US1708800A - Mill for hot rolling radially-tapered disks - Google Patents

Description

April 9, 1929.

W/T/VEZS355 Filed Aug. 21, 1923 14 h ts-Sheet l April 9, 1929. O OTTE MILL FOR HOT ROLLING RADIALLY TAPERED DISKS Filed Aug. 21, 1923 A v 14 Sheets-Sheet 2 April 1929. o. M. OTTE MILL FOR HOT ROLLING RADIALLY TAPERED DISKS Filed Aug. 21, 1923 14 Sheets-Sheet 5 0% My WWW WWW April 9, 1929. o, OTTE 1,708,800

MILL FOR HOT ROLLING RADIALLY TAPERED DISKS Filed Aug. 21, 1923 14 h66t 4 FIG.4-

April 9, 1929. 0. M. OTTE MILL FOR HOT ROLLING RADIALLY TAPERED DISKS Filed Aug. 21, 1925 14 ts-Sheet 5 April 9, 1929- 0. M. OTTE MILL FOR HOT ROLLING RADIALLY TAPERED DISKS Filed Aug. 21, 1923 14 Sheets-Sheet 6 WITA/EGSES April 9, 1929. 0. M. OTTE MILL FOR HOT ROLLING RADIALLY TAPERED DISKS Filed Aug. 21, 1923 14 eets-Sheet 7 l I llllllllllll II ll I l 4 l I I l I I I I 0cm. 6% 7/ m 7k 6A; (20* WITNESSES April 9, 1929 o. M. OTTE MILL FOR HOT ROLLING RADIALLY TAPERED DISKS Filed Aug. 21, 1923 14 eet -Sheet-B April 9,v 1929. o, OTTE MILL FOR no'r ROLLING RADIALLY TAPEHED nxsxs 14 Sheets-Sheet 9 Filed Aug. 21, 1923 ag 6x622 1 yg gog 7w QM April 9, 1929. I Q E 1,708,800

MILL FOR HOT ROLLING RADIALLY 'I'APERED DISKS Filed Aug. 21, 1925 14 t h et 10 gmww.

o. M. OTTE 1,703,300

Filed 12- 1, 1923 14 Sheets-Sheet 11 MILL FOR HOT ROLLING RADIALLY TAPERED DISKS April 9, 1929.

d dE April 2 o. M. OTTE V MILL FOR HOT ROLLING RADIALLY TAPERBD DISKS Filed Aug. 21, 1923 14 sheets -sheet 13 IIIIJ WITNEwES v d. (FKWM.

April 9, 1929. o. M. OTTE MILL FOR HOT ROLLING HADIALLY TAPERED DISKS 14 Sheets-Sheet 14 Filed Aug. 21, 1923 Hui BN MZk w/mms Patented Apr. 9, 1929.

UNITED STATES UTE-EU 003110, 013

GOIMITEFANSZ", till Eli JL VITA.

.lillH irvee-iion 1 l tapered iii Hl Cll Iricetion of heels for motor vehicles; and more permill i o hot rolling such disks.

pend-i opp etron for United States it tiled bv lire on he ollv numbered $89315 illv list 4., 1921 and eerihzr've disclosed one oiling such disks and in an appliii serially munbered r-08,350 filed by me terner l have disclosed one )0 o 7 mill bf, me: no of which such irlethod may be vreefieed.

i i; oil this invention is to improve the l 'ioriiie applications 2. Way, the mill of said tor-me]: eemhles the will of this zippli- '11 certain important particulars .r alien dill'ors nmterielly lorm-er ippliootrons,

. on: the im'n'aziu the and the roll core rollingeheod ot the 0011- A which the blanks MIG eaueed to rorolling The :tiiiished dis {S 1 "t on one lid 3 an d on the other side are redi leper-ed uniformly on it straighttaper vi-om Ellllflllfll. control fiat arm to the diets The dishs therefore, re-

lively [let trunca ed conesi re the blziiilrs ore rolled o'l't center, it is M3 to have the active lie co oi the roll it uh ventricle with the tapered :tnce ot the l:

7 oi center itlllli nor-n finished, concevod or iiiii'lirved eo as conform to the surface of the finished lI. the line of rolling. ll heil two 1 '0 rolled so. milte-rieoiisly the active Joth rolls must he nieurved.

preiient mill iii the 'toriiier, one of oils din-inerolling is tilted toward the .f 4 .4: 4. lot :1 point between the center or LllO he rolhmre conical or more truly ere truniriited cones and the point about which one roll :iiiioim or this d tiring: rolling r located n the gmriol the smell onev of the roll. or in he roll Contact lii e or hire oft sold tormer :iopliceliions the roll hii'viogi;

. time incurred from e d to end to rm to the ed dish con. iiriieoe oi alone; the llll'i oi rolling. i i about a! point in t-h he e exit: of mid roll he bleiilt end its foriph- "e point in the roll For.

tact line.

i s periphery. lo the present milh' o JJISKS.

