US1235668A

US1235668A - Pantographic engraving-machine.

Info

Publication number: US1235668A
Application number: US84395614A
Authority: US
Inventors: William S Eaton
Original assignee: Individual
Current assignee: Individual
Priority date: 1914-06-09
Filing date: 1914-06-09
Publication date: 1917-08-07
Anticipated expiration: 1934-08-07

Description

W. S. EATON. PANTOGRAPHICIENGRAVING MACHINE. APPLICATION FILED JUNE 9.1914.

1,235,668. I Patented Aug. 7,1917.

5 SHEETS SHEET I.

I a: 48 5 fl 9 1L 491mm test: I 42; Inventof: m y @w E w Atty W. S. EATON.

PANTOGRAPH IC ENGRAVING MACHINE.

APPLICATION FILED JUNE 9. I914.

Patented Aug. 7, 1917.

5 SHEETS-SHEET 2.

r 0 iv m V M,

W. s. EATON.

PANTUGRAPHIC ENGBAVING MACHINE.

APPLICATION FILED J.UNE 9,1914. 1,5,6 Patent-ed Aug. 7, 1917;

5 SHEETSSHEETI3.

Atty w. s. EATON.

PANTOGRAPHIC ENGRAVING MACHSNL APPLICATION FILED mm: 9. 1914.

Patented Aug. 7, 1917.

5 SHEETS-SHEET 4.

E EE EEK EEE ifi immw In ven tpr:

A Atty W. S. EATON.

PANTOGRAPHIC ENGRAVING MACHINE.

APPLICATION FILED JUNE 9.19M.

Patented Aug. 7, 1917.

5 SHEETS-SI1EET 5- WILLIAM S. EATON, F SAG HARBOR, NEW YORK.

PAHTTOGRAPHIC ENGRAVING-MACHINE.

Application filed June 9, 1914:. Serial No. 843,956.

To all whom it may concern:

Be it known that I, WILLIAM S. EATON, a v 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 Pantograph'ic Engraving-Machines, of which the folloW- ving is a specification, reference being had therein to the accompanying drawings, which form a part thereof. v My invention relates to pantographic engraving machines and more particularly to a type thereof wherein the re roducing point or tool has movement relative to the Work-bed su ort.1

Pantograp 1c engraving machines have heretofore been extensively used in the printing trades, in engraving jewelry and in making dies in certain ofthe industrial arts but most machines so used have had a limited operative range; and have been so delicately adjusted and so complicated as to be nonadaptable for heavy Work, and to introduce slight-error in the reproduction. By my present invention, I aim to .provide a machine, the pantographic element of which will be sufficiently rigid to insure accuracy in the operation of this mechanism and will be capable of such accurate and minute adjustment as to preserve the accuracy of the reproduction, irrespective of a change in the scale thereof; .and wherein the work suport will have a stability to adapt it to both light and heavy Work. In constructing my machine, I preferably make the work supports adjustable both vertically and horizontally so as to adapt the support for use with work of different thickness and permit the movement of the work-bed so as to bring the work within the operative range of the reproducing tool or point. To aid in securing accuracy inthe reproduction, I 1 mount the parallel bars or levers constituting the pantographic mechanism upon a rigid pivotal armmoving about a fixed axis, and employ means whereby the efiective,

' leverage of all of the arms of this mechanism may be adjusted with relation to the eflective leverage of the said supporting arm, which latter is adapted to be firmly connected with one of the-connecting arms between the arm carrying the tracing stylus and the arm carrying the reproducing tool or point. I also provide an attachment Specification of'Letters Patent. i

' Patent dAug".'?,-1917.

ingpoint or tool and themeans bywhich it may be brought into contact with the work. w thout necessitating a movement of the pant ographic levers themselves while permitting such .nicety in the regulation. of the movement of said point as will insure uniformity in the operative engagement of the tool or. point with the work irrespective of the number of times that it may be removed therefrom.

, By the mechanism used for bringing the I tool or point into contact with the work, I am enabled to secure the desired engagement of the tool or point with the work througha controlling mechanism actuated, if desired, by the foot of the operator, the controlling means being such as to avoid any distortion of the reproducing mecha nism in case of excessive pressure applied to the controlling means.

In using a machine, made in accordance with my invention, for producing lettered plates for printing purposes, the text of the plate is first laid out by hand upon a strip of paper and the master type is set-with relation to the layout upon this strip.

To adapt a machine for Work of this port a tracing stylus, and a work tool or point, parallel connecting bars having their opposite ends connected to said first named levers respectively, -means connecting said pivotal arm with one of said cross-bars at a point intermediate said pantog'raphic levers, a work-bed and a table for the master or pattern; and in such other novel features of construction and combination of parts as are hereinafter set forth and described and more particularly pointed out in the claims hereto appended.

' Referring to the drawmgs:

Figure 1 is a side elevation of a machine embodying my invention;

Fig.- 2 is a view in perspective of the upper part of the machine;

Fig. 3 is a plan view of the machine;

Fig. 4 is a detail view in perspectlve of that pantographic lever whlch supports the work toolor point;

Fig. 5 is a view in perspective of a portion of the table for the master or pattern, and the actuatin means for varymg the operative. effect 0 the pantographic mechanism' v Fig. 6 is a plan'view of the pattern table brokenaway upon different levels to show the means whereby movement 18 lmparted to the work-bed to vary the operative efiect of the pantographic mechanism;

Fig. 7 is a perspective view of the sald mechanism; and

Fig. 8 is a view showing the various operative eflects which may be secured upon the machine.

Like letters refer to like parts through the several views.

In the embodiment of my invention shown in the drawings, 1 indicates the pedestal of a machine having a bed 2 having a longitudinal slot 3 therein. Supported at the rear of this bed is a vertical post 1, and at the forward edge of said bed is a post 5 for the pattern table for the master or pattern and the parts appurtenant thereto.

