US1453274A - holmgren - Google Patents

Description

FMMWLMM. Mmmm- E. A. HOLMGWIIEN MACHINE Fon SHAPIE UPPERS OVERLASTS Filed 00u22, 1919 liwateijitetil llttliaii' il, lltwlmili,

. ai in a nali i oonieonefiinin, on han lhtli-lilitlllill lll .illtlllll llil ilMW lill il lll l i .application tiled tloitobei dit, `Milli. eerial lilo. 332,5?il2i.

To allie/tom t 'may concern.' o it knownthat ll. lEnio di. identiteiten, a citizen oi the llnited States, residing at lijven, in the county ot lisser; and itateoi lllassachusetts, have invented certain lion proveniente in lll/ilaehines: 'loir jihaping Uppers @ver Lasts, ot which the ifollmvingdescriptionj in connection With the accompanyinp; drawings, is aspeciiication, like reiference charact rs on the drawings indicating1 like pants in the several. figures.

'l`his invention relates to machines 'toit shaping; uppers over las s, and is herein shown as applied to a. Ina chine having;` ineens tor pnllinfl` an inoperover its .last and nieans tor overlaying and tasteninn` the margin ot the upper. 'llhe invention is heiein illusn tii'ated by reiterence to characteristic f features ott a well known type oft polling-eveil? inacliine the ,Qjeneiral organisation of ivhich is shown and described in United itatcs liet ters Patent dilo. 1,029,387, planted on inne with 1912, upon an application o'tlt. l?. lilo lileely, but it Aivillibi-i `lindeietood that the invention is not liinitcdin its application to machines oft this particular type.` i lin object `oit the invention to that the fastenings Wherebythe upper Y shall `be located in proper relation to the ed e'e oi theshoe bottone, and to this end a iiiealtnie oit the inifention; consie s in a novel nisni tot' contieolliii the itasteninp; africains. Tllhe inventioii is herein shown as applied to a type oi" construction comprisin infr and lastcningi inea/ns amant, n

.mowed inwardly toivard the shoe apninst the resistaiice ott the teneioned upper by mechanism parte el which `are relatively niovable in response to resistance encoun tered by sach nieans in its: inward inoveinent to actuatethetastener driving ineens,and`

ineans controlled b v the shoe tor insuring;

' Wit ve movearrived substantially in position for driving the tastenings. Further objects are to provide a construction requiringY comparativelg7 little povven :tor its operation and avoiding objectionable strains on the operating parts, and additional ifeatuies oi the invention are to be recognized in the novel construction whereby these objects are attained.

ln a tui-ther aspect, a [feature ott the invention to he recognized in the provision et a predetermined relation between the shoe and the overl aying and fastening1 means, the construction shown comprisingmenibers positioned in accordance with the Width ot the shoe foi interrupting they positive connec- 70 tions between the side overlayinp;` and 'tackw inp; devices and theii' .operating ineens only when said devices have been moved to pon sitions determined by the shoe. Still another feature consists in the provision oiI 75 supplemental means for assisting in prevent-- inq outward return nioveincnt oft overlaying; and ilfasteningM ineans inthe upper` 'liastenfing. operation.

lhese and ot-heiI t'eatnres `ofthe invention, inclndinp; ceitain details of constriiction and combinations ot parte, will new be described h reiieifence to the accompanying difaivand -poiiiited ont in the claims.`

Lhedi'awinns: lilipj. l 's a view substantially in firent ele-A vation, with parte shown in. section, eti a portion `oiE a pnllinggnveii' inacliine in which i the invention incorporated:

lling. it is a view ot a poition oii the nicchanisin o'i llioj. l, showing the parts as positioneill at an earlier "tiinein the cycle oit operations; and

lFin'. is a vien7 substantially in plan,with parteJ in section, showing a portion oill the niechanisiin t'or operating;r the overlatying and iliaetening devices shown in l lli/lachiiiies otV the illustrative type. "lullv shown anddesc 'bed in said prior liiicleelv patent, eonipiise in their oinanizatioii grippeis tor l the upper at the end and oil?` the last, the 'present the side ,erippcri's only which are connected to upfdraiv levees 2 and are operated to pull the upper against the resistance ot' a sole rest lin engagement with which the shoe is initially po. 'lCheU sei/etal prippeis are opeifated the upper over the last and then hold the upper under tension with the machine at rest to permit inspection and adjustment of the work. Following a subsequent starting of the machine, shoe rclamping and supporting devices 6 are swung inwardly against the shoe at its opposite sides and either immediately or following a second period of rest in the cycle of operations, overlaying and fastening devices are moved inwardly at the toe end and at the opposite sides, the grippers being tripped bythe inward movement of these devices to cause them to release the upper and the tacks or equivalent fastenings being nally driven to secure the margin of the upper in place.

