US2583653A

US2583653A - Reproduction machine of the pantograph type

Info

Publication number: US2583653A
Application number: US68329A
Authority: US
Inventors: George M Keczeli
Original assignee: MARY M KECZELI
Current assignee: MARY M KECZELI
Priority date: 1948-12-30
Filing date: 1948-12-30
Publication date: 1952-01-29
Anticipated expiration: 1969-01-29

Description

Jan. 29, 1952 G. M. KEczr-:Ll 2,583,653

REPRODUCTION MACHINE OF' THE PANTOGRAPH TYPE l Filed Dec. 30, 1948 5 Sheets-Sheet l JNVENroR. George /MecZe/n avan', #M

ATTORNEYS Jan. 29, 1952 G. M. KEczx-:Ll 2,583,653

REPRODUCTION MACHINE OF' THE PANTOGRAPH TYPE Filed Dec. 30, 1948 5 Sheets-Sheet 2 l an INVENTOR.

George M ecZe/z Jan. 29, 1952 G, M, KECZELl 2,583,653

REPRODUCTION MACHINE OF' THE PANTOGRAPH TYPE Fild DSC. 50, 1948 5 Sheets-Sheet 5 H 'ww'l M,

A TTOP/VEVS Jan. 29, 1952 G, M KECZELI 2,583,653

` REPRODUCTION MACHINE OF THE PANTOGRRH TYPE Filed DSC. 30, 1948 5 Sheets-Sheet 4 s y l m ,a/ymb ATTORNEYS Jan. 29, 1952 G, M, KECZELl 2,583,653

REPRODUCTION MACHINE OF' THE PANTOGRAPH TYPE Filed DSC. 50, 1948 5 Sheets-Sheet 5 IN V EN TOR.

M, 'l 22W Arrow/EVS Patented Jan. 29, 1952 REPRODUCTION MAoHi-NE oF THE i PANTOGRAPH Tren George M. Keczeli, Colorado Springs, Colo., as-

sig'nor to Mary M. Ke

Colo.

czeli', Colorado Springs,

`Application: December 30, 1.948,1SeriarlNo. 68,329' Y 20 Claims.

My invention relates to a reproduction machine of the pantograph. type. It has `to do, more particularly, with a pantographic reproduction machine designed for reproducing Afrom amaster, such as a template pattern, drawing, or an actual article to be duplicated, an article of theasameor different size, by various forming operaticns. Depending upon the type of article to be` made and thematerial thereof, my machine may form the article by milling, cutting, planing, routing, drilling.,` grinding, hammering, engraving-or by various other operations. Regardless of the type of tool used in the formation of the article, lmy machine will effectively control and guide it to reproduce the article from the master in the same ratio or in a reduced or increased ratio.

Various pantographic reproducing machines have been developed. andused in the past. However, these machines have usually been designed for `delicate reproduction ofV small articles and are not suitable for heavy reproduction Work. The prior art machines have not been sufficiently rigid and sturdy to perform such heavy work as milling, planing, etc. These machines have usually included small Work-supporting tables and have been. limited in use to the producing of small articles which could be accommodated. by the tables. These prior art machines have usually included complicated driving mechanism for the forming tool which mechanism is generally so located as to interfere With free manipulation of the machine in the reproduction operation. Also, the drive has usually been of such a nature as to interfere with the necessary adjustments to change the ratios of the reproductions. Furthermore, the forming units of the prior art machines have not been mounted and counterweigh'ted properly to facilitate movement 'thereof even though the unit might be of a heavy sturdy type. With prior art machines, the necessary adjustments of the tracer unit and the forming tool unit relative to the master and work, respectively,4 have been diicult to make and it has been diiicult-to properly control and limit the feed of the tool into the work. With prior artmachines, the table is usually adjusted relative to the pantograph and this type of structure detracts from the rigidity of the machine. Prior art machines usually have not been so constructed as to make it possible to'interchange tools for various forming operations.

One of the objects of my invention is to provide a pantographic reproduction machine of simple ,structure and operation, and one which isivery 2 efficient, even when operated by an. unskilledv person,- for accurate reproduction work by `accurate control' of a forming tool of any ofV various types.

