US1462682A - Engraving machine - Google Patents

Description

July 24, 1.923.

' c. c; BRucKNER ENGRAVING MACHINE Original Filed Aug. 17 1920 5 Sheets-Sheet l July 24, 1923;

, 1,462,682 C. C. BRUCKNER ENGRAVING MACHINE Original le A 17. 1920 5 Sheets-Sheet 2 almi 4 July' 24, 1923. 1 1,462,682 c. c. BRUCKNER ENGRAVING MACHINE Original Filed A g. 17/1 26 5 Sheets-sheaf rs al foz n ei y '7 July.2 4, 1923. 1,462,682

C- C. BRUCKNER ENGRAVING MACHINE 0riginal Filed Aug. 17. 1920 5 Sheets-Sheet 4;

a ugmtogwi-I Y 1.462.682" c. c. BRUCKNER v ENGRAVING MACHINE July 24, 1923.

bri inal Filed-Aug. 17, 1920 '5. Shets-Sheet 5- Patented July 24, 1923.

cairn!) STATES treat an 111" etch.

CHARLES C. BRUCKNEB, OF JERSEY CITF, NEW JERSEY, ASSIGNOR T0 ERUGKNER MFG. 00., INC., A CORPORATION OF DELAWARE.

ENGRAVING MACHINE.

Application filed August 17, 1920, Serial No. 404,247. Renewed May 26, 1922. Serial lto. 563,980.

To all whom it may concern:

Be it known that I, CHARLES C. Bauer.- NER, a citizen of the United States, and a resident of Jersey Cit in the county of Hudson and State of blew Jersey, have invented certain new and useful Improve.-

ments in Engraving Machines, of which the;

following is a full, clear, and exact description.

This invention relates to engraving machines, and has for its object to provide a' machine by which commercial engraving, such as practiced by jewelers, card-plate engravers, etc., can be done entirely automatically by unskilled operators, and in fact without attention by the operator other than placing the work in the machine and setting movement into'and out of cutting engage-' ment with the work, the movement of the tool to engrave thedesired design being effected electrically from a pattern over which a stylus is moved in coordination with the movement of the work.

The machine of that patent produced satisfactory work when properly manipulated, but required constant attention from the operator as well as skill in setting and operating the machine. The machine of my present application is much simplified in construction and is provided with an operating motor and connections whereby after the machine is once set in motion it will continue in operation until the design has been completely engraved, stoppin automatically when the work is finishe This feature of the machine is particularlyimportant in engraving in relief, that is, with the design raised in a sunken field. With this class of work the machine will automatically stop when the field beyond the design has been cut equal in width to the field at the side where the work was commenced.

One of the principal disadvantages heretofore prohibitive of the successful commercializing and general use of machines of this type has been the fact that in all such machines, the electrical operation of the undue cutting tool has been efi'ected by makin or breaking the tool controlling electric cir uit at the point of contact between the tracer and the pattern. This necessarily resulted in sparking at-the contact oint with consequent burning and injuryboth to tracer and pattern. A specific object of this invention therefore is the provision of such circuit controlling meansat a point. entirely removed from the point at which the tracer and pattern contact. At the same time, means is provided for the elimination of friction betwee n the pattern and tracer.

Another importantfeature of the present machine is .the J, provision of devices for facilitating the centerin of the machine with regard to the wor to be engraved. These devices permit the design, without previous measurement, to be laced with its center at any predetermine point on the -work to be engraved, that is to say, the .operator has merely to determine the center novel features of construction and design which will be hereinafter described and.

pointed out in the appended claims.

In the drawings 1 have illustrated a preferred form of my improved machine, and

in the said drawings,

Figure 1 is a plan view thereof;

Fig. 2 is a front elevation of the machine shown in Fig. 1;

Fi 3 is an end elevation looking from the right of Fig. 1;

Figs. 4 and 5 are side and front elevations, respectively, on an enlarged scale of a portion of the slide feed mechanism;

Figs. 6, 7 and 8 are detail views of the stylus and connected parts;

Figs.,9, 10 and 11 are detail views on an enlarged scale of the design or type-holding mechanism;

Fig. 12 is a detail view of the automatic stop mechanism whereby the machine is caused to stop after the design is completely en aved;

. ig. 13 is a diagrammatic view showing the electrical connections;

a drop forged plate with stiffening ribs so as to be light and at the same time sufiiciently' rigid to maintain the parts in fixed relative positions. The base late 1 is of general shape as shown in 1g. 1, one end of'the cross member of the T being longer than the other and providing a base for the electric motor 2 from which the machine is operated. The main portion of the base reciprocatl work table 3, while the other arm of the carries the type support 4 and associated parts.

