US425929A - And samuel w - Google Patents

Description

r 5 SheetsSheet 1. G. G. BRU'QKNER & S W. BALGH.

(No Model.)

ENGRAVING MACHINE.

Patented Apr. ,3

lnvanmrs Charles C. Bruckner 5 annual WE alch W I EhEirAHnrng Witnesses,

(No Model.)

5 Sheets-Sheet 3. 0'. G. BRUGKNER & S. W. BALOI-I.

ENGRAVING MACHINE.

N0. 425,929. Patented Apr. 15, 1890.

Wibne 55 ES,

* (No Model.) 5 Sheets-Sheet 4.

G. G. BRUGKNER 85 S. W. BALGH.

ENGRAVING MACHINE.

- No. 425,929. Patent-ed Apr. 15, 1890.

#w m W Hu ,mh m 5 .1 may JQM wmm C5 5 ,r. E 5 M 5 E w w u /O d (No Model.) 4 5 Sheets-Sheet 5. C. G. BRUOKNER W. BALOH.

' E-NGRAVING M HINE.

No. 425,929. Patented Apr. 8,9 0

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Witness 25, I 2 MM. mvgnmrs, 235%??? theirAHurrg UNITED STATES PATENT OFFI E,

CHARLES C. BRUCKNER, OF NEW YORK, AND SAMUEL Yr BALCl-I, OF

YONKERS, NEW YORK.

ENGRAVlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 425,929, dated April 15, 1890..

Application filed July 9,

To all whom it may concern:

Be it known that we, CHARLES C. BRUOK- NEH and SAM EL W. BALOH, citizens of the United States, and residents, respectively, of the city of New York and State of New York, and of the city of Yonkers, county of WVestchester, and State of New York, have invented new and useful Improvements in Engraving- Maehines, of which the following is a specification.

Our invention consists of improvements in machines for engraving with electrical control. The general features of such a machine to which our improvements are applicable are, first, an'engraving-tool mounted with an electro-magnet, by which it may be made to bear upon the work to be engraved or lifted therefrom under the control of an electric current; second, means whereby the engraving-tool may be made to traverse the work to be engraved in parallel lines, as illustrated in the construction of lathes, planers, and shapers; third, a tracing-point to traverse the raised metallic surface of the design to be copied; fourth, means similar to that applicable to the engraving-tool, whereby the tracing-point is made to traverse in parallel lines over the design in unison withthe traversing of the engraving-tool over the work to be e11- graved; fifth, electric connection by which the tracing-point in traversing the design makes and breaks an electric currentwhich communicates control to the engraving-tech One of the objects of our invention is to provide an engraving-machine that will operate in the most'direct manner and cover the range of work required of such machines by jewelers. To this end we have provided a table having a reciprocating motion and adapted to hold such jewelers goods as have a fiat surface to be engraved,or on which the surface within the limits to be engraved does not curve materiallyas, for example, such objects as a watch-case, a tray, or a waterpiteher. Besides such objects as above mentioned and all intermediate in size, we have made provision by separate devices for three classes of circular work that may be illustrated by three examples, as engraving on the inside surface of a finger-ring, engraving 1889. Serial No. 316,906. (No model.)