l Only the devices for overlaying and fastening the upper at the sides are shown in the accompanying drawings, these devices comprising side arms 8 which are mounted to swing laterally of the shoe about supporting bearings 10. Mounted on the lower ends of theV arms 8 are overlaying wiper Vplates 12 which are supported under tack carrying blocks 14 in such manner as to permit them to-tip upwardly and downwardly and also to yield backwardly against the resistance of the shoe materials. The outer ends of these plates are curved upwardly over rolls 16 which are mounted on spring plungers 18 and are pressed upwardly against the curved outer ends of the plates to. hold the plates with their upturned inner ends normally in a downwardly inclined and advanced position. The wiper plates are thus arranged to engage the shoe below the edge of the sole or insole while the upper is still held by the grippers and, as the arms 8 are advanced, to wipe the upper with firm pressure over the edge of the insole and inwardly from the edge. During this operation the wiper plates may yield upwardly and backwardly under the control oi the spring Vplungers 18, as shown in Fig. 2. In the continued movement, of the arms, the grippers are tripped to cause them to re lease the upper, whereupon the decreased resistance permits the spring plungers 18 to react and to wedge the wipers farther inwardly while forcing their inner ends downwardly against the shoe with substantial pressure. With the parts thus positioned the tacks are driven to fasten the margin ofthe upper in place.

The tacks may be fed to the tack blocks 14 in a well-known manner, as illustrated in said prior patent, and as thus positioned in the blocks are operated upon by drivers 20 whiehvare mounted on driver bars 22 slidably supported on the arms 8 and connected at their upper ends'to spring operated driver arms 24. The driver bars 22 are provided with shoulders 26 (Fig. 8) which are engaged by the edges 28 of slides 8O to uphold or lock the driver bars normally against the pressure of the arms 24. The slides 30 are mounted on a bracket plate 82 which is pivotally supported on a shaft 34, and are connected by means of gear segments 36 to a slide bar 88 whereby movement is imparted at a definite time in the cycle to the slides 30 to withdraw their edges 28 from under the shoulders 26 and permit the driver bars to be operated to drive the tacks. Subsequently, in the return of the parts to starting position, the bracket plate 82 is swung downwardly and then upwardly, the slides 30 being in the meantime. returned to their outer positions to cause them to engage under the shoulders 26 and to lift the driver bars in preparation for the operation of the machine upon another shoeA For more detailed information with respect to the construction and mode of operation of the parts as thus far described, reference may be made to said prior McFeely patent.

As in prior constructions, the slide 38 and its connected mechanism are further utilized as means for swinging the toe and side arms inwardly to overlay the margin of the upper and to position the tackers in operative relation to the shoe. For the purpose of thus operating the side arms 8 shown in the drawings, the present invention provides novel mechanism connecting the slides 30 to the lower end portions of the arms. Pivotally mounted to swing about the same axes as the arms 8 are operating arms 40 provided between their opposite ends with lateral extensions 42 ,carrying balls 44 engaging in guideways 46 formed on the outer ends of the slides 30. these guideways being curved about the axis of movement of the plate 32 to permit the plate to swing as hereinbefore described without interru ting its connection with the arms 40. 1 t their lower ends the arms 40 are connected to the side arms 8 by toggle mechanisms each comprising a lever 48 pivoted on the arm 40 and connected at its inner end to a lever or link 50 which is pivoted at 52 ou the arm 8. A spring 54 connected to the outer end of the lever 48 tends to hold it against a stop pin 56, in which position it is substantially in line with the link 50 and co-operates with the link to provide a rigid connection between the arm 40 and the arm 8. Through these connections movement is imparted positively to the arms 8 by the inward movement of the slides 30 to operate vthe wipers and to carry the tackers into proper relation to the edge of the shoe bottom.

