US1683368A - Machine for rolling wheel disks - Google Patents

Description

Sept. 4, 1928.

E. A. NELSON MACHINE FOR ROLLING WHEEL DISKS Filed April 9,

- 6 Sheets-Sheet 1 I N VEN TOR.

EMIL- A. NELSON By WW ATTORNEY.

Sept. 4, 1928.

E. A. NELSON MACHINE FOR ROLLING WHEEL DISKS Filed April 9, 1925 6 Sheets-Sheet 2 INVENTOR sum. A. NELSON ATTORNEY.

Sept, 4, 1928. 1,683,368

. E. A. NELSON MACHINE FOR ROLLING WHEEL DISKS 'Filed April 9, 1925 6 Sheets-Sheet 3 INVENTORI EMIL. A. NELSON FIG-Z- BYWQJVL A TTORNEY.

Sept. 4, 1928 11,83,368

E. A. NELSON MACHINE FOR ROLLING WHEEL DISKS Filed April 9, 1,925 e Sheets-Sheh 4 INVENTOR.

ATTORNEY.

Sept. 4, 1928.

E; A. NELSON MACHINE FOR ROLLING WHEEL DISKS Filed A ril 9, 1925 6 Sheets-Sheet 5 INVENTOR.

" EMBL, A. NELSON A TTORNE Y.

E. A. NELSON MACHINE FOR ROLLING WHEEL DISKS Sept. 4, 1928.

Filed April9, 192 5 6 Sheets-Sheet 6 IN VEN TOR. Emu A. NELSON ATTORNEY.

Patented Sept. 4, 1928.

UNITED STATES masses PATENT OFFICE.

.EMIL A. NELSON, OF ABINGTON, PENNSYLVANIA, ASSIGNOR TO BUDD WHEEL COM- PANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

MACHINE FOR ROLLING WHEEL DISKS.

Application filed April 9, 1925. Serial No. 21,797.

My invention relates to machines for rolling tapered wheel disks, especially to that class of machines developed very recently,

and the subject of an application for Lettersv The prime object of my invention is the de-' velopment of an improved type of this class of machines.

In general, the machines of this class which have heretofore been built have comprised a rotating blank holder in the form of a platen having a cross section corresponding in taper of working surface to the taper it is desired to give the related disk. A pair of diametrically other than straight lines and in a multiple.

number of angular directions, arrangements opposed traversing rolls having a rectilinear traverse radially outward on a blank engaging'line in converging relation to the radial tapered surface of the platen engage a'blank upon the platen during the outward traversing movement in a combined spinning and rolling action. The-work is thereby done on the blank along a spiral path progressing outwardly from the central area of the worked blank.

The types of machines heretofore developed have embodied constructional arrangements inherently weak, and affecting the application of the working pressures along lines which at once invite 'lost motion, weaving,

, misalignment, undue wear of Working parts,

etc. These types have moreover been relatively diflicult to adjust, equally diificult to retain in adjustment, diflicult to repair, and operated at a relatively low speed of production;

As aforesaid, the prime object-of my inven- -tion is to achieve an especially practical type of machine, one in 'which inherent simplicity of parts and straight-forward constructional combinations are utilized in a manner to enable those skilled in the art to practice. good engineering design and to eflectually eliminate in such designs most if not all of the working troubles heretofore experienced. From another angle it is my object to produce a type of machine at once strong, sturdy and reliable, amachine Which will stand up for a long period of time under the extremely heavy duty in which it operates.

To produce such a type of machine having a general accessibility of parts and at the same time easy to knock down and assemble is another object. There results not only a facility in repair, but facility in manufacture and shipmentof this large and heavy machine.

To produce a type of machine economical in power under this heavy duty is likewise an object.

An object, too, is the production of a machine whichcan be used to make tapered disks of either hot or cold blanks.

And an important object is the production of a type of machine having a decidedly increased rate of production, one sufliciently high to decidedly improve commercial economy of operation.

In the attainment of these objects I have invented a machine characterized among other things by the application of the approach and separation mechanism through which the approach and separation of the blank support and the Working roll are effected, to the blank support rather than to the roll support or roll-carrying head, as has been commonly-done heretofore. This in itself greatly increases the rate of production of the machine, since the roll-carrying head, the associated working rolls, and the traversing mechanism and its prime mover constitute a very heavy mass which prevents by its inertia the attainment of high speed production. I am moreover able to reduce the complexity of these portions of the machine by removlng from association with them the approach and separation mechanism, and thereby to'eflect a great deal of the simplicity and straightforward construction which is my aim. Un-

burdened by these parts the roll-carryinghead may be made more rugged.

My invent-ion is characterized further by a concentration of the working strains on straight lines grouped as nearly as possible to the blank support itself, giving force reactions on straight lines substantially parallel -to'the .axis of rotation of the blank support.

The approach and separation mechanism is in the form of toggles symmetrically disposed with respect to the axis of the blank support, and derives its power directly fromthe traversing mechanism of the working rolls. Thus the common prime mover supplies power for both the traversing and the approach and separation movements.

-n1ounted on a sub base anchored to the main base. The sub base is flanked by the approach and separation mechanism and the approach and separation mechanism is in turn flanked by a series of columns anchored to the main base of the machine and extending well beyond the blank support where they carry the roll carrying head in relatively fixed position as respects the base of the machine. Through this very arrangement I am able not only' to 'yieldingly mount the head, but to effectually adjust it. t

The head is a very deep structure having a hollow interior and a flooring on the side adjoining the blank I support. The working i rolls are mounted upon it for traversing movement between the flooring and the blank support. The prime mover for the working rolls is carried within the hollow of the head and geared directly to the working rolls beneath.

Finally, the type of the machine is characterized in general by symmetry of parts and by unit constructions as applied to its several mechanisms.

Of the drawings,

i Fig. '1 and Fig. 1 depict the machine in side elevation, Fig. '1 being partially a view n central longitudinal section while Fig. 1 1s the opposite half ofthe machine in full elevation.

Fig. 2 is an end elevation of the machine showing one-half of the machine in full ele vation and the other half in transverse sec: tional elevation.

Fig. 3 is a central vertical longitudinal section of the machine with portions of the top and bottom broken away and designed to show 1n longitudinal section the work feedlng mechanism.

F 1g. 4 is a plan view taken in a horizontal plane just above the rotati-ngblank support and the work feeding mechanism as shown in Fig. 3.

.. Fig. 5 is a vertical longitudinal section of I supported from it, and through which the working rolls R and R are driven, in general by the letter T, while the feeding mechanism is designated generally by the letter F. p

The blank support B is carried rotatably at the upper ends of a sub base 10, anchored by bolts 11 in the extended heavy and rigid main base M. It is rotated by a prime mover 12 anchored to the main base M to one side of the machine. This prime mover 12 has a horizontally-extending drive shaft 13 connected by detachable coupling 14 with the horizontal drive shaft 15, journaled in the sub base 10. Drive shaft 15, through beveled gears 16, 17, drives a vertical shaft 18 to which the blank support B is connected for rotation, through the intermediary of several elements presently to be described.