found to have several disadvantages. The

.work usually engraved on the interior surface being much smaller in diameter than work that is engraved on its exterior surface, the surface speeds imparted to them differed greatly, so as to require considerable adj ustment in other parts to compensate therefor. This disadvantage we have removed in our invention by providing the chucks for holding rings for inside engraving and for holding goblets for outside engraving with separate gears, through which they are to derive their motion, and making the gears attached to each proportional to the average work for which each is to be used. In former machines the internal surface against which it may be desirable to have the engraving-tool to act moved in a contrary direction to the external surface, and therefore required elsewhere on the machine means for reversing the direction of motion. This reversal of direction we have attained in our machine by mounting the chucks for these two classes of work in different positions, so that'the gear on the ring-chuck will have its under surface in mesh with the rack on the reciprocating table, while the gear 011 the chuck for outside work when placed in position has its upper surface in mesh with the rack. Furthermore, an interior surface against which the engravingtool operated would be below the axis, while the exterior surface to be acted upon would be above the axis, thereby occasioning provision for considerable vertical adjustment of the engraving-tool, if the same axis is used for both classes of work. This occasion for considerable vertical adjustment we have removed in our construction by placing the axis about which work to be engraved on the inside surface is revolved above the axis used for work tobe engraved on its outside surface, so that the su rfaces of either class of work where the tool acts will come as near as may be to the same position on the machine. Former ma- This we have These and minor features we-have incorchineshave located these chucks behind the I table, where work held in them is not so easily seen and adjusted. We have placed these in front of the table, where all work can be seen by the operator while it is being engraved, and have mounted them as attachments, so that they may be removed when not in use, that nothing may be between the operator and work placed upon the table. We have found that the speed at which a machine of this character may be operated is limited by the rate at which the tracing-point passes over the design, by which it makes and breaksthe electric current, and is independent of the size to which the machine may be adjusted to copy. To obtain this uniformity of speed of tracing for all adjustments with a uniform movement on the part of the operator, we have coupled the hand-lever directly to the tracing mech anism and made its leverage adjustable to the engraving mechanism. We have sought,

furthermore, to so construct our machine that it will admit of great facility of adjustment,

To this end means have been devised to insure the proper centering of the work and the. copy and to make the strokes of the tracing and engraving parts even each way from the center. By employing separate electric currents for the circuit through the tracing-point and for the electro-magnet controlling the engraving-tool, and-connecting them in their times of action by means of a relay, we are enabled to use such currents as are particularly adapted to each purpose. By the use of a suitable relay and switches thezcurrent through the. tracing-point may be made to either make or break the current through the magnet controlling the engraving-tool, by which the engraving tool may be either drawn from the work when the tracer is in contact and the design copied in relief, or the tool released when the design is touched by the tracer and the copy cut, in the work.

porated in our machine, as will more fully appear in the detailed description and claims.

In the accompanying drawings, Figure 1 is a plan view of our invention. h Fig. 2 is a front view with the portion at the right in section. Fig. 31s a plan .view of mechanism underneath the copy-slide, consisting of a sliding rod withnuts and collar, and its means of independent support from the wooden base. Figs.

4 to 7, which are drawn to a smaller scale,

illustrate various positions of the copy-slide and the sliding rod. Fig.8 showsin section the adjustable connection between the handleverand the table. Fig. 9 is a side view of our invention with section along the line X X in Fig. 1. Fig. 10 isa viewin the same di-;

rection of the portion removed in the above sect-ion. Figs. 11 to 14 are diagrams showing the courses taken by the electric currents in thevarious positions of the switches. Figs.

15 to 17 show the auxiliary lever carried by the. hand-lever. Figs. 18 and .19 show the hand-lever. Figs. 2 0 and 21 show the fulcrumpiece forsupporting the hand-lever and auxiliarylever. Figs. 22 and 23 are respectively side and front views showing the attachment for engraving on the inside surface of rings. Fig. 24 is a side view in section of the attachment for engravingin a circle on fiat surfaces, and Figs. 25 and 26 are side and front views of the attachment for engraving on exterior cylindrical surfaces. Fig. 27 is an enlarged sectional view of the tracing device.

The base.The main elements of our machine are mounted on a base of wood or other insulating material for the purpose of keeping the electric currents from passing between them, except as hereinafter described.

It is obvious, however, that the insulation posing a non-conducting substance underneath each of the parts secured to it. y

The main frame.-The main frame 2 is of cast-iron and supports three slides. One of these is the engraving-table 3 and carries the work to be engraved. One is the. tool-slide 4 and carries the engraving-tool, and the third is the copy-slide 5 and has attached to it the holder for the copy. The engravingtable is parallel with the copy-slide and at right angles to the tool-slide. A hole drilled at 6 supports the fulcrum-piece-for the lever, by means of which the engraving-table and copy-slide are moved. A shaft 7' is made fast in this frame to be used in supporting the attachments for circular work.

