US2414549A - Crankshaft twisting machine - Google Patents

Description

n 21,1947. A. k. NOWAK 2,414,549

CRANKSHAFI' TWISTING MACHINE I Filed Jan. 29, 1944 10 Sheets-Sheet 1,

Jan. 21, 1947.

A. K. NOWAK 4 2,414,549 CRANKSI-IAFT TWISTING MACHINE l0 Sheets-Sheet 2 Filed Jan. 29, 1944 a 0 W 1 Z V f Jan. 21, 1947. A. K. NOWAK CRANKS HAFT TWIS'I'ING MACHINE l0 Sheets-Sheet 3 Filed Jan. 29, 1944 Jan. 21, 1947. A. K. NOWAK CRANKSHAFT TWISTING MACHINE 7 Filed Jan. 29, 1944 10' Shegts-Sheet 5 Jan. 21, 1947 A, K' 2,414,549

CRAN KSHAFT TWI STING MACHINE Jan. 21, 1947.

A. K. NOWAK ORANKSHAFT TWISTING MACHINE Filed Jan. 29, 1944' 10 Sheets-Sheet 8 I J l I l l Jan. 21, 1947.

A. K. NOWAK I 2,414,549

CRANKSHAFT TWISTING MACHINE Filed Jan. 29, 1944 10 Sheetg-Shee't 9 v Jan. 21, 1947. A. K. NOWAK 2,414,549

CRANKSHAFT TWISTING MACHINE Filed Jan 29, 1844 Patented Jan. 21, 1947 UNITED STATES PATENT OFFICE 2,414,549 CRANKSHAFT TWISTING MACHINE Alois K. Nowak, Evanston, 11]., assignor to Clearmg Machine Corporati poration of Illinois Application January 29, 1944, Serial No.

14 Claims.

In the manufacture of crankshafts for engines, with multiple throws crankshaft.

It is one of the objects of the present invention to provide an improved machine which will opdistortion of the various parts.

A further object is to or rotating the twisting clamps to impart the desired shape to the shaft.

A further object is to provide improved means for opening and closing the clamps, and improved means for ejecting the shaft from the clamps after they have been opened.

A further object is to provide an improved machine of this character, embodying upper and claimed and shown in the accompanying drawings illustrating this invention, in which Figure 1 is a front elevation of a machine of this character, constructed in accordance with the principles of this invention.

Figure 2 is a diagrammatic illustration of the machine.

Figure 3 is a top plan view of the lower portions of the holding and twisting dies, theupper dies being removed.

on, Chicago, 111., a cor- Figure 41s a front elevation of the parts shown in Figure 3.

Figure 5 is an irregular sectional view, enlarged scale, taken on line 55, Figure 1.

Figure 6 is a detail vertical sectional view,

Fig. 14 is an enlarged detail sectional view taken on line Fig. 15 is crank has been twisted thereby.

Fig. 16 is a detail sectional view similar to Fig. 15, of another of the twister members.

Fig. 17 is an enlarged detail sectional View showing the ejector mechanism and some of the twisting and holding members in section.

slide 23, all as of press.

Mounted upon the bed of the press are stationary holding dies or members 29, any number of which may be provided, according to the size and shape of the shaft to arable members.

Two of the die members 29 (see particularly Fig 3) are positioned to support the two end bearing pins 30 of the crankshaft, and the other two die members 29 are positioned therebetween so as to clamp and hold intermediate portions 3| of the crankshaft. These holding members 29 are adjustably supported upon the bed by means of fastening bolts 32 operating in slots 33.

Mounted upon/the slide 23" (seefparticularly Fig. 14) are the holding'members 34, which are also adjustably supported upon the slide by means 35. These upper members 34 are so positioned that when the slide is of suitable fastening bolts lowered, they will engage the co-operating members 29 to constitute the holdingmeans ing the portions of the shaft positioned therein from rotation, the abutting faces of these members being interlocked, as shownattfig and care ried by the members 29, 34 are suitable dies 31,

Intermediate these holding members-29'; and mounted upon the bediof the machine, preferablylsupported rbyrollers 3% .=(seeparticular1y;Figs. 15 and 16), are members 39 constituting portions of i .twisters. In. the. present exemplification of this inventic,n,.. three of '1 these .members. 33 .1 are shown; and; the intermediatemembers 39..may be of a. size to. engage andzclamp; thedouble crank portions 3110f theshaft.

