Patent ID: 7475974

Claim:
An inkjet recording apparatus, which comprises: a main body including an ink container for storing ink, an ink supply pump for supplying the ink, and an operation control section; a print head including a nozzle for expelling the ink supplied from the main body as ink particles, charging electrodes for charging the ink particles, deflecting electrodes for deflecting the charged ink particles, and a gutter for collecting ink particles that have not been used for printing; and a cable including an ink supply path through which the ink is supplied from the main body to the print head, an ink collecting path through which the ink particles collected in the gutter are returned to the ink container, and signal lines interconnecting the operation control section and the print head; and an ink collecting pump, disposed in the print head, for transferring the ink particles collected in the gutter to the ink container, wherein: the ink collecting pump has a main body case, a diaphragm that reciprocates in the main body case, an ink chamber that is formed between one side of the diaphragm and the body case, an ink inlet port and an ink outlet port provided so as to communicate with the ink chamber, an inlet non-return valve provided in the ink inlet port, and an outlet non-return valve provided in the ink outlet port; the ink inlet port is connected to the gutter in such a way that they communicate with each other: and the ink outlet port is connected to the ink collecting path in such a way that they communicate with each other.