-like engagement, when said disks are relatively turned, to force them apart into frictional engagement with the adjacent thrust members or interposed washers 234 and 235.
  • the disk 230 is provided with a forked lug 236 embracing the forward end of the rock-shaft by means ofA which it is rev strained against rotation with the mainshaft.
  • the other disk 231 has a lateral arm 237 upon which is fnlcrumed by means of the screw 238 the elbow-lever 239 formed with a lateral arm carrying a wearing block 240.
  • the wearing block is adapted to rest upon the eccentric periphery of a cam-ring 241 secured upon the hub of the disk 229.
  • a depending arm of the elbow-lever 239 carries a stud 242 which enters a curved slot 243 in the cam-lever 244 fulcrumed ⁇ by means of the stud-screw 245 upon the post 246 rising from the bed-plate 1.
  • the cam-lever 244 is connected by means of the screwbolt 247 with the lower end of a link 248 whose upper end is attached by means of 'the screw-stud 249 to the forwardly projecting crank-arm 250 fixed upon the rock-shaft 222.
  • the link 248 is normally drawn downwardly by a spring 251 to normally seat a stop-arm 252 thereof upon the'flattened upper end of the standard 246.
  • the rock-shaft 222 has also fixed thereon the rearwardly extending forked arm 253 provided with the short branch 254 and the 'longer branch 255 carrying the feed-tripping rod 62 before mentioned.
  • the branch 254 is adapted for engagement by the operative shoulder of the an lar latch-lever 256 mounted upon the fixeufulcrum-screw 257 and having a rearwardly extending tail 258, such lever being pressed into operative en gagement with the member 254 by means of a spring 259 coiled around its fulcrumstud 257.
  • the member 254 of the arm 253 is also adapted for engagement by the hooked outer end of the upwardly extending arm 260 of an angular locking lever fulcrumed upon the stud 261 and having a tripping arm 262 whose inturned extremity lies in the path of movement of the tripping stud 57 carried by the gear-wheel 39.
  • tripping lever 260 262 is provided with the usual spring for throwing it into operative engagement with the member 254 of the arm 253. s
  • the cam-lever 188 carries a stud 263 embraced by the lower end of anA upright rod 264 whose apertured opposite end embraces.
  • the rod 264 carries a roller-stud 269 adapted for engagement by the camfinger 270 fixed upon the rockingipin 271 which is journaled in the standard 4 and has fixed upon its opposite end a depending arm 272 with its lower extremity bent forwardly into an extension 273 formed intermediate the ends with ia shoulder 274.
  • the arm 272 is normally pressed back# wardly into retracted position by-meanso a spring 275 secured thereon and having an arm resting upon the hub of the latch-lever 256.
  • the described movement of the arm throws the trippin rod 62 into engagement with the contact-p ate 59, whereby the detent-lever 46 is disengaged from the initial feed-pawl 32 and the feeding mechanism is thrown into action simultaneously with the starting of the main-shaft.
  • the recession of the tripping stud 57 from the locking leverarm 262 permits the locking arm 260 to engage the extremity 254L of the rock-shaft arm 253 to retain the same in rimning position after the disengagement therefrom of the latch-lever 256 by the action of the stud 52 upon the ear-wheel'38.
  • rockesliaft arni is depressed 1n startingA corresponding movement ot the camlover il which rocks the willow-lever 22:39 to bring the contact-Mock 'Jiu into forcible engagement with the periphery of the cani-ring 241 hy means of which the pressure disk Q31 is tnrncd to engage its teeth with those of the dish 23() wherehy fric-tion is applied to tho thrustanclnhers 228 and )2H to arrest the shaft 2i.
  • the slit-cuttingy mechanism comprises the rocklevcr LH carr ⁇ 'iuflr an upper rutter-nn-niher LHi' and sustained hy a rock-shaft 28S coneentrie with the fulcrunrscrcw 141 for thc clamp-operating mailt-lever,
  • the lower cutter-member is moved into and out of operative relation with the upper cutter-member for a cutting operation hy means of a connection with the rock-lever 2R53 which is itselic actuated hf a triangle device composed of linksfl@ and 290 connecte-d hy the pivF otal pin 291 which is emliraced liy' the forn ward end of a link-har 292 having' its apertnred opposite end entered hy a cranlcpin 29).
  • the lil 2500* of the armiOO is adapted to he engaged hy the. hooked extremity 2,01 of a pan'ldever 302 pivotally mounted upon au upwardly extending arm 30? ot' an angle lever' tulcrumed upon a stud 301 carried hy an ui'nvardly projecting ea r 305 oi' the rock- ⁇ shaft arm and having;r a lateral arm 30G which is connected hy n'leans of the link 30T 1V hen the the main-shaft, the anglo-lever S03 306 is carried downward bodily andlis rocked by its link connection 30T with the stationary lever-arm 260, whereby the pawldevcr 302 is caused to rest upon the lip 300 of the arm 3U() of the c1Itter-control!inar deviceJ
  • the angle-lever 303 306 is rocked so as to draw the paivl
  • One of the jointed sections of the link-har 43 is slidingly mounted within a gnideway 309 iol a rising and falling' frame 310 connected with and actuated hy the cutter rock-shaft "FSSin such'nianner that when the upper-cutter carrying arm 286 descends for a cutting action, the frame SIQ rises and retracts the 1vork-cla1np from Stitching position into cutting position from meegaan which it is returned 'oy the descent of the frame 231i) cll'ccted hy the reverse movement ot the lever Just prior to the completion of a rotation of the cutter-actuating ivornrwheel 291, the rearward end of the link-har .292 engages the inclined forward extremity 26S of thel lever 26(3 thereby lifting they rod 261 and imparting the second oinrative.
  • actuatingV means and adapted to actautoinatically and imsitively upon the clamp to open and close the same.
  • ln a ⁇ huttonhole stitching machine the combination with a work-clamp, stitchfocniing and feeding mechanisms, means including a rotaryv shaft for olierating the saine, a constimtly rotating driving element, and a clntch device including a. swinging lever ivluirebjiY said shaft may be coupled to the driving element. of dauin-actuating means with connections with the clamp whereby the latter is opened and closed, and means carried by said clamp-actuating means and adapted to move the clutch lever into starting position for setting in motion the stitch-,forming and feeding mechanisms.
  • a buttonhole stitching machine the, combination with a. Work-clamp, stitchlorming and feeding mechanisnis, means for imparting operative movements Jthereto, and means for turning the stitch-forming mechanism during the stitching of the, c ve of an c vclet-end buttonhole, of clamp-operating means timed for action both before and after a ⁇ buttonhole stitching o eration and hicluding a rotar)T element adilpted in its first actuation to close the clamp ⁇ and in its succeeding actuation to turn the stitch-forming mechanism into initial position.
  • a buttonhole stitchingr machine2 the combination with a work-clamp, stitchforming mechanism, feeding mechanism for producing the reverie' feeding movements between the stitch-forming mechanism and the walt-island), and including dwell-producing means having a connection With the stitch-forming nniehaniem whereby the latter is given senil-Mutation for the Stitching ol one enitof a buttonhole, and actuating means for the stitch-forming and feeding meehanisms, of elamp-operating means independent ol the actuating means for the stileli-lorniing and feeding mechanisms wherebyY the clamp is opened and closed respectively at the beginning and end of a butfonhole-iwnrlneing evele, and means connected with the el:mm-inicrating means for turning the stitch-forming mechanism into initial position after each stitching operation.
  • a button hole stitching machine the con'ibination 'with stitch-forming mechanism.
  • a work-clamp means for producing relative feeding movements between the stitch-forming mechanism and the workclamp ⁇ and adjusting means whereby the length of relativee traverse of the workelamp and stitch-forming mechanism may be varied.
