Thermal printing apparatus with tensionless donor web during pri

Details Thermal printing apparatus with tensionless donor web during pri Thermal printing apparatus with tensionless donor web during pri

1990-04-04

1992-05-26

Fuller, Benjamin R.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346 76PH, 400120, 400232, 400225, 4002242, B41J 1706, B41J 2325

Patent

active

051172410

ABSTRACT:
Thermal printing apparatus includes motor control means for variably controlling the rotational speed of a take-up spool used to wind-up an expended dye-bearing donor web after passage through a print zone. During a printing step in which the donor web is contacted by a thermal print head, the take-up spool is rotated at a relatively slow speed, whereby the spool takes up the donor web at a rate slower than that at which the web is payed-out of the print zone. By this arrangement, the take-up spool exerts zero tension on the web during the printing operation, and certain tension-produced artifacts in the thermal print are eliminated. During the interval between successive printing operations, the take-up spool is rotated at a rate sufficient to take-up the web slack produced during printing.

REFERENCES:
patent: 4462656 (1987-02-01), Shibuya et al.
patent: 4712113 (1987-12-01), Brooks et al.
patent: 4815870 (1989-03-01), Sparir et al.

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