Patent ID: 11964493
Assignee: SEIKO EPSON CORPORATION
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A liquid ejecting apparatus comprising:
a head unit having a plurality of nozzles ejecting a liquid, a filter provided with a hole through which the liquid is configured to pass, a filter chamber including an upstream chamber and a downstream chamber, which are partitioned by the filter, a first nozzle group formed by a plurality of the nozzles, and a second nozzle group formed by a plurality of the nozzles;
a mounting portion on which the head unit is detachably mounted;
a gas introduction unit configured to introduce a gas into the filter chamber; and
a control unit, wherein
the nozzles forming the second nozzle group communicate with the nozzles forming the first nozzle group via the filter of the filter chamber,
when a pressure difference between a pressure on a gas side and a pressure on a liquid side, at which a gas-liquid interface formed in the hole of the filter is able to be maintained, is defined as a withstand pressure Pf and a pressure difference between a pressure on the gas side and a pressure on the liquid side, at which a gas-liquid interface formed in the nozzle is able to be maintained, is defined as a withstand pressure Pn, the withstand pressure Pf is greater than the withstand pressure Pn, and
the control unit executes, before the head unit is removed from the mounting portion, a pre-operation of forming the gas-liquid interface in the hole provided in the filter by controlling the gas introduction unit and introducing the gas into the filter chamber.