Thermal transfer ribbon mechanism and recording method

Details Thermal transfer ribbon mechanism and recording method Thermal transfer ribbon mechanism and recording method

1986-07-17

1987-12-08

Shaw, Clifford C.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346 76PH, 346136, 242179, 242188, 242190, 400232, 400234, 400235, G01D 1510, B41J 3334, G11B 1532

Patent

active

047121130

ABSTRACT:
A thermal printing apparatus is disclosed in which ribbon advancing mechanism including a supply spool and a take-up spool operated by a stepping motor is disclosed. Mechanism is provided for reversing the direction in which the take-up spool is driven by a specified amount during the printing cycle, in order to provide ribbon slack, so as to avoid smudging of the transferred ink on the receiving document and possible ribbon breakage during printing. The circumference of the accumulated ribbon on the take-up spool at any given time is considered in determining the number of steps and the step rate of the stepping motor in the reverse direction which must be taken in order to produce the desired amount of ribbon slack and slack take-up.

REFERENCES:
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patent: 4568950 (1986-02-01), Ross et al.
U.S. patent application Ser. No. 561,449, filed Dec. 14, 1983, Ralf M. Brooks et al., inventors, entitled, "Method and Apparatus for Thermally Printing Data in Special Fonts on Documents Like Checks".

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