US2364819A - Builder mechanism - Google Patents

Description

Dc. l2, 1944. M- RODDY 2,364,819

BUILDER MECHANIM Filed Feb. 13,l 1941 3 Sheets-Sheet l Dec. 12, 1944,` F. M. RoDDY I BUILDER. MEGHANISM 3 Sheets-Sheet 2 Filed Feb. 13, 1941 lllllllllllllllllllll'llllllllllIll'lllllllllmllllllmlnlm" INVENTOA ,fea/ 1% en/0.?

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Dec. 12, 1944. F. M, RODDY 2,364,819

BUILDER MECHANI SM Filed. Feb. 1s, 1941' s 'sheets-'sheet s 1 ATTORNEYS.

j Patented Dec. 12, 1944 BUILDER. MEcnANlsM Fred M. Roddy, Providence, R. I., 'asslgnor to H a B American Machine Company, a corporationot Maine Applicant; february 13, 1941, serial No. 378,745

claims. (ci. 24a-43.4)

invention 'relates to builder mechanisms. and more particularly to a' builder mechanism for use in textile twisting machinery such as, for example, a large package twisting machine for4 rayon; and has for one of its objects4 the traversing of the packaging-meansI from end to end of the yarn receiver at constant speed during the winding operation.

Another object ofthe invention is to provide a builder mechanism which will raise and lower the ring rail at a constant speed throughout its entire vertical traverse from the top to the bottom ends thereof with no dwell at the terminal extremities of its stroke upon reversal of the direction of traverse of the rail.

Another object of the invention is to provide a builder mechanism for actuating the traversing member of the packaging means in which the stroke or length of traverse of the traversin member will be controlled and lvaried according to a predetermined cycle of operation.

Another object of the invention is the provision v of a builder motion for building .a headless bobbin having a lower main vcylindrical vsection with substantially straight sides down to the bobbin base andan upper top section of sloping formation `the contour of .which will prevent slough'ing-o of the top end convolutions and'yet will permit the wound textile material to be pulled off easily from the upper end of the bobbin.`

Another object of. the invention is to provide a builder mechanism which will actuate the traversing member of the packaging means and will be of a sturdy construction and will run for considerable periods of time without attention.

Another object of the invention is to provide a builder mechanism of extreme flexibility capable of actuating the traversing member of the packagingmeans at high speed through a series of cycles during the building of the bobbin and yet will permit the ready removal and the replacement of the cams controlling the building of jbobbins of desired contour.

ing means in order that the slope of the cam face will be gentle and "reversals of direction easy so that rapid acceleration and difllcult reversal of the traversing member willtherefore be avoided.` z Another object of theinyention is to ,provide a builder mechanism incorporating a main'cam of a generally heart-shaped formation, the con;

tour. of which is a uniformly-advancing spiral for each half of the cam and Vwhose manufacture can be generated mechanically on a machine tool.

thereby obvlating any laying out or designing of the cam contour on a drafting board as is the usual practice with cam shapes of irregular contours. Y

Another object of the invention is the driving by means of simple gearing of the -mechanism which shortens the stroke andthus avoids the use of previous mechanisms using ratchets and pawls or pick motions for actuating the mechariism serving to change thestroke of traverse.

Another object of the` invention is the provision t in association with the main cam mechanism of the builder motion of an auxiliary cam for progressively building the sloping top of a bobbin, and the use of a planetary gear arrangement c0- operating with part ofthe cam mechanism of the main builder mechanism so as to vary the length of the stroke or traverse.

With these and 'other objects in view, thevention consists of certain novel features of construction, as will be more fully described. and particularly pointed out in the appended claims.

Referring now to the drawingswherein like reference characters denote like parts throughout the several views of the accompanying drawr ings, in whichunit, housingmy improved builder mechanism Another object of the vinvention is to provide a builder mechanism which will permitv random doln'g of the bobbins.