The machine comprises a air of guide rods 5 extending longitudinal y of the main portion of the base plate and carrying a sliding su port or carriage 6 which forms the base 0 a post 7 upon which the cutting tool 8 and its actuating mechanism are mounted for vertical adjustment by means of a gear 9 meshing with a rack 10 cut in the rear face of the post. The slide 6 is adjustable .along the rods 5 by means of a screw shaft 11 threaded in the rearface'of the slide and swiveled through a cross bar 12 between the rods at their rear ends.

The support 13 for the reciprocating work table is also su ported on the rods 5 near I the front ends t ereof for longitudinal adjustment the rods to and from the carri plishe by a. screw 14 threaded in the front web of the frame 13. The screw 14 is mounted at its forward end in a bearingllfi formed in the fixed frame member in w 'ch the rods 5 are supported The threaded rod 14 is provided at its exposed and with a hand wheel 17 for manually adjusting the frame 13 to position the work with respect to the tool and is also provided with an automatically operatingl mechanism for partially rotating the s aft as the en ravin progresses to move the work under t e too which mechanism will be later described. The lliland wheel 17 has a ,lslcale mark En its rip e cooperating wit a, spring nger 1 7 best shown in Figure 4, attached to the.

along top of the bearing 16. The scale mark is chine, the members being positioned to be engaged by the er when the table is centered with the cutting tool,

as will be later described.

The support. 13 consists of two spaced members extending transversely of the maconnected b suitable webs in a single rigid piece. T e upperedges of the spaced members are underknown design.

te supports the cutting mechanism and 6, this adjustment being accom-v cut as shown at 18 (Fig. 4 to provide atransverse guide track for t e feed table 3 which. is reciprocated by the electric motor 2 preferably through the driving mechanism shown herein. v

This driving mechanism comprises a worm, 19 on the motor shaft meshing with a worm wheel 20 on a shaft 21 at right angles to the motor shaft. The shaft 21 car ries a friction wheel 22 which engages the face of a. friction disk 23, the wheel 22 and disk 23 forming a chan e speed gear of well F ormc on the rear face of the disk 23 is a diametrical slideway 24 in which is adjustably supported a crank pin block 25 connected by a link 26 with the reciprocating carriage 3 whereby the rotation of the disk 23 will reciprocate the carriage along its guideway 18, the extent of movement depending on the adjustment of the crank pin in the guide way 24.

The purpose of this ad ustment is to vary the movement of the table in proportion to the size of design to be engraved on the article, and the purpose of the change speed gear is to allow a faster rotative movement to be imparted to the disk when a short reciprocating movement is imparted to the shde whereby the table may be operated at a uniform speed of movement for the purpose of securing uniform work and also to allow smaller designs to be engraved in a time prolpgrtionate to their size instead of taking t full time required for larger pieces. The disk 23 is provided with a scale mark and index finger 23 similar to the finger 17 to indicate the middle position of the table with respect to its lateral movement.

Thework table 3 preferably comprises an under part supported in the guideways 18 and an upper removable part 27 fixedly connected to the lower part when the machine is in use throu h a dove-tail slide 28 (see Fig. 2) and loc 'ng screw, not shown, so as to be detachable in order that different work tables for different t readily substituted.

its reciprocating movement, by means of an adiusting screw 30, the operation of which wi 1 be later described. The chuck 29 comprises a base having its bottom out to fit the undercut slideway 32 in the table top 27 (see Figs. 4 and 5) and an up r part 33 hinged at one side to the edge 0 vided at the other side with an elevating screw 34 whereby one edge of the chuck may be elevated when necessary to hr the surface of an irre ular piece of wor into an approximately horizontal plane. The chuck proper consists of the usual clamping ieces upported in the part 33 on the ouble the base and promeacee ing the ratchet wheel is a pawl 37 carried in fork 44 which embraces the end of a bell crank lever 38 pivoted on the stationary frame adjacent the ratchet wheel. The free end of the lever 38 is con nected through a link 39 with the core of a solenoid 40, the solenoid having in its circuit an automatic switch 41 supported on the frame of the driving gear in the manner shown particularly in Fig. 2. The switch 41 comprises three spring arms insulated from each other and from the machine frame and normally separated by their own resilience, but adapted to be brought together when engaged by the high part of a cam 42 attached to the shaft of the disk 23. The high part of the cam 42 occupies half of its circumference and is placed with relation to the position of the switch 41 so as to close the switch when the table begins its return movement, that is, the movement to the right, as shown in Fig. 1, thereby drawing the pawl back as far as permitted by the ad-' ustrnent at which it is set. The switch opens the circuit when the carriage begins its cutting movement, allowing the spring 43 to raise the arm and turn the shaft 14 through a distance equal to one or more teeth of the ratchet, thereby shifting the work with relation to the tool so that another line will be cut" on the next movement of the table. The tool is raised during the return movement of the table and lowered during the cutting movement by an electro magnet controlled by the third arm of the switch 41, as will be later described. -The stroke of the pawl 37 may be regulated in any suitable manner, for instance, by the the link 39 and the cooperating pin 45 which may be set in different holes in the link so that the downward movement of the link is limited by the position of the pin and the upward movement by the engagement of the fixed pin 46 with the under side of the fork'44. The holes in the link 39 are spaced so that each hole corresponds to one tooth of the ratchet. Thc type caw-z'er.

