US3424651A - Table roll mounting - Google Patents

Table roll mounting Download PDF

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Publication number
US3424651A
US3424651A US500631A US3424651DA US3424651A US 3424651 A US3424651 A US 3424651A US 500631 A US500631 A US 500631A US 3424651D A US3424651D A US 3424651DA US 3424651 A US3424651 A US 3424651A
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United States
Prior art keywords
roll
shaft
roll shell
shell
supporting
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Expired - Lifetime
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US500631A
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English (en)
Inventor
Donald B De Nover
Loyal H Hess
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Beloit Corp
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Beloit Corp
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/36—Guiding mechanisms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
    • F16C13/02—Bearings
    • F16C13/022—Bearings supporting a hollow roll mantle rotating with respect to a yoke or axle
    • F16C13/024—Bearings supporting a hollow roll mantle rotating with respect to a yoke or axle adjustable for positioning, e.g. radial movable bearings for controlling the deflection along the length of the roll mantle

Definitions

  • a table roll assembly for a Fourdrinier wire having an outer cylindrical roll shell for supporting a load along its axial length, an inner solid shell supporting shaft means extending through the shell adapted to be non-rotatably mounted at its ends, end bearing means between the shaft and the roll shell for rotatably supporting the ends of the roll shell, and intermediate rotatable bearings mounted between the end bearings and positioned between the shaft and the intermediate surface of the roll shell with the end bearing and the intermediate rotatable bearings being eccentric relative to each other an amount which supports the roll shell so that its outer surface remains substantially axially straight and the internal shaft bends due to the forces on the roll shell.
  • the present invention relates to improvements in roll assemblies and more particularly to an improved table ro l for a paper machine with a support which is capable of holding the roll substantially axially straight for a given condition.
  • the invention is particularly advantageous and well-adapted for use in paper making machines and especially for a table roll which provides a dewatering support beneath a Fourdrinier wire.
  • a table roll which provides a dewatering support beneath a Fourdrinier wire.
  • the water suspension of pulp is deposited on a traveling Fourdrinier wire and the pulp is dewatered to form a web with the web subsequently being removed from the wire to be pressed and further dried. It is important to the satisfactory operation of the machine and to the formation of a good paper web that the table roll beneath the wire be maintained substantially straight to provide a horizontal planar support for the wire.
  • the table rolls are frequently used which extend across the machine beneath the Fourdrinier wire and have an effect well known to those versed in the art which draws water from the web through the wire on the off-running side of the roll.
  • the weight of the wire and the web with water tend to cause a sag of the table roll in a vertical direction.
  • the forces caused by the reaction between the roll surface and the wire including the frictional force of the wire driving the roll, the pressure differential between the upper surface of the web in the zone of the off-running side of the table ro l, and the water striking the roll cause deflection of the roll in the machine direction, or in other words, in the direction of wire travel. This is particularly true near the breast roll where a large volume of water is removed.
  • Deflection must be minimized but cannot be avoided. It is desirable that the deflection of the table roll match other components such as the breast roll, forming board, deflectors, etc. It is also desired that the deflection can be changed or controlled so as to match other components.
  • the diameter of the roll needs to be increased to minimize deflection and to provide a roll which will not whip at high speed.
  • These large rolls are not the optimum for formation and it is an object of the invention to reduce the diameter, control the deflection to a minimum and to provide a roll of small diameter which will not whip at high speed.
  • a further object of the invention is to provide a substantially axially straight table roll assembly which utilizes a solid supporting shaft extending through the center of the table roll and avoids the disadvantages used in arrangements heretofore available.
  • a stil further object of the invention is to provide an improved table roll assembly which eliminates or decreases deflection caused by the weight of the roll assembly and by external loads such as wire sag load, water load, and other forces, wherein wire wear usually caused by increased tension on the edges due to wire sag is avoided, and wherein disadvantageous drainage and resultant improper web formation are avoided.
