Patent ID: 11858275
Assignee: SCREEN HOLDINGS CO., LTD.
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 7:
8. A method of maintaining a filter of an inkjet printing apparatus which performs printing on a printing medium by feeding ink with a pump from an ink tank to an inkjet head through the filter, and dispensing the ink from the inkjet head to the printing medium, the method comprising:
operating the pump to engage in backward drive in time of functional recovery operation, for feeding the ink from downstream of the pump backward through the filter to the tank, to re-disperse ingredients of the ink captured in an upstream portion of the filter for use in the printing and for improving choking of the filter,
wherein the inkjet printing apparatus further comprises a supply pipe communicatively connecting the tank and the inkjet head, and a degassing filter mounted on the supply pipe between the pump and the inkjet head and downstream of the filter for removing bubbles from the ink, and
wherein the functional recovery operation is performed until an interface between the ink and gas in a portion of the supply pipe adjacent the inkjet head is located on a side of the degassing filter adjacent the inkjet head.