. Mounted upon the. s1lde';23 aIIe twister members 49 which, co.-..op,erate,,with. the .members 39; and thesemembers 4&1, are rotatably. mountedin any desired or suitable manner, such .aszby means of guidesor tracks 4,! (see particularly- Figs.. 13 and 1'7) which in turn are adjustably mountedjupon helslidezby msanscirastenine b s devices These guides 4i c iveflaneesJlf-ipnthe members.

ilsso st re mitofr at on, of t e mem ers and, at the same time, hold themembers inposion. wi h r s ect othc lide: on raised. and lowd ztih51i6- hemem ersdfl on theslide ee per i h. e. e ect v. members ar-s pported bathe rd a d when theshde. isl were -t aus he; embe 2; to; ntact he: p ti membersfiei uit b esi rwhichare r ed by he s ect ve. emb rsfliz lger p nothe portion of the shaft 35;; The twistersthus formed i li Ql ;.ff he aforesaid. n r t n. be adapted h ld n s.

members 39, 40 to rotate together, the abutting faces of the; members maybe undercut, as at 45; to

cause the two members- 0f; the twister-i to rotate Y,

o ether nysuitable meansmay. be provided for rotating w i s b as mrle ancief e m a embodies actuator member tt, 41, one arranged adjacent the, front and the other. adjacent the rear of'thepress bed.- Theseactuator members 45,

41am pivotally mounted, by their ends, upon pivot pinss ldiwhich ,aline with the center line of the dies ,.on..the bed. (see,Figs. 3 and. 5), andtheblns are-.- mounted. in suitable supporting brackets. Eachofthe.actuator members. two pistons 49,, 5El which respectively. operate; in cylinders 51,52(seeparticularlyFigs z and 6) the cylinders 5 lgbeingpivotally mounted upon the bed,las. at 53.,iwhilethe cylinders. 52 are pivotallymounted'on the bed, as at 54. v

Fluidlpressurehi supplied to the cylinders 52 beneaththe pistons therein, by means of erupply pipe 55, .to raise thepistons and thereby swing the, respective actuator, members 46, 41 about theirpivot to causethe twister membersthat are. l attached, thereto to rotate in one. direction,

for'hold rrqterrmevement w h esp to. he embers 2 S ,3 3, an d inorder; to cause the 7 46, 41 is linked to those whichlare,connectedfto the actuatonme the opposite direction,

,permitthe racks 5| to be 4, to be described) rotating in the opposite direc tion from the twister members which are connected to the actuator member 41 at the back of the machine. This rotation will be imparted to the twister members when the slide is down and when the co-operating members of the twisters are in contact with each other.

After the shaft has been twisted (in a, manner to be described), and when the slide is raised to separate the twisting members and also to separate the holding members, fluid pressure will be admitted -into the cylinders 5| at the top of the pistons, to move them downwardly and thereby rotatethaattached members of the twisters in v e or to their normal position. At the same time, fluid pressure will be exhausted frorn the cylinders 52. The twister members 39 which are connected to the actuator member 45 are-adjustably secured thereto, a at 56, (see particularly Fig. 16) so that they may be adjusted lengthwisdoithe axis of; the;shaf t and positioned iniaccordance. with .theicranks of theshait";- while thetwister. members l 39;"1which are. intermediate the. end twister members; andywhich' are. operated.

by the .actuator'memb er 41.. at the back of the machine, aresecured to the latter.

