Patent ID: 8702215
Filing Date: 2014-04-22
Classification: B41J

Abstract:
1. An inkjet head unit comprising: an inkjet head; and an operation mechanism disposed downstream of the inkjet head in an ink flow direction, wherein the inkjet head unit is arranged between an ink retaining unit and a negative pressure source in an inkjet recording apparatus having the ink retaining unit configured to retain the ink supplied to the inkjet head and the negative pressure source configured to apply negative pressure to the inkjet head to supply the ink from the ink retaining unit to the inkjet head, wherein the operation of the operation mechanism maintains the negative pressure state of the inkjet head and adjusts the flow of the ink while the ink discharge operation from the inkjet head is being performed, wherein the operation mechanism is disposed on an ink flow channel in which the ink flows, and includes a flexible member and an open-close mechanism, wherein the flexible member is urged from inside of the flow channel to outside of the flow channel, and wherein the open-close mechanism moves due to a deformation of the flexible member caused by a difference between the pressure in the ink flow channel communicating with an inkjet head side and the pressure in the ink flow channel communicating with the negative pressure source, and opens or closes the ink flow channel.