US1923360A

US1923360A - Roll drive

Info

Publication number: US1923360A
Application number: US515208A
Authority: US
Inventors: Fitzgerald Edward; Raymond M Gleason
Original assignee: Individual
Current assignee: Individual
Priority date: 1931-02-12
Filing date: 1931-02-12
Publication date: 1933-08-22
Anticipated expiration: 1950-08-22

Description

1933- E. FITZGERALD El AL l,923;360

ROLL DRIVE Filed Feb. 12, 1951 Patented Aug. 22, 1933 warren STATES norm DRIVE 7 Edward Fitzgerald and Raymond M. Gleason,

1 Franklin, Ohio Application February 12,1931. Serial Natures 7 Claims. (01. e249) This invention relates to roll drives for press rolls and the like such as are used for example in paper making machinery.

One object of the invention is the provision 5 of a compensating friction drive for press rolls and the like, which provides for substantially no slipping between the paper web on the web carrying felt and the roll with which it cooperates.

Another object of the invention is the provision of a compensating friction drive for a pair of cooperating rolls, one of which is driven from a suitable source of power, drive means being provided for the other roll so arranged as to have a yielding adjusting means equalizing the peripheral speed of this other roll with the felt speed.

A further object is the provision of a roll drive of the character mentioned in which the upper roll is operated by a gear drive tending to rotate it at a slightly greater peripheral speed than the lower roll, the drive means includin an adjustable friction device.

Other objects and. advantages of the invention will be apparent from the following description, the appended claims and the accompanying drawing, in which,

Fig. 1 is'an' elevationalview, partly in section, of a pair of cooperating rolls havingdrive means embodying the present invention; 7

' Fig. 2 is an end view thereof; and

Fig. 3 is 'a sectional view of another slightly different embodiment of'the invention;

Paper making machines and the like employ power press rolls, and the like, running inpairs, one usually on top of the other, between which an endless felt 'is drawn. The felt serves to pick up' the paper fibersor to carry aweb that ultimately forms a paper sheet. exceedingly costly item and are subject to very great wear. due to slippage occurring between the roll and the felt; Ordinarily one of the rolls, usually the lower roll, is driven from a suitable source of power and the upper roll is rotated by the felt itself. ,Thusthe driving force tending to move the feltalcng is applied only to the lower surface of the felt, by the lower roll, and as the upper side of the felt serves as a driving medium for the upper roll, it will be apparent that the felt will be pulled, torn, and Worn so that its life may be only several weeks. While this pulling and tearing action takes place principally on the lower surface, it is also present the upper surface on which the paper web rests, as sufii cient power must be supplied to the upperroll These felts are an.

face, to rotate this upper roll. The resulting slippage between the paper web and theupper roll necessarily roughens and pulls the top surface of the web. F I v If both of the rolls are positively driven as by being intergeared together the two rolls will move at exactly the same peripheral speed if the'ratio of the speeds of rotation of the driving gears correspond exactly with the ratio of the diameters of the two rolls, but such an arrangementpulls the feltalong bythe application of power to both the upper and lower sides of the felt, and the slippage between the upper roll and the paper web objectionably'roughens the upper surface of the paper web. Furthermore, one roll may be a little larger in diameter than the other so if the two rolls are geared together'by gears of equal size one roll will have a slightly greater peripheral speed than the other, resulting of course in additional wear and tear of the-feltand paper Web surfaces. Even though originally the two rolls maybe of exactly the same size, it is frequently necessary to resurface the rolls as they become worn. The rolls ordinarily have brass or rubber surfaces and when wear takes place in one or both of the rolls it becomes necessary tochan ge the size of the gears and. to turn down worn rolls. y In accordance with the invention set forth in this application, which isa continuation' in part of our prior application for Letters Patent, Serial No. 461,518Qfi1ed June 16, 1930, all of the above mentioned disadvantages are obviated, and drive means are provided for the rolls so that friction between the paper web and the roll it engagesis obviated. This improves the quality of the paper and increases the life of the felts. .It also pre vents the corrugating of the, softer roll which might occur if the two roll shafts are positively Y geared together, thus increasing the life of the 95 rolls, and prevents felt picking, that is "the paper sticking to the felt when the'machine is running at high speed. The inventionis' applicable to rolls engaging a single felton which the paper web rests, or to rolls engaging-top I between them; g

Referring more particularly to the drawing by, reference numerals and first with reference to and bottom felts which carry the paper web:

and 11 of'a paper making machine, or the'like,

are mounted respectively on shafts'l2 and '13,

the rolls being covered with a layer of rubber, brass, or other suitable'isurfacing material. -'I'he.:

upper roll 11 constitutes the driven ro1l,:- while 91" ed against the friction grip disk 20.

the roll is the driver roll. As shown each of these rolls are of the same diameter although they could be of different diameters if desired. The shaft 12 is mounted on a suitable bearing 14, and is driven by a clutch 15 and drive shaft 16 connected to a suitable source of power. Mounted in locked engagement with the shaft 12, through the medium of a key 17 or the, like, is a gear 18 which meshes with a similar gear 19 carried by the shaft 13 in a manner to be hereinafter described.

