US2350704A

US2350704A - Routing machine

Info

Publication number: US2350704A
Application number: US413701A
Authority: US
Inventors: Albert E Schnable
Original assignee: Individual
Current assignee: Individual
Priority date: 1941-10-04
Filing date: 1941-10-04
Publication date: 1944-06-06
Anticipated expiration: 1961-06-06

Description

June 6, 1944.

A. E. SCHNABLE RUTING MACHINE Filed Oct. 4, 1941 4 Sheets-Sheet 1 ATTORNE June, 1944. v A. E.` sc'HNABLE' l 2,350,704

v ROUTING MACHINE Filed Oct. 4, 1941 4 Sheets-Sheet 2 INVENTOR ATTORN 1 June 6, 1944. Y A. E. scHNABLE 2,350,704

ROUTING MACHINE Filed 4, 1941 4 Sheets-Sheet 5 mi* INVENTOR ATTORNEY June 6,1944. A, E, SCHNABLE- 2,350,704A

RoUTImA MACHINE Filed Oct. 4, 1941 4 Sheets-Sheet 4 INVENTOR Y r' l v l ATTORNY Fig. 2 on an venlarged scale.

Patented June 6, 1944 UNITED STATES TENT OFFICE 11 Ciaims.

This invention relates to what is commonly referred to as routing machines, particularly ma'- chines of this type and kind designed to reproduce various forms and kinds of printing material, such as type, cuts, or printing workpieces of any kind for the purpose of reproducing the same or to produce reductions or enlargements thereof.

The object of the invention is to provide a machine of the class dened which is constructed in such manner as to produce accurate reproductions of a pattern in a workpiece, the latter being preferably in the form of a zinc plate, and in firm-r ly guiding and supporting the tracer stylus and the routing tool in the operation of the machine, a further object being to provide fooil actuated means in combination with hand actuated means for actuating the pantograph employed for supporting and guiding the stylus and tool in a predetermined ratio, one with respect to the other, in

producing the finished workpiece, product or mah trix; a further object being to provide means for regulating the depth of cut formed by the tool in the workpiece; a further object being to provide a tool supporting chuck having means providing free rotation of the tool therein and for circulating air through the tool to provide extremely high speed operation of the `tool and eliminate overheating thereof; and with these and other objects in view, the invention consists in a machine of the class and for the purpose specied which is simple in construction, eicient in use and which is constructed as hereinafter more fully described.

The invention as fully disclosed in the following specication of which the accompanying drawings form a part, in which several parts of my invention are indicated by suitable reference characters in each of the views, and in which:

Fig. 1 is a side View of a machine made according to myinvention.

Fig. 2 is asectional plane view substantially on the line 2,-2 of Fig. 1.

Fig. 3 is an enlarged detailed sectional view on the-.line 3 3 Iof Fig. 1.

Fig. 4 is an enlarged plane view of a part of the table portion of the machine showing the type or pattern supporting means of the machine.

Fig. 5 is a partial section on the line 5 5 of Fig. 4. f

Fig. 6 is a partial section on the line G-i of Fig. 5. f

Fig. '7 is a partial section on .Fig..8 is a vertical sectional. view sliylllsholder, which I employ.

-Fig. 9 is a section on the line 9 9 of Fig; '1.`

the une T-T of through the mounting end of one of the handled members,

which IA employ.

Fig. l1 is a section on the line Il-I I of Fig. 7.

Fig. 12 is a side View of the tool supporting chuck arranged in its support with partof the construction broken away and in sections.

Fig.A 13 is a vertical sectional view through the tool supporting chuck showing parts of the construction broken away and in sections.

Fig. 14 is a cross section on the line M-M' of Fig. 13.

While routing machines are old in the arts, generally speaking, and while efforts have been made in the past to produce routing machines for reproducing type or other kinds of printed matter, particularly in making enlargements or reductions thereof, machines of the later type and kind have not been put into commercial use by reason of the inability of such machines to produce accurate resultsin the iinished workpiece or matrix; part of the diflicultieshave Vbeen in the construction of the machine, generally speaking, to make the machines practical in vuse and more particularly machines of this type and kind have been impractical from the standpoint of a proper mounting and means for actuating the routing tool employed.

