US1953060A - Dandy roll - Google Patents

Description

April 1934. E. E. }BERRY 1,953,060

" DANDY ROLL V Filed Feb. 2, 1931 3 Sheets-Sheet l April 3, 1934. E, BER Y 1,953,060

j, 542 5 7UM%MWZZ W April 3, 1934. E. E. BERRY 1,953,060

- I DANDY ROLL Filed Feb. 2, 1951 5 Sheets-Sheet 3 Patented Apr. 3, 1934 I UNITED STATES PATENT OFF-ICE DANDY ROLL Earl E. Berry, Beloit, Wis., assignor to Beloit' Ironworks, Beloit, Wis., a corporation of Wisconsm Application February 2, .1931 SerialNo. 512,770

8 Claims. (01.92-48) This invention .relates to paper making mais also positioned to direct a flow of steam or air chines and has special reference to the construcagainst the outside surface of the roll at the point tion and mounting ofthe dandy roll thereof. at which it leaves the surface of the sheet. The

The dandy roll is rotatably supported above purpose of this shower isto prevent the water of g thesheet being formed in the paper machine the sheet from raising up along the surface of the 0 somewhere between the suction boxes, one or roll by capillarit-y and the movement of the roll,

more thereof being positioned on each side of by driving it downward against the sheet. It

the roll. The function of the dandy roll is to will be seen that as the diameter of the rolls inbetter the formation of the'sheet. Afurther funccrease it will be necessary to place the latter far- 10 tion of this roll is to reproduce in the sheet certher and farther away from the line at which the 66 tain desirable characters or designs appearing on roll'leaves the sheet, the efliciency of the spray the roll by means of water marking. This should being proportionately decreased. The difliculty not, however, be confused with undesirable water with the use of this type of'spray lies in the fact marks caused by defective dandy roll construction that it is impossible to direct the steam directly or operation presently to be described. Because to the source of the trouble. The shower is palliaof the delicate condition of the sheet at this point, tive rather than remedial. it is necessary tokeep the roll very light, and In recent years both the size and the speed also very rigid. Any slight variation in theopof paper machines have been considerably ineration of the roll will cause a defective sheet. creased. In keeping with-this both the length 7 20 Slight distortions of the roll result in serious deand the speed of rotation of the dandyrolls has fects in the resultant product and require the been increased. In order to attain the proper replacement of theroll. At the present time, the rigidity and strength of roll it has been necesaverage lifeof the roll on large highspeed masary to go to dandy rolls of considerably larger chines is usually not more than a year to a year diameter. It has been found that, due to the .25 and one-half. The rolls are expensive to manugreater curvature of thelarger rolls, there is a faeture and this regular replacement represents greater tendency for the water to follow the a serious loss to the papermanufacturer. surface of the roll. This is doubtless due to The dandy rolls now customarilyemployed upon the difference in angle at which the roll leaves paper makingmachines areformed of 'anetwork the sheet. It has, therefore, become necessary to or lattice of brass rods, ribbons, or wires, soldered increase the efliciency of the showersin order to '85 together at frequent intervals andxover-laid with breakdown the film of water and prevent the acover of fine mesh ,wirecloth. .Eachend of the water from following the roll. A steam shower roll is provided with a head of heavy section metal is most generally used for this purpose and when having a trunnion axially positioned withrespect positioned t e t advantage inside of the 011 35 to the roll for rotatably supporting the roll in the temperature is such as to ,soften the solder suitable bearings. At least one trunnion is proused in securing the roll together, thereby weakvidedwith an opening toreceive a pipe connected ening its structure and causing'it to become easily to a steam or air shower withintheroll. The purdistorted. pose of this shower is to drive the water out of the Thus there are three very serious objections to 40 interstices of the wirecloth cover and prevent the dandy rolls as they are now customarily manuwater from following the roll. If the water is factured. The rolls are soldered together and allowed to'follow the outside surfaceit makes a this solder becomes softened by the steam diwater mark in the sheet of paper being formed. rected against the surface of the roll for the pur- In order to bring this shower'n'earer to the .sur- D 58 of preventing the Water from following the 45 face of the roll than the longitudinal axis thereroll. This soweakens the metal joints that the of the pipe upon which the shower is supported roll is easily distorted and also prevents the admust be bent downward through an angle of vantageoususe of steam of higher temperature. 90 or thereabouts. A serious objection to this A second objection is that the dandy rolls must constructionis that when steam is used thisprobe made of large diameter in order to be sum- 50 vldes a trap in which any condensed water is ciently strong and rigid to withstand the torcaught and carried outward by'the steam against sicn'al stresses to which they are subjected. This the surface of the roll thereby supplying a cerincrease in size of the roll increases the tendency tain quantity of water to theroll whereby a water of the water to follow the roll and increases the marked sheet will result. difficulty of preventing this phenomena. A third 55 In'theprior art a second steam or-air shower objection is that the rolls are supported upon-J10 trunnions axially positioned at their ends and are driven by contact of the roll with the sheet. This means that they are driven from the lattice work in which the solder is already softened by the high temperature of the steam, and are held at their ends. At best, there is a certain amount of friction at the trunnions, and quite often some condition arises in which there is unusual resistance to the rotation of one of the trunnions, such for example, as the binding of the steam pipe and trunnion, whereby the roll becomes badly distorted.

