US 12,337,598 B2
Maintenance method of head unit
Shinichi Tsubota, Azumino (JP)
Assigned to Seiko Epson Corporation, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Jan. 6, 2023, as Appl. No. 18/151,017.
Claims priority of application No. 2022-001482 (JP), filed on Jan. 7, 2022.
Prior Publication US 2023/0219339 A1, Jul. 13, 2023
Int. Cl. B41J 2/045 (2006.01)
CPC B41J 2/04588 (2013.01) [B41J 2/04581 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A maintenance method of a head unit including a first nozzle array having a plurality of first nozzles arranged in parallel along a first axis and discharging a liquid, a second nozzle array having a plurality of second nozzles arranged in parallel along a second axis parallel to the first axis and discharging a liquid, a plurality of first pressure chambers provided corresponding to the plurality of first nozzles and filled with the liquid, a plurality of second pressure chambers provided corresponding to the plurality of second nozzles and filled with the liquid, a plurality of first driving elements provided corresponding to the plurality of first pressure chambers for varying pressures in the corresponding first pressure chambers, a plurality of second driving elements provided corresponding to the plurality of second pressure chambers for varying pressures in the corresponding second pressure chambers, and a supply section that is configured to supply driving signals to the plurality of first driving elements and the plurality of second driving elements, the method comprising:
in a first period,
supplying a first driving signal having a first waveform to one first driving element among the plurality of first driving elements to eject the liquid in one first pressure chamber corresponding to the one first driving element among the plurality of first pressure chambers from one first nozzle corresponding to the one first pressure chamber among the plurality of first nozzles; and
supplying a second driving signal having a second waveform different from the first waveform to one second driving element among the plurality of second driving elements to eject the liquid in one second pressure chamber corresponding to the one second driving element among the plurality of second pressure chambers from one second nozzle corresponding to the one second pressure chamber among the plurality of second nozzles; and
in a second period different from the first period,
supplying a third driving signal having a third waveform different from the first waveform to the one first driving element to eject the liquid in the one first pressure chamber from the one first nozzle; and
supplying a fourth driving signal having a fourth waveform different from the second waveform and the third waveform to the one second driving element to eject the liquid in the one second pressure chamber from the one second nozzle.