Depending from the pivot pin 52 is a finger 58 which is arranged to bear on the end of an adjustable screw 60 carried by a depending lug on the link 50, and in the inward movement of the arm 8 engages an abutment member 62 on the underlying clamping device, as shown in Fig. 2, the

lposition ,of the member 62 being determined lil (l tl initieert toggle i, fill :ind interi'uin the i itive connection between the two orme. 'lo tecihtnte the lneol;:ing el" thetognle n, nin :ind elet connection ie provided between the i u ncent cinte et the menil'iere il?) ond 50. .l`he :trui /li'l then beconiee operative through e. eijirinig beiq which is guided by n rod titi 'hiet on the erm il end extending loosely through n. elet in the erm -l-(L to emily yielilinn" pressure to the. :ii-m Si whereby e. slight 'l urther movement ot the erin El to position the tei'fltinn mochte niem reh-itively to the shoe nmy he elliot-,ted :inaiinet the deci-ceased reeissstzince. te the erin arrivee et its; limit ot inward nievemen t determined by enen/nement with e Shoulder 68 on the underlying clninninn' device, continued movement et the erm l0 nerves to comiiireee the epi'inn ttlto hold the teclinn mechanism securely in oper" tive ipoeition7 euch movemeiit ot the erm beinel eccoinneuied by movement ot the Slide ltlrelntively to the new etetioiurry erin tl, ne herein betere explained to withdrew its cdne 28 iti'oin unifier theehoulder 26 on the driver ber Q2 eind thne relenee the driver bei' und cefuse the tech or techn to be driven.

llrom the ebove deecription it will he evident that the @renter portion ott the intvrird movement et each ot the orme tl sind its sun- ;iorted overhiyinn' sind 'toetriinn l vicee, during,- the time tlnit the grreuteet rc tence ie encountered in winnie; the upper over the ciliije ol'4 the Sole nml inpreeeiug; the wipers inivni'i'lly :tintinsfit the mornin et the upper while the letter 'is still. held by the erinnere,

eithlected through zi positive connection,

:ind that it is only when the reeisiteiue is euhsilnntiolly decreased; by the triiipinnj et" the irripiiiere theft the positive connection ie interrupted by the breztlringu ot the ti, le. fitter the tonele is; broken `the ein'inn tl-l; serves zie e. eutliciently etleetive connection between the two :irme to cem-:e the inward movement oit the erin El egeinet the decreeeed reeifnence to be completed prior to such :in extent ot i'eletive movei'nent between the mme 8 end l() es to conne the ednge ol" the Slide fill to be ivithdrevvn :troni under the ehonlder on the driver bnrn fle Soon ee the Liiiiverd movement oit the erin tl ie etonne/Qi by engegeinent with the :tbutnicnt ehoill-zler 68, the continued movement et the slide 30 Serves to release the driver bei: :ind enlise tl e techs to be drivein the tncltinnj deviceo now being; peeitioned ind leid by the outing 6ft tributes to eitlectiveneee in the relation to the edge el' the shoe bottom. determined by the abutment 68. lt will be evident thnt this construction not only conin the ect-ion ot the wiper platee, but also erlords insurance egminet drii" the tec-ire in en incorrect locetion ne has I`ometimee happened in. the use et prior conetrnetione on henry Shoes. by reason otreeistence ot the shoe materiels enllieieut to overcome the tension oit the yieldinle 'portion ot the oi'ieretinr; connectione sind confie premntiiirc relceee oi the driii'ez here. ln the construction herein. ililio'ivn the overleyinggr :ind :toetening:ineens moved invvzirdly by positively operating' meclniniein which is under control et the .ehe-e through the ebutlnents (SQ on the side clamps to insure e predetermined relzition between Seid ineens end the shoe betere the toeteninn'e con bc driven, lt Will elec be evident that the arrangement whereby the operating;r ineens tor the erm 8 is connected to the :iim :it its lower end :i-djzicent to the overlnyinn :ind to ringr devices ie eflective guarding a," euch Strain on the erin :is might ceuee the` driver bor to bind on its bezu'ingv :ind also permite the inward movement ol" the erin to be ettected by the use ot lese power thon required Where the oneretnol connections are positioned approximately midway oit' the length of the erm es in prior coi'ietructiene.

llllhile the invention is herein shown ne embodied in` mechziniem designed to operette et the Sides oi the Shoe, it will be understood thet the invention ie not thee limited but is eppliceble :ilse to the menne whereby similar operntione :ire peitormed et the toe end oit the shoe.

