Browse Prior Art Database

Air Supply Pressure Controls for a Electrographic Document Reproduction Machine

IP.com Disclosure Number: IPCOM000085973D
Original Publication Date: 1976-Jul-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Hubbard, JH: AUTHOR

Abstract

A single air reservoir of limited capacity is a primary air supply for the Bernoulli detach nozzles and for so-called fuser puffer nozzles. The detach nozzles removes an imaged copy sheet from the transfer drum, allowing it to be directed through a paper path into a fuser which fuses toner ink onto the copy paper. A puffer operates with the fuser for ensuring that the imaged copy sheet continues on the desired paper path, as opposed to wrapping around the fuser rollers.

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Air Supply Pressure Controls for a Electrographic Document Reproduction Machine

A single air reservoir of limited capacity is a primary air supply for the Bernoulli detach nozzles and for so-called fuser puffer nozzles. The detach nozzles removes an imaged copy sheet from the transfer drum, allowing it to be directed through a paper path into a fuser which fuses toner ink onto the copy paper. A puffer operates with the fuser for ensuring that the imaged copy sheet continues on the desired paper path, as opposed to wrapping around the fuser rollers.

The activation of these air jets, the detach and puffer, is critically timed with respect to each copy cycle. In a given copy cycle, a detach air pulse occurs first followed by a fuser air pulse toward the end of the copy cycle.

When using a limited air supply, the reservoir pressure between a detach pulse and a fuser puffer pulse does not enable the reservoir to be built back to the initial pressure. Such pressure reduction occurs primarily to a detach pulse following a fuser puffer pulse. Accordingly, the first occurring detach air pulse will have a higher pressure than the subsequent air pulses.

Since detach is sensitive to pressure variations, such initial higher pressure detach air pulse should be eliminated. This is simply done by providing a "fuser A" pulse prior to the time the first copy sheet is to be detached from the transfer drum. This action is achieved in the startup cycle of the controller by supplying...