The type carrier 4 is supported on guide rods 50 arranged at one end of the cross piece of the base plate in parallelism with the rods 5. The carrier 4 is actuated from the carriage 13 by means of a; system of levers shown particularly in Fig. 1, one of which levers has an adjustable fulcrum whereby loosely,

both'the direction and extent of movement of the type carrier 4 with relation to the main table 13 may be varied to secure designs of difi'erent dimensions from a single set of type. The lever system shown com.- prises a lever 51 with a fixed fulcrum on the base plate in front of the main table and with one end connected to the table 13 by a link 52. The other end of the lever 51 is connected by a suitable link to a second lever 53 whose fulcrum consists of a pin or screw 54 adapted to be passed through any one of a number of holes in the lever 53 and threaded or set in one of a corresponding arrangement of holes in the base plate on opposite sides of the connection of the lever 53 with the type carrier 4.- The shifting of the fulcrum from one hole to another in either group varies the extent of movement of the type carrier and its adjustment from one side to the other of the connection with the carrier 4 changes the direction of movement of the carrier, as will be obvious.

The type carrier 4 (Figs. 9 and 10) consists essentially of a vise or clamp having one side 55 attached fixedly to the base of the carrier 4 and a movable side 56 hinged at one end to the base and provided at the other end with a pin to be engaged by a hook 57 pivoted on the base.

The pivot 58 of the lever is preferably mounted to be rotated and is provided with an eccentric forming the bearing of the hook and with a knurled head so that by turning the pin 58 the hook may be tightened to draw, the part 56 tightly against the type.

The type may be either printers type, that is, showing the letter in reverse, or may be direct reading type as shown in the drawing, depending upon whether the movement of the stylus is in the same direction as the movement of the feed table, or the reverse direction. The type is set up between the parts 55 and 56 and the latter clamped toward and away from each other and from V the center of the type carrier. After the type is centered in the carrier the screw 58 is turned to clamp them fixedly in place.

In Fig. 9 the type is shown as arranged for engraving sunken letters. Where this after which the type is centered by' type of work is done only the type need be set in the holder, for the cutting tool is active only when the stylus is passing over the raised portion of the type and hence the movement of the stylus beyond the type at each end is without efi'ect. When, however, the design is to be formed with raised letters in a sunken field I preferably use in addition to the tvpe itself, border pieces I such as shown in Fig.- 11. As here shown,

four border pieces are employed, two side pieces above and below the name. The side pieces have their edges adjacent the name out down to the same height as the field surrounding the letters, to thereby produce on each side of the type an additional border equal in width to the cut down portion 65'. The two end pieces 66 have cut out portions 66, of any shape desired and of a width equal to the width of the type plus the two portions 65'. Sunken fields are thus provided at each end of the letters, forming with the side recesses a com plete field surrounding the name and symmetrical therewith.

The stylus.

movement of the stylus and table to be altered. For this purpose the stylus is mounted for reciprocation upon a carriage which reciprocates on a guide rod 68 projecting laterally from the side of the table 3. The rod 68 works through a guide sleeve 69 supported on one of the rods 50 of the type-supporting guides for movement along the rod 50 as the table 3 is fed forward by the ratchet 36, that is to say, the rod 68 is fast to the carriage 3 and moves with it both laterally and in its forward and backward movement, while the guide 69 moves backward and forward on the rod 50 and guides the rod 68 in its lateral movement.

The carriage 70 (Figs. 6, 7 and 8) of the stylus comprises essentially a bearing sliding on the rod 68 and a pair of spaced rojections 71 on the upper side of the carnage arranged to receive between them a rock shaft 72 with its axis of oscillation perpendicular to the guide rod 68. The stylus is .attached to the rock shaft and comprises preferably an arm projecting over the type and carrying a vertical finger or feeler 67 with its end turned slightly to one side, as shown more particularly in Fig. 8, to thereby present a smooth surface to the type as the stylus is moved over the type by the reciprocation of its carriage. The stylus rests fully on the type, being partially counterbalanced by a projecting arm carrying the armature of a magnet 74 supported on the stylus carriage and connected through the same contacts of the compound switch 41 which control the carriage feed so as to be energized throughout the return stroke of the carriage when the cutter is inoperative, the effect of the magnet being obviously to raise the stylus and maintain it out of engagement with the type.

