PURPOSE: To stably supply ink over a long period of time by a structure wherein an equipment, which supplies ink sucked in from an ink tank to an ink jet head under pressure, is provided at every ink jet head.
CONSTITUTION: A check valve 305 is provided in an ink tank 301. The check valve 305 comprises in providing two non-return valves 313 and 314, which respectively consists of valve supporting parts 307 and 308, valves 309 and 310 and valve retaining parts 311 and 312, normal to each other in a check elbow 306. A cylinder block 315 consists of a spring 317, a spring retainer 318 and a piston 319, all of which are inserted into a cylinder 316 and blocked by a cylinder cover 320 within the cylinder 316. The cylinder 316 communicates with an ink flow passage 324 formed between the non-return valves 313 and 314 of the check valve 305 by means of a joint 323.
MATSUFUJI YOUJI
HITOTSUBASHI HIROO
