US2676387A - Mounting for smoothing press rolls - Google Patents

Description

April 27, 1954 T. A. McARN 2,676,387

MOUNTING FOR SMOOTHING PRESS ROLLS Filed July 11, 1951 2 Sheets-Sheet l Q 2 Q LQ Ibai- :1-25% mw |.||||||L M We, ,a ..----....w.-:- 5. m Q X N/L n m z E 9 4 4----, -Il 4 Q 5 2 2 M 4 5 5 N j W -i o m l, L R w. w

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pril 27, 1954 T. A. MGARN MOUNTING FOR SMOOTHING PRESS ROLLS 2 Sheets-Sheet 2 Filed July 11, 1951 M a. H... ZM W .HHUHUI- M 90D j@ a@, Iilil W w 4 Y L@ IUI.

Patented Apr. 27, 1954 MUUNTING'FOR SMOOTHING PRESS ROLLS Theodore A. McAl-n, Downingtown,1Pa., assigner .to Downingtown `Man town, Pa.,

ufacturing Co., Downinga corporation oflennsylvania Application Jlily 11,A y1951, Serial No. 236,116

AThis invention relates a Anon-deflecting smoothing press roll.

Heretofore, considerable difficulty has been enf countered in providing a satisfactory journal for a smoothing press roll. Due to the size and weight of these rolls, it has been 'foundA that a roll mounted on. a .rotating shaft had so much deflection at the center ofthe -roll that undesirable results factory solution to theproblem.

Rolls of this sort are customarily about 32"in. diameter and 128 long and are loaded at 1,0Il 0-1 lbs. lper inch face, making a total load of 128,00

lbs. The shaft is customarily avsteelforging weighing about 7 tons and the outer shell of castv `to an improved paper, ymachine roll and has to do more particularly with.

iron is :3-4" Athick and .covered with hard rubber," n

stainless steel-,or similar non-corrodible material.

It will be understood that the static deflection in a roll of this size and weight is suiiciently` great to prohibit assembling 'the roll in a hori-V zontal manner. Heretofo-re, it has been neces'- sary to construct special equipment to press or shrink the sha-ft into the roll in'v a vertical position.

Therefore, in order to overcome some of the.-Y above diiiiculties and ,to provide a suitable roll' having uniform 'deection' 'and minimum bending moment, I propose to utilize a fixed shaft on which the shell is journaled through self-aligning bearings. horizontal assembly of the roll but also eliminates the necessity for the extremely heavy and This is due to the fact that there is no reversal of bending stress in the shaft because it does not rotate.

rugged shaft previously required.

My construction permits the shaft to be designed This construction not only permits as a simple beam subject to bending in only one plane.

A primary object of the invention therefore, is

to provide an improved mounting for a smoothing press roll,

A further object of the invention is to provide in a press roll assembly a stationary shaft on which the press roll shell is by means of self-aligning bearings.

A further object of the invention is to provide an improved drive device for an internally jour-- naled smoothing press roll.

Further objects will be apparent from the specification and drawings in which:

journaled internally' 5U 'Fi-g. kIl` is a side view partly sectioned. of :ai smoothing press roll constructedin accordance* with .the present' invention; Fig. 2v is an `enlargedsectional detail .of the drive end of the structure of Fig. 1; Fig 3 is an enlarged sectional detail of theL left' end of the structure of Fig. 1; f

Fig. 4' isa view similar 'to'F-ig. 2 .showing theAl relationship of 'the parts when the roll is "in ani' unloaded condition and in which the deflection:l is greatlyv exaggerated; and

Fig. 5 shows.V the structurevof Fig. 4 when -th'ef roll is loaded'. v

The invention comprises 4essentially the pro-f vision of a stationary'shaft for a smooth'ingpress' roll which isv mounted at eachv end `beyond the?.

shell of the roll on apair of swivel blocks. Thel roll shell is journaled vat two points on the-shaft? in such a way-that `the" distance from the journal? pointsl tothe' ends' of 'the shell providesminii'r'iu'mfy bending moment. 'A iiexible drive-is utilizedfor'- the shellI and this drive is so constructed to ac commodatefthe change in deflection which occurs I when'the roll is loaded. y l u Referring now *more particularly to the draw-.-

ings, miy improved smoothing' press. roll assemblycomprisesv a vcentral stationary vshaft I=`0 having tapered ends Illa and IUb vwhich are mounted in' swivel blocks If'IE and It'.` The shell'13' is provided wit-h a non-corrodible rcovering I4 such as rubber orsta-inless steel and the: shell is journaled yon shaftl by means fof selfhafligningbearings IBI and I6. Since the present construction does not use a rotating shaft subject to rapid reversals of bending stress, I have found that the location of bearings l5 and I6 are desirably spaced inwardly from the ends of shell I3 a distance of 20.7% of the length of the shell. In Fig. l, the dimension of X therefore is equal to 20.7% of L. In the conventional smoothing press roll described above, this location for the bearings is at the points which provide minimum bending moment. Without the use of a stationary shaft and selfaligning bearings, it was not heretofore possible to take advantage of the optimum construction that would produce uniformity in the paper from edge to edge.