Another object of the invention is to provide a builder mechanism which is of a unit construction the parts of which can'be readily. assembled .at a work bench,and also having a compact standardized arrangement which will be univer- Eg. 1 is a side elevation of a portion of a traveler type ring spinning or twisting frame embodying my improvements; r

Fig. 2 is a front elevational view of the builder and showing the main traverse cam. and the creep or auxiliary traverse-control cam in their extreme positions of rotary movement;

Fig. 3 'is a detail sectional view taken on line 3 3 of Fig. 2, showing the arrangement of the main cam, the slides, and the gearing for driving the. Cam;

sal and can b e yplaced in any oi' the usual locations of such mechanisms Iin textile machines .i

and thus will eliminate the use oi' special designs to fit specific types oimachines as heretofore required with the prior arrangements.

Another object of the invention is to provide a Builder mechanism incorporating a cam shaped' j to impart constant-speed reciprocation to the traversing member associated with the packag- Fig-4 is detail sectional Viewy taken on line d 4"-.4 of Fig. 2 showing the arrangement of the creep" caii, `the rocker arm, and the" planetary gearing for driving the "creep cam;

the rocker arm. in dot and dash outline, in its twol extreme positions of oscillatory movement,

and the planetary gearing, in full lines, for drivlng the creep" cam; I

Fig. 6. is an enlarged detail sectional view of part of the builder mechanism shown in Fig.' 4,

Fig. 5 is a fragmentary detail endv elevation view, with thecreep" cam removed. showing vline;

Fig. 9 isan elevational view of one type of 10` bobbin having a yarn package provided with a build for which the mechanism'shwn in the drawings is adapted; and

Fig. 10 is a graphical'l representation of the manner in which the stroke of the traverse rail carrying the packaging means is progressively lengthened and shortened while being traversed up and-down at uniform speed as the yarn or thread is being laid .on the spool whentheA builder mechanism illustrated in the drawings is used.

H eretofore, in the building of bobbins having cylindrical yarn packages provided withI a tapered build at the top, the Superposed layersv of yarn or thread have been laid on the bobbin by Ysuitable packaging means traversed by a travwhich co-acts with a cam follower member carred by afslide to impart uniform reciprocatory motion thereto at all times during rotation of the main cam. To convert this reciprocatory motion of the slide into oscillatory motion, at

constant speed, of a builder .lever operatively connected to a traversing member carrying the packaging means, I providea rocker arm which is actuated by and oscillated in response to the reciprocatory movements lof said slide, and this rocker arm drives a second slide which has parallel mov tion with the lfirst slide and is operatively conersing member actuated by a-builder mechanism I bination of an accelerated traverse' speed and also by a -shortened traverse stroke 'A effected by means of either a ratchet and a pawl mechanism or by a pick mechanism which actuates an eccentric or a screw to effect an intermittent windingup of theliftchain and to elevate, by small inv, crements, the top end level or limit of the stroke of the rail and thus shorten its traverse while keeping the bottom limit of the stroke of traverse gunchanged. Such 'prior mechanisms have several disadvantages, the vprincipal objections being that they lack nexibmty, vare not adapted tonighspeed operation, have lost motion, and sometimes require winding back to their starting position afterldomng 'of the wound bobbin and hence-do not permit random dofdng. Furthermore, the pawls and the ratchets are found to be subject to considerable wear so that not only is 'the life of the mechanism relatively short, but in many instances it requires-frequent attention during its operation. Also, such previous mechanisms do not permit as complete exible control over the shape of build of the yarn or thread at the top of y the bobbin, since'screws and eccentrics are used to vary the'stroke and length of traverse of the traversing member carrying the packaging means. Thus, an aim ofthe present invention is the provision of a simplified and improved builder mechanism for textile packagingappay ratus wherein exact control of the length of stroke of the traversing member vanti the shape of build on a bobbiny is obtained so a's to generate any desired shape ofv build at the top of the nected to an arm on a rocker shaft to oscillate the lever for actuating the traversing mechanism to bring about the desired traversing movements of the traversing member carrying the packaging means such as, for example, the reciprocation of fthe lifting mechanism for raising and :lowering the reciprocating ring rail of a twisting machine for textiles.