I have overcomeV objectionable features to ma chines of the type and kind under consideration by providing a simple and sturdy design of machine having substantially frictionless supports for the various operating elements of the machine, particularly the stylus and the workpecawhile at the same ,time producing .a machine wherein the mounting of the pantograph arms, type or pattern and the workpiece may be quicklyadjusted in the machine, as well as, in coupling and uncoupling the same with respect thereto. yStillflllther means is provided to produce Va substantially fricticnless rotatable mounting of the tool in the chuck body and for circulating air through the chuck body to prevent overheating thereof, thus providing for the highspeed operation of the tool.

The operation of my improved machine is further simpliiied by including foot actuated Vmeans for positively operating the pantograph Amechanism in two directions, thereby minimizing vthe hand operation of the stylus over the type or .pattern member, as well as, the movement vof the routing tool with respect to the workpiece or stylus y v In the accompanying drawings, I have illus? trated one adaptation of the machine, vin Fig. 1,

Fig. 10 is a sectional detailed View through the *55 i5 is the standardor the frame. oflthe machine lto -thetop of which is secured atablel having a 'transverse recess l1 in the upper surface thereof the forward wall I8 of which is bevelled and the rear wall I9 of which is perpendicular.

Supported upon the upper rear portion of the standard I in a suitable bracket or housing 20, is an electric motor 2|, on the shaft of which is a pulley 22, around which passes a belt 23. Extending vertically from the bracket or housing portion 20, is an upstanding tubular column 24. Clamped to the column 24 is a stub shaft 25 carrying a pulley 25 around which the belt 23 passes. Also on the shaft 25 is another pulley 21 around which passes a belt 28, which in turn passes around a pulley 29 on a shaft 30, supported in a tubular cross-head 3|, the latter being vertically adjustable in the top of the column -24 by an eccentric 32 rotated through the medium of a hand wheel 33 to raise and lower the cross-head. The cross-head is clamped in different positions of adjustment by a bolt 34 operating in elongated slots 35 formed in a depending sleeve 38 of said cross-head.

At 31 is shown any suitable type or kind of the inner end thereof, by heel and toe pressure applied to the treadle, the arms of the pantograph mechanism may be moved transversely across the surface of the table. In this way, the

5 hand operation of the stylus and tool, as later 38, for coupling the same with the drive shaft 30 and means, as at 39, for coupling the other end of the shaft with a tool supporting chuck or spindle housing 48, the spindle end of the ilexible shaft protruding into the chuck 40 as seen at 4I. Y Y

An adjustible nut 24a and split clamp ring 24h controls vertical adjustment of the column to tighten the drive belt 23, and the fbelt 28 is tightened by adjustment of the cross-head 3|, in the column. On the table of the machine, is supported a pantograph linkage 42 comprising, in the construction shown, four arms 43, 4 4, 45 and 46. Suitablle means is provided at 41 to adjustably couple the

arms

43, 45, and 44, 46 to increase or decrease the ratio of movement between chuck 40 mounted on the end of the arm. 46 and a stylus 48, supported in a stylus holder 49 mounted on adjacent pivoted ends of the` arms, 44--45. The arm 43 is adjustably pivoted upon the table I6 being radjustably clamped in ,a slotted plate 50 which plate is arranged in theV recess I1 of the table and retained in different positions of adjustment longitudinally of said recess by retaining wedge blocks 5I...` The other ends .of the arms 43-46 are pivotedly coupled as seen at 52. and the pivot coupling comprises a tubular casing 53, the lower contracted end of which supports a bearing ball 54 which operates overa smooth sheet 55 upon the rear portion of the table I6. This later construction provides free movement of the pantograph mechanism, or at least the arms of this mechanism, over the table of the machine and in conjunction with other guides and'supports later described, maintains this mechanism in substantially horizontal position.

YCoupled with the housing 53, is a swivelled link 56l which in turnY is pivoted to a link arm 51 extending upwardly-from one end of a rocker shaft 58 supported in bearings 59 at one side of the table of the-machine. The other end of the roc-ker shaft 58 has a depending link arm 68, to which is pivoted a long link 6I, the other end of the link 6I being pivoted to a link 62. Anotherlink arm 63 is arranged on the shaft of the arrn 62 and is pivoted to a depending link 64, pivoted at its lower end to a foot treadle 65. Thejtreadle/ 65 is pivoted centrally as seen at 66 toafforwardly extending-bracket 61 at the base `(f the standard. I5.` Itv will thus be, seen that` toy-,actuating the treadle to' raise or lower s described is materially relieved.

