Method of calibrating a ribbon winding mechanism for a printing

Details Method of calibrating a ribbon winding mechanism for a printing Method of calibrating a ribbon winding mechanism for a printing

1997-11-13

1999-07-13

Bennett, Christopher A.

Typewriting machines

Including interposed inking device for record-medium

Ribbon-feeding mechanism

400232, B41J 3314

Patent

active

059216891

ABSTRACT:
A method of calibrating a ribbon winding mechanism of a printing apparatus which is adapted to perform a printing operation in which at a printing station a print head is moved relative to a first length of the ribbon to transfer print medium from the first length of the ribbon onto a substrate and the ribbon is subsequently advanced a predetermined amount to present a second length of ribbon at the printing station for use in a further printing operation, the winding mechanism comprising a supply spool and a take-up spool and there being a ribbon path between the supply and take-up spool through the printing station, and a motive means to cause the ribbon to be moved along the ribbon feed path and wound onto the take-up spool, and a sensing means to sense movement of the ribbon as the take-up spool is rotated and to provide a signal to a control means in response, the method being characterized in that prior to performing the printing operation, the take-up spool is rotated a predetermined amount whilst the sending means senses the resultant ribbon movement along the ribbon feed path and the control means determines from the signal received from the sensing means the amount to rotate the take-up spool in the subsequent printing operation to advance the ribbon the predetermined amount.

REFERENCES:
patent: 4969761 (1990-11-01), Gibson-Saxty
patent: 5209587 (1993-05-01), Herbert et al.
patent: 5433539 (1995-07-01), German
patent: 5647679 (1997-07-01), Green et al.
patent: 5700096 (1997-12-01), Satoh et al.

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