US1551648A - Engraving machine - Google Patents

Description

W. 5. EATON ENGRAVING MACHINE fw C21/n1 INVENTOR Sept. l,- 1925.`

Filed Mehl, :w22

4 smug-sheet 2 La j ly///Ji ,W1 INI/ElvToR MM/MM ATTORNEY'.

l lrgzse W. S.. EATON ENGRAVING MACHINE Filed DBC. 4, 1922 4-SheetS-l5het 3 .INVENTOR /gV/k ATTORNEY Septv `1, 1925.

W. S. EATON ENGRAVING MACHINE Filed DeC. 4t 1922 4 Sheets-Sheet 4 ll H @Mm ff NVENTOR ATTORNEY.

Patented Sept. 1, 1925.

PATENT oFFicE.

WILLIAM S. EATON,` 0F SAG HARBOR, YORK.

yENGRAVING MACHINE.

Applicationv med December 4, 1922. YSerial` No. 604,650.

To all whom t may concer/n."

Be it known that I, WILLIAM S. EATON, a citizen of the United States, residing at Sag Harbor, in the county of Suffolk and State of New York, have invented certain new and useful Improvements in Engraving Machines, of which the following is a specification, reference being had therein to the accompanying drawings, which form a part thereof.

lilyy invention relates to engraving ma.- chines,.and moreparticularly to a machine of this type adapted to reproduce letters, numbers of characters upon a work plate in the same position as, but on a scale smaller than, in a pattern or master.

` Heretofore engravingnmachines have been ing graduation marks, numbers andlegenols upon panel boards for use upon boxes containing the audions, detectors' and the `amplifying `circuit controls used in and about wireless equipment, or for similar purposes. Upon such panel boards the engraved matter isusually circularly arranged, although some of the legends maybe required to be on a straight line.

To facilitate the completion of such boards, it is essential that the machine have a considerable range in the field of operation ofthe routing attachment, and be capable of quick adjustment so as to permit the. economical engravingof-such boards as tov different, spaced, partsy thereof.

Tith the above. conditionsin mind, I `i I Y Y scale of the reproduction, which will always be smaller thanthe scale of thepattern,

have produced an engraving machine wherein the routing or engraving tool'. and the support vfor the panellboard or like work plate, are capable of such relative movement and adjustment as willy permit the production yupon ,different portions of the board,

of complete legends or scalemarkings, whileYY permittingI theplate holder in .its entirety to be so moved by other adjustments, as to bring different portions of the board Withinthe normal range of operation of the router.

I also so construct the machine as to permit the adjustment kof the portion of the work bed carrying the panel board or other similar work plate, so as to cause, in the reproduction, va circular arrangement of the graduation lines, letters, numeralsor char-v acters, although the different lines, letters, numerals or characters of patterns from whichl such are reproduced, are brought to occupy the same position upon the pattern table, or are arranged vin a straight line upon the pattern table.

In a Vmachine embodying my invention, the router is rotated through the medium of a flexible driveV shaft, the *chuckV for the router being supported by a member connected directly with lthe transmitter arm, the ilexibility of the drive shaft for the chuck and `the router, permitting that `universal movement of the routing tool essen# tial toa .reasonably accurate reproduction of` y different letters, numerals or characters.

The machine is so constructed that the vrouter .is normally supported in a plane above the .panel board or other work plate by supports in themselves movable toward and from the work table, whichk supports are so constructed as to permit vthe necessary free universal movement of the router, upon a single plane, irrespective of the position of the support, while at the'same time permitting movement of the router into and out of engagement with the panels board or other work plate.

rlhe pressure for ensuring cutting action by thel tool, resultsv Afrom the gravity descent of the tool and its chuck, adjustable means being provided for restricting the downward movement of the supports for the router above referred to, for the purpose of limiting the depth of the cut secured.

I also construct the machine so that the laterally condensed to` a variable extent, as

condensa-tion may both be varied by a proper `setting of the ina-chine, or, if desired, the attachment may be used without modifyingthe normal operative efectsvof the machine, a condition which will more fully appear hereinafter.

The machine is also 'so constructed that, if desii'eththe letters, numerals orcharacters Y(lift-lie reproduction may be tilted to theright, or to theleft, by a simple adjustiment in tlie machine,and the degree of departure from the vertical resulting in such tilting etl'ect, may be regulated within reasonable bounds. ,Y

VThe invention consists in the novel features of construction and combination of parts hereinafter set forth and described, and more particularly po-inted out in the claims hereto appended.

Referring to the drawings- Fig. 1 is a front View of the upper portion "of an engraving machine embodying ni'v invention; y

Fig. 2 is a side View thereof;

Fig., 3 is a plan view Iotn the line 3 ezt-.Figi `2; and

Fig. -l is a` diagrammatic view illustrating a` portion of the mechanism by which the curved, condensed reproduction is secured.

Y Like numeralsrefer to like parts throughout the several views.

In the en'ibodinient of my invention shown in the drawings, 10 indicates a table having mounted thereon parallel vertical columns 11 and 1Q,` connected by a top stay 13 and having adjustably mounted thereon a cross head 1-l carrying ay work table supporting bracket 15, said cross head 14 and bracket 15 possessing sutlicient rigidity to secure the desired firmness of the work table while the machine is inA use. rl`he bracket 15 is provided with` parallel f-lideways or tracks 1li upon Aoppose'siflcs thereof. upon which is slidablv mounted. a lrrriage 17, a set screw 1T being provided for securing said carriage rl? any desired position. Said carrie 1'? has ate-rallyY extending slideways or tracks 18 thereon projecting' right an glee toi ther slideways or tr cks 16 upon which is slidably mounted a second carriage 19 supporting a plate 2( adapted to cari?,Y the work holder 21 forming therewith a work table, one of the members of which. 20, is capable of longitudinal and lateral adjustment, and the other of which, 21, has movement with the plate 20, and in addition to such movement is capable of circular adjustment about a pivot securing it to the plate 20. A set screw 23 is used to secure the carriage 19 in any adjusted position.

rl`hemen'1ber, or plate, 21 oppositely ydisposed work securing the panel hoard or other article in fixed position upon tlie work table.

Vthe plate 21 is provided with one cirn cular edge provided with graduations and nonding notches as shown more particy in Fig. 3 of the drawings, by means of which any desire-d` degree of angular adjustment may be imparted to said plate 21 and the clamps 24 carried thereby.