3 is used to support the work to be engraved.

A rack Sis attached to the front of this table for the purpose of imparting motion to the attachments used with the machine for en graving in a circle.

Under the rear edge of j this table is a clamping-piece 9, Fig. 22, that holds a form 10, to be used for engraving in wavy or otherwise curved lines, as shown in Fig. 1. This clamping-piece is also used to carry the pawl for feeding the tool-slide. A

rack 13 is attached to the front edge of the table for the purpose of imparting motion to m attachments used with the machine for engraving on a circle. At one end of the table a dovetail groove is planed at rightangles to the directionin which the table slides. Adjustably in this groove is clamped'a block carrying a pin, through which the table receives motion from the hand-lever. Clampuprights 14 and 15, shaped. as angle-pieces,

slide over the ends of the table. These are held down, adjoining the work to be engraved, at their lower edges by hooks 16, 17, 18, and 19, cast on them and reaching under the edges of the table. down the work, 20 and 21, are also shaped as Clamps for holding angle-pieces, and are similarly provided with hooks 22, 23, 24, and 25, which engage over the edges of the clamp-uprights. One of the branches of the angle of each of these clamps presses the work. The other branch in each is provided with a screw 26 and 27, tapped through it and bearing against the clamp'-up-- rights. By the above construction the turning of one screw while it brings a clamp to bear upon the work also produces a cramping action that secures it from slipping on the upright, and also binds. the upright, so that it will not slip upon the table. On comparing the range in size of the articles to be secured to the table by these clamping means it was noticed that high work requiring the clamps to be slid up toward the top of the clamp-uprights was never as narrow as the narrowest-that was held with the clamps low down. WVe have therefore found that by in-v clinin g the clamp-uprights from the center, so that the clamps will be set for wider work when they are near the top of the uprights than when clamping close down to the table, as narrow or short articles may be clamped as will be required, while wider articles, when they are high, may be exposed for engraving between the tips of the clamps than would otherwise be possible without lengthening the table,and thereby increasing the size of the machine. Symmetry of construction abouta center lineY Y is observed in adapting the means for holding work to the table. Vhen the table isin the middle of its stroke, this line will beunder the engraving-tool, and when the clamps are either nearest-together or farthest apart they will be equally distant from the center. 7

The i00Z-sZt'de.The tool-slide serves to carry the engraving-tool across the Work reciprocated under it by the table. From the under side of the slide a pin 28 projects and serves to impart motion to the tracing-point. A projection 29 is threaded for a feed-screw 30. This projection also serves as abutment for a spring 31, which keeps the slide as far forward as other elements will permit. To oppose this sliding forward, the end of the feed screw 32 abuts against the former 10, carried by the table, so that as the table reciprocatesthe tool-slide advances and recedes according to the contour of the former. A ratchetwheel 33, secured to the feed-screw, is revolved intermittently by the pawl 11 at each reciprocation of the engraving-table. It will therefore be seen that by the above arrangement the one tool-slide receives from the reciprocation of the engraving-table a vibratory motion in accord with the curve of a former and an intermittently-advancing motion. An angle-plate 34 is mounted on the tool-slide, so that it can slide in the direction of the feed motion and be clamped by the screw 35.

The engraving-head 36 slides vertically on this angle-plate and is secured in position by ing on its lower end a roller 43, which rests on the surface of the work, being made to press downward by the weight of the lever and the action of the spring 44 for the purpose of maintaining a uniform distance from of work to be engraved on the table.

of the levers need besupported from and hinged to the fixed head if the other is hinged to the lever so supported, for suchaconstruction would not change their functions, as above described. WVhen the surface to be engraved is level or the character of the work does not require the use of the roller 43, it may be removed and the magnet-lever supported by the nut 47 and screw 48.