  • the invention embodies a supporting roll assembly having a substantially cylindrical outer surface for supporting a load along its axial length, such as the type used for a table roll in a Fourdrinier machine, including a roll shell for positioning across a paper machine beneath a Fourdrinier wire, a horizontal solid internal shell supporting shaft extending through the roll shell and adapted to be nonrotatably mounted at its ends, end bearings between the shaft and the roll shell for rotatably supporting the ends of the roll shell, and intermediate bearings positioned between the end bearings and located between the shaft and the internal surface of the roll shell with the end bearings and intermediate bearings being eccentric relative to each other an amount which supports the roll shell with its outer surface substantially axially straight as the internal shaft bends due to forces on the roll shell.
  • FIGURE 1 is a schematic showing of a section taken through a roll shell assembly embodying the principles of the present invention
  • FIGURE 2 is a fragmentary schematic showing of a portion of a Fourdrinier section of a paper machine illustrating the location of table rolls;
  • FIGURES 3 and 4 are schematic showings of bearing arrangements in accordance with the principles of the invention.
  • FIGURE 5 is a more detailed vertical sectional view taken through a roll shell assembly showing certain structural details of an operable structure embodying the invention.
  • FIGURE 6 is a vertical sectional view taken substantially along the line VIVI of FIGURE 5.
  • the table roll assembly shown includes an outer roll shell 10 which is of a length so that it is slightly longer than the width of a Fourdrinier wire to be supported on the roll shell.
  • the shell has a smooth cylindrical outer surface and is of a diameter which provides optimum dewatering without disadvantageous effects to the web being formed and dewatered on the wire.
  • Support for the roll shell is afforded by a solid central shaft means 11 which extends through the roll shell and is adapted to be supported at its ends by supports 12 and 13.
  • the Fourdrinier assembly has suitable members on the framework for supporting the shaft 11 in a nonrotatable manner.
  • Rotatably supporting the roll shell 10 on the nonrotat-able shaft 11 are end bearings 14 and 15, and an intermediate bearing 16 therebetween.
  • the intermediate bearing 16 is eccentric relative to the end bearings 14 and an amount so that as the shaft 11 bends during operation due to the load on the roll shell the roll shell will be held substantially axially straight. That is, a straight support will be provided holding the Fourdrinier wire horizontal.
  • FIGURE 2 illustrates a typical Fourdrinier section with a. traveling Fourdrinier wire 19 being supported horizontally so that a pulp suspension is discharged onto it from a headbox 20.
  • the wire is supported by breast roll 21 and a couch roll, not shown, and the pulp suspension on the wire forms a Web W and passes over the dewatering mechanism such as a series of table rolls 22 and a suction box 23.
  • the formed web is taken off of the wire following the couch roll and passed through presses and a subse quent drier section and is wound on a roll.
  • the eccentricity of the bearings may be arranged in different ways each designed to obtain a substantially straight roll shell when the structure is operating under load.
  • the axis or centerline of the roll shell is shown at 24 with the axis or centerline of the non-rotatable solid shaft at 25. End supports 26 and 27 are provided.
  • the end bearings 28 and 29 are non-eccentric relative to the axis of the shaft and intermediate bearing 30 is eccentric. The deflection of the axis of the shaft is emphasized with the line at 30 showing the eccentricity of the intermediate hearing.
  • the axis of the roll shell is shown at 24 and the axis of the solid non-rotatable shaft is shown at In this arrangement, an intermediate bearing is provided which is concentric with the shaft and end bearings 28 and 29 are eccentric by an amount so that with deflection of the shaft due to load, the roll shell will remain substantially straight.
  • the end supports 26' and 27 for the shaft in FIGURE 4 and the end supports 26 and 27 for the shaft in FIGURE 3 are vertically adjustable so that the roll shell can be brought up and trued to the proper height and level relative to the rest of the wire.
  • the bearings will either be replaceable with bearings of other eccentricities or will be adjustable so that under different environments, different eccentricities may be obtained to obtain a substantially straight roll shell.
  • the conditions of FIGURES 3 and 4 are under load and it will be appreciated that under no load conditions, the axis of the roll shell will assume some position different than that shown in the drawings at which the actual deflection forces of the roll shell and shaft are at equilibrium.
  • the structures are designed, however, with the shaft in its natural unloaded condition independent from the roll shell being straight.
  • the roll shell is also constructed so that its natural unloaded condition is straight.
  • FIGURE 5 shows an operating assemblage with the roll shell 31 provided with an outer covering 32 thereon.
  • a central shaft 33 Extending through the roll shell is a central shaft 33. While the shaft illustrated is shown hollow for convenience because of its size, in accordance with the principles of the present invention, it is unnecessary to provide a hollow shaft and the central shaft can be solid. In other words, the central shaft does not have to be hollow to provide passageways for supports or mechanism for controlling the shape or deflection of the central shaft so that it need only be of a size adequate so that it will not have excessive deflection with load to cause permanent distortion.