The operating connection between the feed table and the stylus carriage com- 3 tacts 82 and prises a fulcrum bar 75 projecting rigidly from the rear side of the carriage 13 and havin pivoted in its free end an operating lever 6. The forward end of the lever 76 is pivoted at 77 to, the stylus carriage and its rear end carries an adjustable slide 78' having in its upper surface a crank pin 79 working in a slot in a plate or arm 80 attached to the end of the reciprocating carriage 3.. By adjusting the slide 78 along the lever 76 the extent of movement of the stylus carriage efi'ected by the movement ofthe carriage 3 will obviously be varied,

thereby permitting designs of various sizes to be engraved from a single set of type. It will be observed from Fig. 1 that the slot in the arm 80 lies parallel with the lever 76 when the stylus is over the center of the type. By this arrangement the feed table and stylus will always be simultaneously adjusted to their center position at all positions of adjustment of the crank arm 79. That is to say, when the hand wheel 17 and the disk 23 areadjusted to the center positions indicated by their index fingers, the table 3 will be centered with the normal position of the tool and the stylus will be at the center of the type holder. For the same purpose the lever connections 51, 53, etc. between the table 3 and type-carrier 4 are proportioned so that all the holes in the lever 53 for the fulcrum pin 54 register with the corresponding holes in the base board when the hand wheel and disk are adjusted to center position. The machine will therefore produce a design of any desired size from a single set of type, with that design, whatever its size, symmetrical with the work as centered under the cutting tool when the hand wheel and disk are adjusted to the positions indicated. Y

The cutting tool.

The stylus controls the operation of the cutting tool through a. contact device carried by the shaft 72 and shown in tail in Figs. 6, 7 and 8, which contact device causes the magnet 81 of the cuttin tool to be energized and de-energized. s shown, the contact comprises a pair of insulated contacts 82, 83, supported on the stylus carriage 70 at one side of the shaft 72 in the manner shown particularly in Fig. 7 the two con- I 83 being arranged to co-operate, respectively, with two spring contact fingers 84, 85, supported on the shaft 72in the mannershown. The upper finger 84 is arrang d. to close the circuit through the contact 82 when the stylus is raised in passing over the type and to break the contact while the stylus is passing over the surface of the type block between the letters, while the lower contact 85 will close the circuit through the contact 83 when the stylus drops ofi the letters and break the circuit when the stylus is aaeaeaa raised. This double contact arrangement is provided so that the design may be formed in either raised or sunken letters from the same v shaft 72 will have noeflect.

The coil of the magnet 81 is also connected to its source of current throu h a shunt circuit 89 (see Fig. 13) passing through the lower contacts of the switch 41 to insure the cutting tool being raised on the return or idle stroke of the work table.

The cutting tool 8 is preferably supported in a chuck 91 carried on the free end of a I bell cank lever 92 as shown particularly in Fig. 3, the upper end of the bell crank carrying the armature for the magnet 81. The magnet and fulcrum of the bell crank are supported in a' box or casing 93 depending from a bracket adjustably secured to the post 7. Also enclosed in the casing is the return spring 94, for the tool cutting arm. This spring is carried by a guide rod supported in the casing 93, the spring being compressed between a fork 95 on the bell crank and an adjusting nut 96 threaded on the rod whereby the compression of the spring may be readily adjusted.

The extent of movement of the armature away from the magnet is controlled by an adjusting screw 97 threaded through the outer wall of thecasing and serving as a stop for the upper end of the bell crank. By adjusting this screw the depth of the cut effected by thetool may be readily altered.

The casing 93 is not attached directly to the bracket 8 but is connected to it for adjustment toward and from the post 7 by means of a gear and rack connection 98 (see Fig. 1) operated through a thumb nut 99 'on the shaft of the gear. Normally the casing is adjusted to its full extent toward the post 7,*in which position the cutting point of a tool'such as shown in Fig. 1 will coincide with the center of the machine with which the adjustments are symmetrical, as described above. When, however, a tool with a bent shank such as necessary with some kinds of work, as will be later described, is employed, the casing will be adjusted away from the post 9 to an extent corresponding with the offset of the cutting tool to permit the point of the cutting tool to be brought to the center of the machine;

The automatic stop device.