Substantially centrally of the table is adjustably supported a dish-like plate 68 held in different positions of adjustment longitudinally of the recess I1 by wedge blocks 69 similar to the blocks 5I. The upper surface of the plate 68 has a large recess 10, the bottom wall of which is provided with elongated apertures 1I, to guide a clamp bar 12 in its movement toward and from a block of type 13, or any other kind of pattern to be traced. vertically adjustable in the bar 12 is a threaded segment 14, note Fig. 4, movablle into and out of engagement with a feed screw 15, providing quick, as well as, slow adjustment of the bar 12.

By actuating lthe mill nut 16, the segment 14 may be raised out of engagement with the screw 15, in providing quick sliding of the bar 12, whereas when the segment 14 is in engagement with the screw 15, the bar 12 may be adjusted by rotating the knob 11, which in turn rotates a pinion 18 meshing with another pinion 1S on one end of the screw 15.

Slidably mounted in the recess 1D of the plate 68, is a backing bar 89 held against displacement by a screw 8i, which operates in an elongated recess 82 in the bar to provide for the adjustment ofV said bar through the medium of a feed screw 83. The screw 83 is operated through a knurled knob 84 mounted in one side of the plate 68 and on the shaft of this knobis a gear 85, meshing with the corresponding gear 86 on one end of the screw 83. (Note Figs. 4 and 5.)

I may also use in conjunction with the type 13 shims or spacing members 81 to position the type characters 88 comprising the letters MAY, in the plate 68. It will, of course, be apparent that the members 81 may be arranged at either side of the type 13 and Amay be of varying Adimensions similar to the use of slugs or leads in alining type in a chase or form.

With the plate structure 68 disclosed, it will be apparent that the type or other pattern element 13 may be adjusted to any desired position within the recess 16, by adjustment of the two bars 12 and 80 and by using one or more of the members 81.

Arranged at one side of the plate 68 is a workpiece supporting plate 89 also tting in the recess I1 and retained in diiTerent positions of adjustment in the recess by wedge blocks 96. The plate 89 has a recess 9| which corresponds in depth to the recess 18, that is to say, is type high particularly when the invention is used for the reproduction of type and other printing elements. The recess 9| is bounded on one sideV of the plate by a wall 92, note Fig. 2, which has a T-slot, therein to receive clips, such as the .clips 93 adjustably clamped in T-slots 94formed in the uppersurfaces of the front and rear walls of the plate, as clearly seen in Figs. 2 and '7. Clips are employed in the slotted wall 92 when a large workpiece-is supported in the recess 9|. In the present showing, a relatively-small workpiece 95 is illustratedV as supported in the plate 89 and retained-in adjusted position by the clips 93.

In the construction shown,`j the workpiece 951s to 'pcint'out that in routing the workpiece to formi the reproduction of the type or other pattern, thev or less frictionless bearing for the operating handles |00, both of which are of the same constructionv and one of which is coupled with the stylus supporting body 49, and the other with the chuck body'.

As both handle members are of the same construction the brief description of one is applied to both. Each handlemember comprises a tube i0 i, note Fig. l0, and in the inner end of the tube is secured an elongated bushing |02 forming a sliding bearing for the pin or rod portion |03 of a coupling |04. The coupling |04 is flanged beyond the limits of the tube |0| to t corresponding enlarged casing portions |05 arranged on the

members

40 and 49 and forming part of the pivot ends of the arms 44 and 40, one oi the casing portions |05 being illustrated in Fig. 12 of the drawings. The coupling |04 also includes a pin like bearing |06, which extends into the casing |05 to' reenforce the attachment of the handle therewith, the couplings |04 being secured to the casings |05 by screws |01, which are illustrated in Fig. 2 of the drawings. f

The pin or rod |03 is arranged eccentrically in the bearing l2, note Fig. 11, and arranged concentrically around the axis of the pin |03 on the flanged portion of the coupling are circumferentially spaced apertures |00, in one of which a pin Idd secured in the end of the bushing |02 is adapted to be placed. 'I'he handle member |0| is held in abutting relationship to the coupling |04 by spring arranged on the pin |03 and the tension of which is controlled by an adjustment nut I. In other words, the spring I0 holds the handle in operative keyedposition with the coupling. However, the handle may be moved outwardly against the tension of the spring ||0 to place the pin |89 in another of the apertures |08. With this construction, I provide means for vertically adjusting the position of the

members

40 and 49 independent of the adjustable mounting of the tool elements with respect to said members. The chuck i0 comprises an elongated casing ||2 having an upper enlarged and circumferentially ribbed end H3, which forms Va hand grip portion on the chuck. Arranged in the casing, in se-liealining ball bearings i i4 and l 5, is a spindle i i6. The upper end of this spindle has a recess l l1 to receive the flexible shaft coupling 4|, a key pin i3 being arranged in the spindle to engage a iiat side Vl IB on the end 4| to key the shaft with the spindle. The upper end of the spindle is trireaded to receive a Yretaining nut |29 which bears against the bearing ||4 and this threaded engagement is preferably made by a-left-hand thread structure. Another retaining nut |2| is mounted in the lower end of the casing ||2 and this nut is also preferably provided with the left hand thread.