Carried by the post 5 is a channeled plate 6 in which is mounted a slidingcross-bar 7, carrying a plurality of pillars 8 to which a pattern supporting table 9 is firmly attached. Pivotally supported from the pillars 8.-- is a plurality of arms 10 carrying a laterally swinging arm rest 11 for facilitating,the

operation of the machine. Slidably mounted upon the bed frame 12 carrying a vertical sleeve. 13 in which is mounted a column 14 adapted to support the work-bed and parts appurtenant thereto The bore of the sleeve 13 is in register with the slot 3 in the bed 2 so as to permit vertical movement of the column 14. Said column is provided with a rack .15 in mesh with which is a gear (not shown) mounted upon the shaft 16. Said shaft also carries a holding mechanism as the pawl and ratchet mechanism 17. I also use a set screw 18 carried by said column to supplement the action of the pawl and ratchet mechanism 17 in holding the column 14 in any adjusted position andincidentally locking it in the sleeve in a manner to avoid any looseness of said column in said sleeve.

The table 2 carries a rack 19 extending longitudinally of the machine, in mesh with which is a gear (not shown) carried by the .shaft 20, which also carries a pawl and .hereinafter described gives great operative range to the machine while affording a rigidity of structure calculated to minimize or eliminate such vibrations as would lead to inaccuracy in the reproduction.

In the further description of the case, I shall consider separately the pantographic mechanism; the work tool or point supporting mechanism; the pattern supporting table structure, and the mechanism for varying the character of the reproduction as distinguished from a mere change of scale.

In describing the pantographic mechanism, I shall, to avoid confusion, designate the arms or bars carrying the work tool or point, and the tracing stylus as pantographic levers, and the other arms or bars completing the parallelogram, as connecting bars. i

.The pantographic mechanism comprises two extensible pantographic levers adapted respectively to carry a work tool or point,

- and the tracing stylus. The lever carrying the work tool or point, comprises the two

sections

22 and 23, one of which (22) has an elongated slot 24 therein to permit movement of the other section 23 relative thereto.

provided with a block 25 slidably mounted upon the section 22, which block supports the gear 26 in mesh with a rack 27 upon the said section 22. Said block is also provided with a set screw 28 by means of which it may be firmly set in any adjusted position.

The other end of the section 23 carries a disgtanc'e stud 29, the upper end of which is reduced. and formsa close sliding fit with the slot 24, a set screw 30 being provided to form a tight bondbetween the end of the section 23 and the section 22 when it has been suitably adjusted. The'bar 23 carries the work tool or point supporting mechanism which will be more fully described hereinafter.

The lever carrying the tracing stylus comprises two

sections

31 and 32, the first of which is provided with an elongated slot 33 similar to the slot 24 and the latter of which sections carries a block 34 provided with a gear 35 cooperating with a rack 36 upon the section 31 and a set screw 37, which parts are all similar in construction to the block 25 and its appurtenances. The bar 32 is provided with a distance stud, 38 and.

30 carried by the section 23.

clamp screw 39 similar in function and construction to the stud 29 and clamp screws The end of the section 32 is extended beyond the stud 38, however,said extended end having a vertical bearing 40 thereinfor the tracing stylus 41, which may be of any desired construction.

The expansible pantographic levers hereadjustable stop 55 by means of which the z tofore described extend parallel with eachat the rear ends thereof by in said head after the other and are capable of such extension or contraction, as to length, as-to permit .accurate variation in the scale or reproduction.

The

lever sections

22 and 31 are connected the connecting bar 42; and intermediate said bar and the slotted end of said levers, by a second con necting bar 43 parallel with the bar 42. The

connecting bars 42--43 are pivotally connected with the pantographic levers and are of a stiffness to avoid any springiness there- 1n durmg the operation of the machine.

The

leve'r sections

22 and 31 and the bar- 43. are provided with graduated lines as shown to insure'uniformity in the adjust,

ment .ofsaid levers and saidcross-bar when.

of reproduction.

Carried by the bracket 4 -is ,a stiffened arm 44 one end of which is pivotally mounted for movement about a vertical axis in said bracket and theother .end of Which has an enlarged head 45 in which the connecting bar- 43 is slidably mounted. Said setting the -machine for any desired scale enlarged head 45 carries a gear46 in mesh.

with a rack 47 upon the bar 43. Said head 45 also carries a set screw 48 by means of which said bar may be firmly secured withnism has been'set.

pantographic mecha- By the construction described, I provide a rigid pantographic lever system which.

will insure absolute accuracyin the reproduction, and which may be readily adjusted to vary the scale of such reproduction.

' ball-bearings in the To insure the desired. firm movement of the pantographic levers and connecting bars as well as of the swinging lever 44, I use, various connections, wherever possible.

Carried by and forming a part of the lever section 23 is a block 49 in which is the table 9. This form ofdogis old and well known in this art. In"'reproducing. words, I preferably provide a master plate.

arm 50 may be set to determine the extent of penetration of the tool 51 in the work'plate.

This resultis secured by limiting the oscillatory movement of the arrn50 under control-of the magnet. By raising the stop the and the tool is given rectilinear movement, the upper end of said chuck being mounted.

in an opening 57 in the arm23 to' insure this movement of said chuck:

which electrical connection Thechuck 52 is spaced away from the distance stud 29 to an extent sufiicient to bring said chuck in axial alinement with the pivot of the arm 44, when the various lever arms,

and-connecting bars, are set at zero thus permitting theadjustment of the machine so that the movement of thestylus 41 will have no operativeefi'ect upon thework tool or point.

The pattern'supporting table 9 is pm- 'vided with suitable-means, as the adjustable dogs 58', for securing the master or pattern plate in. position upon said tablewhile permitting it to be conveniently andquickly shifted .from place to place thereon. Said dogs 58 are provided with screw clampsas.

shown, which clamps engage said dogs and pass through laterally extending slots in containing the entire alphabet, the plate being shifted to "bring different letters as remounted upon horizontal pivots armrking" arm 50 adapted to support the .work tool or point 51 lay-means of a chuck 52 mounted upon pivots parallel with the pivots of'said arm 50. Carried by the other end of said arm 50 is an electro-magnet 53 which serves as a counterweight for nor-mall} raising the tool out of engagement with the work-plate and also as an actuating means forbrmgingsaid tool into operative engagement with said plate. This magnet has an elongated core 54 projecting through an opening in.

the lever section 23 to serve as a guide for said magnet. Carrled by the arm 23 is an q'uired into the desired operative relation.

That side of the table positioned toward the work-bed is elevated slightlyto forma platen 59 for a paper strip, and at the opposite ends of .said platen are springnclips 60 adapted to hold said strip'firmly inplace -upon said platen. These clips'are provided with a stemprojecting-through the table andf'acted upon on' theunder sideof said table by a spring 61 shown clearly in Fig. 5.

