High precision donor web positioning apparatus and method for a

Details High precision donor web positioning apparatus and method for a High precision donor web positioning apparatus and method for a

1992-06-29

1994-01-18

Fuller, Benjamin R.

Recorders

Thermal recording

400235, 4002351, 400233, 4002403, 4002404, B41J 232

Patent

active

052803031

ABSTRACT:
A thermal printer has a donor web positioning system that uses a single sensor in conjunction with a capstan roller. The roller is driven by a stepper motor to precisely meter the donor web. The roller is positioned between the print drum and the take-up spool and drivingly engages the donor web and controllably advances the donor web towards the take-up spool at a known rate as the web is paid out of the print zone. The single sensor is positioned between the print drum and the supply spool to detect the start of the plurality of frames of dye, as the donor web advances. Each individual frame is then positioned properly by causing the capstan drive motor to advance a known, pre-programmed number of steps to place the beginning of each color frame at the heater line of the thermal head.

REFERENCES:
patent: 4505603 (1985-03-01), Yana
patent: 4614950 (1986-09-01), Ito
patent: 4893951 (1990-01-01), Iwatani et al.
patent: 5017943 (1991-05-01), Ogita et al.
patent: 5021804 (1991-06-01), Nozawa et al.
patent: 5117241 (1992-05-01), Stephenson

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