Mounted on the shaft 13 is a friction grip,

disk 20 provided with a hub 21 which is fixed to the shaft by means of the key 22. The shaft 13 of the roll 11 is supported by a suitable bearing 23. The gear 19 is bushed as at 24 and is mounted on the hub 21 of the friction grip disk 20 to turn freely thereon, and is adapted to have one face thereof engage the face of the friction grip disk 20, the other face of the gear being shown flush with the edge of'the hub 21. I

Threaded in the hub 21 areaplurality of circumferentially spaced bolts. 25, spaced from the shaft 13 and parallel therewith, and extending for adistance beyond the end, of the shaft. Seated on the remaining portion of the shaft 13 is a friction grip disk 20 which is provided with circumferentially spaced openings through which the bolts -25 freelypass, thefriction grip disk 2G being freely slidable on the shaft 13 and bolts 25. The abutting faces of the gear 19 and friction grip disksZOand 20 are provided with adjacently positioned circular grooves 26 in which are positioned circumferential friction shoes 2'? made of metal or other suitablefriction material, these shoes being provided betweenthe gear and disks, and attached to either the gear. or the disks, if desired. 'Mounted on the bolts 25 and abutting the heads 25 thereof is a plate 28 provided with a central adjusting set screw 29 which has a lock nut 29. Spaced inwardly of the plate 28 is an additional plate 30 which is slidably mounted on the bolts 25 and which engages a coil compression spring 31 surrounding the bolts 25 and seat- The coil spring 31 functions to resiliently force the

friction grip disks

20 and 20 against the faces of the gear 19, the degree of pressure between the gear faces and the friction grip disks, being regulated by means of a set screw 29 as will be readily apparent from Fig. 1 of the drawing. Y

The twogears 18 and19 may drive the rolls at the same peripheral speedbut preferably are so constructed and arranged as to tend-to drive the rolls 1,0 and 11 at'rslightly different periphe For example, when the rolls 10 and 11 are of the same diameter, the gear 18 may be of the same 1 pitch diameter as the gear 19, but will have one tooth ,more than the gear=19. If the rolls 10 and 1 1 are considerably different in diameter, the

drive

gears

18 and 19 maybe so formed, as to pitch diameters and number of teeth, that the peripheral speed of the upper roll will be slightly greater than that of thelower roll, providing no friction obtains in the friction device provided in the drive means which interconnects the roll shafts. The compensating friction drive provided in the drive means for the rolls, however, may be readily adjusted so that the amount of slip page that occurs inthe friction device, between the gear 19 and the friction grip disks,--will be just sufficient to effect a driving of the upper roll at exactly the same lineal speed as the speed of the felt or other traveling web that is moving between the two rolls. No pulling force is therefore applied to the paper web by the upper roll and there Ewill be no tearing or shredding action on the upper surface of the felt or on the paper 'web. This, of course, permits the felts to be used over comparatively long periods of time before they need to be replaced. Let us assume that 12 horsepower is required by the drive of the two rolls 11 and 12. The roll 11 and its drive might absorb 3 horsepower in the compensating friction and gear drive bearings, etc. None of this 3 horsepower would be supplied to the felt or supplied from the felt. The remaining 9 horsepower would be supplied to the roll 10 and its drive and only part of this, let us say 6 horsepower, would be transferred to the lower sur-- face of the felt to pull the felt along, while3 horsepower :is absorbed in the bearings, etc., of the roll 10. Consider, however, what takes place in the constructions now in use, in which only the lower roll is driven while the upper roll-is rotated by the felt, acting as a belt. 9 horsepower might be supplied bythe lower roll to the lower surface of the felt and-3 horsepower would then besupplied by the upper surface of the felt or the paper web on it to the upper roll to overcome bearing friction, etc., of the upper roll. In those cases where the upper and lower rolls are positively geared together to run at the same speed and when the power is supplied to the felt equally on its upper and lower surfaces it will be apparent that the friction that obtains between the upper roll and the upper surface of the paper web will have a harmful roughening and tearing effect on the web that is entirely overcome by the present invention. 7 I

Fig. 3 shows a preferred embodiment of the invention. As shown in this figure the upper roll 11 of a pair of cooperating rolls of a paper making machine corresponding to the rolls 10 and 11 shown in Fig. 1, is drivenby the gear 35 through a friction clutch, the gear 35 meshing with a gear 36 fixed to the shaft of the lower roll in the same manner as set forth in Fig. 1. The roll 11 in this case may be of .the same diameter as the lowerroll, and the gear 35 would have one less tooth than the gear 36 so that the upper roll 11' tends to operate at a surface speed slightly greater than the peripheral speed of the lower rollywith which it cooperates. The friction clutch-comprises the opposite sides of the gear 35, the friction surface 3'7, and the friction

hlf grip disks

41 and 42; The friction grip disk 41 is preferably keyed to the end of the roll shaft .43 and rotatably supports the hub portion of the gear 35 and also carries the hub portion of the friction gripdisk 42. The two friction grip disks are provided. with interengaging lugs43 and 44 so that the two

disks

41 and 42 rotate in unison,

Threaded into the end portion 45 of the friction gripdisk 41 is a rod 46, provided coaxially with the roll shaft and projecting through a bore 47 in the end plate portion of the friction disk 42.

