Browse Prior Art Database

Minimum Temperature Rise Energy Control for "Resistive Ribbon Thermal Transfer" Printer

IP.com Disclosure Number: IPCOM000060395D
Original Publication Date: 1986-Apr-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Countryman, CP: AUTHOR [+3]

Abstract

This system controls the energy supplied at each electrode of a resistive ribbon printer so that at least the minimum temperature for printing is reached for each pel to be printed. The control is open-loop which controls the energy supplied to each print electrode driver by adjusting the pulsewidth, duty cycle, drive voltage and/or drive current. This is done by using a combination of factors which may include print data-related factors, such as adjacent pels being printed, recent printing history, printing speed, ratio of print speed to ribbon feed speed, ribbon geometry and properties, and machine configuration.

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Minimum Temperature Rise Energy Control for "Resistive Ribbon Thermal Transfer" Printer

This system controls the energy supplied at each electrode of a resistive ribbon printer so that at least the minimum temperature for printing is reached for each pel to be printed. The control is open-loop which controls the energy supplied to each print electrode driver by adjusting the pulsewidth, duty cycle, drive voltage and/or drive current. This is done by using a combination of factors which may include print data-related factors, such as adjacent pels being printed, recent printing history, printing speed, ratio of print speed to ribbon feed speed, ribbon geometry and properties, and machine configuration. This control is open-loop because it does not actually rely on measurement of ribbon temperature to control the energy supplied, but estimates the energy needed to reach the proper temperature based on the parameters referred to. The major elements of a printing process employing energy control are shown in the figure. Pel (picture element) data to be printed may be obtained from a character generator 5 or from an image buffer 10. This data will be available in a form such that all pels for the column being printed will be known (15). The data representing this column to be printed (15) will serve as input to the energy control circuits 20. The energy control circuits 20 will provide outputs to control each of the print head drivers 25. The print head drivers 25 pro...