Inside-engraving attachment.For the purpose of engraving on the concave surface of finger-rings we have provided'the mechanism illustrated in Figs. 22 and 23, and made it of such construction that it may be readily detached, so as not to obstruct the machine when used for other classes of work. A casting 49 is attached to the main frame by the shaft 7 and supports a ring-chuck 50, with its axis above the surface of the engraving-table, so that while the surface of the ring, against which the engraving-tool acts, is below the axis it is still above the surface of the table, so as not to require additionalvertical adj ustment of the engraving-head to that required by the range In the ring-chuck 50 is a taper hole, into which two jaws 51 and 52 are drawn by the action of the spring 53 pressing against the nut 54 on the On the periphery of this chuck are gear-teeth, meshing on the under side with the rack 8,

attached to the engraving-table. It will be apparent that the surface of the ring acted upon by the tool with the above construction is moved in'the same direction as the table,

so that designs wrought by the machine upon the concave ring-surface will be similar, and

not reversed, to those which would be copied on work mounted on the table.

Outside -cngrcwt'ng atta-c7zments.A faceplate 56, Figs. 25 and 26, against which work can be clamped by the rods 57 and 58 and the clamp-bar 59, is placed upon the shaft 7 when an outside cylindrical surface is-to be en graved. This face-plate is provided with a gear 60, attached to it, and which, being independent of the gear used with the ring-chuck, can be of larger sizeand in proportion to the work usually held on the face-plate, while the gear used with the ring-chuck is of a smaller size and proportional to the work it has to revolve. The upper side of the gear attached to this face-plate is in mesh with the rack on the table, so that the face-plate for a given direction of motion of the table will revolve in a contrary direction from the ring-chuck. An inspection of the construction will show IOL that the surface of the work held by the face platethat is, acted on by the tool-is moved in the same direction as the table, as was the case with the ring-chuck. When the ruled engraving-lines are to be traced upon a flat surface in a circle, we employ the mechanism illustrated in Fig. 24, consist-ing of a supporting-piece 61, attached to the main frame by the shaft 7, and carrying in a horizontal plane the above-described face-plate with its gear meshing into the rack on the table.

.The hand-Zever.-The hand-lever 62 (shown separately with its parts in Figs. to 21) is used to impart motion to the copy-slide and the engraving-table. It is fulcrumed at 6 to the main frame through the fulcrum-piece 63' and attached to the copy-slide by the pin .64. Since this pin moves in a straight line and its distance from the fulcrum is variable, this variation is provided for in the lever by makinga sliding joint for it in the'fulcrum-piece.

This lever is also employed to impart motion.

to the engraving-table, and in order that the speed with which this table is moved may be adjustable the connecting-pin 65 between the lever and the table is set in a block 66, adjustable toward or from the fulcrum of the lever by sliding in a groove planed in the table at right angles-to its sliding motion. Fig. 8 shows this block and pin in section. ,A pointed screw 67, tapped through this block, enters a conical hole in the pin 65. This hole is a little lower down than the screw, so that the point of the screw will bear against the upper side of the conical hole, and by wedging the pin upward against the table will bind the block in position. On account of a will align automatically.

difliculty found in securing the necessary alignment with the other parts of the lever its lower end is made ball-shaped, and a sleeve 68 is free to'rock slightly on it and fitting a hole in the lever, so that the bearing-surface will be equal to that of a plain pin, while it In order that the adjustable point of attachment from the-table to the lever may slide along the latter, an auxiliary lever 69 (shown separately in Figs. 15 to 17) is used to impart motion to the table. This lever is supported at its two ends by the main lever and the fulcrum-piece andis free to slide to and from the fulcrum, while 'it is carried by the. main lever in its angular motion. At its center is the point of attachment to the engraving-table through the pin and block 66. This compounding of the lever is required because of the different amount of adjustment of the points of attachment to the two slides to and from the fulcrum when they are at unequal distances therefrom and impart unequal motions to the two slides. By this construction in providing adjustment betweenthe elements of the lever and the fulcrum, so that link-connections usual between levers and parts moved by them may be avoided, thepoints of connection to the slides are maintained at the same proportionate distance from the fulcrum at all parts of the stroke and a uniform relative movement of the two slides obtained.