Arranged -upon the Aspindle H6 between 'the bearings H4 and -||5 and rictionally engaging the spindle is "an'elongated circumferentially ribbed sleeve forming a ian |22. Thev ribs or blades |23 of the fan are mounted for free rotation'in the'bore of the. casing ||2. This `fanis employed to'circul'ate airfthrough the casing, cir-` culatingports being provided in the head |3, as seen at Y|24 and a clearance is provided as at |25 between the retaining nut |2| and a vclamp nut |26 arranged upon the lower split and bevelled chuck end |21 of the spindle.

The chuck end |21 of the spindle has an elongated tool receiving aperture to receive the shank |28 of a routing or other tool |29. It is also preferred, that the nut |20 be provided with a series of radial, as wel]v as, angularly disposed fan blades |39 which are employed to circulate air at the base of the chuck and around the tool to aid in the cooling properties, while at the Same time, t0 remove particles out vfrom the workpiece. Se

cured in the top enlarged portion ||3 of the cas-V ing, is a milled nut |3| which fits freely around the upper end of the spindle and the nut |20, as well as, around the coupling end 4| ofthe iiexible shaft. It will thus be seen that in the use of the self-alining bearings ||4| i5 proper alinement of the tool spindle is maintained at all times. It will also appear that free high speed rotation of the spindle and tool will be provided. The nut |3| has an upwardly extending split and externally threaded sleeve |32, the upper end of which is bevelled, as seen at |33 and the coupling nut 39 of the flexible shaft 31 engages the bevelled portion to firmly compress the split end of the sleeve |32 upon the casing of the exible shaft.

The stylus supporting member, in the construction shown, comprises a substantially cup-.shaped casing |34 having a large milled nut or closure cap |35 at its upper end in which is threaded a rotary bushing |30 having a milled or ribbed nut portion |31 recessed to form a seat for a coi! spring |38, which also seats upon the nut |35 This construction provides free adjustment of the stylus supporting 'spindle |39 inthe casing. The lower end of the spindle |39 is enlarged as seen at |49 and this enlarged portion is freely slidable in a reduced bore |4| formed in the lower portion off the casing |34. The lowerend of the is mounted an elongated split tool supporting chuck |43 heldin position by a'milled nut |44 and clamped by this nut around the stylus 48 in adjustably supporting the stylus in the lower Vend of the spindle |39.

Between the' end |40 and the bushing |36 a coil spring |45 is arranged upon the spindle and this spring permits'quick raising of the stylus 48 out of engagement with the pattern by moving the key lugs |43 at the lower end of a milled nut |41, securedto rthe protruding end of the spindle |39, Aupwardly through apertures |48 formed in the under cutor grooved portion |50 -of the bushing |36. This structure is more or less of 'a bayonet coupling. The lugs |46 normally' engaging the grooved portion |54 of the bushing as indicated in Fig. l9 of the drawings, and by afslight rotation the lugs arebrought into alinement with 0pposed recesses |48 and when in `this lposition the spindle may be raised against rthe tension ofthe spring |45 and the spindleV may-abe rotated to drop the lugs upon the upper end of the bushing. 'Ihis will hold the stylus ina raised position.

through the medium'orf bolts |l53,.notelFig. .12, the

other arm of the pantograph, for example theV arm 45, is free to rotate around the member 49 above the point of attachment of the arm 44 therewith. It is also preferred that the casings ||2 and |34 be of the same outside diameter, so that these members are interchangeable with the arms. In this way the routing tool may in some occasions, be located at the pivot between the arms 44 and 45 and the stylus supporting member arranged at the end of the arm 46. At this time, it will also appear .upon a consideration of Figs. 1 and 2 of the drawings, that the pivot end of the arm 43 includes a casing portion |05 similar to these portions as provided on the arms 44 and 46; thus making it possible to interchange the parts and to change relative positions, thereof.

