USRE641E - Improvement in machinery for cutting screws - Google Patents

Description

PATENT OFFICE.

H. A. HARVEY, OF` NEW YORK, N. Y., ASSIGNEE, BY. MESNE ASSIGNMENTS,

OF THOMAS W. HARVEY.'

IMPROVEMENT IN MACHINERY-FOR CUTTING soREyvs.

Speciicationforming part of Letters Patent No. 4,548, dated May 3l), 1846; Reissue No. 64I, dated December 28, 1858.

To all whom it may] concern: I

Be it known that THOMAS W. HARVEY, of the city, county, and State of New York, deceased, did in his life-time invent new and useful Improvements in Machinery for Manufacturing Wood-Screws; andy I do hereby declare that the following is a full, clear, and exact description of the principle or character which distinguishes the said invention from all other, things before known, and of the manner ot' making, constructing, and using ltion as cut open to exhlbit 'sliding rods within them. Figs. 6 and 7 are a section and front view of the chuck and gripping-jaws which hold and rotate thescrewblanks. Fig. 8 is a perspective view ofthe hopper; Fig 9, a section in front of the chasing-tool to exhibit more clearly its connections. Figa/'10 is an elevation of that end of the machine which is on the left side when looking at it from the front. Fig. 11 is a vertical transverse section taken at the line X X of Fig. 2. Fig. 12 is another transverse vertical section taken at the line V V of Fig. 2. Fig 13 is a perspective view of the delivery end of the hopper-rollers and discharging-slide; Fig. 14, a horizontal section of the same, and Fig. 15 la crosssection of the transferring-fingers as opened by a wedge-like projection on the lower end of the conducting tube.

The same letters indicate like parts in all the figures. The first partof the said'invention ofthe said THOMAS W. HARVEY relates to thev method y of arranging. the screw-blanks in a continuous row from a promiscuous mass, that they may be delivered one by one with the heads inLtlIe same direction and without hand labor; und this part of the said invention consists in ,ef fecting the said purpose by Ineens of two iiiolined rollerslplac'ed at, s sumolentndis'tance apart to permit the Shanks of the screwblank's freely to fall and han g between while the heads rest on their periphery, the rotation of one one or both of the said rollers having the effect to aid the screw-blanks'fin arranging themselves, and, in connection with their inclinati'on, to cause them gradually to travel toward the lower or delivery end.`

The second part of the said invention relates to the delivery of the screw blanks automatically from a row and conducting them to that part' of the machine in which they are to be cut; and this part of the said invention consists in combining with the delivery end of the rollers, ways, or any equivalent theres for, a delivery and check slide, and a receiv ing and conducting tube, the delivery and check slide by its vibration performing .the mechanical functions of taking or receiving and delivering the screw-blanks one by one from the row. and at each delivery checking the farther descent or progress of the row, while the receiving and conducting tube performs the functions of receiving each screwblank as delivered and conducting it in the required direction to the place required for the after operations, whatever they may be,

The third part of the said invention relates to-the operation of receiving the screw-blanks one by vone from the cond acting-tube and presenting them to the spindle or mandrel by which they are to be rotated fortheafter operations; and this part of the said invention consists in combining with the conductingtube a transferrer which receives one screw-l blankat a time from theconducting-tube, and

which then carries it off and transfers-it to the mandrel. y

' The fourth part of the said invention relates to the method' of rotating the screw-blank for the threading operation; and consists in combining, .with arotating mandrel or spindle, and

vwith suitable means for holding thescrewblank in line with such spindle or mandrel, a sliding-spring turn-screw toenter the niek of the screw-blank to rotate it against the eutting action of 'the cutter, the spring permitting the turn-screw tol yield when comingin ontactwitli the head ofthe blank I when the nick vis not In line, ,and by its tension forcing theturn-screw into the nick the momentthe lthisV purpose,