iliary cam which I term as the creep cam, and

this cam, although simultaneously going through the same oscillatory movement as the rocker arm with which it is associated, has slight progressive rotational movement relative to the rocker arm and willv make one complete revolution with respect to the rocker arm for a predetermined cycle of complete oscillations thereof vto reciprocate a block on which is rotatably mounted the roller for driving the second slide. Thus, the

creep cam in making one complete revolution on the rocker arm will cause-the block to progressively move radially inwardly and outwardly withrespect to the pivotal axis of the arm to' progressively vary the radial distance of the lever arm of the rocker arm that drives the lower slide from a predetermined minimum up to the length i and which has extending 1ongitudinally between the end frame members li'the xed horizontal spindle `eupporting rails I6, one being disposed at each side of the machine frame, upon which a plurality of vertical twisting spindles generally designated l1 are mounted in the usual manner 'for rotation thereon for carrying and rotating bobbin. In accordance with ,the present invenj, tion such a build on a bobbin can be produced by means of simple'gearing and thereby eliminate in the usual builder motions. vTo this end the present invention contemplates a novel builderA mechanism which embodies two cams arranged fthe ratchets and pawls and pick mechanisms used the yarn receivers or bobbins I8 on which the yarn is to be wound and which may be of either of the types shown in Figs. 8 and 9 respectively. s the yarn 20 is wound upon the receivers or bobbins I8 as itis supplied from a suitable source of supply (not shown),it is directed and guided vthrough the yarn guides 2l which are mounted on the vertically traversable guide rail 22 andy thence passes to the bobbins through the travelers 24 carried on the rings 25 which are secured in` ring holders 26 mounted on a vertically traversable ring rail 21. The ring holders 26 preferably are ofY the' type described and claimed vin my prior Patent No. 2,033,741, granted March l0, 1936, although other known forms of ring holders may be used, if desired. The spindles I1 may be any of theusual individual knee-brake type, and

Since the aforementioned two slides c have parallel motionwith respect to each other the linkage between the rocker arm and the arm on the shaft carrying the lever for reciprocating Q the traversing mechanism is constant which re- I they are provided with the customary whorls 28 for rotating the spindles and the bobbins in unison, and driven by the usual driving bands (not shown) which are rotated from a suitable source of power, such as for example a plurality of pulleys on a power shaft (not shown) that extends longitudinally of the machine, as is a known arrangement in spinning or winding machines.

In order to traverse the ring rail andthe guide rail during the winding operation, each ring rail 21 and each guide vrail 22 is separately mounted upon a plurality of lifter rods 3 0 and 3| respectively, one'of each 0f said lifter rods being shown in the drawings, and the upper ends of the rods 30 and 3| are connected flxedly in a suitable manner to their respective -rails. Mounted on the lower ends` of the rods 30 and 3| are the'shoes 32 and 33 respectively which have a fiat bottom face engaged by the respective rollers 34 and 35 rotatably mounted on a lifting lever 38'. The lift ing lever 36 is fast on one end of a cross shaft 31 which is `journaled in the brackets 38 suitably' atp tached to the inner side of the rails I6 and extends transversely of the machine frame to be rocked by a lever 38 which is fast on the other end of the cross shaft 31 and osclllated by a connecting rod 4D having pivotal connection at its opposite ends with the lever 39 and a builder leverl 4| fast on the end of an oscillatable shaft 42 which projects exteriorly of the housing 44 of the builder unit generally designated 45, the shaft 42 being positively oscillated by the mechanism of the builder motion therein which is to be presently described in greater detail. i

