US2228748A - Combined feeding and cold drawing mechanism for heading machines and the like - Google Patents

Description

3' Sheets-Sheet l R mi .m u. wn l m r -3 e .nl nl B f1@ e l JIJ-.-1111/4-111 l e L 711% r. li

Jan. 14, 1941.

N CDNDINED FEEDING AND coLD DRAWING MEcHANIsN FOR HEADING MACHINES AND THE LIKE L. BERKEBII'.v

original Filed Jun'e 27,1958

Jan- 1.4, 1941- LBERKEBN. '2,228,748

COMBINED FEED'ING' AND oLDDRAwmG MECHANISM Fon HEADING MACHINES lAND THE LIKE Originl Fil-ed June 27, 19258 3 Sheets-Sheet 2 2:7. Y y INVENTOR Lee Berk/617,

ATTORNEYS K D )during the forward movement of the head N the rearward, thereby wedging' the same vto tightlyresistance or loadr will tend to draw the jaws grip 'the stock.` .;.Qn--the other hand, when the the forward endsof. the jaws-will` hold the same in frictional engagement with; thestock.' A spline'. *N'I extending vertically and engaging spline ways l in the jaws N4 hold the'same in algnmentwhile.;

Q3. aridlQ5-together with their shafts Q and Q* permitting movement toward or from each other.

. There are also bushings Na and N9 in the sliding head N for guiding thenstocis passing therethrough.

thereof. This die member, as shown in Figure 8,

4is mounted to permit a slightflongtudinal move- ,meri t".tl`1`ereof against frictional resisimncei,r `For "this ypurpose the die. isy surrounded by`an annu.-v lar `niemb`r1 '0 .which` is xed in the v'forward wall of the section LfffAlfriction shoe O3 `.extending through av recess `in the annular Vme'mbei-LO' bears against the dieO, and a spring@4 f places atensiori on the shoe. This tension may penned by anzaujusnng scrragfo=i .whih'bars againstthefollower O? .forming an. abutment for spring.; To the sliding movement Sof thefdiefwithili the annual member O screws "O". extend through threadedfapertures in the rear wau o8 o fftiie section L into proximity to the die, andthesescrews may be i adjusted to "obtainthe desiredamount of movement.

'.fThe feeder N being forward of the die O,l it

obvious that some additional means must be Ylio lprovidedto advance. the forward endv of 'the stock `through thefdie before it cany be engaged by said`feeder. For this pur'pose I` have provided i a, second. feeder Pfwhichds substantially .the

L sa'nie in .constructionfas the feederv N ,and, therefore, .will not bedeseribed in detail. l This second rfeeder-is actuated by the feeder N .through vthe medium ofv rods P.4 Theforwardends of thesekrods.,threade'cily',.engage the head1 N and extend rearwardv therefromfthro'ughlapertures in the IwalisQOfand 0k in to-the scti on L2 -of the frame L. ,'Iherearfendsoflthese rodsare also threaded Mandfrhai/ef eigedjherewith fcorrespondingly v threaded sleeves -Pwhich form vshoulders [that .,maybeadjustedinto;differentlpositions; A screw vjP3... engaging the, :rear portion `ofthe sleeve 'P1 and bearing against thei rod P'. .ser ve s to lock ment :The rodsgri aiso, pass through channels .inlthfeederj Pfand. springs P* sleeved on the" 'o5 is'shown in v1"igure s '7 and .1i andfcomprisesa rods forward ofthe lf eederIP'. yieldably press said feeder rearwardtoward the limiting stops formed by the sleeves P@ There? i s ,ho wever, provision forV holding thefeeder P forwardagainst the tencrankarm Q mounted on a shaft Q"- `.which is journaledina vside. piate1.of the feeder, anda pinion-"Q2 on. .theV shaft intermeshes with the sion... The gearwheel-Q3 is up'on a shaft Q4 also Athe pinion will be caused. tjo.tr i."v el}A along the rack Q carrying with it the feeder P. If the 'or tneraek Q6.v When'iit is desired to throw the feeder into actionthe `cam Q" is disengaged ametercorresponding to that of the stock before @Si to produce thereguired amount yof frictionv Thisfis greaterthan the friction of the feeder movement of the crank is sufiicient the feeder lwill be moved completely out of the path ofthe sleeves P2 and may be locked in this position by a camV lever Q7 engaging anotchQa in the top from the Inotch Qa whereupon the tension. of` the springs P4 will return the member `P to its Lnormal position. The "reciprocation of the rods .P and v slieeves .P2 'lwill then correspondin'glyre- 'ciprocatetheifeeder P.` The crankv handle Q is detachable `from the shaft Q', but the gears Q.