Various attempts have been made during a long period of years to remedy these conditions but until the present invention, no satisfactory solution has been found. In solving the problem it has been necessary to make sweeping and revolutionary changes in the dandy roll and its construction to produce a structure having all of the characteristics desired of such a roll. It has been necessary to employ a metal having considerably greater modulus of elasticity and strength than that previously employed. It has been necessary to employ metal substantially corrosion resistant under the conditions of use. It has also been necessary to devise improved means for driving or rotating the roll.

One of the principal objects of my invention is the provision of a dandy roll having a lattice of high strength corrosion resistant material wherein the metal of the frame is welded together at the lattice intersections.

Another object of the invention'is the provision of a dandy roll having improved means for supporting the roll and for raising the roll from the sheet. 7

Another object of the invention is the provision of means for driving a dandy roll.

Other objects and attendant advantages will become apparent to those skilled in the art from the following description and the accompanying drawings in which Figure 1 is a side elevation of the dandy roll and support showing one of the table rolls and means for'supporting the table roll;

Fig. 2 is an end elevation of a dandy roll and dandy roll support;

Fig. 3 is a fragmentary view partly in section showing the manner in which the dandy roll is constructed;

Fig. 4 is a vertical section on the line 44 of Fi 1; and

Fig. 5 is a diagrammatic view illustrating the effect of the dandy roll diameter upon the tendency for the water to follow the surface of the roll.

The present invention contemplates a dandy roll of smaller diameter than would normally be used in the prior art, considering the size and speed of the machine, the frame being fabricated of stainless steel or similar corrosion resistant metal of high physical properties, and the intersections of the metal of the frame being connected together by means of welding. Any of the well known methods may be employed in manufacturing a roll of this character. Customarily the ends of the roll are formed of comparatively heavy section metal and joined by a truss forming part of a lattice of wires brought into contact at frequent intervals the truss wires being connected together at the points of contact in order to make the roll rigid. Various arrangements of the wire are employed by different manufacturers to form the lattice and, doubtless, any one of these may be satisfactorily used.

The primary requisites of this lattice are that it be rigid, light in weight, and open in structure.

The invention further contemplates means for supporting the roll at the periphery near each end so that the end of the roll is open to permit 0 the positioning of a spray or sprays advantageously therein.