  • work-clamp operating means mounted .f-'ei'iaratelv from the work-clamp and adapted .to close and open the latter, and a permanent connection between said nia-rating means and the work-clamp adapted to follow said feeding nmvements.
  • a work-clamp provided with relatively movable upper and lower jaws and means including a toggle ⁇ device for closing said 'aes toe'ether and maintaininor theming relative feeding movements between the stitch-forming mechanism and the Workc'lainp, of work-clamp operatingmeans, a
  • v 14 In a buttonhole stitching machine, the combination with stitch-forming mechanism, a work-clamp, and means for producing relative feeding movements between the stitch-forming mechanism and the workclamp. of work-clamp operating means, a permanent connection between said operating means and the work-clamp adapted to follow said feeding movements, means applied to an element of said clamp-operating means for normally maintaining the latter in either of its extreme positions, and controlling means for disengaging the locking means from said element both before and after a buttonhole stitching operation.
  • a button-hole stitching machine comprising pairs of separable clamping jaws movable laterally toward and from each other and formed with inclined grooves, a spreading plate provided with inclined ribs fitted within the grooves of said clamping jaws and with spaced shoulders, a clamp-operating device provided with contact fingers adapted respectively to engage the clamping jaws and the shoulders of the spreading plate, and ac- ⁇ tuating means for said clamp-operating device whereby the clamping jaws are snccessively closed upon the work and spread preparatory to the stitching operation.
  • a work-holder for buttonhole stitching ⁇ machines comprising pairs of separable clamping jaws movable laterally toward and from each other, 'a toggle device for drawing said jaws into clamping relation, a slideplate operatively connected with a member of said toggle device and provided with divergent guides each connected with one of the jaws of each pair, and means for actuating said toggle device for Opening and scemo closing said jaws and for imparting thereto relative lateral. shifting movements.
  • a work-holder for buttonhole stitching machines comprising pairs of separable clamping jaws movable laterally toward and from each other, a toggle device for drawing said jaws into clamping relation, a
  • slide-plate ⁇ provided with divergent guides each connected withone of the jaws of each pair, a loose connection between an element of said toggle device and the slide-plate whereby the latter is causedto erform its operative spreading movement a ter the toggle device has performed the clamp-jaw closing portion of its movement, and means for actuating said toggle device.
  • a buttonhole stitching machine the combination with a Work-clamp, stitchforming and feeding mechanisms, slit-cutting mechanism, and independent and successively operatin means for actuating the stitch-forming an feedin mechanisms and the cutting mechanism, o means independent of said actuating means for automatically closing the clamp, controlling means whereby the actuating means for the stitchforming and feeding mechanisms may be thrown into and out of action, and an operative connection between said controlling means and the clamp-closing means.
  • a buttonhole stitching machine the combination with a Workclamp,stitchf0rm ing and feeding mechanisms, means for imparting operative movements to the stitchforming and feeding mechanisms, and means or turning the stitch-forming mechanism duringthe stitchin of the end of a buttonhole, of clamp-closing means, clampopening means connected to and movable simultaneously with the clamp-closing means, and means controlled by the turn ing means of the stitch-forming mechanism for interrupting ⁇ -and establishing operative relation between the clamp-opening means and the clamp.
  • the combination with stitch-forming mechanism, a work-clamp, and means for producing relative feeding movements between the stitch-forming' mechanism and the workclamp, of work-clamp operating means comprising a rock-lever, a flexible connection between the ⁇ same and the work-clamp, and actuating means including tWo diierentially moving tappets adapted to act positively upon said rocklever to rock the same alternately in opposite directions.
  • the combination with stitch-forming mechanism, a work-clamp, and means for producing relative feeding movements between the stitch-forming mechanism and the workclamp of work-clamp operating means comprising a rock-lever provided with a rigid Varm and a swinging arm adapted for movement laterally transversely to its rocking movements, a connection between the rocklever and the work-clamp, actuating means including a clamp-closing and a clamp-opening' tappet with means for imparting operative movements thereto, and means for shifting the swinging rock-lever arm out of operative relation with the clamp-opening tappet during the action of the clamp-closing tappet upon the rigid rock-lever arm, and for thereafter restoring said swinging arm to operative relation with the clamp-opening tappet.
  • the combination with stitch-forming mechanism, a work-clamp, and means for producing relative feeding movements between the stitchforming mechanism and the work-clamp, of work-clamp operating means comprising a rock-lever, a connection between the same and the work-clamp, a normally operative locking device for preventing the movement of said rock-lever, a clamp-closing and a clampopening tappet adapted for action successively upon said rock-lever and upon said locking device preparatory to each engagement with the rock-lever, meansfor imparting operative movements to said tappets,
  • a work-clamp and means for producing relative feeding movements between the stitchforming mechanism and the work-clamp, of work-clamp operating means comprising a rock-lever provided with a rigid arm and a. swinging arm adapted for movement laterally transversely to its rocking movements, a connection between the rock-lever and the work-clamp, a vnormally operative locking element provided with a rigid shoulder and a laterally yielding shoulder movable transversely of the direction of rocking movement of the rock-lever, a clamp-closing tappet' adapted for successive engagement with the rigid shoulder of the locking element and the rigid arm of the rock-lever for unlocking and shifting the rock-lever to close the clamp, a clamp-opening tappet adapted for successive engagement with the yielding shoulder of the locking element and the laterally swinging arm of the rock-lever for unlocking and shifting the rock-lever to open the clamp, means for actuatin said tappets, and means for preventingt e effective o eration of the clamp

Description

1. s. GREENE al L. F. A.V BU'CHNER. BUTTGNHOLE SEWING MACHINE.
1,208,950. ^PP"'c^TUN FILED 53.16. |912.
Patented Dec. 19, 1916.
3 SHEETS-SHEET 2.
1.6.GREENE E L. E. A. BCHNER.
BUTTONHOLE SEWING MACHINE.
APPLICATION FILED MAR. I6. 1912.
4Patentd ne@.19,1916.
3 SHEETS--SHEET 3.
m l Erl ATTORNEY operating rock-shaft having a loose connec- N UNITED sTATEs PATENT oEEIcE.
JAMES G. GREENE AN D LOUIS F. A. BCHNEB, 0F ELIZAJBET NEW JERSEY, ASSIGN- OBS 10 THE SINGER MANUFACTURING CGMIANY, 'A COBPQ ATION 0F NEW JERSEY.
BUTTONHOLE-SEWING MACHINE.
. Specication o1' Letters Patent.
Patellt'd'lmmg, 1916 To all 'm4/1.0ml 'it may concern:
Be it known that we, JAMES G; GREENE and Louis F. A. BGHNER, citizens of the United States, residing at Elizabeth, New Jersey, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Buttonhole-Sewing Machines, of which the following is a specification, reference being had therein to the accompanying drawings.
This invention relates to an improvement in buttonhole stitching machines, and isvdirected particularly to novel features of the Work-holder and means for operating the same. x
It has for one of its objects to provide automatically acting means lwhereby the Work-clamping members may be successively closed upon the work and s read for a stitching operation and therea ter opened to release the Work, and to provide clamp-operating means acting independently of the actuating means for ther stitch-forming and 'cutting mechanisms, invorder that the timing of the several groups of mechanism may be arranged .each independently of the others so as to reduce to a minimum the time required in performing a complete cycle of the entire machine.
`It has for a further object to provide a simple and effective construction for the wor r-holder whereby the actuation of a single element thereof will accomplish the closing and opening of the clamping jaws and the spreading and drawing together of the separable pairs thereof.