The approach and separation mechanism A flanks the sub base 10 and comprises four toggles designated generally G. These toggles are arranged in pairs on opposite sides of the base and each pair lies in a longitudinal vertical plane which intersects the perimeter of the blank holder B, as clearly appears in Fig. 2. In fact the toggles actually underlie the-area of the blank support B and exert their pressures on a straight line passing through this area, and in direct opposition to the working rolls traversing the face of the blank support; Associated with these toggles are dogs 19 and 20 engaging with coacting dogs 21 mounted upon roll-carrying frames 22, by means of which rolls R and R are supported from the head H. Through interengagement with these dogs, the approach and I separation mechanism is directly operated through the traversing movement of the rolls. As appears in Fig. 2, these dogsare located 1n the same longitudinal, vertical plane as the toggles themselves, and this plane intersects the bodies of the frames 22 by means of which traversing rolls are supported. When the traversing rolls-are moved, the engagement of dogs 21 at the outer extreme of movement unlocks the toggles and causes a quick movement of separation. When dogs 21 enga'ge dogs 19 upon the inner traversing movement, the toggles are gradually raised to their locked positions in which the extreme of approach of the blank support B to the rolls R R is established.

; Toggles G comprise in each case a lower in anti-friction bearings transversely of the foot of the sub base of the machine. Lubricant is supplied these bearings 25 by forcing through conduit 26 provided in the body of the shaft; Corresponding pairs of toggles on the same side of the machine, however, are, as shown clearly in Fig. 1 and Fig. 2, geared together by segmental gears 27 bolted tb arms 23 surrounding shafts 24': The arrangement is such that the arms 23, and consequently the toggles G at large, operate in unison toward and from the central vertical transverse plane through the axis of the machine. The upper arms 24 of toggles G connect with the cradle structure 28 bearing the blank support B, and through which structure the toggles move the blank support B to effect its approach and separation movement with respect to the rolls R and R Connection is made, respectively,

with the lower arms 23 and with this cradle 28 by means of heavy bearing pins 29 passe'd through the forked projections 30 and 31, re-' spectively,and the intervened upper arm itself. Lubrication is supplied to the generous bearing surfaces through channel 32 provided in the pins. The pinsare retained in place by means of retaining bolts 33, or any equivalent device.

An extension 34 is formed integrally with the lower arm 23. This extension projects first laterally to clear the vertical projection of the blank support B (Fig. 1 then substantially vertically upward. past the blank support B. It is here provided with an inwardly extending upper end 35. This upper end is in the form of a horizontally extending arm projecting inwardly of the ma chine. It is removably secured" by bolts 36 in the socket 37 in the upper end 0 extension The cradle 28 is journaled within the body of the sub base 10 on substantially cylindrical bearings 39 (Flg. 1 Such bearings are very easily formed by boring or turning, and

p can be fitted with great accuracy. It is the lower portion of the cradle which is .borne in these extended bearings. The upper portion is provided, as shown in Fig. 1 andin the plan View shown in Fig. 4, with a rectangular exterior, the opposite ends of which are borne between plane bearings 40in the upper por tion of the sub base. Cradle 28 is supported against rotation by these bearings 40, yet it may move freely in an axial direction. Supported both in these hearings and in the cylindrical main bearings39, it isso moved axially when the toggles G are made and broken.

This cradle 28 supports the blank holder B jointly by means of the anti-friction thrust bearing 41 of relatively large diameter,

and the radial anti-friction bearing 42 of relatively small diameter. The raceways of these hearings associated with the blank support B are borne by a blank support hub member 43 to which the blank support B is removably bolted, as at 44. The blank support is provided with the usual removable facing 45. Blank centering pin 46, adapted to pass through an aperture in the blank to center the same, passes freely through this facing 45 and is screwed home against a shoulder 47 formed in the center of the blank support'B.

The hub 43 is free to rotate within the cradle 28 so that its rotation exerts no more than the torque imposed by the anti-friction bearings in a" tendency to rotate the cradle. Interiorly it isbored out to receive the splined sleeve 48 through which it is keyed to the driving shaft 18 from which power is supplied to the rotatingplaten. This sleeve 48 fits snugly within the central bore of the hub member 43, and onv its lower end is provided with a shoulder 49 between which and the hub is confined the inner raceway of the anti-friction bearing 42. Its upper end is screw threaded and receives the clamping ring 50 by means of which the anti-friction bearing 42 and hub 43 are clamped firmly upon it. lnteriorly' it is provided with the spline 51 This spline receives key 52 which is removably secured to the hollow drive shaft 18. Thus the rotating blank support is efiectually. coupled to its drive shaft, yet its cradle does not rotate but is free to partake of the approach and separation movement without disturbing the coupled relation, the key 52 sliding freely in the keyway 51., At the same time the cradle supports it anti-frictionally both against the tremendous working thrust through the anti-fric tion. bearings 41 of large diameter, and against radial thrust throughthe' anti-friction bearings 42. L

The hollow driving shaft 18 is extended downwardlybelow gear 17 and there provided with a triple series of anti-friction radial thrust bearings 53, 54 and 55, the raceways of which are mounted in a verticallyextended sleeve or bearing casing 56 bolted or otherwise secured to the body'of the sub base 10. The bearings are provided with suitable spacers, the one 53 being located atv the top just beneath the gear 17, and two of r of the machine.

them being located at thebottom, the bottom most seated upon shoulder 57' of the subbase 10. The entire series is removable simply by removing the mounting casing 56.

The horizontally-extending drive shaft 15 is likewise supported by anti-friction bearings at its inward and outward ends, these bearings being designated 57 and 58, respectively. These bearings are carried in a I construction just described is lubricated by a system of conduits formedin the parts commencing with the bottom of the sub base 10. This bottom is provided with a central chamber 61 immediately underlying the lower ends of the hollow shaft 18. Its lower end is closed by a removable flanged plate 62. Oil is introduced to the chamber from a circulating pump 63 by a conduit 64 entering the center of the flanged plate 62-. This central entrance is through a projecting nozzle 65 formed integrally with the flanged plate 62. Interconnccting the nozzle and the hollow interior of shaft 18 is a section of tubing 66 having an oil-packed joint 67 with the lower end of shaft 18. Lubricant thus passes through the hollow 68 of the shaft to the top where it emerges within the recess 69 in the under side of the blank support B: Thence, it passes downwardly through and over the various bearings and guideways just described. It lubricates the spline connection 51, 52, passes down through the dotted line channel 70 to the thrust and radial bearings 41 and 42 entering the recess 71 below the cradle 28. There it lubricates the mounting bearings 39 and 40 of the cradle itself, working up' slightly through the recess 72 to the bearing 40. Passing in bulk downwardly, it lubricates gears 16 and 17, the series of radial bearings 53, 54, 55, the series of horizontal bearings 57, 58, and, finally, passes through spaces 73 and channel 74 into the hollow chamber 61 through which it originally entered by way of'tubing 66. Chamber 61 .is of sufficient dimension to act as a sump if desired. However, another and larger reservoir may be provlded for this purpose.