The builder mechanism of the builder unit comprises as the principalegmentg thereoifa main cam 48 of heart-shaped contour which is continuously rotated at uniform speed to eect the recprocation of a slide 39 at a uniform rate of speed, a rocker arm 50 oscillated by the slide .49 in response to its reciprocatory movements, a

reciprocable transfer bar 5| connecting the rocker arm 50 to a rocker lever 52 and reciprocated in response tothe oscillatory movements of the rocker arm to transmit the oscillations of the same to the rocker lever 52 to effect corresponding oscillatory motion of the shaft 42 and the builder lever4| thereon, and an' auxiliary mechanism to control the oscillatory motion of the shaft 42 by varying the' extreme limit of the stroke of the reciprocable transfer bar 5| in one direction comprising an auxiliary cam 54 oscillatable with the rocker arm 50 and valso independently rotatable relative thereto during a definite predetermined cycle of oscillations of the rocker arm for progressively varying the leveragey ratio ofthe connection between the rocker arm 50 and the re ciprocable trlnsfer bar 5|.

As illustrated in Figs. 2 and 3. the heart cam 48 is affixed to the end of the hub 55 of the drive gear 58 in a suitable manner, as by means of the threadedstuds 51 which pass through suitable openings in the cam side and have their inner ends screwed into tight engagement with the tapped holes 58 provided in the end face` of the hub 55. The main cam 48 is rotated continuously at constant speed by the drive gear 5B which is driven, preferably at a relatively slow speed, by the pinion 80 fast to one end of the power shaft 5|. Suitable means may be provided for driving the power shaft 8| at a slow speed from the headV of the'machine, such as for example a speed-reducer unit generally desig.. nated by the numeral 83 the mechanism of which may comprise a worm wheel (not shown) secured on the other end of the shaft v8| and driven by a worm (not shown) fast on the longitudinallvextending shaft 55 which is positively driven'in a manner well understood in the art from the head of the machine. As illustrated in Fig. 3, the gear 55 is provided with a suitable bearing sleeve 88 pressedinto the hub 55 of the gear 55 for rotating of the gear about the fixed pin 81 which has a portion4 68 non-rotatably secured in the hub 10 of the housing 44 in a suitable manner such as, for example, by means of a key or a set screw (not shown) Referring to Figs. 2, 3, and 4, the main cam 48 is shown with its peripheral face in an operative engagement with the periphery of the cam follower roller 1| rotatable on the pin 12 carried by the end portion of the depending arm 13 of the bracket 14 which is offset from and secured to the outer side face of the upper slide 49 near one end thereof in a suitable manner, as by machine screws 15. As shown in Figs. 2, 3, and '1, the upper slide 49 consists of a long, narrow, U-shaped plate providedl with two spaced slotted openings n 'i6 through which extend the shanks of the T-shaped blocks'11 the heads of which are accommodated within the -channel portion of the slide and hold the slide in the channel-way 18 of the horizontally disposed U-shaped guide member 18 for free sliding movement therein. Screws 80 secure the blocks 11 to the back wall of the channel member 19 which in turn is suitably fixed to the housing 44 of the builder unit.-

In order that the reciprocatory motion of the slide 49 may be transferred to the rocker arm 50 to impart oscillatory motion thereto, I pro.

`through the rolling connection. of the roller 8| with the ybracket 14, serves to oscillate the rocker arm 50 back and forthin response to the movement of the slide. f

In order` that this oscillatory motion of the rocker arm 50 may be transmitted by the transferY bar 5| to the rocker lever 52,'1 form the other end' of the rocker arm 50 of a bifureated con'- struction (see Fig. 4) havingithe spaced arms 83', and the outer end of these arms is provided with a rectangular slot 85 within which is mounted the slide block 86 which bridges the arms yand has mounted therein` a cam follower roller 81 freely rotatable on a pin 88. The roller 81 engages ,and rolls back and forth along the outer surface of a-hardened face plate-8l aftlxed to the adjacent end of the transfer bar 5|, thereby imparting reciprocating movement thereto in re sponse to the oscillatory movements of the rocker arm as the roller 81 rolls Aup and down on face plate 89 during oscillatory movement of the rocker arm 50. The transfer bar 5| is held offset from the U-shaped slide 90 by the spaced studsil provided on the back of the bar and the bar is ,iixedly secured to the slide in lany known manner ln the art, such-as by screws 93. The lower slide 90 is of similar construction tothe upper slide 4,9 and is held in the channel-way 85 of 'the 'U-shaped guide member 98 by 'l'- shaped lblocks (not shown) whereby the slide has free sliding movement in the lowery guide `member ss, which in turn is axed te the neusing Il. A

