US2669781A

US2669781A - Engraving machine

Info

Publication number: US2669781A
Application number: US202154A
Authority: US
Inventors: Steinbrecker Freddy; Peter M Henkes
Original assignee: George Gorton Machine Co
Current assignee: George Gorton Machine Co
Priority date: 1950-12-22
Filing date: 1950-12-22
Publication date: 1954-02-23
Anticipated expiration: 1971-02-23

Description

Fe 23, 1954 F. STEINBRECKER ET AL 6 8 ENGRAVING MACHINE 5 sheets-sheet 1 Filed Dec. 22. 1950 Feb. 23, 1954 F. STEINBRECKER ET AL 2,669,731

ENGRAVING MACHINE 5 SheetsSheet 2 Filed Dec. 22. 1950 IN VENTOR BY 7 F Pz/ W ATTORNEYS,

Feb. 23, 1954 F. STEINBRECKER ET AL ,669,731

ENGRAVING MACHINE Filed Dec. 22, 1950 5 Sheets-Sheet 5 "1% F H ho QELAEEL ATTORNEYJ.

. INVENTORJ. 9%

Feb. 23, 1954 F. STEINBRECKER ET AL ENGRAVING MACHINE 5 Sheets-Sheet 4 Filed Dec. 22. 1950 1N VENT 0R5:

,9 PM 12.0w

ATTORNEYS.

Feb. 23, 1954 F. STEINBRECKER ETAL 2,669,

ENGRAVING MACHINE Filed Dec. 22, 1950 5 Sheets-Sheet 5 5 j'mzm FAFL/ 5 66 IN VENTOR:

BY J51 ATTOR NE Yd i nal axis of the work piece. centered is capable of cross movements under the control of the pantograph linkage and is lsynchronized with the movements of the work Patented Feb. 23, 1954 ENGRAVING MACHINE Freddy Steinbrecker and Peter M. Henkes,

Racine, Wis., assignors to George Gorton Machine Co., Racine, Wis., a corporation of Wisconsin Application December 22, 1950, Serial No. 202,154

18 Claims.

Our invention relates to engraving machines, and more specifically to those types of machines for cutting or engraving designs, indicia and the like, on the circumferential, curved, exterior surfaces of cylinders, rolls or similar work pieces; and the objects and nature of the invention will be readily recognized and understood by those skilled in the art, in the light of the following explanation and detailed description of the accompanying drawings illustrating one possible embodiment or mechanical expression of our invention from among other forms, embodiments, expressions, designs, constructions and combinations, of which the invention is capable within the broad spirit and scope thereof.

One of the primary objects of our invention is to provide improvements in engraving ma chines for cutting or engraving designs, indicia and the like on, and either completely or partially around, the circumferential surfaces of cylinders and rolls of substantial weights, lengths and diameters, in accurate scaled reproduction of a master design or pattern.

A type of engraving machine utilizing a tracer controlled pantographic linkage for cutting or engraving designs on the circumferential surface of a cylinder or roll in sealed reproduction of a master design or pattern, is disclosed in the U. S. Patent 2,110,873 to George Gorton et al., dated March 15, 1938. The engraving machine disclosed in the aforesaid patent is on the market and in successful use but is capable of only bandling and engraving upon cylinders of rolls within a limited range of weights, lengths and diameters, and is not adapted to engraving on rolls of substantially greater weights, lengths, and

diameters. The machine organization of the above identified U. S. patent provides a rotary work holder, a stylus, a pantograph linkage, a

tool spindle, and mechanisms associating such components, in a manner such that when operated in combination, the cross movements of the tracer or stylus relative to the machine in following a master design or pattern, efiect movements of the pantograph linkage which in turn causes cross movement of both the roll or cylindrical work piece and the tool and synchronized rotation of the work piece. The tool is maintained at all times centered relative to the work piece, that is, with its axis perpendicular to and lying in the same plane as the longitudi- The tool which is piece. While the machine of the aforesaid patent is capable and eificient in operation within the work piece capacity of the machine, the sensitivity and precision in operation thereof are dependent upon the size and weight of the cylindrical work piece, that is, sensitivity and efficiency of operation are eifective only in engraving upon work pieces within a limited range of work piece weights and dimensions. As the machine organization of said patent requires transportation and movements bodily of the work piece across the machine in performing the engraving operations, in addition to rotation of the work piece, guideways and the necessary associated structures are required for carrying out such transportion and movements bodily of the work piece. Hence, in order to adapt a machine of the patent organization to accommodate and handle and to engrave upon the surfaces of, rolls or cylinders of substantially greater weights, lengths and diameters, than those for which the organization is adapted, it would be necessary to provide a machine of massive and impractical proportions and dimensions with all of the supporting members proportionately increased in size, weight and strength, in order to support a roll or cylinder of such substantial weight and size for movements bodily, while retaining for the machine the essential sensitivity and precision in operation.

A machine of ourl present invention may be considered to constitute in certain respects, an improvement on the machine organization of the above identified U. S. patent, and it is, therefore, another object to eliminate certain of the dis advantages and work limitations of the machine of said patent, and to provide a machine capable of eificiently engraving upon the circumferential surfaces of cylindrical work pieces of substantially greater weights, diameters and. lengths than can be practically and efficiently handled and engraved by the machine organization of the patent.

A further object is to provide a design of roll engraving machine of the tracer controlled, pantograph type in which the work piece or roll during engraving operations is maintained in a fixed position for rotation about a fixed axis to thereby eliminate the necessity for movements bodily of the work piece in either directions axially or laterally relative thereto.

Another object is to provide such a tracer controlled, pantograph engraving machine for engraving upon the circumferential surfaces of icylindrical, roll-like work pieces in which the rectilinear movements of the tracer in and out relative to the machine and transversely of the work piece in following a master pattern are converted into rotary movements of the work piece in synchronization with and in scaled relation to the movements of the tracer.

Another object is to. ,provide such. a ."machine in which. the-"movements of the tracer or +stylus in following the pattern in directions cross-wise of the machine and axially or longitudinally relative to the cylindrical work piece .being engravea, are translated as cross-wise movements of the cutter along and constrained to astraight line path parallel with theilongitudi-nalxaxis of the work piece and with the: cutter maintained at all times with its axis perpendicular to and in a plane passing through, such work-piece longitudinal axis.

Another object is to provide such a machine in which the cutter is constrained against move- -:ments: rinaazndout ;relati-ve to thezmachineaand :transversely relative to the work piece, ;-but 'is amounted for mcvementsalong, andconstrained to gazstraight line path parallel with thevlong-itudinal aaxis; of'the, workpieceywith. the axis-:of ,thezcutter ,--rnaintained perpendicularito, the axis-of the work piece.

nrfurtherr-objcctiis {to provide mechanism'rin snchaga machine actuatedby movements: of the tracerccontrolled.1pantograph for rotating the rworkrpiece; inwhichrsli-ppage. or lost. motionand -.zbackji lashsare; substantially.eliminatedto insure ,aaccnracy .of reproduction.

2A fnrther object iS-tOPI'OVidErfi novel tracer :controlled;pantographmechanism. for converting r'rectilinear movements of the tracer or stylus in 501218 .riimens-ion into rotary, :movements z-i-n such :dimension :of :a -'-.w.crk" :piece "or YOU-1.6T 1 element. in ;-precisely :rscaleid :-reiation to the tracer ,move- :.:ments.

Another obj ect is to eliminate the useof toothed -rdrivingsvand driven elements such as gears; pinions,:-racks: and z the like, in a i tracer controlled -cnemtograph mechanism for transmitting and .wccnvertingrectilinear:movementsof the: tracer or .zstydiusz intoirotary; movementsnof avwork .piece 'or :ntherrdrivenzmember.