Referring first to Figs. 1 and 2. the numerals 7 and 8 designate a pair of standards supported upon opposite sides of the paper machine wire 9 upon legs 11 and 12 between suction boxes 10 and 10a. The upper ends of the legs have sockets 13 and 14 to receive the lower ends of the standards. Brackets 16 and 17 are connected to the upper ends of the standards 7 and 8 by means of sleeves 18 and 19 and extend along the sides of the wire 9 in the same direction. Sleeves 21 and 22 are positioned on the standards '7 and 8 intermediate the ends thereof and serve to support pulleys '23 which extend inward from the standard to points near opposite sides of the wire 9. Arms 24 and 25 are rotatably supported at one end upon the sleeves 18 and 19 adjacent to the standards '7 and 8 and extend in a direction slightly above and parallel to the brackets 16 and 17. The outer ends 26 and 27 of the arms 24 and 25 pass through substantially a right angle and extend downward to rotatably support pulleys 28 and 29 in substantially the same horizontal plane as the pulleys 23 but spaced therefrom in the direction of travel of the wire 9. Openings 31 are provided in enlarged portions 32 I of the arms 24 and 25 and serve to slidably support blocks 33 and 34. Springs 35 are positioned within the openings 31 and act between the blocks 33 and 34 and heads 36 supported upon adjusting screws 37 and 38. The blocks 33 and 34 support the arms 24 and 25 upon eccentric cams 39 and 41, positioned upon a shaft 42 extending between the outer ends of the brackets 16 and 17 and serving to hold the same in spaced relation, the position of the earns 39 and 41 normally determining the elevational position of the pulleys 28 and 29. A handle 43 is fixedly secured to one end of the shaft 42. Rotation of the handle 43 serves to rotate the eccentric cams 39 and 41 and thereby either raise or lower the outer ends of the arms 24 and 25 and the pulleys 28 and 29 for the purpose of lifting the dandy roll from the sheet on the wire 9 as will presently be described. The normal operating position of the pulleys 28 and 29 is varied through rotation of the screws 3'7 and 38, the pulleys being raised when the screws are turned into the portions 32 and lowered when the screws are turned out of these portions.

A table roll designated generally by the numeral 44 is positioned beneath the Wire 9 and serves to support the wire. The roll 44 is rotatably supported by means of bearings 45 and 46 rotatably receiving trunnions 4'7 and 48 which are fixedly secured to the roll 44. Blocks 49 and 51 support the bearings 45 and 46 at a desired elevation. The wire 9 of the paper machine rests upon the roll 44 and through its movement serves to rotate the latter. Belts 52 and 53 of suitable design are trained over opposite ends of the roll 44, the belt 52 being also trained over one of the pulleys 23 and over the pulley 28 and the belt 53 being trained over the spaced pulleys 23 and 29.

The spaced pulleys and the belts serve to provide a sling to support opposite ends of a dandy roll designated generally by 54 which is provided at opposite ends with end sections 55 and 56 of comparatively heavy section metal. Circumferential grooves 57 and58 are formed in the end sections 55 and 56 to receive the belts 52 and 53 as shown in Figs. 1- and'2. v

It will be seen that upon rotation of the table roll 44 the belts 52 and 53 willbe. driven and will rotate the dandy roll 54 at substantially the same speed. It will further be seen that the dandy roll may be almost entirely supported upon the belts '52 and 53 and only have suincicntcontact with the sheet lying upon the wire 9 to perform its necessary functions. The pulleys 23 and 26 and the pulleys 23 and 29 areso spaced with respect to each other as to bear against theperiphery of the end portions 55 and 56, respectively, thereby preventing lateral movement of the ends of the roll to prevent wabbling of the roll during its rotation. When it is necessary to lift the roll 64 from the sheet on the wire 9 the crank '43 is rotated whereby the pulleys 28 and 29 are lifted, thereby. tightening thebelt and lifting the roll from the sheet.

Brackets 59 and 61 are positioned upon the upper sides of the bearings 45 and '46 and serve to support yokes 62 and 63 which are adjustably secured thereon by means of bolts 64. A steam shower pipe 65 is positioned within the yokes 62 and '63 and passes through the inside of the dandy roll from end to end, one end thereof being provided witha cap 66. Yokes 62 and 63 permit the shower pipe 65'-to be convenien-tly removed from the dandy roll as will be apparent.