The cross stay l?) has centrally thereof a sleeve in which is adjustably mounted a rod 26 adapted to be set in any adjusted posit-ion by means of the set screw 27. llearwa-rdly of the machine, the rod 26 is provided with a bracket 28 from which is suspended by means of a universal connection or joint 29, a pendulous transmitter arm 30. rl`he joint 29 is of a type generally known yas a compass mo'lunt, and a. detailed description thereof is immaterial, since any desired form of universal joint may be used in lieu of that shown. Furthermore, this type of joint has been extensively used by me in engraving machines, as permitting great. nicety in the fitting of the different parts, and the elimination of lost motion due to wear. and resulting` in possible loss of precision in reproductions.

lilo-tinted upon the transmitter arm 3() is a sleeve 31 having pivoted thereto by means of horizontally arranged pivots, a` work tool actuating arm 32 carrying at the free end thereof a support having a chuck S4 for the engraving tool or router rThe details of construction of the arm 32 shown in the drawings, are largely mat-ters of mechanical detail, although the pivotal relation between the stem 36 of the support 33 and said arm 32 is to facilitate the adjustment of the work point or router in the event that it is desired to set the machine so as to secure a. tilt in the numbers. letters or other characters `in the reproduction. as will more fully appear hereinafter. rlhis pivotal relation between the stem 36 and the arm 32 will also compensate for the. arc described by the transmitter arm 30 about its mount 52.9 laterally of the machine. l

Adjustably mounted upon one of the vertical columns. 12. is al sleeve 37 carrying a slideway 3S upon the side thereof toward the front of the machine, and having` mounted therein a` vertically n'io'vahleuslir'le carrying an arm 40 projecting laterally of the machine. Rigidly secured to this arm are is provided with clamps 24 for parallel `rods 41,-42 karrangedl in the same horizontal plane, which serve as supports for the work tool actuating arm 32, the support 33 for the chuck 34 having laterally extending arms 43 and 44 which engage the rods 41 and 42.

Preferably the rods 41v and 42 and the arms 43 and 44, have rounded contacting surfaces so as to reduce the bearing area to an extent to avoid any such fricional resistance at this point as would materially interfere lwith the free actuation of the various parts of the machine incidental to the movement of the router35.

The slide 39 is provided with an adjustabler extension 45 yhavinga collar46 thereon, be-y tween which collar and the table 10 of the machine, a 'spring 47 acts toY normally elevate gage the router or other tool from the work plate. The end of the extension 45 is'connected with a suitable pedal mechanism 48 so as to permit the operator to move the supporting rods 41-42 downwardly in a convenientmanner.

Toinsure the desiredA limited Yextent of c movement of the supporting rods 41 and 42 by means independent of the pedal or other mechanism for imparting downward movement thereto, I provide the slide 39 with an adjustable stop screw 49 adapted to engage the extension 50 between the sleeve 37 and the slidewayv 38, and thus, limit the downward movement of the slidev 39 and' permit the `maximum depth of cut of the tool to be reasonably accurately defined, and yto be varied to adapt the machineto the reproduction of letters, numerals or other characters of different sizes which require different widths yof cut. This variance in the width of cuts isfdue to the fact that the tool 35 is of gradually increasing dimensions from its point upward, as an ordinary graver, so that the greater the penetration of the tool the ygreater will be the width of `theline being out; At the same time with a single setting of the stopscrew 49 substantial uniforrnity of depth ofthe lines yin different letters, numerals or characters, is assured.'

Since precision is notnecesary in this character vof work, a screw of fairly low pitch' may bensed, micrometrical adjustment, as in thewproduction of printing plates, metal matrices, and other work of' this character, not being required. Y ,A

Panelboards ordinarily are made of hard vulcanized rubber, bakelite, or other'similar material which is sufficiently soft to permit the penetration of the router 35 under fairly light pressure, andV as the overbalancing weight of the arm 32 is fairly heavy,in order l to secure rigidity, I preferably providesaid arm vwith acounterweighted ,extension 51 to by the router upon the `initial engagement of the router therewith, particularly as too deep a penetration might result in a tendency of the routerto chip the material at the edges of the lines being cut, and it is desirable to avoid chipping in the interest of good workmanship.

Mounted upon the lower end of the pendiulous transmitter arm 3() is a main stylus arm 52 l'iaving formed therein' an opening adapted to receive the lowerend of said transmitter arm, said arm having oppositely disposed projections 53 and 54 with which pivot screws 55 and 56 carried by said arm 52, engage. This permits movement of the armv 52 with relation. to the transmitter arm v 30 about a horizontal axisr only, kfor the purpose of facilating the raising or lowering of said arm 52ste enga-ge the stylus 57 carried thereby with the work, or with a supplemental stylus arm which will be more fully referred to hereinafter, andv also `to compensate for the are described by the transmitter arm 30. v

It will be readily understood that 'to' secure reasonable accuracy in the reproduction, the transmitter arm 30 must have move-k ment, at the point of connection of the arm 52 therewith,y simultaneously with,` andr simi lar to that of the stylus 57, the scale of reproductionv being determined by `the point of connection of theworl; tool actuating yarm 32 with the transmitter arm 30. v f

The mechanisms heretofore described will permit the reproduction of any Vdesired pattern upon a reduced scale by moving thestylus 57 in accordance with "said" pattern. To permit substantial variation in the scale of reproduction, the cross head 14 is supported upon the columns lland 12 by means of sleeves 58 and 59 which are slidable upon said columns andare adapted tobe secured in position by the-clamp nuts (S0-'6 1 respectively. The back of-each'of the columns 11-12 vis provided with a rack 62 with which pinions 63 carried by the shaft 64 are j respectively in mesh, so that the cross head accommodate the work table Y'to different n adjustments of the arms 32 necessary to seou-re variation in the scale of reproduction. i f

`The sleeve 37 is also vertically adjustable upon the column l2, -this sleeve being split asshown and being provided with a clamp screw 65 for setting itin any adjusted position. This adjustment of the sleeve 37 is for the purpose of maintaining` a normal relativel position between the supporting rods 417 42 and the work table.

To permit this adjustment of the supporting rods 414-42, the extension 45 is adjustably .mounted in the-slide 39 so that iso by loosening the screws tl(` .,tlie distance tween the slide 35) and the collar t6 ma varied to meet the cond ms require@` adjustment of the sleeve S7.

Acting upon one of the gears 63 is a loci;- ing dog G7 which will supplement the action of the clamp screws (it) and (3l Vin preventing a loss of adjustment after the machine has once been set for a reprodzugftion upon any desired scale.