In its preferred embodiment, the machine is constructed with rotary stitchforming mechanism and work-feeding mechanism including a dwell-producing member so connected with the stitch-for1ning mechanism as to produce a semi-rotation thereof while thel longitudinal feed of the work is arrested for stitching an end of the buttonhole. The .work-holder derives its longitudinal feeding movements from a connection with 'the feeding mechanism, and comprises pairs of separable clamping jaws movable laterally toward and from each other and ada ted to be drawn together into clamping rei) tion by means of a toggle connection with an tion with a slide-'plate suitably constructed and connected with the laterally movable clamping jaws to cause them to be separated and drawn together by the clam -jaw closlng and opening movements ofp the rockshaft. t
In the present embodiment, the stitchforming and feeding mechanisms are adapted to be connected for operation by one driv- 1ng element while two independent trains of mechanism are adapted for operative connection with another driving element for eliectlng the operation of a slit-cutting mechanism and the clamp-opening and closlng device, the former being actuated once and the latter twice in each complete cycle of the machine. anism includes arock-lever having a permanent connection with the operating rockshaft of the traveling work-holder, which is an important feature of the construction, especially with different adjustments of feed-traverse to which the clamp-operating mechanism adjusts itself without any chan consequent upon the adjustment of the fee ing mechanism.
The invention will be understood by reference to the drawings annexed hereto,` in which- Figure 1 is a front side elevation of a buttonhole stitching and cutting machine em` bodying the same and containing stitchforming, feeding and slit-cutting mechanisms constructed in substantial accordance with our applications Serial N o. 576,639, filed Aug. 11,'1910, and Serial No. 597,113, filedDec. 13, 1910; and Fig. 2 is a plan of the same with the frame in section above the work-plate. Fig. 3 is a rear side elevation of the machine and Fig. 4 a bottom plan of a. portion thereof showing the clampoperating mechanism from the under side. Fig. 5 is a perspective view of a portion of the worm-Wheel coupling and uncoupling device and Fig. 6 a similar view of one of th'e elements thereof. Fig. 7 is a perspective view of the means for turning the stitch-forming mechanismbackward through a semi-rotation into initial position after a stitching operation. Fig. 8 is a front elevation showing the feeding mechanism and controlling device in different positions from those represented in Fig. 1. Fig. 9 is a perspective view of the work-clamp'with one pair of the clamping jaws and certain other parts omitted to expose, constructive features.
The clampoperating mechgarde the feedin thereof, and Fig. 10 a perspective view of the under side of the lower clamping jawplates. Fig. 11 is an edge view of the clamp slide-plate and the lower clamping-jawplates applied thereto. Fig. 12 is an elevation, partly in section, representing the driving shaft with the clutch mechanism applied thereto.
As represented in. the drawings, the machine is constructed with a frame comprising the bed-plate 1 from which rises the lower base member 2 supporting the fixed work-plate 3 and the standard 4 with overhanging arm 5 constituting the upper frame member which latter, with the standard 4, is strengthend by the rib 6. The arm 5 carries the upper and-'lower bearing bosses 7 and 8 for the rotary bushings in which is journaled the reciprocating' needle-bar 9 carrying the needle 10 which cooperates in the production of overseam stitches with looper mechanism 11 carried by the rotary bushing 12 journaled in the bearing boss 13 of the base member 2. The needle-bar receives its reciprocatory movements through a link connection 14 withthe vforward end of a rock-lever 15 fulcrumed at 16 upon the arm 5 and having its rearward end connected by means of the pitman 17 with a crankpin 1S carried by a pinion 19 driven by a gear 20 fixed upon t e transverse main or driving shaft 21. The Iooper mechanism derives its operative movements from a connecton with the lateral arm 22 of an anglelever fulcrumed at 23 upon the base member 2 and having an upright arm 24 deriving vibratory movements from a connection with the main-shaft. The needle receives its overseaming or lateral jogging movements from a rock-lever 25 fulcrumed upon the arm 5 and also deriving its rocking movements from a connection with the drivin r shaft.
Ihe segmental feed-pawl carrying plate 26 is mounted upon a vibrating lever 27 which is fulcrumed upon a stud 28 vsustained by the vstandard 4 and is provided 'with a forked arm 29 embracing a slideblock 3() fitted upon the actuating eccentric 31 of the main-shaft 21 which thus imparts operative jogging movements to the plate 26. This feed-pawl carrying plate has pivotally mounted thereon the spring-pressed luralarmed pawls 32, S33-and 34 ada ted or operative engagement respective y with the peripheral teeth of the ratchet-wheels 35, 36 y and 37, the ratchet-wheels 35 and 36 being connected for simultaneous rotation by means of the intermeshing gear-wheels 38 'and 39, while the ratchet-wheelv 37, as remechanism, exercises the functionof a dwe l-producing member without eiiect imparting longitudinal -feeding movements to the work.v
Fixed to and adapted to rotate with the ratchet-wheel 36 and gear-wheel 39 is the feed-pinion 40 meshing with the sliding rack 41 which carries the upwardly projecting plate 42 operatively connected by means of the sectional link-bar 43 with a lug- 44 at the rearward end of the work-holder slideplatc 45 adapted for longitudinal and transverse sliding movements upon the workplate 3 for imparting to the work traveling movements to spaceithe stitrhes.
A series of spring-pressed detent-levers 46, 47 and .48 is pivotally mounted upon the jogging pawl-cariying plaie 26 each adjacent one of said pawls, and is formed with a notched -extremit' adapted for engage.- ment with an arm o said pawl. A series of pand-lifting levers 4!) 50 and 51 is also mounted upon the pawi-carrying plate, each adjacent its respective pawl.
Vif'hen the machine is at rest, all of the pawls are disengaged from their respective ratchet-wheels. At the beginning of a stitching operation, the ('letcnt-pawl 46 is retracted and the pawl 32 caused to assume operative relation with the ratchet-wheel 35, thereby imparting reverse step-by-step rotary movements to the intermeshing gearwheels 33 and 39 and imparting through the pinion 40, rack 41 and sectional link-bar 43 the requisite traveling movements to the work-holder for the first side-stitching operation.. Upon the engagement of the studpin 52, carried by the gear 38, with a lateral arm of the pawl-lifting member 49, the latter. is rocked to retract the pawl 32 which is detained in inoperative position by the detent-lever 46.
The rocking of the pawl-lifter 49 acts through the connecting rod 53 to retract the dctent-lever 48 to permit the pawl 34 to assume operative relation with the ratchetwheel 37 which continues during the stitching of the end of the bu-ttonhole, at the eompletion of which the engagement of the ,tripping lug .'34, moving with the ratchetwheel 37, with a lateral arm of the pawllifter 51 causes the extremity of the paw]- lifting arm to engage a lateral arm of the paw] 34- to retract the same to inoperative position, and sinuiltaneously 4the engagement of a pin 55 carried by said pawl-lifter with the inturned extremity of the pushrod 56 connected with` the`deteut-lever 47 causes the retraction of the lattcr'to permit the operative engagement of the pawl with the reverse-feed ratchet-wheel 36, whereby the work-holder is moved-in the opposite direction for the Switching of the second side of the buttonhole.
The gear-Wheel 39 carries the adjustably mounted tri ping stud `57 which operates through mechanism tobe hereafter described in arresting the rotation of the main-shaft to interrupt the stitching and feeding actions. In the present instance tripping stud mossen 57 is clamped within the walls of an annular groove formed in said gear-wheel 39and is adapted to be adjusted therein after release of the clamping means, which may be of an suitable form. It will be seen that the osltion of tripping stud 57 on gear-whee 39, with respect to lever 262, will determine the length of traverse of the work-clamp. When stud 57 is adjusted on gear-wheel 39 to insure a greater or a less partial revolution of said wheel before said stud trips lever 262 to stop the stitching mechanism, the movement of tripping stud 52 carried by gear-wheel 38 is changed accordingly, by the increased or diminished movement of the intermeshing gear-wl'ieels, so that the succeeding forward and backward movements of 'the work-clamp are uniform. The. detentlever 46 is shown provided with an upwardly extendingr arm 58'carrying a tilting contact-plate 59 pivoted thereto by means of the stud-screw 60 and normally maintained in inclined position, as represented in Figs. 1 and 8, by means of the spring 61. The descent of a tripping rod 62 carried by an element of the stop-motion device from the position represented in Fig. 1 to that shown in Fig. 8 brings the extremity of said rod into operative engagement with the contactplate and thrusts the same backwardly so as to disengage the datent-lever 46 from the feed-pawl 32 to set the feeding mechanism Vin` action at the beginning of a buttonhole While the contactplate is so mounted, in a manner well known, as to maintain a rigid relation with the supporting arm 58 during the descent of the rod 62, the upward movement of the latter following the tripping of the stop-motion serves to merely tilt the contact-plate out of its own path of movement without rocking the pawl-detainer to prematurely release the initial feed-pawl.