The machine is preferably provided with an automatic stop device to bring the machine to a stop when the engraving iscomplete This mechanism is shown particuarly in Fig. 12 and comprises a pivoted lever 100 fulcrumed on an am 101 proj r 119%. ing forwardly from the carriage 6 between the guide rods 5 the fulcrum of the arm 100 being immediately under the cutting tool in its normal position. The lever 100 is connected at its free ends to two sliding sleeves working on the two rods 5, one of the sleeves 102 lying behind the supporting hearing of the carriage 13, while the other sleeve 103 is in front of the carriage. The sleeves are connected with the lever by pin and slot connections, the arran ement being such that when one sleeve is slid along its rod the other sleeve will be moved in the opposite direction along its rod to an equal extent from the fulcrum of the lever 100, the two arms of the lever being equal. The sleeves are provided with set screws 104 by means of which they may be set in their adjusted positions. J

The sleeve 102 which lies to the rear of the table 13 carries on its" front face a pair of spring contacts 105 insulated from the The operation of the machine.

In 0 erating the machine the first step is to a just the hand wheel 17 and disk 23 to their center positions as indicated by the indexes 17 and 23 which brings the table 13 into its center position with respect tothe normal position of the tool and also adjusts the stylus and type carriage so that the point of the st us lies immediately over the center of t e ty The work will then be clamped in El: chuck 29'with the point on the work with which the design is to be symmetrical, directly .under the cutting point of the tool, the tool being readily raised and lowered by the rack and pinion 9 and 10 to facilitate the centering of the work. In centering the work with res ect to the tool the chuck may be shifte laterally back and forth'by means of the screw 30 and the tool may be adjusted back and forth through screw shaft 11 until the desired adjustment is obtained.

The hand wheel 17 will then be turned to adjust the carriage forwardly on the guide rods 5 and wlth it the stylus carriage and type carriage until the stylus lies in advance of the type to an extent at least equal to the width of the field to he cut sleeve 102 carrying the starting switch 107 will close to start the machine in motion. Under the o ation of the motor .the carriage 3 .w' be laterally reciprocated through the stroke and at the speed determined by the adjustment of the crank in 25, and the speed ar 22 and the sty us will be moved over e t pe the length of the stroke of the stylus epending upon the adjustment of the pin 79 in the slot of the arm 80. At the com 'letion of 'each reciprocation of the carriage to the right as shown in the drawings, the contact through the switch 41 will be broken by cam 42, thereby deenergizing the magnet 40, ermitting the spring 43 to elevate the bell crank 38 and adjust the screw shaft 14: throu ha partial revolution, depending upon t e length of stroke permitted by t e adjusting pins 45. The switch 41 completes also the circuit throu h the m at 74 on the stylus carriage, t ereby lifting the stylus out of contact with the type so that on the return stroke the stylus will be free of the type and the tool will be elevated by the magnet 81, the circuit through the tool magnet 81 be in closed through the lower contacts of switch 41 and shunt circuit indicated at 89 in the diagram Fi 13.

The operation 0 the screw 14 shifts the table 3 slightly to the rear to allow the tool to traverse the work in a line closely parallel with the first line of movement, the tool being raised and lowered as the contactsof its. magnet are closed and opened by the stylus in passing over the letters to thereby cut the design either in relief or in intagho, as described. The adjustment of the stop 44 varies the, distance between the lines to be cut by the tool so that closeli adjacent lines may be used in small wor or where the material is such as to re uire it. The movement of the carriage a ong its rods 5 causes an equal movement of the stylus carriage through the connection of the rod 67 with the carriage 3, and also a movement of the type carriage 4 in the same .or opposite. direction, depending u n the position of the fulcrum pin 54, w ereby the design may be vertically -either smaller or larger than the type, that is, if the type carriage moves in. the same dlrectlon .as the stylus, the relative movementof the type and stylus will not be as large as the relative movement of the work and cutting table, whereas if the movement of the type carriage is in the opposite to the rear of the center a distance equal in width to the movement in front of the center, whereby the machine will be automatically stopped with the design in all resplgcts symmetrical with the center of the wor Attachments for inc/lined work, etc.

The machine shown and described is also designed to produce an engraved design with the letters inclined to the vertical from vertical type so that vertical, inclined and back hand reproductions may be made from the same set of type. To this end the feed screw 30 is provided with a ratchet feed device which may be used when desired to produce an inclined reproduction and remain idle when a vertical reproduction is to be reproduced without removing any part from the machine. This mechanism comprises two ratchet wheels 110 and 111 with oppositely'faced teeth fixed to the shaft 30 and the end opposite the hand wheel. Supported on the shaft between the ratchets for free oscillation about the screw shaft is a lever 112 carrying'two pawls 113 and 114 cooperating, respectively, with the ratchets 110 and 111. The pawls 113 and 114 are each provided with a leaf spring 115 working against a projection on the back of the pawl for holding the pawl either in or out of engagement with its ratchet, depending upon the adjust-ment of the pawl.

