Pressure development roll for imaging sheets employing photosensitive microcapsules

Claim 2

A pressure roll comprising: a support shaft; a cylindrical roll body secured to said shaft, having a length and defining a center point on said roll body and first and second ends spaced equidistantly in opposite directions from said center point; said roll body being formed from a body material having a modular of elasticity which varies as a function of position along the length of said roll body; said body material being formed from graphite filaments woven to have a predetermined wrap angle, the modulus of elasticity of said body material being a function of said wrap angle.

Claim 3

The pressure roll as defined in claim 1, wherein said roll body is encased in a cylindrical shell.

Claim 4

The pressure roll as defined in claim 2, wherein said shell is formed from a hardened metallic material.

Claim 5

The pressure roll as defined in claim 1, wherein the modulus of elasticity of said body material varies from a minimum value at said first and second ends of said roll body to a maximum value at said center of said roll body.

Claim 6

A roll type pressure fixing and developing apparatus in which sheet material to be treated is passed through a high pressure nip defined by a pair of rolls carried in a frame means, comprising: a first roll and a second roll, each of said rolls including a support shaft; a cylindrical roll body secured to said shaft, having a length and defining a center point on said roll body and first and second ends spaced equidistantly in opposite directions from said center point; said roll body being formed from a body material having a modulus of elasticity which varies as a function of position along the length of said body; said body material being formed from graphite filaments woven to have a predetermined wrap angle, the modulus of elasticity of said body material being a function of said wrap angle; said frame means mounting said first roll for pressure engagement with said second roll for defining said nip; said frame means further including loading means for applying load to said shaft of said first roll.

Claim 7

A roll type pressure fixing and developing apparatus in which sheet material to be treated is passed through a high pressure nip defined by a pair of rolls carried in a frame means, comprising: a first roll and a second roll, each of said rolls including a support shaft; a cylindrical roll body secured to said shaft, having a length and defining a center point on said roll body and first and second ends spaced equidistantly in opposite directions from said center point; said roll body being formed from a body material having a modulus of elasticity which varies as a function of position along the length of said body; said body material being formed from graphite filaments woven to have a predetermined wrap angle, the modulus of elasticity of said body material being a function of said wrap angle; said frame means mounting said first roll for pressure engagement with said second roll for defining said nip; said frame means further including loading means for applying load to said shaft of said first roll.