The mechanisms heretofore described are operative to reproduce upon a reduced scale any character represented by the pattern or master. The construction of the work-table support is as heretofore stated sucadmit of the support being adjuste cally and longitudinally of the m and to permit a lateral adjustment of this support, I so mount the work, table itself upon thissupporting structure as to per rnit the surface bearing the work plate toibe iso' dition, I so construct the work bed that it.

maybe moved to any desired extent while the pantographic mechanism is in operation, thus modifying the operative effect of the work tool or point so as to secure the desired distortion or variation of the character or letter reproduced.

To permit the desired actuation of the machine, I provide, in conjunction with a universally movable work-tool or point, a

' work bed universally movable upon a single plane; and provide means operative from the tracing stylus whereby simultaneous movement will be imparted to the work tool or point and the work-bed. The mechanism which I prefer to employ is so constructed that it may be so set as to have no operativeefi ect upon the work bed, or as to secure any of the desired variations in the reproduction. I preferably so construct the controlling means for actuating said mechanism that when it is not desired to distort or vary the reproduction, said controlling means may be thrown out of the operative relation to the stylus point and thus permit the machine to be actuated as freely as though no such mechanism were used upon the machine. By a construction such as that herein shown and described, the desired variation in the character of the reproduction may be secured without any variance in the adjustment of the pantographic mechanism.

. To permit the desired movement of the work bed, I attach to the column 14 an immovable frame 62 having therein run-ways 63 extending laterally of the machine. Mounted upon said frame is a carriage 64: having laterally extending run-ways 65 upon the under side thereof registering with the run-ways 63 upon the frame 62. Ballbearings 66 are positioned in and between said runways at separated points, so as to give a steady support for said carriage. The run-

ways

63 and 65 are preferably V- shaped in cross-section. The carriage 64: is provided with run-ways 67 upon the upper surface thereof which run-ways extend perpendicularly to the run-ways 63 upon frame 62, or longitudinally of the machine. Superimposed upon the carriage 64 is a second carriage 68 having run-ways 69 upon. the under side thereof registering with the runways (11". Said carriage moulded on the menses carriage 64 by means of the ball-bearings 7 0 seated in and between the run-ways 6! and 69.

The work table '21 itself is supported upon the carriage 68 and is capable of movement laterally of the machine independently of the carriage 64. To secure this independent movement, I provide the car" riage 68 with the V-shaped track 72 at the back thereof and the fiat track 78 at the front thereof. Carried by the carriage 68 is a gear 74: mounted upon a screw threaded shaft 75 by means of which it may be retated. I also mount upon said shaft a set screw 76 by means of which the gear 7e in properly placing the reproduction upon the work plate. The work plate proper, I have indicated at 79.

Mounted in a bracket80 is a rotatable shaft 81 moving about a, vertical axis and carrying at the top thereof a T-shaped fitting 82 having perpendicularly arranged keepers formed by grooves therein, one of said grooves 83, extending laterally of the machine and the other 84 extending longi tudinally of the machine. Extending above 1 the groove 84s is a strap or housing 85. Slidably mounted in the grooves 83 is bracket 86 provided with a point bearing 87 upon the upper forward edge thereof. Gotiperating with said bracket 86 is an arm 88 connected with the carriage 68. To compensate for any slight structural inaccuracy in the said arm 88 and also to insure the proper engagement of said arm wlth the bearing 87, I preferably mount said arm W upon said carriage by means of horizontal pivots 89 and force said arm into engagement with said hearing by means of the spring 90. It will be observed that if the bearing 87 be so adjusted as to extend in axial alinement with the shaft 81 movement of the fitting 82 will have no operative effect upon said arm 88 or'its carriage 68,

but that if said arm 86 be adjusted toward or'away from this position, so as to be out w.

of alinement with said shaft 81, the oscillatorymovement of said shaft will result in longitudinal movement pf the carriage 68 through the stresses applied thereto through the arm 88.

Carried by one side face of the carriage 68 is a charmeled plate 61 having mounted therein a bracket fitting 92. lVIjounted upon said bracket is an arm provided with the bearing fill seated in the groove 8i. Said arm is preferably mounted upon horizontal pivots as shown. Said fitting 92 is slotted as shown, so as to be capable of being set-in any adjusted position by means of the set screw 92 passing through said slot and engaging the plate 91.* The channeled plate 91 is provided with. graduations as shown so that the fitting 92 may be accurately adjusted. With respect to this construction, it wilLbe observed that when the bearing 94 ,Is positioned so as to be in alinement with the axis of the shaft 81, the rotary movement of this shaft will have no "operative effect Y upon the carriage 68 but that if said arm 93 be adjusted longitudinally of'the machine in either direction, oscillatory movement of said shaft 81 will through the T-shaped fitting 82 impart lateral movement to' the carriage 64 and also to the carriage 68 and work table 71; It-will be observed that by the construction shown, the work table 71 may bev allowed to remain perfectly .sta-

' ment, according to the adjustment of the tionary while the pantographic mechanism is operative or may be caused to have lateral movement or longitudinal movement, or

simultaneous lateral and longitudinal moveactuation of the pantographic-mechanism.

This means for placing the said work table under the control of the tracing stylus,-preferably comprises a crank shaft 95 having I thereon a crank arm 96 connected by a link 97 with a crank arm 98 upon said shaft 81. The shaft 95 isprovided with a plurality of brackets 99 in which is mounted a shaft 100 having pivotally mounted thereon a frame 101 carrying a contact bar 102 adapted to above the table 9, holding said" rollers 103 out of engagement with the master or gpat-T.

tern plate and the work strip upon the platen 59; i

The shaft 95 normal forward thrust to the bar 102 and thus cause said bar to follow the stylus u on.-

its return movement afterhaving been isplacedby a direct movement under said gaged by saidscrew 97, so as to permit elon- 'gation or shortening of said link in accordance with the adjustment of the frame 12 or column 14. j

