Ink jet recording apparatus of the continuous jet type and automatic ink jet jetting axis adjusting method of the same
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United States of America Patent
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Jun 28, 1994
Grant Date -
N/A
app pub date -
Feb 19, 1993
filing date -
Mar 2, 1992
priority date (Note) -
Expired
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Abstract
An ink jet recording apparatus of the continuous jet type and an automatic ink jet jetting axis adjusting method of the same wherein the position of an ink jet jetting axis or nozzle axis can automatically be adjusted to an optimum position by a deflecting electric field are disclosed. When a carriage is at its home position, jetting of ink from a nozzle is started, and an MPU changes over a change-over switch to a test signal generator side. The test signal generator generates a test signal, which is a sum of an amplified recording signal and a bias potential outputted from a bias power source, and applies the test signal to a controlling electrode. The MPU checks an output of a current detector (jet current) based on charged ink drops caught by a conductive drop catcher to discriminate the positional relationship between an ink jet jetting axis and a knife edge. The MPU then changes the bias potential of the bias power source in accordance with a result of the discrimination. Consequently, the controlling signal applied to the controlling electrode is varied to adjust the ink jet jetting axis to its optimum position.
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