  • the outer diameter of the roll shell is chosen to conform with the dictates of optimum performance relative to dewatering the web on the wire.
  • the shaft 33 is carried on end supports 34 and 35 on the machine. Inasmuch as each end support is the same, only the structural details of end support 35 need be provided and the end supports have a jacking bolt 36 for moving them up or down to true them relative to the wire position.
  • the shaft is carried in a self-aligning support 37 permitting unrestricted deflection of the shaft 33.
  • End plate 38 supports a lubrication line 39 leading to the intermediate or central bearing 42.
  • the roll shell is supported on the shaft 33 by the intermediate bearing 42 and end bearings 40 and 41.
  • the central bearing is concentric with the shaft and the end bearings are eccentric.
  • Suitable lubrication passages 42 and 43 are provided for the end bearings 40 and 41.
  • the end bearing 41 is adjustable as to the location of eccentricity with an index line 44 indicating the location of maximum eccentricity.
  • the bearing is set so that the center line 46 of the roll shell 31 is offset both vertically and horizontally from the centerline 45 of the shaft 33.
  • the eccentricity of the axis 46 of the roll shell forms an angle A relative to the axis 45 of the shaft 33.
  • the vertical eccentricity is shown as a distance C and the horizontal eccentricity is shown as a distance B.
  • the shaft will deflect an amount vertically equal to the distance C.
  • the eccentricities on the shaft are adjusted so that the distance B is the same at the center and ends which permits the bearing centers to lie on a horizontal straight line in a vertical plane when the desired vertical deflection C takes place.
  • the shaft 33 has radially offset or eccentric ends 33a. These ends support eccentric bushings 40a which carry the end bearings 40 and which are shaped so that the end bearings 40 are eccentric relative to the intermediate bearing 42.
  • the direction of eccentricity (the relative positions of the centers of the relatively eccentric end bearings 40 and intermediate bearing 42) is adjustable, as described above in connection with FIGURE 6 by either rotating the entire shaft 33 or rotating the eccentric end bushings 40a relative to the shaft 33.
  • end bearings and intermediate bearings are chosen to support the roll shell 31 on the central shaft 33 and are eccentric relative to each other.
  • Either the intermediate bearing or the end hearings (or a combination of both) may be chosen to be eccentric relative to the shaft and the eccentricity is predetermined to be an amount which will permit free deflection of the shaft due to the load on the roll shell and maintain the roll shell axially straight.
  • the structure obtains advantages over devices heretofore available in the prior art and permits obtaining a table roll of optimum size without resorting to prebo'wing the shaft or introducing a counter couple to straighten the shaft and roll body.
  • the structure can be constructed in a relatively inexpensive and simple manner and permits operation without frequent adjustment and servicing or repair.
  • a table roll for providing a de-watering support for a Fourdrinier wire comprising, a roll shell positioned across a paper machine beneath a Fourdrinier wire, a shell support shaft means extending through said roll shell and adapted to be non-rotatably mounted, end bearing means between the shaft means and the roll shell rotatably supporting the roll shell, and intermediate rotatable bearing means between the shaft means and the internal surface of the roll shell and located between the end bearing means for rotatably supporting the roll shell, said intermediate rotatable bearing means being eccentric with respect to said end bearing means for supporting the shaft means with the roll shell having a substantially straight axis and the shaft means bending due to the force on the roll shell.
  • a table roll for providing a de-watering support for a Fourdrinier Wire comprising, a roll shell positioned beneath a Fourdrinier wire, a horizontal shell supporting shaft means extending through said roll shell and adapted to be non-rotatably mounted, end bearing means between the shaft means and the roll shell rotatably supporting the roll shell, and intermediate rotatable bearing means between the shaft means and the internal surface of the roll shell and between the end bearing means for rotatably supporting the roll shell, said intermediate rotatable bearing means being vertically eccentric with respect to said end bearing means for supporting the shaft means with the roll shell having a substantially straight axis and the shaft means bending due to forces on the roll shell.
  • a supporting roll assembly having a substantially cylindrical outer surface for supporting a load along its axial length such as a traveling web comprising, a roll shell having an outer substantially cylindrical supporting surface, a horizontal shell-supporting shaft means extending through said roll shell and adapted to be non-rotatably mounted, end bearing means between the shaft means and the roll shell for rotatably supporting the roll shell, and intermediate rotatable bearing means between the shaft means and the internal surface of the roll shell and between said end bearing means for rotatably supporting the roll shell, said intermediate rotatable bearing means being eccentric with respect to said end bearing means for supporting the roll shell substantially axially straight as the shaft means bends with the forces on the roll shell.