, Another: object is .1301 provide-:fonselective, sprexcise adjustment ;of ,such::a: tracer. controlled, pantograph mechanism to set thezvmechanism'ito-efiiectszby a givenl linear movement of the ,tracer, a .;-:degree :ofrotation of i the work piecei: inpsaccord- .zance withithez-diameterzof the work:,piece,;so:as rtormaintain .accuratelya predetermined ratio. be-

tween: the linear movements of r: the tracer rand the-:rotary-movement of the-work -piete fora-work :rpieoes of: different/diameters.

And a further object: is. toprovide a :design of roll :engraving -machine carrying out the i foreugoing' obiects an'd features; which will :beof pracrticalvdimensions and: weightsrlto accupy: a rninivmum of "floonspacaawhile being capable of handling and engraving with a high degreeof preacisiomon :and around the circumferential surrfaces -of cylindrical .or roll like workpieceswof rsubstantial'ly great ilengths, diameters and weights.

.With the foregoing and various other objects,

-"features: and results in; view, which others willbe -'redctilyvapparentto those skilled in this. art, our

invention.- consists =i-n certain q novel features in design @and construction and 'in arrangements, .nombinations rand sub-combinations "of :parts, .wcomponentsandamechanisms,all as :wilLbe more runvzreferred rte iand specified neremafter;

PLO

Referring to the accompanying drawings in which similar reference characters refer to corresponding parts and elements throughout the several figures thereof.

Fig. 1 is a view in top plan of a roll engraving machine of our invention, showing a roll-like .work'pieee in mounted position omthe work table tor repro'duction thereon of a pattern*' mounted on a copy table.

Fig. 2 is a view in side elevation of the ma.-

.,.,chine,.of, .Fig. 1.

Fig. 3 is a view, partly in top plan and partly in horizontalrsectiom through the ratio compensat- "*ingsvandl movement converting and transmitting me'chanisms therefrom to the rotary work holder of the machine.

rfiiglwisarviewcin side elevation of the movement converting and ratio compensating mecha- :nisms from the pantograph to the rotary work holder.

rEi-g: 5. iseaviewin front-elevationzof the mechavnisms' of 4.

:Fig.r,:6- isv a.-':detailwvi-ew':irr-side eievatiomrofz'the scale-rmounting :bar rmember :of the '7 ratio zoom- 1 pensatingu mechanism.

' J'Lis a more 101 lessrschemaitic' viemimelevation of the aband carriage, "hands rand .ydmm rotated thereby for: converting: rectilineari into rotary movements.

. Fig.1 8 .is. .a :moretor, lessschematitr viewzinyside elevation of theiarrangement otdrnmmaridzbands :of. the movement transmitting: mechanism, for: ro-

tating the rotarywork"; holder.

The particular *rdlleengraving. :machine raembodying our invention,:.-as :i l'lustrated sand :described: herein v:by-fway of" example, .is adapted to mount andzto engrave :uponzthe circumferential :surfaces of, cylindrical,:round zorlroll like :work pieces ofdiameters:- from six. (6)1;inches,t:rnoresor less,-. to 'twelve (12) inches, more.,or:less, an'dmf lengths 11331- forty? (40) inches morerorzlessmtith corresponding substantial weights depending upon the material :of. :which a the "work piece: :15 formed. 'The vexamplemachine;and .therrange of workcpiece :dimensionsmrd weights asrepecifled :a-bove, areJnOt: presented'byway'ofiiimitationtbut merely r to show the capacity of 1 this #particular machine to handlesandaaccuratelyrzand with -zprecision engrave upon the:circumfer.ential surfaces of cylindrical or roll-likeworkpieces Qtgreat fdimensions and weights. It-.will :be recognized from the following explanation and description of this examplemachine, that otherimachines embodying the basic principlesxand featuresfof our invention may be designed and constructed 3 to handle and engrave upon work pieces tot-greater or lesserdimensions and weights thanrthoseezfor which this particular example machine'xhasrbeen :designed'. 'Itx'will .also be recognized cthatxathe specific design of "the example :machine 1=is :not restrictive. of our invention-as to ;the:generalr-ar- .rangement-of the :machine or iasto; specific .de-

:signs, .forms and constructions of :the various components .andmechanisms making up thema- :.chine. :The basic features ofgour inventionrby which :a cylindrical or roll-likework piece mounted and maintained for rotationzin aiflxed position against movements bodily' during.-the;engraving operations, and 'by which mechanisms are provided :for transmitting movements oL-a. 'tracenor stylus overarpatternin. scaled relation to; a cutter in one dimension and for: converting "rectilinear-movements of the tracer 'or .stylus=in the: other dimension as'solely rotation ,of .the work 11piece;relativeto'xthercutterrmamheeemhodiedmnd combined in other designs and arrangements of machines than the design and arrangement generally typified by the example machine.

The example machine, referring now to Figs. 1 and 2 of the drawings in particular, comprises a horizontally disposed bed structure B with the generally vertically disposed column structure C in position thereon extended vertically upwardly from the rear end portion thereof. The upper side of bed structure B is generally horizontally disposed and mounts thereon the horizontal guideways In which extend longitudinally of the bed structure between column 0 and the forward end of the bed structure. A suitable saddle structure S is slidably mounted on guideways II] for movements in either direction along a straight-line path in and out relative to column C and to the machine. A work table W is slidably mounted on and in position disposed trans versely across saddle S in suitable guideways to permit of movements of the Work table W on and relative to saddle S in either direction along a straight line path cross-wise relative to the machine and perpendicular to the path of in and out movements of saddle S.

A pattern or copy table D is mounted on a suitable supporting structure D, in position on and across the front or forward end of base structure B above and along the forward side of work table W. The copy table D is mounted and arranged to be easily moved from its normal,

operative position out and away from saddle S and work table W to permit of the free loading and unloading of the substantially heavy and large dimensioned work pieces which this machine is designed to mount and handle. This copy table D is provided on the upper side thereof with a horizontal, flat pattern or copy holder F on which copy in the form of a fiat pattern or master P containing on the fiat upper surface thereof the design to be reproduced, may be clamped in proper position on the upper surface of the copy table.

A rotary work holder or chuck unit H is mounted in normally fixed position at one end, in this instance the left hand end, of the work table W in position extended vertically upwardly therefrom for receiving and clamping therein one end of a cylindrical or roll-like work piece R. The work holder H is positioned for rotation about a horizontal axis and is adapted to mount one end of a work piece R therein with the work piece held in position horizontally disposed and extended inwardly therefrom longitudinally of work table W and cross-wise of the machine, for rotation about the horizontal axis of rotation of the work holder. The inner, free end of the roll or work piece R when mounted in work holder H may be supported on a suitable tail stock unit H. secured on work table W, as will be clear by reference to Fig. 1. Thus, a work piece R mounted in position in the work holder H on work table W is rotatable about a horizontal axis disposed cross-wise of the machine and parallel with the straight line path of cross-wise movements of table W on saddle S. The work piece R may be set in required position for an engraving operation by suitable adjustments of the saddle S to move the work piece in or out, and of the work table on and relative to the saddle, to move the work piece cross-wise, of the machine.

A cutter head I2 is supported in vertically dis posed position above work table W and a work piece R mounted in work holder H on that table,

by a system of jointed links I4 and I5. Link I4 is pivotally mounted at its rear end to a supporting bracket structure 24 attached to and extended forwardly from the forward side of column C, adjacent the upper end thereof. Link I4 extends forwardly from column C and supporting structure 24 and the link I5 is pivotally coupled at its inner or rear end to the forward end of link I4. The cutter head I2 is pivotally mounted on and coupled to the forward end of link I5. The cutter head I2 mounts and journals therein a vertically disposed cutter spindle IS in the usual manner familiar in this art, with the lower end of spindle I6 providing the usual chuck or collet for removably mounting therein an engraving tool or cutter E. Thus, if unrestrained, as may be said to be conventional with this type of cutter head mounting, the cutter head I2 and spindle IE would be capable of universal lateral movements over work table W and a work piece R mounted in the rotary work holder H.