Another object of my invention is to provide a pantographic reproduction machine which is designed and constructed to be extremely rigid and sturdy so. that/it will be especially suitable tor heavy duty work, such asfheavy milling .planing, etc., and will still be ,accurate in controlling. such Work.

An additional oblject of. my invention is to provide a pantographic. reproductionmachine which though designed, to handle. heavy duty work can also handle light delicateivorhsuch as,. engraving,"

drawing, etc., andvvhich consequently, is a versatile machine whicl'ican-be used in almost any Work` Wherea master is provided "for reproduction.

A further object o'f my invention is to provide a pantographic reproduction .machine which is provided with a largesupporting 'table Ifor receiving the Work but which is so arranged that the formingtool unit can be moved to `a position alongside the table to Work on large heavy pieces of material disposed alongside the table..

:An additional object ofY my invention is to provide a machine of! the type indicated in the preceding. paragraph wherein thetable is rigidly supported in. a stationary position: and. the forming. unitand guiding unit are adjustable relative to the table and are movable relative to the table,

which provides for an extremel'y rigid 'work-supporting structure.

`Still another object vo'fmy .invention is to lprovide alpantographic reproduction machine. ofthe type indicated above which is. o'f'rugged structure for heavy duty Work butin which the forming unit is so arranged and* counterweighted as to facilitate the necessary controlled and guided movement thereof `in the. forming .op(-zr-ation.A

Another object of my invention is to provide a. machine ofr the type indica-ted wherein the drivefor the formingunitisso arranged as not tol interfere with any necessary adjustments. of the machine or with. the operationF of the machine;

A further object of-my invention is: toprovide a pantographicreproduction 'machine-including., a forming tool unitthexnovement of which is. controlledby atracer unitand wherein the. adjustment-of thetool. to the Work andthe tracer. to the master can be made Witheasefand: the feed of -the tool into. the Work can. be controlled` and. limited in a :proper manner.`

An additional object of my 'inventionl is to. provide a pantog-r'aphi'creproduction machine which porting the workpiece upon which theforming operation is to take place. The workpiece is attached to a plate which may berfastened rmly to the table at various locations, suitable guides being provided for aiding in locating it on the table. The master or template is adapted to be firmly secured to a supporting` plate or table which, in turn, is attached to the main table. Suitable guides are provided on the master table for locating the master 'thereon in various positions In addition, means is provided for adjustably securing the master table to the main table at either of `two diagonally opposite positions adjacent the ends of the table. These positions are such that in one position of the master table, the work produced on the workplate will be a direct image of the master on the master table, and in the other position of the master table, the work producedV onthe workplate will be an image of the master on the master table but will be swung around 180" relative to the master in the plane of the master or a plane parallel thereto.V

At one side of the table intermediate its ends, an upstanding supporting column is provided and its base is rigidly attached to the table. This column carres a supporting sleeve and mechanism is provided for adjusting the sleeve vertically on the column and for then rigidly clamping it to the column in adjusted position. 'I'he sleeve supports a jointed arm which extends over the table and ispivoted to the sleeve for horizontal swinging, movement. The outer end of this arm carries a Vforming tool unit anda driving motor which are arranged to counterbalance each other. Connected to the sleeve on the column is a second pivoted arm which extends outwardly over the table below the rst arm end which is also adapted to swing horizontally. The outer end of this arm is connected to a pantograph frame which is disposed horizontally and parallel to the table. The pantograph is also connected to the forming tool unit so as to control movement thereof relative to the column. The connections between the pantograph and the forming tool unit and between the pantograph and its supporting arm are adjustable so as to change the ratio of reproduction. The pantograph is also provided with a detachable arm which supports for vertical adjustment a tracer adapted tobe associated with the master. This arm is adapted to be disposed at diagonally opposite points on the pantograph, corresponding to either of the diagonally opposite locations of the master table on the main table. The forming tool unit is so designed as to permit interchange of various tools and includes means for gradually feeding the tool into the work and means for limiting the feed into the work.