The electro-magnet 53 may be energized is provided with meansfas a pendulous counterweight 112, to impart a,

from any desired source of electrical supply v such as the battery 105, the circuit leading Y from this battery 'andincluding the magnet being controlled in any desired manner. Preferably I connect one of the battery terminals 106 with the pedestal '1 of the ma- I chine and the otherterminal 107 with one of the binding posts 56. The other binding post I connect with an insulated contact108 carried by a depressible treadle 1109, so that the circuit. from the battery may be closed by the foot of the operator. I also provide a second depressible treadlellO mounted upon the opposite side of the machine, which treadle carries an insulated contact v111 also connected with'the same battery terminal 107, which is connected with the contact Y 108.

any other means for closing the circuit to This arrangement is one merely of convenience, however, and in' fact;

the magnet may be used without departing "from the spirit and scope ofthe invention. I

The operation of the. herein. described H mechanism is substantially as follows:

A work plate 79, which may consist of a metal plate, a lithographic stone, a plate 'of glass, 'or a sheet of any desired material, is mounted upon the work table 71 and the said table is adjusted vertically, longitudinally or laterally of the machine as required to bring the desired portion of the plate within the operative range of the work tool or point51. If vertical adjustment is required, I: i

this is secured through theactuation of the- ,gear shaft 16, and rack 15, the'setscrew 18 downward movement of thecolumn 14, and

' reset when the table is at the desired height,

and pinion mechanism '19-20 and the lateral adjustment by means of the rack an be engaged by' the tracing stylus. 'The/ pinion mechanism 7 47 8. 'frame 101 is supported by rollers 103 hear;

ing upon tracks 104 positioned upon and imparted to the reproducing point 51, re sults from the oscillation of the arm 44 about its point of pivotal connection with the The longitudinal component of movement bracket 4* while the lateral component of motion results from the oscillation of the pantographic levers about the point of pivotal connection thereof with the connecting bar 43, the connecting bar 42 compelling straight line in the reproduction or a curved I line on any radius other than of the axis of "and defining this oscillatory movement. A

106" being released to permit "the upward or Y adjustment is secured by means of the rack the arm 44 would result from. a simultaneous oscillatory movement of both the arm 44 and the said pantographic levers Before'the tracing stylus is-moved about the pattern, it isnecessary to set the work tool or point so as to secure the desired degree of penetration thereof, or bringit into the desired contact with the work plate. This is done byclosing the circuit to the magnet 53 and adjustingtool 51 in its chuck 52, and setting the stop 55 so as to define the extension oroscillatory movement of the oscillatory arm 50. W hen the tool is so set I and it is desired to begin work, either treadle .109 or 110 is depressed to close the circuit to energize the magnet to cause it and the end of the arm 50 upon which the magnet is mounted to move upwardly and bring the tool into engagement with the Work plate 79.

If it is desired to reproduce a line, of let-' ters,'-the word or words are lead out upon a strip of paper (see Fig. 5), which strip-is placed upon the platen 59 with the ends thereof projecting beneath the clips 60 and the tracks 104. When the strip is so placed, it is smoothed out and the clips are released so as to permit their spring 61.to close said clips upon the paper and thus hold it in any desired position upon'said platen. The letters upon the master or pattern corresponding with the succeeding letters laid out on the strip are then brought consecutively into the desired relation and each letter is traced,

thus securing the desired sequence of letters upon the reproduction as well as the desired spacing thereof.

Assuming that it is desired to vary the scale of reproduction, it is necessary to vary the effective leverage of one of the pantographic levers, relative to the other as well as the eii'ective leverage of the pivotal supporting arm 44, which leverage, under all conditions, must, to secure accuracy in the reproduction, be the same as that of the lever 23. In constructing the machine, the relative efiective leverage of the

sections

23 and 32 is determined-but this leverage may be varied by shifting either .or both sections with relation to the point of its or their pivotal support. The effective leverage of the arm 44, as to its operative effect upon the work/tool or point, is determined by the distance between the axis of the pivotal support of said arm and the. axis of the point of pivotal connection between the connecting bar 43 and the lever section 22, which, to secure the preservation of accuracy in the reproduction must be the same as the distance between the work tool and said point of pivotal connection between the section 22 and the connecting bar 43. Hence, to varythe scale of reproduction, it is necessary to not only vary the effective leverage of either or both of the pantographic levers, but also the ef fective leverage of the arm 44-. To avoid ,ces

skewing of the reproduction, it is necessary to ad ust the section 23 and the bar 43 to the same extent. This may be done by means of the blocks 25 and the enlarged head 45 and the parts appurtenant thereto, the lever sectlon 32 being also capable of adjustment by its block 34. The various graduated scales aid in securing exactitude in the adjustment.

Irrespective of any adjustment of the pantographic levers, the sections 22 and3l n;

always have the same radiusor the same effective leverage. Hence, the scale of reproduction w1ll be determined by the relative leverages of the

sections

23 and 32, and

any variance in the scale of reproduction re vsults from a variance in the effective leverages of said last named sections. it will thus be observed that adjustment for scale may be secured by a movement of either of said

lever sections

23 or 32 in either direction; or the movement of both of said levers in the same or in opposite, directions. If it be desired to increase the scale of reproduction, this may be done by moving the section 23 so that the end thereof carrying the work tool will move away from the bar 43 or the section 32 may be moved so that the end thereof carrying the tracing stylus will move toward said bar 43 or both said sections may be shifted, section 23 away a from and section 32 toward said bar. If, however, it be desired to reduce the scale of reproduction, the section 23 may alone be shifted'in the opposite direction or toward the bar 43; or the section 32 may be shifted away from the bar 43; or said sections may be both shifted, the section 23 toward and the section 32 away from, said bar 43, or said levers may be moved in the same direction and to the same or tea variable extent toward the bar 43. As long as the shortest effective leverage of the section 32 is greater than must be similar and equal adjustment of the bar 43 toward or from the fixed axis of the supporting arm 44 in order to preserve accuracy in the dimensions, relative to those of that of the master or pattern. When the

sections

23 and 32 have been adjusted to the" desired extent, the bar 43 is shifted toward or from the axis of the arm 44 to the same extent as the movement of the section 22 the said levers and said bars are locked in their adjusted position. By this adjustment 7 for example,

. nal movement of the stylus it will be observed that the point of pivotal connection between the bar 43 and the sec tion 22 is shifted with relation to the point of pivotal support of the arms 44 to the same extent that the work tool or point 51 is shifted with relation to the point or pivotal connection of the section 22 and connecting bar 43. While the amount and direction of movement of the section 32 may be the same as, or differ from that of the section 23, it will be observed that the effective leverage of the arm 32 as compared with that of the arm 23 after any adjustment differs from the effective leverage before the adjustment, thus resulting in the desired variance in the scale of the reproduction. If the section 23 or the

sections

23 and 32 and the connecting bar 43 be set at zero, itwill be found that the axis of the pivotal connection between the bar 43 and the pantographic lever section, will be in exact alinement with the axis of the arm 44, and that the point 51- will also be in alinement withsaid axis, so that any movement of the stylus point will have no operative'efiect upon the work tool or point.