However, in accordance with our present invention we constrain movements of the cutter head [2 to a straight line path cross-wise of the machine and parallel with the axis of rotation of the rotary work holder H and of the work piece R mounted therein, in a direction corresponding to one dimension of the pattern to be traced and reproduced. We have carried out this constraining of the cutterhead I2 against in and out movements relative to the machine in the instant example, by providing a pair of spaced, horizontally disposed slide rods I 1 across the machine in position below but spaced at the rear of cutter head I2 and parallel with the axis of rotation of the work piece B when mounted in workholder H. These slide rods ii are secured and fixed at their opposite ends in supporting arms I8 which are secured to opposite sides of the supporting structure 24 on which link I4 is pivotally mounted. These support arms I8 extend laterally outwardly from opposite sides of such structure and are curved or extended forwardly in generally parallel relation to receive therebetween the slide rods IT with the opposite ends of these rods secured in the forward ends, respectively, of such support arms. A slide member 20 is slidably mounted on rods I1, and this slide member provides a forwardly, horizontally extended fixed link or arm 2! which may be formed with a vertically disposed circular bore forming an eye therethrough which receives therein the lower portion of cutter head I2, as will be clear by reference to Figs. 1 and 2. The mounting and position of the slide rods H which define the straight line path of cross-wise movements for and to which cutter head ii. is constrained, and of the cutter head and its spindle It relative to the work holder H and the work-piece R mounted therein, is such that the axis of the cutter spindle It is perpendicular to the common axis of rotation of work holder H and of workpiece R therein with these axes lying in a common vertical plane. In this manner the cutter spindle I6 is centered relative to a work piece and such centered position is at all time maintained by the slide member 2a confined on rods I7 against in and out movements, that is, movements transversely of a work piece R.

Any suitable or usual powered drive transmission, indicated generally by the reference characters 22, may be provided for rotating the cutter spindle It in the cutter head [I2 in all positions of the cutter head.

A pantograph mechanism, indicated as a unit by: the referencecharacter G,r=isnmountedratlthe right hand sideof cutter ahead: I 2 inhorizontally disposed position over-and above-workrtable =W andi the slide rods I! and their :support arms i I8. This panto'graph: mechanism G i is lot the parallelogram, jointed link-type. Thejointe'd links of the pantograp-h Gare comprisedvby theipivotally connected-armatl 32; t3 and 34.

5pm 3| is in this: instance located atthe' outer side or the pantograph G I with arm 32 pivotally connected at its outer end to=the reamend-of arm- 3 I -:by the pivot 35, and with the outer-end charm-.34 pivotally connectedtotthe forward end of" arm 3Iuby pivot The arm BI is extended torwardly:from pivot 35 to provide the tracer arm 30- extended over-and across-copy table D. Tracer arm 39 is provided :at its forward, front and: free-end with a trace'r and/or stylus. holder 30min which there is mounted in vertically disposed position-a tracer T having the usual master or pattern scanning stylus at its lower end,'asiwill beifami-liarto thos'eskilled in this art. The arm 32is-pivotallyconnected at its rear,=inner=end to the rear endof arm t3 -byapivot *31. The forward end of-armtt is-extended to cutterhead and is provided-with asuitahle collar 39 which rotatably receives the cutter head I I2 to thereby form a pi'i-maryipivotalsupport point ier the pantograph'G. The inner end of arm-Madjacent arm :33 ispivotally connected to 'arm 3 3 ataipoint spaced rearwardly there-along from the .cutter head liby pivot '39to thereby complete the parallelogram linkage'of the pantograph unitG. The pantograph linkage G is thus mounted for lateral swinging about the axis of cutterhead i2 and cutter'spindle 16, inva planegenerally perpendicular to that axis.

The inner end ofthe-arm'32 is extended rearwardly and outwardly I from the pivot-31, as an axial continuation of arm '32, toprovide the arm 40 which constitutes the member orelement by which in and out movements of the pantograph under the controlof the tracer T- in the in-and out dimension, that is, transversely of a workpiece, are'transmitted to the vmechanism :for converting-the movements of the endof arm 40-into'rotary: movements of the work holderI-I and a-=work piece R mounted therein.

A slidemember '4I is slidably mounted'ona pair of parallel, spaced and horizontally disposed slide rods 52 which-are m'o-untedand located on-the cutter-head supp-ortstructure 24 carried b'y column C, in a location adjacent the left hand side of such structure. These slide i'nds are disposed in. positions to extend in directions from front to rear (in and-outiof the machine and transversely or perpendicular to-the ates-of the slide rods I'i'for the cutter head-slide member 21) and to the axis-of rotation of the wvrk holder-H. The free 'end'of the extended arm'40 of'pantograph arm 32 is pivotally connected and coupled toslide member 4I-by a pivot 43-whlch providesa pivotal axis-perpendicular to the axes of the slide rods 42. The slide mem- -ber-4l-on sliderods- 42 thus-provides-a floating pivot 'and'pivotal support for the pantogr-aph --unit G between the end of'extendedarm 40 thereof and-the slide member. Movements of the pivot 43 in sealed relation to in and out movements of the tracer T in following a pattern or master P on'copy table D are thustransmitted .to slidemember 4! and translated therebyinto straight line movements along the path defined by slide rods 42, in directions in and out relative to the machine and correspondingand: in.- sealed relation "to the in and out I movements of 11 the tracer'T.

Movements :of the. tracer -TI cross wiseof apattern P andof the machine; that is,xalong-stnai'ght line paths parallel with the --axes .of work piece rotation, will: be transmitted-through the. pantograph' G tothe cutter head I2, and willefieet only movements of the cutter head along its straight line path defined bythesliderods I1. Under such conditions of operation, ne -movements will-She transmitted by the pantograph G througharm thereof to 'thewslide member "4| as arm-- will merely floatabout 1 pivot- 43. 'However, in: and out-movements of tracer -T-LoVerthepattern-P :along..-straight line paths perpendicular .tothe axis of work piece rotation, will-be transmitted by the extended-arm 40,-through .thefioating pivot 43 to :the slide member =4I -.-to cause that member to move in corresponding directions along x the straight line path-:defined-by thevs lide rods 42. This is sobecause thecutter-head -12 on-which the pantograph unit G has pivotalsupport by slide member 20, is positively constrained by -rods IT against any in and out movements and such movements are-thereby translatedinto movements of the slide member 4 I by rotation or lateral-swinging-of the pantographi-unituG in a horizontalplane about-cutter head -I2 as a fixed'axis. --With the .-arrangement and relative mounting of theipantograph unit- Gpivotally supported on cutterhead I2 for-pivoting about the axis of that head and-the cutterspi-ndle I6,:-and pivotally coupled through "extended arm 40 to slide 4I through pivot 43,-it-is to be noted that the axes of tracer T, cutter spindle-[Stand floating pivot .43, are -.alWays-maintained-.in a Straight line, that -is,-alw'ays lie in-a'common vertical plane in all positions of operation of the pantograph unit.

We provide for rotat ngthe .work holder.H to correspondingly revolve a work ipiece .R clamped in working position therein, from the rectilinear movements of the slide member. .We carryout the rotationof the work holder H through the medium of an organization or mechanism which converts the-rectilnearmovements of-the slide member 4 I into rotational movements ofthe work-holder H,with such rotationaLmovementsof the Work holder being synchronized with-and in a definite .p-redetermined ratio to them and out/movements of thetracer T over a pattern- P-in accordance with the diameterof aparticular work piece being-engraved. -We also include-in this movement'converting organization, adjustable, 'ratio compensating means by which the degreesof rotational movements-of a workpiece may beadjusted inaccordance with the diameter of -that workpiece, to thereby maintain a predeterminedratio of scaled reproduction between the in and out movements-oi. the tracer T and the degrees of the resulting rotational movement of the work piece! to move its circumferentialsurface relativetothe cutter E.