Chamber 61 surrounding tubing 66 is provided with strainer 75 through which the lubricant passes from thebody of the chamber to the suction conduit (not shown) through which it returns to the circulating pump 63.

The columns C are arranged in pairs symmetrical with respect to-the vertical center chored' in a manner (not shown) rigidly A machine.

Their lower ends are an in the extended rigid and heavy main base M. They are spaced from the blank supporting structure B and the approach and separation mechanism A sufliciently to allow free play of the parts of the latter mechanism in the space between the supporting structure E and the columns; Their extended upper ends support the roll-carrying head H approximately at its four corners. Within the columns on its under side, the roll-carrying head H is provided with the undercut guidew'ays 77 overlying the approach and separation mechanisms A, and mounting and guiding in their traversing movements the frames 22 supporting the traversing rolls R, B. These guideways 77 in general are located in substantially the same vertical plane as the approach and separation mechanisms A. The line designating this plane in Fig. 2 is marked 78, and these planes are parallel to the longitudinal plane of symmetry of the By virtue of these constructions, planes 78 are drawn close in to the longitudi; nal plane of symmetry, so close that they substantially intersect the working zone of the blank support B and the supporting cradle 28, and make feasible not only that direct mechanism interconnection between the approach and separation mechanisms A and the traversing frames 22 of the working rolls, but the application of supporting the working pressures along essentially straight lines, and the application of the force of reaction in direct opposition to the forces of working, Yet by reason also of the constructions' recited, the actual working movements and the generous supporting bearings of the blank support B are in no wise impaired.

The tops of the columns are interconnected in longitudinally-extending pairs by bridges 79 in the form of heavy I-beams, as appears in Fig. 2. The columns pass upwardly freely through the ends of these bridges, and their upper ends are threaded. Split nuts 80 on these threaded ends are arranged to adjust the bridges 79 up and down within the limits of the threaded column ends. Having been adjusted, the nuts may be clamped in position by clamping bolts 81, through which its parts are firmly drawn together and about the ends of "the column. Between the bridges 79 and the roll-carrying head H are arranged a series of heavy spiral springs 82 borne in sockets formed, respectively, on the under side of the bridge and the upper side of the roll head. These springs collectively exert sufficient pressure to bear the roll head H upon the work with the de-. signed working pressures-of spinnin and rolling. The tension of these springs 1s adjusted to a determinate value such that normally the rolls R and R perform their work without give of the roll head H, but if the normal working pressures are exceeded,

' the rolls with the work at the close of the approach movement of the blank support B and the roll, but only momentarily. It may be exceeded, too, should the rolls accidently, due to any misalignment of parts or overtraverse of the rolls in case of the use of blank support B of 'extra large diameter, come within working contact, not with an intervened blank, but with the hardened face of the blank support itself. The springs 82 would function also-in case the rolls should encounter any abnormally hard mass in the blank being rolled, or any foreign substance between the blank and themselves. In other words they function as a safety device preventing the building up of destructive forces or they may be so set, if desired, as to cushion the rolling operation to as greataextent as may be desired under any given working conditions.

. adjustment of which the Also mounted on the columns C, but in this case below the roll-carrying head H, are a second group of adjusting nuts 83, likewise threaded on the columns, and likewise. clamped in adjusted positions, in this case by clamping bolts 84. These nuts constitute limit stops beneath the roll-carrying head H by the imit of proximity of the working faces of rolls R and R to the working face of the blank support B may be set. By such setting, the thickness of the forged blank is adjusted. Normally these limit stops 83 support'the weight of the roll head H and'its pertinent mechanisms, and also counteract the normal pressure of springs 82 Or equivalent means by means of which the rolls R and R? are held to the work. Furthermore, by relative individual adjustment'they coact with the bodies of the columns upon which .the roll-carrying head is aligned, to adjust the alignment of the through their firm anchorage. in. the main roll-carrying head.

The roll-carrying head itself isa heavy and deep casting of substantial rectangular horizontal cross section. .In each of its four corners it is provided with extended bearings 85 through which the columns C project, and by means of which the roll-carrying head H is accurately borne and guided upon the columns in its adjustments. The columns,

base M, and their generous cross section, are themselves rigid and possess considerable re sistance to bending and weaving movements.

An accurate fitting of bearings 85, and the amassing of the metal 86 of the casting about the bearings, serves to further increase this resistance to bending and weaving. The under, faces 87 surrounding the bearings are accurately machined, and. the top faces of nuts 83 complementally machined whereby these effects are abetted and the horizontal'ity of the roll-carrying headmay be adjusted with great nicety. Side walls are formed as 1 box beams, as clearly appears in Fig. 2, while end wall-s are formed as channel beams, as clearly appears in Fig. 1

The main bodyof roll-carrying head H is hollow and open at'the top, springs 82 bearing against the flanged tops of its side walls. The bottom of the head, however, is provided with a flooring 88. On this flooring as a foundation within the hollow of the head is mounted a prime inover 89 with a substantially horizontal driving shaft 90 for supply:

ing power for the traversing movement of the rolls R and R 'On this under side of this flooring 88 are formed the'undercut guideways 77 for the roll-carrying frames 22 of the working rolls. These guideways 77- are formed symmetrically with respect to the longitudinal plane of symmetry, and the shaft 90 of the driving motor lies in this plane of symmetry, as shown in Fig. 2.

There are two of the roll-carrying frames 22, one lying oneach side of the transverse axis of symmetry of the machine, as appears in Figs. 1 and 13. Each of them comprises a main body 22 mounted in the guideways 77 to slide laterally in traversing movement. They are provided with depending roll axis supports or bearings 91 and 92. These bearings jointly support a large journal shaft 93 having a fixed relation both to the roll frame 22 and the rolls themselves. The rolls are journaled on shaft 93 between the bearings 91 and 92. Between the bearings the shaft is surrounded by an adapter sleeve 94 upon which the inner raceways of the anti-friction bearings 95 and 96 bear.- the rolls B R is hollowed out and the inner surface itself constitutes the outer raceways of these anti-friction bearings. One of them is provided within the hollow of the rolls at each end whereby they have a-well distributed support uponshafts .93. The raceways of the rolls are undercut and separated by a central web 97 whereby the rollers of the anti-friction bearings are retained against lateral displacement. The inner raceways are confined against a lateral displacement by lateral engagement with the adjacent end faces of bearings 91 and 92, and the provision of suitable spacers between them.

