Gap adjusting device for a print head used in an ink jet recordi

Details Gap adjusting device for a print head used in an ink jet recordi Gap adjusting device for a print head used in an ink jet recordi

1998-03-04

2000-06-20

Smith, Matthew S.

Incremental printing of symbolic information

Ink jet

Controller

B41J 25308

Patent

active

060769092

ABSTRACT:
A capacitance is detected between an ejecting electrode and an opposite electrode by a capacitance detecting circuit with a recording medium placed on the opposite electrode. An electric field strength in the ejecting electrode is calculated by a gap adjustment control circuit based upon the detected capacitance. A motor driving circuit is controlled so that the electric field strength is set to a preset value. A lead screw coupled to the ejecting electrode is rotated by a motor and a gap between the ejecting electrode and the opposite electrode is thereby adjusted. Even if the thickness of a used recording medium changes, the ejecting electric field strength is kept stable and the recording quality is stabilized.

REFERENCES:
patent: 5078517 (1992-01-01), Hiroshi et al.
patent: 5474391 (1995-12-01), Andou et al.
patent: 5518323 (1996-05-01), Sakaino et al.

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