In the particular mechanicahexpression of 'such movement converting organization'of-the example machine, we provide a'slide carriage which is -mounted for reciprocation along a straight line path on and defined bya pair -of parallel, vertically spaced, horizontally disposed slide rods 5| whichare mountediin fixed posit-ion at the left-handsideof thermachinebelovv'the slide:- member .4 I to which the; pantographdi: is coupled by'th'e floating-pivot-Aii. The-slide rods 5 I r are: positioned with -.their -:axes;parallel i-with the-axes on slide rods fl 'on =whi'ch =slide-.member 9 4| is mounted, that is, parallel with the straight line paths of in and out movements of tracer T and perpendicular to the straight line paths of cross-wise movements of the tracer.

This slide carriage 50 includes a body 52 which is provided at the forward, upper side thereof, with the horizontally disposed, laterally offset and generally parallel posts or arms 53. The posts or arms 53 are provided at their outer free endswith clamp plates 54, respectively, by which the ends of a pair of fiat, flexible steel or the like, bands 55 and 5B are clamped to the ends of the arms 53.

At the outer side of and opposite the slide carriage 50, a shaft 51 is supported and iournaled in a fixed bearing unit 51a. Shaft 51 is disposed in horizontal position with its axis in a plane passing below carriage arms 53 and perpendicular to slide rods 5| and to the straight line path of movements of the slide carriage 50 thereon. This shaft 51 mounts at its inner end for rotation therewith, an actuating drum 58 of a di-- ameter such that a plane passing through the uppermost side of its periphery is in immediate proximity to the plane of the under surfaces of arms '53. The band 55 is attached to the rear end of the rearwardly extended arm 53 of carriage 50 by a clamp plate 54 and is extended forwardly across the upper side of the periphery of drum 58 and is then wound around the drum in a clockwise direction when facing the outer side of the drum, with the end of the band being fixed to the drum. The band 56 is attached to the forward end of the forwardly extended arm 53 of carriage 50 and is extended rearwardly to and across the upper side of the periphery of drum 53 and is then wound around the drum in the opposite direction from the direction of winding of band 55 on the drum, with the end of band 56 fixed to the drum. Band '56 is located on drum 58 to the rear of the band 55, due to the offset of the forward arm 53 inwardly relative to rear arm 53.

Hence, straight line movement of slide carriage 50 rearwardly on slide rods 5| will unwind band 55 from the drum 58 to rotate the drum counterclockwise when facing the drum from the left-hand side of the machine, and at the same time will wind band 55 onto the drum. Movement of the slide carriage 50 in the opposite direction, that is forwardly on slide rods 5|, will,

reverse the action of the bands, in that band 56 will then unwind from drum 58 and effect rotation of the drum in a clockwise direction while the band 55 will be wound onto the drum. In this manner the rectilinear movements of slide carriage 50 forwardly or rearwardly in either direction along slide rods 5| will, through the arrangement of

bands

55 and 56, convert such rectilinear movements into rotational movements of the drum 58 and shaft 51 in a clockwise or a counterclockwise direction, respectively. The length of the

bands

55 and 55 and the mounting and attachment thereof on and to drum 58 and to the carriage arms 53, is such that the bands are taut, but without placing the bands under undue tension, so that no slack exists in the bands. Thus, a transmission which converts the rectilinear movements of carriage 50 into rotary movements of drum 58 is obtained which is free of slippage with backlash eliminated, so that a predetermined, fixed ratio between such movements may be maintained without material variation.

A transmission or drive is provided from shaft 51 to the rotary work holder H for effecting rotation of the latter by rotation of shaft 51, In this instance we have provided a form of transmission of our invention which embodies the use of rotary drums and flat, flexible bands connected therebetween for transmitting the rotary movements of the drum 58 to the work holder H. Such transmission or drive includes a drum 50 mounted on shaft 51 at the outer side of drum 58. The rotary work holder H includes the horizontally disposed shaft or spindle in which mounts on its outer end a drum 62 which is in lateral alignment with drum 65 on the shaft 51. A thin, flat flexible steel or the like material band 53 is connected at one end to the drum 60 and extends over and across the upper side thereof and forwardly to and across the under side of the peripheral surface of the drum 52 on the spindle 6i of the work holder H, with the end of the band on drum 52 being secured to such drum. A second band 54 similar to band 63, is attached at one end to the under side of drum at the outer side of band 53 and this band 54 is extended around the under side of the peripheral sur face of drum 6i) and upwardly to and over the upper side of the peripheral surface of drum 62 with the end of the band being connected to the drum 52. Thus, rotation of drum 50 in a. clockwise direction, when facing the left-hand side of the machine, will wind band 65 onto the drum 55 and unwind this band from drum 62 to effect rotation of the latter drum in the opposite direction or counterclockwise. During such operation band 53 unwinds from drum 5t and winds onto drum 52. In the reverse operation when drum 50 is rotated counterclockwise, band 63 is wound onto drum 65 and unwound from drum 52, while the band 63 winds onto drum 50 and unwinds from drum 62, so that the latter drum is then rotated by the bands in a clockwise direction. The foregoing arrangement of drums and 52 with the

transmission bands

63 and 64 connected therebetween, eliminates slippage and backlash and insures accurate transmission to drum 52 and the rotary work holder H of the precise degree of rotary movement of the driving drum Bil.

In the machine of this example, the drums BI] and 62 are mounted and journaled within a sup porting and housing structure 55 which is mounted at its forward end on the left-hand end of work table W at the outer side of work holder H, and which extends rearwardly to and receives therethrough the shaft 51. The work holder spindle 6| extends into the forward end of structure G5 with the drum 52 on the spindle located in such forward end of the housing structure. The drum 55 is mounted and journaled in the rear end portion of structure 65 with the shaft 51 splined thereto for movement of drum 50 axially in either direction therealong while being maintained in rotary driven relation therewith. The drive or transmission supporting and housing structure 55 and the drums 55 and 62 mounted therein with the

transmission bands

53 and 64 therebetween, are movable as a unit assembly cross-wise of the machine by cross-wise movements of table W upon and across saddle S with the drum 65 being moved axially along shaft 51. The shaft 51 is preferably provided of extended length outwardly to give an extended range of cross-wise movement of work table W to the left to thereby accommodate a wide range of work piece lengths while maintaining operative driving connection between drum 6t and the driving shaft 51.

Byeour :inventionzwez=providea movementzratio compensating, adjustable: bar: unit II. for;- tra... s: mitt-ing the. movements a of the; pantograph. actuated :slide-rmember: 4 l to: .the slide carriage 50, in such a mannerastomove carriage-50 .in- .a selected. predetermined ratio, but: in theqopposite direction, .to the movements-of slide; member: 4 L Thisiratio. compensating .unitIU .in the particular expressionv thereof. adapted to s the example ma-. chine; includesabar or lever. 10 :whichzis-pivoted at its upper end ..to. the under side of the; slide memb'err ll :about a horizontal axisperpendicular tor. the path of straightiline movements of, slide member; that is,:=parallel with the straight line CIOSSrWi-SB movementsmf cutter. head 12. Such pivotalmounting. of the. upper. end .of bar 10 to slide members ,iseffected by a pivot pin? securedzinhorizontal lpositionzacrossyadepending yokeJZ providedat and depending fromthe underside of slide member 4|, with. the upperendof bar 10; beingpivotly mounted on-H betweenthe armspf theyoke.

