Roll with width adjusting function

A rolling apparatus comprising:

• an arbor extending in an axial direction and rotatable about a rotation axis parallel to the axial direction;
• an adjustable sleeve roll comprising first and second sleeve rolls shrink-fitted over the arbor, the first sleeve roll being movable in the axial direction and including first threads formed on an axial end thereof;
• fluid loading means for loading a fluid under high pressure between the first sleeve roll and the arbor;
• a width-adjusting sleeve fitted over an axial end portion of the arbor, the width-adjusting sleeve being freely rotatable with respect to the arbor and including second threads threadedly engaged with the first threads of the first sleeve roll;
• a clutch mechanism for fixing the width-adjusting sleeve in a fixed position relative to the arbor when a roll width adjustment is performed by rotating the arbor to move the first sleeve roll axially along the arbor due to engagement of the first threads of the first sleeve roll with second threads of the width-adjusting sleeve;
• and
• a rotary joint, the rotary joint including a recessed portion in an axial end surface of the arbor, a shaft mounted in the recessed portion at a center thereof, a first hydraulic passageway inside the shaft, a second hydraulic passageway in the arbor and communicating with the first hydraulic passageway in the shaft, the second hydraulic passageway communicating with fluid loading means, a block mounted in the recessed portion of the arbor such that the arbor is rotatable with respect to the block, a third hydraulic passagway in the block and communicating with the first hydraulic passageway in the shaft, an annular gap between an inner surface of the block and an outer circumference of the shaft, and hermetic seal means in the annular gap for providing a hermetic seal between the shaft and the block when hydraulic fluid pressure is applied to the first, second and third hydraulic passageways. to