Photocopying – Contact printing – Light boxes
Patent
1987-04-16
1988-08-30
Mathews, A. A.
Photocopying
Contact printing
Light boxes
355 27, 430138, 100162B, G03D 902, G03C 172
Patent
active
047680504
ABSTRACT:
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.
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Mathews A. A.
The Mead Corporation
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