BarJU includesat its .upperpivoted end, a head 1.0a ofzereater: thickness-than the remainder of the; body length of. the. bar; slidably; mounted on; bar 10 below head Illa: for adjustments verticallyineither direction 1ength+ wise. oraxially oi thebar. The pivot block 13 slidably; receivestherethrough the bar 10, and

the;.portion 140itheblock' at the outer side of bar?! is formed with aninternally threaded bore 141; parallel with thelongitudinalaxis of the bar and openingthroughthe upper, end edge-of block portionfl l. An externally; threaded micrometer screw; 15: has. its: lower end threaded into block bore 14a, and this screw extendsv upwardly along the outerrside-o-f thebar to a fixed bearing member, IS-secured on :thebaradjacent the inner end oiqhead 18.- The -upperend of micrometerscrew I is--journaled. in bearing member lfi and'is held by that member against movements axially relative to the. bar. The end of screw 15 above bearing:. .member 16-is provided with a knurled fin er. gripping head'l'l for-ready manual rotation'of the screw ineither direction to effect adjustments of the pivot block 13 longitudinally of harlot At the: inner side. oi ,theratio ,compensatingrbar IL. the: machine; organization provides; a fixed-,wertically disposed structuretfl in ,the.-form oi alwall; which mountsandsup orts .ontthe outer side thereo opposite. and-j facing pivot block 13 of unit U, a, verticallydisposed single rail '84 .i A pivot carriage ,82 having spaced: wheels l or rollers 83 journaled thereon, is 1 mounted; in: vertically disposedposition with-.therollers -83 rolling en: ga-gement Withthe opposite ,side edges of rail. 8 I so that pivot carriage 82 :is vertically; movable on rail; 81: and;;is constrained by such. rail to a straight line path of movement perpendicular to the'paths. of movement of :slide 4 I and slide-care riaeeiiu. This pivottcarriage. 82 mounts-a fore wardly extended, horizontally disposed pivot member 84 which is:pivotall-y coupled-to and cone nccts .p ivot,block 13 with the pivoticarriage 82. Pivot member. i and pivot carriage 182 thus. form auverticallyadjustable; horizontal.p;ivot for the blade-:13, aboutwhich the bar Hlmay be swung or; rocked :byhorizontal :movements of. the slide member 41 in either direction; on and alongslide IQdS14Z- Body 52 of-theicarriageio is :provided along its rear or inner side-wall with -a.-. vertical rail; ;or single-track 85.. A .carriage- .86 provided with 1 spaced rollers 81 journaled; thereon, is mounted on rail 85 with the spaced rollers 8! tin A pivot block 13 is rolling? neaecmenti with the; oppoeitec. vertical side.-.edges; respectively,'. 0:? the. Verticaliralh-Hi The; carriage 862- is; thus 3 vertically: movable une wardly or downwardly on: rail;85:and:;is-cone strainediby therollerst 1 engagedvwith. theorail, to agstraight line: 'pathof .movement'parallel with thevvertical .pathrofimovement of jpi-vot carriage 827; but perpendicularto the-straight lineopaths of horizontal movements-0t slide qmembenl l-;.-.and carriagefiflr The JIOWBY'. end of :.the-2bar 10;:bel0w pivot member 84 is .pivotly 1 connectedrto :thei-slide carriage 8 6; by; a horizontal pivot member :88? hav ing its axis parallel with the axes of pivotimember: 84-a-nd with the pivot :pin J I which. pivotally connects the upperzend: of barw-lfleto; the slide member. 4!

The throw ofzthelower; end :of barrlt-gofzumt U may beadjusted:byr.thecmicrometeriscrewi7.5 .to raise or; lower z. thepivot :block-al3 'tox-therebyyade lllfifn thie diiierentiai between: the length oirthe lever: arm between pivot :member.:;84 and-the pivot pin ll whichqconnects theiupper endmofrtha-lever to slideamemberz-dl and; the: len th :of :thelever arm Y between; pivotimember: 84 =and ith'e-pivot-M which connects-:thelower 'endof. bar -10 .ztoathc carriage 86 .and' to :the slide :or;bandifcarriagealam I Adjustment of the pivot block 13 upwardly on'the barA 19'511101Bfi585'3th62. throw" ofithelower :end 0! thesbar; and:;hen:ce the distancezofzmovementtoi the: band? carriagev 59. ion; a: given distance of movement of ilil'l'es slide .member :41 whileeadiusta ment downwardly" of pivot-member decreases the throw and thedistance; of movement lot :band carriage 49 for apgiven movementofixslide-imem= ber 41: In :thismannena fixed orrpredetermined ratio between: the movements .oftheatracer Tzover a master or pattern:R-andrtheresulting degrees oft-rotational. movement transmittediito aucylim drical work-piece. mayybemaintained iforrene gravingv-uponr. work piecespi different rdiameters', byproper adjustmentsloitheunit U; ln thesex ample machine, the; arrangement. provides.:;- for reproducing the master design or pattern'pnuthe circumferential; surface ."Of the work-piece .to :onehalf thesize:-oiithe master; design. Hence, to: compensate for? difference in work pieceodir ametersain order to maintain accuratelyyan-d .yvith precision the 21:1 jreduction, it is :necessaryv to ad:- justtheratiobarunit U,-so that atgreater III-0V6: ment; of the engraving-cutter overa .wor-kzpiece of -smallendiameter is acal'riedioutibythe :pantoe graph movement converting andctransmitting mechanisma; than for a3: worka-.piece-:ofa:gr ater diameter;

If desired; a suitablescale having diVlSlOIL'liHES 8,5E5may be; provided along. the outer side. .aof z'bar 10' adjacentztheiorward longitudinal edge:there.- of z for visual. cooperation with azesuitable-ead-iiar cent ..index-;point on. or: adjacent: structural edge of; pivot blocki. 73;: with these scaleilines suitably calibrated and provided "with symbols indicating difierentr wor-k': piece-diameters. Thus; an operatormay -readily quickly effect an adjustment with accuracy and'precision to accord with'the requirements for a workpiece of a'givendi'ameter.,

Preferably the weight of I the pivot b1ock1'13, and .;0f .jcarria 6S.,82 and 86, is counterbalanced, asbv a..weight 8B connectedtoone ,endof, acable M which extends overta. suitable idler pulley-and islconnected. atv its other end to the: pivot iblock, pivot member andupivot carriage assembly .73.- 82T84 as willcbeaclearyby referencetoFig 4. Thus, easev of. manual, .rotation of. micrometer screw 75' to raise and lower pivot block 13 and its associated structures, is insured.

Operational summary In performing engraving operations on the circumferential surfaces of a roll or cylindrical Work piece R with the example machine, the work piece is mounted in. rotatable work holder I on the work table W between the work holder and the tail piece-unit H in position disposed longitudinally of the work table, that is, truly cross-Wise relative to the machine and parallel with the straight line path of movements of cutter spindle It. So mounted, the Work piece R is rotatable about its longitudinal axis, which axis is horizontal and axially aligned with the axis of rotation of the work holder, and is parallel with the path of cross-wise movements of cutter head l2.

A desired pattern P is mounted and secured in proper position on the copy table D by the pattern holder F. This pattern P may be in the form of a flat brass, sheet iron, zinc or sheet plastic member, in which the master design ha been cut or formed, either sunk or in relief. For the example machine which has a 2:1 reduction ratio, the master design formed on pattern P is of twice the size of the design to be reproduced therefrom on the circumferential surface of the work piece R.

The ratio compensating, adjustable bar unit U, is then adjusted to a setting in accordance with the diameter of the work piece R which is to be engraved. This adjustment and setting in the instant example, is effected by adjusting the pivot block it in the required direction along bar l until the index point on block 13 is lined up with that scale division line 89 for the particular diameter of the work piece R. By this adjustment cross-wise movements of the tool E on cutter spindle I6 and the movements of the surface of work piece R past tool E effected by rotation of the work holder H, are caused to be in accurate 2:1 reduction ratio to the corresponding movements of the tracer T over the pattern P. True cross-Wise movements of the tracer T along straight line paths parallel with the axis of rotation of work piece R will be precisely reproduced as cross-wise movements of the tool E along the work piece R axially thereof and through a distance precisely one-half the distance of the corresponding movement of tracer T. During such true cross-Wise movements of tracer T, the floating pivot 43 which couples the pantograph G with the slide member AI, will not have translational movements imparted thereto, and, hence, will not effect any movements of the slide member ll along its mounting slide rods it. Therefore, during such true cross-wise tracer movements, there will be no rotation of work holder H and the Work piece R mounted therein.

