Roll calendar system with different size hydrostatic supporting elements

Claim 1

A system of rolls for use in forming a nip in calenders and like machines, comprising a first roll including a carrier, a deformable hollow cylindrical shell rotatably surrounding said carrier, said shell having an internal surface and first and second end portions and being movable radially relative to the carrier, first supporting elements forming at least one first row and interposed between said carrier and said internal surface, said first supporting elements having first surfaces adjacent the internal surface of said shell, second supporting elements forming at least one second row and interposed between said carrier and said shell opposite said first supporting elements, said second supporting elements having second surfaces adjacent said internal surface, at least some of said second surfaces being smaller than said first surfaces, first pressure generating devices having hydraulic cylinder and piston units for urging said first supporting elements toward the internal surface of said shell, and second pressure generating devices having hydraulic cylinder and piston units for urging said second supporting elements toward the internal surface of said shell while said first supporting elements are urged toward the internal surface of the shell when the machine embodying the first roll is in use in forming said nip, each of said units including a piston member and a cylinder member, one of said members being connected with said carrier and the other of said members being connected with the respective supporting element; and a second roll defining with the first roll a nip adjacent the first supporting elements.

Claim 2

A system of rolls for use in forming a nip in calenders and like machines, comprising a first roll including a carrier, a deformable hollow cylindrical shell rotatably surrounding said carrier, said shell having an internal surface and first and second end portions and being movable radially relative to the carrier, first supporting elements forming at least one first row and interposed between said carrier and said internal surface, said first supporting elements having first surfaces adjacent the internal surface of said shell, second supporting elements forming at least one second row and interposed between said carrier and said shell opposite said first supporting elements, said second supporting elements having second surfaces adjacent said internal surface, at least some of said second surfaces being smaller than said first surfaces, first pressure generating devices having hydraulic cylinder and piston units for urging said first supporting elements toward the internal surface of said shell, and second pressure generating devices having hydraulic cylinder and piston units for urging said second supporting elements toward the internal surface of said shell while said first supporting elements are urged toward the internal surface of the shell when the machine embodying the first roll is in use in forming said nip, each of said units including a piston member and a cylinder member, one of said members being connected with said carrier and the other of said members being connected with the respective supporting element; and a second roll defining with the first roll a nip adjacent the first supporting elements.

Claim 10

A system of rolls for use in forming a nip in calenders and like machines, comprising a roll including a carrier; a deformable hollow cylindrical shell rotatably surrounding said carrier, said shell having an internal surface and first and second end portions and being movable radially relative to said carrier; first hydrostatic supporting elements forming at least one first row and interposed between said carrier and said internal surface, said first supporting elements having first surfaces adjacent the internal surface of said shell and provided with fluid-containing pockets; second hydrostatic supporting elements forming at least one second row and interposed between said carrier and said shell opposite said first supporting elements, said second supporting elements having second surfaces adjacent said internal surface and provided with fluid-containing pockets, at least some of said second surfaces being smaller than said first surfaces and the supporting elements of said second row being more distant from one another than the supporting elements of said first row; adjustable first and second pressure generating devices having first and second hydraulic cylinder and piston units for respectively urging said first and second supporting elements simultaneously toward said internal surface while the machine embodying the roll is in use in forming said nip, each of said units including a cylinder member and a piston member, one of said members being connected with said carrier and the other of said members being connected with the respective supporting element; and means for adjusting said pressure generating devices to thereby vary the force with which the respective supporting elements are urged toward said internal surface.

Claim 11

A system of rolls for use in forming a nip in calenders and like machines, comprising a roll including a carrier; a deformable hollow cylindrical shell rotatably surrounding said carrier, said shell having an internal surface and first and second end portions and being movable radially relative to said carrier; first hydrostatic supporting elements forming at least one first row and interposed between said carrier and said internal surface, said first supporting elements having first surfaces adjacent the internal surface of said shell and provided with fluid-containing pockets; second hydrostatic supporting elements forming at least one second row and interposed between said carrier and said shell opposite said first supporting elements, said second supporting elements having second surfaces adjacent said internal surface and provided with fluid-containing pockets, at least some of said second surfaces being smaller than said first surfaces and the supporting elements of said second row being more distant from one another than the supporting elements of said first row; adjustable first and second pressure generating devices having first and second hydraulic cylinder and piston units for respectively urging said first and second supporting elements simultaneously toward said internal surface while the machine embodying the roll is in use in forming said nip, each of said units including a cylinder member and a piston member, one of said members being connected with said carrier and the other of said members being connected with the respective supporting element; and means for adjusting said pressure generating devices to thereby vary the force with which the respective supporting elements are urged toward said internal surface.

