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US 4,768,050 AGranted
Pressure development apparatus for imaging sheets employing photosensitive microcapsules
AssigneeThe Mead Corporation
InventorJack Beery
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AssigneeThe Mead Corporation
InventorJack Beery
Estimating the term…
A two-roll type pressure developer apparatus provides for the pressure development of a latent image formed on sheet material, and includes a first hollow pressure roll mounted on a support shaft which extends axially through the first roll and is in pressure-engagement to define a high pressure nip with a second roll. The support shaft forms a loading shaft through which the hollow or first roll is center-loaded. The rolls are carried in a support frame with the second roller being journalled in the frame, and the first roller being journalled on radius arms through non-self-aligning bearings on the arm ends. The arms in turn are mounted on bosses through self-aligning bearings. Loading springs apply a loading force directly to the loading shaft through the arms and journals so that the self-aligning bearings permit the arms to deflect during the shaft loading while the loading forces are carried by the non-self-aligning bearings. A working zone is established throughout which the nip pressure remains substantially uniform between the rolls, which working zone is somewhat less than the total width of the rolls, and pressure is relieved at the regions axially outwardly of the zones by an annular internal relief formed in the first roll in one embodiment and in the second roll in another embodiment.
In a roll-type pressure developer in which an image on sheet material is developed by passing the sheet material between the nip of first and second cylindrical pressure rolls to exert a high localized pressure on the sheet material across a zone corresponding to the width of said material and in which the pressure rolls have a length which exceeds the width of said zone, the improvement for the uniform loading of the pressure rolls, comprising:
A two-roll pressure developer for applying a uniform pressure to paper stock across a nip, in which the width of the rolls excees the width of paper stock to be developed therebetween, comprising:
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 frame means, comprising:
Dependencies are inferred from the claim text.