A cam roller pinned to the arm 52 by a pin |0| and freely rotatable thereon contacts the hardened sleeve |02 attached to the transfer bar Thus, the longitudinal'reciprocating motion of the transfer bar 5| will therefore be converted into oscillatory motion ofthe `rocker lever 52 which -is keyed to and oscillates the shaft I2 and through it imparts oscillating mo- Such movement tion to the'bunder lever 4|.

of the builder lever reciprocates the connecting rod 80, oscillates the shaft 31 and the. lever -38 and effects vertical reciprocatory motion of the lifter rods and- 37| to raise and lower the ring' rail 21, and the thread'guide vrail 22 respectively, during winding of the yarn on the bobbins I8.

It will be seen from the description of the l builder motion thus far described that the main cam 88 in normal operation rotates continuously at uniform speed and there will be produced a vertical traversing of the ring rails and guide lrails at constant speedthroughout their traverse `.with no dwell at the ends of the stroke when the direction of traverse is reversed.'

A further feature of this invention resides in the construction and arrangement of the builder motion for changing the length .of traverse of the ring rail in order to produce the long, sloping top Ti or T2 on either of the bobbins I8 as shown in Figs. 8 and 9 respectively, this build being formedby the traversing action of the ring rail of the spinning or twisting machine just described; and to this end I- provide means for 'progressively varying the vertical traverseor stroke of the-ring rail during a predetermined cycle of its opera-v tion. In the illustrated embodiment of the invention, I show an auxiliary cam |05 which I have termedthe creep cam since it isconstructed and arranged to have progressive rotational 'movement relative to the rocker arm and to vary its angular position with respect to the arm 50 by a creeping" action or progressive rotational motion of the cam |05 to progressively move the slide block 88 from one end of the slot 85 to the other end thereof. Thus, I provide ln the inner face of the cam |05 a groove |08 which receives a cam follower roller |08 loosely rotatable upon the pin |04' fixed to the slide block 88. The groove |08 is made of such shape or contour as to vary the` fulcrum length between the reciprocable pin |08', as it moves with the block 88, and the axis about .which the cam |05 rotates, in accordance with' whatever rule-or law according to which the cam |05 must' necessarily move to produce the desired shape of bobbin top. It will thus be seen that by this arrangement I eil'ect a progressively varying change in the leverage ratio of the lever arm 83' or in other words, 'vary' the leverage distance l asoeeie arm 50'carrying the cam'follower 8|, also'upwardly inclined, to the left of the sure. However, when the transfer bar 5| has been re'l ciprocated to the left of the figure and restored to its original starting position., the rocker shaft and the rollers 8| and 81 will all lie on the same vertical line of centers. Thus, the inner or starting position of the transfer bar will always remain the same at the start and finish of each reciprocation. I

In order to impart the progressive rotary or creeping motion of the auxiliary cam |05 during the simultaneous rocking motion of this cam 'and the rocker arm 50, I have provided a system of planetary gearing to turn the cam |05 whereby it will make one rotation on its ownv axis-during the predetermined cycle of oscillations which it undergoes with the rocker' arm 50. In the embodiment-illustrated, the rocker arm 58 ,makes about 48 cycles of oscillation to each revolution of the creep cam |05'. To this end, I mount the oscillatory creep cam` |05 on the reduced portion |08 of the short shaft |01 and securely clamp the cam in place thereon by means of a nut |08 and a washer |08. 'I'he shaft |01 is rotatably mounted in the bearings I|8 and` respectively integral with the channel member 88 and the housing 84 of the builder unit. Mounted intermediate of the bearings ||0an1d I'II is a gear. f