nick and turn-screw are the rotation, the object of this being to avoid injuring the shank and head of the blank by gripping-jaws, which, whensuflicentto insure the turning of the blank, generally do injure the shank and head; but the most important object of this part of the invention is toinsure the Vaccurate cutting of the thread. When the blank turnsin thejaws after the commence ment of the threading operation, the .thread must be injured, for the reason that the pitch ofthe thread is always dependent upon the relations of the rotation of the mandrel or spindle and the chasing motion, aud as these are positive, whenever the blank slips or fails to tnrn to that extent the positive relations are disturbed, and the thread must be injured; but by the use of a turn-screw fitting in the nick the blank must be turned with apositive i Amotion, and hence the difficulty abovepointed out cannot occur. With this view a turnscrew was applied for this purpose before the said invention ofthe said THOMAS W. HARVEY butnot with a spring or yielding pressure, and in consequence it could not be applied in screw machinery with an automatic feed, be-

cause there is no automatic feed-motion known which can insert the blank with the nicks always in the same direction; but by the said',

improvement the turn-screw is brought into action without reference to the direction of the nick when the blank is introduced.

The fth part of the said invention relates to the arrangement of the thread-cutter o'l chaser and the sliding rest, the latter of which is secured to a sliding chasing frame or carriage for the purpose of preventing the shank ofthe screw from yielding' while under the action ofthe chaser, which fatter is also properly secured in an adjustable tool-holder or lhead` jointed by its lower end to the chasing' slide frame, the upper end sliding on a rod secured to a sway-bar, one end of which is jointed to an adjusting-slide and the other governed by ascam, which gives the requisite taper and point to the screw. The chasing-l frame' is governed in its motion by a chasingcam groove on a cylinder, the groove being so formedv as to move the chasingslide to carry the cutter gradually from the commencement of the thread toward the point with a motion so regulated relatively to the rotation of the mandrel as tofgive the pitch ofthe thread,

and then 4moved again for another cut, crossing the other for one part of' the gro' and that part of the groove which Amoves the chasing-slide for chasingthe thread is in the form cfa helix, and at the "end thereof it crosses the helix with a sudden.

curve. to run back thc chaser, and at the end of the helix the groove runs. intofanother groove, the junction of these two being provided' with a sliding switch connected with a `slidingrod within the chasing-canil shaft and governed by another cam, called the index-l caln, that when the thread is chased theswitch -is shifted, which opensthislzatttcr` groove-to brought in line-by draw the chasing-frame far enough ont of the way to admit ofthe operation of the transferrer to supply a new blank.

The. sixth part of the said invention relates to the'method of adjusting'the motions of the chaser to `the varying lengths of blanks and to the dil'erent form of points, so as to insure the formation of good points, on the screws by making the cam which governs the .motions of the sway-bar adjustable on its shaft.

'The last part of the said invention relates to the mode of changing the cams that operate the transferrer, the gripping-cam, andthe cllasingcain by means of an index-cam, which operates sliding switches. through the intervention of sliding rods within the hollow man.- drel and the cam-shafts.

In the accompanying drawings, A A represent a bench or platform, which may be extended to any 'desiredlength, dependent on the number of individual machines which are to beplaced ih a line. In Fig. 4 this platform is represented as raised upon the vertical standards A A', through which passes aline shaft, b, on which there is a loose pulley, c c, there being a sliding clutch at d4 to A engage with said pulley. Around this pulley passes a belt, e e, that'extends around the pulley Y onV the spindle W, which carries the screw-holder or chuck V, said screw-holder containing the jaws that hold lthe blanks while being cut. 0n theshaft W isa pinion, Z, which gives motion to the gearing-wheels on the respective spindles. B B is the cast-iron traine-work which supports the principal operating partsof the machine.

