| 摘要 |
Liquid is appropriately circulated with a low cost and thereby precipitation of fine particles in the liquid is prevented and bubbles in the liquid flow passage are removed. A liquid circulation system includes an inkjet head 2 in which a common ink flow passage 16 is formed, an ink cartridge 3, a supply flow passage 4 through which ink is supplied from the ink cartridge 3 to an inlet 16a of the common ink flow passage 16, a return flow passage 5 through which the ink is returned from the outlet 16b of the common ink flow passage 16 to the ink cartridge 3, a tube pump 6 sending the ink in the supply flow passage 4, a tube pump 7 sending the ink in the return flow passage 5, a pressurization bellows unit 8 pressurizing the ink in the supply flow passage 4, a pressure reduction bellows unit 9 depressurizing the ink in the return flow passage 5, a pressurization regulator 10 maintaining the inlet 16a at a center value "+±" of a designated head value, and a pressure reducing regulator 11 maintaining the outlet 16b at a center value "-±" of the designated head value. |