It will be observed that when reproducing the pattern or master to scale, the work table 71 remains in a fixed position and that the work tool or point 51 has movement with relation thereto. It will also be observed that the pantographic levers each have one arm having the same, and a fixed effective leverage, and that any variance in the scale of reproduction results from a variance in the effective leverage of the other arm.

Under ordinary conditions when reproducing to scale, the bar l02'will be swun downwardly below the plane of the table 9 so as to be outof the operative range of the tracing stylus. If, however, it be desired to vary the character of the reproduction, as, to condense, extend or tilt, or incline it, this bar is-raised and the wheels 103 are placed upon the tracks 104. .VVhen the parts are in this position the counterweight the bar with it the T-shaped fitting 83. V The pro-, jection of the bar 102 across the table 9 will result in the movement ofthis bar to the same extent, and in the same direction lon itudinally of the machine, as the longitudin following the pattern or master.

If it be desired to condense the letter or make the vertical dimension or height smaller relatively to the lateral dimension or width, as compared with the master, the bracket 86 is set with the bearing 87 between the axis of the shaft 81 and the carriage 68. When so set the oscillation of the shaft 81 in either direction will impart longitudinal movement to said carriage 68 simultaneously with the longitudinal movement of the work 112 will impart a forward thrust to. 102 and-oscillate the shaft 81 and? tool but to a considerable less extent and thus shorten the vertical, or height. lines described by said tool upon the \H'Jl'li plate to the extent determined by the amount of the longitudinal movement of the carriage under the arm 88. The extent of this condensation may be controlled by the quantity of inward movement of the bracket 86. If, however, it be desired to extend the letter, or make the vertical dimension or height thereof relatively greater than the lateral dimension as compared with these dimensions in the mas ter or pattern, the bracket 86 may be shifted away from the carriage 68 with the resultant effect that oscillatory movement of the shaft 81 will impart movement to said carriage counter to the movement of the work tool and thus increase the length of the lines by an extent measured by the quantity of movement of the said carr age.

If it be desired, however, to incline the design or letters backwardly or to the left of Fig. 3 in the drawings, the fitting 92 may be shifted rearwardly of the machine thus bringing the point bearing 94 thereof rearwardly of the axis of the shaft 81. The oscillatory movement of the shaft 81 uponthe rearward movement of the stylus will then impart to carriage 64 a lateral movement to the right which movement will give the desired inclination or tilt to the letter. The extent ofthis inclination will be determined by the extent of movement of the fitting 92, the farther this is moved toward the rear of the machine, the greater being the degree of inclination of the reproduction. Likewise by shiftin the fitting 92 toward the front of the mac the shaft 81 will upon rearward movement of the stylus move the work plate to the left of Fig, 3 and give a backward tilt or inclination to the letters. If it be desired to both incline the letters and extend. or condense same, both the bracket 86 and the fitting 92 may b adjusted thus imparting to the work table a simultaneous nal movement and modifying the reproduction accordingly. By usingga'ge lines, ac-

curacy in these adjustments may be secured,

of any adjustment made ine, the oscillatory movement of lateral and longitudiconnection with'this machine is immaterial to the invention. It may be constructed merely to remove resist from the surface of a printingplate, to actuallyengrave on the plate, or otherwise remove metal, or the sur It may-be so reproduction face of a lithographic stone.

formed as to merely outline the without penetrating the surface of the plate. In fact any old and well-known form of tool may be used in connection with the mechanism herein described, the tool itself form mg no part of the invention.

It will be observed that the pivotal supports for the

lever sections

22 and 31 are disposed upon the same radius or the axis of the pivotal support and the arm 44; and that absolute accuracy in the reproduction results from-the constant leverage of said

sections

22 and 31 irrespective of the scale for which-the pantographic levers are ad .claim as new and justed.

It is not my intention to limit the invention to the precis details of construction shown in the drawings, it being apparent that such may be varied without departing from the spirlt and scope of my invention.

Having described the invention what I desire to have protected by Letters Patent is:

1. A pantographic engraving machine embodying therein a fixed support, an arm pro jectlng radially of and having one end there-j of pivotally mounted upon said support, parallel pantographic levers or bars adapted respectively to support a tracing stylus and to support a work tool or point, parallel connecting bars having their opposite ends pivotally connected to said pantographic levers, respectively, means fixedly connecting the other end of said pivotal arm with oneof I "said pantographic levers, so

point intermediate a work bedand table for the master or pattern.

2. A pantographic engraving machine embodying therein a fixed support, anarm projecting radially of and having one end thereof pivotally mounted upon, said support, parallel pantographic levers or bars adapted respectively to support a tracing stylus and to support a work tool or point, parallel connecting bars having their opposite ends pivotally connected to said pantographic levers respectively, means connecting the said connecting bars at a other end of said pivotal arm with one of and a table for parallel pantographic levers or bars adapted respectively to support a tracing stylus and to support a work tool or point, parallel connecting bars having their opposite ends pivotally connected to said pantographic levers respectively, means connecting the other end of-said pivotal arm with one of said connecting bars at a point intermediate said pantograph1c levers, means for varying lel connecting and of the connecting bar,

the operative leverage of the pantographic lever carrying the, tracing stylus whereby the scale of reproduction may be varied, a

work bed and a table for the master or pattern.