Referring now to Fig. 3, the dandy roll consists of a frame ofcomparatively heavy section circular end portions 55 and 56, which may advantageously be made of stainless steel or other high strength corrosion resistant metal, connected by a truss forming part of alattic'e designated generally by the numeral 67. The truss consists of two layers ofwire of stainless steel or other high strength corrosion .resistant metal fabricated into a cylindrical roll. The first layer is formed of a series of wires 68 having a general circumferential direction but curved from side to side as shown in Fig. 3, succeeding loops being brought into contact at various points about the circumference of the roll as shown at 69. The wires 68 are welded together by any suitable welding method at these points of contact, so as to produce a rigid frame-work. The next layer is formed by longitudinal wires 71 circumferentially spaced upon the frame-work formed by the wires 68. These wires are welded to the wires 68 at each point of contact throughout the entire length of the roll. I r

A third layer of wires is formed" over the truss wires 68 and 71 from circumferential wires '72 longitudinally spaced upon the wires 71, the three layers of wires forming anetwork or lattice. These may, or may not be welded at each point'of intersection with the wires '71, dependingupon the desire of the manufacturer.

It is" common, however, to mill or grind a series of slots or depressions in thelongitudinal wires 71 in the form of a helix to receive the wires '72, which may advantageously consist of a single wire wound tightly in the slots from end to end of the truss. The slots hold thewires 72 in position and prevent longitudinal movement thereof. This construction eliminates soldering or welding the wires '72 to the truss, though they may be welded ii. desired. The

cover '73 consisting of'wire mesh cloth similar in texture to the wire 9, is then tightly stretched over the wires 72 and the ends thereoffastened designated by the numeral '74. Referring also toFig. 5, it will be seen that the water tends to follow the surface of the dandy roll as the lat ter moves along the sheet. This difliculty in-' creases as the diameter of the dandy roll increases-and as the speed of rotation thereof increases. Therefore, inorder to prevent this phenomenon the shower pipe 65, previously described, is inserted inthe dandy roll and provided with sprays '75 to permit-the escape of steamor air from the'pipe. A baiile 76 is positioned to deflect the gas emerging from the sprays 75 against the inside of the roll along the line at'which the roll leaves the sheet. The spread of theshower may advantageously extend ashort distance each side of this line. The baffle 76; is provided with a groove 77 adapted to engage a projection. '78 on the pipe 65 so that the baflie may be removed by sliding the same endwise along the pipe until the groove 77 dis engages the projection '18. While other types of showers may be employed, that shown in the accompanying drawings is deemed preferable, a more complete description of which may be found the water back into the sheet and away from the surface of the roll.

Because of the manner in which the roll is supported, which permits the ends of the roll to be open, the pipe 65 may be placed at a point relatively close to the circumference of the roll so that the heat of the gas may be concentrated at the desired point on the surface of the roll, and the mechanical energy of the moving gas utilized to a maximum extent. Furthermore, it will be seen that since the metal intersections of the lattice are welded the steam employed for the sprays may be brought to any desired temperature without danger of so weakening the roll that distortion thereof will result. Furthermore, the shower pipe may be made of considerably larger diameter in order to accommodate a greater amount of steam without, in any way, increasing the diificulty of rotating the rollas has heretofore been necessary. In other words, since the shower pipe does not pass through the roll supporting means, the element of friction between these members, is not a factor.

By my invention the dandy rolls may be made considerably smaller in diameter and of lighter Even when rolls are made of the same size and cross-section of metal, those made according to my invention will have substantially less weight, since brass or bronze weighs about .31

less per cubic inch, while stainless steel weighs about .28 pounds per cubic inch. In addition to the diiferencewjidpe to the difference in weight of the metal, there is the weight of the solder to be considered.

My invention further eliminates the troubles resulting from the use of solder for connecting the various portions of the lattice. superheated steam at any temperature may be employed without danger of weakening the joints between the metal and substantially no chemical body will react with the welded portion which does not at the same time effect the entire roll.

The provision of welded joints not only eliminates the use of solder but results in joints of much greater strength and rigidity than could possibly be obtained by soldering. Numerous attempts have been made to weld brass, bronze and the like for this purpose but no satisfactory results have ever been obtained.

My improved manner of mounting the dandy roll proper serves to substantially eliminate all torsional strain'on the lattice of the roll, since the roll is driven at substantially the same peripheral speed as the sheet with which the roll comes in contact.

