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Stored Value Energy Control for "resistive Ribbon Thermal Transfer" Printer

IP.com Disclosure Number: IPCOM000041089D
Original Publication Date: 1987-Jul-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Countryman, GP: AUTHOR [+2]

Abstract

A resistive ribbon thermal transfer printing system is described in which the energy supplied at each print electrode is controlled for each pel to be printed so that the minimum temperature is reached in the ribbon necessary to cause the proper amount of ink to be transferred to the paper. This is accomplished by using an open loop method which controls the energy supplied by the print electrode drivers according to a value stored along with the print data for that column.

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Stored Value Energy Control for "resistive Ribbon Thermal Transfer" Printer

A resistive ribbon thermal transfer printing system is described in which the energy supplied at each print electrode is controlled for each pel to be printed so that the minimum temperature is reached in the ribbon necessary to cause the proper amount of ink to be transferred to the paper. This is accomplished by using an open loop method which controls the energy supplied by the print electrode drivers according to a value stored along with the print data for that column.

The printing system utilizes a thermal transfer printing ribbon having a resistive substrate as the active electrical heating circuit and a conductive inner layer which serves as a common electrical path. The print head has a plurality of print electrodes which are in contact with the resistive substrate and are selectively energized to produce the desired print pattern.

Higher print speeds and improved character appearance can be achieved by controlling the energy supplied at each print electrode for each pel to be printed by means of a value stored along with the print data. This stored energy value may be empirically determined during the development of the font according to the pattern of pels to be printed in that column and the patterns in other columns in that character. This control is open-loop since it does not actually rely on measurement of ribbon temperature to control the energy supplied, but adjusts the...