Browse Prior Art Database

Thermal Integration Printer

IP.com Disclosure Number: IPCOM000046354D
Original Publication Date: 1983-Jul-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 3 page(s) / 74K

Publishing Venue

IBM

Related People

Schierhorst, AE: AUTHOR

Abstract

Conventional thermal printers employ thin film multi-element stationary print heads to form images on thermally sensitive paper by applying short duration pulses of heat to the moving paper as it passes the head. Duty cycle restrictions on the pulsed heating and cooling of the head elements restrict the printing speed to less than 500 lines per minute.

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Thermal Integration Printer

Conventional thermal printers employ thin film multi-element stationary print heads to form images on thermally sensitive paper by applying short duration pulses of heat to the moving paper as it passes the head. Duty cycle restrictions on the pulsed heating and cooling of the head elements restrict the printing speed to less than 500 lines per minute.

Thermal printing apparatus shown in the figures raises this limit by using a thermal integration technique in which a heat-absorbent medium moving in coordination with the paper applies image-marking heat to the paper continuously while it is in motion. The absorbent medium receives the heat for imaging in short duty cycle bursts and transfers it to the paper over intervals substantially greater than the duty cycle.

In the apparatus shown in Figs. 1 and 2, thermal paper 1 is fed from supply roll 2 over drum 3 where it travels in proximity to and at the same speed as endless web 4 which holds a heat absorbent powder 5 by magnetic attraction. The powder is applied in an image pattern, by means described below, and as the paper and web converge, they are irradiated by an energy source 6 which intensively heats the powder but does not heat the paper to its marking point. The paper and web travel in proximity over a distance 7, while the powder 5 cumulatively transfers its retained heat to the paper, and then the paper exits through feed rollers 8. The web is then demagnetized at 9, to release the heated (and patterned) powder into supply pan 10, and subsequently remagnetized at 11 so that it picks up a fresh pattern of powder as it continues through developing assembly 12. The belt is magnetized in an image pattern at 11 so that the p...