The lever 112-is operated-by the magnet 40 which controls the ratchet feed 36 to effect the adjustment of the chuck with relation to the feed table at the same time the feed table is adjusted.- To this end the link 39 which connects the core ofthe solenoid with the bell crank 38 is extended beyond its pivot and connected to the end of the lever 112 through a connection permitting relative movement of the lever 112 and the link 39 in both directions of adjustment of the feed table. As shown in the drawings, these connections comprise a wideyoke 115 formed on the end of the lever 112 and carrying a guide'bar- 116 workin through ar'slot 117, in the upper end of the ink. The width of the yoke 115 is such as to permit aeaeea the full lateral movement of the feed table,

that is, it is equal in length to the longest line of engraving which the machine is designed to produce, while the slot 117 is of a length equal to the greatest Width of design which the machine is desi ed to produce, so that the feed device will not limit the operation of the machine. The upper portlon of the link 39 preferably works through guide pins projecting from the, carriage to prevent binding of the slot 117 on the guide rod as the feed table is shifted. In operating this device one pawl or the other will be ad usted to. operatively en age its ratchet to thereby give the feed tab e a slight extra motion independent of the movement of the stylus and type carriage upon each operation of the cutting tool, the effect being to either begin the engraving of each successive line slightly in advance of its normal position, thus glving it a forward slant, or carry the lower end of the line slightly beyond normal position to give a rearward slant, depending upon which of the pawls is operative. When a vertical design is to be reproduced from the vertical type, both pawls are adjusted to be inoperative.

In Fig. 15 I have illustrated an attachment of the machine to be used for engraving upon a curved surface, such, for instance, as the inner surface of a ring. This attachment consists of a bracket 120 having a detachable connection 121 with the feed table 13, the bracket carrying abearing 122 for a rotary chuck 123 in which the ring or other article to be engraved may be clamped. The rotary chuck is provided with a drivin gear 124 which is operated by a rack 125 detachably connected to the feed table 3 for reciprocation with it. The tool employed for this engraving has its point offset from its shank as illustrated, and in order that the centering of the machine and the operation of its automatic stop mechanism will not be disturbed, the case 93 will be adjusted away from its normal position shown in Fig. 3 an amplitude equal to the extent of offset of the point of the cutting tool from its shank.

The construction used in Fig. 12 may. ob-

viously be used also for exterior work I) artic e instead of the exterior.

In Fig. 14 I have illustrated an attachment to' be employed in some classes of work, for instance, in engraving script letters or similar designs where the lines cut in the metal should appear unbroken. The attachment'comprises essentially a mall auxiliary motor supported on a fix d bracket arm 131 on the tool supporting carriage. The shaft of the motor is mou ed for vertical adjustinent in its bearings and carries at its lower end a chuck 132 in which the cutting tool is clamped.

The upper end of the motor shaft is-proas it is reciprocated with relation to the work causes the tool to cut away the metal between the successively engraved lines, thereby producing work of the same appearance as if hand engraved.

The rotary tool attachment may be used for either intaglio or relief engraving, as will be obvious.

I claim:

1. In an engraving machine, the combina-. tion of a cutting tool, a work support, a pattern holder, a stylus co-operating with the pattern holder, a driving motor and connections between said motor and said first mentioned parts for simultaneously imparting correlated relative movement to said cutting tool and work holder, and said pattern holder and stylus, respectively, said connections comprising means for varying the amplitude of movement imparted to the operated parts by the driving motor and independent means for varying the speed of movement imparted by said motor.

2. In an engraving machine, the combination of a relatively movable cutting tool and work table, a relatively movable stylus and pattern holder, electrical connections til controlled by the movement of the stylus movement for shifting the tool into and out of cuttingposition, means for varying the relative amplitude of the relative movement of the work table and tool, and stylus and pattern, respectively, and means for causing the cutting tool and work table and the stylus and pattern holder to be simultaneously centered in all positions of their adjustment.

3. In an engraving machine, the combination of a reciprocating work table, a relatively fixed cutting tool, a stylus, means for y reciprocating the stylusin timed relation to usln a chuck to engage the interior of the the pattern and stylus to thereby reverse the engraved design with reference to the pattern.

4. In an engraving machine, the combination of a cutting too a work support, a pat- Ill tern holder, a stylus co-operating with the "work support and said stylus and pattern holder to start the engraving at one side of the center of the design to be engraved and means controlled by said adjusting means for automatically stopping the driving motor when a design symmetrical with the center of the pattern has been engraved by the tool.