1, 1923. Serial. No. 653,541.

The will of the former applications is of the ordinery type in which the "oils have bearill at each end and in said mill the roll 3.31653 are disposed in the same VGlllCill plane and the blanks during rolling rotate about at rerti- (2:: artist lathe present will, the roll axes ere arranged in the more hoiFl ioritel plane end the disks during rolling: rotate about or horizontal axis located below the plane incli'iding the roll axes. In the former liiill the angle between. the roll or; is progressively increased dmiui5; rolling, While in the present mill, the angle between the roll axes is progressively decreased.

l1] the former inilh as Well as in the pr assent, mill, the rolls ere separated beyond normal position for the PI'EL'POSG oi inserting the lllPHli'S and for 'emoviilg the linisl'ied disks,

In the present mill, the position of the Jlzllllifi; with relation to the rolls during; rolling allows the scale at: i t is emu-li d and loosoiled by the rolle to fall ewe from the rolls.

Since the entire thee o each roll along the line of 1'olli1 '5 o. lr qierbolie curve ooirtormleg: to the disk surface along such line and since the ong uliirity oi the rolls is proggros sivelv changed during}; roll, one face oi ouch blonli: 1:; rolled into conv )1 term, and as the rolling orogrressete the convexity of said three is reduced until line] reduction ot the ilimlt occurs when this thee tithes the term of :1 truncated come he wing; straight sides.

ll letel dislrs such as those mad accordance with this invention are applicable "tor we in the monutt'ectiire of metal disk Wheels tor motor vehicles and iii the fabrication of one disk wheel Wi e which I am familiar, 2r eel dish 28 in diziineter: tlet on one side it. on the other towered radially from it C0fflitlot eves El diameter is used llhe ll ziree lFl .l W in thickness and the d sh from too edge oi? this control area tempers to Air 057 in thicl znee'ii-i the disks outer ierioh- .l MTV.

For the 'DHTUDOSQ of rolling; radio ly tapered dislts oi the d eiisioiis given, I lTiilCQ to era-- ample :1 mir of circular? blanks each in thiokoese 22122:? i i diameter and having: 2L oirmilm' hole punched at its (-eii'teiz The blanks ow heeled to roper rolling temper:

' 1 him to time in superposed relehvlsi for rotation so that their con"- 1 In 3.5? helow mid 'lzhereilore ahead of the i. no imlidiiroj the roll axes Dru-mg rolling one of the rolls moved horizontally in such manner that it is tilted toward; the other about a point in its active face. 'The tilting movement is progressive and is regulated .in accordance with the amount of reduction desired in the blank and {the degree of taper desired in the finished disk.

and the disks are subjected to a number of dead passes for the purpose or plaiiishing thedisks and stretching the same level. The

roll axes are angularly disposed in the same horizontal plane and one roll is mounted in a stationary housing while the other is V mounted in a housing which-is capable of be- ,ing' moved horizontally in order .to separate the, rolls for the introduction and removal 50f the work. After the blanks are introduced themovable rollis nioved into contact with the blanks and during rolling this rol'llisswungor tilted toward the other roll 1 abouta point-ii the roll contact line located T inthe periphery 'ofthe small end of the roll. I

X25111, this way the small end of the roll deaie blank to be taperedQ scribes: the circular flat area on the side of The blank supportisso constructed and I arranged that theaxis about which the blanks -.rotate during rolling is 'approx mately 3.5 "below the plane including the roll axes. The

l blank holding means resists movement of the i blanks through the rolls. 1

hebla'nk holder is formed part by a supporting frame secured to the bed plate of'themill and in part by a novel form of tongs for gripping'the blanks.

ping jawsare constructed so as -to rotate with the blanks and are water cooled; the water cooling arrangement beingsuch that when the blanks areshoved intoplace betweenthe rolls, the water for cooling is automatically turned onfand in. like manner is automatical'lyturned oil. when the l'lilISllGClCllSkS are :ofthe roller.

removed; :troin the rolls.