The. dies may. be securediin: positionin the.re-. holder members in. .an'yisuit-.

spective twister and ablemanner, such asby means oifastening members 51';(seeparticularly Fig. 12) x which a are, re;-

cessed lu -the facespf the.respectivemembers. and

project over; the dies,. beingz anchored ,by of; suitable anchor; bolts. or (see particularly Fig, 12)

Any suitable meansmay; be providedifor, imparting-a rotary motion to one, of thetwister embers whe the c .op.er t ngv mem r arenotinengagement,.and tothat end there may be'provided .a plurality of cylinders 59; which are.

sup ort d by. e slide 23 and.areadiusta lewi h the twister-members. One, of these cylinders, is preferably provided for-each of the ,twister members, and operating a istQn.. hiQh-is onne t d; with apistonr cl anal-thes pistorrrods, in turn each carries a rack member; 5 l eci oca l n a.- uita i e-way '52 (see particularly-Fig, 4). engages. a series of, teeth 53,011 one of the members; of each of the twister-s, so'that when fluid pressure is admitted-to the cylinders ,59 through 5 4 p the piston will be -fi drres u su p p mo d-in the: cylinder, and the. gear and rack ere rsi see direc o n .-th. P e en orm-9f the invention, t c linder and piston mechanism is arranged -so (that twoof the twistenmembers will be rotated in one directionbymoving the respective racks-6i forwardly from the position shown in Fig. 15, and one .is arranged so, as to rotate the twister mentbersin the opposite direction, or from the position howneinFig. 15. The operationof these racks.5.l;.may. be, automatically controlled by meansof ,anautomatically operated valve mechanisrnli5, shown diagrammatically in Fig. 2, and" which valveimechani-sm maybe, in turn, actuated by means of a cam orprojection 65 carried by the slid 23, .so. that the slide-reaches a predeterminedposition in the cycleof its operation, and as shown in Fig 2 the valve mechanism 55 willbeopened to admit fluid pressure from the supply line 61, and when the slide movessothat the valre 65 willshut off the source ofsupply of fluid, pressure, the exhaust 63 will bea opened-to fasteningv devices. 58-.

thereof in therespective cylinders is Each of the racks ction fil -fifii willrotate the twister memmoved ntithenr esitcpins at the ends of the direction by the respective actuating members 46-41.

Q When the slide is lowered so as to move the clamp members of the twisters and holders into co-operative relation, the actuator members will be swung about their pivots by means of fluid pressure being admitted into the cylinders 52 (see Fig. 2), and as the upper twister member 40 will be rotated by the lower fluid pressure member under the influence of the actuators 4641, and as the exhaust 68 of the cylinders 59 will be open, the rotation of the twister members will not be interfered with. This operation will occur when the slide is down and the shaft is being clamped.

After the forged shaft has been placed into the lower twisting members and the lower holding members, and the slide is lowered, this operation of the twisters will twist the crankshafts to their proper relative angular positions. Subsequently thereto, the slide is raised while the twisters are in their rotated positions, that is, in the positions shown in Figs. 15 and 16. That is, the two outer crank pins will have been twisted in one direction, while the intermediate twisters will twist their crank pins in the opposite direction, while the position of the central crank pins will remain unchanged. This will place the crank pins angularly in the desired positions around the bearing shaft, which have remained in perfect alinement. All of the dies will then be in a position which fits the twisted crankshaft, and, as before stated, by having them slightly undercut in the required places, the upper dies can be stripped off and the crank shaft lifted from the lower dies. At the instant when the actuator members reach the limit of their movement, the slide 23 Will start its upstroke, while the upper and lower dies remain in their twisted positions.