The preferred embodiment of my invention is illustrated inthe accompanying drawings wherein similar characters of reference designate corresponding parts and wherein:

Figure 1 is a perspective view, partly broken away, of my pantographic reproducing machine.

Figure 2 is a plan view of my machine. YFigure 3 is a vertical sectional view taken along line 3 3 of Figure 2 through the supporting standard for the forming unit and pantograph unit of the machine.

Figure 4 is a side elevational view of part of the structure shown in Figure 3.

Figure 5 is a horizontal sectional View taken along line 5--5 of Figure 3.'

Figure 6 is a vertical sectional view taken substantially along line 6 6- of Figure 2 through the tool holding unit of my machine.

Figure 7 is a side elevational view of the structure ofpFigure 6.

Figure 8 is a vertical sectional View taken along line 8 8` of Figure 2 through the tracing pin unit or master follower unit of my machine.

Figure 9 is a vertical sectional View taken along `line 9-9 of Figure 2 showing the pantograph arm, which carries the tracing pin, connected to the pantograph at the side of the table where it is disposed when the reproduction is to be a direct image of the master.

Figure 10 is a vertical sectional view taken along line l-l of Figure 2 showing the pantograph arm, which carries the tracing pin, connected to the pantograph at the corner diagonally opposite to where it is connected in Figure 9.

Figure l1 is a vertical sectional view taken along line lI-I l of Figure 2 through the master supporting table carried bythe main supporting table.

Figure l2 is a vertical sectional view vtaken through the master supporting table at right angles to the section of Figure 1l.

With reference to thedrawings in Figures 1 and 2 I have illustrated my machine generally. It comprises a large elongated table i which is of rigid and sturdy construction, preferably being formed of metal. The table comprises the top 2, which is in the form of a thick plate carried by a suitable numbery oflegs 3 rigidly fastened thereto. For locatingY the workpiece on the top surface of the plate 2, a straight edge 4 is provided and may be bolted in any of a number of positions by means of the bolts 5 which are passed through pairsV of Vopenings S provided in such plate. Guide lines 1 correspond with the pairs of openings 6 and aid in locating the straight edge 4. The workpiece W is carried on a platen 8 which will be disposed against the straight edge 4. The platen S is adapted to be clamped to the table top by suitable clamping means, such as by screws 9 which can be passed into openings or slots (not shown) formed in the table top 2. y

The table top 2 is adapted to carry a master supporting table I. This table IE! is preferably in the yformof a thick sheet or plate of transparent plastic. The table Ii! is adjustably supported on the table top 2at one end thereof by means of a guide track or guide bar Il. This baz` ll is secured to guide brackets l2 at its ends, which depend therefrom and each of which is provided with a guideway i3 which slides on the adjacent edge of the table top 2. Thus, themember Il may be moved laterally of the table but can be xed in a denite position by means of the rod I4 which is anchored to one of the brackets I2 and which is provided with a clamping nut l5 threaded on its opposite end, it being understood that this'end of the rod loosely passes through the adjacent bracket i2. This structure is shown more in detail in Figure 12. It will be apparent that by operating the clamping nut l5, the brackets I2 may be clamped to the front 775 and rear edges of the table top 2.

The ltable `I Ais mountedfon the member-l t-for movement l'forwardly and rearward-ly lof the table top 2. For this purpose, the lower sur-tace loithe table `Hl is `provided with a guideway i6 adjacent one end thereof andextend-ing from its front edge to its rear edge, Aas `shown best in Figures l and 1l. The table lll-carries afclamping` bar Il on its lower surface `by means of a pair of depending `screw-s I6. This `bar will be. disposed belowthe bar H and- `transversely thereof and by tightening screws i8, the `table .lr6 can be clamped-to the `bar il. The table Illmay have several pairs of openings .i9 for receiving .the screws |18. IThus, it will be .ap-parent that the table I6 can be adjusted both rforwardly .and rearwardly of the. table. top2 .and also laterally of the table top. When desired., the .gu-ide bar Il may be slipped from .the one .endfoi the table top 2 and be slipped on other .end .of the vtable top 2l, for a purposeto. be .explained later, so.` that table .t0 will be. in a diagonally opposite position, at .the rear of the main table, asrshown. by the dotted lines in Figure 2.