Connected with the chuck l-l is a flexible drive shaftS which may be connected with an electric motor or any other desired source of power, the support 33 while itself` nonrotary, forming a bearing for toe end of this shaft adjacent said chuck.

With some work, it is desirable to laterally condense letters, numerals, or characters, as well as to arrange them with their vertical centers parallel with each other althoughy arranged in an arc. To meet this condition, I provide the machine with a supplemental tracing stylus arm with which the stylus-57 of the main stylus arm 52 may be engaged so that movement of the supplemental stylus arm laterally of the machine will impart a lesser quantity of lateral movement t-o the stylus arm 52, the relative position of these two arms being capable of such adjustment as will permit the control of the extent of 'this difference in lateral movement. EAI: the same time, the operative effect of this supplemental stylus arm will be to position the different letters, numerals or characters in an are, the relative adjustment of the two stylus arms above referred to having the elllectof varying the radius of this arc.

The above condition results from the fact that when the supplemental stylus arm is used, the pivotal movement of this arin resultsin a slight arcuate movement of the main transmitter arm 52' because of the variance in the axis of the pivot 75 with relation to the axis of the transmitter arm 30, because of the combined sliding movement of the carriage 73 and the pivotal movement of the supplemental stylus arm. By reference to Fig. il, it will be observed that the two dotted indications of the main stylus arm upon opposite sides of this ligure as to the point of connection between same and the supplemental stylus arm 69, shows that the stylus arms 52 have been advanced slightly with relation to the straight line indicatingthe path of movement of the stylus 79. Since this change of position will be gradual, it is apparent that there will be a gradual change in the position of the work tool between the central position shown in full lines, and each side position. It is also apparent that this forward position is relatively greater than it would be if the stylus 57 were engaged nearer the endmiosty recess or depression 71. If it be assinned, with reference to Figgh that the stylus 57 ispositioned in the ,depression 7l, closest to the carriage 7BY in the central .position, and then assume that the dotted position on either side corresponds, it willbe The. supplemental stylus arm referred to is composed of two telescoping sections 69-70, the upper face of the section 29 being provided witha sequence of depressipns 7lr to receive the point of the stylus ai. the two sections (39 and 70 of said supplemental stylus arm in any adjusted position.

Mounted upon the table l0 is a carriage 73 carrying thereon a block 7,4 having mounted therein a pivot 75, the axis of which extends vertically, said pivot having laterally and horizontally extended arms 7 G to which the forked end 77 of the section 70 of the supplemental tracing stylus arm is pivotally mounted by means of the pivot screws 78. By this mannerv of mounting the arm (S9-70, said arm is permitted Yt-o have universal movement, the slidability of the carriage 73 longitudinally of the machine compensating for the arc described by the stylus 79 carried by the section 69 so as to permit said stylus to follow a straight line upon the pattern. rhe carriage 73 is mounted upon the table l0 by means of raceways S0 and 8l upon said table and upon said carriagerespectively, and bearing balls having movement in said raceways.

it is sometimes desired to Tary the reproduction by tilting the letters, which is secured by means of vertical extensions 8:2 and 83 upon diametrically opposite sides of the sleeve bl, each of which extensions has a sequence of vertical depressions there.- in adapted to receive pivot screws Sli carried by the yoke 85 of the work point supporting Varm 32. rEhe arm 32, as heretofore stated, is connected with the supportl S-lhy means of a. rod 36 lpivotally mounted in said arm 32, the inner end of which is screw-threaded and carries a lock nut 86 so as to permit ana'ular adjustment of the ari 82 about the .Y s of said rod 36 carrying the support 33. lf it be desired to tilt a reproduced letter, numeral or character in one direc-'tion or the other, the pivot screw S4 upon onel side of said yoke 85 is engaged with one of the recesses upon the extension 8i?. while the pivot screw 84 upon the other arm of said yoke is connected with a recess upon the other extension 83, located upon a different horizontal plane from the recess in the arm S2 engaged loy the pivot screw, as above referred to.

The carriage 73 is `provided with an Set screws 72 are provided to secure lio undercut groove 87 Vby means y"of-which the block 74 is adjustably mounted upon said carriage by means of a Tbolt 88. f

The circularly adjustable work plate 21 `is provided on thefvrear edge' thereofwi-th a segmental notchcd'edge 39 with whichk a locking member 9() carried by the plate' 20 is adapted to cooperate so as to normally prevent relative movementof said plates while permitting a sequence of definite angular movements Lof the plate 21 upon the plate 20 and about the pivot 22. f

The table 10 is Iprovided with a suitable holder 91 for'facilita-ting the mounting of a pattern thereon, this 'holder including parallel guides 92-93, one of which is movable toward. and from the other for permitting the ready shift-ing of the pattern to bring different letters, numerals or characters in the` desired position.

The' operation 'of the herein described machine is substantially as follows.

' When it is desired to engrave matter upon a panel boa-rd, or similar flat surface, the clamps 24 are used to secure this-board in position upon the plate 21, and a pattern is secured in the holder 91. The subsequent procedure will vary according to whether it is desired to arrange the reproduction ot the graduation lines, letters, numerals or characters upon the patternv in a.y straight line or in an arc, or to condense the'diiierent letters, numerals or characters, o-r have their vertical centers parallel Withfeachother or disposed radially of the center of the arc upon Whichthey are positioned. n y

lf it be desired to have the different parts of the reproduction appear in a straight line, the supplemental stylusy arm 69 7 O need notbe -used at all, or the stylus 57 carried by the arm 52 may be inserted in the depression 71 of' the supplementalv stylus arm in, axial alinement wit-h 'the' stylus 79. In either case the movement of the transmitter arm 30 resulting from the movement of the stylus 57 or 79 over the lines of the pattern Will be the same, the result being a. movement of the support 33, chuck 34 and router or work tool 35 in a path exactly coinciding with the movements of the tracing stylus 57 or 79, the quantity of this movement, however, being reduced by reason ofthe connectionof the Work arm 32 withsaid transmitter arm 30'intermediate the point' of pivot-al support of said pendulous arm L30 andthe connection loe.- tween the end of this arm and the stylus arm 52. v vvThe scale of the reproduction may be varied by adjustingthe sleeve 31 longitudi nally of the transmitter arm,` the nearer thisV sleeve approaches the universal connection-t or joint 2,9, the smaller being thev scale of reproduction. 'It is apparent that any ma`--v terial movement et the sleeve 31V4 will neces# thereby, which adjustment is made by means oi the shaft 64, 'pinions G3 and racks 62.I theclamps' 69 and 61 being used to secure said cross head in relation to the vertical columns 11 and 12 after such. adjustment,` the dog` '64 engaging one of said pinions, as 63, being used solely for the purpose of supplementing the locking action of said clamps in preventing movement of said cross head by preventing rotation of said shaft G4, which is essential to permit movement ot the cross head.y

It is 'apparent that adjustment of the stop screw 49 will permit minor adjust* ments of the sleeve 31 Without necessitatingcorrespondingadjustment of the cross head .14.