In order to limit the movement of the actuator members 4641, and. consequently the degree of rotation of the twister members, pins or projections 69 (see particularly Figs. 1 and '7 to 9) are provided on the slide 23, which are adjustably secured to the slide, preferably by being screwed thereinto, and are held in their adjusted position with respect to the slide by means of suitable ,nutsor collars 10. These pins are so positioned that they will be engaged by shouldered portions H on the respective actuator members 46-41 (see Figs. '7 and 8), and therefore will limit the degree of pivotal movement of the actuator members as well as the extent of rotation of the twisters. Therefore, in order to vary such degree of throw, the pins or projections 69 may be adjusted, and, by so doing, the extent of throw of the actuator members may be varied. Before the actuator members are moved about their pivots 48, the slide 23 will have descended and the holders and twisters will be closed, and the pins or projections 69 will be positioned with respect to the bed. members, swinging about their pivots, will be limited in their movements by the contact of the portions H of the actuator members with such pins or projections.

After the shaft has been twisted in the manner Just described, and when the slide is raised so as to open the twisting and holding members,

the shaft, in its completed shape, may be ejected from the lower twister and holder members. To accomplish this there is provided an ejector mechanism which may be of any suitable con- 'struction, but preferably embodies a bar or member 12 (see particularly Figs. 2, 13 and 14), which After this operation the actuator is mounted within the bed of the press and has connected to it, preferably at the ends thereof, rods 13, on the ends of which rods are provided pistons 14 that operate in cylinders 15, the cylinders in turn being supported in any suitable manner, such as by means of supports 16 secured to the slide 23, so as to move with the slide. The bar or member 12 is of sufficient weight to cause the same to drop by gravity, moving the pistons 14 in the cylinders 15.

Spring operated catch members 71 are provided which project into the cylinders 15, and these catch members 11 have connected thereto pistons 18 operable in cylinders 19. The lower face of each of the catch members 11 is beveled, and the upper face of the piston 14 is also beveled, as at 80. The normal position of the bar or member 12 is such that the pistons 14 will be below the catch members 17 when the slide 23 is elevated, and before the operation of the press. When the slide 23 is lowered to close the holding and twisting members, and as the pistons 14 are at the lower end of the cylinders 15, as'the cylinders are lowered with the slide, the beveled surface of the pistons 14 will engage the beveled face of the catch members 17, so that the catch pass beneath the piston heads 14 as the pistons 14 move to the upper end of the cylinders 15, With the parts in this position, and when the slide 23 is raised, the bar or member 72.wi11 remain in its lowered position by rea son of gravity. However, when the slide 23 and the cylinders 15 are then raised, the catchmembers, being beneath the piston heads 14, will eventually engage under. the piston heads, and before the slide 23 reaches the limit of its upward movement. When the catch members 11 do engage under the pistons 14, a further raising movement of the slide 23 will cause the bar or member 12 to be raised. This will also raise ejector pins 81 which rest thereon and which are provided with ejector heads 82, causing the latter. to engage the shaft 30 and raise it from the lower open holding and twisting members, after manner (not shown). A suitable pin 83 (see Fig. 14), which operates in a, slot 84 in the ejector pins, may be provided to prevent the ejector pins from rotating.

After the shaft has been thus ejected,.and in order to permit the bar or member 72 and the ejector pins to return to their normal positions by gravity, and independently with respect to the movement of the slide, pistons diagrammatically represented at 18 are provided. Fluid pressure is admitted into the cylinders 19 on one side of the pistons 18 through the supply pipes 85, and operates upon the pistons and moves them backwardly against the stress of their holding springs, together with the pistons. The catch members "will then be moved out of engagement with the pistons 14, thereby allowing the bar or member 12 to drop by gravity. This unlocking means for the ejector bar or member 12 is preferably controlled by means of a suitable manual control 86 which may be of any desired construction, such as an ordinary hand-operated valve, and as shown diagrammatically in Fig. 2 of the drawings.