F is an inclined hopper, in to which the blanks are thrown promiscuousl'y at the upper end. It is sustained abovethe machine on standards H H, its sides are inclined, and its bottom con-4 sists of twoparallel inclined rollers, E E, forming inclined ways, placed atsnch distances apart as to permit the shanks lc (see Fig. f1) ot' the blanks to han g freely between them,"while' the heads rest on their periphery. These two rollers aregeared together by twosog-wheels, d, and receive a rotary motion 'by a belt, 'b passing around the pulleys i', sonthat by the inclination and the rotation the rollers cause the blanks to arrange themselves in regular order, with the Shanks-k, hanging between thev `rollers and the heads, restingfon their upper inclined surface, and the rotationandinclina:v tion also canse the blanks gradually to de'- scend toward the lower end,;wh sion, they are received one ,Lb

turesmadein two' bars-rxr'see `ig.'13 cfa delivery 'and check slide,"l, which;` being then moved in *thedirection ofthe 'arrow hy the inclination ofthe bars r r tthe aperture, forces the blank th ns received and han gin g vertically' towardand over the vertical tube i', (sec Fig. 12,) made in a projection of one of the stand- -ards H. 4As4 the slide l discharges a blank, its

inner face pre\'ents'the further delivery ofthe blank from, the roller-ways until its l'return'. to receive another.v

ere, in suecesy y'.lhe preferred form of the aperture in the delivery and check slideis repl that runs in a camfgroove, o, cut in the surresented in plan .at Fig.`14, where it will be face of a cylinder,P, on the shaft Q, by which seen that the diagonal aperture in the bars Ar r l the` required movements` are given. The

is enlarged in the parts r' r to 'be of sufficient transferrer is then pushed forward to intro- Acapacity to receive a blank so soon as the ide duce the head of the blank in the end of the upper part of the delivery-tube i and between l1) bya rod, y

runs back from one discharge. The blank is mandrel by means of a lever, e c', (see Fig. 4,) thereheld by the liplike projection until the that turns on a stud-pin, im', its upper end slide is again moved f'orward for tlc delivery. being forked to embrace a pin Zf, connected The bars ofthe slide work in recesses in the with the slide l" (in which turns the arbor.

. and its lowei` end is proit and the end ofthe roller-ways, and its pevided with a cam-pin that runs in acamriodical movements, which must correspond groove, m", (out in the surfaceof a cylinder, O,

with theoperations of otherparts of the maoii shaft Q,) which gives the requisite motion chine, are givenby an arm, j'", jointed toit t0 the lever. After the head of the blank by-alink, j", the arm j being attached to one has been inserted in -the end of the mandrel,

^ end of a rock-shaft, g, which passes through and there held by suitable means, the transwith two sets of bars, i' 'r., to-leave room be- Abut'tlie two are useful to keep the blank verand has its bearings in the hollow shaft i of ferrer retrogrades by the saine movements in one of the intermediate cog-wheels. The other aninverse order to receive another blank.

end of this rock-shaft has another'arm', f, op The form of the cam-grooves o` and m on erated by a cam, X, on the shaft of the indexcylinders O and P is fully represented in cam J, which' makes but one revolution to each Figs. 2 and 4, where it will be seen that these complete operation ofthe machine, and theregrooves run entirely around the cylinders in fore'the position of this cam is such relati'vel y the direction ofthe periphery, and that there tothe indexcam as to deliver one blank for is a lateralgroove, p n, in each, whichruns yeach operation. rlhe arm j" is borneup to the thcreforin diagonally and into it again, face of itsca-mbya spring, h". (See Figs 4and and where they run out, there is .a sliding 11.) The delivery and check slider l' is iliade switch, c', in cylinder o, and a corresponding one, g' in the other, to keep the cam-pin in -the grooves o" m"A to permit the cylinder, to