- The clamping jaws are held. in contact with the blanks by air pressureunder the control The gears connecting: the rolls. are so formed that they always remain in mesh even during movement of the movable roll and its fhousing bodily away'from the fixed or staf 'tionary roll.

"InZt-he drawin s accompanying and form- Fig. 2 is a vertical-section through a portion of the in'illtaken onfline 22 of Fig. 1. Fig. 3 is 'a=fron't view in elevation of the mill looking'toward the roll faces. In this view as well as in Fig. 2, the device for holding the blanks duringrolling, together with its assoc ated parts, lia's'been removed. Fig. 4 is a vertical section taken on line +l-4l of Fig. 1 tliroughthe shiftable roll housing. Fig. 5

The gripis a view partially in top plan and partially in section of a portion of the mill and illustrates the mechanism for moving the shiftable roll toward and from the stationary roll in order to enter and remove the work. Fig. (3 is a vertical section taken on line'tP-ti of Fig. 5. Figs. 7 and 8 are views of cam elements utilized in the iiierlianism for shifting the movable roll housing on its supporting element. 9 a plan view of the pivot table or element which directly supports the housing for the shiftable roll. Fig. 10 is a side view taken on line 10-10 of Fig. 9. Fig. 11 isa top plan view of the bed plate of the mill. 12 is 2. side view partially in section and partially in elevation of the roll end of one ofthe roll spindles with its associated gear. Fig. 13 is an end view in elevation of the large end of one of the rolls. Fig. 14 is an end view of the roll end of the spindle. Fig. 15 is an assembled view in sectional elevation of one of the rolls, its associated gear and the roll end oi the spindle. Fig. 16 is a top plan view of the blank holding device and in this view the ends oi the rolls are shown :in top plan. Fig. 17 is a view in side elevation of the parts shown in Figs. 16 and 17. Fig.

19 is a view partially in plan and. partially in section of a portion of the blank holding means. Fig. 20 is a view in side elevation of the portion of the device shown in Fig. 19. Fig. 21 is a sectional view taken on line 2121 of Fig. 18. 22 is a view in elevation of the frame or support member for supporting the blanks in position during rolling. This view is taken from the roll side. Fig. 23 is a frontview in elevation of the supporting frame or member shown in Fig. 22. Fig. 24 is a side sectional view of one-half of the support member shown in Fig. 23, and is taken on line 21-84; of Fig. 23. Fig. 25 is a view in side sectional elevation of the cooperating clamping jaws used'in the make-up of illustrates the channels for distributing cooling water from a point adjacent the axis to the jaw periphery. Fig. 28 is a view in side elevation of one of the jaw holders. Fig. 29 is a view in section taken on line 2929 of Fig. 28. 30 is a sectional view of the aw lioldertaken on liiie 30-3O of Fig. 28. Fig. 31 is a sectional view of a locking plate used with the jaws. Fig. 32 is a diagrammatic view which illustrates the method of rolling the blanks ofi center.

T he mill proper.

A roll which I term the stationary or fixed roll is mounted for rotation in bearings carried in a housing 41 rigidly bolted to the bed plate 42 of the mill, and a roll 43, which I term the movable, tilting or swinging roll is mounted for rotation in bearings carried (ill in housing 44 which is capable of being oscillated horizontally, lirst tor the purpose of separating the rolls beyond normal rolling position tor entering and ren'ioving the work, and second, for the purpose of swinging the movable roll toward the fixed roll about a point in the roll contact line.

The bed plate of the mill (shown in detailin F 11) provided with a circular opening 45 having a depending annular bearing flange 46 (Fig. 2) and an elliptical opening 47.

A pivot table 48 provided with a depending circular boss 49 is supported for movement upon the bed plate about the vertical. axis of circular boss 49 as its center of oscillation. The pivot table 48 is provided with a depending annular flange 50 which lies within elliptical opening 47 in the bed plate and the oscillations of the pivot table are thus limited by the Walls of elliptical opening 47.