The casing |05 of the arm 43 is clamped around a tubular member |54, the latter being freely rotatable about a pin |55 adapted to be adjustably clamped in the slotted plate lillV in changing the pivot position of the arm 43.

As will appear from a consideration of Fig. 8 of the drawings, the upper end 48A of the stylus 48 is rounded, and by reversing the stylus in the holder, this rounded end may be used in guiding the tool in performing the rough cutting or routing after the outline of the pattern element has been carefully made. The rounded end of the stylus will-keep the tool properly spaced from the fine definition in the resulting reproduction in the workpiece.

It will also be understood, that in certain instances, the spacing of figures or characters as appearing on the pattern element may be varied in the reproduction thereof, on the workpiece. For this reason, the ne adjustment is provided through the screw 83, the pica scale |56 being employed to gage picas and half picas, for example in the spacing of the characters MAY. As a matter of fact, by the two adjustments provided by the screw 15 and the screw 83, the pattern element may be shifted to entirely rearrange the subjects on the workpiece.

It wi1l also be understood,'that any type of pattern element can be used. In other words, printed or otherwise characterized sheets of paper or other material can havethe characterizations thereof reproduced. In some instances, type or printed matter as appearing on a sheet of paper can be reproduced by simply oiling the paper, so that the printed matter will appear through the reverse side of the paper, this use being particularly desirable in the printing art. In other arts perspective reproductions can be made.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A machine of the character described comprising a standard, a table at the upper end of the standard, the upper surface of the table having a transverse recess extending throughout the full length thereof, a plurality of supporting plates adjustable longitudinally of said recess, means adjustably clamping a patternv element in two directions in one of said plates, means adjustably clamping a workpiece in another of said,

ing body, a tool supporting body, said bodies be-' handle members to guide the stylus and tool with respect to said pattern element' and said workpiece. v f

2. A machine of the character described comprising a standard, a table at the upper end of the standard, the upper surface of the table having a transverse recesse extending throughout the full length thereof, a plurality of supporting plates adjustable longitudinally of said recess, means adjustably clamping a pattern element in two directions in one of said plates, means adjustably clamping a workpiece in another of said plates, a pantograph linkage comprising two pair of adjustably pivoted arms, means adjustably and pivotedly supporting one end of one of said arms upon the third of said plates, a stylus supporting body, a tool supporting body, said bodies being pivotedlycoupled, one with one end of another of said arms and the other with adjacent ends of two other arms, said bodies having handle members to guide the stylus and tool vwith respect to said pattern element and said workpiece, and means extending longitudinally of said table for supporting said handle members.

3. A machine of the character described comprising a standard, a table at the upper end of the standard, the upper surface of the table having a transverse recess extending throughout the full length thereof, a plurality of supporting plates adjustable longitudinally of said recess, means adjustably clamping a pattern element in two 'directions in one of said plates, means adjustably clamping a workpiece in another of said plates, a pantograph linkage comprising two pair of adjustably pivoted arms, means adjustably and pivotedly supporting one end of one of said arms upon the third of said plates, a stylus supporting body, a tool supporting body, said bodies being pivotedly coupled, one'with one end of another of said arms and the other with adjacent ends of two other arms, said bodies having handle members to guide the stylus and tool with respect to said pattern element and said workpiece, means extending longitudinally of said table for supporting said handle members, and a bearing plateV on the upper surface of the table and an anti-friction bearing member supported at pivot ends of the iii-st named arms in supporting the pantograph in its movement over the table.

4. A machine of the character described comprising a standard, a table at the upper end of the standard, the upper surface of the table having a transverse recess extending throughout the full length thereof, a plurality of supporting plates adjustable longitudinally of said recess, means adjustably clamping a pattern element in two directions in one of said plates, means adjustably clamping a workpiece in another of saidplates, a pantograph linkage comprising two pair of adjustably pivotedV arms, means adjustably and pivo-tedly supporting one end of one of said arms upon the third of said plates, a stylus supporting body, a tool supporting body, said bodies being pivotedly coupled, one with one end of. another of said arms and the other with adjacent ends of two Vother arms, said bodies having handle members to guide the stylus and tool with respect to said pattern element and said workpiece, means extending longitudinally of said table for Vsupporting said handle members, a

Ybearing plate on the upper surface ofY the\ table and amanti-friction bearing member supported at pivot ends'of the first named arms in supporting the pantograph in its movement over the table, and means comprising a foot treadle and a linkage coupledwith said pantograph to assist in the movement Aof the pantograph over the table of the machine.