-I I2 which has intermeshingI engagement with the drive gear 58 which.drives,thejmain cam '88. Provided in the outer side faceof the gear ||2 is a large circular recess which forms arim ||5 on this side face of'the gear, and mounted on the inner wall of this recess isa pinion gear I I8 which is freely rotatable on a stud I I1 ilxedly secured by screw threads to a threaded hole in the side wall of the gear ||2 and locked in place by means of a nut I I8 on the projectingthreaded,

end of the stud. The piglnion- I8 has intermeshing engagement with a pair of gears IIB and |20,

' which gears are of substantially 'equal width and slight amount for each cycle of swinging move- -ment with the rocker arm 50, and I utilize this 50. The' other end portion of the pin |25 isv of more reduced size than the end portion-j|28 of the line of contact of the roller 81 with respect t0 the transfer bar 5| by causing the slide block 88 to progressively vary its position and to move up and down inthe slot 85 -and thus advance or retract the roller 81 progressively to vary the outer extreme limit of the stroke of the transfer bar 5| and the slide 90 without altering'the inner l limit or startingposition of the transfer bar 5I. v In other words, the slide and transfer'bar 5| their combined widthsubstantially equalsthat of the pinion I8. As shown in Fig. 4, the gear ||9 is keyed to the shaft |01 by means of a key and forms a small short cylindrical plug |28 which is inserted within a hole |80 formed in, the side face of the gear |20.4 Thus, the pin |28 serves to bridge the gap between the rocker arm 50and the gear |20 to couple these parts together l for oscillatory motionin unison. The gears ||8 and |20, 'while of equal pitchdistrictenl diiler,

however, in their respective number of teeth, the

' gear |20 having one more or one less tooth than the gear H9. In the planetary gear system thus described, it will be observed that the motion of will be moved to their maximum outward position as shownin Figf2, and the rocker arm 50 will `assume the angularlylnclined position there shown, with the upper leverarm 88 of the rociker 18 the gear |/I-9 is dependent upon the revolving motion of the gear 4| I2 and the oscillatory motion of the gear |28. To make this entirely clear, assume for the moment that gear |20 is held stationary. Pinion. I |8, moving with the continuously rotating gear |I2, would simply roll arbund gear |28.

It would at the same time .alsoroll around-gear v H8, but inasmuch as the latter has a dillerent f.

number of teeth than gear' |28, number of 2,301,642, November 10, 1042.

asesora revolutions of the pinion determined by the number of teeth on gear would eiect a partial rotation of gear ||0 relative to gear. |20. Thus this partial rotation ofgear ||9 relative to gear |20 may be said to depend upon the revolving motion of gear ||2, since we have assumed gear |20 to bestationary. Actually, however, through the pin |25, the gear |20 oscillates with the' rocker arm 50 and as it oscillates it affects the rotation of the pinion IIB, causing it to turn slower when the angular movement of the rocker arm is in the same rotational direction as that of gear l|2, or causing the pinion ||6 to turn faster when the angular movements of the rocker arm 50 and the gear I2 are in opposite rotational directions. Since',as before noted, gears |20 and ||9 are both in mesh with the-pinion ||6, any change in the speed of rotation of the latter due. to the oscillatory movement oi.' gear |20 will affect a corresponding y movement of gear I9. Thus the gear ||9 will oscillate backand forth with arm, a reciprocable bar actuated by said element,

and operative connections between said bar and said builder lever for effecting oscillations of said lever and reciprocations of said rail in accordance with the reciprocations of said bar as1 determined by the adjustment of said element.