tween them for. the journals of the two hopper-.- rollers, as the check-face of the slide should be nearly in contact with the end of the rollers. One of 'these bars may be dispensed with operation of chasing the threads onthe sc Aw; but where a new blank is to be supplied t fiese switchesare shifted to close the direct grooves tical as it is moved out over the receiving and andopen the lateral ones to give the required grinding tube. Before a blank is discharged movements .to the levers h and e. This shiftfrom the 'row in the-roller-ways the transferrer ing of the switches is effected in the following a: must he put inposition at the lowerend of manner: The cam-cylinders i) and P are made 'the conduciingtube i'. This transferrera,I has partly hollow to receive the Ysliding switches, a holein it ef sufficient capaci ty to receive the which are connected -by means of cross-levers vend of a screw-blank as it descends,`and a botd' and f' with a sliding rod, b', within the holtom to prevent the blank from descending too low cam-shaft Q, which is slotted for the pasl far andto'prevent he blank from falling ont sage and play of the cross-levers, and this during the operation of transferring. This' sliding rod is connected by means of a swivelhole is made half' and half in the contiguous collar witli-a lever, a', thelower end ot' which ,faces of two blocks, the twoblocks being on turns on a joint-pin and the other end ein- 1.5,) so that when the transferrer is brought to the receiving posi `oii its two'partsm are the blank to dropin freely, and, as it moves the ends of springs w" su", projecting from an braced by a slidin g"c`ollar, y, on the shaft M, arbor,-l. A connected by apiii, z, (see Fig. 5,) with aslid- ()n the lower end of the conducting-tube-11l ing rod, S,.wth'in tlieshaft, which is slotted for there visa small wedge, am, (see Figs. 2` and 'the' play of the pin z, the end of the sliding r'od being connected by a collar, q", with one end of alever, q, that turns on a fulcrum-pin,

" its lower end being made to embrace *forced apart slightly bythe wedgetopermit -trom the conducting-tube to Atransfer the `which the switches are shifted. This cani are closed by the tension of the springs w" :1:l

blank, lin leaving-the wedge the two parts Ymakes but one revolution to each complete operation of the machine, andthe cam-fillet,

to h'old the blankI with sufficient force to pre-- Iveiittfroinaccidentally dropping out. r The' arrow, runs at' right angles to the axis for adapted to movein a. slot, j', of the frame.-

arbor lof Vthe transferrer rocks in a slide, l", the purpose of keeping the diagonal grooves n" closed. At lit takes adiagonal directionl After the blank has been received in the to 4, to open these diagonal grooves, that they transferier, it (the transferrer) is' turned to 'may operate the levers, and during this operbring the blank Ato a horizontal p0sition, ation the index-cam fillet runs in the direcwhicli is effected lby a lever, h', thatturns on a tion of the periphery from 4 to 3, and then it st.ndpin,its u pperend being connected by a takes a diagonal direction back to 2, for the .link 16', with an arm, k', of the rocking-arbor l. its lower end is providedy with afcampiu to close-the grooves pfn".

rotate without moving the levers during L,the

the, fillet ofthe index-cam J on the shaft K, byv

from 2 to 1 in tli'edrection the reverse oi' the purpose of shifting the switches back again The form of the lateral grooves p" u" is as follows :',The groove p in cylinder P is thev one which operates lever h vand the transterrcr m to move the blank from avertical to a horizontal posi-tion. When the switch g is shifted to close the direct groove o, it-runsfrom the direct groove to 1 in an oblique-direction, (as represented by dotted lines in Figs. 4 and.) to changethe blank from theve'rtical toa' horizontal position. At this time .the lever ee begins to pushv the blank .horizontally to introduce it in the mandrel, which motion is elfected by the lateral cani-groeven',l of the cylinder L), that runs diagonally from the switch c to the point 2. (See Figs. 4 and 5.) During this motion, however, it will be obvious, from theconnection of thetransferrerby means of the' arm k with the lever h,'(by which .it is vibrateth) that the horizontal movement would cause it te vib-rateback again in part, and to prevent this the groove on cylinder P runs from l Ato 3 (see Eig. 4) in the'reverse direction to retain the transferrer in a vertical position, and then the grooves'p and n run into the direct grooveby similar angles reversed. The jaws y, that take and hold the blank in line when presented to them by the-transferrer, are three in number and are connected to a chuck, V, on the end of the hollow mandrel NV. The chuck is hollow and has three parallel bars, t, (dividing the circle intothree equal parts,) to which'the` jaws are connected in the following'mannen To the bars 'v are connected'by-ajointpin the levers'. g, the back ends of which are provided with two adj nsti iig-screws, iamone for eachand their for ard ends are jointed by links i to the vjaws g, which are adaptedA to the shank and head of the blanks. lThe jaws run back some distance to form a connection by joint-` pinswith arms on the -end of a rod, o, that passes through and slides within the mandrel' W to forni a connection', bymea'ns of a collar, with a slde,'n, that has a campin, m, operatedib agroove-cam, I, on the shaft M, so ythe ding of this rod o the-jaws crate 1in? he manner of a togglejoi'nt to.