The master supporting table ill is provided with a series of .pairs oi openings, 2d for receivg ing pairs of bolts. 2l `that are used to attach a straight edge 22 thereto. in various positions. The straight edge 22 isadapted to aid in locating a master supporting platen 2 3. This platen 23 will have the master M suitably secured thereto and may, be secured to the plate tgby any suitable `clamping nieansnsuchA as the clamping screws 24 passingr into any of the` number of sets of openings 2.5. provided in the table Il.

Secured to the table top `il ,at the rear edge thereof and intermediate the ends thereof, is a supporting

column

2,3. This column is yprovided with a base 2l', which is bolted by means oi bolts 28 to the table` top. 2,. The structure of this column is illustrated best in liguresl, 3, i, and 5. The column 2li: is .in the iorm of .a tube which is inserted in the. upstandingocollar 29 on the base 2l. A set screw .3d `retains the tube within` the collar. Slidably mounted on the exterior of the tube 26 is aA sleeve.. 3:1! which .is adapted to be moved vertically thereon. The sleeve 3l .is split and. is provided with a clamp. 32IV by. means oi which it may be clampedfto thecolumn 2-6. Whenthe clamp is released, the sleeve. can be movedz vertically on the, column `by means of a screw 33. This screw is rotatably carried in a cap. 34 which` is secured .in` the top of the column. This screw depends into the column and is p1o. vided with aA threaded lower end,which` passes through a threadedr `collar 35. .This collar 35n is provided with a radially extending portion. 36 which extends through a verticalA slot 31, `formed inthe column, The portion t6 is bolted by bolts 36a. to the upper end oi` the sleeve 3i. `Thescrew 33 is rotated by means of a` handle 3,5,keyed 'to the upper end thereof. It willl be Yapparent that; rotation of handle 39 will move the sleeve, 3i up or down on the column, the movement; being4 limited by the` upper andlower ends otthe slot, 3l; A lubricant hitting .33 is providediorisupplying lubricant tothe c ollar 3,5. The. upper end of the screw 33 preferably has a calibrated .dial 46 carried thereby for cooperating with an index point on the captl to indicate the vertical position of the sleeve 3J on the column- 26..

'Ilhe sleeve 3j! carried` by colurnnl, supports ior horizontal swinging movement` a jointed supporting' arrn` fil which projects `forwardly over table top,2: Thisarm includesa maintes. tion 5.2.` Quoted-bv. a vertcallpivot pin tito the forwardly projecting ears 44 .on `the upper and.`

x passes through the ends of the upper and lower portions oi thesectcn 4.2 oi the arm, being keyed therein as indicated at 46.. Pivoted to. the outer end of .the section 42 of the arm by a vertical pvot :pin 4T! is a second :arm section 46,. 'llhe lpivot 4.? is arranged substantially the same. as the. ,pin 143. and has4 the anti-friction bearings i9. associated therewith. The outer end ofthe varm section 4.6. carries the vertically disposed sleeve ,Eli of the .forming tool unit. Bolted to. the .side ot' the` arm section 48 adjacent its nnerpivotediendby means of boltsl (Figurez) isieleetric motor housing 52. The sleeve 5.6 ("l'igurel)4 has a. spindle 5:3 extending upwardly therefrom and .upon which is keyed a `multiple sheave 54. Similarly, `the motor .52 is provided with an upstanding drive shaft 55 which has a multiple sheave 55 keyed thereon. lThe sheaves 5.4: and l5.6 include sections of diierent diameters` `and are reversed relative to each other. Wzl-,th .this sheave arrangement any desired driving ratio. may be obtained by changing the position` of the driving belt il on such sheaves. 'The sheaves 54 and Siware interchangeable to reversev the ratio of speeds.