2. Builder mechanism for reciprocating a rail of a spinning or twisting machine having an osthe rocker arm 50 and will at the Vsame time progressively advance or creep around the reduced portion |06 of the shaft |01 and turn relative to the rocker arm 50 because of the different number of teeth present in the gears ||9 and |20. Since the gear ||9 and the cam |05 are both keyed tothe shaft |01 the creep cam |054 will therefore participate in exactly the same movement as the gear ||9. If desired, it will be obvious that different increments of creepage of 'the oscillatory cam |05 may be obtained as desired by providing various desired tooth differences in the number of teeth on the In building a bobbin having either of lthe shapes shown in either Fig. 8 or Fig. 9, the build ofthe yarn package is accomplished by the use of a variable and cyclic traverse wherein the vertical stroke of the rail 21 is progressively shortened and lengthened in accordance with a predetermined law, governed by the equation of the curve employed for the cam form; and the cycle of shortening and lengthening of the traverse is repeated over and over again, in which the super- Dosed spiraled layers of yarn forming a .multiplicity of zones Z, when the bobbin has been built up to the desired diameter. and nishing points of each yarn windingfor each cycle or .zone always terminate in the same plane, which is that of the. bottom or base of the bobbin. 'I'his is indicated graphically in Fig. 10,

The starting which representation is not intended to be an exact diagram of the winding but is intended to depict only 'ithe repeated cycle of shortening and lengthening -ot the verticall traverse of the ring rail during .the winding vof each half zone .VQZ" f indicated iniFigs. 8 and 9.. 'I'he traverse motion,

ot mybuilder permits random domng of the bobbins since new bobbins may be inserted whenever desired and the winding commenced thereon at any point in the traverse cycle, the yarn wrappings being appliedv in the same cyclic manner when one cycle/has been completed and the point of change ,for next succeeding cycles is to com- This invention insofar as it relates to a mechanical mdvem'ent per se.capable o1' general use in other mechanical combinations than in Y a textile machine embodying a winding device including 'traversing means is described and Serial No. 404,454, tiled vJuly 29, 1941, entitled Mechanical movement,

now Patent No. 7

cillatable builder leverl operatively connected with said rail, means for oscillating said levercomprising a power driven gear continuously rotating at' uniform speed, a cam rotated by said gear, a slide actuated by said cam, a rocker arm actuated at ,one end by said slide and having an element at its other end movable along the arm toward and from its axis of rotation, means including a series of gears operatively connected with said power driven gear for moving said element with respect to said rocker arm, a reciprocable bar actuated byl said element, and

operative connections between said bar and said builder lever for affecting oscillations of said lever and reciprocations of'said rail in accordance with the reciprocations of said bar as determined by the adjustment of said element.

3. Builder mechanism ior'reciprocating a rail of a spinning or .twisting machine having an' oscillatable builder lever operatively connected with said rail, means tor/oscillating said lever comprising a power driven gear, a cam rotatedy 'by said gear, a slide actuated by said cam, a rocker arm actuated at one end by said slide and having an element at its other end movable along the arm toward and from its axis of rotation,

. means including a second cam rotatably mounted on the axis of'said rocker arm for moving said element relative to the said arm, means for oscilciprocations of said rail in accordance with the reciprocations of said bar as determined by the adjustment of'said element.

4. Builderl mechanism as set forth in claim 3 in which the said second cam is moved through one complete revolution with respect to 'said rocker arm for a predetermined cycle of oscillations of said rocker arm.`

5. Builder mechanism as set forth in claim 3 inwhich the end of the rocker arm, its axis, and the said velement come into vertical alignment during each oscillation of the said .arm

.whereby the end of movement of said rail in one direction remains unaffected by the adjustment of said element.

; FRED M` RODDY.

'CERTI'FI'CA'IE oFlcoRREcuoN. Patent Ne; 2,56Lh819. 'December 12, 19ML.

' .FRED Me RoDDY.

It is hereby voeitifiedthat eror appe'a'rs in llzinted specificetion' ofthe above nu'nbe-red patent requiring correction-as follons': Page 5, edcond colnmnrlinee 10 and 11,-c1ulaim 1, etrike out 4'Ithewgards "relative to .the'said ann, means for oscilearm and insert insteaf--toward `'or fifomthe axis of said`ro'cker aI-*m-; and that the said'Ietters-,Ifatentvshoruldbe v read vlvil this 'coireetionthere-in that the seme' may conform to therecod 7 of the case in the Patentv Office. Y

signed end eeeledfth'ie let-day ef Mey, A. D. r19145.

- Leslie Frazer 1 v (Seai) vActing Commissioner of Patente.

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