A coil compression spring 48 bears at one 'end against the outer side of the end plate and casing 51 can be taken off and the position of the spring retainer 49 adjusted along the rod 46 to provide the proper compression between the driving and driven members of the clutch. The amount of compression may be so adjusted as to cause the peripheral speed of the lower roll to be exactly in correspondence with the peripheral speed of the lower roll due to the compensating effect of the slippage obtaining between the gear 35 and the friction grip disks.

Preferably the friction surfaces 37 are oiled or lubricated and for this purpose the friction grip disk 41 is provided with one or more'oiling nipples 54 so that the oil may be supplied to the friction surfaces. As shown, the oil is supplied to the right-hand side of the friction disk and finds its way to the other side thereof and to the other friction surface 37 through holes 55, extending through the gear 35 and through the friction surfaces. preferably fixed in a suitable manner to the gear 35. a

While the forms of apparatus herein described constitute preferred embodiments of the invention, it is to be understood that the invention is not limited to these precise forms of apparatus, and that changes may be made therein without departing from the scope of the invention which is defined in the appended claims.

What is claimed is:

l. A compensating friction drive for press rolls comprising a driver roll, a driven roll, a drive gear rigidly attached to the shaft of the driver roll, a

driven gear on the driven roll meshing with said driver gear, disks concentric with said driven gear, friction members between said driven gear and said disks, and an oil supply coupling member on one of said disks, said gear having an oil passage from one disk to the other.

'2. A compensating friction drive forpress rolls of a paper making machinery comprising a driver roll, a driven roll, a drive'gear rigidly attached to the shaft of the driver roll, a driven gear on the driven roll meshing with said driver gear, and friction clutch means on said driven roll operatively connecting said driven gear with said driven roll and constructed so as to provide for slippage during normal operation, said friction clutch means comprising a friction grip disk having a hub rigidly mounted on the shaft of the driven roll, a slidably mounted friction grip disk, said driven gear being frictionally mounted on said. hub between said friction grip disks in frictional engagement therewith, and adjustable resilient means for forcing said friction grip disks yieldingly' against the opposite faces of said driven gear.

' 3. A compensating friction drive for press rolls of a paper making machinery comprising a driver roll, a driven roll, a drive gear rigidly attached to the shaft of the driver roll, a gear on the driven roll meshing with said driver gear, and friction clutch means on said driven roll. operatively connecting it with said driven gear to permit rotation of said driven roll, said friction clutch means com- 4. A compensating friction drive for rollsof the 4,

The friction surfaces 37 are,

. the rolls operating at substantially the character described, comprising a driver roll, a driven roll, a drive gear rigidly attached to the shaft of the driver roll, a gear on the driven roll meshing with said driver gear, a friction member fixed to the. shaft of the driven-roll and supporting said driven gear for relative rotational movements thereon, a second friction member mounted coaxially with said driven gear and said first named friction member, said driven gear being mounted between said friction members so as to be frictionally'clamped therebetween, spring means acting to yieldingly press said friction members together, means for adjusting the force of said spring, said gears having such diameters and tooth number as to tend to drive the driven roll at a slightly greater peripheral speed than the peripheral speed of said driver roll if there is no slippage of the friction members.

5. A compensating friction drive for rolls of the character described, comprising a driver roll, a'

driven roll, a drive gear rigidlyattached to the shaft of the driver roll, a gear on the driven roll meshing with said driver gear, a friction member fixed to the shaft of the driven roll and supporting means for. adjusting the force of said spring, said gears having such diameters and tooth number as to tend to drive the driven roll at a slightly greater peripheral speed than the peripheral speed of said driver roll if there is no slippage of the friction members, and a housing enclosing said spring means and supported on one of said friction members in a readily detachable manner. I

6. A press roll drive for a paper carrying felt comprising a driving roll, drive'means for said roll, a driven roll cooperating with the driving roll to feed a paper carrying felt through the nip of the rolls, gearing for operating said driven roll from said driving roll, cooperating friction clutch elements incorporated between one of the gears and one of said rolls and constructed to provide for slippage during normal operation, and adjustable yielding means for yieldingly governing the slippageof said friction clutch elements, said gearing, clutch elements and adjustable means providing for effective pulling operation of both of same peripheral speed.

7. A press roll drive for a paper carrying felt comprising a driving roll. drive means for said roll, a driven roll cooperating with the driving roll to feed a paper carrying felt through the nip of the rolls, gearing for operating said driven roll from said driving roll, cooperating friction clutch elements incorporated between one of the gears and one of said rolls and constructed to provide for slippage during normal operation, said gearing being constructed to drive the driven roll at a slightly greater peripheral speed than the speed ofsaid driving roll if there is no slippage of said friction clutch elements, and adjustable yielding means for yieldingly governing the slippage of said friction clutch elements, saidgearing, clutch elements and adjustable means providing for effective pulling operation ofboth of the rolls operating at substantially the same peripheral speed. EDWARD FITZGERALD. RAYMOND M. GLEASON.