5. A machine of the character described comprising a standard, a table at the upper end of the standard, the upper surface of the table having a transverse recess extending throughout the full length thereof, a plurality of supporting plates adjustable longitudinally of said recess, means adjustably clamping a pattern element in two directions in one of said plates, means adjustably clamping a workpiece in another of said plates, a pantograph linkage comprising two pair of adjustably pivoted arms, means adjustably and pivotedly supporting one end of one of said arms upon the third of said plates, a stylus supporting body, a tool supporting body, said bodies being pivotedly coupled, one with one end of another of said arms and the other with adjacent ends of two other arms, said bodies having handle members to guide the stylus and tool with respect to said pattern element and said workpiece, a ilexible drive shaft, means for actuating said shaft, and means in the tool supporting body for coupling the flexible shaft with said tool.

6. A machine of the character described comprising a standard, a table at the upper end of the standard, the upper surface of the table having a transverse recess extending throughout the full length thereof,v a plurality of supporting plates adjustable longitudinally of said recess, means adjustably clamping a pattern element in two directions in one of said plates, means adjustably clamping a workpiece in another of said plates, a pantograph linkage comprising two pair of adjustably p-ivoted arms, means adjustably and pivotedly supporting one end of one of said arms upon the third of said plates, a stylus supporting body, a tool supporting body, said bodies being pivotedly coupled, one with one end of another of said arms and the other with adjacent ends of two other arms, said bodies having handle members to guide the stylus and tool with respect to said pattern element and said workpiece, a vertical column protruding above the top of said table, a drive shaft supported at the top of said column, means involving an electric motor and relatively adjustable drives for actuating said drive shaft, and a flexible shaft for placing the drive shaft in operative engagement with said tool.

'7. In a machine of the character described employing a pantograph linkage comprising two pair of pivotally and adjustably coupled arms, a table over which the pantograph is movable, means adjustable on the table providing a pivotal mounting for one of said arms, means at the free end of said arm for adjustably coupling the same with said first named means, a pattern element support adjustable on the table, two means adjustably securing an element in said support, a workpiece supporting member adjustable on said table, means adjustably retaining a workpiece in said member, and predetermined arms of the pantograph having means supporting a stylus for operative engagement with said element and a tool for operative engagement with said workpiece.

8.111 a machine of the character described employing a pantograph linkage comprising two pair of pivotally and adjustably coupled arms, a table over which the pantograph is movable, means adjustable on the table providing a pivotal mounting for one of said arms, means at the free end of said arm for adjustably coupling the same with said rst named means, a pattern element support adjustable on the table, means adjustably securing an element in said support, a workpiece supporting member adjustable on said table, means adjustably retaining a workpiece in said member, predetermined arms of the pantograph having means supporting a stylus for operative engagement with said element and a tool for operative engagement with said workpiece, and the ends of the arms engaging said last named means being of common structure, and two like handle members adjustably coupled with said arm ends in controlling the height of the stylus and tool with respect to said element and workpiece.

9. In a routing machine of the class described, a pa-ntograph linkage for guiding a stylus and a tool in predetermined relation to each other, two elongated handle members, one for the stylus and the other for the tool, a support over which said handle members are movable in the movement of said stylus and tool, and each handle member having means rotatably adjusting the same on its axis to raise and lower the handle member with respect to said support in raising and lowering the stylus and tool.

10. In a routing machine of the class described. a pantograph comprising two pair of elongated and longitudinally slotted arms, means adjustably coupling said pairs of arms, means including a stylus holder pivotally coupling one arm of each pair, an anti-frictional guide pivotally coupling the other arms, the free ends of the last mentioned arms being provided, one with means forming an adjustable pivot on the machine, and the other with means for supporting a tool, means on the first named pivoted ends of the arms and the last mentioned arm end for supporting elongated handle members for axial rotation, and said last named means including means for adjusting the position of said handle members with respect to said last named means.

11. In a reproducing machine employing a pantograph controlling relative operation of a pattern tracing stylus and a workpiece forming tool, the combination with hand operated means for actuating said stylus and tool, of a treadle, a swivelled link pivoted directly to the pantograph, a link pivoted to the treadle, and a linkage supported on the machine coupling the first and second named links for placing the treadle in operative engagement with said pantograph.

ALBERT E. SCHNABLE.