It is thought that the operation of this twisting mechanism will be clearly understood from the foregoing specification, but, briefly stated, it is as follows:

One member of each of the twisters is connected to one of the actuator members in such a manner that the actuator member in front of the press will rotate its respective twister memala-me 7; bers $ifi-One direQtiOn} whiletheactuaton memberin the: back-:- of the a press willirotate its twister member; in the-oppositedirection. The members of the: twistersand holders --are so constructed that the rotation of the respective lower' mem bars will rotate-theuppermembers when they are closed; and'- during the-cperation of twisting the cranks .on: the shaft. When; however; the slide is raised and thetwis'ter an'd hold'erme'mbers are separated so as to permit ejection ofthe shaft, suchoperation will be performed when the twisters are! in their twistingposition, that is,- the position which they assume after-the cranks have beentwisted or formed. However, after theejection; thelowermembers oi the twisters are rotated* back to their norfm'al positions, so that they will behorizontal, and them;- per, twister members, through' the mediumof the rack andgear construction; will be'irotated back totheir normal or--hoi'iaontahpositions; so I that Whenthe slide is lowered after anew shaft has been placed in the lower members 'of the twisters andholders; the upper twister and-holder members will move into co-operating relation with the respective lower 'memberst'o'clamp the shaft. The twister-members will then be-rotated-in the mannerialready described.

Withthis construction, it-will be manifest that asthe pressure requirements upon the twisting cylinders 52and -'5l increase, the pressureupon the clamping" or holding cylinders" will also be increased: automatically; It :will also be manifest that theejectingmechanism will normally: be inactive',,and. that-during the cycle'of operationjof th machine, and when; the slide reaches a predeterminedpointin the 'CYGIGJOf its return movement; the ejecting mechanism. will" be automatically locked to'the slide; toz'be "rendered "active thereby. Thereafter, the, ejecti'ngmec'hanism may be released and rendered inoperativefso as to be, returned toiits normalj'inactivepositibn,by gravity, atithewilliof the operator.

While the preferred form ,of, theinventionhas been herein. shown. and described; it is to, beunderstoodith'at various, .changes,,may be ,made in the details oi construction and in the combination and,.arrangement1.of.the several -parts, within the scope .of? the claims, without, departing from the spirit or" this invention.

Whatis claimed as new is:

l. A. crankshaft twisting machine, embodying separable pairs of. co-operatingholding members andtwisting members-,othefmembers of'eachpair being entirely separatefrom-reach other, means common to one of themembers of each pair -for snpporting all of. thelastasaid members.- separately from the, respective co-operating; members, and for bodily opening, and closing movements away from and towards; therespective co-operating members, means operable upon one ofthe: mem; bers of the-twistingpair for rotatingbothtof' them whentheyr are closed, positive means operable upon the other ofethe twist-ingmembers-to rotate it in the: opposite: direction when-thmtwisting members are separated, and, means-for;- ejecting thershait:v when they-respective co,-operating:holdingandtwisting members are separated;

2, A crankshaft twisting machine embodying separable pairs ofco-operating holding members and twisting members, means common. to one. of the members of each pair for opening-and" closing them, meansoperableupon one of the members of the-twisting; pair for: rotating ,bothof them when they are-closed, means; operable upon the other 02. the twisting: membersrtorrotate: itrin the opposite-direction--when=thetwisting members are separated, ejecting means for ejecting the shaft when the respective co-operating holding and twisting members are separated, and means re sponsi-veto the operation of thefirst recited means -fr= rendering the said ejecting-'means active ata predetermined time" inthe cycle of operatioh'of the first 'said means: 1

35- A crankshafttwisting machin embodying separable pairs of co-operating holding-members and twisting members, meanscommon to one of the members- 0f each pair foropeningandmlosing them; means operable upon one of the members of the twisting pair for rotating both of them when they are closed, means operable upon the other oi the-twisting= members to rotate -it in the opposite direction when thetwisting members are separated, ejecting means-ior'ejectingthe shaft when the respective co-operating holding and twistingmembers areseparated', means-are sponsiveto the operation ofthe first =recited meansfOrrendering the said; ejecting; means active at a" predetermined time-in the cycle 'of operation of thefirst; said means, and means operable" at will for releasing the said ejectin means, wherebythe latter will be; rendered inactive.