willbeloscillatedduring the reciprocation of the ,feeder, P. 4It is sometimes desirable to limit the i :stroke-ofthe feeder P Whichis accomplished by The intermediate section L';.holds the die'mem'- ber O through which the stock is passed to slight; 1y reduce the'diameter'and finish the surface` afstopfscrewgQ secured to the frame .L at its rear yend and Jadjustable into the path of the feeder.'v l

' The feeder P when thrown into operationmay fbe used forpadvanoing they stock .through the die O and intoengagenent, witnthe forward feeder N. However,- before' this" is done itis'convenient toseparate the jaws of the' rear feeder against" s the, closing tension .of ,thelsprlngs Ns so that the4 stock fniay. be easilyv inserted by hand ithere' t betweeh.-,f; 'rhis f is' accmpnshed by. ,the'f-nieciianism" illustrated, in ligr'esd, 5 and 6, `a' nd` 'the' same construction maybe applied to bothfthe feedersN and?, but onthev former for 'emerlf'irig a"stub shaft'Rf is mounted'on one of the'side lacam portion Rf contactinglwith a roller R5 on a "sleeve R which latter carries the bushing N9. Thus, by rotating the gear-wheel`1=t` .the rack .bar"'can, bejmfoved into a v'position where .the sleeve'Rfwili contact with the rear ends@ offliof the 33W ,members .N1 movingl them 'forward partsl` intrus" positionjunui the stock nasjben insertedthrough thefjaws. As shown inFi'gure 2j this adjustment means is on the front side off the .head N and isprovidedwithl an operating -handl'e` R"''for actuating ther same.v A similar 5 mechanism 'is' placed on the back `side. of the member P, being operated bya handle QR.'

'I'he bushingsN'arid N9 forthe feederN may ,the rear end of said plate. rack'bar"'has `35 be` selectedwith respect to, the diameter of stock to bepassedfther'ethmugh, and similar 'bushings if,

are provided forv the feeder P 'which are of 'a diit' passesthrqugnthesihg' uie'o. `stili,amither bushing Sismounted atthe rear end of theframe and intogoperative'relationto the iawsfofftl'ie rear fe`e`der.' P.-,.` During the initial' operation` of mechanism'shown in Figure 3, comprising ashoe S on one side of the stock-'and a cam shoe S. on the` other vside of the stock 4actuated by a.v spring jawswhenmoved rearward over the stock so that the latter remains'stationary until the jawsagain grip"r the..same' for A:a A succeeding ,step forward.

The shoe S2 .is only'left in' this positionzduring the feeding of the stock throughr .the sizing die Oy 75 t L :and the sto'clg ifs first fed through. thislbu'sliingg the feeder. P; itl .is necessary to hold 'the stockl '-.froni moving'jrearward when the feeder moves yin this direction; This function is performed by the "o after which the-frictionof the latter willbesufdcient to hold itfrom rearward movement, and

the cam shoe'S2 can be thrown out of action by a handle S4 yforrotating thesame.-V As soon as .the spring S3 passes thecenter of the -cam, ,i ts

tension will act to hold the Vca rn in this position. It sometimes happens that ya.l section of vstock ,will bebentorfouled in the machine, and-it is necessary to withdraw -itbefore themachlne can `be .further operated@` .The high Afriction of the portion of the stock whichvis in engagement with the sizing die Q would render it diicult to` withdraw it from the diev by hand power..v lIvhave, therefore, provided a means oflockingv the jaws of the-feederP upon the stock passing therebetween, so `that they will clamp the stock` even. when the feeder is moved in a rearward direction.

This locking meanscomprises Screws?5 which threadedly engage the forward end-ofthe mem? ber P and adapted to be adjusted against theforward end .of the vjaws to forcethe same rearward until they firmly clampthe stock. zThis clamping is effected when the feeder P has been adjustedtoits forward position, as shown in Figure 1, wherethe cam Q'I locks it to the rack 4bar Q6. This cam may then be releasedandthe crankrhandle Q erledigen?.v with the shaft Q' and rotated in -the `direction to move the feeder P rearward. Ifthe amount vof movement lis not sufiicient to completely withdraw the stock from the, die O the screws P5 may be adjusted to release the jawsy 'while the member P is again moved forward by the crank handle Q, after which the Lscrews P5 are again adjusted to clamp the jaws andthe member Pis again drawnk rearward. 'In