Vhen the parts have been so adjusted as to secure the desired scale of reproduc-` tion, the stop screw 49 may be adjusted to limit the downward movement of the slide 39 to an extent to secure the desired penetration of the router orother tool 35 Ainto the'work plate. The spring 47 will normally hold said slide, the arm 40 mounted thereon, and the supporting rods 41-42, at their uppermost limit, ity being necessary to draw theslide downwardly by means of the rod 45 and the pedal 48 to engage said rout-er or other tool with the Work, the stop 49 limiting this downward i movement and permitting variation inthe depth of cut by a mere adjustment of said stop screw with relation to the extension 50 of the sleeve 37. f i

It is to be noted that in the event of adjustment of the cross head 14, the sleeve 37 may also be adjusted vertically, the rod 45 having telescoping movement within. the slide 39'. i i

As the rods 41 and 42 are drawn downwardly, the holder 33, the lateral extensions 43 and 44 of which engage said rods 41 and'- 42, will descend by gravity, the arm 32 pivoting upon the horizontal pivot screws 84 and at the same time prevent any lateral rotative movement of said holder. f

The ieXible shaft 68 will not only permit the necessary universal movement of the chuck 34upon a single plane, but will permit'anyr adjustment of the supporting rods 41 and 42 in changing the scale of reproduction. i

ASince the location of the support 33 belimit` the range' ofmovementot1 the router 35, I provide the superimposed carriages 17 and 19 movable upon slideways 'whichfexe Vtend at right angles to each other so that the tween the supporting rods 41 and 42 will' y oo i dilerent elements of the reproduction in an arc, the machine must be adjusted different- 1y Jfrom that above described, the adjustment varying according to the character of the reproduction desired. Assuming that it is desired to produce ordinary scale markings with appropriate indicia, all arranged inan arc and the different scale markings accurately positioned With relation to each other, this result is secured by imparting a step by step pivotal movement to the plate 21 about the pivot 22 and successively reproducing a single scale marking upon the pattern sheet, the spacing,` ot' succeeding reproductions being determined by the pivotal movement ot said plate 21, the notched edge 89 and the co-operating locking` member 90 permitting accurate step by step movement ot the plate 21. It ivill be noted that the closer the portion ot the plate being Worked upon is to the pivot 22 the closer will be the graduation marks Wit-h relation to each other, but that the same accuracy .vill be present so that by adjusting the carriage 17 along the guideivays or tracks 16 therefor upon the bracket 15, the spacing between the graduations may be varied.

Hit be desired to produce an outline for the .graduations, this may be done by holding jthe stylus 57 or 7 9 stationary, bringing the slide 39 downwardly so as to engage the router With the Work and imparting continuous rotary movement to the plate 21.

It Will be noted that in the above operations, the movement of the tracing stylus Will be Within very small compass, since the shitting of the router 35 is not required, eX-

cept to reproduce the character, the spacing` being secured by the movement ot the plate 21. Hence, it it be desired to place numerals or letters in relation to said gauge markings, it will be necessary to bring the pattern of each of such into the same position upon the pattern holder, or ivithin the range of movement ot the stylus, Without any lateral shitting of the latter.

It it be desired to reproduce graduations, or Vother matter arranged in an arc upon different portions of a plate being worked upon, the carriages '17 and 19 are adjusted upon their respective slideways so as to posit-ion the plate with relation to the router 35 instead ot the usual practice of moving the router into position with regard to ditferent portions of the plate. Y

When characters are to be associated ivith different graduation markings, and it is desired to have the centers of these characters arranged parallel one with the other, .the carriages '17 and 19 may be moved to bring those portions of the plate Where the charaoters are to be positioned, Within the range oti'the router, the plate 21 not being pivetal-ly moved .during the reproduction of such characters. lt, hoivever, it is desired to have the centers of these characters eX- tend radially of the axis of the graduations arranged in arc, the carriage 17 only will be moved, to secure the desired vertical spacing, and thereafter the plate 21 Wil be pivotally moved after the reproduction ot each of such characters.

Instead of moving the carriage 17 to bring different portions of. the plate Within Working range of the router 85, the rod 26 may be adjusted in the sleeve with the same effect.

In the use of the machine in the manner above described, the stylus 57 will be engaged with the depression directly above the stylus 79. Y

It is sometimes desirable, however, to condense the insignia used nith a scale, or tO even arrange numerals and letters or legends Without regard to any definite sca-le, but in an arc under which conditions l do noty impart pivotal movement tof the plate 21, but merely utilize the supplemental arm 69---70 in a manner to simultaneously condense letters to the desired extent and at the same time cause them, in the reproduction, to be arranged in an arc, although in the pattern itself, these letters or numerals arranged upon a straight line. Then this attachment is used no shitting ot the characters ot the pattern is required, and the pattern in its entirety may be laid out upon the table 10 and the accurate positioning or placing` ot the di'lt'erent letters, numerals or characters is secured yby the lateral shitting ot the tracing stylus with a resultant lateral movement ot the transmit-ter arm SO and the router 35.

The condensing action above reterred to results from the ract that when the stylus 57 is shitted into different depressions 71, the movementoit the stylus 79 as detined by the pattern will :have the e'ltect ot causing similar vertical and lateral movements ot the stylus 57, the lateral movement being less than that ot' the stylus 79 as determined the difference in the distance in the movement ot' the stylus 79, and the point ot the arm carry ng same with Which the stylus 57 is engaged.l This condition introduces a vertical component ot movement to the stylus 57 which, a-s a result ot the sliding movement of the carriage 73, is relatively less, ivith a lateral movement ot the arm than n'ith a` movement thereof parallel with the raceways 80 and 81. This reduced lateral movement being simultaneous with the longitudinal movement, or movement parallel with said raceivays, introduces a curve in t-he reproduction, or la stepping ot the dillerent characters along' a line oblique to the horizontal.