4? A crankshaft twisting machine embodying a plurality ofseparable pairs of (so-operating holding members and aplurality of pairsof twisting members, themembersoieachpair being entirely separate from each otherymeans common to'one ofthe members of each pairgfor supporting all of the 'last said 'membersseparately rrom the respective co-operating-members; and for bodily opening and" closing movements away from and towards the respective co-operating members, means operable upon oneofthe members" of" each of the twisting pairsiorrotating both members of each pair whentheyare closed, meansindividual to andioperabl'e upon the'other of each ofthe twisting membersto rotate the respecti've members the opposite direction when thetwisting members'are separated," andmeans for'ej'e'ctingthe shaft when the holding and'twist:

ing lm'emb'ers are separat'edi 5; A.crankshaftjtwistingLmachine embodyingia plurality of separable. pairs of co-oper-ating, ,holdjing members and a plurality. of'pairsi offtwisti'ng members, themembers .of ,eachpair being entirely separate from eachother, means common .to one ofi'the. members of; each pair, forv supporting, all of the lastfsaidmembers. separately from there-v spective co-operating members, and for" bodily opening and closingrnovements away. from and towards: the.- respective coeoperating members, means operable upon-one of the members ofleach of the twisting pairs 7 for, rotating ,both members of; each pair when they, areclosed;- means:individualto and operable-upon the other of each of the, twisting members to: rotate the :respective members in: the opposite direction 'w-hen; the

- twisting members-are separated,andvmeans ior ingt members are ejecting. theeshaft when theholding and: twistseparated, one 1 of said,- pairs of twisting members being rotatable-in-theopposite direction with respect to another of: said pairs, c Y

6. ,2 A- crankshaft twisting machine embodying; a plurality, ofeseparabler pairsi ofgco-operatingholde ins members-andap lity 0f: pairs'of; twistin members, themembersof eaclnpair; being entirely separate; from each other; means commonz toaone orthe memberssof; eacmpainiorsnnnorti g; 11:..oi thesilastfsaidj: memberstseparatelyr from; the re;

' holding and twisting 9 spective co-operating members, and for bodily opening and closing movements away from and towards the respective co-operating members, means operable upon one of the members of each of the twisting pairs for rotating both members of each pair when they are closed, means individual to and operable upon the other of each of the twisting members to rotate the respective members in the opposite direction when the twisting members are separated, means for ejecting the shaft when the holding and twisting members are separated, and fluid pressure actuated means for controlling the operation of said holding and twisting members.

7. A crankshaft twisting machine embodying separable pairs of holding members and twisting members, the members of each pair being entirely separate from each other, means common to one of the members of each pair for supporting all of the last said members separately from the respective co-operating members, and for bodily opening and closing movements away from and towards the respective co-operating members, means operable upon one of the members of the twisting pair for rotating both members of the pair when they are closed, positive means individual to and operable upon the other member of the respective pairs of twisting members to rotate them in the opposite direction when the members are separated, means mounting the twisting members for lateral adjustment, and ejecting means for ejecting the shaft from the members when they are respectively separated,

8. A crankshaft twisting machine embodying separable pairs of holding members and twisting members, means common to one of the members of the pairs of twisting members for open ing and closing them, means operable upon one of the members of the twisting pair for rotating both members of the pair when they are closed, means embodying gear and rack mechanism operable upon the other member of the respective pairs of twisting members to rotate them in the opposite direction when the twisting members are separated, fluid pressure means for controlling the operation of the gear and rack mechanism, means mounting the twisting members for lateral adjustment, and ejecting means for ejecting the shaft from the holding and twisting members when they are respectively separated.

9. A shaft twisting machine embodying pairs of co-operating holding members and twisting members, a slide upon which one member of each pair is mounted, means for actuating the slide to bring the said members mounted thereon into co-operating relation with the other members of the respective pairs, a pivotally mounted actuating member connected with one of the members of the twisting pairs, fluid actuated means for swinging the said actuating member about its pivot to rotate both of the members of the twisting pairs when they are in contact with each other, means individual to one member of each pair of twisting members to rotate them in the opposite direction when the members of the pairs are separated, means for ejecting the shaft when the pairs of members are separated, means for moving said actuating member about its pivot in the opposite direction, and spaced stops for limiting the extent of rotation of said twisting members in both directions, one of said stops being carried by said slide.