The bearing '92 is extremely short, being formed by a plate secured by machine screws 98 to the end faceof the frame 22. Its bear- The interior of ing surface isconstituted by an aperture 99 Y concentric with shaft 93 and fitting over a bearing collar 100 screw threaded on to the of the bearing 92' and the inner raceway of the inner anti-friction bearing 96. The inner raceways of the bearings, and the sleeve 9 1 are retained in place by direct engagement with these collars 100. Lubricant is supplied to the bearings by forcing it into a channel 102 having a mouth in the ends of shaft 93.

The bearing 91 relative to bearing 92 is of extended length, being formed in the relatively thick depending central body of the frame 22. Shaft 93 is keyed in bearing 91 by spline 102 against rotation with the working roll. Just outside the bearing 91 it is provided with a shoulder 103 preventing axial movbment in the bearing 91 during the transverse movements of the roll. Outside of this shoulder the body of the shaft is extended laterally substantially to the outer borders of the machine at'large. Its outer end is of reduced cross section and formedas a screw 104, constituting a part of the traversing mechanism presently to be described. The end 105 of its portion of large cross section is provided with a combined aligning, supporting and packing bearing 106 in the concentric sleeve extension 107 from the traversing mechanism T. Ex cept for the inner bearing 92 which affords a very substantial support indeed, and mayin fact afford any degree of support desired, the shaft 93 is arranged in bearings 91 and 106 as a cantilever, carrying the, working roll at its 4 inner end. I

The traversing mechanism T comprises in the main a gearingconnection between the drive shaft 90 of prime mover 89 and the axis shafts 93 of the working rolls R and R carrying heads H. A unit supporting frame 5 109 for the traversing mechanism is bolted detachably to each end of the head H. In it, at its upper end, are provided bearings 110 for the extended end 108 of shaft 90. Its lower end depends from the extended ends of the head H and is provided with the underhanging sleeved extension 107 previously described as constituting the guideway for the laterally extended end of the roll shaft93. This sleeved extension is braced from the body of the casing 109 by aseries of exterior buttressing Webs 111. Intermediate the extended shafts 108 and 93, the casing carries in the same plane with them a fixed idler shaft 112 mountr ing on journals 113 a .central idler 114.

Through pinion 115,- keyed on drive shaft 108, this idler 114 transmits power to gear 116 operating upon the screw 104 of shaft 93. Gear 116' is provided with an elongated hub 117 interiorly screw threaded upon the screw 104,- the length being made suflicientto wear effectively under the heavy power required to supply.

be transmitted through the screw for the traversing operations. Interiorly, the-hub sleeve 117 is journaled in a sleeve bearing 118 centered in the'sleeve 107. On each side of the body web of gear 116, close to bearing sleeve 118 and hub 117, is provided an antifriction axial thrust bearing 119, the inner and outer raceways of which bear, respectively, against the web of the gear and interior shoulders 120, 121 of the walls'of the casing 109 of the mechanism at large. shoulder 121 is constituted by the end Of a detachable flanged collar 122 coaxial with screw 104, and of an exterior diameter slightly greater than the diameter of the exterior anti-friction thrust bearing 119. fThereby, when the collar 122 is removed, the bearing may be removed. Moreover, shoulder 121 projects interiorly a sufficient extent to admit the disengagement of gear 116 from idler 114 through axial movement outwardly toward the outside of the casing .109, admitting independent rotations and operations of the then separated parts of the mechanism; v

The casing 109 isitself made in inner and outer halves secured together by bolts 123,

upon removing which the halves may be sep- The outside 7 arated and any or all of the gears contained 4 therein removed. The casing 109, when its halves are assembled, however, and in place upon the machine, is oil sealed, whereby upon the placement of a certain amount of lubricant in its interior, all ofthe enclosed parts are continually lubricated from its reservoir The inner end .of sleeve 107 is lubricant sealed by the bearing 106, as has been said, throughout the traversing stroke of shaft 93. The collar 122 opposite is provided centrally with a tubular capped casing 124 which receives the projected outer end of the screw 104 upo-n'its outward traverse, eflectually sealing this side of the casing, yet permitting entire freedom of movement of the screw. Lubricant is borne up from the bottom of the casing by the gear 116 to the gears in series with it. Bearings themselves are 111- bricated mainly by this upwardly borne lubricant. Lubricant passageways 125 past the sleeve and thrust bearings 118, 119 insure proper passage and drainage of lubricant around the hub 117 of gear 116 and screw 104. Throughout the machine the mechanisms are constructed as independently detachable and replaceable units. The traversing mechanism just described can be bodily removed from the. machine merely by removing the securing bolts 126 and removing screw 104 fromthe gear 116. Since the guideways 77 extend throughout the length of the roll head, ,H, the roll supporting frames 22, with the shafts 93, and rolls R and R ,-can be independently removed merely by sliding through the ends of the wa s. Moreover, the relative 'arrangement of t e traversing mechanism,

the roll" head and the blank supporting con- The driving motor 89 can be most easily re" moved and replaced by uncoupling shaft 90 from its extensions 108 and hoisting the motor out of the open top' of the head by crane. The roll head H itself needs rarely to be removed, but in any case when neces-- saryit is removed merely by releasing nuts 80 at the tops of the columns and removing the bridges 79, which may be bodily hoisted off of the columns by an overhead hoist. In

fact, where desired, the entire assemblage of mechanism connected with the roll head 11 may be lifted with it sufiiciently to give the additional access desired, or to be entirely removed from the machine. The columns themselves are located beyond the sides of the blank positioning mechanism 13, as clearly shown in Fig. 2, with-the result that this entire mechanism supported on sub base may, merely by removing the securing means 11 and by removing the upperarms of the approach and separation mechanism which carry the interlockexldogs, be bodily removed. and replaced lengthwise of the machine. B releasing coupling 14, as appears in Fig. 1 it can also be bodily removed transversely of the machine. WVhenever its interior parts are to be worked upon, or when, to gain accessibility to them, it is required that the blank support B be lifted from its bearings, this is of an advantage. It is of even greater advantage in case of needed ovehauling of the machine; since for more change of platen it is possible to traverse the rolls R and R laterally apart sufficiently to enable the platen to be removed. Change in the design of a blank to be operated upon necessitates at times change of the form of the platen, in which some taper is usually provided. This can easily be removed merely by withdrawing-the anchoring bolts 44.

