US1893957A

US1893957A - Carving machine structure

Info

Publication number: US1893957A
Application number: US264650A
Authority: US
Inventors: Gustave A Parten
Original assignee: Individual
Current assignee: Individual
Priority date: 1928-03-26
Filing date: 1928-03-26
Publication date: 1933-01-10
Anticipated expiration: 1950-01-10

Description

`m. l0, 1933. G, A, PAR-[EN 1,893,957

CARVING MACHINE STRUCTURE Filed March 25, 1928 4 Sheets-Sheet l Jan. 10;.1933. Q A, PARTEN 1,893,957

CARVING MACHINE STRUCTURE Filed Mallen 2s, 192s 4 sheets-sheet 2 Jan. 10, G' A, PARTEN CARVING MACHINE STRUCTURE Filed March 25, 1928 4 Sheets-Sheet 3 Jia Jan. l0, 1933. G, A. PARTEN cARvING MACHINE STRUCTURE Filed March 25, i928 4 Shee'CS-Shee 4 Patented Jan. 10, 1933 UNITED STATES GUSTAVE A. PARTEN, OF MINNEAPOLIS, MINNESOTA CARVING MACHINE lS'I."R`I.'J'CTURE applicati@ mea March 26, 192s. serial No. 264,650.

My invention relates, generally speaking, to tool operating machines and, speaking specifically, it primarily relates to engraving machines of the type disclosed in the expired U. S. patent to Emil R. Lochman, No.

I01,903, of June th, 1902; and my invention has for its primary purpose to provide improvements in that type of engraving machines with a view of securing greatly in- 10 creased capacity and greater. eiciency in the working of the tools and greater-ease and reliability in the handling of the tool carriage; and, to these ends, my invention consists of the novel devices and combinations of devices hereinafter described and pointed out in the claims.

My'invention in its preferred form is illustrated `in `the accompanying drawings wherein like notations refer to like parts in the several views; and in said drawings Fig. 1 is a top plan view of the machine embodying the invention, the same being somewhat shortened and shown with a comparatively small number of tools;

Fig. 2 .is a vertical section taken on line 2-2 of Fig. 1 as indicated by the arrows;

Fig. 3 is a view in end elevation of the machine;

Fig. 4. is a vertical section taken substantially on line 4 4 of Fig. 1 as indicated by the arrows and shown on anenlarged scale; Fig. 5 is a vertical section taken on line 5--5 of Fig. 4 as indicated by the arrows;

Fig. 6 is. a top plan view of a portion of the machine shown on an enlarged scale;

Fig. 7 is a vertical section taken on line 7 7 of Fig. 6 as indicated by the arrows;

Fig. 8 is a partial plan view of the carriage roller construction; y Fig. 9 is a view in side elevation of said roller and guideway construction;

Fig. 10 is a partial plan view showing a modified form of theinvention; 5 Fig. 11 is a vertical section taken on line ll-llof Fig. 10. 1

And Fig. 12 is a centralvertical section through the wheel and roller shown in Fig. 8,

and also through the tubular arm supporter 30 and the ball race located betweenthe shaft 29 `Yand the said arm supporter 30.

No novelty is considered to reside in the offsetting` of the hub of the wheel 236 in a recess of the roller 23.

Referring to the drawings, a machine is shown comprising a frame having the cud members 20 which are suitably connected together by cross ties extending transversely of the machine, such as the cross tie 22, near the backvof the machine, clearly shown in Figs. 1 and 3' of the drawings. G9

