| 摘要 |
PROBLEM TO BE SOLVED: To stably form an image with a good quality by discharging bubbles introduced in an ink supplying path from an ink tank to a recording head without wasting the ink in a simple mechanism. SOLUTION: An ink introducing part 27 provided in the upper part of an ink chamber 21, deformable according to the ink capacity while maintaining the negative pressure of an ink, is provided with a replenishing valve comprising a valve seat 272 made of an elastic member, having an ink introducing path 271, a ball 273, and a compressing spring 274 for blocking the ink introducing path 271 by pressuring the ball 273 against the valve seat 272. A degassing part 28 is provided with a sealing part 282 comprising an elastic member with a constantly-shut slit formed in the center so that introduction of the air into a sub tank 2 can be prevented even in the case the ink level in the ink chamber 21 is lowered. |