The copy-slt'da-The copy-slide 5 carries a vise 70. This vise is secured to the slide by jaw of the vise contains in a recess in it two racks 73 and 74, meshing in a pinion 75, and so arranged that the pins 76 and 7 7, attached tothese racks and projecting through slots in the Vise-jaws, will always be at equal distancesfrom the center. When these pins are brought to bear against the opposite ends of a line of type placed in the vise, it will be properly centered. Under the slide 5 adjustable means have been provided to limit the 'motionof the slide in each direction. A rod 78 is supported in one or more bearings 79 and 80, through which it is free to slide under the slide 5 and in the same direction. A collar81 is fast on this rod, and when it comes in contact with the bearing 80 limits the motion in one direction. A nut 82, provided with a check-nut 83, limits the motion of the a I rod in the opposite direction by striking the end of the main frame 2. Cast on the under side of the slide 5 is a projection 84, that plays.

main frame, as shown in Fig. 5.- During the motion of the slide to the right the operation is similar, as illustratedsuccessively in Figs. 6 and 7. As the screwing forward or backward of the nut increases or diminishes the play of the rod alike each way, it will be apparent that this mechanism, therefore, provides means at one point for adjusting the motion of the, slide equally at each end of its throw, so that it will stop at an equal distance each way from its central position. The collar 81 is guided and kept from turning by a wire 85, which passes loosely through its edge parallel to the rod 78. Since the collar is fast to this rod, the latter will be kept from turning, so that the nuts 82 and 83 may be conveniently screwed upon it. The bearings 79 and 80 are notconnected to the main frame, but are framed together and mounted on the wooden base, so that they, with the rod 78 and the nuts on it, may be in separate electrical connection from the main frame and its slide 5. The collar 81 is of insulating material, so that when in contact with the projection on the slide it will not estabtrical connection remains broken. hen the slide has moved to the left as far as it will travel and has been stopped by the nut 82 coming in contact with the end of the main framefelectrical connection is here es tablished and remains during the return of the slide to the right for the first half of the stroke, as shown in Fig. 6, when the projectiongstrikes against the nut, as shown in Fig. 2, and also makes electrical connection between the above elements at this point and maintains itduring the second half of the stroke, Fig. 7, when the first connection is broken. The above-described construction serves, therefore, to close an electric circuit during the entire movement of the slide in one direction and to open'it during the movement in the contrary direction.

The tracing clem'cc.A stand 86 supports a rod 87 free to slide in it. A-hole is drilled near one end of this rod, and in it slides a carrier 88, with the tracing device. (Shown in e11- larged section in Fig. 27.) This carrier is free to slide in the hole in the rod and rests with its weight upon the design, rising and falling with any unevenness of the raised surface. In the center of this carrier is a rod 89, having a tracing-wheel 9O journaled in its end to roll over the design. This wheel is not essential to the other features of the construction, for it may be dispensed with and the end of the rod 89 made to rest upon and trace over the design. A set-screw 91 adjusts the amount that the rod 89 or its tracing-wheel projects below the carrier. The lower end of the carrier has a shield 92, insulated from it by rubber collars 93 and 94. This shield is sufficiently wide to prevent the carrier from dropping between the raised parts of the design,while on account of its insulation it will not establish electrical connection. A pin 95, driven in the rod 87, serves to keep it from revolving and to attach the spring 96. A lever 97 is mounted on the base 98 by a swivelconnection 99, which serves as the fulcrum, andis adjustable along the base on which it is mounted, so that the leverage may be varied. One end of this lever is attached to the tool-slide by the pin 28. The other end bears against the end of the rod 87, carrying the tracing device. The end of this rod pressedby the lever hasan insulating-tip 100, so that electrical connection between the parts carrying the tracing device and the main frame will not be made except between the tracing device and the design. The function of the spring 96 is to keep the rod 87 in contact with the lever97. By the motion derived through this lever from the tool-slide the tracing device is made to feed across the design as the engraving-tool feeds across the work, but in a reversed direction and with increased or diminished speed, according to the position of the fulcrum 99.

