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Non-Mechanical Printing Toner Transport System

IP.com Disclosure Number: IPCOM000047770D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Keefe, GE: AUTHOR [+2]

Abstract

This system provides alternating parallel conductor strips to propagate toner chains linearly. The chains are energized alternately by staggered bipolar current pulses. Dry toner printer and copiers use a system of rotating magnets to move the toner from its reservoir to the printing area. Such a toner system is limited in speed, control and reliability because of its mechanical nature. In electrographic printing there is the problem of integrating the toner transport system and the recording head. This system uses fields produced by conductors 10 and 11 to move the toner 14. The system is designed as follows: Conductors 10, 11 are deposited orthogonally to the desired toner propagation direction 12. Every other conductor is wired in series, 10 to 10, 11 to 11.

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Non-Mechanical Printing Toner Transport System

This system provides alternating parallel conductor strips to propagate toner chains linearly. The chains are energized alternately by staggered bipolar current pulses. Dry toner printer and copiers use a system of rotating magnets to move the toner from its reservoir to the printing area. Such a toner system is limited in speed, control and reliability because of its mechanical nature.

In electrographic printing there is the problem of integrating the toner transport system and the recording head. This system uses fields produced by conductors 10 and 11 to move the toner 14. The system is designed as follows: Conductors 10, 11 are deposited orthogonally to the desired toner propagation direction 12. Every other conductor is wired in series, 10 to 10, 11 to 11. Bipolar currents (pulses) are applied to each conductor 10, 11 alternately 90OE out of phase with respect to each adjacent conductor. Finally, a magnetic field is applied in the Z direction to form polarized toner chains 14. The fields produced by the bipolar current pulses 15, 16 act on the polarized toner chains 14, propagating them along the desired path. This is very similar to propagating magnetic bubbles. Thus, field access schemes (electromagnets, etc.) are also suitable. The advantages to this type of toner transport scheme are: 1. It is integrated easily with the recording head (electrographic printing). 2. It provides better control of toner movement...