Said end frame members 20 include platelike castings 20aprigidly securedto the other parts of the frame and extending upward beyond the level ofthe work table of the inachine; and on the upper ends or edges of this plate-like castings 20a are secured track rails 206, best shown in' Fig. 9 of the drawings, which rails 20?) are made of vcomparatively thin strips of steel rigidly secured to said frame plate casting 20a. Grooved wheels 23?), two in number, are supported, one on each of said pairs of rails 20?) and adapted to roll over the same and be held propcrl,v spaced apart thereby. The said wheels 22521 are loosely mounted on the shaft 29, one at u each of the opposite ends thereof, as best shown in Figs. 8 and 12. Ball races 28 are located between the ends of the tubular arm supporter 30 and the shaft 29, as clearly shown in said Fig. 12. In View of the said position of the said ball race 28, the said shaft 29 can turn independently of the tubular arm supporter 30, and this supporter 30 and the outer sections of the ball race can turn on the inner sections of the race independently, and if need be, in opposite directions to the turning movement of the lshaft 29 at any instant of time. As already stated, the two grooved wheels 23?) engage the two o tracks 20?) and are guided thereby, and, because of the flanges on their grooves, are held. against any lateral motion on the shaft 29, or, in other words, are held properly spaced apart transversely of the machine. The said grooved wheels 236 hold the shaft 29, and, together with the ball races, also hold the tubular arm supporter 30 at the proper height above the said tracks andthe work table of the machine.

10o Directly along side of the grooved wheels 236, on the outer ends of the shaft 29, are mounted band wrapping and alinement rollers 23 detachably but rigidly secured to the shaft 29 in any suitable way, as by jamb screws 29a. The said rollers 23 do not contact with the rails 206, but clear the same, being laterally spaced outward of said rails. Two thin flat steel bands 24 are applied to the peripheries of these two wheels 23, parallel with and slightly spaced apart from each other, with their inner ends secured to the wheels, in peripheral depressions 23a formed therein, the fastenings, as shown in Fig. 8 of the drawings, being done by screws 24a. These bands 24, each make a wrap about their supporting roller 23, and the outer end of one of these bands 24 is secured to the upper end of a little hinged arm or lever 25, the lower end of which is pivoted or hinged to lugs 20c supported by the frame plate 20a. The corresponding end of the other of these tv; i bands 24 is secured to the upper end of a flat spring 27, the lower end of which is secured to the upper end of a corresponding little arm or lever 25a. pivoted to the lower end of a corresponding lug 20c depending from said -frarne plate 20a. Headed screws 26A extend through the little lever arms 25 and 25a and react against the bodies of the lugs 20c for adj ustably positioning the upper ends of said lever arms 25 and 25a for proper co-operation with the bands 24. These parts and their relations to the bands and the rollers 23 are best shown in Figs. 8 and 9 of the drawings. The fiat springs 27 are of such shape and so applied that they tend to force the ends of the particular bands 24 secured thereto outward and hold the same under uniform tension, and, when necessary, will allow the said bands to yield enough to permit the wraps of the bands about the roller to be made without breaking the bands. In other words, one of the two bands at each of the opposite ends of the carriage is yieldingly held by the said springs 27 for keeping all of the bands under proper tension and preventing the breaking of any thereof.. In view of this structure and dirposition of the said two bands 24 on each of the rolls 23, at the opposite ends of the carriage, the two bands on each roller never cross, or interfere with each other, and in virtue, of the two rollers 23, one at each of the opposite ends of the carriage and the said two bands 24 applied as described, true alignment of the parts is always maintained, while said bands hold the carriage on its track and limit the travel of the same.

The purpose of having at each opposite end of the/ carriage, the independent rollers 23 and wheels 236 mounted, as above described, so that the grooved wheel 236 is loose on the shaft 29 and can turn on that shaft independently of the rotary motion of 'the belt-carrying alignment roller 23, is to avoid the skiddmg which would otherwise occur in the travelof the carriage in either direction, when the bands 24 have made more than one wrap around their respective rollers 23, as such wrapping will make the diameter of that roller 23, measured through the wrapped bands, greater than before the wrapping of the bands occurred, and thus also greater than the diamenter of the grooved wheels 236 which travel on the tracks 206. In other words, the presence of these two elements 23 and 236, mounted as described, aords a compensating device which will enable the bands 24 properly to do their work without any skidding of the carriage supporting wheels 236 under the manual manipulation of that carriage, and the parts carried thereon, by the operator. This is an important improvement in this class of machines. It not only enables the carriage to be more easily manipulated, but it insures a higher degree of accuracy in the work of the carving tools than could be otherwise secured in this class of machines.