The work-holder slide-plate 45 is formed with the usual central longitudinal slot 63 embracing the needle-throat 64 containing the needle-aperture 65and gimp-hole 66'. Around the enlarged end portion of Vthis slot is a U-shaped recess 67 in which is Htted for longitudinal movement the correspondvingly shaped spreader slide-plate 68, the parallel branches of which are provided upon the upper faces with convergent guide-lips 69. Mounted upon the slide-plate 45 and overlapping the spreader slide-plate 68 are two clamp-plates 70 with their adjacent edges shaped `to con form with the slot 63 and provided also with complemental clearance recesses 71, and provided also on their lower faces with convergent grooves 72 fitted to the ribs 69 of the slide-plate 68.
Secured t@ the plates 70 by meansfof screws entering apertures 73 therein, are the stitching operation.
bearing blocks,74 lprovided with alined bearing apertures 275 to receive the operating countersthe rearward end of -95 secured by means edges 97 of the plates crank-shaft 76 provided with the crank 77, the blocks 74. having rearward extensions 78 with bearing apertures 79 to receive the fulcrum-pins 8O of the clamp-arm sustaining blocks 81 to which are secured by means of fastening screws 82 the spring clamp-arms 83 having connected to their outer ends by means of the pivotal pins 84 the spaced lugs 85 of the tilting clamping feet 86 affording the upperl jaws of a lower jaws 87 are afforded by the upper faces of the clamp-plates 70. The clamparms 83 are embraced intermediate their ends by the forked opposite extremities 88 of a pin 89 which is journaled inthe upper end of a split link 90 whose opposite end embraces the pin connecting the crank-arms 77 ofthe rock-shaft 76. The turning of the rock-shaft 76 forwardly, as viewed in Fig. 9, serves to draw-the pin 89 downwardly to depress the clamlp-arms 83 and close the clamp pin before engagement with the spreaderi plate extension which latter partakes therefore of a portion only of the entire lateral motion of the link.
As will-be observed, the turning of the rock-shaft 76, whose crank is at the side thereof when the clamp'is opened, as represented in Fig. 9, causes lthe immediate depression of the clamp-arms during the initial descent of the crank-pin which is nearly completed before the linger 93 enthe aperture 92 when the s reader-plate 68 is drawn backwnrdly andj the two clamp-plates `70 forced apart by engagement of the convergent guide-ribs 69 with the clamp-platre grooves 72 entered thereby. As the pruts are constructed yund arranged to allow the cranks 77 to pass beneath the rock-shaft 76,
thus straightened, affords The bearing blocks 74 ,aire provided in their .rearward sideswith guideways entered by lateral tongues 94 of the guide-bars of the screws 96 to the the undercut forward 70 are fittedto'the similarly shaped rearward edges of guideblocks.98 secured by upon the slide-plate 45 I extremities of the ,recess 67. 4By these slide-plate 45; and
fabric clamp whose Y means, the clamp-plates 70 are sustained upon the slide-plate 45 for movement toward and from each other under the action of the spreinler-plate 68.
Secured upon the forward portion of the slide-plate 45 is an extension-plate 100 hose rearward extremity overlaps' the forward end of the slot 03 and is' provided with a gi|np-holdingspur .10| beneath which the gimp f; is adapted to be drawn from the gimp-hole 66 of the nelalle-throat and thence laterally to the. edge of the worlf-j'ilate and beneath theholding nipper-spring 102 cured in position by the screw 103. In starting a buttonhole. stitching operation, the ginip is thus led parallel with lthe direction of feed and is suitably located to receive the initial overseam stitches of the edge-covering seam.
The 1atcl1et-wlleel 37 is fixed upon the forward end of the transverse shaft 104 and has rigidly connected therewith the toothed sector 105 meshing with but having a diameter double that of the. bevel pinion 106 mounted upon the upright shaft 107 provided at .the upper and lower ends with the pinions 108 and 109 engaging the teeth at the rearward ends of the rack-bars 110 and 111 provided with teeth at their forward ends in mesh with the pinions 112 and 113 fixed respectively to the upper needle-bar bushing and the rotary looper-carrier. At its other end, and upon the rearward side of. the standard 4, the shaft 104 has secured thereon a collar 114 provided upon one side with a radially and forwardly projecting finger 115 and upon the other side with a substantially radial Cam-arm 116. The period of engagement of the pawl 34 with the ratchet-wheel 37 is such that the sector 105 with its supporting shaft 104 is given a quarter-turn while the upright shaft 107 receives a half-turn, thereby impartin to the upper and lower elements of the stitch,- Vfornnng mechanism a semi-rotation intermediate the forward and backward feeding movements of the work-holder for stitching around the eye of the buttonhole.
The rearward end of the clamp-arm actuating shaft 76 has fixed thereon the collar 117 provided with a fork 118 in which is pivotally mounted by means of the screws 119 the block 120 embraced by and pivotally connected by screws 121 with the fork 122 of a sleeve 123 longitudinally slotted to re l eeive a feather 1.24 secured therein by means of the transverse pins 1,25, as represented in Fig. 91 The feather 124 enters a keyway 126 of a shaft 127 slidingly fitted within the sleeve 123 and carryinv a fork 128 pivotally connected by means of screws 129 with the block 130 embraced by and pvoted by means of screws 131i* `within the fork 132 'of the rock-shaft 133 journaled within 4and sustained by a bearing bracket 134 whose foot n forwardly extending arm 140 of the clampoperating roelclever sustained by the ful-- cram-screw 141 and provided with a ri id rearwardly extending and inwardly of set arm 142 terminating in a nose 143 and carrying a lateral pin 144. This rock-lever is provided with an apertured lug 142 adjacent its hub and embraced by' the forked rearward extremity 145 of a laterally swinging arm 146 pivoted to said lug by means of the transverse pin 147. The swinging arm 146 is normally maintained yieldingly in substantial alinemeut with the rigid. arm 140 by means of a fiat spring 148 secured thereto by means of a screw 149 with one end resting' upon itself and the other upon the lug 142, a stop being afforded by the end of the fork in the end portion 145 or by engagement of the latter with the point of a stop-screw 150 tapped into the rigid arm 142.
Sustained by the standard 4 is a fulcrumstud 151. upon which is mounted the hub 152 of a swinging locking lever 153 carrying the contact-plate 153X adjacent one edge which is formed with spaced locking" notches 154 and 155 to receive the pin 144 .of the rocklever arm 142, and provided at its lower end with an apertured boss 156 to which is pivotally connected by means of the pin 157 the offset extremity 158 of aswinging arm 159 carrying a contact-block 160 adjacent the inturned extremity 146* of the swinging leverarm 146.
As represented in Fig. 4, the locking arm 153 carries a stud-screw 161 embraced by one end of la spring 162 whose opposite end is attached to a plate 163 secured to a stud '164 projecting fromthe standard 4, whereby the i locking arm is maintained yieldingly in operative relation with the pin 144. To the free end of the swingingarm 159 is secured the foot 165 of a bent rod 166 adapted for ehgagementlby a rod 167 rigidly secured to and depending from the swinging rock-lever arm 146. The lever 153 has, secured thereto a straight wire spring 168 which rests against an ear 158K of the member 158 to press the arm 159 inwardly2 whereby its rod 166 is maintained'in yieldlng contact with f the rod V167 carried 4by the swinging rock lever-arm 146.
