Apparatus and method for thermal printing wherein donor slack is

Details Apparatus and method for thermal printing wherein donor slack is Apparatus and method for thermal printing wherein donor slack is

1992-06-29

1993-11-09

Fuller, Benjamin R.

Recorders

Thermal recording

400235, 4002351, 400232, B41J 232

Patent

active

052607160

ABSTRACT:
A thermal printer has a rotatably mounted supply spool, and a rotatably driven print drum for unwinding a dye donor web from the supply spool and advancing the web past a thermal print head at a print zone where dye is transferred to a print receiving medium by the print head. The print drum causes the supply spool to rotate as it unwinds web therefrom and further causes the web to be paid out of the print zone at a constant rate. A rotatably mounted take-up spool accumulates web paid out of the print zone and tensions the web. A capstan roller is interposed between the print drum and the take-up spool. The capstan roller drivingly engages the web and controllably advances the web towards the take-up spool as the web is paid out of the print zone. The capstan roller advances the web at a slower rate than the web is paid out of the print zone to eliminate tension on the donor web caused by the take-up spool as the donor web exits the print zone. Tension may also be eliminated by delaying operation of the capstan roller to allow a small amount of slack to accumulate in the web.

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Molloy et al., "Motor-Driven Ribbon Take-Up", IBM Bulletin, vol. 27, No. 1B, Jun. 1984, pp. 900-901.

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