Brackets 31 are bolted to the rear side of shaft 30 having horizontally extending upper and lower portions with conical recesses in their tops and bottoms for receiving the pointed ends of screws 32 extending through the tops and bottoms respectivel of arms 33, said screws being held in fixe position by .the jamb nuts 32a. The arms 33 are of openwork form as shown in Fig. 7, having downwardly and forwardly extending top ortions terminating in a hub 33a. The hu 33a is bored to receive a s indle 34 suitably carried in a ball bearing 35 is osed on the top of hub 33a and in the bore o said hub, said spindle being held in lace by suitable nuts 36 and having a tool cliuck 37 at its lower end adapted to receive the tool 37a. Oil or grease cups 38 are disposed at the to of bearing 35. The arms 33 are embraced adiiacent their forward ends by yokes 39 having screws 40 at their tops and bottoms having pointed ends seated in depressions on said arms, whereby said arms are pivotally engaged between said screws. Yokes 39 are connected by removable sleeves 41 so that said yokes and sleeves form a rigid cross bar connecting the ends of arms 33, whereby all of said' arms may be swung by movement of said frame about the axes extending through the screws 32. There are also brackets 42 disposed midway between each pair of brackets carryin the arms 33 which receive screws 326 simi ar to the screws 32 and also held by jamb nuts, which screws 326 extend through the top and bottom of the short brackets 42, whereby said latter brackets are swingable about the axes of screws 326. The brackets 42 have a rear vertical surface to which is bolted the flange 43a of an electric motor 43, the driving shaft of said motor extending downwardly and having secured thereto a ianged pulley 44. A plate 45 engages the bracket 42 at the under side thereof, the same being guided in a slot 42a formed in a depending portion 420 of bracket 42 and being further guided by having a pin 45a projecting upwardly therefrom extending through a slot 42?) in the-front end of the bracket 42. Said plate 45 has a depending lug 455 in which is secured the front end of a rod 46 extending rearwardly through the depending portion 420 and having a head at its rear end against which presses one end of a coiled compression spring 47 surrounding said rod and bearing at its other end against portion 420. Spring 47 thus tends to pull rod 46 and hence plate 45, rearwardly. The plate 45 carries at its front end on a depending stud a .pulley 48 having a ange at its lower edge, an oil or 'grease cup 49 being shown above said plate for lubricating the bearingof said pulley and stud. Bracket 42 is connected to one of the adjacent arms 33 by a link 50 pivotally connected to both brackets by suitable screws.` The spindle 34 has secured thereto within the hub 33a a pulley 52 and a belt 53 runs over the pulley 44 of the motor 43 and from thence extends forwardly` to the pulleys 52 on the arms 33 at each side of bracket 42 and then extends rearwardly and passes around pulley 48.v The said pulley 48 and spring actuated slide 45 and the mountings of said parts constitute an automatic belt tightener which is always operative to hold the belt 53 taut under proper tension when in working position. For large carving machines of this Lochman type, to wit, any machine employing more thanl ten or twelve spindles, it is necessary to reinforce the transverse member 30 ofthe carriage in some way which will prevent the sagging of that memberunder the load carried thereby. I apply a truss of special structure designed by me to meet this particular problem. This truss is best shown in Figs. 1 and 2 of the drawings, but also appears in Fig. 6 of said drawings. For the compression member of this truss, I employ a strong metallic tube of substantially the same lengthas the transverse member 3() of the tool carriage, which, as shown, is made up of the sections 54 connected by T sections 54a, but which might be made of a continuous open-ended tube of the requisite strength. The ends of this metallic tube or compression member are seated in the upper ends of strong upright brackets 55 which are rigidly secured to the ends of the transverse member 30 of the tool carriage, as clearly shown in Fig. 2. The said compression member of the truss is of bowed form, and the said brackets 55 support the same above the transverse member 30 in a common plane with the axis of said transverse member. A series of adjustable hangers 56 connect intermediate portions of said compres- `transverse member; and hence, said brackets 55 might properly be called buttressing brackets. The adjustable hangers, as shown, are in the form of rods having their lower ends secured to said transverse member 30, and having their upper ends screw-threaded and extending through the Ts 545 of the compression member kof the truss, and equipped with nuts at their upper ends by which the rods may be drawn up to set the.

compression member under the camber desired. These hangers 56 might, of course, take other forms capable of producing the function. above stated. Being of tubular form, as above stated, the said compression member of the truss is adapted to serve also as a housing for the current conducting Wires that supply the electric motors used on this machine to drive the spindles. This trussing of the said member 30 is of large importance in this carving machine, especially so in machines employing a large number of spindles, as will hereinafter bemore particularly pointed out.