The closer the s vlus 57 is to the vertical pivot .78, the greater the longitudinal movement of said carriage 73 with relation to the lateral movement of the stylus 57, will be, thus causing greater angle oit obliquity in the reproduction, or a shorter radius Vot thearc in which its characters are arranged,

with van increased lateralv condensation fot, the letters, numerals or characters.

Since the movements of the router are similar to those of the tracing stylus 57, the curvature oi' the reproduction will alwaysV be with the top thereof toward the back of the machine so long as the stylus 57 is positioned between the stylus 79 and the carriage 73.

If desired, the section 69 maybe extended with relation't'o the section 70 so as to bring some of the recesses 71 Jforwardly of the stylus 79, in which case a reverse curvature or 'Obliquity vwill result in the reproduction. By shifting the block 74 upon the carriage 73 by means of the undercut groove 87 therein and the T-bolt 88, the length ofthe arms 69 and 7()V may be shortened or lengthened according to the direction of adjustmentl of said' block, thus causing a relatively greater movement of the block withv the same ,lateral movement of the stylus 79 over the pattern,` which will reduce the radius of the arc Vot the reproduction with a shortening of said arm, or increase thisY radius, with a lengthening of the arm, with a corresponding decrease in the length of the `lateral lines ot the reproduction, oran increase in said lines respectively, it being understood vthat the length of the vertical lines'.V of thefreproduction always reinain'the saine.

Then reproducing a pattern by 'means of 'the supplemental stylus arm (S9-70, the reproduced letters, numerals .or characters will always have their vertical' centers parallel one with the other. v

So long as the pivot screws 84 .are upon the same horizontal plane, the vertical lines upon the pattern will cause the .corresponding linesV upon the reproduction to extend vertically, these vertical lines being the height lines of the reproduction.

When the router 35 is moved into anc out of engagement with the work plate, the arm 32 moves about a horizontal axis only as a result of the arrangement of the pivots 84, which movement also compensates for the arc described, by thetransmitter arm 30 during its movement'to reproduce the pattern. It, however, one of the pivots 84 be raised. 'to a4 different horizontal plane from the other, a .slight lateral component will be introduced j in the pivotal movement of` the arm 32, resulting in a slight lateral detlection` of said arm, andr conseo |uen'tly,` of the `router, s othat the reproduced line will be slightlyfinclinedto the vertical, to an extentxaccording .to the degree and the direction of lthe tilt of the arms ot`v thebracketS'. When" adjusting the pivots 84;

the stein 36 so as tohave the support 33 extend vertically and engage both a-rins 4;?)

and 44ttliereof with the supports 4-1 and lVorlr of the character for which the ina` chine of my invention is designed, does not require that precision inthe depth of cut or in the width ot lines which` isr required when making plates for printing purposes. Hence the depth of Cut need not be regulated with any great nicety.y although when the machine is once set, it is apparent thaty all ot the lines in the reproduction will be of substantially the saine depth and width` stop screw i9 may be used to vary the'width oit the lines produced, an increased depth of cut resulting"y in an increased width of the lines, and `vice versa. f

f Pivotal movement of the plate 21 byreason of its notched edge, will ensure absolute .accuracy in the spacing of graduation lines,

although, upon panel boards, gauge plates and similar articles. absolute precision is not necessary, evenin the Ispacing ot such lines. f i l It is apparent that ii it be desired to have the vertical' center lines of the letters, numerals or characters associated withan arcuate graduated scale, parallel. the plate 21 may be used to cause the product-ion of the graduation lines upon the work plate,

-and this plate 2l may ralso be used conjointly with the stylus l,arm 6.95-70. to reproduce such letters, numerals or characters, the stylus 57 beingso set with relation to. the arm as to cause the arc in which the letters, numerals or characters are formed, to coinciderwith that of the lgraduated scale.

The

rItis not iiiy intention to limit the inven-r tion to theprecisedetails of construction shown Vin the accompanying drawings, 1t being apparent that such' inay'be .varied without departing troni the spirit and scope of the invention.

Having describedthe invention, what I claim as new^ and desire to have protected by Letters Patent. is z- 'n Y1. An engraving machine embodying therein a pattern support, a worktable, a pendulous transmitter arm, a'iiniversal bearing for one end of said arm, a stylus arm,

pivots connecting said stylus arm to the.

other. end of said4 transmitter arm, whereby the stylus carried ,by said iai-mis permitted to havenioveinent toward and from. said pattern suppornaV work tool supporting arm,

-a pivotal .connection between said supporting arm Vand ,saidV transmitter arm intermediate its ends, where/by said supporting `arm may may have movement toward' and from said wort table, a work tool supportcarried by said arm", a work' tool` holder rotatably mounted in said support, a flexible driving shaft connected with said holder, supports for the work tool actuating'` arn'i, means whereby said supports may be moved vertically to permit movement of said arm toward and from said work table, and means whereby the quantity of movement ot said supports may be regulated.

2. An engraving machine embodying therein a pattern support, a work table, a pendulous transmitter arm, a universal bearing for one end of said arm, a stylus arn ,pivots connecting said stylus arm to the other end of said transmitter arm, whereby the stylus carried by said arm is permitted to have movement toward and from said pattern support, a. work tool supporting arm, a pivotal connection between said supporting arm and said transmitter arm intermediate its ends, whereby said supporting arm may have movement toward and from said wor; table, means whereby the pivotal connection between said work tool supj'iorting arm and said transmitter arm may be adjusted axially of said transmitter arm to vary the scale of reproduction, a. work tool support carried by said arm, a work tool holder rotatably mounted in said support, a flexible driving shaft connected with said holder, supports for the work tool actuating arm, means whereby said supports may be moved vertically to permit movement of said arm toward and from said work table, and means whereby the quantity ot movement of said supports may be regulated.

SQAn engraving machine embodying therein a pattern support, la work table, means whereby the work table may be vertically adjusted, a pendulous transmitter arm, a universal bearing for one end of said arm, a stylus arm, pivots connecting said lstylus arm to the other end of said transmitter arm, whereby the stylus carried by said arm is permitted to have movement toward and from said pattern support, a work tool. supporting arm, a pivotal connection between said supporting arm and said transmitter arm intermediate its ends, whereby said supporting arm may have movement toward and from said work table, means whereby the pivotal connection between said work tool supporting arm and said transmitter arm may be adjusted aXially of said transmitter arm to vary the scale of reproduction, a. work tool support carried by 4said arm, a work tool holder rotatably mounted in said support, a flexible driving shaft connected with said holder, supports for the work tool actuating arm, means whereby said supports may be moved vertically to permit movement of said arm toward and from said work table, and means whereby the quantity of movement of said supports may be regulated.