this way fouled stocky can easily beextracted from the machine. When a stock bar is fed forward to :the ypoint where itsrear'end disengages from the sizing die O, it will berelieved from the friction of Vthis die. It then becomes necessary to provdeother means than the friction of the die LOto hold` the stock bar from rearward movement v,when theV feeder N'moves in this direction. Adevice for this purpose is shown in Figures Land 9- and y comprises a ,splity bushingk T arranged forward ofthe feeder andY held in position inthe frame IL by a screw vT. A second screw. Tengagingthe split portion of the bushing is revoluble by means of a handle VT3 to contract said bushing and to piacethedesired friction on .the stock. Thus, the forwardzfeeding of the stockk cancontinue until its rear end disengages from the forward feeder N, after which it is Astill fed forward by 7 4, 5 and 6, so as' to move the jaws of the feeder forward and to permit the same to separate suiiiciently for the insertion of the end of the stock bar. The handle R9 is then turned into tits normalpositionfwhich permits .the jaws to grip the stock bar and to feed it forward in successive steps. However; the friction device, illustrated-in Figure 3, is adjusted intothe position shown inV saidiigure where it will hold. the stock bar from required number of reciprocations of the feeder P` feeder... n Y

The atngllpport ofthe .frameA L `by ythe' vPvtfll llink' L4 pernflitsA any, night movementthe stock willbe'advanced into engagement f with the die oy and tnenforeea through the v latter. The friction, device Sz'can: then-be adjusted into its inoperative position shown in Fig- `ure 3, and the friction ofthe die O depended upon .for holding the stock againstv rearwardmovement otherl than that permittedvbythe movement ofi `lthefdie'against the stops O". The forward advancementby. vthe rear federis continued until the forward en'dof` the stockbar which has been sizedlby .the die vOy comes into operative engage-L ment with. the forward vfeeder N. The rear feeder maythen be'thrown out of `,action by adjustment ofthemechanismshown in Figures ljand 7, the

. crank handle' Q l being1 engaged withV the/.shaft Q' fand the latter revolved totransmit motion tothe pinion Q5l Q ausingz it to` travel forward on the rackj Q6. At the end ofthis movement thercam leverfQFI is engaged withA the notch-Qiwhichwill 20 hold lthe ,feeder P-forwardand-v infits inoperative DOSitivOn- Thus', While the .forward feedsrNcon- .tinuesto reciprocate and moves vwithit thefrods Pfand sleeves`P2, thelatte'r vdonot come yin convft'act with `the 4member-P.` jAt. .the same `time the `handle R9 is thrown forward, locking thejjawslof therear chuck open, thus preventingv them from wearing out.

-- When therearend ofy astock bar'passes beryond thedie 0,'.the friction clamp T shown, in

Ffigure 9 is used to'holdfthe bar from rearward movement during thersucceedingsteps kof the remove a portion ofythe'stock bar-from` the machineflthis can beaccomplishedfas previously described, b y yadjusting the fscrews 'P5 yand clamp- .inggthe jaws-of lthe rear feed member P, after j which the crank handle Q Vandmechanism. oper-- ated therebycanbe actuatedto withdrawn the stock vin a rearward direction. The rear Vfeeder 'Pjiwhensnot in :usefor advancing the stock lstillperformsthe. function of straightening the rod las it isfdrawn :therethrough by the-forward thereof occasioned by@ .theI stresses to whichrit is subjectedwhle maintaining`A a rigid lconnection 'with ,the-mainframe or-bedA. 1

j --When the stock is being: advanced by the rear feeder it` is .l necessarylto :support the portion Ywhich is. between the Vfeeder and the die, so as to avoidbending or bucklingzof the same. Thisis accomplished: by supporting sleeves or bushings f surrounding-the stock and `as shown in Figure 2,

thereiisxa longsleeve W attached `to the rear wallof the section L and extending forward into vproximity to ythe:A die- O, but leaving sumcient clearance foi-:the floating movement of said die. There isI also afshorter bushing W. at rthe forward end of the.V feeder P which 'extends into proximity to the forward ends v of the grippingjaws. lThere is,.howev`er, one portion of the stock materially reduce the rigidity, but with smaller stock. for instance one-half inch in diameter',

there Amight be dangerv of.. buckling.- Toy avoid Qsuch `objection Lthe stroke of .the rear feeder may moving rearward withthe Lfeeder P.` .Afterf the be diminished-asmuch asdesired, by means yof the adjustment screw Q9.- This forms a stop u the "amount offflearaiicejcan be' reduced to the desired degree.y When?sucht-adjustment is-eifected, f the steek` "will v be advanced. b`y` Vthe :rear feeder in short steps; sothatithe unsupported portion i will'be relatively `short in lengthi 1 What'I claimlas-my inventionjis:

` 1. In a machinevoffthe cha ac frfdescribed,

means Afor advancirigthefstocl; lcomprising a reciprocatory member; stock'grippingf-jaws carf ri`ed1by said member'and having 'awedge engagement therewith,"'resilientfmeans at one'end "of f saidj jaws for 'urging said -jawsA rearward' into said wedge engagement," andfirieans, carried-:by v fsaidi reciprocatory nienibera't the -other I endr of said jaws for y'moving' 'said jawsforward A and therebetween.`