As `shown best in Figure 6, the spindle 53 is rotatably mounted in an anti-friction bearing 58 which is carried by cap 59 mounted on the upper end of `the sleevell. This spindle 53 extends. downwardly into the sleeve 50 and its lower ,l end is `carried by a second anti-.friction bearing 60. disposed within the sleeve 50 at a substantial distance below its `upper end. It will be noted that the upper end `of the spindle 53 is solid and is keyed by the key :6l to the sheave 54. However, the `lower end` of. the spindle 53 is hollow, being provided with the socket 62 for receiving the upper lend of a solid spindle 63. The spindle 63 isprovided with nuts 64 threaded thereon below bearing 66, and which rest on` an anti-.friction bearing `65. The `bearing 65 is disposed within the upper end of a second and smaller tube 66 which is mounted for telescoping movement withinthe lower portion of the sleeve 50. Within the lower portion of the sleeve 66, an anti-friction bearing 61 is disposed and the lower end of the spindle 63 passes therethrough and projects below the lower end of the sleeve 66. The lower portion of the spindle 63 is provided with an exterior shoulder 68 which will be drawn up against the bearing 67 by tightening thel nuts 64 against bearing 65. The upper end of the spindle 63 is splined to the spindle. 53 by a spline 69, which permits movement of the upperend of the spindle 63 in and out of the socket 62. This relative movement of`

spindle members

63 and 53 is necessary when the sleeve 66 is moved' into and outof the sleeve 50. The lower end'of the sleeve 56 is split and a clamp I0 is associated therewith to clamp the lower end of sleeve` 50 around the sleeve 66 or to releasesleeve 66 to permit vertical movement thereof.

For moving the sleeve 66 in and outl of the sleeve 50, a cam device 1| is provided. This cam device includes a cam 12 rotatably carried on a bushing T3 which is supported by a pin 14 extend'- ing radially `from the sleeve 50. The. pin.14. is threaded into a socket 15 intermediate the upper and lower ends ofsleeve 50. The cam 12 is provided with anarcuateslot 16 (Figure 7) which receives the bushing 17; carried'by-a pinne.. This pin 18 is threaded into the sleeve 66, as indicated 'Y at 19. The pin 18 projects radially outwardly from sleeve 66 through a vertical slot 86, formed in the sleeve 56 below the socket 15. The cam 12 is rotated around the axis of pin 14 by means of a knob 8| keyed thereto, as at 82. The knob 8| is alsorotatably mounted on the bushing 13, being retained in place thereon by the cap 83 of the pin 14 which engages a washer 84 that bears against an interior shoulder on the cap as shown. The cap 1| is provided with diametrically opposed openings 85 in its hollow outer end 86 through which a pin 81 is passed transversely. The pin 81 is provided with a removable knob end `88 to permit insertion of the pin in the openings 85 when removed. Surrounding the cap 83 of pin 14, is a compression spring 89 which bears against the washer 84 and the pin 81. The pin 81 may be slipped back and forth through the cap 8| and will be retained in position by the spring 89.

It will be apparent that if clamp 16 is released, the sleeve 66 may be adjusted in and out of sleeve 56 by rotating cam 12 through the medium of the lever pin 81. The amount of leverage desired for rotating the cam can be varied by sliding the pinv 81 transversely of cap 6|. Rotating cam 12 will move the pin 18 vertically in slot 86 and consequently, will move the sleeve 66 vertically relative to sleeve 56. The clamp 16 may again be tightened to hold sleeve 66 in any fixed position relative to sleeve 56.

The

spindles

53 and 63 and associated bearings may be 1ubricated by means of a lubricant-conducting bore 53a extending from the upper end of spindle 53 into the socket 62. Above the spindle 63 in socket 62, packing 96 may be provided. Below the lowermost bearing 61, a cap 9| is threaded into the sleeve 66 and will retain sealing rings 92 in position therein.

The lower end of spindle 63 is hollow and is provided with a socket 93 for receiving a split collet 94. This collet is provided with a tapered lower end 95 for cooperating with a similar taper on the socket 93 and is moved in and out of the socket by means of a collar 96 threaded on the exterior of spindle 63 at the lower, end thereof. The collet 95 is designed to receive in its socket 91any standard type of cutting, boring, or similar tool.