Housing 44 for the movable roll is providcd with a depending circular boss or lug 51 which snugly fits a circular opening 52 in" the pivot table and this lug extends through the bed plate and is concentric with annular flange 50. From this, it will. be seen that roll housing 44 is capable of horizontal oscillaa-tion, first, about the vertical axis of lug or boss 49 of the pivot table and second about the vertical axis of lug or boss 51 of the roll housing 44. Movement about the axis of lug 49 01" the pivot table limited by the elliptical opening 47 in the bed plate provides the movement 01 the movable roll bodily toward and from the fixed roll for the purpose of entering and removing the work and for moving the movable roll into contact with the roll preparatory to rolling. The second movement or that about the vertical axis of lug 51 of the roll housing 44 is utilized in vinging the movable roll toward the fixed roll to decrease the distance between the rolls during rolling, and, since the movable roll is swung or tilted during rolling about a point in the roll contact line, or, in other words about a point in the surface of the blank with which the movable roll contacts, the position of the vertical axis of lug 51 is determined. by the total thickness of the superposed blanks entcred between the rolls.

The movable roll housing and the pivot table are held in place against vertical move ment by means or hold-down clamps 5352 5.33, 54 and 55 which are bolted to the bed plate and overlie bearing flanges formed on. and which project outwardly from thebase of the movable roll housing.

The bed plate on opposite sides is provided with upwardly extending posts 56 and 57 an d a tie rod 58 extends through openings in the upper ends of said posts and is securely held in place by means of stop collars 59 and 60 and a wedge device 61. A stiffening member 62 formed integral with the bed plate extends below and across the bed plate between posts 56 and 57. The tie member 58 and the still' ening member 62 co-operate to prevent distortion of the bed plate during rolling.

The rolls, or more properly, the roll. spindles 68 and 64, are geared together adjacent the rolls 40 and 43 by means of bevel gears and 66. These gears are formed so as to remain in mesh during the entire movement of roll 43 away from roll 40, limited as it is by the walls of elliptical opening 47.

Spindle 64 of the fixed roll 40 is driven by a suitable electric motor (not shown) through gearing 67.

The roll swinging mechanism.

tending stub shaft 71 which is journalcd within a bearing opening ilOlD'lOCl in the bed plate. The cam is provided with a squared shait 72 which projects upwardly above the body portion and an opening cam 73 having a cam member 74 is provided with a squared opening 75 which snugly tits squared. shait 72 of am member 70. The body of cam member 73 is cylindrical and this cylindrical body is journaled within a bearing plate 76 bolted to the top of a cam post 77 formed integral with the bed plate. This cam post is provided with a wear plate 78 secured thereto and which has its inner bearing surface curved to eonform to the body portion 70 oi. cam 69. it. post 79 which projects upwardly from the pivot table 48 carries a wear plate 80 against which cam 69 bears during closing movement of roll 43 toward fixed roll 40. A. cam plate 81 bolted to the top oil post 79 is provided with an opening 82 which embraces o icning cam 7 4 by means of which roll 43 is moved away from fixed roll 40. Opening 82 is rectangular as shown in Fig. 5.

Both the top and bottom, ot the pivot table as well. as the bottom of roll housing and. the top ot the bed plate are in achi nod, and are provided with suitable oil grooves and oil g'ioclqets to ensure relatively easy sliding of the roll housing on the pivot table and the pivot table on the bed plate.

Post 57 of the bed plate is drilled through from side to side in such manner as to provide two bores within the lar oi which an internally threaded bus-hi .g 83 is located. A screw 84 threaded into bushing 88 is prolit) iii)

' vided atits inner endwitha curved face 85 I 1 which bears-against acorrespondingly curved tfafceon a barmgblock'StS seeuredto the outer 'side of housing 1 1 torthe movable roll. The

other end 87 of screw 84 is squared and a worm wheel :88provi'ded with asquared hole isinou nt'ed on this squared end otthe shaft -s'o 'th'at as screw-8 k isturned in against bearing block86 by the worm wheel-88, the shaft ;Will slide within't-he Worm wheel. A yoke member 89 holtedto oppoisite sides of post 57 as shown in I, surrounds worm wheel 88 and-the outer-fend 87 of the screw 8 k and t holdszthe worm. wheel in place when the screw'84 is backed outofbushing 83. 7

