Development apparatus having a transport roll rotating at least

Details Development apparatus having a transport roll rotating at least Development apparatus having a transport roll rotating at least

1990-03-19

1991-11-12

Grimley, A. T.

Coating apparatus

With means to apply electrical and/or radiant energy to work...

With electromagnetic and/or electrostatic removal of...

118647, 118654, 355245, 355247, 355259, 355261, G03G 1506

Patent

active

050638750

ABSTRACT:
An apparatus which develops an electrostatic latent image. A transport roll advances developer material from a chamber to a donor roll. The donor roll advances the toner particles to the latent image. The latent image attracts toner particles from the donor roll. In order to improve the speed with which toner particles removed from the donor roll are replaced, an alternating voltage is applied between the two rolls.
The magnetic transport roll is driven to rotate at a surface velocity at least 2, but not more than 5 times that of the rotational surface velocity of the donor roll. Also, the compression pile height (CPH) vs the spacing between the spacing between the donor roll and the transport roller (DRS) is found to be optimal when meeting the ratio CPH:DRS=2:3.

REFERENCES:
patent: 3929098 (1975-12-01), Liebman
patent: 4508052 (1985-04-01), Kohyama
patent: 4518245 (1985-05-01), Bares
patent: 4743937 (1988-05-01), Martin
patent: 4868600 (1989-09-01), Hays et al.

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