5. In an engraving machine, the combination of a relatively movable cutting tool and work table, a relatively movable stylus and pattern holder, electrical connections controlled by the movement of the stylus produced by the pattern in theirrelative movement for shifting the tool into and out of cutting position, means for varying the relative amplitude of the relative movement of the work table and tool and stylus and pattern, respectively, and means for imparting a periodic additional movement to the work table to vary the form of design.

6. In an engraving machine, the combination of a relatively movable cutting tool and work table, a relatively movable stylus and pattern holder, positive means for accurately centering the tool and work table, and co-operating mechanism actuated by said meansfor centering the said stylus and the pattern.

7. In an engraving machine, the combination of a cutting tool, a work support, a pattern holder, a stylus co-operating with the pattern holder, a driving motor, connections between said motor and said first mentioned parts for'simultaneously imparting correlated relative movement to said cutting tool and work holder and said pattern holderand stylus, respectively, electrical connections between said stylus and said cutting tool for moving the latter into and out of engagement with the work during the relative movement of thestylus and pattern in'one direction, and electrically operated means controlled by the driving motor for maintaining the stylus out of engagement with the pattern throughout the movement of the stylus in the other direction.

8. In an engraving machine, the combination of a cutting tool, a work support, a pattern holder, a stylus co-operating with the pattern holder, a driving motor, connections between said motor. and said first mentioned parts for simultaneously imparting correlated relative movement to said cutting tool and work holder and said pattern holder and stylus, respectively, and electrical connections between said stylus and said cutting tool for moving the latter into and out of engagement with the work during the relative movement of the stylus and pattern in one direction, said connections comprising a contact piece carried by said stylus,

and a fixed contact piece external to said stylus and pattern and adapted to be engaged by the movable contact upon oscillation of the stylus as effected by said pattern.

9. In an engraving machine, the combination of a cutting tool, a work support, a pattern holder, a stylus co-operating with the pattern holder, a driving motor, connections between said motor and said first mentioned parts for simultaneouslyimparting correlated relative movement to saidy cutting tool and work holder and said pattern holder and stylus, respectively, electrical ponnections between said stylus and said cutting tool for moving thelatter into and out of engagement with the work during the relative movement of the stylus and pattern in one direction, and electrically operated means controlled by the driving motor for maintaining the tool and stylus'out of engagement with the work and pattern respectively, throughout the movement of the stylus in the reverse direction. 10. In an engraving machine, the com bination of a cutting tool, a work support, a pattern holder, a stylus cooperating with the pattern holder, a driving motor, connections between said motor and said first mentioned parts for simultaneously imparting correlated relative movement to said cutting tool and work holder and said pattern holder and stylus, respectively, electrical connections between said st his and said cutting tool for moving the atter into and out of engagement with the work during the relative movement of the stylus and pattern in one direction, said connections comprising two fixed independent contacts external to said stylus'and pattern, movable'contacts carried by said stylus and cooperating respectively with said fixed contact, one of said movable contacts engaging its fixed contact on the upward movement of the stylus, the other movable contact engaging its fixed contact on the downward movement thereof and means for connecting either of said fixed contacts with a source of electrical current-to thereby cause said machine to engrave in relief or intaglio as desired.

11. In an engraving machine, a relatively movable cutting tool and work table, a relatively movable tracer and pattern holder, circuit controlling means operable; upon contact of the tracer. and pattern and removed from their point of contact for, electric'ally effecting operation of the cuttingr moved from their point of contact for elecreeaeea circuit controlling means operable upon contact of the tracer and pattern and retrically efi'ectin operation of the cutting tool, a rock sha t and supporting means for said tracer fixed to said shaft.

13. In an engraving machine, a relatively movable cutting tool and work table, a relatively movable tracer and pattern holder, circuit controlling means operable upon contact of the tracer and pattern and removed from their point of contact for electrically efiecting. operation of the cutting tool, a

rock shaft, supporting means for said tracer fixed -to said shaft, andsaid circuit controlling means carried by the shaft.

14. In an engraving machine, a relatively movable cutting tool and work table, a relatively movable tracer and pattern holder,

circuit controlling means operable upon contact of the tracer and pattern and removed from their point of contact for electrically efl'ecting operation of the cutting tool, a rock shaft, supporting means comprising an integral angular extension of the tracer.

15. In an engraving machine, a relatively movable cutting tool andwork table, a relatively movable tracer and pattern holder, circuit controlling means operable upon contact of the tracer and pattern and removed from their point of contact for electrically efiecting operation of the cutting tool, and means providing rocking mounting for the tracer.