It will be noted that one arm 33 is provided at the central portion of the machine and this arm will be provided at its forward end with a guide tool instead of a cutting tool 37. The arms 33 a't'either side ofthe central arm 33 have secured thereto and extending inwardly therefrom segmental brackets 57 having inner curved surfaces substantially concentric with the pivoted screws of the arms 33 to which they are connected. Each bracket has secured to its rear side a strip 58 of exible material, which extends forwardly and is secured to the bracket 57 on the other arm and specifically to a hinged member 59 which is adjustable in relation to the bracket by having a threaded headed screw 60 pass therethrough and engage the side of its respective bracket. strips 58 is disposed above the other. With the construction described it will be seen that if one of the arms 33 at one side of the central arm 33 is swung laterally, the arm at -the other side of the central arm will be swung in the opposite direction. At such time one of the sections 41 between the central arm and adjacent arm will have to be removed. v

rlhe machine is provided with guide rails 61 which are arranged to be raised and lowered, and for this purpose the same `has se- One of the' cured thereto and depending therefrom four screws 62 disposed at the corners of the machine and guided in lugs 20d on end members 20. Nuts are rovided through which the screws 62 pass, t e same being carried in lugs 20e and having gears thereon adapted to mesh with the worm gears 63 secured to operating rods 64 journaled in the auxiliary bracket 65 bolted to lugs 20e. The rods 64 extend at each end of the machine and are equipped at their rear ends with gears 66 which mesh with gears 67 secured t0 the ends of rod 68 journaled in suitable brackets 69 secured to the rear end of the rods 64. The rods 64 at their forward ends are-adapted to receive cranks 70. It will be seen that when these cranks are turned, all of the screws 62 will be raised or lowered, thus simultaneously raising and lowering the guide rails 61. Rails 61 are connected at theirforward ends by a cross rail 71 which has nuts therein spaced correspondingly to the arms 33 through which extend the screws 72 having hand wheels 73 at their outer ends and rovided with work carrying centers 74 at t eir inner ends. A locking nut 75 havino' a pro-` jecting handle is disposed at the f'iont of each of said screws. A movable cross rail 76 extends between the guide rails 61 being arranged for sliding movement on the latter and said rail is moved forwardly and rearwardly by being equipped with nuts 77 at each end through which extend the screws 78 journaled in

suitable brackets

79 and 80 at the front and rear ends of rails 61. The screws 78 have beveled gears 81 secured to the rear ends meshing with beveled gears 82 secured to the opposite ends of shaft 83 which is journaled in brackets 84 carried on the rear ends of screws 78. The screws 78 at their forward ends are adapted to receive a crank l 85 whereby when one of them is turned, the

other will be correspondingly turned, so that rail 76 will be moved forwardly vor rearwardly.

The rail 76 has shafts 86 j ournaled therein, having centers 86a and work carryin chucks 866 at their forward ends. The s afts 86 have secured thereto gears 87 adapted to be simultaneously rotate by the worm gears 88, some of which are secured to a shaft 89 and some of which are secured to a shaft 90. Said shafts are adapted to be driven by beveled gears 91 and 92, the former of which is secured to shafts 90 and the latter of which is journaled on said shaft and in the side of a box 93. Said gears 91 and 92 are engaged by a beveled gear 94 which also has a spur gear 94a thereon with which meshes a pinion 95 keyed to slide on a splined shaft 96 extending forwardly and. rearwardly of the machine and journaled in brackets 97 carried on the cross member 22 and rail 71 respectively. The rod 96 is kept from longitudinal movement by the collars 96a pinned thereto and Legacy:

fork 100 slidable on a splined shaft 101 which also extends forwardly and rearwardly of the machine, being journaled in brackets 102 on

members

22 and 71 respectively, said shaft 101 projecting'at the front of the rail 71 and being equipped with an operating handle,103. The shaft 101 is held from longitudinal movement; by collars 101e pinned thereto and disposed at each side of the bearing 102. The