,The sleeve 3|, carried by column 25, also supports the pantograph |66. It will be noted from Figure 1, that the sleeve is provided with a depending bracket |6| bolted to the lower end thereof. This bracket is pivoted by a pin |62 to the rear end Vof a supporting arm |63. The forward end of the arm |63 is connected to the rear arm |64 of the pantograph frame |66 by means of a clamping and guide member |65. The arm |64 slidably passes through the clamp |65 which may be releasably clamped thereto by means of an operating screw |66. The member |65 is pivotally carried by a second clamping and guide member |61 which is mounted below the arm |63 but which has a guide portion |68 disposed in a` slot |69 which is formed along the length of the arm |03. The second clamp member |61 may be actuated by means of a screw |61a. Thus, the clamp member |65 may be set at any position along the supporting arm |63 and the arm |64 of the pantograph can be moved to any desired position in the clamp |65 which may then be actuated to clamp it in such position. The pantograph frame is further provided with the front arm ||6, the end arm I, and the end arm H2, which serve to form a parallelogram in the usual way. It will be noted thatl all of the arms the forming tool unit. As a part of this connection, the lower end of the sleeve 56, as shown in Figure 6, has an anti-friction bearing l5 mounted thereon which, as shown in Figure 1, is provided with an outwardly projecting lug H6. Bolted to this lug ||6, by bolts ||1, is a clamping and guide member identical with the clamp member |65, and which is actuated by a screw |9. When the clamp ||8 is released, the forming tool unit may be swung about the pivot 41 to move the clamp ||8 to any position along the arm ||2 where the clamp may again be actuated to grip such arm. Thus, the

point of connection of the pantograph frame |66 to the forming tool unit can be varied. This Y variation along with the variation of the connection of arm |63 to arm |64 and arm |64 to clamp |65, at the same time, will vary the ratio of reproduction, as will be apparent hereinafter.v

When the tracer supporting arm |26 is connected to the forward pantograph arm H6, the connection shown in Figure 9 is employed. At this time, the overlapping portions of the arms ||6 and |26 are in contact and a pair of clamping bolts |33 are passed through aligning openings formed therein and spacers |34 are associated with the opposite side of the arm ||6. However, when the arm |26 is attached to the pantograph arm at the rear of the pantograph as shown by dotted lines in Figure 2, the connection is made as in Figure 10. In this case, the bolts |33 are passed through a pair of aligning openings in the arms |26 and the spacers |34 being disposed between the overlapping portions of the arms so that the arm |26 clears the rear arm |64 of the pantograph frame. Thus, the tracer supporting arm may be mounted at either of two diagonally opposed positions to correspond to the selected position of the master supporting table` |6. To aid bar in supporting table I6, the table top 2 may carry an ad- ||8, which is practicallyV The lower end of the pin |2| is provided ,justable upstandingL screw |35 for. engaging the lower surface of table 2-at a point spaced to one side of bar With this arrangement, the table Il] can be. supported parallel? to table top 2. As will be apparent later, when. the table is at the forward corner, the. reproduction will be a direct image of the master in lesser degree, while when it is at the rear corner, the reproduction will be an image of the master which has been swung around 180 relative to the master in a plane parallel to the plane of the master.

It will be noted from Figure 1, that the master table I is provided with. a plurality of the 'openings I9 any of which not in4 use with clamp Il, may receive the tracer pin |2I, when it is d`esired to lock the pantograph frame to the table and to` prevent movement. thereof, for example, when the machine is not. in. use.

In Figure 6,. I have illustrated a drilling tool T inthe collet 94. However, it is to be understood that this collet may receive and retain any suitable forming tool,.,such as a cutting tool, a grinding tool, an air hammer, or any other suitable tool. Y

In using this machine, the workpiece. W is rst fastened to the table top 2 at the. center thereof.. This may be accomplished with` a vice or with clamping screws or if the workpiece is thin, it may even be pasted to the table top. In locating the workpiece, the straight edge 4 may be used and will serve as a guide for locating several identical workpieces on the table, successively. The ratio of reproduction is determined vor selected and the connection of the pantograph IBD to the supporting arm |03 'and the connection of such pantograph tothe forming tool unit sleeve 5U. are adjusted to properly position the tool and tracer relatively to obtain this ratio. If the master table itl is positioned, as indicated in full lines in Figure 2, the image reproduced on the workpiece will be a direct image smaller than the master. On the other hand, if the master table I0 is positioned, as indicated in dotted lines. in Figure 2,

the image reproduced on the workpiece will be swung around 180 relative to the master in a plane parallel to that of the master. This latter image may be smaller or larger than the master depending upon the position of the arm |04 of the pantograph in the clamp |85.. The template or master M is formed or selected and is positioned on the table I0, being suitably secured thereto, as` previously indicated, the straight edge 22 aiding in locating the template.