16. In an engraving machine, a relatively movable cutting tool and work table, a relatively movable tracer and pattern holder, circuit controlling means operable upon contact of the tracer and pattern and removed from their point of contact for electrically efiecting operation of the cutting tool, the said tracer mounted to rock in a plane parallel to the plane of the relative movement of the tracer and pattern.

17 In an engraving machine, a relatively movable cutting'tool and work table, a relatively movable tracer and pattern holder, and a work holder movable relative to the table, while said table is in movement to vary the form of design.

18. In an engraving machine, a relatively movable cutting tool and work table, a relatively movable tracer and pattern holder, a work holder movable relatively to the table while said table is in movement to vary the form of design, and means for optionally varying the extent of the relative movement.

of the table and work holder.

19. In an engraving machine, a relatively movable cutting tool and work table, a relatively movable tracer and pattern holder, a work holder movable relatively to the table while said table is in movement to vary the to of design, and means for optionally varying the direction of movement of the work holder relatively to the table.

20. In an engraving machine, a relatively movable tool and work table, a work holder on the table, and means operable upon movement of the work table for shifting the position of the work holder upon the table. Y

21. In an engraving machine, a relatively movable tool and work table, a work holder on the table, means operable upon movement of the work table for shiftin the position of the work holder upon t e table, and means for optionally varying the direction of shifting of the holder upon the table.

22. In an engraving machine, a relatively movable tool and work table, a work holder Ill on the table, means operable upon movement eration thereof, a. pattern, movable means actuated by engagement withthe pattern, and means whereby the movement of said means electrically controls the reproducing device. 1

25. In a reproducing machine, a reproducing tool, a relatively movable tracer and pattern, means whereby movement of the tracer caused by its engagement with the pattern elegtrically controls the operation of the too 26. In a reproducing machine, a relatively movable work table and tool, a relatively movable tracer and pattern, means whereby movement of the tracer caused by its enga e ment with the pattern electrically ed'ects t e operation of the tool.

27. In a'reproducing machine, a relatively movable work table and tool, a relatively movable tracer and pattern, means whereby movement of the tracer caused by its en 'gagement with the pattern electrically eftill lltlll llll tool holder thereon, of a work table, means for reciprocating the table under the tool holder, means for feeding the table transversely to its path of reciprocating travel, and means for moving said tool holder away from its support whereby to properly center oil-set cutting tools relative to work on the table, said means comprising a bracket vertically adjustable relative to the support, and a tool casing secured to the bracket and horizontally adjustable relative thereto.

31. A circuit controlling mechanism for electrically controlled reproducing devices including in combination with a pair of relatively movable contacts a movable element, a pattern engageable with said. element to eifect movement thereof, and means whereby movement of said element effects the relative movement of said contacts;

32. In an engraving machine, a cutting tool, a relatively movable tracer and pattern, means spaced from the point of contact of the tracer and pattern whereby movement of the tracer caused by its engagement with the pattern electrically etlects the operation of the cutting tool.

33. In an engraving machine, a relatively movable pattern and tracer, said tracer mounted to rock in a plane parallel with the plane of relative movement of the tracer and the pattern, a cutting tool and means whereby rocking of the tracer caused by its engagement with the pattern electrically effects operation of the tool.

34. In an engraving machine, a relatively movable cutting tool and work table, a relatively movable tracer and pattern holder, driving means for positively effecting relative movement of said elements, and. a

naeacsa change speed mechanism associated with the driving means.

35. In an engraving machine, a relatively movable cutting tool and work table, a-

and pattern holder, driving means for positively efli'ect-- relatively movable tracer ing relative movement of said elements, and a change speed mechanism associated with the driving means, and means independent of the change speed mechanism for varying the relative amplitude of movement of said relatively movable elements.

36. In an engraving machine, a relatively movable cutting tool and work table, arelatively movable tracer and pattern holder, a stop mechanism, means for adjusting said mechanism to automatically and simulta-j neously stop said relatively movable parts 38. In an engraving machine, the combi- I nation with a cutting tool of a work table, a work holderon the table, means for reciprocating the work table under the tool, means for feeding said work table transversely to its path of reciprocating travel upon each reciprocation thereof, means associated with aid last mentioned means for effecting relative movement of the work holder and table, said means being adjustable to control the direction and extent of movement between the table and work holder.

39. In a reproducing machine, a relatively movable tracer and pattern, said tracer being mounted to rock in a plane parallel to the plane of relative movement of the tracer and pattern.

Signed at New York, in the county of New York and State of New York, this 7th day of August 1920.

CHARLES C. BRUCKNER.

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