`'closeon orliberate' the screw-blau k. When the jaws are closed, the cam-pin ofthe slide, during the operation of chasing,'runs in that part of cam-groove JI which runs entirely around in the direction ol' the periphery; but when the jaws are to be opened for the pur` pose of discharging a cut screw and to receive a screw-blank a sliding piece, p, is moved in 'the position represented in Fig. l3, which changes the direction ofthe groove and makes it diagonal for a short distance to. open the jaws, that the nished screw may be dis! Y charged, then parallel to hold them -op'en while anotherblank is'` introduced, 'and then ina diagonal direction back again to close "on` the blank. The shifting ot' thesliding piece p to'niake this changeis effected by the indexcam J in the saine manner as the'shit'ting of the switches in the cam groovedfcylinders O l? by connecting the shifting piece p with the rod S, which slides in the shaft M of the cam, the sliding rod' being connectedby a bar, r, with the lever q, operated by the indexcam J, as before described; On that end 'of the slidingv rod o which is connected with the grippers-'there is a tubular cylindrical projection, y', (see Fig. 6,) in which. slides a turnscrew, Z', with projectionsat (the back end that pass through elongated holes in the tube, vand .acted -upon by a helical Aspring on'` the cylindrical -projectiomby which the turn-screw is forced upy against the head of theblank. so that when -t'heblank is intro- "dncedby the transferrer lthe turn-screw is forced back, and, if the neck be not properly presented for its reception, the moment the chaser takesetfect the rotation brings them in line, andthe turn-screwis forced into the'vnick by the tension of the spring, and then the blank is turned by the turn-screw, and the jaws merely hold it in a central direction, which avoids the mutilating of the shank and head by a grip such as is required when rotated by the grip of the jaws alone. Another purpose of the spring on the turnscrew is that the spring, being under tension,

the moment the jaws aresnciently opened to liberate the finished screw it is forced directly ont of the mandrel, thus avoiding the possibility'of a fresh blank being introduced before the finishedscrew is discharged. After the blank has been introduced andthe transferrer has moved ,out of the Way, the chasing operation commences, and it is important during this'operation to support the shank of `theV blank by a rest opposite to the chaser, and therefore, and for this purpose, both the chaser and rest are connected with and4 carried by the sliding carriage N. The carriage N is connected with the back of the frame by means of a bolt, d, that passes through and slides in a slot, e, in lthe frame, and to the end by a cylindrical rod, N, projecting from' it, which slidesin an appropriate box at theJ end of the frame.` The rest c is mountedin a proper manner in a socket in the back of A the carriage to admit of adjustment, and the chaseru, which is opposite lto it, is secured in like manner to an\ adjustable. head,*N!, jointed. to the lower part of thecarriage at-b, and so situatedrelatively to the point of the chaser that a circle struck fromthe center ,of

this joint will intersect' the axis of the blank and the point of the chaser when properly'adjusted. The adjustable head is provided with a swivel-box, y, that slides-0n arod, a", connected` by meansbftwo links, s s, at t t with a sway-bar, U'U, by which the chaser is moved towardV and-from the blank during the operation of chasing the screw; and the carriage receives its motion for chasingandrnnning lback the chaser and rest by means ofa cam-groove, ti-, cut in the surface-of thecylinder L on the shaft M, that carries the cam,

before described, for opening and closing the jaws, and this groove receives a cam-pin attached to ,the carriage.' This groove, from the right angles to the shaft.

