Image forming apparatus having a transfer drum with a vacuum she

Details Image forming apparatus having a transfer drum with a vacuum she Image forming apparatus having a transfer drum with a vacuum she

1992-12-03

1994-03-01

Fuller, Benjamin R.

Photocopying

Contact printing

Light boxes

355271, 355279, 271196, 271276, G03G 2100

Patent

active

052912604

ABSTRACT:
An image forming apparatus in which toner images are transferred using a combination of heat and pressure to a receiving sheet includes a transfer drum with a vacuum holding means for the receiving sheet. To prevent a loss of nip pressure over vacuum holes, the drum is formed of a metallic core with a slot running generally parallel to the core's axis of rotation. A thin metallic sheet is positioned around the core, which sheet has very thin slots running across the slot in the core. A vacuum is applied to the core slot which communicates through the sheet slots to hold a receiving sheet to the outside surface of the metallic sheet.

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patent: 5072922 (1991-12-01), Paulson
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