Liquid circulation device and liquid discharging apparatus

摘要

A liquid circulation device includes a housing having an outlet and an inlet, a circulation unit configured to convey liquid out of the housing through the outlet and recover liquid into the housing through the inlet, a liquid supplying unit configured to supply liquid into the housing, an air conveying unit configured to convey air into and out of the housing, a level detecting unit configured to detect a level of the liquid in the housing, a pressure sensing unit configured to detect a pressure of the air in the housing, and a control unit configured to control a pressure of the liquid in the housing by controlling the liquid supplying unit or the air conveying unit, based on the level and the pressure of the air.

主权项

1. A liquid circulation device for circulating liquid through an inkjet head, comprising:
a housing having an outlet and an inlet; a circulation unit configured to convey the liquid out of the housing through the outlet to the inkjet head and recover the liquid from the inkjet head into the housing through the inlet; a liquid supplying unit configured to supply liquid into the housing; an air conveying unit configured to convey air into and out of the housing; a level detecting unit configured to detect a level of the liquid in the housing; a pressure sensing unit configured to detect a pressure of the air in the housing; and a control unit configured to control one of the liquid supplying unit and the air conveying unit, based on the detected pressure of the air and the detected level of the liquid, wherein when the detected pressure of the air is smaller than a first predetermined value and the detected level of the liquid is lower than a second predetermined value, the liquid supplying unit is controlled to supply the liquid into the housing such that a pressure of the liquid in the inkjet head is in a predetermined range, and the air conveying unit is not controlled for adjustment of the pressure of the liquid, and when the detected pressure of the air is smaller the first predetermined value and the detected level of the liquid is higher than the second predetermined value, the air conveying unit is controlled to convey the air into the housing such that the pressure of the liquid in the inkjet head is in the predetermined range, and the liquid supplying unit is not controlled for the adjustment of the pressure of the liquid.