10. A crankshaft twisting machine embodying pairs of co-operating holding and twisting memfor ejecting the bers, a slide upon which one member of each pair of twisting members is rotatably mounted, means for actuating the slide to bring the members thereon into co-operating relation with the other members of the respective pairs, a pivotally mounted actuating member, fluid pressure means for operating said actuating member to rotate the co-operating members of the twisters when they are closed, fluid pressure means individual to the twister members that are on the slide for rotating them when the twister members are separated. fluid pressure means for rotating the other of the'twister members in the opposite direction when the twister members are separated, means shaft when all of said co-operating holding and. co-operating twisting members are separated, and means for automatically controlling the operation of all of the said fluid pres-' sure means.

11. A crankshaft twisting machine embodying pairs of co-operating holding and twisting members, a slide upon which one member of each pair of twisting members is rotatably mounted, means for actuating the thereon into co-operating relation with the other members of the respective pairs, a pivotally mounted actuating member, fluid pressure means for operating said actuating member to rotate the co-operating members of the twisters when they are closed, fluid pressure means individual to the twister members that are on the slide for rotating them when the twister members are separated, fluid pressure means for rotating the other of the twister members in the opposite direction when the twister members are separated, means for ejecting the shaft when all of said co-operat ing holding and co-operating twisting members are separated, means for automatically controlling the operation of all of the said fluid pressure means, and spaced stops one for limiting the rotation of the twister members in each direction, one of said stops being responsive to its movement into and out of operative position, to the movement of the said slide.

12. A shaft twisting machine embodying co-operating pairs of holding members and twisting members, a slide, one of the members of each of said pairs being movable with the slide into and out of operative relation with respect to the other co-operating member, means for rotating one of the twisting members of each pair when they are closed, to rotate the other member of the respective pairs, an ejector for ejecting the shaft when said holding and twisting members are open, means for actuating said ejector, the last said means embodying co-operating elements, one of which is connected to the slide and the other to the ejector, said elements being relatively movable during a predetermined portion of the movement of the slide, means operating, when the slide has reached a predetermined position in its movement, to automatically lock said elements together, whereby the slide will actuate-the ejector, and means for unlocking said elements whereby the ejector will be free to move independently of the slide.

13. A shaft twisting machine embodying cooperating pairs of holding members and twisting members, a slide, one of the members of each of said pairs being movable with the slide into and out of operative relation with respect to the other co-operating member, means for rotating one of the twisting members of each pair when they are closed, to rotate the other member of the respective pairs, an ejector for ejecting the shaft when slide to bring the members 511 said holding "and twisting .members are 013.811; meansh'iormactuating tsaid ejector, the last said means embodying =.coeoper.ating elements, one of which is. connected .to .theslide and theto'ther to the ejector, said elementsibeingcrelatively movablelduringflal predetermine'dtipontion of the movementiof .theslidameans operating, when -the slide has reached. a predetermined, positionin. its-.movemerit, to .,automatically look i said elements tog'ether,. whereby {the slide will actuate the ejector, means jlfor unlocking said :elements whereby the teje'ctor 'lwilllbe adapted .to move independentiy with ;.respect ;to said .s1ide,.:and;fluid ,pressure meansifor .mirnparting thelclast vnecited .movementtothafiimtor.

' 114-5!)nmiikshaft. twlstilj fmfiichiile embodying a;s1 ide, sena1tah1e,pairs.dfiholding :and twisting membersnmeans :common tonne,hoftitheimembers meansalso operatingLto vrotate :oneof the twister members ,of the .pair in ,its opposite direction when the members. of tthet pairs .are open, and means for rotating the .othersmembers of the pairs of wtwistersvin the iopposites direction when thetwistingmembersaneopen.

' .K. :NOWAK.

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