llletui'cs ot the upper grinning mechanism herein shown me not chiiniicd in, this applicntion but in n, divinionzil niinlicetioin lliciiel lilo, tif-flfdlltli tiled lvlni'ch id .1922.

lilzivingr deecribcd the invention, what 'l cleini ne new end desire to secure by Letters Potent ot the United @tetes is:

l. ln n .machine ot the close described, the combination with. menne tor pulling- :in upper over n lash of everlaying; ond fastening ineeneyend mecheniem for moving; eziid overleyinn find. testi-ming ineens toward the Shoe incl-udine; parte arranged 'tor relative 1novenient in reeponee to resistance encountered by seid menne in its movement toward the shoe to :ictuete the :testeninn ineens end a poeitively operntinn; device tor preventing the relative movement oit seid inerte until the fastening); menne hos arrived in n predetermined relation to the shoe.

52;. ln o, machine of the claves described, the combination With ineens tor pulling; en upper over e last, et overlevingl and teetening' ineens, mechanism for moving seid overlayiun and fastening ineens towerd the shoe including parte arranged tor relative move tltl titl

lill).

litt@ ment in response to resistance encountered by said means in its movement toward the shoe to actuate the 'fastening means and device for normally preventing the relative n'iovement oi' said parts, and means arranged to act on said device at a definite point in the movement of said overlayingr and fastening means toward the shoe to cause the actuation of the fastening means.

3. In a machine of the class describedr the combination with means for pulling; an upper over a last, ot overlay/ing?I and "asteninlgr means, mechanism for moving;r said overlayingz and fastening' means toward the shoe including parts arranged for relative movement in response to resistance encountered by said means in its movement toward the shoe to actuate the fastening means and a toggle arranged to be held substantially straight to prevent the relative movement of said parts, and means operative at a detinite point in the movement of' said overlaying and fastening means toward the shoe to break said toggle and cause the actuation of the 'fastening means.

4. In a machine of the class described.y the combination with means for pulling` an upper over a last, of overlayinp; and fastening; means, mechanism tor moving said overlayingr and fastening means toward the shoe including parts arranged for relative movement in response to resistance encountered by said means in its movement toward the shoe to actuate the fastening means and a device for normally preventing the relative movement of said parts, and means including a stop into operative relation to which said device is carried by the movement of said overlaying and fastening means toward the shoe for operating' said device to cause it to release said parts 'for relative movement.

5. In a machine ot the class described. the combination with means .'lor pulling an upper over a last. of overlayinn` and fastening; means, mechanism for moving said overlaying and fastening means toward the shoe including' parts arranged for relative movement in response to resistance encountered by said means in its movement toward the shoe to aetuate the fastening means and a toggle arranged to be held substantially straight for normally preventing the relative movement ot said parts, and toggle operating' means including a stop arranged to become operative' at a definitepoint in the movement of said overlaying` and fastening means rtoward the shoe to brealr the toggle and cause the actuation of the fastening means 6. In a machine of the class described, the combination with means for pulling; an upper over a last, of overlaying and. Yfastening means including a driver bar, mechanism `tor moving said overlaying and fastening means toward the shoe comprising a member arranged to hold said driver bar normally against driving;r movement and a, device for preventing relative movement between saidv member and the driver bar to release said bar, and means for operating said device at a predetermined point in the movement of said overlaying and fastening means toward the shoe to cause the release ofA the driver bar by movement oi" said member.

7. In a machine of the class described. the combination with means for pullingr an upper over a last oi overlaying and 'fastening means, operating ineclianisn'i comprising; ar positive connection to said overlaving and 'Fastening means to torce said means inwardly toward the shoe. and means `for breaking' said positive connection at a definite point in the inward movement ofi said overlaying and fasteningT means. said operatinp; mechanism including parts relatively movable when said connection is broken to actuate the fasteningr means.

S. In a machine of the class described` the combination with means 'For pullinfr an upper over a last, of overlaying and tiisteniner means including a driver bar. operating mechanism comprising' a positive eoimection to said overlaying; and 'fasteningr means to 'force it inwardly toward the shoe, and means for substituting a yieldingconnection for said positive connection at a definite point in the inward movement ot said overlayingr and fastening` means. said operating mechanism including' a device for normally holding said driver bar against driving movement and operative when said positive connection is interrupted to release the driver bar.