Roll housing 44. and therefore, roll 43 is i moved by'screw 84 about the vertical axis of lug 51 otthe roll housing during rolling and M is returned to normal or starting position themoftor 9'9 bymeans of a relatively stiff whenthisscrew is backed out by reversing coil spring which is positionedbetween the inner side of rollv housing i and a spring abutment member 91 adjustably carried'on a screw 92- which isthreaded through a support member 93-carried by-pivot table 48 adjacent depending lugor boss 49. Worm wheel 88 meshes with a "worm gear 94 the shaft of which carries'a pinion which meshes with a gear 95. The shaft 96 upon which gear is mounted, carries a gear97 with which-the pinion-'98Iof the electric-motor 99 meshes. The'operation of motor 99 is under 0 The movable roll and its spindleis illustrated -in'F ig 2 andthis, therefor'eywill bedescribed. flThe'spindle is hollownndjatthe roll end is enlarged in diameter. The enlarged diamthc control of the roller and the control mechanism for this motor (not 'shown) is positioned' djflcent lever 68.

I Roll. and construction. The tworolls and the two spindles ot the mill are substantially identical and are shown in detailin Figs.'1, 2 and 12-15 inclusive.

eter is provided with aftapered bearing sur- 'iace 100'w hich: is journaled within a tapered "bearing 101 carried in the roll housing. The

, naled within a bearing member-.102 carried in j opposite endoiithe -spindle from the roll is provided with a" cylindrical bearing ourthe" roll housing. ,Thrustbearings 103 and V 104: secured to'the spindle are positioned on opposite sides of an abutment member 105 formedas' apart of the roll housing. 1 The H Y vent tapered bearing face 100 ,ofthe spindlethrust hearings will preferably be of the tapered roller typesuch as Timken bearings and thesewill'b'e so adjusted'asfto pretrom contacting with tapered bearing 101.

"Tlietapered bearingserves-more as a steadymg, member and holds the roll in position.

i d. Both thetaperedlbearing of the spindle as wel.l as'the cylindrical hearing are flooded with oil-as-fare also the thrust bearings.

, the spindle.

'The spindle at the roll end is provided with a cylindrical seat 106 to receive gear 05. The gear abuts against a stop shoulder 107 and is keyed to the spindle by means of keys 108 as shown in Fig. 12.

The end face of the spindle at the roll end is bored out at its center to provide a circular recess for the reception of a centering plug or disk 109 which lies within the recess and projects outwardly therefrom. This spindle end face is also provided with 4 key ways 110 for the reception of keys 111, (Figs. 12, 14 and 15),-which are held in place in their key ways by screws 112. Centering plug 109 is also secured within its recess by means of screws 113.

Roll 43 in its larger cndis provided with a centra l circular recess adapted to fit centering plug 109 and with key ways 114 corresponding to the key ways in the end face of v These it keys 111.

- The roll is drilled through from end to end as shown at 115 and the inner end of the bore thus formed is threaded to receive the threaded end of pipe 116 which extends outwardly through the hollow spindle and beyond the outer end thereof. The inner end 117 of this pipe is plugged and the pipe is provided with oneor more openings 118.

The outer end of pipe 116 is centered and sup- I :member119 holds the roll 43 in position on the spindle.

ater from any suitable source 1s admitted I to pipe 116 through'a water connection 121.

The water flowing in through the pipe passes out through holes 118 into the hollow spindle surrounding the pipe and flows out of the spindle through channels 122 and 123 formed in the centering member 119.

B Za nk holding mechanism.

' The blanks (two or more in superposed relation) raised to proper rolling temperature are gripped by the helper with a pair of tongs of peculiar construction whichare suspended and counterbalanced as is now common. The tongs are entered within guide ways in a supporting frame or structure and shoved to position against stops.

The tongs are provided with gripping jaws which securely grip the blanks and which are free to rotate with the blanks during rolling. The supporting frame or member is provided with air cylinders arranged on opposite sides of the tongs in line with the gripping jaws. VVl1cn the blanks have been moved to position, the roller admits air to the air cylinders by means of a three way valve (not shown) and the gripping jaws with their blanks are locked in posit-ion.