, e, engraving machine embodying therein a pattern support, a work table, a pendulous transmitter arm, a universal bearing for one end of said arm, a Stylus arm, pivots connect-ing said stylus arm tothe other end of said transmitter arm, whereby the stylus' carried by said arm is permitted to have movement toward and from said pattern support, a work tool supporting arm, a pivotal connection between said support-ing arm, and said transmitter arm intermediate its ends, whereby said supporting arm may have movement toward and from said work table, a work tool support ycarried by said arm, a work tool holder. rotatably mounted in said support, a flexible driving shaft connected with said holder, vertically movable support-ing rods above said work table, means normally holding' said rods away from, and adapted to impart movement thereof towards, said work table, and members carried by said tool holder support engaging said rods, whereby penetration ot' the work plate by the tool results from the descent of said tool by gravity.

5. An engraving machine embodying therein a pattern support, a work table, a pendulOus transmitter arm, a universal bearing for one en d of said arm, a. stylus arm, pivots connect-ing said stylus arm to the other end of said transmitter arm, whereby the stylus carried by said arm is permitted to have movement toward and from said pattern support, a work tool supporting arm, a pivotal connection between said supporting arm and said transmitter arm intermediate its ends, whereby said supporting arm may have movement toward and from said work table, a work tool support earried by said arm, al work tool holder rotatably mounted in said support, a flexible driving shaft connected with said holder, vertically movable support-ing rods above said work table, means normally holding said rods away from, and adapted to impart movement thereof towards, said work table, members carried by said tool holderl Ysupport engaging' said rods, whereby penetration of the work plat-e by the tool results from the descent of said tool by gravity, and means whereby movement of said supporting rods toward said work table is limited, to control the depth cut of the tool.

6. An engraving machine embodying therein a pattern support, a work t-able, a pendulous transmitter arm, a universal bearing for one end of said arm, a stylus arm, pivots connect-ing said stylus arm to the other end of said transmitter arm, whereby the stylus carried by said arm is permitted to have movement toward and from said pattern support, a work tool supporting arm, ,a pivotal connect-ion between said supportingarm and said transmitter arm intermediate its ends, whereby said supporting may have movement toward and Fil from said work table, a work tool support carried by said arm, a work tool holder rotatably mounted in said support, a flexible driving shaft connected with saidv holder, vertically movable supporting rods above said work table, means normally holding Y said rods away from, and adapted to impart movement thereof towards, said work table, members carried by said'tool holder support engaging said rods, whereby penetration of thework plate by the tool results from the descent of said tool by gravity, a movable support for said rods, a guide therefor, and a stop screw adapted to-engage said guide and adjustably mounted in said'support, whereby movement of said supporting rods toward said 'work table is limited, to control the depth of cut of the tool.

V7. An engraving machine embodying therein a pattern support, a worl'table, a pendulous transmitter arm, a universal bearing for one end of said arm,y a `stylus arm, pivots connecting said stylus arm to the other end of said transmitterarm, whereby the stylus carried vby said arm is permitted 4to have movement toward and from said pattern support, a vwork4 tool supporting arm, a pivotal' connection between Isaid supporting arm and saidwtransmitter arm intermediate its ends, whereby said supporting arm` may have movementltoward and from said work table, means whereby the pivotal connection between said'supporting arm and saidy transmitter-arm may be adjusted` axially of said transmitter a-rm to vary the scale of reproduction, a work tool support carried by said arm, a 4worlrtool holder rotatably mounted in said support, a fiexible driving shaft connected with said holder, vertieally movable supporting rods above, said work table, means normally holding said rods away from, and adapted to impart movement thereof towards, said work table, members carried by ysaid ntool holder support engaging said rods, whereby penetration ofthe work plate by the tool results from the descent of said toolby gravity, an adjustable stop movable with said rods, and a fixed member adapted to be engaged thereby, whereby movement of said supporting rods toward said work table is limited, to control the depth of cut of the tool.

8. An engraving machine embodying Ytherein a. pattern support, a work table, a

pendulous transmitter4 arm, a universal bearfor one end of said arm, a stylusarm, ois connecting said stylus arm` to the kothtr end of said transmitter arm, whereby the stylus carried by said armispermitted termediate. its ends, v,whereby `said supporting l arininay have movementjtoward and from said work table, ay Work tool support carried by said arm, a work tool holder rotatably mountedin saidv support, alexible driving shaft connected with saidl holder, means whereby said work tool supporting arm may be moved'k toward and from said work table, and adjustable means controlling the operattive effect of said last named means, ywhereby the `extent of movement of said tool supporting arm may be limited to secure the desired depth of cut. Y

n, 9. An engraving machine embodying therein a pattern support, vertically extending columns above same, a cross head adjustably mounted upon said columns, a work table carried by said cross head, a pendulous transmitter arm, a universal bearing for one end of said arm, a 'stylus arm, pivots connecting said stylus arm with the other end of said transmitter arm, whereby the stylus carried by said arm is permitted to'have movement toward and from said pattern support, a work tool supporting arm, a pivotal connection between sail supporting arm and said transmitter arm intermediate its ends, whereby said supportingv arm may have movement toward and from said Work table,` a work tool said sleeve may be adjusted vertically 'ofi said column, telescoping means for actuating said slide, a spring acting thereon for normally holding said rods away from said work table, members carried by said tool holder support engaging said rods, whereby with the downward movement of said rods ,penetration of thel work plate ,by the tool results from the descent of4 said tool by gravity, and a stop screw carried by said slide, and adapted to engage the extension of s the sleeve supporting saine, whereby movement of said supporting rods toward said work table isflimited to control the depth of cut of the tool. s e v l0. An engraving machinewembodying therein a pattern support, a worktable, a

-pendulous'transmitter arm, a universal bearing for one end of said arm, a stylus arm, pivots connecting said stylus arm to the other end of said transmitter arm, whereby the stylus rcarried' by said arm is permitted i to have "movement'toward and fromV said pattern support, a work `toolV supporting arm, .a pivotal connection between said supporting arm and said transmittery arm 1niis termediate its ends, whereby said supporting arm may nave movement toward and trom said work table, a work tool support carried by said arm, a work tool holder rotatably mounted in said support, a tlexible driving` shatt connected with said holder, vertically movable supporting` rods above said work table, means normally holding,` said rods away trom, and adapted to impart movement thereof towards, said work table, members carried by said tool holder support engaging said rods, whereby penetration ot the work plate by the tool results from the descent of said tool by gravity, and a counter weight actingupon said tool supporti.nav arm to retard the movement of the tool support by gravity.