"ciprocatoryf-niember, stock''gripping' jaws car- "ried'by -said memberand'having a-wedg'e erigagef ment'V therewith, resilient means inad'va'nc'e of )said jaws for urging said jaws-v rearward into said wedge engagement,"and "meansffor releasing said jaws for the insertion of the stock therebetween comprising a sleeveisurrounding'u the stock yin rear of 'said jaws,an d means on `said 'recpro'catory member for." moving said ,"'sleeve forwarda'gainst said fjaws'." I

3. In a 'machine' of the character described, means foradvancinglthestocln' comprising a re- `ciprocato'ry member,4 stock' gripping jawsibar- 'nedby said'memb ,and having a wedge engagement therewith,l resilient means. fori urging said jaws rear-Ward into'fsaid'lwedge engagement," and A'means for releasing'saidjaws for th'einsertionA r'of the stock therebetween"cniprisinga'sleeve `surrounding the 'stock'in--rear` of lsaid jaws, agear 'wheel' mounted en* said rreciprocatory member,

a'ra'clr'V engaging said gear wheel"Y and"`nfovable thereby transversely Aof' said f member, a `handle for rotating said Vgear-,sand a cani` carried-by 1 'said rack'uopera'tivelyi engaging'fsaid jslee've to f (Inove'the same forwardffagainsti said jaws rocating head having'spaceddnclinedjupper and lower portions forming wedge; surfaces, *clamp- 'ing jaws betweensaid wedge surfaces and 'having inclined portions-'substantially' parallel -to the inclined surfaces f offxthe head, 'i anti-friction means between said lparallel portions Ispring vmeans within 'thehead at oneen'dof `said jaws for moving said .jaws 'relative to said wedge surrfaces to operative clamping position, andgmeans carried by said head'at the other end of said jaws fork moving said V'jaws relative to said wedge surfaces tofinonerativcv 'position itc permit' the. easy insertion `of` stocky between saidfjaws. f

5. In amachines of the characterfdescribed,

'me'ansy for advancing stockfcomprisingla recip- -rocating'head having spaced inclined; upper and lowerA portions forming wedgesurfaces, clamping jaws betweensaid'wedge,surfaces land havinginclinded portions .substantially .parallel-1 :to the inclined surfaces ofthe headaantiefriction means rwithin the head in advance vof said jaws for/movbetween said parallel "portions, spring means K' 'ingr said jaws relative to saidwe'dge surfacesf'to of stock between4 saidnjawsincluding a sleeve for stock in"` rear of jsai'dA4 jaws,` and Vmeans carried by said head fdr rnovingl saidsleefve against said jaws. "f S11' .w

Y 6;?"In"a machine ofi-the" character described. .5 vmeans for advancing 'stock 'comprising' a recipro- Y,

cating head "having spaced inclinedupper and Y' ing? said jaws relative to said wedge `surfaces to operativeclaxnping position, and meansffor'fr'xiov.- 15

ing said 'jaws 'relative-to said wedge `'surfaces to inoperative position to permit .the-'easy insertion 'of stock Vbetween said j aws including-- a 'sleeve'l for andhaving`r a fwedge engagemeht'v-therewith, resilient means'for' urging said'jaws in'to said wedge engagement, and means "io'r releasing ,saidV jaws 30 l from said wedge engagement," including la sleeve engageable with said jaws, ya.- slidable rack having 'a cam for'actuating vsaid sleeve, andl a'g'e'ar for actuating said rack. "ffl f 18. lIn a machinefof theclassfdescribed,"means 35 -foradvancingthesto'ck comprising'a reciprocating headystock gripping jaws carried by said head` and having a wedge engagement therewith',lresil ient means for urging said jawslin-to saidwedge '-ngagement, and means for"relea'sing said jaws v'from' said wedge engagement,` including slidable1 u "means substantiallyin'axial alignment and en- 'fgageable' with an 'end of |said jaws, andmeans for factuating' said" slidable l` `means including a "member-slidable'atf'substantially right angles to 45 -said-slidable means. l

9;'In agmachineof the classdescribed'rmeans for advancing the stock'comprising `a yreciprocat- :ing' head, vstock grippingj'aws carriedby'-` said head and having a wedge'engagementftherewith. 50 'resilient means'.` for urgingsaidjawsvinto`saidi, vfwedge engagement, and means for-releasing saidV "jaws from said wedge engagement, including a'V -gear carried byy said"head,a'l rack r'actuable by said gear and having'fa cam portion, and a sleeve 55 for; the stockactuable by said cam portio'na'g'ainst 10. In a machine of the `class desc'irib'edvl stock advancing mechanismV including a reciprocating head having Yspaced* inclinedportions. forming 00 wedgesurfaces, work-engaging jaws between said 5,

wedge surfaces and having inclined portions sub-` stantially parallelto the inclinedsurfaces of the head, .anti-friction means fbetweenpsaid parallel f portions, yieldable means at one lend of the'jaws 65 for mcving thejaws relative tothewedge surfaces to operativev clampingposition, and means for-,moving the jaws lagainst the yieldable means so-that workmay be inserted'by\hand"therebe tween, including a longitudinally movableV mem- 70 v,ber at thelother, end of, the jaivfvs.-.and means. forfv .moving-said member ltoward ksaid yieldable means.