Suitably mounted in a bearing bracket 169 beneath the bed-plate 1 is a counterfshaft 170 .provided 'with a grooved pulley 171 embraced by a belt 172 from' the source o. powen The shaft 170 carries a bevel pinion 173 meshing with a, similar pinion 174 fixed and the pivotally mounted tappet 198 upon the upright worm-shaft 175 journaled formed with a yoke 199 embracing said hub meshing with the peripheral teeth of a 198 and the bottom of a soclret formed in the 7a the frame. position'wherein a stop-arm 199x forming As represented more particularly in Fig. an extension of one member of the yoke 199 5, t e worm-wheel 178 is cui; out in one side rests in contact with the face of the gear 196, 75 to form a radial recess for reception of the and in which position relative to the sustainslide-block 180 formed in one end with the ing gear 196 the said tappet moves i'n a path complementa] Worm-teeth 181 and at the in which are normally located the contactother end with a hollow boss 182 'slidingly block' 153c of the locking lcver 153, the nose tted within a radial socket of the .worm- 143 of the rigid rock-lever-'arm 142 and the `80 wheel and provided with the spring 183'nor` end of the finger 115 upon the fixed collar mally pressing 'said block outwardly into 114.
Upon the channeled outer end of the stud wheel teeth, its range of movement being 164 is secured by means of the screw 202 limited by the stop-screw 184 extending the shank 203 of a tripping lug 204 having 85 through the side of the worm-wheel into a an inclined operative face 205 arranged in longitudinal slot 185 in the boss 182 Whose the normal path of circular movement of ends it is adapted to engage. the tappet 198 and with its inner extremity The slide-block 181 has a lateral lug `186 in substantial register with the inner end of whose outer wedge-shaped extremity is northe'linger 115 in the initial position of the 90 mally .engaged by the cammed end 187 0f stitch-orming mechanism prior to the the laterally extending controlling lever 188 Stitching of the eye 0f the buttonhole. In fulcrurned upon the stud-screw 189 and performing a rotation, the tappet 198 endrawn downwardly so as to rest upon the gages one side of the finger 115 in the dotted top of the lower Wormshaft bearing 176 by line position thereof represented in Fig. 7, 95 means of the spring 190. Projecting upanA carries it around into the :full line posi- Wardly from a lug 191 upon the b tion of said figure at which point the insprlng detent-arm 192 whose enlarged upper clined operative face 205 of the tripping end is provided in one' edge with a notch 193 lug deflects the tappet inwardly in opposinominally embracing the lug 1860f the yieldtion to its spring 201 and thereby disengages 100 retracted position, when engaged by the heel POSIOII during the remainder 0f the rotaof the cammed extremity 187 of the levertion, and' by the quarter-turn of the shaft arm 188. By-the lifting of the lever-arm 104 thus eected, the stitch-forming mecht the lug 186 is released and the worm-wheel anism is given a retrograde half-turn fol- 105 section pressed by its spring 183 into operlowing a semi-rotation for an eye-stitching ative relation with the worm 177 whereby a' operation. V rotary movement of the worm-wheel 178 is An initial rotation ofthe gears 194 and inaugurated which continues until the com 196 S produced by lifting the cam-lever 188 pletion of a rotation, when the retraction of to establish operative relation between the 110 the worm-wheel section by encounter of the worm 177 and worm-Wheel 178. In the lug 186 with the cam-member 187 interrupts initial starting position o f the parts, the the operative relation between the worm and rock-level' 140 142. is in its less inclined wurm-wheel and causes the latter to stop. @lmnp-@planing position 1n which the nose he engagement of the lnner face of the lug 1&3 of t e arm 142 1s close to and beneath 115 186 with the outer face of the detent-arm 192 the contact-plate 1523*. As the s ring- Y causes the deiiection of the latter until the pressed tappet 198 performs a rotatlon, it lug comes in regis er with the holding notch iirst engages the plate 153r to retract the 193, when the det t-arm snaps into normal locking` lever 153 from engagement of its position with its notch embracing-said lug, upper notch 154 w1th"the pin 144, after 120 thereby locking the worm-Wheel in initial which the tappet engages the nose 143.01 the position. swinging rock-lever- 'rm 142 .and tilts the Secured to and adapted to rotate with the rock-lever to turn th clamp rock-shaft 76 worm-wheel 178 Iis a gear-wheel 194 to which whereby the clamp-j" ws are successively is rigidly connected the radially extending closed upon the work and spread. 125 clamp-opening tappet 195. .Loosely mounted In its tilting movement. with the rock upon the transverse shaft 1,04 and in inter- 'lever 140 142, the swin ng arm 146.is meshing relation with the gear.194 istlie thrown outwardly from .t e path of movegear 196 upon the hub of which is secured ment of the clamp-opening tappet. 195` by the rigidllltch-lever shifting tappet 197 engagement of a bent rod 206 with the 130 rounded nose of the cam-arm 116 which is at this time in a substantially vertical position upon its now stationary supporting shaft 104 previous to the eye-stitching operation. The engagement of the rod 167 with the rod 166 at the same time draws the swinging arm 159 of the locking lever out of the path of movement of said tappet 195, so that the latter performs an idle rotation at this time. After the stitching of the first side of the buttonhole, the stitch-forming.
mechanism receives a semi-rotation as be fore explained, whereby the shaft 104 is given a quarter-turn and the finger 115 and cam-arm 116 assume the positions represented in Fig. wherein the cam-arm is retracted from engagement with the rod 206 so as to permit the nose 146X of the swinging arm 146 and the contact-block 160 of the locking lever-arm 159 to return under thc action of the springs 148 and 16S into the path of travel of the tappet 195.
At the end of a buttonhole stitching and cutting operation, a second lifting of the cam-lever 188 causes a final rotation of the gears 194 and 196, during which the tappet 198 incidentally shifts the locking lever 153 but passes without engaging the nose 143 of the lever-arm 142 in its lower position` but it engages the finger 115 and carries it around until disengaged therefrom by the tripping lug 204 as before, described. After the engagement and release of the locking lever 153 by the tappet 198, the engagement by the tappet 195 with the contact-block 165 carried by the swinging arm 159 of thelocking lever 153 Iagain disengages the lever 153 from the pin 155 and while the rock-lever 140 142 is thus unlocked, engages the nose 146x of the arm 146, thereby tilting the rock-lever to open the clamp and draw its jaws together for a Succeeding operation, the rod 206 being carried upward by this movement sufliciently to clear the cam-arm 116 in its return to initial position.
The main-shaft 21 has loosely mounted upon its rearward end the peripherally grooved pulley-wheel 207 formed in its inner face with a cavity provided with a conical rim 208 to afford a clutch-member adapt ed to be pressed into operative frictional engagement with the conical rim of a clutch member 209 having its hub 210 fixed upon the main-shaft. The peripheral groove of the pulley-wheel 207 is adapted to receive the driving belt 211 extending from a. double-grooved pulley 212 upon a counter-shaft 213 mounted in bearings 214 depending from the bed-plate and driven by a, belt 215 from the source of power.
The pulley-wheel 207 has in its outer face a Athrust plate 216 provided with a convex central portion and secured thereto by means of fastening screws 217. This thrustplate is normally pressed outwardly for disengagement of the clutch-members 208 and 209 by means of a plug 218 fitted within an axial socket of the shaft 21 with a spring 219 interposed between the inner end of said plu and 4the bottom of the socket.