Electrical circuits.--Two independent currents are used inthis machine. The first is taken from the battery 101 and passes through the tracing device at its point of contact with the design. It is made of such strength that it will not burn the tracing-point or the surface of the design, and of such intensity that it will quickly respond to the contact'there made. The second battery 102 furnishes a current of sufficient strength to control the engraving-tool through the electro-rnagnet 45. During the operation of engraving the current from the first battery may be traced successively through the binding-posts 103 104, relay-coil 105, binding post, 106, stand 86, tracing device, design carried by the copyslide, the main frame, through the wire connecting at 107, binding-post 10S, and return to the battery. The wires through which this current passes are indicated in the diagrams Figs. 11 to 14 by the broken lines. The above current, which is made and broken at the tracing-point, makes and breaks the second current through the action of the relay. This second current may be traced from the battery 102 through the binding-post 109, the switch-button 110, the switch 111, either to the button 112 and the relay-post113, Figs. 11 and 13, or to the button 114 and the relay-post 115, Figs. 12 and 14:, according to the position of the switch, from either of which posts the current passes to the relay-armature 116. The effect of the first current is to close the connection of the second current here if the switch is in the position first mentioned, and to open it if it is inthe other position. From the armature the current passes to the mainframe wire 117, through the parts on this frame to the electro-magnet 15, through thismagnet, the binding-posts 118 and 119, and returning to the battery. The wires through which this current passes are indicated in the diagrams by the full lines. The use of two currents, relay with two contact-posts and switch, makes it possible to copy the design either in relief, as will be the case when the contact of the tracing-point with the design closes the current in the electro-magnet and lifts the tool away, or to sink the design in the work, as will be the case when the contact of the tracing-point opens the current in the electro-magnet and drops the tool on the work. This change is effected entirely by the shift-ing of a switch.

' During the motion of the engraving-table and the copy-slide to the right the engraving-tool is not turned inthe direction to cut, and means have been devised to hold the tool away from the work when the motion is in this direction. This is done automatically by keeping the current through the tool-magnet by means of the circuit-closing mechanism underneath the copy-slide. This circuit-closing mechanism may be used to close the first circuit and secure the closing of the second circuit through thetool-magnet by means of the relay, as in the diagrams Figs. 11 and 12; or it mayclose the second circuit through the tool-magnet directly, as in the diagrams Figs. 13 and 14., according as the switch 120 is .binations of their various positions.

turned to the left or to the" right. It was shown above that the switch 111 directed the second current so that it would be either closed or opened, as desired, by the closing of the first current. When the first circuit is closed by the mechanism under the copyslide, the effect on the secondcircuit must be to close it, so as to reverse the efiect of the switch 111. A second switch 121 is mounted on the opposite end of the wooden switch-lever 122. The diagrams Figs. 11 to 14 illusthe second current. This passage-way for the current is from the circuit-closing mechanism through the switch 120, the switch-buttons, and the switch. 121 to the battery. In Figs. 13 and 14 the circuit-closing mechanism provides the passage-way for the second current independent of its being provided in the relay, and thus insures the lifting of the engraving-tool.

Having thus described our invention, we cla1m as new and desire to secure by Letters Patent- 1. The combination, with a table for supporting work, of clamp-uprights provided with hooks reaching under the parallel edges of the table, and clamp angle-pieces, each consisting of two branches, one having a surface adapted to press down against the work to be clamped and the other carrying a thumbscrew to press against the clamp-upright, and hooks engaging the parallel edges of the uprights, substantially as and for the purpose set forth.

2. The combination, with a table for supporting work, of clamp-uprights mounted upon it so that they may be slid to and from each other thereon and inclined from -each other at their upper extremities, clamps mounted on these inclined uprights so that they may be slid up and down thereon and project from them toward each other, and clamp-screws, substantially as and for the purpose set forth.

3. The combination, with a main frame supporting and guiding horizontally on its top an engraving-table and a tool-slide, said toolslide being opposite the side of said table and with its direction of motion at right angles thereto, of a feed-screw threaded to said tool-slide and provided with a ratchet-wheel actuated by a pawl carried by the table, and aformer carried by said table, against which the feed-screw abuts, substantially as and for ble, of an engraving-tool supported by a lever from a vertically-adjustable head, a ring-' chuck,'and a supporting-casting attached .to I

the main frame and carrying said chuck above the surface of the en gravin g-table, substantially as and for the purpose set forth.