The operation of the various mechanismsof the machine is co-ordinated through both electrical and mechanical means to secure operation upon blanks placed upon the blank holder B according to continuously and automatically repeated cycles. The traversing motor 89 in the roll head H is a motor of the automatically reversing type, the reverse of which is under the control of the traversing movement-of the traversing working rollers R and R This is to say that at the extreme movement of inward traverse, the close of this movement operates appropriate circuit controllers to reverse the motor 89 and effect its rotation in the direction to'cause outward traverse of the rolls R and R At or near the close of the movement of outward traverse, circuit controlling means are ope erated to again reverse the motor, this time to cause its rotation in the original direction,

to again initiate the movement of retraverse toward the center of the machine. The range of this movement is adjusted so that the rolls R and R approach each other very closely near the center of the machine on the retraverse movement, as closely as the relatively thin bearings 92 permit, or so closely without thisminimumlimit as the work desired on the central area of the blank requires. The outward range of the movement has a limit sufficient to enable the working rolls to work over the full diameter of the blank holder B. Electrical circuits and the controlling -devices are not shown herein since they constitute a separate invention.

Receiving'its power through the traversing movements brought about as described, the approach and separation mechanism functions on its inward stroke, brought about by the engagement of dog 19 with dog, 21, to raise the blank support B with the blank which shall have been placed upon it into working engagement with the rolls R and R and to lock the toggles G in the extreme raised position by moving the center bearing 32 of. the toggles slightly past the vertical center line. This condition is reached. preciselyat the time rolls R R reach their extreme inward position of retraverse, and the motor 89 is reversed. The ensuing outward traversing movement constitutes the working stroke, so to speak, of the rolls. In this stroke they are borne hard down upon the blank under the great pressure built up by the toggles G in their final locking movement in which they have forced the blank into contact with the rolls against the heavy pressure of the springs 82 which bear roll-carryinghead H and rolls R and R to the work. Co-ordination between the opening of the traverse movement and the locking of toggles G may be accurately secured by adjusting the dog '19 of the arm 35. As the traversing movement progresses, the blank is spun and rolled by the co-action of the "working rolls R and R of the blank holder B, the rolls R and B being rotated through their engagement with the blank. The blank holder is preferably j exterior to the working rolls R and R begins todish up, and this dishing continues until the traversing movement is concluded, disappearing entirely only when the rolls reach the edge of the blank. At the close of the working engagement, dog 21 engages dog 20 and unlocks toggles G, whereupon the blank support drops away from the working rolls R R At or near this time the motor 89 is reversed to retraverse the. rolls. Dur ing the early stage of retraverse, the worked blank is removed from the blank holder B and a fresh blank is substituted. This is accomplished by a special feeding mechanism coacting with the blank holder in its approach and separation movements.

The feeding mechanism comprises front and back'trackways 126 and 127, respectively, the tracks of which ways are detachably carried by clamping means 128, with the-col umns C (see Figs. 3 to 6).

' substantially parallel and are arranged symmetrically with respect to the transverse plane of symmetry of the machine. Through the detachable. clamping means 128 the rails may be adjusted vertically and also horizontally to assure parallelism. In general, they lie in a horizontal plane perpendicular to the vertical axis of the machine. Trackways contain interior grooves 129 within which are mounted on the front of the ma chine the feeding-in mechanis1n'130, and on the back of'the machine the removing mecha- 'nism 131. The feeding-in mechanism 130 comprises a tubular framework 132 of sub stantially rectangular form, and of less width than the distance between the rails of the track 126. The corner fixtures 133 of this frame which interconnect theperimetral tubular branches are provided with "laterally-extending studs 134 extending into the grooves 129, and there provided with anti-friction rollers 135 by means of which the frame 132 may be rolled along the track 126, confined within its grooves 129.-t.- Centrally of the transverse tubular member of frame 132 is secured a bracket 136 which pro jects forwardly and upwardly, and at its up per end is provided with a plane face 137. To this face is bolted a horizontally extended expansive blank support 138 in the form of a wide but elon ated plate. This plate has its inner end for ed symmetrically with respect.

- to the transverse plane of symmetry of the machine inwhich the longitudinal center line .of the plate and the bracket 136 both lie.

Overlying this plate and secured also to bracket 136 is a resilient arm 139 paralleling the length of the plate slightly above the body. At its outer endthis arm is rovided with a centering pin 140 having a ob 141.. by means of which it may be grasped and the arm 139 bodily lifted with the pin. Upon release, the spring of the arm 139 carriespln 140 toward plate 138. Pin 140- is substan- The rails extend v tially in axial alignment with the crotch of the fork 138'. -Together with the erotch of the fork, the pin 140 constitutes a blank centering means establishing a blank feeding position for a blankrested upon the expansive surface of the plate 138. Y i

The groove 129 in the bracket track 126' is extended along several paths. Its uppermost portion is substantially horizontal and lies slightly below the top of the blank support B so that when the frame 132 is supported within it, the frame is substantially horizontal. Bracket 136'and plate 138 project a blank held by the plate upwardly at anangle to the horizontal. At its inner extremity this groove drops at right angles to a lower level, as indicated at 142, and there joins a return branch of the groove 129.,

The relative angularity of the platel38 and frame 132 is such that when this drop occurs, plate 138 is dropped not only to a horizontal position, as indicated in Figs. 3 and 5, but also to thehorizontal plane of the top face of the blank support B. The lower branch of the groove 129 at some distance from the inner end of the trackway is inclined upwardly and again joins the main branch through a switch 143, which is closed against entrance from the upper groove, and may be entered only from the lower groove 129. At its outer extremity groove 129 turns downwardly and inwardly along an arc-shaped path contained in segment 144 carried from the lower edge of each rail. This segment has a radius equal to the distance betweenthe spaced supporting studs 134 of frame 132.

l/Vhen the feeding-in mechanism 130' is drawn by frame 132 outwardly, the inner roller 135passes through the switch 143, and the frame is supported wholly from the upper branch of the groove 129 in a substantially horizontal position. The blank-supporting plate 138 is outside of the machine. A blank may 'now be placed upon plate 138 and slid under supporting pin 140 either by inserting its edge between the point of the pin and the crotch of the plate, or by grasping knob 141 and lifting pin 140 slightly. In either case, the knob 141 being released, the :pin enters an aperture punched in the center of the blank and centers it upon the holder, thus defining a feeding-in position. Thereupon the approach and separation mechanism A having operated to separate blank support B from the working rolls R and R the frame 132 is grasped and projected forwardlyalong the confined rectilinear pathway afforded by tracks 126, and the blank is projected in the space between the top of the lowered blank holder B and the working rolls R and R which are undergoing retraverse. At the moment the inner- Lesateel I the blank support immediatel over the blank the branch 142 of the trackway groove, and

the blank holder 138 and the blank drop with it. At'the same moment, the centering pin 140 is engaged on its under end by the upper end of the centering pin 46, releasing the blank from its slot and centered engagement with the feeding-in mechanism 130, and allowing it to fall over the conical upper end of the centering. pin 46 into centered engagement with the blank holder B. Thereupon the frame 132 is Withdrawn rearwardly, the outer rollers 135 ridingin the upper branch of groove 129, and the inner rollers riding in the lower groove 129, the plate 138 being withdrawn in" a horizontal plane from beneath the fed blank until its inner forked end 138' clears the edge of the blank. Immediately afterward, the inner rollers 135 engage,

' the switch 143 and pass into upper branch of groove 129, whereupon the normal horizontal position of frame 132 is restored and with it the normal position of the parts carried thereby. A second blank may then be inserted on the feeding position defined by the axis of the centering pin 140.