In setting the ratio onthe pantograph |00, the

forming tool is roughly set over the center of the workpiece. The master table I0 is adjusted forwardly and rearwardly on the bar and laterally on the table top until the master M is suitably located under the tracer pin |2| where `it is clamped. By operating handle 39, when clamp 32 is released, the supporting sleeve 3| is moved vertically on the column 36v to move the forming tool unit and pantograph vertically. The sleeve 50 is raised in this manner to such an extent that by releasing clamp 'ill thereof and operating the cam lever 8l, the sleeve 65 can be lowered until the pin "i8 contacts the lower end of" slot 80.

The handle 39 is now again operated in order to lower the forming unit until the forming tool T touches the workpiece, which is the point where the cutting or other forming operation starts. The cam lever 81 is now actuated to move the sleeve $6 to its uppermost position and raise the cutter from the work. The handle 39 is set on zero position and is then rotated to lower' the forming tool unit to the depth indicated on dial 40, which will be the selected depth oi cut into the workpiece. The clamp 32 is now actuated to clamp the sleeve 3| in xed position and, therefore, hold the sleeve on the forming tool unit in a fixed vertical position. At this time, the tracer pin |2| is adjusted down until it contacts firmly with the master-supporting plate 23. If the machine is now started and the tracer pin is held against the template and moved` therearound and if the sleeve 5B, which supports` the cutting tool is gradually lowered by means of the cam lever 81, the cutter will cutiinto` the workpiece to the proper depth-g whichn is determined by the pin 18 contacting the lower end of the slot B0. Thus, the master M will be produced in the workpiece W in the properl ratio. With the same setting of the machine, any desired number of articles can be reproduced from the same master.

When the machine is to be used on a large heavy object which cannot be supported on. the main table, such object can be disposed directly behind the main table. The tracer arm |20 will be in the position on the pantograph frame |00 shown by the dotted lines in Figure 2. However, the column 2E will be `turned in socket base 21 until the pantograph frame and associated parts are completely behind the main table, the arm |20 then extending forwardly over the right-hand side of the main table. So as to cooperate with the tracer point |2| on `arm |20, the master table ID will be disposed on the right-hand side of the main table and will be disposed on track bar adjacent the rear end` thereof so as to be at the rear side of the main table. l

It will be apparent from the above description, that I have` provided a pantographic reproduction machine having many desirable characteristics. A number of advantages of my machine have been discussed above and` others will be. apparent. I

Having thus described my invention, what I claim is:

1. A pantographic reproduction machine comprising a support, a master supporting unit, a workpiece supporting unit, means for attaching Said master supporting unit and means for attaching said workpiece supporting unit to said support, a pantograph frame attached Ato said support for movement in a plane parallel to the master and workpiece supporting units, a forming tool unit connected to said support for movement in aplane parallel to the plane of saidsupport and connected` to said pantographk frame so that its movement is controlled thereby, a tracer carried by said pantograph frame forcooperation with said master, said means for attaching said master supporting unit to. said support permitting attachment thereof to the` support at either of two diagonally opposed loca-tions at. opposite sides of the workpiece supporting unit., and means for attaching` saidl tracer at either of` two diagonally opposed points to` said pantograph frame for cooperation with said master in its selecte position.

2. A machine according to claimV 1 whereinthe means for attaching said master supporting unit to said support comprises connections between said. master supporting` unit and said support which permits adjustment of said master supporting unit relative to the support in all directions in a -plane parallel to said pantograph frame iat either of the positions of said unit.

assaes 3. A machine according to claim 2 wherein the connections between the pantograph frame and the support and between such frame and the tool unit are adjustable to vary the ratio of reproduction.