True in and out movements of tracer T over the pattern P, that is, movements in either direction along straight line paths perpendicular to the axis of rotation of work holder H and work piece R and to the straight line path of pure true cross- .wise movements, will, through the pantograph G, floating pivot d3, slide member 4|, ratio compensating bar U, band carriage 5i) and the drums 6i] and 62 with their

movement transmitting bands

63 and 64, effect rotation of work piece R through a degree of rotational movement to thereby move the circumferential surface of the work piece past the cutter E a distance precisely one-half of the distance of movement in and out of the tracer T. During such true in and out movements of the tracer T, the cutter has neither in and out movements nor cross-wise movements but is maintained in fixed position by the slide member 28 and slide rods ll. Under such conditions the pantograph G is swingable laterally about the common axis of cutter head l2 and cutter spindle I6, as a fixed axis. In all such in and out movements of the tracer T, as well as in all cross-wise movements and compound movements partaking of both cross-wise and in and out movements, the axes of the tracer T, cutter spindle I6 and pivot 33 are maintained in a straight line lying in a common vertical plane passing therethrough.

In scanning or following the master design on a pattern P, the tracer T may be moved along paths, either rectilinear or curved, between the straight line paths of true in and out and of true cross-wise movements defining the two (2) major dimensions of the pattern and of the design to be reproduced therefrom. Such movements thus are compounded and include both a component of cross-wise movement and a component of in and out movement. Under such compound directional movements of tracer T over the pattern, the cutter spindle It and cutter E will be moved cross-wise and longitudinally along and relative to the work piece, and simultaneously the work holder H will be rotated to revolve the work piece R relative to cutter E in synchronization with the cross-wise movement of the cutter spindle, so that, such simultaneous movements of the cutter spindle and the work piece will be compounded into a resultant relative movement between the cutter E and the work piece R which will move the cutter over the circumferential surface of the work piece along a path precisely corresponding in direction and distance to and in precisely scaled reduction of, the path of the tracer.

The machine of the example embodiment has the capacity for handling Work pieces up to approximately forty inches (40") in lengths and from approximately six to twelve inches (6 to 12") in diameters, and is designed to effect a reproduction on the circumferential surface of a work piece of the master design on a pattern P at a reduction ratio of 2:1. The machine further provides as the maximum area which can be covered by the engraving cutter E at one setting of the work piece, an area of approximately five inches by approximately twenty inches (5" x 20"). In the usual roll engraving operations which are carried out on a machine of this general character, an entire design may be required to be engraved on and completely around and from end to end of, the circumferential surface of the roll or Work piece. In carrying out such an operation only a small segment or section of the entire design is required to be placed on a pattern P, so that, the complete surface of the roll may be engraved by repeating the pattern segment of the design around and along the roll. Repeating the engraving of the pattern segment of the design in order to cover the entire roll surface, is accomplished by indexing the work piece or roll as each segment is completed around the roll and by indexing the work table W longitudinally, that is cross-wise on saddle S, as each segment is completed axially or lengthwise of the roll.

It will also be evident that various other embodiments, forms, designs, arrangements and combinations may be resorted to without departing from the broad spirit and scope of our osa es 15 invention; andhence awe zdornotwish star-limit our invention in: all Jrespectszto: the specific: example embodiment; or to :the specific constructions and arrangementszthereof, except as may be required by: specific; intended :limitations: thereto appearemg anyvof the .claims hereto appendetk.

Whatwe claim is:

1;. .In. an: engraving :machine, .in combination; azsupporting; structure; a .rotatable, work: holder mounted; in; fixed position on said. supporting structure?amdzbeing-adapted to mount a. roll-like work. piece .zirr position with its longitudinal axis diSDOSBdVCIOSSeWlSGiOf the machine for rotation ofz' the.-workpiece; about such axis; a cutter spindle positioned "with its axis perpendicular to thei-axissof: workpiece-rotation; zmeans mountin saidlcutterrspindlea and constraining it-tomove-v mentseinrl either direction along a straight line pathiparal-lel': with; the: aXiSv'OI' work piece rota-v tion; a: pantograpirl linkage. pivotally connected on .a-nd; supported; from"; said cutter spindle mounting: means: and being I laterally; swingable about 1 and: in a. plane; perpendicular; to the: axis of said; spindle; a.tracer'connected-.-with said pantograplr: linkage in position with its; axis parallelwith' the axis of said cutter spindleuand being adaptedzltoz: be universally laterally; moved over." a; pattern 1 to I swing said linkage: laterally about the axis-of said-cutter spindle; mechanism for:rotating-saidwork holder; a pivotal connection .betweensaidworkholder rotating mechanism? and said piantograph' linkage providing, a pivot 1 axis spaced along said linkage from and parallel with the=axisofsaid cutter spindle; and said tracer, cutter spindle and-pivotal connection between. saidvlinkage and said work. holder rtating.;mechanism"being relatively mounted to her-maintained with the axes thereof in a straight line lying; in a common planer-passingthere through-in;a11-.positions of operation thereoflby saidztracerand pantograph linkage 2.. lnvantengraving machine; in combination; a.--. supporting structure; a. rotatable work holder mountedmin fixedposition on said, supporting structure. andv being adapted to mount. a [roll-like work piece in position with. its longitudinal axis disposedlcrossswise. of the machine for; rotation or. the work piece about-such. axis; a cutter spindle positioned with its axis perpendicularto the axis of workpiecerotation; meansmounting said... cutter. spindle for and constraining; it: to movements. in either. direction alongrawstraight line. pathparalleliwith the axis: of works piece rotation a. pantograph linkage pivotall-y connected onzand supported from said cutterrspindle mounting meanssin position for lateral swinging about; and a. plane" perpendicular to the axis 01% sa-idspindle; a. tracer. connectedlwith said pantograph-linkage and being, mounted for .universal lateral.:movements over apattern to cor;- respondingly: laterally swing said linkage; about the; axis-:of; said icutter spindle;- mechanism 1 for rotating, said: workholder; and .apivotal con.- nection between said work holder rotating mechanism. and said:.pantograph linkage: providingga pivot axis: spaced along said: linkage from' and para'llelewith theaaxisxof said cutterspindle;