The grippmg aws are water cooled and r 7 Q V V 1,708,800:

ch lllnels 168 which connect with a centrally located channel 169 drilled in the knob por-' tion of each gripping jaw from its convex I The water distributing-r 'channels 168. terminate at the'periphery of the gripping jaw which at) this point. is cylindrical.. Each ing jaw carries a loose ring 171 which act asa, bafileringior the water discharged outwardly through the water distributing channels 168.;The water passes laterally I through thespacebe tween the ring and the per phery of the gripping aw and fallsbjy gravity tothebed plate of the mill.

- The tongs support frame on each side above the-guidewar-3:127 for that side, car;

' ries a coolingwater distributing valve dei vice sliown in"detail-in Fig; 19. This con- -s stsjoi avalve-housmg 172 having an mwardl ro, ectln iidia hra 'nraartition 178 )roi a r l vided, with acentrally located circular opening for the reception of a valve member I iii 4.] The valve member 17 1. is hollow and open atflits' outer end 17 5. The inner end of;,the valve. member is closed by means of'ajhfead 116 and 1s provided with a I of suitable piping- 181: (Fig. 22)-.is connected to a suitable source of water supply, Each armil la ofithe tongs is provided with a l cuppedconnector member 182 whichis adaptedtocontact with valve, member '174when the-tongsare shoved topo'sition in guidedways 127 M. the tongs supportv frame; The 'int 'erioi: of cupped" member 182-: connects with a; channel 18 1 drilled in its-arm 7143 'of'the tongs; A cross channel 185 connectschannel; 18 1 with a channel 186' drilled inthe f bearing block 155; This channel "186 at all t ji ni es.,connectswithchannel 169,, drilled inthefknob like portion of the gripping n'iovedw from" ji'olling position, the. flow of -wate1' .to'tl1e gripping aws will be cut oili'. V

Irla-imis Eachbearingblock 155 is drilled throi'igh from side to side to provide an oil or grease: channel 118?; This channel intercepts the concave. bearing surface 157 toform an oil opening 188 The channel 187 registers with anoil. channel l89 dnilled in the vtongmem- -ber143l fThis-allows ai's'uitable supply of oil or gre ase to be fed to' the-bearing surface 157.

" r Hayin thus described in T invention what 5 7 i In',,a;m;11 as n radially tapered disks, a pair of overhung. rolls one at least as of which has its active face incurved from end to end, means for tilting one 01": said rolls toward the other during rolling in the plane common to the roll axes, and means for supporting a blank for rotation during rolling about a fixed center outside of said plane.

2. In a mill for rolling radially tapered disks, a pair of overhung rolls one at least of which has its active face incurved from endto end, means for tilting one of said rolls toward the other during rolling in the horizontal plane common to the roll axes, and means for, supporting a blank for rotation during rolling about a fixed centcr outsidc ofsaid plane.

3. In a mill; for rolling radially tapered disks, 2. pair of overhung rolls one at least ofwhich has its active face incurved from end'to. end, meansfor tilting one of said rolls toward. the other during rolling in the plane common to the roll axes, and means for supporting a blank for rotation during rolling about a fixed center behind said plane.

4:- In a mill for rolling radially tapered disks, apair of overhung rollsone at least 01 which has its active face incurved from end to end, means for tiltingvone of said rolls toward the other during rolling in the horizontal plane common tothe roll axes, and means forsupporting a blank for rotation during, rolling about a'fixed center behind said lane- 1 5 n a mill for rolling radially tapered disks, a pair of overhung rolls the axes of which lie ina common plane and one at least. .of which has ltSfLCtlVG face concaved, means connecting said rolls, means for progressively varying the angle. between the roll axes during rolling and means for supporting a blank for rotation during rolling about a fixed axis outside of the plane common to the roll axes. V

6; In a mill forzrolling radially tapered I disks,.a pair ofoverhnng. rolls the axes of,

which lieina common plane and at least one of which has its active. face concaved, means for progressively varying, the angle between the roll axes during rolling, means for supporting a blank for rotation by said rolls about afixed axis outside of the plane including the roll axes.

7. In a mill, forrolling radially tapered disks, a pair of overhung rolls the axes of which lie in a common plane, means for mov- -.ing-oi1e ofv saidrolls toward and from the other for entering and removing the work, means'for tilting one of said rolls. toward the-other during rolling and means for supporting a blank for rotation by said rolls.

'8. In a mill-:for rolling radially tapered disks,a pair of overhung rolls, gears connecting 531d. rolls, means for moving one of saidrolls toward and from theother for en-

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