sleeve 99 is also slidable over a cylindrical block 104 keyed to shaft 90. The block 104 has grooves in its periphery adapted to receive the keys 99?) when sleeve 99 1s moved to the right as shown in Fig. 4, it being understood vthat the keys 995 terminate short of the end of the block 104 so that said block is not connected to sleeve 99 in the position shown in Fig. 4. A clutch member 105 is pinned tothe shaft 89 and has teeth or keys 105a at its outer end over which engage splined grooves in one end ofthe sleeve 99, wherebv sleeve 99 is connected to member 105. With the parts in the position shown in Fig. 4 gear 94 is driven through

gears

94a and 96 and gear 94 drives gears 91 and 92 in opposite directions. Gear 92 is connected lto member 105 through the sleeve 99 so that shaft 89 revolves with gear 92 and it thus revolves in the opposite direction to shaft 90. If the clutch fork 100 be operated, it moves sleeve 99 to the righi., so that the teeth 9919 move out o f engagement with gear 92 and into engagement with block 104. Sleeve 99 is still connected to the member 105 so that shaft 89 will now be driven by block 104 instead ofgear 92 and shaft 89 will revolve in the sne direction as shaft 90, gear 92 running 1 e.

In Figs. 10 and 11 a modified form of the machine is shown, in which arms 110 are oscillatably mounted on brackets 31 secured to the shaft 30 by the screws lll-'passing through the top and bottom of the arm 110. The arm 110 has a flat rear surface to which is bolted a motor 112 having its driving shaft extending downwardly and carrying a flanged pulley 113. The bracket 110 has guideways on its under surface in which slides a plate 114vhavi'1g a depending stud 115 on which is journaled a pulley 116 having a flange at -its lower edge. The plate 114 has a depending lug 114a to which is secured a rod 117 extending through a depending lug llOa, said rod having a head at its outer end engaged by compression coil spring 118 surroundin said rod and bearing at its other end agalnst lug 110a. Sring 118 thus tends to move rod 117 and pu ey 116 rearwardly.

v rails 76 and 71, which table extends therebe- A bar 119 extends across the front of the ma-i chine havin yoke portions through which' extend theA rontV ends of the arms 110, said yoke portions having screws 120 at their tops and bottoms extending into conical recesses in the top and bottom of arm 110, whereby bar 119 is pivotally connected to said arms.

tween.

In operation of the device shown in Figs. 1 to 9, a pattern will be disposed on the work table 106 beneath the tool carried in central arm 33 and blank pieces of material will be disposed and held on the work table under the tools of the other arms. The motors '43 will be driven and the various tools except the master tool on the central arm 33 will be driven through the belts 53. The operator can move' the master tool over the pattern and the other tools are similarly movedand cut out a similar pattern from the blank material. It will be seen that all of the tools can be moved forwardly and rearwardly asthey are all carried on shaft 30 which is carried by the rollers 23. The motors act as counterweights for the arms 33 and the shaft 30 can be moved forwardly and rearwardly with very light pressure or little force. 1t

will be seen that the tools can all be'moved vertically simultaneously as they are connected by

members

39 and 41 and swung with shaft 30 about its longitudinal axis, said shaft moving on the bearings on which it is supported. The arms 33 can be swung laterally about the axes of screws 32 and they will all move in unison since they are connected by

members

39 and 41. The tools 12 can thus be given-a universal movement and the desired pattern can be quickly carved.

If round work is to be made such as legs for tables or column work, the work will ybe supported on the Work centers 74 and 87. The pattern willr be supported on the centers of the central arm and a master tool can lbe moved over the pattern, the work on the other centers being turned as desired by turning crank handle 98. The

rails

76 and 71 can be readily moved toward and from each other to accommodate work of various lengths by manipulation of the crank 85. The centers, or the work table, whichever are used, can be brought to the proper elevation by manipulation of crank 70. If patterns are to be similar, then all of the arms 33 will be moved in the same direction simultaneously.