Referring now t0 Fig. 2, it will be noted that bearing IB is pressed in the bore of shell I3 against a shoulder I1 and is retained thereon by an internal annular splined ring member I8 secured to the shell by one or more screws I9. A driving sleeve 20 is provided with an externally splined portion 2I which meshes with the internal splines on the ring I8 to provide a loose driving connection therebetween, and sleeve 20 is journaled at its outer end on a self-aligning roller bearing 22 mounted on the shaft I0. Spur gear 23 rigidly connected'to sleeve 20 is driven by any suitable gear train from a source of power (not shown) Lubricant for bearings I5, I6, 22 and splines I8 and 2| may be introduced within the bore of the sleeve and/or shell by removing plugs 24 and 25. Suitable oil seals 26 and 21 prevent the loss of lubricant, and the lubricant level is desirably carried suiiciently high to adequately lubricate all the bearings. A dam 2B retains suflicient lubricant for bearing 22 and a flexible annular collar 29 provides a suitable seal for lubricant between the sleeve 20 and shell I3.

At the opposite end of the shell I provide an end plate 3U secured to thelshell by means of cap screws 3I and it will be noted in Fig. 3 that bearing I5 is secured in place by means of an inner annular retainer 32 secured to the shaft by screw 33 and an outer retainer 34 secured to the shell by screws 35.

Referring now to Figs. 4 and 5, it will be noted that the tapered end Illa of shaft Ill is of asymmetrical form. Also bearing I6 is substantially centered when the roll is unloaded. In this event, the centerline 40 of the shell is substantially above the centerline 4I of bearing 22 so that the centerline 42y of sleeve 2G is tilted as shown in Fig. 4. In actual practice, the maximum deflection for each bearing should not exceed 4 (2 on either side of the vertical centerline of the bearing).l It will thus be appreciated that the showing of the relative positions of the parts in Figs. 4 and 5 has been greatly exaggerated in order to more clearly illustrate this feature of the construction. In the unloaded position therefore, the inner and outer races of bearing 22 are not in alignment but the axis of the outer race diverges upwardly with respect to the axis of the inner race. When the roll is loaded however, the deflection is so calculated that the centerline 40 of the shell coincides with the centerline 4I of the outer race 22a of bearing 22 (as ShOWn in Fig. 5). This of course, imparts a bend to shaft III that throws the inner and outer races of bearing I6 out of alignment in a manner similar to the misalignment of the bearing 22. The splines I8 and 2 I however, will now mesh evenly since the centerline of sleeve 20 likewise coincides with the centerlines 4I and 42. In this event, the outer and inner races 22al and 22h of bearing 22 will still be somewhat misaligned by an amount equal to the bend in shaft I0. However, this is of no consequence because there is a straight drive between gear 23 and the shell I3.

It will thus be understood that the present invention enables the assembly of the press roll to be greatly facilitated, it prolongs the life of such rolls by eliminating stress reversals in the roll shaft, and permits the roll to be designed for minimum bending moment.

Having thus described my invention, I claim:

l. In a press roll assembly comprising a stationary shaft having a central portion and normally misaligned end portions, said end portions actuatable into alignment with said central portion upon loading of said shaft, a shell mounted coaxially of said shaft central portion, a pair of self-aligning bearings spaced inwardly from the ends of said shell rotatably mounting the same on said shaft central portion, a hollow driving sleeve for said shell mounted abouty one end of said shaft, a self-aligning bearing at one end of said sleeve journaling the sleeve on the shaft, and a flexible driving connection between the other end of said sleeve and the interior of said shell.

2. In a press roll assembly comprising a stationary shaft having a central portion and normally misaligned end portions, a shell mounted coaxially of said shaft central portion, a pair of self-aligning bearings spaced inwardly from the ends of 4said shell rotatably mounting the same on said shaft central portion, drive means in engagement with said shell and normally misaligned with respect to the shaft central portion, and means including a hollow driving sleeve mounted in engagement with said shell responsive to loading of the shaft to align the drive means with the shaft central portion.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 1,595,544 Farrell Aug. 10, 1925 1,802,461 Domzi Apr. 28, 1931 1,868,860 Von Reis July 26, 1932 2,025,746 Horton Dec. 31, 1935 FOREIGN PATENTS Number Country Date 493,601 Great Britain Oct. 11, 1938

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