'lghe thrust-plate 216 is adapted to be engaged by the inclined adjacent faceof a wedge-piece 220 secured tothe clutch-lever 221 fixed upon the rearward end of a transverse rocl -shaft and carrying upon its outer end the pivotally mounted nose-piece formed with the angularly disposed arms 223 and 224 pivotally mounted upon said lever at their intersection by means of the pin 225. The arm 223 is sustained in normal position by engagement of the stop-lug 226 of the nose-piece with the edge of the lever 221, and the outer end of the same lies in the path of movement Aof the tappet 197 at the beginning of a-cycle of the machine, and as represented in full lines in Fig. 3. ln the initial rotation of the gearing 194 196, the tappet 197 acts upon the tripping piece immediately after the closing of the clamp and forces the clutch-lever 221 forwardly to couple the main-shaft with its constantly running driving clement 207.
Fixed upon the forward end of the mainshaft 21 is a hand-wheel 227 having a hub portion which constitutes one of two spaced thrust members of which the other is a fixed disk Loosely mounted upon the shaft 21 between thc thrust members 228 and 229 is a pair of collars shown as circular plates or disks 230 and 231 having upon their adjacent faces respectively the wedge-shaped projections or teeth 232 and 233 adapted for -wedge-like engagement, when said disks are relatively turned, to force them apart into frictional engagement with the adjacent thrust members or interposed washers 234 and 235.
The disk 230 is provided with a forked lug 236 embracing the forward end of the rock-shaft by means ofA which it is rev strained against rotation with the mainshaft. The other disk 231 has a lateral arm 237 upon which is fnlcrumed by means of the screw 238 the elbow-lever 239 formed with a lateral arm carrying a wearing block 240. The wearing blockis adapted to rest upon the eccentric periphery of a cam-ring 241 secured upon the hub of the disk 229. A depending arm of the elbow-lever 239 carries a stud 242 which enters a curved slot 243 in the cam-lever 244 fulcrumed `by means of the stud-screw 245 upon the post 246 rising from the bed-plate 1.
The cam-lever 244 is connected by means of the screwbolt 247 with the lower end of a link 248 whose upper end is attached by means of 'the screw-stud 249 to the forwardly projecting crank-arm 250 fixed upon the rock-shaft 222. The link 248 is normally drawn downwardly by a spring 251 to normally seat a stop-arm 252 thereof upon the'flattened upper end of the standard 246.
The rock-shaft 222 has also fixed thereon the rearwardly extending forked arm 253 provided with the short branch 254 and the 'longer branch 255 carrying the feed-tripping rod 62 before mentioned. The branch 254 is adapted for engagement by the operative shoulder of the an lar latch-lever 256 mounted upon the fixeufulcrum-screw 257 and having a rearwardly extending tail 258, such lever being pressed into operative en gagement with the member 254 by means of a spring 259 coiled around its fulcrumstud 257. The member 254 of the arm 253 is also adapted for engagement by the hooked outer end of the upwardly extending arm 260 of an angular locking lever fulcrumed upon the stud 261 and having a tripping arm 262 whose inturned extremity lies in the path of movement of the tripping stud 57 carried by the gear-wheel 39. The
tripping lever 260 262 is provided with the usual spring for throwing it into operative engagement with the member 254 of the arm 253. s
The cam-lever 188 carries a stud 263 embraced by the lower end of anA upright rod 264 whose apertured opposite end embraces.
a stud-screw 265 of a lever 266 mounted upon the fulcrum-screw 267 and'having an inclined outer end portion upper end, the rod 264 carries a roller-stud 269 adapted for engagement by the camfinger 270 fixed upon the rockingipin 271 which is journaled in the standard 4 and has fixed upon its opposite end a depending arm 272 with its lower extremity bent forwardly into an extension 273 formed intermediate the ends with ia shoulder 274.
`The arm 272 is normally pressed back# wardly into retracted position by-meanso a spring 275 secured thereon and having an arm resting upon the hub of the latch-lever 256.
Secured Vto the` frame member, 5 is a bracket 276 carrying a fulcrum-stud 277 upon which is mounted the rock-lever 278 the forward depending arm of which is formed with a finger-piece 279 and the upwardly and rearwardly extending arm of which carries a pivotal pin 280 to -which is connected one arm of the starting rod 281 which passes through an aperture 282 in the bracket 283 and is formed with an outwardly and rearwardly -directed extension 284 formed at its rearward extremity with a depending forked lug 285 embracing the extension 273 of the arm 272 and resting thereon intermediate the body of said arm and the shoulder 274. The starting4 rod 1s 268. Near the' shown formed with a stop-lug 281* adapted for engagement with the bracket 283 to limit the operativ'e movement of .said rod.
In the drawings, the parts are represented with the work-holder closed and the slitcutting mechanism in the positions assumed in a slit-cutting operation, the main-shaft with its controlling devices and the mechanism connected therewith being under the same conditions as exist at the beginning of a cycle of operation of the entire machine. To follow through a. complete cycle of the machine, it is therefore necessary only to assume that the slit-cutting has been completed and the clamp opened in readiness for a succeeding stitching and cutting operation.
Pressure upon the finger-piece 279 of the rock-lever 278 draws the starting rod 281 forward and thereby engages the forked lug 285 of the latter with the shoulder 274 of the rocking arm 272, which `causes the turning of the cam-finger 27010 lift the rod 264 for imparting an operative cycle of movement to the clamp-operating mechanism. The shifting of the clutch-lever 221 into operative position by this means serves to rock the shaft 222 by means of which the arm 253 is lowered into running position where it is initially retained by the spring-actuated latch-lever 256. The rocking of the shaft 222 further causes the elevation of the arm 250 and consequent rise of the ram-lever 2&4.
the action of whose cam-slot 243 upon the stud 242 is to disengage the contact-block 240` from the cam-disk 241 and remove the friction upon the thrust-members and 229.
The described movement of the arm throws the trippin rod 62 into engagement with the contact-p ate 59, whereby the detent-lever 46 is disengaged from the initial feed-pawl 32 and the feeding mechanism is thrown into action simultaneously with the starting of the main-shaft. The recession of the tripping stud 57 from the locking leverarm 262 permits the locking arm 260 to engage the extremity 254L of the rock-shaft arm 253 to retain the same in rimning position after the disengagement therefrom of the latch-lever 256 by the action of the stud 52 upon the ear-wheel'38. In the stitchin ot the seeon side of the bnttonhole the feeflrg mechanism reverses and the tripping stud 57 again moves into engagement with the locking lever-arm 262, thereby shifting the same to disengage the arm 26() from the with the kicking lever-arm 260. rockesliaft arni is depressed 1n startingA corresponding movement ot the camlover il which rocks the willow-lever 22:39 to bring the contact-Mock 'Jiu into forcible engagement with the periphery of the cani-ring 241 hy means of which the pressure disk Q31 is tnrncd to engage its teeth with those of the dish 23() wherehy fric-tion is applied to tho thrustanclnhers 228 and )2H to arrest the shaft 2i.
As shown and descrilied in our Patent No. LOBH, dated August i3, 1912, the slit-cuttingy mechanism comprises the rocklevcr LH carr \\'iuflr an upper rutter-nn-niher LHi' and sustained hy a rock-shaft 28S coneentrie with the fulcrunrscrcw 141 for thc clamp-operating mailt-lever, The lower cutter-member is moved into and out of operative relation with the upper cutter-member for a cutting operation hy means of a connection with the rock-lever 2R53 which is itselic actuated hf a triangle device composed of linksfl@ and 290 connecte-d hy the pivF otal pin 291 which is emliraced liy' the forn ward end of a link-har 292 having' its apertnred opposite end entered hy a cranlcpin 29)., upon a w11r|11-wl1cel 32M mounted upon a supporting stud 295. Lilie Ihe worin-wheel ahle toothed section 296 controlled in' its action hy the cannncd extremity 29T ot' a lever 298 mounted upon a rock-shaft i299 having secured npon its opposite end the depending arm 30() formed with a lateral lip 300".