4. A pantographic engraving machine embodying therein a fixed support, an arm projecting radially of and having one end thereof pivotally mounted upon, said support,

parallel pantographic levers or bars adapt to support a tracing stylus a work tool or point, paralbars having, their opposite ends pivotally connected to. said pantographic levers respectively, means connectng the other end of said pivotal arm with ed respectively, and to support one of said connecting-bars at a point intermediate said pantographic levers, means whereby the scale of reproduction may be varied comprising means for varying the operative leverage of the pantographlc 1e- ,ver carrying the work tool orpoint, means for varying the operative leverage of the pantographic lever carrying the tracing stylus, and means for varying the operative leverage of said pivotally supported arm, a work bed and a table for themaster or pattern. Y

5. A pantographic engraving machine embodying therein otally mounted upon said support, parallel pantographic levers, bars having their opposite ends pivotally a fixed support, an arm piv-- parallel connecting 1 connected to said pantographic levers re I spectively, means whereby one of said connecting bars isfslidably mounted upon said pivotal arm at a point intermediate said pantographic levers,

of which is pivotally connected with said connecting bars and the other of which is slidably mounted upon said first named sec-' one of said panto- I graphic levers comprising two sections, one I tion and is adapted to support a work tool or point whereby said connecting bars and said lever section carrying the work tool or point maybe similarly adjusted to vary the scale of the reproduction, the other of said pantographic levers being adapted to support a tracing stylus, a work bed and a table for the master or pattern.

6. A pantographic engraving machine embodying therein a fixed support, an arm pivotally mounted upon said support, parallel pantographic levers or bars, parallel connecting bars having their opposite ends connected to said pantographic levers respectively, means connecting said pivotal arm with one of said connecting bars at a point intermediate'said pantographic levers, one of said pantographic levers comprising two sections one of which is connected with said connecting bars and the other of which is slidably mounted upon said first named section and is adapted to support a tracing stylus whereby the scale of reproduction may be varied, a work bedand a table for the master or pattern.

7. A pantographic engraving machine embodying therein a fixed support, an arm pivotally mounted upon said support, parallel pantographic levers, parallel connecting bars having their opposite ends pivotally connected to said pantographic levers, respectively, means whereby one of said" connecting bars is slidably mounted upon said pivotal arm at a point intermediate said pantographic levers, one of said pantographic levers comprising two sections, one of which is pivotally connected with said connecting bars and the other of which is slidably mounted upon said first named section and is adapted to support a work tool or point, the other of said levers comprising two sections one of which is connected with said connecting bars and the other of which is slidably mounted upon said first named section and is adapted to support a tracin stylus whereby said connecting bars and said levers may be adjusted to vary the operative leverage of said supporting arm and said levers respectively, to vary the scale of reproduction, a work bed and a table for the master or pattern. I

8. A pantographic engraving machine em bodying therein a fixed support, an arm pivotally mounted upon said support, parallel pantographic'levers or bars, parallel connecting bars having their opposite ends pivotally connected to said pantographic levers respectively, means connecting said pivotal arm with one of said connecting bars at a point intermediate said antographic levers, means carried by one of said levers for sup;-' porting a tracing stylus, means carried by' the other of said levers for supporting a work tool, comprising an oscillatory arm, horizontal pivots connecting said arm and .said lever, a support for a work tool carried by one end of said arm, means operative on the other end of said arm whereby it may be oscillated to engage or disengage a work- I tool from the work,a work bed and a table,

for the master or pattern.

9. A pantographic engraving machine embodying therein a fixed support, an arm pivotally mounted upon said support, parallel pantographic levers or bars, parallel connecting bars having their opposite ends piv otally connected to said first named levers respectively, means connecting said pivotalarm with one of said connecting bars at a point intermediate said pantographic levers, means carried by one of said levers for supporting a tracing stylus, means carried by the other of said levers for supporting a work tool, comprising an oscillatory arm, horizontal pivots connecting sa d arm and said lever, a support for a work tool carried pivotally connected to said pantographic 1e vers respectively, means connecting said pivotal arm with one of said connecting bars at a point intermediate said pantographic levers, means carried by one of said levers for supporting a tracing stylus, means carried by the other of said levers for supporting a work tool, comprising .an oscillatory arm, horizontal pivots connecting said arm and said lever, a support'for a work tool carried by one end of said arm, an electro-magnet mounted upon the other end of said arm, means controlling the circuit tosaid magnet, a work bed and a table for the master or pattern.

11. A pantographic engraving machine embodying therein a fixed support, an arm pivotally mounted upon said support, paror disengage a worr allel pantographic levers or bars, parallel connecting bars having their opposite ends said lever, and a pivotal support for a work tool carried byone end of said arm, said lever above said work tool support having an I I opening therein through which said work. a

tool support. is adapted to pass to insure a rectilineal movement of said tool, an" electro-magnet mounted upon the other end of said arm, means controlling the circuit to I said magnet, a work bed and a table" for the master or pattern. i W

12. A pantographic engraving machine embodying therein a fixed support, an arm pivotally'mounted upon said support,' parallel pantographic levers, parallel connecting bars having their opposite ends pivotally connected to said pantographic levers "respectively, an enlarged head upon said arm whereby one of saidconnecting bars is slidably supported by said arm, a rack and gear mechanism carried by said enlarged head a and said bar, locking means whereby said bar may be secured in any adjusted position 1 with relation to said arm, said enlarged with relation to carriedby said block and the section upon levers one of said anto ra hic levers com- I u a n 0 I prising two sections, one of which is pivotally connected with said connecting bars and has an elongated slot therein and the other of which is slidable with relation to the other and provided with a block slidably mounted upon said first named section, a rack and gear mechanism carried by said block and said first named section, means for lockin said block upon said first named section, tfie other of said levers comprising two sections one of which is connected with said connecting bars andhas an elongated slot therein and the other of which is"'slidable the other and provided with mounted upon the cooperata block slidably a rack and gear mechanism ing lever section,

which it slides, meansfor locking said block upon said last named section, a stud carried by each of said slidable sections, a set screw with both of said table for the master or pattern.

passing through an elongated slot in eachof said fixed sections and engaging the stud on the other section, the 'slidable section of one tedto support a work tool or point and t e slidable section of the other of said levers being ada ted to support a tracing stylus, a work be anda 13. In a pantographic engravingmachine,

' a pantographic mechanism comprising a bar movable about a fixed axis, two levers pivotally mounted at different radial points of said bar, a second bar parallel. with said first named bar and pivotally connected with both of said levers, a work tool or point support carried by one of said levers, a tracing stylus support carried by the other of said levers, means whereby the work tool or point support may be adjusted with relation to the point of pivotal support of its supporting le- -ver, and means whereby said levers and said first named bar may be moved toward or from saidfixed axis, to vary the scale of reproduction, a work bed and a table for the masteror pattern.-

14:. In a pantographic engraving machine, a pantographic mechanism, comprising a bar movable about a fixed axis, two levers pivotally mounted at different radial points of said bar, a second bar parallel with said first named bar and pivotally connected levers, a work tool or point support carried by one of said levers, a tracing stylus support carried by the other of said levers, means whereby the work tool or point support and the tracing stylus support may be independently adjusted with relation to the point of, pivotal support of its supporting lever, means whereby said levers and said first named bar may be movedtoward or from said fixed axis, to vary the scale of reproduction, a work bed and a table for the master or pattern.