' determining the pitch of the thread. At the end of each cut the chaser is run back byyt'he passage of the cam-grcmve from 2 back to l. When the' thread is completed, the carriage, with `its chaser, must be moved out oi. the

f way until the completed screw is discharged and another blank supplied, which is ef'ecte by the lateral cam-groove tr, that runs out div vagonally from the groove t. At 2 and at 3 it takes a direction at right angles to the shaft and vcontinues so,V holding the carriage back until it reaches the point 4, (sce dotted lines, Fig. 4,) where it'runs diagonally back again into groove t, preparatory to another operation. The campin ou the'carriage is made to follow either of these grooves by means of a .sliding switch, t, connected with the sliding rod S in the-camshaft M by a lever, u, (see Fig. 5,) and operated by the index` cam J, as in manner 'fully pointed out in the description of the mode of closing the jaws'.

During the operation ot' chasing the thread, which is done by several successive cuts, the chaser must be drawn back clear of the thread before the carriage can be carried back to commence the next cut. For this purpose it is that the chascrLhead is connected with the swaybar U U', as stated above, and for the further purpose of determining the taper ofthe screw to'be cut oneend of this sway-bar is jointed to a block, w', (see Fig., 1,) that slides in the frame governed by two setscrews, m on opposite sides of the frame, by which the point of the chaser can beadjusted horizontallyT with accuracy during the operation of the machine, and the other end of this sway-bar is provided with a cam-pin, c, that is operated by a camgroove, w, ona transverse shaft, T, driven by bevel cog-wheels on it and the cam-shaft M,

the wheels being of the same diameter to in.

sure the turning of the two by equal motions. The form of this cam-groove, which is cutin the surface of a short cylinder, is from-the point 1 to 2 (in the direction ofl the arrow) in, the form of a regular helix lto more the point of the chaser toward the axis of theblank to give a regular taperto the screw; if it be desired to make the screw'tapering.; but if the screw is to be made cylindrical, or without taper, then this part of thergroove must runat As the chaser approaches theend ofthe screw, the groove runs out of theline of the helix with a sudden curve, to form what is called the gimlet-point. to i he screw, the form of this part of the cam being governed bythe form ot' the intended point of the screw. vFrom this the groove takes a re' versed'diagonal direction to draw the chaser far enough back to clear the'threads when the carriage is run back, the groove running at right angles to the shaft during this motion of the carriage; and, finally, ittakes the'rcverse-d diagonal direction, ru n nin ginto the helical part ofthe groove to recommence the out; but, as

the thread is chased by severall successive cuts, it is necessary that the chaser should, at each successive cut, bc carried the thickness 'of one shaving nearer to the axis ofthe screw. For this purpose the cam slides on its shaft, (which is hollow,) and it is so attached to a sliding t rod, 11 ,within the shaft by means of a feather, rod, or bayonet, ql, that passes at right angles through a slot in the shaft. lThe outer end ot' this rod is connected by a collar with a lever,

m', which turns on a. joint'pin at of", and its lower end is provided with a canrpin, q', attached to it by adjusting-.nuts W, which run in a cam-groove, Y', cut in the vface of a wheel, Ron the shaft K of the index-cam J. The position of .this cam on the shaft, relatively to the indexcam and its form, is suchv(as represented in the drawings) that at the commencez: ment of the operation of chasing a screw the4r cam-pin is nearest the center of the camwheel, and its diameter increases irregularly, so as to move the chaser toward the axis of the screw less for each successive out to give a good iinish to the thread,the last operation bein g rather to clean Athe thread than to cut, and then the cam runs by a more sudden curve 'back to the place of beginning 5 and for the purpose of adjustingthe cam groove w to the length of thread to be cnt its cylinder is made adjustable on the shaft by connecting it with the feather, rod, or bayonet ofthe sliding` rod 12 by the intervention of a circular plate, 8', to which it is attached by screws i that pass through slots in the platein manner well known to mechanical engineers. Motion is vcommunicated to the mandrel YV, and from thisto the other shafts, by a succession of cog-wheels and pinions, as fully represented in the drawings, the direction of the rotation of each being indicated by arrows. It is only necessary in this connection to state that the relative revollu. ions of Athe mandrel and chasing-cam will d end on the diameter, length, and pitch' of the thread to be cut, the relative revolutions ofthe mandrel and chasing-cam and pitch of the chasing-cam, together with the diameter and length of the screw, determining the pitch of. the thread, and the relative revolutions of Y the chasing-cam and index-,cam determining the number of cuts to be given for the complete chasing ofl the screw, it being observed that the indexcam must make but one'revolution to each complete operation.