11. An engraving,` machine embodying therein a pattern support, a work table, including therein a pivot-ally supported plate and clamps thereon adapted to engage a work plate thereon, whereby ditlerent portions ot said work plate by successive angular adjustments ot said pivotally mounted plate may be brought within the range ot a work tool to cause an arcuate arrangement of the reproduction, a pendulous transmitter arm, a universal bearing' tor one end ot said arm, a stylus arm, pivots connecting said stylus arm to the other end ot said transmitter arm, whereby the stylus carried by said arm is permitted to have movement toward and from said pattern support, a work tool supporting' arm, a pivotal connection between said supporting arm and said transmitter arm intermediate its ends, whereby said supporting' arm may have movement toward and from said work table, a work tool support carried by said arm, a work tool holder rotatably mounted in said support, flexible driving shaft connected with said holder, and means whereby said work tool supportiire` arm may be moved toward and trom said wort table.

l2. n engraving machine embodying` therein a pattern support, a work table, including therei a pivotally supported plate, clamps thereon adapted to engage a work plate thereon, whereby ditl'erent portions o't said work plate by icessive angular adjustments of said pivotuily mounted plate may be brought within the range ot a work tool to cause an arcuate arrang'enrent o the reproduction,

,said pivotally supported plate having` an arcuate edge provided with graduation notches, and locking means co-operating` with said notches, whereby said plate may be held in any adjusted position, a pendulous transmitter arm, al universal bearing; tor one end ot said arm, a stylus arm, pivots connecting` said stylus arm to the other end Yof said transmitter arm, whereby the stylus carried by said arm is permitted to have movement toward and Jfrom said patte n support, a Work tool supporting arm, a

pivotal connection between saidsupporting:r arm and said transmitter arm intermediate its ends, whereby said supporting;l arm may have movement toward and trom said work table, a work tool support carried by said arm, a. work tool holder rotatably mounted in said support, a tiexible driving shaft connected with said holder, and means whereby said werk tool supporting arm may be moved toward and from said work table,

l. An engraving machine embodying therein a pattern support, suitably supported tracks, a carriage slidably mounted upon said tracks, tracks upon said last named carriage extending' at right. angles to said first. named tracks, a carriage mounted upon said last named tracks, and a work table supported by said last named carriage consisting' ot' a plate carried by said carriage, a pivotally supported plate, clamps thereon adapted tov engage a work plate thereon, whereby dili'erent portions ot said work plate by successive angular adjustn'ients ol said pivotally mounted platemay be brought within the range oin u work tool to canse an arcuate arrangement ot the reproduction, said pivotally supported plate having an arcuate edge provided with graduation notches, and locking means evo-operating with said notches, whereby said plate may be held in any adjusted position, a. pendulous transn'iitter arm, a universal bearing for one end ot' said arm, a tt-ylus arm, pivots connecting said stylus arm to the other end oitI said transi'nitter arm, whereby the stylus carried by said arm is permitted to have movement toward and trom said pattern support, a work tool supporting` arm, a pivotal connection between said supporting;l arm and said transmitter arm intermediate its ends, whereby said suppoitilrer arm may have movement toward and from said work table, a work tool supportA carried by said arm, a work tool holder rotatably mounted in said support, a flexible driving shaft connected with saidholder, and neans whereby said work tool supportingl arm may be moved towart and from said work table.

ld. An engraving;` machine embodying therein a pattern support, a work table, apendulous transmitter arm, a universal bearing; Jfor one end of said arm, a stylus arm, pivots connecting said stylus arm to the other end ot said transmitter arm, whereby the stylus carried by said arm is permitted to have movement toward and trom said pattern support, a work tool supporting arm, a pivotal connection between said supporting` arm and said transmitter arm intermedia-te its ends, whereby said supporting arm may have movement toward and from said work table, a work tool support carried by said arm, a work tool holder rotatably mounted in said support, a flexible driving shaft conlll() the machine will impart the same quantity of movement to said lirst named stylus arm, and

movement of said supplemental stylus arm laterally of. the machine will impart the same lateral movement, or a lesser lateral movement with a longitudinal component to said other stylus arm, according to the depression with which said stylus arm is en'- gaged.

15. An engraving machine embodying therein a` pattern support, a work table, a

pendulous transmitter arm, a universal bearing for one end of said arm, av stylus arm, pivots connecting said 4stylus arm to the other end of said transmitter arm, whereby the stylus carried by said arm is permitted to have movement toward and from said pattern support, a work` tooly 'supporting arm, a pivotal connection between said supporting arm and said transmitter arm intermediate its-ends, whereby said supporting arm may have movement` toward and from said work table,`a work tool support `car-y ried bysaid arm, a work -tooil holder rotatably mounted in Ysaid support, al flexible driving shaft connected with said holder, means whereby said worlrtool supporting arm may be moved toward and from said work table, Ya carriage capable of movement to- Ward'and from said pattern support, a`

supplemental stylus armhaving a sequence ot' depressions kadapted to be selectively Vengaged by the stylus oft said first named stylus arm, a. universal connection between said supplemental stylus arm and said'car-L riage, whereby movement of said supple mental stylus arm longitudinally of the machine will impart the same quantityof movement to said 'first named stylus' arm, and movement of said supplemental stylus arm` laterally ot' the machine will" impart the same lateral movement, v'or a vlesser lateral movement with 4a longitudinal component to Ysaid other stylus arm, according to the depression with which 4said stylus arm is engaged, a support tor said universal connection carried byand adjustable longitudinally of said carriage, and means whereby the length of said transmitter arm may be varied to change the longitudinal component ot motion of `said first named stylus arm with lateral movement Yof the stylusrarried by said supplemental stylus arn'l.. Q Y i y K. i