The lil 2500* of the armiOO is adapted to he engaged hy the. hooked extremity 2,01 of a pan'ldever 302 pivotally mounted upon au upwardly extending arm 30? ot' an angle lever' tulcrumed upon a stud 301 carried hy an ui'nvardly projecting ea r 305 oi' the rock-` shaft arm and having;r a lateral arm 30G which is connected hy n'leans of the link 30T 1V hen the the main-shaft, the anglo-lever S03 306 is carried downward bodily andlis rocked by its link connection 30T with the stationary lever-arm 260, whereby the pawldevcr 302 is caused to rest upon the lip 300 of the arm 3U() of the c1Itter-control!inar deviceJ As the arm 253 rises at the completion of a stitching operation, the angle-lever 303 306 is rocked so as to draw the paivl-lever 302 forwardly and thereby shift the arm 80() to lift the ca1n-arn1 Q98 in opposition to its spring 308 to throw the cutter mechanism into action. One of the jointed sections of the link-har 43 is slidingly mounted Within a gnideway 309 iol a rising and falling' frame 310 connected with and actuated hy the cutter rock-shaft "FSSin such'nianner that when the upper-cutter carrying arm 286 descends for a cutting action, the frame SIQ rises and retracts the 1vork-cla1np from Stitching position into cutting position from meegaan which it is returned 'oy the descent of the frame 231i) cll'ccted hy the reverse movement ot the lever Just prior to the completion of a rotation of the cutter-actuating ivornrwheel 291, the rearward end of the link-har .292 engages the inclined forward extremity 26S of thel lever 26(3 thereby lifting they rod 261 and imparting the second oinrative. mov'cinent to the cam-lever 138 to effect the tina] Cycle of operation ot' tho actuating mechanism for the claninoz-erating roclclever, the operation ol' which is as hasbeen already described.
In the rise of the laterally swinging leverarm liti under the action ot' the tappet 195 in opening the work-clamp. the end of the rod 2U() encounters the arm 221 of the nosopiece carried by the clutch-lever 221,y thus turning ther same into the dotted lino position represented in Fig. 3. wherein the arm 223 is lifted out ot' the path of movement of the still moving' tappet 19S so as to prevent a reclnti'rhing of thc :nain-shaft to its driving element 30T at this time.
While the several trains of mechanism associated together in the machine shown in the drawings have been described in detail. hoth as to their constructivo features and their craperation in the production of a stitched bnttonhole, it is to he understood that the` invention embodied therein is snsccjitihle of emhodiment in different types of mechanism and in widely ditl'erent forms and relations than those shown and described herein.
[laying thusl set forth the nature of the invention7 what we claim herein is:-
1. 1n a inittonhole stitching machine, the combination with a Work-clamp, stitch-forining and tiredinar mechanisms, and actuating vmeans therefor. of nie-ans independent of said. actuatingV means and adapted to actautoinatically and imsitively upon the clamp to open and close the same.
2. ln a hattonholo stitchingr machine. thel combination with a work-Clamp, stitchfolming and feeding' mechanisms, slit-Cntting mechanism` and successively operating.lr means for actuating the stitch-forming and Jfeeding); mechanisms and the cutting mechanisnny of means acting independently of said actuating means for automatically closing and opening,r said clamp. Y
3. In a buttonhole stitching machine. the combination with a work-clamp, stitchformingr and feeding mechanisms, slit-cnt? ting mechanism, and independent and snocessively opeating means for actuating the stitch-forming and feeding mechanisms and the cutting mechanism, of neans acting independently of said actnf .zing means for automatically closing ant opening said clamp, and controlling devices therefor .whereby the successive closing and opening of the clamp are timed to occur respectively he tore and after the operation of said actuating means for the stitch-forming and feeding mechanisms and the cutting mechanism.
Ll. ln a` buttonhole stitching machine, the rifombnation with a. Worleclamp, stitch- ?orming and feeding mechanisms, slit-cutting mechanism` and successively operating means for actuating the stitch-forming and feeding mechanisms and the cutting mechanism, of cl:Hup-operating means acting indei'wndently of said actuating means for effecting the closing and opening ofvthe clamp, means for effecting actnati,g|1,ei`4 tin;h ela:np-operating means both befoitiind after the operation of the stitch-forming, feeding and ,'ntting mechanisms in fach buttonholeproducing cycle5 and controlling means ainsi-ebpr the clamp is caused to be altcrnatel \r closed and opened.
ln a` huttonhole stitching machine, the combination with a work-clamp, stitchfocniing and feeding mechanisms, means including a rotaryv shaft for olierating the saine, a constimtly rotating driving element, and a clntch device including a. swinging lever ivluirebjiY said shaft may be coupled to the driving element. of dauin-actuating means with connections with the clamp whereby the latter is opened and closed, and means carried by said clamp-actuating means and adapted to move the clutch lever into starting position for setting in motion the stitch-,forming and feeding mechanisms.
(l. In a buttonhole stitching machine, the combination with a work-clamp, stitch-forining and feeding mechanisms, means for imparting operative movements thereto, and means for turning the stitch-forming mechanism during the stitching of the eye of an cyelet end butt-onholc, of chimp-operating means independent of the operating means for the stitch-forming and feeding mechanisms whereb)r the. clamp is opened and el sed respectivelyat the beginning and end of a` buttonhole-producing cycle, and means connected with the clamp-operating means for turning the stitch-forming mechanism into initial position after eac stitching operation.
7. In a buttonhole stitching machine, the, combination with a. Work-clamp, stitchlorming and feeding mechanisnis, means for imparting operative movements Jthereto, and means for turning the stitch-forming mechanism during the stitching of the, c ve of an c vclet-end buttonhole, of clamp-operating means timed for action both before and after a` buttonhole stitching o eration and hicluding a rotar)T element adilpted in its first actuation to close the clamp` and in its succeeding actuation to turn the stitch-forming mechanism into initial position. r
8. In a buttonhole stitchingr machine2 the combination with a work-clamp, stitchforming mechanism, feeding mechanism for producing the reverie' feeding movements between the stitch-forming mechanism and the walt-island), and including dwell-producing means having a connection With the stitch-forming nniehaniem whereby the latter is given senil-Mutation for the Stitching ol one enitof a buttonhole, and actuating means for the stitch-forming and feeding meehanisms, of elamp-operating means independent ol the actuating means for the stileli-lorniing and feeding mechanisms wherebyY the clamp is opened and closed respectively at the beginning and end of a butfonhole-iwnrlneing evele, and means connected with the el:mm-inicrating means for turning the stitch-forming mechanism into initial position after each stitching operation.
il. ln a lluttonhole stitching machine, the combination with stitch-forming mechanism, a Whale-china), and means for producing relative feeding` movements between the stiteluforming mechanism and the Workelamp, of work-clamp operating means mounted separately from the work-clamp and adapted to close and Open the latter, and a permanent connection between said operating means and the work-clamp adapted to follow .said feeding movements.
10. ln a button hole stitching machine, the con'ibination 'with stitch-forming mechanism. a work-clamp, means for producing relative feeding movements between the stitch-forming mechanism and the workclamp` and adjusting means whereby the length of relatiie traverse of the workelamp and stitch-forming mechanism may be varied. of work-clamp operating means mounted .f-'ei'iaratelv from the work-clamp and adapted .to close and open the latter, and a permanent connection between said nia-rating means and the work-clamp adapted to follow said feeding nmvements.
11. ln a bnttonhole stitching machine, the combination with stitch-forming mechanism. a work-clamp provided with relatively movable upper and lower jaws and means including a toggle` device for closing said 'aes toe'ether and maintaininor theming relative feeding movements between the stitch-forming mechanism and the Workc'lainp, of work-clamp operatingmeans, a
permanem connection between said operating means and the work-clamp adapted to follow said feeding movenints, means applied to an element of said clamp-operating means for locking the same against operative movement during a stitching operation, and means for controlling the action of said locking means.