V11. In a machine cf the class described, a stock advancing mechanism. including aireciprocating v headfhaving @spaced inclined iportins forming 75K.

2,228,748. wedge surfaces, work-engaging jaws between saidwedge surfacesand having inclined portions substantiallyparallel to' the inclined surfaces ofthe head, anti-frictionl means between `said .parallel portions, yieldabl'e means .at one end of `the jaws for moving thejaws., relative ,tol the wedge .sur-

12. Ina machine of the yclass described', agst'ock advancing` mechanism.. including .a reciprocating head 'having spaced inclined portions forming wedge surfaces, .work-engaging jaws between said wedge surfaces and having-inclined;portions sub.`

stantially parallel '..to the inclined f surfaces; of :the head, anti-friction means between., said parallel portions, yieldable meansat one .end ofthe jawsv for moving thejaws relative tothe wedge surfaces. to operative clamping position, .andymean's for moving the'jaws against theyeldable means so that work maybe insertedby hand therebetween,A including a bushing for 'the work-at thegother endl of the jaws, and a, sleeve Afor said bushingiengag'eable with said jaws. Y

13. In-a machine of the-class described,.,a stock: advancing .mechanism including; awreciprocating head having spaced inclined portionsV forming. wedge surfaces, work-engaging jawsbetween said wedge surfacesand having inclinedportions `substantially parallel to lthe. inclined Surfaces. of theportions, yieldable means at one endofjthe `jaws for movingthe jaws relative tothewedge surfacesto .operative clamping position, and ymeans x for moving the ljaws against the. yieldable means so that wor-k may be inserted by hand therebetween, including a tubular work-receiving mem.- ber at the other end therewith.

14. Inarnachine of the class described, a stock advancing mechanism. including. a reciprocating, head having spaced inclined portions forming wedge surfaces,` work-engaging jjaws between said wedgel surfaces and having inclined portions subfstantiallyv parallel .tothe inclined vsurfaces of fthe. head, lanti-'friction. means between. said .parallel l portions, yieldable means at one end of thejaws for moving the jaws. relative to thel v vedgef` surfaces to operativeclamping position, andfineans for moving the jaws against the yieldableineans'-v so/ that workmay be inserted `by hand therebetween, including abushing forv work at the oth er end of said jaws, a sleeve for said .bushing engage-Y able with saidjaws, and actuatingmeansfor the sleeve including a longitudinallyinovable member having a cam' portion,'and a projection'on the sleevefengagingf said cam portion.V

In a machine of the class described, a stool;` advancing mechanism including` a'freoiprocating head having spaced inclined portions forming wedgesurfaces, work-engaging jaws between said wedge surfacesand havingin'clined portions subvstantiallyparallel to the inclinedlsurfacesof `the head, antifriction means between. said parallel portions, yieldable means at one end of the jaws for moving the jaws relative to the wedge surf facestooperative clamping position, and means*V form'oving the jaws against theyieldable means so v that workmay be insertedby hand therebetween, including a longitudinally .movable tubuf lai" member at thefrother ,end of 'and' engageablev with the jaws,la`nd actuating means 4for 'the tu'- of said jaws and en gageablej u .-1`,6".-'In a machine of th'e'flclass described,":a stock wedgejsurfaces, work-engaging. jaws between4 said wedgefsurfa'ces and/having inclined portions' substantially parallel toA the inclined: surfaces .of

the head, antifriction means between said parallel portions,yieldableI means -at one end iof'the jaws forv moving the jaws relative to .the .wedge sur` faces tof operative clamping position,v and means'.