It will be obvious that the various parts of this machine are susceptible of modifications .without changing the principles of 'thcvsaid invention-as, for instance, the transfo rer can be operated to transfer the blank from he conf. ductor to the mandrel by a different arrangel ment of levers andcams, andinstead of operf4 ating them by means of cams having sliding switches to vadmit of seyeral revolutions to each'complete operation `of the machine, the same end may be` obtained by common cams .making but vone revolution, and the'transf ferrer itself may be differently constructed, so 'lon g as it performs the function assigned to it.

lt will be obvious that s'ome .of these improvements may beemployed without others, and to other branches of the manufacture of screws, but when applied .to threading the best lresults will be obtained when used t'ogether 5 or, for instance, the hopper, roller- Ways, and discharging-slide may be omitted and the blanks supplied to the conductor by hand, and the advantage arising from the use of the conductor and eonveyer retained, for this devicevp'resents a decided advantage for hand or other modes of feeding over all other previously known modes of presenting the blank to the" rotating mandrel, and so with other operations too numerous and not neces-` sary to mention.

What isclaimed as the invention of the said THOMAS W. HARVEY, and desired to be so se cured by Letters Patent, is` y 1 l. The combination and arrangement of two inclined rollers, Vone or both rotating and,

placed at a sufficient distance apart to permit the shanks ofthe blanks to hang therein freely suspended by their' heads, substantially as described, and for the purpose of. arranging the blanks (when presented in a promiscuous jmass) all in a row with their heads up, and

causing the row to travel toward the lower end and tobe delivered `one by one, as set forth. l

2. Combining with the delivery end ofthe inclined rollers or equivalent ways for supplying theblanks. in order, a delivery and check slide,..and Va receiving and conducting tube orv equivalent, therefor, substantially as described, to receive the blanks from the row, deliver them one by one, and conduct them 3. Combining 'with thereceiving 'and con-l ducting tube, substantially as described, a'

transferrer,` or equivalent therefor, substantially such as described, to receive the blanks from the conductor and transfer them to the lmandrel or place Vwhere they are to vbe subjected to the cutting action, as set forth.l

4. Combining vwith 'the mandrel or spindle,l and with suitable meansforholding the screw. blanks in line, substantially as described, a. sliding lturn-screw and spring, or equivalent therefor, substantially as described, and4 for the purposes'set forth. l

5. Governing the motions of the chasser-toward andu from the axis of the blank bycombining the chaser-head with a carriage and sway-bar moved by a cam, substantially as described, and also connecting one end ,of the sway-bar With an adjusting-slide when'thisis combined with the ehaser or ehaser-head, as described, whereby the amount of taper tobe given tothe screw can be regulated at pleas ure. i,

6. Changing the directions of the various cam-grooves by means of sliding switches operated by sliding rods within the hollow camshafts, and shifted by an index cam, by which' the various changes of the motions ofthe machine are effected, substantially as described. 7. Making the cam which operates the sway bar adjustable 'on its shaft, substantially as describedffor the purpose of ladjusting the motions of the chaser to .the length of the blank to insure the proper formation of the Witnesses:

WM', H. BIsHoP, WM. M. INGRAHAM..

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