6. The combination, withan engraving-table, of an engraving-tool, a'lever by which it is supported, an electroqnagnet by which it is controlled, a ring-chuck furnished with jaws for holding work and provided on its periphery with teeth meshing on the under table, and supports for the-several elements,

so that the rack and the engraving-tool will act upon the same side of the axis of the chuck and the workit carries, substantially as and for the purpose set forth.:

7. The combination, with two slides having parallel motions, of a compound hand-lever consisting of a main and auxiliary lever, to which these slides are hinged, these levers having a sliding connection, and one or both sliding in a fulcrum-piece, by which they are free to slide independently to or from the fulcrum as constrained by their hinge-connections with the slides, while they are united in their angular motion, together with a frame affording suitable supports for the slides and the fulcrum-piece, substantially as and for the purpose set forth.

8. In an engraving-machine, a copy-holder consisting of a vise for clamping the design, in combination with a pinion and racks meshing on opposite sides of said pinion and having pins projecting from them through slots in the vise-jaw, substantially as and for the purpose set forth.

ing slide, a rod having a limited sliding motion parallel to the slide, a collar fast to the 1 rod, a projection from the slide positioned so as to arrest its motion through contact with the collar, and a nut adjustable on the rod in po- 10. In an engraving-machine, a reciprocat ing slide having aprojection playingbetween an insulating-collar and a metallic nut on a sliding rod, one or more bearings supporting 6 side with a rack attached: to the engravingthis rod separately fromthemain frame supporting the slide, a part of the, main frame positioned soas .to arrest the motion of the rod through contact with said metallic nut on said rod, and establish electrical connection when the slide reaches the end of its motion in the direction in which its projection pushes against the insulating-collar, in combination with battery and circuit-wires, substantially as set forth.

11. In an engraving-machine, a tracing device consisting of a metallic wheel, in combination with a metallic design, an electromagnet, engraving-lever,battery, and circuitwires, whereby ,the. electric current is conducted between said metallic wheel and metallic design and through said electro-magnet, substantially as set forth.

12. In an engraving-machine, a tracing device comprising a rod or wire89, in combination with a metallic design, a metallic carrier 88 in electrical connection with this rod, and a metallic shield 92 in contact with the design,

but insulated from said carrier and rod, and the whole mounted with a free vertical motion, in combination with an electro-magnet, engraving-lever, battery, and circuit-wires, substantially as set forth.

13. In an engraving-machine, the combination of a tracing-point, engraving-lever, electro-magnet for Vibrating said lever, relay, two batteries or equivalent sources of electrical energy having different quality or strength, and twoelectrical circuits from said batteries, one through the tracing-point and relay-coil and the other through the relay-armature and engraving-lever magnet, substantially as and for the purpose set forth.

14. .In an engraving-machine, the combination of a tracing-point, engraving-lever, electro-magnet for vibrating said lever, relay with posts 113 and 115, switch 111, and two electrical circuits, one through the tracing-point and relay-coil and the other through the switch 111, posts 113 and 115, relay-armature, and engraving-lever magnet, substantially as and'for the purpose set forth.

15. In an engraving-machine, the combination'of a tracing-point, engraving-lever, electro-magnet for Vibrating said lever, relay, reciprocating slide, circuit-closing mechanism operated therefrom, switch 120, and two electrical circuits, one through the tracing-point and relay-coil and. the other. through the relay-armature and engraving lever magnet, together with suitable electrical connections, whereby either circuit, according to the position of the switch, may be also closed by the circuit-closing mechanism operated from the reciprocating slide, substantially as and for the purpose set forth.

CHAS. o. BRUOKNER. SAMUEL w. BALCH.

WVitnesses for Bruckner:

THos. 0. Moon, EDWIN W. NEFF.

Witnesses for Balch:

BENJ. ADRIANCE, G. A. SOHELLENGER.

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