1gp naeaeea 15. In a pantographic engraving machine, a pantographic mechanism comprising an arm movable about a fixed axis, a strai ht bar, means whereby said bar is slida fily mounted upon said arm, two levers pivotally mounted at different points the pivotal point of both the said levers 1n alinement radially of the axis of said arm, a work tool or point support carried by one of said levers, a tracing stylus support carried by the other of said levers, asecond bar parallel with said first named bar and pivotally connected with both of said levers,

means whereby the work tool or point support may be adjusted toward or from the point of pivotal support of its lever, means whereby the tracing stylus support may be adjusted with relation to the point of pivotal support of its supporting lever, means whereby said first named bar may be adjusted on said arm toward or from the axis of said arm, to vary the scale of reproduction, a work bed and a table for the master or pattern. a I

16. A pantogr-aphic engraving machine embodying therein a pantographic reproduclng mechanism operative upon afixed horizontal plane, a Work table, a standard, a normally stationary work table supporting frame carried by said standard, means of said bar with whereby said frame may be adjusted lon i- I the machlne, means whereby embodying therein a pantographic reproduc- I ing mechanism operatlve zontal plane, a work table, a work support ing plate mounted thereon, means whereby said plate may be moved laterally of said table, a standard, a stationary work table supporting frame carried by said standard, means whereby said frame may be adjusted toward and from said pantographic reproducing mechanism, and a pattern supporting table.

18. A pantographic engraving machine embodying therein a pantographic reproducing mechanism operative upon a fixed horizontal plane, arpattern supporting table, a work table occupyinga plane parallel with that upon which said reproducing mechanism is operative, a work supportin plate movably mounted upon said work ta 1e and upon a plane parallel therewith, means whereby lineal movement may be imparted to said table, means whereby said plate may be moved at right angles to the direction of the plane thereof.

-' 19. A pantographic engraving machine thereln a pantographic reproducembodying ing mechanism adapted to reproduce a masframe, means operatively connected to said table and adapted to be actuated by said reproducingmechanismwhereby a lineal horizontal movement may: be imparted to said ter or pattern to scale, said mechanism ineluding a tracing stylus supportand a work tool support, a work tablesupporting frame fixedly mounted adjacent said reproducing mechanism, a work table, means whereby said table is-movably mounted upon said work table in the same direction as, simultaneously'with, but-to 'a lesser degree than% the movement of the work tool su port '0 v I said reproducing mechanism, to diminish one of the dimensions of the reproduction relatively to pattern.

20. A pantographic engravin machine embodying therein asppantograp ic reprothat dimension of the master or ducing mechanism adapted to, reproduce a master or pattern to scale, said mechanism including a tracing stylus supportand a work tool support, a .work table supporting r frame fixedl mounted adjacent said reproducin mec anism, a work; table, means where y said table is movably mounted upon said frame, means operatively connected to said table and adapted to be actuated by;

said reproducing mechanism' whereby a lineal horizontal movementmaybe imparted to said work table in a directlon oppositeto, simultaneously with, but to a' lesser degree than, the movement of the work tool support of said reproducing mechanism to increase one of the dimensions of the rep'ro duction, relatively to that dimension; of the tool support, a work table supporting frame. fixedly mounted adjacent said mechanism, a .45

master or pattern.

21. A pantographic engraving machine embodying therein a pantographic reproducing' mechanism adapted to reproduce a master or. pattern to scale, said mechanismjneluding a tracing stylus support and a work work supporting table, means whereby said work'supporting table is mcunted to have lineal movement longitudinally of saidframe and means operatively connected to said table and adapted to be actuated by said reproducing mechanism whereby a horizontal movement may be imparted to said work table in the same direction as, simul-' taneously with, but to a lesser degree than, the movement of" the work tool support of said reproducing mechanism, to diminish one of the dimensions of the reproduction relatively to that dimension of the master or pattern.

' includin Iiism, a work supporting table, means where- I by said workv supporting table is mounted to have movement longitudinally of said frame and means operatively connected to said table and adapted to be actuated by said reproducing .mechanism whereby a horizontal movement may be imparted to said work table in a direction opposite to, simultaneously with, but to a'lesser degree than, the movement of the'work tool sup.-

port of said reproducing mechanism to intion' relatively to that dimension of the i master or pattern. I

23. A pantographic engravin "machine embodying therein a pantograp ic. reproducing mechanism adapted to reproduce a master or pattern to scale, said mechanism including .a tracing stylus support and a work tool support, a work supporting frame [fixedly mounted adjacent sai mechanlsm, a work, table, means whereby said table is adapted to have lineal movement laterally of the machine, and means ogeratively connected to said table and a apltedto be actuated by said reproducing mec anism whereby a horizontal movement crease one of the dimensions of the reproducreproducing laterally of the machine may be imparted to saidwork table simultaneously with the longitudinal movement of the work tool su port of said reproducing mechanism to 1111b the reproduction. a

24. A pantographic engraving machine. I

embodying therein a 'pantographic' reproducing mechanism adapted to. reproduce a master or patternto scale, said mechanism work too support, a work sup orting frame fixedly mounted adjacent said reproducing mechanism, a work table, means whereby said table-is adapted to have lineal move-' ment laterally of the machine, means oper;

atively connected to saidtable and adapted to be actuated b "said reproducing mechanism whereby a orizontal movement laterally of the machine may be imparted to said work table simultaneously with the longitudinal movement of the work tool support of said reproducing mechanism to tilt the reproduction and means whereby the. direction a tracing stylus support and a of said lateral, movement may be regulated.