of the machine, so that half of the tools will i cut left hand patterns andhalf will cut right hand patterns. When right and left hand patterns are being cut on round work using the centers 74 and 86a, the shaft 101 will be operated by its handle 103 to vmove the clutch sleeve 99 to the position shown in Fig. 4. This will rotate

shafts

89 and 90 in opposite directions, so that shafts 86 at vone side of the machine will be moved in a direction op= posite to those at the other side 'of the machine. v l

From the above idescription it is seen that applicant has provided a much improved carving machine and one that is of simple and efficient structure and can be easily and accurately operated. The member 30 is very easily movedforwardly and rearward and the arms 33 swing very freely about the axis of member 30, as well as about the axes of the screws 32. The structure is such that parts of the machine are nicely balanced and capable of being constructed so that the machine is very durable. The machine has been amply demonstrated in actual practice and 1s being commercially made. Commercial machinesA of thistype generally employ a large number of spindles, seldom less than twelve, and often as many as twenty-four. The trussing of the arm supporting member 30, therefore, becomes absolutely an essential factor to the successful operation of such a multiple carving machine. The said member 30 extends transversely of Athe'machine for the entire length of the machine and is mounted with freedom for oscillating motion in the vertical plane. This said member 30 supports all the arms 33, one of which carries the tracer, and all the others of which carry carving tools. The said arms 33 are all mounted on said member 30 with freedom for swinging motion in a plane at right angles to the plane ofthe oscillating motion of said member 30. The primary purpose ofthe said member `30 is to carry the said arms 33, but the said arms 33 also carry the electric motors 43 and the drives for the spindles operated by said electric motors. All of these parts must be strong in order to stand up to the needed service, and, for that reason practically all of them are made of steel except said arms which are made of lighter material. In view of the foregoing facts it 1s obvious that the load on the arm supporter or member 30, as shown in the drawings, is very heavy. It further follows that, in multiple spindle machines, the load on the arm supporter will be so great that it will sag, and thereby render the machine inoperative, for the controlling reason that the spindles all rise and fall in unison and swing laterally in unison with the arms 33, and hence, the

10 30, as described, the member 30 becomes reinforced in such a way that any 'sagging thereof will not occur, even from the largest number of spindles and arms and motors that are used in the largest commercial machines.

Attention' is called to the fact that while in the structures shown in Figs. 1, 6 and 7 of the drawings, the tool spindles are carried directly at the ends of the arms 33,. in the Y modification shown in Figs. l0 and 11 of the drawings, the tool spindles are carried in a bar 119 which is pivoted to the front end of the arm 110.

It will, of course, be understood that various changes may be made in the form, details, arrangement and proportions of the parts without departing from the scope of applicants invention, which generally stated, consists in a device capable of carrying out the objects above set forth, and in the parts and combinations of parts disclosed and defined in the appended claims.

What is claimed is:

1. A carving machine having in combination, a frame, a member extending transversel;r of said frame oscillatable about its longitudinal axis and freely movable forwardly and rearwardly of said frame, a plurality of arms pivotally mounted on said member about axes extending at right angles thereto, motors carried by said member, a conduit lextending longitudinally of said member about the same for carrying conductors for said motors, brackets secured to said member adjacent its ends and upstanding therefrom, to which said conduit is secured, intermediate hangers connecting said member and said conduit, said conduit being of bowed form so as to be a greater distance from said member at its center than at its ends and forming a truss for said member.

2. A carving machine having in combination, a frame, a member extending transversely of said frame, oscillatable about its longitudinal axis 'and freely movable forwardly and rearwardly of said frame in a horizontal plane, a pair of arms carried by said member and spaced longitudinally thereof, said arms being pivoted about axes disposed adjacent to and extending at right angles to the longitudinal axis of said member, spindles in the forward ends of said arms, a pulley on each of said spindles, a bracket disposedbetween said arms carried by said member and pivoted about an axis disposed adjacent to and extending at right angles to the longitudinal axis of said member, said bracket extending to the rear of said member and having a motor bolted thereto forming a counter-balance for said arms, said bracket extending forward from said member a much shorter distance than said arms and having a pulley secured thereto at its forward end, a pulley carried by said motor and a belt running over said four pulleys.