4..A machine according to claim 3 wherein the forming tool unit and the pantograph frame are connected to said support for simultaneous adjustment in a plane perpendicular to said support.

5. A machine according to claim 4 wherein the tracer is adjustable in a plane perpendicular to the pantograph frame.

6. A machine according to claim 5 wherein the forming tool unit includes a tool holder adjustable at right angles to the plane of movement of said unit.

7. A machine according to claim 6 wherein means is associated with said tool unit for feeding the tool at right angles to its plane of movei ment and means is provided for limiting the extent of such movement. 8. A pantograph reproduction machine com prising a horizontally disposed supporting table,

a master supporting unit, a workpiece supporting unit, means for attaching said workpiece supporting unit to said table, means for attaching said master supporting unit to said table at either'of two positions on opposite sides of the workpiece, said last-named means permitting l universal adjustment of the master supporting unit relative to the table, a supporting column attached to said table, a pantograph frame attachedto said column for swinging movement in a horizontal plane parallel to said table, a

forming tool unit supported by said column for movement in a horizontal plane parallel to said table, and connected to said pantograph frame so that its movement is controlled thereby, a

tracer pin carried by said pantograph frame and cording to claim 9 wherein means is provided for clamping said plate to said guide rail at a selected position, said guide rail being supported by guides cooperating with the opposed edges of said table, and means associated with said guide rail and connected to said guides for clamping them to the edges of said table.

, 11. A machine according to claim 10 wherein a supporting member is provided on said column for supporting said pantograph frame and said forming tool unit, said pantograph being carried by an arm pivoted to said member for horizontal movement and said forming tool unit being carried by a parallel arm pivoted to said member for horizontal movement, and means for vertically adjusting said member on said column.

12. A machine according to claim 11 wherein said supporting member is a split sleeve and 12 clamping means is associated therewith for clamping it to the column. V l

13. A machine according to claim 12 wherein the means for adjusting the sleeve on the column comprises a screw anchored on the column and engaging a threaded member carried by the sleeve.

14. A machine according to claim 13 wherein the pantograph frame is connected to its supporting arm by a clamp member adjustable along the associated arm of the pantograph frame and adjustable along the pantograph frame supporting arm, andwherein the tool unit is connected to another arm of the pantograph frame by a clamp member adjustable along said arm.

15. A machine according to claim 14 wherein the forming tool unit is supported on its supporting arm for vertical movement relative thereto, a tool carried bysaid forming tool unit, means carried by said arm for actuating the tool, means for feeding the tool downwardly, and means for limiting the extent of its downward movement.

16. A machine according to claim 15 wherein the actuating means comprises an electric motor which drives the forming tool which tool is rotatably supported by said forming tool unit, said forming tool unit and said electric motor being disposed at opposite sides of the arm of the supporting unit so as to counterbalance each other.

17. A machine according to claim 16 wherein the forming tool unit comprises a vertically disposed sleeve, a second sleeve slidably disposed within the rst sleeve, means carried by the second sleeve for supporting the tool, means for moving the second sleeve downwardly relative to the rst sleeve to feed the tool into the work, and means for limiting the downward movement of the second sleeve. Y

18. A machine according to claim 17 wherein the means for moving the second sleeve downwardly comprises a cam connection between the first and second sleeves, said cam connection including a pin carried by one of the sleeves and extending into a vertical slot in the other sleeve to limit relative vertical movement thereof.

19. A machine according to claim 18 wherein the first sleeve is split and has the second sleeve disposed therein and is provided with a clamp adjustable to clamp it around the second sleeve.

20. A machine according to claim 8 wherein the master supporting unit comprises a plate having a straight edge adjustably mounted thereon and wherein the supporting table is provided with a straight edge adjustably mounted thereon for cooperation with the workpiece.

GEO. M. KECZELI.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,684,216 Donovan Sept. 11, 1928 2,067,962 Zwick Jan. 19, 1937 2,426,156 Schabot Aug. 19, 1947 FOREIGN PATENTS Number Country Date 535,685 Great Britain May 23, 1941