9. In a machine oi the class described. the combination with means 'for pulling' au upper over a last. ot ovcrlayiuxr and 'lhsieuimr means comprisingT a supporting arm mounted for movement toward and from the shoe and a driver bar mounted on said arm` an operating member having means for normally holding said driver bar against drivingI movement`r a second arm mounted for movement toward and from the shoe and connected to said member, :i positive connection between said arms through which movement is imparted trom said member to the iirst named arm to carry said overlayinn; and Jasteninnr means inwardly toward the shoe and means operative at a. definite point in the inward movement olE said arms to break said positive connection and per mit member to move relatively to the irst arm tor releasing' the driver bar. p

l0. In a. machine of the class described, the combination with means .for pulling an upper over a last. of overlaying and fastening` means comprisingY a supporting arm mounted for movement toward and from. the shoe and a driver bar mounted on said arm7 an operating member having means eol the combination with shoe the combination with l shoe positioning means, of overlaying and fastening means, anarmmounted V,for movement inwardly tolwardthe )shoe .and upon the outer end of which sai'd'overlaying and fastening means is supported,A a second arm also mounted for movement toward the shoe, means connected toi'said last named arm to move it inwardly. andaconnection between said last named arm-,and the outer end portion of the iirst arm for imparting inward movement to said Erst arm.

Q0. In a machine ofthe class described. i positioning` means, of upper fastening means comprising a supporting arm mounted for movement inwardly toward the shoe, a second arm also mounted for movement toward the shoe, .means connected to saidlast named arm to move itinwardly, a positive connection tween said two arms for imparting operative movement tothe rst arm, and meansoperative at a predetermined point in the inward movement of said arms to substitute a yielding'connection; for said positive connection.

21. na machine-ofthe class described, thecombination with shoe positioning means, of upper fastening means comprising a supporting arm mounted for movement inwardly toward the shoe, a second arm also mounted for movement toward the shoe, means connected to vsaid last named arm to move it inwardly, a toggle connection be- I tween said arms arranged to be held substantially straight for imparting movement positively to said first arm, means operative at a definite point in the inward movement of I the arms to break said toggle, anda spring Lbetweenpsaid arms to apply yieldingpressure toY the first arm to hold it in operative position when the toggle is broken.

Q2. In ar machine lof the class described, the combination with shoe positioning means, of upper fastening means mounted for movement inwardly into operative relation to the shoe, operating mechanism comprising a positive connection to said fastening means tomove it inwardly and a member movable relatively to the fastening means to actuate it when' saidpositive connection is broken, andmeans for breaking said positive connection when the fastening means has been moved substantially into operative position.

vQt/Inya'machine of the class described, the combination with shoe positioning means, of upper fastening means mounted for movement inwardly into bperative relation to the shoe, operating mechanism comprising a toggle arranged to beheld substantially straight for imparting inward movement positively to said fastening means and a member movable relative to thefastening *meansl to ac` tuate it when saidtoggle is broken, means for lbreakir'igsaid toggle when the fastening means has been moved substantially into operative position, and yielding means for holding the fastening means in operative position after the toggle is broken.

in a machine of the class described. the combination with shoe positioning means, of upper fastening means mounted for movement inwardly into operative relation to the shoe and including a driver bar and a controlling member movable relatively to the driver bar to release it, a device for preventing relative movement between said member and trie driver bar as the fastening means moves toward the shoe, and means arranged to act on said device at a definite point in the inward movement of the fastening means to render the device inoperative to prevent movement of said member relatively to the driver bar.

25. in a machine of the class described, the combination with shoe positioning means. of upper fastening means mounted for movenient inwardly into operative relation to the slice, mechanism for moving` said fastening'.- means inwardly including parts arranged for relative movement to cause the .fastening operation to be performed, a device for normally preventing the relative movement of said parts, and means arranged to act on said device at a variably predetermined point in the inward movement of the fastenine` means to render the device inoperative to prevent relative movement of said parts` 2C). ln a machine of the class described. the combination with shoe positioning means. of upper fastening means movable inwardlyl into operative relation to the shoe, mechannisin for operating said fastening means to fasten the upper, and a positivelivv opta-atinedeviee for preventing the operation of said mechanism until the fastening means has arrived in a definite relation to the shoe.