3: In an" engravingimachine, in combination; ar-lsupporting, structure; a: rotatable work holder mounted inafixed position .on saidzstructure and being adapted to mount therein a, roll-likez-work pieceinzposition" with its. longitudinal axis ;disposed-icrossewisezof theLmachineiior rotationof the work. piece about, such .axis; .a cutter .spindle positionedwith itsaxis perpendicularto the-axis ctr work: piece notation; movableemeanszmounte ing said cutterrsspindlezandponstraininmit to movements incither, directionalong a straight line path parallelwith the axis of work piece rotation; a pantograph linkage, pivotally; supported in :posi-tion'for lateral swinging. iniaaplane perpendicular to. the: axis of said spindl'ey a. tracer connected. withsaid pantograph linkage. forsuniversal lateral 'movements over a pattern to correspondinglylaterally swing said linkage-:- saidi'pantographa llinkagebeing adapted to-.move saidlcutter-t spindle :along: its-straight. line. path-in sealed; relation to. and solely. bYi'HlOVGHlBDtSII of said tracerzalong straight-line paths parallel with the: axiszof .workgpiece rotation; mechanismwfor rotating saidrworlnholderr adjustableraticcome pensating means: pivotally/ coupled with; said pantograpmlinkaget for; actuation lby said: link? age, said ratio compensating means beinggalso operatively;-ccnneoted;with&said;workrholder.:rotatinglamechanism Efor;efiecting operation OfirSBid rotating -;mechanisrnv to; rotate; said work-. .holder throughrdegrees of'lrotation at a predetermined ratio to: and solely; by-niovements; of said. tracer along-:straightline. paths perpendicular to the axis of-iworlr pieceerotation; and said tracer,- cutterspindle and. pivotal coupling. between; said ratio compensating mechanism andsaid: linkage being relatively mounted to be. maintained. with the axes thereof in a straight line passing-thereth-rouglr ina-all positions -,of :operation thereof 4: .In an engraving machine; in combination; a supporting structure, a 1 rotatable- .worka holder mounted. in. fixed position. on saidsupporting structure and being: adapted. to .mount .a roll-like Work piecein position therein :for rotation-there.- by about its wlongitudinal axis; a, cutterspindle positioned .with. its axis perpendicular to. thelaxis oi?v work piece rotation andv being adapted-t0 mount at .its1work piececendcalcutter incutting relation with, thecircumierential surfaceaof "the work piece; movable carriage. meansv mounting said cutter, spindle, and. being constrained to movements. in either direction. along a, straight linepath parallel .withthe axisof lworkpiecerm tation;.. a... pantograph. linkage pivotally connectedonand.supportedlfrom saidi'cutter spindle carriage means in position. for, lateral swinging about and'ina. planeperpendicularto theaxis of Isaidl cutter spindle; a tracer connected'with said ,pantograph .linkageandfbeing mounted for universal; lateral. movements over, a. pattern to correspondingly laterally swing, said linkage; saidfpantograph linkage being adapted to move said. cutter. spindle in either direction. alongits straightlinepath of movement at "afixed "ratio relativev to. and solely byniovements'v of said tracer along straight'line paths parallel with-the axisof .'work piece rotation; im'echanismioperatively connected between said" rotary" work holder and said pantographlinkage forcausing rotation ofsaid" work holder by movements of said linkage effected solely bym'ovementsoisaid tracer along 'stra-ight li-ne paths perpendicular to the axis ofwork piece rotation; and 1 saidwork holder rotating mechanism including; adjustable ratio compensatingmeans forselectively setting said mechanism to effect degrees of rotation of saidlwork 'holderat a' predetermined ratio relativettonmovementsof'said tracer along straight line paths: perpendicular to the axis of work piece rotation'.

5.-= In. anlengraving' machine for engraving on and around-the --circumierential surfaces of. rolllikework pieces, in,combination; a. rotatable -work holder; ,a cutter spindlapositioned witliits axis perpendicular to the: axis of rotation: of said work holder; said cutter spindle being mounted and constrained for: movements in either direction-along a straight line path parallel with the axis of rotation-of said work holder; a :pantov graph linkage :mounted for lateral swinging :aboutand in a plane: perpendicularitouthe axis of saidcutter spindle; a tracervconnected with sa'idnpantograph linkage for universalvlateral movementsover a pattern to correspondingly laterallyswing said linkage a movable member mountedfor and constrained to movements :in :eithen directions along 1 a straight iline'spath perpendicular to the axis of rotation. of-said: work holder; a pivotal connection between said -movable member and said pantograph linkage ata location on the latter spaced therealong' from said cutter spindle; said tracer, cutter spindle and pivotalconnection being mounted with their :axes: parallel and maintained in a straight line lying in aeommony-plane passing throughsaid axes? and mechanism operatively connected betweensaid rotary work holder and-said movable member for effecting rotation of said work holder by movemen-tsof said member along its straight 'line'path.

-6. Inan engraving machine, in combination; a rotatable 'workholder; a cutter spindle posi- I tioned-with its axis perpendicular to the axis-of t rotation otsaid work holder; means mounting said cutterspindle' for: movements in either direction along and constrained to a-straight line path parallel with theaxis of work holder rotaitionLa pantog-raphlinkage pivotally connected I to and supported on said spindlemounting means for swingingdaterally about andini aplane perpendicular 'to-the axis of-saidspindle; a tracer amounted on/said linkage for universal lateral movements over a pattern to correspondingly lat- =-eral1y swing said linkage about its pivotal axison i. said spindle mounting means; a movable mem- -=ber mounted for and constrained to movements i int-either direction alongla straight-line'path-perpendicular to the path of movements ofsaid cutter spindle; said movablemember-beingpivotally "connected to said linkage; a carriage mounted 1 for. and constrained to movements in either direc- -tion along a straightline path parallel with. the path of movements ofSaid movablemember; a bar unit including a bar :member piv0ta1ly mounted'intermediate its ends between said movable member and said-carriage l for-swinging about an axis perpendicular tosthe paths of movement of said carriage and said member; said bar member being pivotally coupled at its opposite ends to. said movabl member and said car riage, respectively; and mechanism connected between said carriage and said. rotary work .lholder for-converting rectilinear movements of said carriage into r'otarymovem'ents of saidlwork holder.

"'7. In the combination as defined 'in""claim 6, said bar unit including; a pivotblock mounted "on' said bar member for movements 'ineitherdirection longitudinally therea'long to selected positions of adjustmentyand a pivot member mounted on said pivot block and being movable therewith and constituting the intermediate pivotal mounting for bar unit.

"'8. In the combination as 'defined in claimfipa drum mounted spaced from said carriage atthe side thereof opposite said bar unit and b'eing mounted for rotation in either direction about an axis perpendicular to the'path of straight line vmovements of said carriage: and-:fiexible band members connected tosaid carriageandbeing exi8 \tendedtoand oppositely-wound: on said-drum for converting. rectilinear-movements of said carriageinto rotary; movements of said: .drum.

1 9. In :the .combination as v defined in claim' fipa rotary: shaftamounted imposition withv its. axis disposed; perpendicular tot-thepath of straight linemovements oi said carriage; aidrum on and zinodriving connection-with.said shaft; means connecting said drum with said carriage for conventing rectilinear- :movementsi of the alatter to "rotaryt movements of isaid drum" and shaft; a second z'drum keyed on said shaft: in rotary driven connection. therewith; said work holder including a rotaryspindle and a ldrum mounted thereonuin-i driving connection therewith; and :flexible bandswoonneoted betweenv and at their oppdsite endsibeing-oppositely wound on said shaftimounted:seconddrum and said WOIkzhOldGI spindle-mounted drum for transmitting rotation iinireither direction of said second drum to said work: holder spindle mounted drum.

i 10.rIn an engraving machine, in combination; :axrotatable work holder; a. cutter spindle-positioned with its ax-is perpendicular to the axislof rotation' of: saidwork holder; means mounting said cutter spindle for movements in either direction: along: and constrained-to a straight line :-pathparallel"with the axis of work :holder rota- ;tion u a .rpanto'graph 1 linkage pivotally supported :onr; said spindle mounting means for swinging nlaterally'about and in a plane perpendicularato the axis of said spindle;-a tracer connected with said linkage and: being. universally laterally mov ablelovera pattern 'to correspondingly swing said linkage; ..a:: movable. member mounted f01'-- and constrained ito'rmovements in either direction lalonga straightwline path perpendicular -.to the axis of rotation of said work holder; a pivotal connection betweenand couplingsaid linkage to said? movable lmember; a carriage mounted for i andibeingconstrained to movements in eitherdirectionialong astraight line path parallelwith the pathof "movementscof-isaid movable mem- -ber; :a ratio compensating bar unit pivotally mountedtintermediateits ends and beingppivot- "ally coupledrat its :oppositeends to said movablemember and said carriage, respectively;-said bar: unit in'cluding, a i bar member, 1 a pivot block 'mounted thereon forumovements in eitherodi- "rection xtlongitudinally therealong to selected positions of adjustment, a pivot member mounted on said pivot block and being movable therewith and constituting the intermediate pivotal mounting for said bar unit, anda micrometer screw journale'd on. said bar member andbeing threadedly: engaged with-said pivot block; and v mechanism connected between said carriage and said rotary-work-holder for converting rectilinear movements of said. carriage into rotary movements of said work holder.

1 11." :In: the combinationas defined in claim 10, f a scale provided on-rsaid-bar-member along the "path of movements of said pivot block.

