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Increased Opc Drum/Paper Relative Speed to Allow Higher Printing Speeds and Lower Toner Usage

IP.com Disclosure Number: IPCOM000035081D
Original Publication Date: 1989-Jun-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Bowen, ME: AUTHOR [+3]

Abstract

This invention provides for the increase of speed of the paper through a xerographic printer without a change in speed or construction of the development system. This will allow an on-demand decrease in print time, or a decrease in toner usage, or both.

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Increased Opc Drum/Paper Relative Speed to Allow Higher Printing Speeds and Lower Toner Usage

This invention provides for the increase of speed of the paper through a xerographic printer without a change in speed or construction of the development system. This will allow an on-demand decrease in print time, or a decrease in toner usage, or both.

A schematic drawing of a standard development system for a xerographic printer is shown in Fig. 1. The photoconductor (PC) drum is first cleaned at cleaning station 1 and then charged at corona 1a. The area to be developed is exposed at a light source at 2 and the discharged area is developed with toner from developer roll 3, the toner T being transferred from the PC drum to the paper P at 4. In the standard machine, the tangential velocity of the drum (Vt) is the same as the linear velocity of the paper (Vp). The speed of the machine is limited by the time between the "stations" (1-4) around the drum. In this embodiment, increasing the speed of the machine significantly requires an increase in the size of the drum or other changes to the system. The size of the characters and their line spacing in the latent image on the drum is equal to the character size and spacing on the printed page since the speed Vt of the drum is the same as the speed Vp of the paper.

A schematic of the present invention is shown in Fig. 2. The tangential velocity of the drum remains the same as in the previous figure. However, the linear velocit...