Claim 12

A system of rolls for use in forming a nip in calenders and like machines, comprising a roll including a carrier; a deformable hollow cylindrical shell rotatably surrounding said carrier, said shell having an internal surface and first and second end portions and being movable radially relative to the carrier; first hydrostatic supporting elements forming at least one first row and interposed between said carrier and said internal surface, said first supporting elements having first surfaces adjacent the internal surface of said shell and provided with fluid-containing pockets; second hydrostatic supporting elements forming at least one second row and interposed between said carrier and said shell opposite said first supporting elements, said second supporting elements having second surfaces adjacent said internal surface and provided with fluid-containing pockets, at least some of said second surfaces being smaller than said first surfaces, the first supporting elements of said first row including two outermost elements each disposed at a first distance from the respective end portion of said shell and the second supporting elements of said second row including two outermost elements each disposed at a greater second distance from the respective end portion of said shell; and first and second pressure generating devices having first and second hydraulic cylinder and piston units for respectively urging said first and second supporting elements simultaneously toward said internal surface while the machine embodying the roll is in use in forming said nip, each of said units including a cylinder member and a piston member, one of said members being connected with said carrier and the other of said members being connected with the respective supporting element.

Claim 13

A system of rolls for use in forming a nip in calenders and like machines, comprising a roll including a carrier; a deformable hollow cylindrical shell rotatably surrounding said carrier, said shell having an internal surface and first and second end portions and being movable radially relative to the carrier; first hydrostatic supporting elements forming at least one first row and interposed between said carrier and said internal surface, said first supporting elements having first surfaces adjacent the internal surface of said shell and provided with fluid-containing pockets; second hydrostatic supporting elements forming at least one second row and interposed between said carrier and said shell opposite said first supporting elements, said second supporting elements having second surfaces adjacent said internal surface and provided with fluid-containing pockets, at least some of said second surfaces being smaller than said first surfaces, the first supporting elements of said first row including two outermost elements each disposed at a first distance from the respective end portion of said shell and the second supporting elements of said second row including two outermost elements each disposed at a greater second distance from the respective end portion of said shell; and first and second pressure generating devices having first and second hydraulic cylinder and piston units for respectively urging said first and second supporting elements simultaneously toward said internal surface while the machine embodying the roll is in use in forming said nip, each of said units including a cylinder member and a piston member, one of said members being connected with said carrier and the other of said members being connected with the respective supporting element.

Claim 14

A system of rolls for use in calenders and like machines, comprising a roll including a carrier; a deformable hollow cylindrical shell rotatably surrounding said carrier, said shell having an internal surface and first and second end portions and being movable radially relative to the carrier; first hydrostatic supporting elements forming at least one first row and interposed between said carrier and said internal surface, said first supporting elements having first surfaces adjacent the internal surface of said shell and provided with fluid-containing pockets; second hydrostatic supporting elements forming at least one second row and interposed between said carrier and said shell opposite said first supporting elements, said second supporting elements having second surfaces adjacent said internal surface and provided with fluid-containing pockets, at least some of said second surfaces being smaller than said first surfaces; a substantially annular support for each end portion of said shell, said supports surrounding said carrier within the respective end portions and being movable relative to said carrier radially of said shell; and means for arresting said supports in selected positions with reference to said carrier.

Claim 15

A system of rolls for use in calenders and like machines, comprising a roll including a carrier; a deformable hollow cylindrical shell rotatably surrounding said carrier, said shell having an internal surface and first and second end portions and being movable radially relative to the carrier; first hydrostatic supporting elements forming at least one first row and interposed between said carrier and said internal surface, said first supporting elements having first surfaces adjacent the internal surface of said shell and provided with fluid-containing pockets; second hydrostatic supporting elements forming at least one second row and interposed between said carrier and said shell opposite said first supporting elements, said second supporting elements having second surfaces adjacent said internal surface and provided with fluid-containing pockets, at least some of said second surfaces being smaller than said first surfaces; a substantially annular support for each end portion of said shell, said supports surrounding said carrier within the respective end portions and being movable relative to said carrier radially of said shell; and means for arresting said supports in selected positions with reference to said carrier.