The blank-removing mechanism 131 is in its major aspects similar to the blank feeding-in mechanism 130. Similar parts are similarly numbered. The blank support plate 138, however, instead of being provided with a resilient arm 139, carrying the centering pin 140, is provided with a yieldingly mounted rigid arm 145 which on its'end carries a somewhat elongated downwardly projecting tubular pin 146. This arm is mounted "on a horizontal pivot 147v overlying the supporting plate 138, and is yieldingly urged toward the plate 138 by a spiral spring 148 engaging beneath its extended outer end. Both its pivotal mounting and its extended outer end are in the form of a bracket 149,'the main body of the arm-being tubular. This bracket carries a detent 150v on its under side. The detent, when the arm is raised, is engaged by a trigger or latch 151 having .a beveled upper end 152 spring-pressed to engaging position by spiral spring 153 carried by bracket 136, and is'pivoted at 154 on the bracket 136. The cradle 28 of the blank positioning mechanism P carries'an adjustabledog 155 engaging the extended lower end of the trigger 151 to efiect its release. The centering pin 146, as will be seen clearly in Figure 6, is tubular in form and. is angularly adjustable.

The longer portion of groove 129, in the case of thisremoving mechanism 13, is the lower portion. -The short branch instead of being the inner and lower portion, is the upper and outer portion, the drop 142 being located intermediate the ends of the longer lower branch. The location of switch 143,

- branc too, is changed connecting the lower and upper branches of the grooves 129at the outer end instead of the middle of the longer groove.

The angular relations of the parts are such that when frame 131 is withdrawn from the machine, theblank holder 138 extends angularlyupward, and the parts occupy substantially the relation shown in Fig. 3. Here the trigger 151 has been released and the centering pin 146 is holding the blank upon the blank support 136. By grasping the rearwardly-extending operating handle 156, the arm' 145 and centering pin 146 may be raised to the position shown in Fig. 6 until trigger 151 again engages the detent 150 and holds arm 145 in raised position. The removed blank may then be taken from the blank holder and the removing device 131 is ready to be operated to remove a succeeding blank. The blank initially fed to the machine having been rolled, and before the approach and separation mechanism has separated the blank holder B and the blank from rolls R and R the frame 132 is drawn backward a short distance until the outer rollers 135 pass throu h switch 143 into the u per short plane of the blank holder 138 to the plane of the upper face of the blank holder B. The frame 132 then being-moved forward with the outer rollers in the upper groove and the lower rollers in the lower groove, inserts the inner end of blank holder 138 beneath the dished edge of the blank being worked on the the same moment the lower end of the trigger 151 is engaged by the detent 155 on the cradle .28 in its lowered position, the trigger is pulled and arm 145 is projected toward the blank holder 138 by'spiral spring 148. This projects tubular pin 146 over the upper end of the centering pin 46. The relations of the lengths of the upper and lower branches of the grooves 129, and of the drop, are such that at this moment the outer rollers 135 are in position to enter the drop 142. The operator then depresses the rear end of frame 132 raising the worked blank from the blank holder center pin 46 and transferring it to I the removal position established by the'centeringpin 146 to the blank holder 138 of the removing mechanism 131. As this transfer takes place, the separating movement of the blank support B ensues, assisting the trans fer. The operator then withdraws frame 131 horizontally outward along the lower branch of groove 129, the parts being 1n the relatlve of groove 129. This 0 anges the positions shown in Fig. 3. Immediately afterward, the fresh blank mounted upon the feeding-in mechanism 130 is fed in by that mechanism.

Clearly I have obtained the objects of my invention. Not onl is my machine simple, sturdy and practica le throughout, but these and other objects and advantages are .attained with a great enhancement of the efliciencv of the machine as a whole. The work done isvery heavy, but the consumption of power is very economical. The embodiment a'single structure.- p v x Further, I have invented and been able to practice'in this improved machlne an enity which usually results through too great a concentration of mechanisms him about tirely new and, highly advantageous method ,of rolling, the outstanding advantage of which is that which enables the rolling operaations to be performed without the shock of impact of the working elements of the machine.- Other advantages are economy in operation and rolling, and a more accurate contour determlnatlon. ThIS method cons'ists in relatively completing the approach' movement of the blankand' the traversing rolls before the retraversing movement of the rolls toward the center ofthe blank is com-.

' the work at full depth, but

plete, whereby there results a gradual buildmg up of the working pressure of the rolls with the blank, free from harmful impacts incident to sudden building up, as in earlier types of machines. The rolls do some workduring the finishing of the retraversing movement, thereby working their way more readily to the depth desired and commence their outward of urdenedi with less work, wherebythe contour in the-inner regions of the blank is more accurately attained. This method I practice in this matravers-ing movement 'radiall chine through the establishment of the extended interlocking connection between dogs 21 and 19 during the retraverse movement of the" rolls R and R gradually bringing the toggles to locked position. The platen B actually reaches a maximum upward move- 1 ment of approach as the toggles pass over the center, and as they move inwardly over the center into the locked position, separate ever so slightly from the rolls R R This grad- 28 (see Fig. 1

ual movement builds up the pressure to its maximum by easy; stages after the first contact with the traversing rolls is established,

the rolls work toward their depth gradually,

and the proper depth is actually reached very soon after if not immediately upon the starting of the rolls on their outward movement of traverse. Through this method I achievea new cycle of operation, the travers ing of the rolls radially outward in working engagement with the blank, until they leave the edge of the blank, the ensuing substantially instantaneous separation movement brought about by the said unlocking of the toggles as dogs 21 engage dogs 20, the substantially instantaneous retraverse moveation of the limit switch of the control system (not shown) or any equivalent device, and the recommencement of the cycle as dogs 21 engage in extended contact with dogs ]19 before the retraverse movement is complete, thereby gradually approaching the blank and the working rolls, and gradually building up the working pressure.