3. A carving machine having in combination, a frame, a plurality of spaced movable work supporting centers carried thereby,

ears connected to said centers, gears meshing with said gears respectively, a shaft to which some of said last mentioned gears are secured, a second shaft to which the other of said last mentioned gears are secured, said shafts extending at right angles to the axes of said centers, a pair of oppositely facing beveled gears on one of said shafts, one of said gears being secured to said shaft and the other being journaled on said shaft, a beveled gear meshing with both of said beveled gears, means for turning said last mentioned beveled gear, means for connecting said journaled beveled gear to the second shaft above mentioned and means for connecting said shafts whereby all of the centers may be rotated in one direction or some may be rotated in the opposite direction to the others.

4. In an engraving machine, the combination, with a support, for the material to be carved, of fixed guide rails spaced apart from each other transversely of the machine, a tool carriage having supporting wheels which traverse said rails and are loosely journaled on said carriage, band wrapping and aligning rollers on said carriage of substantially the same diameter as said wheels, mounted to rotate independently of said wheels, pairs of bands having their inner ends secured to the peripheries of said rollers side by side parallel with each other, and having their respective outer ends anchored to relatively fixed parts of the machine at points on the opposite sides of said rollers, and a tracer carrying arm and a plurality of tool carrying arms all mounted on said carriage with freedom for common oscillating motions in two different planes at right angles to each other.

5. In an engraving machine, the combination with a support, for the material to be carved, of fixed guide rails spaced apart from each other transversely of the machine, a tool carriage having supporting wheels which traverse said rails and are loosely journaled on said carriage, band wrapping and aligning rollers, on said carriage, mounted to rotate independently of said wheels, pairs of bands having 'heir inner ends secured to the peripheries of said rollers side by side parallel with each other, and having their respective outer ends anchored to relatively xed parts of the machine at points on the opposlte sides of said rollers, by anchorage means at least one of which includes a spring acting to tension the bands and prevent breakage thereof, and a tracer carrying arm and a plurality of tool carrying arms all mounted on said carriage with freedom for common oscillating motions in two different planes at right angles to each other.

6. A carving machine having in combination, a frame, a 'transverse member freely movable forwardly and backwardly of said frame, forwardly extended arms carried by said transverse member and pivotally connected thereto about axes at right angles to the axis of said member, a rigid cross bar spaced from said transverse member and pivotally connected to all of said arms and compelling the same to move in unison, pulleyequipped tool spindles held, in proper working positions, by said arms and said cross bar, electric motors carried by said transverse member, one for each pair of tool spindles which motors have each a pulley on its rotary element, adjustable guide pulleys also carried by said transverse member, one for each pair of tool spindles and corresponding single belts extending each from one of said motor pulleys to one of said spindle pulleys of the pair and thence to said adjustable guide pulley, thence, to the other spindle pulley of the pair, and thence back to the motor pulley.

7. A carving machine having in combination, a frame, a transverse member freely' movable forwardly and backwardly of said frame, forwardly extended arms carried by said transverse member and pivotally connected thereto about axes at right angles to the axis of said member, a rigid cross bar pivotally connected to all of said arms and compelling the same to move in unison, pulleyequipped tool spindles supported, in proper working positions, by said arms and said cross bar, electric motors carried by said transverse member, one for each pair of tool spindles which motors have each a pulley on its rotary element, automatically adjustable guide pulleys also carried by said transverse* member, one between each pair of tool spindles and corresponding single belts extending each from one of said motor pulleys-to one of said spindle pulleys of the pair and thence rearwardly to said adjustable guide pulley, thence to the other spindle pullev of the pair and thence back to the motor pulley.

8. A carving machine, having in combination, a frame, a member extending transversely of the frame and oscillatable in the vertical plane, on its longitudinal axis. and freely movable forwardly and rearwardly of said frame. forwardly extending arms carried by said transverse member and pivotally connected thereto about axes extending at right angles to the axis of said member,

nected thereto about axes at right anglesjto l the axis of said transverse member, electric motors located one on the rear end-of each of said brackets, each of which motors has a pulley onA its rotary element, adjustable guide pulleys on each of said brackets and a corresponding series of single belts extending one from each of said motor pulleys to the pulleys of two adjacent tool spindles and hence about said adjustable guide pulley.