13. In a buttonhole stitching machine. the combination with stitch-forming mechanism, a Work-clamp, and means for producing relative feeding movements between the stitch-forming mechanism and the workclamp, of Work-clamp operating means, a permanent` connection between said operating means and the work-clamp adapted to follow said feeding movements, means applied to an element of said clamp-operating means for locking the same against operative movement both in clamp-opening and closing positions, and means for controlling .the action ot said locking means.
v 14. In a buttonhole stitching machine, the combination with stitch-forming mechanism, a work-clamp, and means for producing relative feeding movements between the stitch-forming mechanism and the workclamp. of work-clamp operating means, a permanent connection between said operating means and the work-clamp adapted to follow said feeding movements, means applied to an element of said clamp-operating means for normally maintaining the latter in either of its extreme positions, and controlling means for disengaging the locking means from said element both before and after a buttonhole stitching operation.
15. In a button-hole stitching machine, the combination with stitch-forming and feeding mechanisms and actuating means therefor, of a work-holder comprising pairs of separable clamping jaws movable laterally toward and from each other and formed with inclined grooves, a spreading plate provided with inclined ribs fitted within the grooves of said clamping jaws and with spaced shoulders, a clamp-operating device provided with contact fingers adapted respectively to engage the clamping jaws and the shoulders of the spreading plate, and ac- `tuating means for said clamp-operating device whereby the clamping jaws are snccessively closed upon the work and spread preparatory to the stitching operation.
16. A work-holder for buttonhole stitching `machines comprising pairs of separable clamping jaws movable laterally toward and from each other, 'a toggle device for drawing said jaws into clamping relation, a slideplate operatively connected with a member of said toggle device and provided with divergent guides each connected with one of the jaws of each pair, and means for actuating said toggle device for Opening and scemo closing said jaws and for imparting thereto relative lateral. shifting movements.
17. A work-holder for buttonhole stitching machines comprising pairs of separable clamping jaws movable laterally toward and from each other, a toggle device for drawing said jaws into clamping relation, a
. slide-plate` provided with divergent guides each connected withone of the jaws of each pair, a loose connection between an element of said toggle device and the slide-plate whereby the latter is causedto erform its operative spreading movement a ter the toggle device has performed the clamp-jaw closing portion of its movement, and means for actuating said toggle device.
18. In a buttonhole stitchin machine, the combination with a work-c amp, stitchforming and feeding mechanisms, slit cutting mechanism, and independent and successively operating means for actuating the stitch-forming and feedin mechanisms and the cutting mechanism, o means independent of said actuating means for automatically closing the clamp, and means actuated by the clamp-closing means for setting in motion one of said actuating means.,
19. In a buttonhole stitching machine, the combination with a Work-clamp, stitchforming and feeding mechanisms, slit-cutting mechanism, and independent and successively operatin means for actuating the stitch-forming an feedin mechanisms and the cutting mechanism, o means independent of said actuating means for automatically closing the clamp, controlling means whereby the actuating means for the stitchforming and feeding mechanisms may be thrown into and out of action, and an operative connection between said controlling means and the clamp-closing means.
` 20. In a buttonhole stitching machine, the combination with a Workclamp,stitchf0rm ing and feeding mechanisms, means for imparting operative movements to the stitchforming and feeding mechanisms, and means or turning the stitch-forming mechanism duringthe stitchin of the end of a buttonhole, of clamp-closing means, clampopening means connected to and movable simultaneously with the clamp-closing means, and means controlled by the turn ing means of the stitch-forming mechanism for interrupting`-and establishing operative relation between the clamp-opening means and the clamp.
21. In a buttonhole stitching machine, the combination with stitch-forming mechanism, a work-clamp, and means for producing relative feeding movements between the stitch-forming' mechanism and the workclamp, of work-clamp operating means comprising a rock-lever, a flexible connection between the` same and the work-clamp, and actuating means including tWo diierentially moving tappets adapted to act positively upon said rocklever to rock the same alternately in opposite directions.
22. In a buttonhole stitching machine, the combination with stitch-forming mechanism, a work-clamp, and means for producing relative feeding movements between the stitch-forming mechanism and the workclamp, of the work-clamp operating means comprising a rock-lever, a connection between the same and the work-clamp, and actuating means including two rotary tappets geared together for rotation in opposite directions, means for insuring the alternate engagementoi said tappets with said "r-lever, and means for imparting to said tappets two rotationswith an intermediate period of rest for each buttonhole stitching operation. i
23. In a buttonhole stitching machine, the combination with stitch-forming mechanism, a work-clamp, and means for producing relative feeding movements between the stitch-forming mechanism and the workclamp, of work-clamp operating means comprisinga rock-lever provided with a rigid Varm and a swinging arm adapted for movement laterally transversely to its rocking movements, a connection between the rocklever and the work-clamp, actuating means including a clamp-closing and a clamp-opening' tappet with means for imparting operative movements thereto, and means for shifting the swinging rock-lever arm out of operative relation with the clamp-opening tappet during the action of the clamp-closing tappet upon the rigid rock-lever arm, and for thereafter restoring said swinging arm to operative relation with the clamp-opening tappet.
24. In a buttonhole stitching machine, the combination with stitch-forming mechanism, a work-clamp, and means for producing relative feeding movements between the stitchforming mechanism and the work-clamp, of work-clamp operating means comprising a rock-lever, a connection between the same and the work-clamp, a normally operative locking device for preventing the movement of said rock-lever, a clamp-closing and a clampopening tappet adapted for action successively upon said rock-lever and upon said locking device preparatory to each engagement with the rock-lever, meansfor imparting operative movements to said tappets,
combination with stitch-forming mechanism,
a work-clamp, and means for producing relative feeding movements between the stitchforming mechanism and the work-clamp, of work-clamp operating means comprising a rock-lever provided with a rigid arm and a. swinging arm adapted for movement laterally transversely to its rocking movements, a connection between the rock-lever and the work-clamp, a vnormally operative locking element provided with a rigid shoulder and a laterally yielding shoulder movable transversely of the direction of rocking movement of the rock-lever, a clamp-closing tappet' adapted for successive engagement with the rigid shoulder of the locking element and the rigid arm of the rock-lever for unlocking and shifting the rock-lever to close the clamp, a clamp-opening tappet adapted for successive engagement with the yielding shoulder of the locking element and the laterally swinging arm of the rock-lever for unlocking and shifting the rock-lever to open the clamp, means for actuatin said tappets, and means for preventingt e effective o eration of the clamp-opening tappet whie the clamp-closing tappet is in effective action.
26. In a buttonhole stitching machine, the combination with stitch-forming mechanism, slit-cutting mechanism, operating means for said slit-cutting mechanism, a work-clamp, means for producing relative feeding movements between the stitch-forming mechanism and the work-clamp, and adjusting means whereby the length of relative traverse of the work-clamp and stitch-forming mechanism may be varied, of automatically acting means independent of said o perating means and unaffected by said adJust- Ving meansfor closing and opening the clamp respectively at the eginning and end of` a buttonhole-producing cycle. i l
In testimony whereof, we have signed our naines to this specication, in the presence Aof two subscribing Witnesses,
JAMES G. GREENE. LOUIS F. A. BUCHNER. Witnesses:
HENRY J. MILLER, HENRY A. KORNEMANN, Jr.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4659001A (en) * 1983-04-15 1987-04-21 William Prym-Werke Kg Machine for applying articles of hardware to tensioned textile materials

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4659001A (en) * 1983-04-15 1987-04-21 William Prym-Werke Kg Machine for applying articles of hardware to tensioned textile materials

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