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Dot Helix Drum Electrostatic Printer

IP.com Disclosure Number: IPCOM000050213D
Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Lane, R: AUTHOR [+2]

Abstract

This article describes an electrostatic printing mechanism having improved printing speed and improved printing quality.

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Dot Helix Drum Electrostatic Printer

This article describes an electrostatic printing mechanism having improved printing speed and improved printing quality.

As shown in Figs. 1 and 2, styli 10 are mounted in a helix pattern on a rotating drum 12 where the stability and the tolerance are much more controllable than styli mounted on a belt; therefore, the print speed can be increased using a fast spinning drum. The styli 10 are in contact with the front surface of paper 14. Electrodes 16 are located at the back of the paper 14. The drum 12 is grounded or biased, and input electrical pulses sent to the electrodes are synchronized with a dot position encoder 18. As the drum 12 rotates, the contact points between the electrodes and the styli propagate in the horizontal direction to form a dot line. By skewing the electrodes a predetermined angle to compensate for the paper motion, the printing can be accomplished with a constant paper movement.

The printing speed of the disclosed printer can be tailored by the number of electrodes. It can be made with one electrode and one helix of dots in a low speed printing to multiple electrodes and multiple helix of dots in a very high speed printing.

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