25. A pantographic engravin ducing mechanism adapted-to reproduce a master or pattern to scale, said mechanism including a tracing stylus support, a work .tool support, a work table supforting frame fixedly mounted adjacent sai reproducing mechanism, a work table, means whereby said table is movably mounted to have movement upon said frame longitudinally of the machine a movable fitting mounted adjacent machine embodying therein a pantograp ic reprosaid table, a laterally extending keeper on said fitting a bracket adjustably mounted in said keeper, an arm carried by said work r 60 the machine, an oscillatory shaft a recipro- I table and operatively engaging said bracket,

of the machine, a

and means operatively connected with said fitting and adapted to be actuated by said reproducing mechanism whereby sald bracket may 'be actuated to vary the height of the reproduction.

26. A pantographic engraving machine embodying therein a pantographic reproducing mechanism adapted to reproduce a master or pattern to scale, including a tracing stylus support and a work tool sup ort, a work support normally occupying a xed position, support whereby it may be moved laterally movable fitting having a longitudinally extending keeper, an arm 'carriedrby said work support, and opera and means whereby simultaneous longitudi- 'nal and lateral movement may be imparted to said work bed for varying the height of and tilting the reproduction.

28'. A pantographic engraving machine embodying therein a pantographic reproducing mechanism adaptedto reproduce a master or pattern to scale, including a tracing stylu'ssupport and a work tool support, a work bed normally occupying a fixed position, supporting means for said bed where- I by it may be moved longitudinally of the machine, an oscillatory shaft a reciprocatory bar adapted to be moved under the control of the tracing stylus, a crank shaft, connections between said crank shaft and said-bar, connections between said crank shaft and said oscillatory shaft and connections be- I tween said oscillatory shaft and said work bed whereby said work bedwill have lineal movement simultaneously with the movement of said work tool.

29. A pantographic engraving machine embodying therein a pantographic reproducing mechanism adapted to reproduce a master or pattern to scale, including a tracing stylus support and a work tool support, a work'bed normally occupying. a fixed position, supporting means for said work bed whereby it may be moved longitudinally of catory bar adaptedto be moved under the control of the tracing stylus, a crank shaft,

pivotal connections between said crank shaft and said bar, whereby said bar may be re-.''

supporting means for said work" said keeper, means whereby e adjusted longitudinally of f therein a pantographic repro 1,2a5,ees

moved from within the operative range of the stylus, connections between said crank shaft and said oscillatory shaft, and connections:between said oscillatory shaft and said work bed whereby said supporting means for said table will have lineal movement simultaneously with the movement of said Work tool.

30. A pantographic engraving machine embodying therein a pantographic reproducing mechanism adapted to reproduce a master or pattern to scale, including a tracing stylus support and a work tool support, a work support normally occupying a fixed position, supporting means for said work upport, comprising two superimposed-carriages movable respectively in perpendicular lines whereby said work support may be moved both longitudinally and laterally of the machine, an oscillatory shaft, a fitting carried and movable therewith having a laterally and a longitudinally extending keeper therein, a bracket adjustably mounted in said laterally extending keeper, an arm' carried by one of said carriages, and operatively engaging said bracket, an arm carried by said other carriage and opera tively engaging said longitudinal keeper, connections adjustable longitudinally of the machine, between said last named arm and its carriage, a reciprocatory bar adapted to be. moved under the control of the tracing stylus, and connections between said bar and said shaft carrying said fitting whereby said fitting may be actuated to impart longitudinal or lateral movement, or both longitudinal and lateral movement to said support simultaneously with the actuation of said reproducing mechanism to vary the' height or to tilt; or to both vary the height of, and to tilt the reproduction.

31. A pantographic engraving machine embodying therein a pantographic reproducing mechanism, a support for the Work plate, a support for the master or pattern comprising a table having a raised platen at the rear edge thereof, spring pressed clips at the opposite ends of said platen whereby a strip of paper may be held in relation to said table and a plurality of dogs attached adjacent the forward edge of said table whereby a pattern ormasterplate may be adjustably connected with said table with its rear edge thereof bearing against the edge of said platen.

32. A pantographic engraving machine embodying therein a pantographic reproducing mechanism, a support for the work plate, a support for the master or attern comprising a table having a raise platen at the rear edge thereof, spring pressed clips at the opposite ends of said platen whereby a strip of paper may be held in relation to said table, a plurality of dogs attached adjacent the forward edge of said table where- "comprising a table having a raised. platen adjacent the forward. edge of saidtable whereby apattern or master'platemay be port for, thework plate, v

I 33. A pantograp'hic engraving machine embodying therein ao'pantographic.repro ducing mechanism, asupport for the vworkv by a pattern or master plate may bead may be adjusted toward and from said supplate, a support for the master or pattern at the rear edge thereof, spring pressed clips at the opposite ends of said platen where by a strip of paper may be held in relation to said table, a plurality of dogsattachedf embodying therein a work bed, a pantographic mechanism operative in a fixed i} ,adjustably connected with said table with pillars supporting said table and a a rality of brackets mounted upon said pi ars and an arm rest carried by: said brackets] whereby said rest may be movedjtoward and i its rear edge thereof bearing against'the edge of-said platema plurality ofvertical 5 adapted to oscillate said from said table. w 34:. A pantographic embodying therein apanto'graphic reproducing mechanism, comprising parallel pantographic levers, each consisting of a fixed' section and a section movable relatively thereto, a connecting bar having its opposite ends pivotally connected to' the fixed secand having its opposite nected to the'fixed. section of each of said levers,'a pivotal support at one end of said engraving machine I Witnesses:

parallel with said first named connecting bar ends pivotally confirst ,named connecting bar whereby said "tion of each of said levers, a connecting bar bar in its entirety has movement about a .fix'ed axis and means whereby the movable sections of each of said levers may be adjusted upon the fixed section,

stylus support carried by. one of said movablesections and'a reproducing tool or point support carried by the other ofwsaid movable sections. 7 l 35. A pantographi'c engraving machine plane above said workbedand a work tool ing' therein a rocking lever, an electromagnet a tracing arm to move the work tool support toward or from said work bedand means for controlling the circuit to said magnet. I

In witness whereof I hereunto aflix my 1 signature in the presence of two subscribing witnesses, this 8th day of June, 1914.

' I WILLIAMS. EATON.

F. T. WEnTwoR'rH, Cmmcn FRANCE.