2.7. ln a machiiie of the class described. the eon'ibination with shoe positioning means. of upper fastening means movable inwardlv into operative relation to the shoe. mechanism for operating` said fasteningr means to fasten the upper, a device for normallv preventing the operation of said mechanism. and means arr: nged to act on said device at a definite point in the inward movement of the fastening means to render it inoperative to prevent the operation of said mechanism.

2S. ln a machine of the class described. the combination with shoe positioning' means. el upper fastening means comprisingr :i sunporting arm mounted for movement toward and 'from the Ishoe and a driver bar mounted on vsaid arm, an operating member havingr `means for normally holding said driver bar against driving movement. a connection between said member and arm for moving said arm toward the shoe. and means operative at a definite point in the inward movement of tion for said positive connection when said over-laying and fastening means has been moved to a position determined by the shoe.

38. In a machine of then class described, Iche combination i ith shoe positioning meansv of means for o erlaying and fastening the margin of the shoe upper, said overlay g and fastening means being movable toward the shoe into upper fastening position, a; operating"member.j a positive connection between said operating member and the overlaying a ,d fastening` means for moving said means toward the shoej and mechanism controlled by the shoe for interrupting said positive connection at a point in the movement of said over-laying and fastening means determined by the shoe, said mechanism being adjustable to vary the time when said positive connection is thus interrupted.

39. In a machine of the class described, the combination vith shoe positioning means, of means for overlaying and fastening the margin of the shoe upper, said overlaying` and fastening means being movable toward the shoe into upper fastening position, and operating` means for moving said overlaying and fastening means inwardly toward the shoe and for then actuating the fastening means to fasten the upper comprising mechanism controlled by the shoe for positively insuring a predetermined relation between the shoe and said overlaying and fastening means before the actuation of the fastening means takes place.

40. In a machine of the class described, the combination with shoe positioning` means, of means for overlaying and fastening the margin of the shoe upper, said overlaying and fastening means being movable toward the shoe into upper fastening position, a member positively connected to said overlaying and fastening` means to move said means toward the shoe and operative by continued movement to actuate the fastening means for fastening the upper, and a device controlled by the shoe for interrupting the positive connection between said member and the overlaying and fastening` means at a point in the inward movement of said means determined by the shoe to release said operating member for continued movement to actuate the fastening means.

4:1. In a machine of the class described, the combination with shoe positioning means, of overlaying and fastening s including fastener driving means mounted for movement toward the shoe into upper fastening position, positively controlled means for locking said fastener driving means against driving movement as said overlaying and fastening means moves toward the shoe, and a device position-od by the shoe for releasing said locking mechanism from positive control at a predctcrn'iined point iu the inward movement of the ovcrlaying and fastening means.

e2. In a machine of the class described. the combination with means for pulling au upper over a last, of means 'if-ar ovcrlayiugr and fastening' the margin of the upper.r .said overleving and fastening means being movable innf'ardly to upper fastening position. operating` mechanism for imparting inward movement to said ovcrlaying and fastening! means comprising a connection arraujajed to give way when said means has arrived at a predetermined position relatively to thc shoe to cause the actuation ofthe "nisteuincl n mus in response to continued movemeutof said mechanism, and supplemental yielding means arranged to act automatically to hold said over-layin;` and fasteningr means from outward return movement during such continued movement of the opeintirgr mechanism.

el. In a machine of the lars described. the combination with means `for pulling aii upper over a last, of an arm mounted to swing inwardly toward the shoe and haviiur overlaying` means and fastener' drivin' means thereon. mechanism for swingingY said arm Vlon/'ard the shoe5 said mechanism `bolus,r operative by continued moven'ient after the arm has arrived in i'nedetermined relation to the shoe to release the fastener drivin;r means, and a supplemental device automati-l cally operative to hold said arm yieldingly against outward return movement as the fastener drivin(Y means is thus released.

In a machine ofthe class described. the combination with means for pulling :in/upper over a last, of an arm mounted to swing inwardly toward the shoe and havin` overlaying means and fastener drivin;r1 means thereon, operating mechanism -for swinging said arm toward the sh'oc. said mechanism being operative by continued movement after the arm has arrived in predetermined relation to the shoe to release the fastener drivmg` meansj and a spring directed inwardly against the outer face of said arm and arranged to be subjected to stress bv the continued movement of said operating mechanism to hold the arm against outward return movement when the fastener drivingy means is thus released. l

In testimony whereof i, have signed mv name to this specification. *Y u ERIC A. HOLMGREN.

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