16. An engraving machine embodying therein a pattern support, a work table, a pendulous transmitter arm, a universal bear ing for one end otsaid arm, a stylus arm,` pivots connecting said stylus arm to the other end ot said transmitter arm, whereby the stylus carried by said arm is permitted to have movement toward and from said pattern support, a work tool supporting arm, a pivotal connection between sain supporting arm and said transmitter arm intermediate its ends, whereby said supporting arm may have movement toward and from said work table, a wort: tool support carried by said arm, a work tool holder rotatably mounted in said support, a flexible driving sha-ft connected with said holder, rmeans,

whereby said kwork tool supporting arm may be moved toward and from said work v table, a carriage capable of movement toward and from said pattern support, a supplement-al stylus arm composed of two sections, one of which isa-Xially adjustable with. relation to the other, whereby the machine may b e so set as to give increased range in the curvature of the reproduction, said adjustable section having a sequence oit' depressions adapted to be selectively engaged the stylus of said first named stylus arm,

' and a universal connection between said sup-y plemental stylus arm and said carriage whereby movementv oit-said supplemental styklus arm longitudinally of the machine will impart the same quantity ot movement to` said first named stylus arm, and movement ot said supplemental stylus arm laterally ot the machiner will impart kthe same lateraly movement, or a lesser lateral movement with a longitudinal component to said other'stylusv arm, according. to the depression with which said stylus arm is engaged.

17. An engraving machine embodying' therein a pattern support, a work table, including therein a pivotally supported plater and clamps thereon adapted to engage a work plate thereon, whereby dilierent por tions of said work plate by successive angu- .lar adjustments of said pivotally mounted ward and from said pattern support, a work toolsupporting arm, a pivotal connection between said supporting arm and said transmitter arm intermediate itsends, whereby. said vsupporting arm may have movement toward and from said work table, a'wolir tool support carried by said arnna vworn tool holder rotatably mounted in said support, a

Aflexible drivingshaft connected Vwith said movement toward and trom said p" support, a supplemental stylus arm composed ot two sections, one ot which is axially adjust-able with relation to the other, whereby the machine may be so setas to give in creased range in the curvature ot the reproduction, said adjustable section having;v a sequence ot depressions adapted to be selectively engaged by the stylus ot said lirst named stylus arm, and a universal connection between said supplemental stylus arm and said carriage, whereby movement ot said supplemental stylus arm longitudinally of the machine will impartv the same quantity ot movement lo said lirst named stylus arm, and movement of said supplemental stylus arm laterally ot the machine will impart the same lateral in vement, or a lesser' lateral movement with a li'ingitudinal component to said other stylus arm, according to the depression with which said stylus arm is engaged.

18. An engraving` machine eunbodyiin therein a pattern support, a work table including Vtherein a pivotally support-e( plate and clamps thereon adapted to enga-` a work plate thereon, whereby dinerent portions ot said work plate by successive angular adjustments ot said pivotally mounted plate may be brought within the range ot a work tool to cause an arcuate arrangement ot the reproduction, a pendulous transmitter arm, a universal bearing for one end ot said arm, a stylu arm, pivots connectingj)` said stylus arm to the other end ot said transmitter arm, wherebyY the stylus carried by said arm is permitted to have movement toward and troni said pattern support, a work tool supportingv arm.y a pivotal connection between said supportin?,` arm and said transmitter arm intermediate its ends, whereby sai-d supporti.ne` arm may have movement toward and trom said work table, work tool support carried by said arm, a work tool holder rotatably mounted in said su 3 iort, a flexible drivinO shat't i D connected with said holder, means whereby the pivotal connection between said work tool supportingv arni and said transmitter arm may be adjusted axially ot' said transmitter arm to vary the scale ot reproduction, vertically movable sr-.pporting` rods above said work table, means normally holding` said rods away trom, and adapted to move them towards, said work table, members carried by said tool holder support engaging said rods, whereby penetration ot the work plate by the tool results trom the descent ot said tool by gravity, a carriage capable ot movement toward and trom said pattern support,

'a supplemental stylus arm composed ot two sections, one of which is axially adjustable retirees with relation to the other, rhino may be so range in the i" said adjns ile secivu: dejwressions adapted to be selectively gagged by the stylus ot said iirst named stylus arm, and a universal connection between said supplemental stylus arm and said erin riage, whereby movement ot said supplemental stylus arm longitudinally et the iran chine will impart the same quantity ot movement to said tirst named stylus arm` and movement oi said supplemental stylus arm laterally ot the machine will impart the same lateral movement, or a lesser lateral movement with a liugitudinal component to said other stylus arm, according to the depression with which said stylus arm is engaged.

19. An engraving machine embodying `herein a pattern support, a work table, a Jendulous transn'iitter arm, a universal bearingr tor one end of said arni. a stylus arm, pivots connecting said stylus arm to the other end ot said transmitter arm, whereby the stylus carried by said arm is permitted to have movement toward and trom said pattern support, a work tool supporting;- arm, a sleeve having' dian'ietrieally opposite extensions parallel with tlie axis ot said transniitter arm and adjustably mounted upon said arm, said extensions each having' a sequence ot' spaced depressions. therein, said tool supporting arni having; a Ytoria-irl end, pivot screws carried by the arms ot said forked end and adapted to be selectively engaged with the depressions upon s `d eff.- tensions respectivelj y whereby said supporting arm ma)Y have movement toward and trom said work table. either about a horizontal axis or an axis oblique to the horizon tal, a work tool support carried by said arm, a work tool holder rotatably mounted in whereby the masai-t support, a tlexible driving' sliai't Con-l nected with said holder, and means whereby said work tool supporting arm may be moved toward and trom said work table.

20. An engraving' machine en'ibodying therein a pattern supportr` a work table, a pendulous transmitter arm, a universal beariire` Ytor one end ot said arm, a stylus arm, pivots connecting` said stylus arm to the other end ot said transmitter arm, whereby the stylns'carried by arm is permitted to have movement toward and 'from said pattern support, a work tool supporting' arni` consisting ot a member having- 'forked end. a stem mounted in said member and capable ot angular adjustment with relation to its axis, and means tor locking' said stem in any adjusted position, a sleeve having` diametrically opposite extensions j'iarallel with the axis ot said transmitter arm an-d adjustably mounted upon said armT said extensions each having a sequence et spaced depressions therein, pivot screws carried by the arms of seid forked end and adapted to be selectively engaged with the depressions upon seid extensions respectively, e Work tool support 5 carried by seid stem, a Work tool holder rotatably mounted in said support, a flexible driving shaft Connected With said holder,

und means whereby seid Work tool support ing arm may be moved toward and from seid Work table.

In Witness whereof I have hereunto axed my signature this 28th dey of November, 1922.

WILLIAM S. EATON.

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