Method of adjusting a head gap for a wire dot impact printer

Details Method of adjusting a head gap for a wire dot impact printer Method of adjusting a head gap for a wire dot impact printer

1993-07-14

1996-05-21

Hilten, John S.

Typewriting machines

Including adjustment for optimum printing plane

400 56, 40012404, 40012405, B41J 230

Patent

active

055183239

ABSTRACT:
According to a method of adjusting a head gap, a wire dot head is set to a predetermined position of a reference head gap; a printing pattern for detecting printing time is printed by a plurality of pins; reference printing times of respective pins are detected. Next, a test printing is performed with test printing dots previously selected from printing data, and printing time of the test printing is detected. Then, the thickness of the printing media is calculated based on the reference printing time and the printing time of the test printing. At that time, a rule of thumb in which the difference of the printing time corresponds to the difference of the head gap, is used. Then, a shift amount of the wire dot head is calculated for setting the head gap to an optimum value according to the thickness of the printing media, and gap shifting mechanism shifts the wire dot head by the shift amount. This leads to highly accurate detection of the head gap and improves printing quality thereof.

REFERENCES:
patent: 4907901 (1990-03-01), Mitchell
patent: 5088842 (1992-02-01), Ito et al.
patent: 5156464 (1992-10-01), Sakai
patent: 5204537 (1993-04-01), Bennet et al.
patent: 5205658 (1993-04-01), Iriguchi

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