The invention, because of the use of metal of.

high modulus of elasticity and because of welding of the points of contact of the truss, prevents the so-called whipping or jumping of the roll. This is a phenomenon which results from the development of wider and higher speed machines. In other words, when the dandy rolls are employed on wide high speed machines, there is a pronounced tendency for the cylinder of the roll to whip, thereby resulting in an uneven sheet andin excessive wear on the wire of the machine/which naturally results from the roll pressing more on? one part of the wire than on another. Because of the high modulus of elasticity of the metal, the deflection customary in this type of rolls is substantially eliminated.

A further decided advantage of the present construction lies in the fact that it permits of the utilization of an open end roll without having it become egg shaped or flattened after a short period of use. It has heretofore been impractical to utilize an open end rollbecause of the fact that this change in shape occurred. In other words, it has heretofore been necessary to provide a spider or other stiffening means on the ends of the roll in order to prevent this change in shape in as far as possible. The present invention permits the practical utilization of such a construction.

While I have illustrated a specific embodiment of my invention I am aware that numerous a1- terations and changes may be made therein without departing from the spirit of the invention and the scope of the appended claims in Which I claim:

1. In a paper making machine having a wire, a dandy roll, means for rotatably supporting said roll at the periphery near each end thereof, and means for driving said roll at a peripheral speed substantially equal to the linear speed of said wire.

2. In a paper making machine, a dandy roll adapted to engage the surface of a sheet being formed, an endless belt at each end of said roll adapted to form a sling to support the ends .of said roll, means for preventing lateral movement of the ends of said roll, and means for driving said belts to rotate said roll.

3. In a paper making machine, a dandy roll adapted to engage the surface of a sheet being formed, an endless belt at each end of said roll adapted to form a sling to support the ends of said roll, means for preventing lateral movement of the ends of said roll, means for lifting said roll from said sheet, and means for driving said belts to rotate said roll.

4. In a paper making machine, an open end dandy roll adapted to engage the surface of a sheetbeing formed, means for rotatably supporting the roll at the periphery thereof near each end, a stationary spray pipe in said roll positioned to direct a spray of gas through said roll along the line at which the latter leaves the sheet.

5. In a paper making machine, an open end dandy roll adapted to engage the upper surface of a sheet being formed, a roll below said sheets and driven therewith, spaced pulleys above said sheet at each side thereof and endless belts trained over said lower roll and over said pulleys adapted to support the ends of said dandy roll between said spaced pulleys, the pulleys at each end being spaced to bear against opposite sides of said dandy roll to prevent lateral movement of said end, and said belt serving to drive said dandy roll.

6. In a paper making machine, an open end dandy roll adapted to engage the upper surface of a sheet being formed, a roll below said sheets and driven therewith, spaced pulleys above said sheet at each side thereof and endless belts trained over said lower roll and over said pulleys adapted to support the ends of said dandy roll between said spaced pulleys, the pulleys at each end being spaced to bear against opposite sides of said dandy roll to prevent lateral movement of said end, and said belt serving to drive said dandy roll, and means for raising said dandy roll from said sheet.

7. In a paper making machine, an open end dandy roll adapted to engage the upper surface of a sheet being formed, means for rotatably supporting said rolls comprising an upright member at each side of said sheet, a pulley on each of said uprights, a pulley spaced from each of said pulleys, an arm rotatably supported near each upright each arranged to support one of said second pulleys in spaced relation to said first mentioned pulleys, resilient means for maintaining said arms in desired positions, a roll positioned beneath said sheet, endless belts trained over the pulleys at each side of said sheet and over said lower roll, adapted to support the ends of said dandy roll between said spaced pulleys, and means for raising and lowering said arms to raise and lower said dandy roll, said lower roll being driven with said sheet and serving to drive said dandy roll.

8. In a paper making machine, an open end dandy roll adapted to engage the surface ofqa sheet being formed, means for rotatably support ing the roll at the periphery thereof near each end, a stationary spray pipe entering said roll near the periphery thereof and positioned in close proximity to the inner surface of the roll substantially along the line at which the roll leaves the sheet to direct a spray of gas through said roll along the line at which the latter leaves the sheet.

EARL E. BERRY.

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