It will be observed that dogs 19, 20 and 21 are duplicated for each toggle in the faceof the fact that the toggles are geared together. This, when the dogs are properly "set (as they always should be), insures a symmetry of distribution of the application of power of -ment of the rolls brought about through operthe approach and separation mechanism,

through the traversing mechanism. Notwithstanding, should there be any misadjustment, this, misadjustment is taken care 0' temporarily at least through the heavy gear between the individual toggles, and the machine will continue to do 1ts work in an acceptable if not a perfect manner. So, gross misadjustment is prevented from injuring the machine, and so minor misadjustment is equalized through the very mechanismitself.

Inrolling to an accuracy of fractions of thousandths of an inch, as can be accomplished in this machine, such symmetry of forced application and compensation for'misadjustment is of substantial advantage.

In the substantially instantaneous separa-. tion movement of my new cycle, the approach and separation mechanism is cushioned by the engagement of the cradle 28 with cushioning springs 157 socketed in the sub base, as

shown insFigure 2. The toggles are locked i in approached relation by the engagement of pads 159 on arms 34 with the faces of cradle The rolling operation may be of course carried out with the tension of. springs 82 and the resultant relative rigidity of position ofthe rolls B R set at any determined value. The pressure may be relatively low whereby the working rolls R R give to a greater or lesser extent through a substantial part or the whole of the working contact with the blank. Even though the platen is straight, I have found that I can roll tapered disks by a rectilinear traverse of such yield-' ingly held rolls on lines parallel incrementally at least to the plane face of the platen. This cient to hold the rolls to the work should the working pressure he built up by any abnormal conditions to a value in excess of the normal working pressure. 1 In this case, I dish or taper the face of the rotatable blank support B to assist the rolls in producing the taper desired. It is only necessary to assist them, since the unavoidable minimum of elasticity in the columns C, and other parts in the train supporting the working rolls R R and the blank support B in their relative positions, together with the natural take-up of lost motion and reduction in thickness of films, etc, produces some resiliency. Therefore, the actual dishing or tapering of the blank supporting platen B is at an angle of convergence to the rectilinear path of traverse of the rolls R R substantially less than the angle of con vergence of the tapered section of the disk desired. 4

The power for the rolling operation is largely supplied through the main driving motor 12 which drives the constantly rotating blank support B, and through frictional engagement with its supporting (and working) face, also drives the blank placed upon it and the traversing rolls R R But the power required for the outward traversing movement of the rolls R It? is also substantial. This power is in the major portion that required for the spinning'operation, whereas the power required for rotating the blank support B, the blank, and the rolls R R is largely the power required for roll ing. Rolls R It are, therefore, subject to a very high axial thrust. This axial thrust is taken up by thrust bearings 158, the radially-extending rollers of which are interposed between the central web 97 of the rolls and the adjacent raceways of the radial bearings 95, 96. The removable collar 122 is really a safety device or guard against the mis-application of this high traversing thrust in case through accident or design the 5 working rolls R R on their retraversing movement are allowed to abut each otherthrough the carrying frames 22. In such case the building up on retraverse ofthe extremely high axial thrust "breaks the bolts which secure the collar 122 in place and screw 1% thrusts gear 116 outwardly, sliding it out of .mesh with the idler 114 and automatically cutting off the power of traversing motor 89.

The number of modifications of which my invention may be found susceptible without departing from its generic spirit may be somewhat reduced by reason of its inherent simplicity, but it is without doubt sub ect to appreciable modification in most if not all phases without departing from its generic spirit and without sacrificing the objects which I have attained. -I intend that the annexed claims shall cover all such modificacomprising a head carrying a radially traversing blank working roll and a rotating blank support, said head and support having a relative movement of approach and separation to present the work to and remove it from the action of said roll, means for traversing said roll, and means operative as a result of said traverse to effect said approach and, separation movements.

2. A machine according to claiml in which the power for the approach and separation movements is derived from the traversing movements of the roll.

3. A machine .according to claim 1 in which the approach and separation movements are effected l by .a direct mechanical connection with the radial traverse mechanism of the roli.

4. A machine according to claim 1 in which the approach and separation movements are efi'ected by a direct mechanical connection of variable ratio so as to effect a fast separation and a slow approach movement.

5. A machine according to claim 1 in which. the approach and separation movement of the rotating blank support is efiected through self-locking toggles locked in the extreme of approach movement and unlocked upon the initiation of the separation movement.

6.. A machlne accordlng to claim 1 in which the approach and separation movements are effected by a direct mechanical connection with the radial trayerse mechanism of the roll through intere'ngaging dogs respectively associated with the rotatable blank support and the traversing mechanism.

7. A. machine according to claim 1 in which the approach and separation movements are edected by a direct mechanical connection with the radial traverse mechanism of the 1 roll, said direct mechanical connection asso ciated with the rotatable blank support and a the traversing mechanism and comprising two dogs associatedwith one of the mechanisms and one coacting dog with the other, which one'dog is momentarily in engagement with one of the two upon the initiation of the separation. movement, and extensively in engagement with the other during the approach movement.

8. A machine according to claim 1 in which the approach and separation mechanism comprises a toggle arranged on the opposite side us I of said blank support from said roll carrying head, and having a branch extended past said blank support into position for engagement with the roll traversing mechanism.

9'. A machine according to claim 1 in which the approach and separation mechanism comprises a toggle arranged on the opposite side of the blank support from said roll carrying head, said toggle having its lower branch extended upwardly past the blank support into position for engagement with the roll traversing mechanism.

10. A machine according to claim 1 in which the approach and separation mech anism comprises a toggle arranged on the opposite side of the blank support from the roll carrying head and having a branch extended past said blank support, the extended portion of said branchlbeing provided with a lateral extension substantially parallel to the plane of traverse of the working roll, and dogs carried by said extension for engagement with a coacting dog on the traversing mechanism."

11. A machine according to claim 1" in which the rotating blank support is raised and lowered to effect the approach and sepa- 4 port.

ration movements in combination with a blank feeding mechanism operating in a plane defining a lowermost extreme of the separation movement of said rotating blank supscribed, a base, a rotating blank support having axial driving means j ournaled in said base, and an approach and separation mechanism to movesaid blank support longitudinally of its axis, which mechanism flanks the [periphery of the'blank support axis of rotation and isarranged adjacent the and on op-. posite sides thereof.

14. A machine according to claim 1 in I which the approach and separation mechanism acts upon the blank support through a carrying cradle for the blank suplport supported against rotative movement ut free to move axially.

15. A machine according to claim 1 1n which the approach and separation mecha- -n1sm' comprises means for axially moving the blank support attaining rigidity in the extreme of the approach movement and maintaining the blank support locked in the extreme of the approach movement in the outward working traverse of the roll independently of the traversing mechanism, sa1d means being non-rigid in the separation movement.