  • a table roll for providing a de-Watering support for a Fourdrinier wire comprising a roll shell positioned beneath a Fourdrinier wire, a shell supporting shaft means extending through said roll shell and adapted to be nonrotatably mounted, said shaft means being axially straight when free of load, end bearing means between the shaft means and the roll shell rotatably supporting the roll shell, and intermediate rotatable bearing means between the shaft means and the internal surface of the roll shell and between the end bearing means for rotatably supporting the roll shell, said intermediate rotatable bearing means being eccentric with respect to said end bearing means for supporting the shaft means with the roll shell having a substantially straight-axis and the shaft means bending due to force on the roll shell.
  • a table roll for providing a de-watering support for a Fourdrinier wire comprising, a roll shell positioned beneath a Fourdrinier wire, a shell supporting shaft means extending through said roll shell and adapted to be non-rotatably mounted, en d bearing means between the shaft means and the roll shell rotatably supporting the roll shell, and intermediate rotatable bearing means between the shaft means and the internal surface of the roll shell and between the end bearing means for rotatably supporting the roll shell, said intermediate rotatable hearing means and said end means being eccentric relative to each other in amounts that the shaft means bows with loads and the roll shell is held substantially straight in an axial direction.
  • a table roll for providing a de-watering support for a Fourdrinier wire comprising, a roll shell positioned beneath a Fourdrinier wire, a shell-supporting shaft means extending through said roll shell and adapted to be nonrotatably mounted, end bearing means between the shaft means and the roll shell rotatably supporting the roll shell, and intermediate rotatable bearing means between the shaft means and the internal surface of the roll shell and between the end bearing means for rotatably supporting the roll shell, said end bearing means being concentric with the shaft and said intermediate rotatable bearing means being eccentric relative to the shaft axis so that the shaft bends with the load and the roll shell remains substantially axially straight.
  • a table roll for providing a de-watering support for a Fourdrinier wire comprising, a roll shell positioned across a paper machine beneath a Fourdrinier wire, a shell-supporting shaft means extending through said roll shell and adapted to be non-rotatably mounted, end bearing means between the shaft means and the internal surface of the rod shell and between the end bearing means for rotatably supporting the roll shell, and intermediate rotatable bearing means between the shaft means and the internal surface of the roll shell and between the end bearing means for rotatably supporting the roll shell, said intermediate rotatable bearing means being concentric with respect to said shaft and said end bearing means being eccentric relative to the shaft axis so that the shaft means bends with the load and the roll shell remains substantially axially straight.
  • a table roll for providing a de-watering support for a Fourdrinier wire comprising, a roll shell positioned beneath the Fourdrinier wire, a shell-supporting shaft means extending through said roll shell and adapted to be non-rotatably mounte'd, rotary end bearing means mounted beneath said shaft means and said roll shell rotatably supporting said roll shell, and rotary intermediate bearing means mounted between between said shaft means and the internal surface of said roll shell and between said rotary end bearing means for rotatably supporting said roll shell, said rotary intermediate bearing means being eccentric with respect to said end rotary bearing means for supporting said shaft means with said roll shell having a substantially straight axis and the 7 8 shaft means bending due to force on said roll shell, said References Cited shaft means being substantially axially straight when free UNITED STATES PATENTS of load, said shaft means and roll shell having non-parallel axes, said rotary bearings between said shaft means and 1868860 7/1932 Von 1'' 19337 roll shell being non-concentric relative to each other

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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US500631A 1965-10-22 1965-10-22 Table roll mounting Expired - Lifetime US3424651A (en)

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US50063165A 1965-10-22 1965-10-22

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ES (1) ES327495A1 (es)
FR (1) FR1504751A (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3676909A (en) * 1969-06-04 1972-07-18 Ahlstroem Oy Roller
US4577815A (en) * 1979-11-26 1986-03-25 Paul Orazi Wing assemblies for aircraft

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1868860A (en) * 1927-12-08 1932-07-26 American Bicheroux Company Roller conveyer for glass plates

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1868860A (en) * 1927-12-08 1932-07-26 American Bicheroux Company Roller conveyer for glass plates

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3676909A (en) * 1969-06-04 1972-07-18 Ahlstroem Oy Roller
US4577815A (en) * 1979-11-26 1986-03-25 Paul Orazi Wing assemblies for aircraft

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Publication number Publication date
FR1504751A (fr) 1967-12-08
DE1511201B2 (de) 1973-01-04
ES327495A1 (es) 1967-03-16
DE1511201A1 (de) 1969-09-04

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