9. A carving machine, having in combination, a frame, a member extending transversely of the frame, oscillatable on its longitudinal axis, in the vertical plane, and freely movable forwardly and rearwardly of said frame, forwardly extending arms carried by said transverse member and pivotally connected thereto about axes extending at right angles to the axis of said member, a rigid cross bar pivotally connected to said arms and compelling the same to move in unison, pulley-equipped tool spindles supported in proper working positions by said arms and said cross bar, motor supporting brackets, one for each pair of said tool spindles, carried by said transverse member and pivotally connected thereto about axes at right angles to its axis, links, one for each of said brackets, connecting the same to -one of said arms, electric motors, one on the rear end of each of said brackets, each motor having a pulley on its rotary element, adjustable guide pulleys on each of said brackets, and a corresponding series of single belts extending 'one from each of said motor pulleys to the pulleys of two adjacent tool spindles and thence about said adjustable guide pulley.

10. In a carving machine, the combination with a supporting frame, of a carriage manually movable forwardly and backward- 1y on said frame, above the material to be carved, a transverse member journaled on said carriage with freedom for oscillation on its longitudinal axis, in the vertical plane, forwardly extending arms carried by said transverse member and pivotally connected thereto about axes extending at right angles to the axisof said member, a rigid cross bar pivotally connected to said arms and compelling the same to move in unison, pulley- `equipped tool spindles supported, in proper working positions, by said arms and said cross bar, motor supporting brackets, one foreach pair of said tool spindles, carried by said transverse member and pivotally connected thereto about axes at right angles to the axis of said member, intermediate the opposite ends of said brackets, electric motors,'one on the rear end of each of said brackets having each a pulley on its rotary element, links, one for each of said brackets connecting the same to one of said arms, automatically adjustable guide pulleys on the forward ends of said brackets and a corresponding series of single belts extending one from each of said motor pulleys to the pulleys of two adjacent tool spindles and thence about said automatically adjustable guide pulleys, substantially as described.

1l. In a carving machine, the combination with a supporting frame, of a tool carriage manually movable forwardly and backwardly on said frame, above the materialto be carved, which carriage includes an elongated transverse member oscillatable on its longitudinal axis, in the vertical plane, a plurality of forwardly extended arms carried by said transverse member and pivota'lly connected thereto about axes extending at right angles to the axis of said member, a rigid cross bar pivotally connected to all of said arms, near the forward ends of the same, and compelling said arms to move in unison, tools supported, in proper working position, by said arms and cross bar, counter-balancing elements vcarried by said transverse member, at the rear of its longitudinal axis, serving to counter-balance said arms and the parts carried thereby, and a re-inforcing truss applied to said transverse member comprising a rigid metallic compression member of substantially the same length as said transverse member disposed above and in the same vertical plane as the axis of said transverse member, but tressing brackets secured one to each of the opposite ends of said transverse member and seating the ends of said compression member and a series of hangers connecting the intermediate portions of said compression member with the intermediate portions of said transversc member, which truss prevents the sagging of said transverse member under the load of the parts carried thereby.

12. In a carving machine, the combination with a supporting frame, of a tool carriage manually movable forwardly and backwardly on said frame, above the material to be carved, which carriage includes an elongated transverse member oscillatable on its longitudinal axis, in the vertical plane, a plurality of forwardly extended arms carried by said transverse member and ivotally connected thereto about axes exten ing at right angles to the axis thereof, a rigid cross bar pivotally connected to all of said arms, near the forward ends of the same, and compelling said arms to move in unison, tools supported, in proper working positions, by said arms and cross bar, motors carried by said transn verse member, at the rear of its longitudinal axis, serving to drive said tools and to counter-balance said arms and the parts carried thereby, and an adjustable reinforcing truss applied to said transverse member comprising a rigid metallic bowed compression member of substantially the same length as said transverse member and disposed above and in the same vertical plane as the axis of said transverse member, buttressing brackets secured, one to each of the opposite ends of said transverse member, and seating the ends of said compression member and a series of adjustable hangers connecting the intermediate portions of said compression mem ber with the intermediate portions of said transverse member, which truss prevents the sagtginfg of said transverse member under the loa o the parts carried thereby.

In testimony whereof I atlix my signature.

GUSTAVE A. PARTEN.