16. A machine according to claim 1 in i,css.ses

which the approach and separation movement is effected through a system of toggles arranged between the base and the blank sup port. 17. A machine according to claim 1 in which the approach and separation mechanism is comprised of a transverse shaft in the end of the base removed from said blank support, and a toggle on each end of the shaft intervened between the same and said blank support. v

18. A machine according to claim 1 in which the 'approachandf separation mechanism is comprised of two transverse shafts extending through the base of the machine, said shafts being geared together and having toggles extending between the base and the blank support associated with the ends of said shafts.

19. A machine according to claim 13 in which the approach and separation mechanism underlies the perimeter of the rotating blank support, and operating means therefor having lateral and upward extensions past the work support. 20. A machine of the character described comprising a base, a cradle having a movement longitudinally of the base but supported against rotative movement, and a rotating blank support carried by the cradle and rotated from the base, together with means for longitudinally separating and approaching the cradle from the base.

21. A machine according to claim 20 in which the rotatable blank support is jour- Ealed both in said cradle frame and in said ase.

22. A machine according to claim 20 in which said rotating blank holder is provided with thrust bearings in said cradle and radial bearings in said base.

23. A machine according to claim 22 in which radial bearings for said blank support are also provided in the cradle.

24. A machine according to claim 20 in which the rotating blank support is driven by a spline connection with a relatively fixed rotating shaft journaled in said base.

25. A machine according to claim 20 in which the cradle frame has a cylindrical ide bearing in said base and additionally a non-cylindrical bea'ring.

26. A machine of the character-described comprising a main base, a sub base mounted thereon, a blank holder carried by said sub base at its extremity removed' from said main base, columns anchored in said main base at the foot of the sub base and independently thereof and extending past the sub base. to points thcreabove, a working roll head carried by said columns, and a working roll borne by said head and engaging the blank on the holder carriedby the sub base.

27. A machine according to claim .26 in which the columns flank the sub base and are spaced therefrom, and an approach and sep- ,ing roll and blank support is intervened between the sub base and columns.

28. A machine according to claim 1 in which the approach and separation movements are effected by a direct mechanical connection with the radial traverse mechanism of the roll, said connection being arranged in a plane parallel to the rotating axis of the blank support.

29. A machine according to claim 1 in which the approach and separation movements are effected by toggles and the roll is carried by a supporting frame interlocked with said toggles in a plane parallel to the axis of the blank support.

30. A machine according to claim 1 in which the approach and separation movements are effected by a direct mechanical connection with the radial traverse mecha nism of the roll, said connection being ar ranged in a plane parallel to the rotating axis and intersecting the perimeter of the rotating blank support.

31. A machine of the character described comprising a blank support, a roll carrying head relatively adjustable thereto, a blank working roll carried by the head, columns constituting the mounting for said roll carrying head and projecting there'above, bridges interconnecting the tops of said columns,-and yielding means between the bridges and said roll carrying head.

32. A machine according to claim 31 having an adjustable stop device against which such yielding means normally acts, whereby to set the degree of approach and separation of the blank support and the working roll.

33. A machine of the character described comprising a main base, a sub base mounted thereon, a blank holder carried by said sub "base at its extremity iemoved from said main base, a working roll head, a working roll borne by said head and engaging the blank on the holder carried by the sub base, columns anchored in the main base at the foot ofthe sub base and extending past said sub base to the top of the machine, said-columns carrying the roll head adjacent their upper ends whereby they are in tensionin the rolling operation throughout substantially their en tire lengths.

34. A machine of the character arranged with a floor on its bottom, having guides supporting the traversingroll bedescribed,- comprising a hollow roll-car ing head, a

of said head, a driving motor mounted on the other face of said head, said rolls having independent outwardly extended axes geared commonly to the axis of the driving motor.

38. A machine of the character described comprising a blank support, and a pair of traversing rolls having opposed axes, and independently traversable supporting frames for said traversing rolls affording them axial support from opposite sides, thesupport of which on the adjacent sides is constituted by a relatively thin plate. 7

i 39. A machine of the character described comprising a blank traversing roll, a supporting frame for the same, and a relatively fixed roll supporting axis carried by the frame and having a lateral extension through the intermediary of which said roll is traversed.

40.- A machine of the character described comprising a blank traversing roll, a U-.

comprising a blank traversing roll, a rigid member by means ofwhich said roll is traversed, intermeshed gears driving said member endwise, a casing enclosing said gears and of a width greater than the base of said gears, and a thrust collar on said casing, yielding whenever the bearing pressure exceeds adeterminate maximum to permit the gears to pull axially out of mesh 1 casing for said screw, and traversing mecha-- nism engaging said s'crew-Lwithin the casing to drive the same.

44. A machine according to claim 43 in @which the traversing mechanism includes an elongated worm gear complemental to said screw and journaled in said casing. [45. A machine according to clalm 43 m which said casing is closed at its outward end and open at its inward end, and a combined guiding and packing member is provided on the screw to work within theopen end.

46. A machine of the character described comprising a blank traversing roll having an axial movement of traverse and an extended supporting axis, and an oil-encased traversing mechanisnfengaging said axial extension and housing and lubricating the same.

47. A machine of the'character described comprisinga Work traversing roll having an axial movement of traverse, an oil-encased traversing mechanism deriving a rectilinear traversing movement, and connections between said mechanism and said traversing roll.

48. A machine of the character described comprising a roll carrying head, a working roll adapted to be traversed with respect to said head, and a traversing mechanism incliiding a unitary supporting frame structure by means of which it is mounted upon said head and through which the traversing mechanism may be removed as a unit from the head.

49. A machine according to claim 48 in which the head carries a prime mover releasablycoupled to said traversing mechanism, and the traversing roll is detachably coupled thereto. I

50. A machine according to claim 48 in which the roll head overhangs theends of the machine and the traversing mechanism unit is secured to said overhanging ends and depends therefrom to effect driving connections with the working roll.

51. A machine of the character described comprisin a worktraversing roll, and a shaft through w ich said roll is ournaled having the sub base, columns flanking said sub base I and spaced therefrom whereby said sub base may be removed between two columns; together with a blank Working roll supported from said columns.

53. A machine according to claim 52 in which'there is provided traversing mechanism adapted to traverse the working roll over a blank, and an approach and separation mechanism between the working roll and the blank support having a removable interlock with the traversing mechanism whereby either the working rolls or the sub base may be freely removed as a unit.

54. A machine ofthe character described comprising ablank support, a working roll adapted to be traversed over the same, a traversin mechanism for the roll an a roach o PP and separation mechanism between the roll and the support and havina removable interlock connection therewit whereby either the blank support or the working roll may be freely removed'as a unit independentlyof the other.

In testimony whereof signature.

Q .EMIL A. NELSON.

I hereunto affix my

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