bular Ymember including a cani, and a]projeczti'onA on' the tubular memberengagingsaidcam. f

advancing mechanismfincluding a reciprocating head having.y spacedf inclined" portions forming for movingfthe jaws'again'st the'yieldable meansv 1 so that work maybe inserted -by 'hand' therebetween, including a .longitudinallyimovable mem# Vber at `the other end'of-Jand engageablefwith saidjaws,y aprojection on' said .rnember-,acam'em gagin-g the projection; and meansfor moving said 17. In a machine of the class described, ya. 'stock' head having. spaced inclined portions `farming 2o advancing mechanism including a reciprocating wedge surfaces, work-engagingV .jaws between said wedge surfaces i. and f having inclinedlporf tions Vsubstantially yparallel `to the inclined 'surfaces of thehead, antifriction means between Vsaid 'parallelportionsl yieldable. means at one end of v the "1jaws for #moving .the jaws relative to...th

rwedgesurfacesto operative. clamping position, 'A

and means for moving 'thev jaws against theyfeldablelmeans'so thatwork may be inserted -by hand therebetween-.including. a longitudinally movable'fr'nember at the. with said jaws'..A 1118,' In amachine of the class described, a stock advancing mechanism including areciprocatin'g headfh'aving spaced inclined portions forming other end of fandsengageablevv wedgeffsurfac'es, work-engaging. jawsv between said wedge surfaces and having inclined 'portions substantially parallel tothe inclined sur-` faces of the'hea'd, anti'friction'me'ans betweensaid' par-allelfportions, ryieldable means' at one end of "'.thejawsffor` moving the jaws;` relative to the wedge surfaces to operativa clamping. position,V

and means for moving the vjaws against the *yield-i able means so thatwo'rk may lne-inserted .by hand therebetween, including a'lon'gitudinally mol/able` .membe'rattheotherend of said jaws, and means fpmving said member'toward'saidfiieldablv 56.'

.means including .a longitudinally movable". rack -havinga cam v"portion, a projection-onfth'lon-rl `v I gitudinally movable memberengaging said am portion, and a manually operable gear meshing 11,9. In a machine-fof 'thel dass' described, a stock advancing mechanism :including af reciprocating head=having spa'cedfinclined portions forming wedge .-surfaces, worlgfengagaing jaws between said" wedge 'surfaces 'and having inclined portions." Y

' substantially parallel vtol the inclined surfaces of tliehead, antifriction means b etweensai'd'vpari allel portions,.yieldable means at fone endo'fthe 'jaws for moving `the'*jawsrelativeI tothewedge f surfaces4 to operative -clamping position," and' means for moving the jaws'ag-ainstthe yieldable means so that" work may be'inserted byhand therebetween, l including 'a longitudinally movabiem'ember atthepthefnd of said jaws, fand, meansfforA x `nov ing,saidV member toward said yield,

able ,means including aflongitudinally movable` rackV having a cam .portion andl a notch, anda l projection on the longitudinally movable mein-' Pv ber engageablelwiththe cam portionftornovethe 3 longitudinally movable member. and engageablei 75 ,vwi'snthe notch 1:0 hold minedposition. r

n Qi; said jaws l .to fhold the work 'gagainst vrearward l 20. In 1 a :machine vof` ztliefclass; described,l recip; rocating r"jaws for feeding the :workgforwardlyf andy means operable;y during Atheyzinitial operation,

movement wheny vthe jaws `inolve 4vrearjvvard,iin; cluding- Opposed:y work-engaging shoes,v .one be.- ing;;adjus`talz le1relative;l tot the;- worky, the. other being a cam,` and.; actuating means ;.for the lcam shoej vincludingaflspringicapable vofl exertingy through -the teamnshoe i upon the work4 `axgreater force than, that.A exerted by. the jaws; upon `the workkl, t v` l f advancinggi mechanism .incfludinlgwja reciprocating.

head ":having` .spaced :inclinedportionsl :for-ming" f wedgeftssurfaceapf work-engaging Ljaws Lbetween y l s .aidwedge fsurfacesrandihaving inclinediportions the head, :antifrictongmeans between said parsubstantially parallel to the inclinedrsuri'aces ,of

alle1p0rtions, means' for lockingzthe; jaws upon the stock' passingtherebetweentincluding .screws with the, :jaws at one'f endthereof. n

i threadedly engagingv `th'e head1 and "engageable' 22. In a: machine of the classjdescribedlza stock advancing*v mechanism including f. lay-reciprocating.

- head -having spaced f inclinedportionsnformingj wedge surfaces, workfengagingijaws between saidwedge surfaces and havinglinclinedportionsvsubQ 'stantiallyr parallel tothel inclined ,surfaces ofl` the thejawsgat ,one; end Athereon.,andtfrneans .sleeved on said screws and'poperable wheny the;

headi 'anti-'frictionalmeana between :said parallel; portions;vv meansffor lockingxtlie 'jawsupon the' st'ock` passing t-herebetween includingl screws threadedly engaging the head and :engageablefz latter -arevreleased for moving-the jaws relative sition.;

Y l 23;' In'amachineifthe` 'advancing mechanismv including 1areciprocating head;having-spaced inclined portiensffermingf Stantiallylearllel t0. the ixicind Surfaes 91th.@