212."? In. an-engraving machine; in combination; a rotatable work holder; a cutter spindle; means mounting saidcutter spindle in position with-its axis perpendicular "to the axis of rotation ofsaid work holder; arpantograph linkage .pivotally supported on said 1 spindle; mounting rmeansi for swinginglaterally in a plane perpendicular to the axis of said spindle; atracer connected'with said linkage: and 1 being universally laterally movable to m'oorrespondinglyswing said linkage about its i pivotal: support on. said-spindle mounting means asuan axis; mechanismpperativelyconnecting said rotary Work holder with said pantograph linkage at a pivotal connection with said linkage spaced from the point of pivotal support of said linkage on said spindle mounting means for effecting rotation of said work holder in scaled relation to movements of said tracer in either direction along straight lined paths perpendicular to the axis of rotation of said work holder, and said pivotal connection between said mechanism and said linkage, said cutter spindle, and said tracer being relatively mounted with their axes in a straight line passing therethrough in all positions of operation thereof.

13. In an engraving machine, in combination;

a rotatable work holder; a cutter spindle; means mounting said cutter spindle in position with its axis perpendicular to the axis of rotation of said work holder; said cutter spindle mounting means constraining said spindle against movements in directions perpendicular to the axis of rotation 1.:

of said Work holder; a pantograph linkage of the parallelogram, jointed link type pivotally supported on said spindle mounting means for swinging laterally about the axis of said spindle as a pivot axis and in a plane perpendicular thereto; a tracer mounted on said linkage in position with its axis parallel with the axis of said spindle and being universally laterally movable to correspondingly swing said linkage about the axis of said spindle; a movable member mounted for movements along and constrained to a straight line path perpendicular to the axis of said spindle and to the axis of rotation of said work holder; a pivotal connection between said movable member and a link of said linkage :i

spaced from the point of pivotal support of said linkage on said spindle mounting means; and mechanism operatively connected between said movable member and said rotary work holder for converting rectilinear movements of said member into rotary movements of said work holder.

14. In an engraving machine for engraving designs on and around the circumferential surfaces of roll-like work pieces, in combination; a

rotatable work holder; a cutter head mounted for and constrained to movements in either direction along a straight line p-ath'parallel with the axis of work holder rotation; a cutter spindle journaled in said cutter head in position with its axis perpendicular to the axis of Work holder rotation; a jointed link pantograph linkage pivotally connected to said cutter head for swing- I ing bodily laterally about'and in a plane perpendicular to the axis of said cutter spindle; a tracer mounted on said linkage for universal lateral movements over a pattern to correspondingly laterally swing said linkage; a movable member work holder; a pivotal connection coupling said movable member to said linkage at a location on the linkage spaced from the point of pivotal connection of said linkage to said cutter head; and mechanism operatively connecting said rotary work holder with said member for converting rectilinear movements of said member into rotary movements of said work holder.

15. In an engraving machine for engraving designs on the circumferential surfaces of rolllike work pieces, in combination; a rotatable work holder; a cutter spindle positioned with its axis perpendicular to the axis of rotation of said work holder; movable means mounting and constraining said cutter spindle to movements in either direction along a stranght line path parallel with'theaxis of work holder rotation; a pantograph linkage pivotally coupled with said spindle mounting means for lateral swinging in a plane perpendicular to the axis of said spindle; a tracer connected with said pantograph linkage and being mounted for universal lateral movements over a pattern to correspondingly laterally swing said linkage; a first movable member mounted for and constrained to movements in either direction along a straight line path perpendicular to the axis of rotation of said work holder; said first movable member being pivotally coupled to said panograph linkage; a second movable member mounted for and constrained to movements in either direction along a straight line path parallel with the path of movements of said first movable member; a ratio compensating unit pivotally mounted intermediate its ends and being pivotally coupled at its opposite ends to said first and second movable members, respectively; said unit including a bar member, a pivot block mounted thereon for movements in either direction longitudinally there-along to positions of ad justment thereon, a pivot member mounted on said pivot block and constituting the intermediate pivotal mounting for said unit, and means for adjusting said pivot block; and mechanism connected between said second movable member and said rotary work holder for converting rectilinear movements of said second movable memher into rotary movements of said work-holder.

16. In an engraving machine, in combination; a fixed supporting frame structure; a rotatable work holder mounted in fixed position on said fixed frame structure and being adapted to mount a roll-like work piece in position with its longitudinal axis disposed cross-wise of the machine for rotation of the work piece about such axis; a rotary cutter spindle positioned with its axis perpendicular to the axis of rotation of the work piece mounted in said work holder; movable means mounting and adapted to constrain said cutter spindle solely to movements in either direction along a straight line path parallel with the axis of rotation of the work piece; a tracer mounted for universal lateral movements over a pattern; a jointed-link parallelogram linkage unit operatively connected to said tracer and to said cutter spindle in position extending therebetween for transmitting movements of said tracer along straight line .paths parallel with the axis of work piece rotation to said cutter spindle to thereby move said nism for converting rectilinear movements to rotary movement coupled to said pantograph linkage and to said rotary work holder for operatively connecting said linkage unit and work holder for effecting rotation of the latter solely by in and out movements of said tracer along straight line paths perpendicular to the straight line path of movements of said cutter spindle and its mounting means. Y

1'7. In an engraving machine for engraving designs on the circumferential surface of rolllike work pieces, in combination; a rotatable work holder; a cutter spindle positioned with its axis perpendicular to the axis of rotation of said work holder; movable mounting means; said cutter spindle being mounted on said movable mounting means; constraining means adapted to confine movements of said movable mounting means and said cutter spindle mounted thereon solely to movements in either direction along a straight line path parallel with the axis of work holder rotation; a panto-graph linkage unit pivotally mounted and suported on said movable cutter spindle mounting means in position for lateral swinging as a unit about and in a plane perpendicular to the axis of said cutter spindle; a tracer connected with said pantograph linkage unit and being mounted for universal lateral movements over a pattern to correspondingly laterally swing said linkage unit; a movable member; means adapted to constrain movements of said movable member to movements solely in either direction along a straight line path perpendicular to the axis of rotation of said work holder; a pivotal connection between said movable member and said pantograph linkage unit; an adjustable-length link unit pivotally coupled to said movable member; and mechanism operatively coupled to said link unit and being adapted to be actuated thereby by movements of said movable member in either direction along its straight line path of movement to cause rotation of said work holder.

18. In an engraving machine for engraving on and around the circumferential surfaces of roll-like work pieces, in combination; a rotatable work holder; a cutter spindle mounted in position with its axis perpendicular to the axis of rotation of said work holder; means movably mounting and adapted to constrain said cutter spindle solely to movements in either direction along a straight line path parallel with the axis of work holder rotation; a pantograph linkage unit pivotally supported for lateral swinging about and in a plane perpendicular to the axis of said cutter spindle; a tracer connected with said pantograph linkage for universal lateral movements over a pattern; a movable member; means adapted to constrain said movable member to movements solely along a straight line path perpendicular to the axis of rotation of said Work holder; a pivotal connection between and coupling said movable member with said pantograph linkage unit; said pivotal connection, said tractor and said cutter spindle being mounted with their axes maintained in a straight line lying in a common plane passing through said axes in all positions of operation thereof; mechanism for rotating said Work. holder; and means operatively connecting said Work holder rotating means with said movable member for converting rectilinear movements of the latter member into rotary movements of said work holder.

FREDDY STEINBRECKER. PETER M. HENKES.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 462,874 Hope Nov. 10, 1891 481,893 Bryce et a1 Aug. 30, 1892 1,874,046 Jonsson Aug. 30, 1932 2,110,873 Gorton et al Mar. 15, 1938 2,132,452 Zwick Oct. 11, 1938 2,357,627 Bentley et a1 Sept. 5, 1944 2,544,225 Hearle Mar. 6, 1951 FOREIGN PATENTS Number Country Date 484 Great Britain 1886