Wedgasurfaes;work-engaging jaws betw'ensaid* WedeefsllrfaceS-.and havngfinclinedonortions S1112-,`

head; antnftionffmeans; between' Saidfharallel portionsyeldable, means ateniese@ Of; the-Jaws fer moving the Jaws. relative.. t0: the-,.wedsesub faces to operatiyegclamping, position, andvmeans,

"'- holding, "the bushing position', and 5 a handle'. ,actuated srew l,earl-led byV the fra'm'e and.` engagingI the split 'portion of me' bushing, said last;

. niention'ed'sc'rew .being adapted "toco'ritract thev split portinof rthevbushin'g upon the stock. ,Y 25,.;Ii`1 a' inachinepfthe class described, ,astoclr` advancing mechanism" including af reciprocating head having'ffspaced inclined A,pi'crrtions forming Wdg'e ,surfaes".v` wdrkfenga'gng jaws 'between Saifd' wedgesurfaces and shavingl inclinedpc'nitions' subf stantrauy parsing; `to tneineljinedsdirfaes ofthev head; antnfrictior; means between'l ssidpara'uei ffrfk 'mbvi'rig the jaws4 relstivegte ,the5 wedge( sur# rele-S4samenzwering: www we .eee-S@ e also carried byjfthe, ;frame"1 foi yliolzzli'fg*th against rearward-inovementfwhen the feedingj e 'forrnovingy the jaws against the 4yieldable,means so :thatawork vmay be Iinsertediby handltherebe- 26. InA av niaehine' :ofl'the fire-f ciprocating( .j aws; for -feeding Athe workforwardly.

of: said jaws A toA holdf--thej Work-against rearward 5 movement when; the jaws Vmove rearward, includ-A: g

ingeopposedlwork-engagingshoes,,one;beingsadi y.

cam-:and means for''act'.,uatin'gthe 'cam:shQein--g` v justable relative to,A the work; the other@ being Vav cluding lineans capable' of a exerting" through the cam-shoeupon the .work :azgreater Afarce. than that ekertedbyftheljawsuponlthe work. -:4 15

27.*;'In-amachineof-,theclassdescribedyalstock G, advaneingmechanism.includinga reciprofcatmg;4 head lhaving "spaced .'.inclinedportionsy forming Y l wedgesurfacesQiworlieengagirig.jaws1betweerrsaid' i wedge surfacesa'nd'v having inclined-portions sub-'f' stantially parallel tothe inclined surfacesof said' ,Y

f headVanti-lfiction meansfbetweenfsaid parallel ,l portions; 'ad'meansf carriedi'by the 'headand-'enf gageable fwithl one end @of the' jaws 1 for Vlocking' thejawszupnf 'the sto'ek'pass'ing therehetweenl 1:23,` lIny a-machineleof the'class described, means s* Y forl'advancing 'the f stock 'including a' reciprocatl ing headhaving wedge fsurfaces, 'stock gripping thestockpana 'resnientfmean's v'carried fb'yt the ,39 f e f wedge surfaces-vinto clamping-#engagement with' headand-bearingy againstf-one en'd ofthe jaws thetension Yof saidv resilienti-"m'ea'ris'l tot'-f-re'e"liche` v 'reciprocating faces' fOr frnv'ing'` th jaws transversely ofthe lieadffcarryV ng the'. jaws *and having'i wedge lsur of the head, against ori'eeidvof'4r means fniovesl rearwardvl including' "a fr'nember 'oar-,l1 ridbv said frame'forward ofthe feeding nieans; and ,adapted tofvbefcontracted ,uponthe stoe ni ntA arried'by the *frame fer, holdf adjustablel'ele 5l vand means-.operable duringztherinitial ,operationl` so Y tofclarnped positionnagainstf'thej stocktan l. 'an v adjustingslcrew movable jlen'gthwise ofj thej `head of; mateds'wck 'clamping jaws, :i reciprocating,

33. In a machine of the class described, a

vframe, a sizing die carried by said frame, means forfeeding stock relative to thedie, and'rmeans'` also carriedvby` the frame for holding the stock against rearward movement When'the feeding means moves rearward, including a member carcluding opposedwork-engaging shoes,'one being] i adjustable relativey to the work, and vmeans forl ried by theframe forward of the'feedin'glmeans and having a portion adapted to be contracted;v upon the stock, an adjustable element carried bythe frame for holding said member in posi-l vciprocating jaws for feeding thework forwardly,-

and means operable during the initial operation f of said jaws to hold kthe work againstjrearward movement when the jaws move rearward, `in- 'actuating the other shoe to exert upon thework a greater force thanA that'exerted by the jaws thereon. i

35. In a machine of the class described', a die for sizing stock, a. feeder for moving stock relal' tive to said die, and means operable when the'l stock is relieved of friction of the dieto hold the .stock from rearward movement during rearward movement of the feeder, including a' split bushing,

Vandmanually operablemeans for contracting the 1 bushing upon y.the stock;

36. In a machine ofthe class'described, apair of opposed stock clamping jaws, a reciprocating head carrying the jaWsand having wedge surfaces for moving the jawstransverselyv ofl'the head to clamped position against the stock, and

means threadedly engaging the'head and bearing against-one' end ofthe jaws to hold saidj'aws' wedged-.by saidsurfaces againstthe stock.

37. In a machine of theclass described; a pair of opposed stock clamping Vjaws,` a reciprocatingA head carrying the -jaws and having wedge surfaces for moving the jaws transversely of the head to clamped position against the'stock, 'and' manually operable means adjustablyl engaging'the head and engageable with the jaws at one end thereof for holding said jaws wedged by said sur-k .faces against' the stock. i

-38.- In a machine-.of the classv described, a re` ciproeating head having transversely opposed longitudinally extendingwedge surfaces,a'pair of opposed lstock clamping jawscarried by said` head between and actuable by, said opposed wedge surfacesto clamped position againts the stock, andtwo different means movablelengthwise of the head and bearing against one end'of y the jaws to hold said jaws'wedgedbyvsaid surfaces against the stock, one of said means being operable vto lock the jaws upon the stock.

39. In a machine of the class'described-,mean's for advancing the stock including a reciprocating head having opposed 1ongitudinal1y"extending wedge surfaces, stock gripping jaws carriedA by with the work,v spring vmeans urging the jaws into v'engagementwith the lwedge surfaces, vrand means foi` moving the' jaws-against'the tension of. the n spring means topermit the insertion loi,I y

ment engageable with saidjaws at one endthere-y of, aV roller .carriedbygs'aid element, a. longitudiy nally movable member having-a camp'ortion corrf f tacting saidroller, and manually `operablemeans 1,-' Y

kfor moving saidmember. e

stock, meanscarried by said head: and bearing.,

against Vone end of the jaws to holdsa'id jaws .2 fwedgedby saidsurfacesagainstthe stock, and f i manually'operablemeansfor moving saidjaw's ir i against the action yof vsaid'holding means' to 5 separate the j'aw's for the insertion of 'stock there'. between 4 into engagementwith the'. wedge surfaces, and;`

manuallyoperable means for'moving'the jaws i against 4the tensionofthejspring means to perf.l .L f mit the insertion of stock betweentheiaw's, in. 1 cluding a slidable element` engageable Witl1 `s aid `A l jaws latoneend thereof, a roller carriedbysaid j element, anda longitudinallymovabley member 20 f having acam portion contacting'said roller.

41.1In'a machine of the classdescribed, a re,-

said wedge surfaces into 'grippingA engagement stock between the jaws, including slidable ele-'r A2. `In a machine of theclass described, re-

withthe" vf{ iyr1' spring means 'urging thefjaws/ into engagementwith the'wedge surfaces;- means formovingthe' `j'aWS v''g'airistthev tension of the'` I spring `"means topermit the insertion of stock@ *i v.between the jaws," including a slidable element engageable with said jaws at onejend'thereof, a'-v roller carried.y byl said elemeniza "longitudinally distance in one direction'.

43,; Infai machine of the classdescribed, 'ae- Y, f cipro'cating headl having opposed ywedge. surfaces,`

said` wedge surfacesfintogripping engagement .with the work, spring means 'urging' ther-'jaws into-engagement withthe wedge surfaces, means*` g vfor movinglthe jaws against the tensionj'o'ff the'j workclamping jaws `between and actuable by springmeans to permit the insertionof stock be? .tween .the '.jaws, including a' slidable element" engageable with-said jaws at oneend thereof, [a 1 roller carried'byfsaidjelement,A anda longitudi- 1 vnally `movableimember:having acam portion" f contacting said roller, and jaaguideflbushingfior,v said head between and actuableby saidwedge. Y' surfaces into clamping engagement witirthe` the work carried'bysaidslidableelement. -fpg a'machin'e of the class described, aref s ciprocating head having opposed wedge' surfaces f work clamping jaws `between and 'ac'stuabieg-by` said wedge surfaces into gripping engagement# with the work, springmeans .urging the .jaws` ciprocatin'ghead having opposedwedge surfaces,v worky clamping jaws-between and actuablelby .'35 ciprocating head having opposed wedge surfaces, sV 1 f worklclamping jaws 'between-fand actuable by. `.1 said wedge," surfa`ces` into gripping engagement j i Amovable member. havingacamjportioncontactJ

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