Liquid ejection head, liquid ejection device, and image forming apparatus

A liquid ejection device comprising:

• a tank for storing liquid;
• a pump for transferring the liquid from the tank;
• a liquid supply path through which the liquid is supplied from the pump;
• and
• a liquid ejection head connected to the liquid supply path and configured to eject the liquid, the liquid ejection head including:
• a plurality of pressure chambers arranged in a first direction and respectively communicating with nozzles, each pressure chamber capable of storing the liquid,
• a plurality of pairs of upstream and downstream flow paths, each pair communicating with a corresponding one of the pressure chambers, the upstream flow path of each pair being connected to a first end of the corresponding pressure chamber, and the downstream flow path of said each pair being connected to a second end of the corresponding pressure chamber,
• an upstream common chamber communicating with the upstream flow paths,
• an upstream port communicating with the upstream common chamber at a first end of the upstream common chamber in the first direction, a downstream common chamber communicating with the downstream flow paths,
• a downstream port communicating with the downstream common chamber,
• a bypass flow path communicating with the upstream common chamber at a second end of the upstream common chamber in the first direction and the downstream common chamber, and
• a pressure damper provided in the bypass flow path.

An image forming apparatus comprising:

• an ink jet head;
• and
• a control board configured to control the ink jet head, wherein
• the ink jet head includes:
• a plurality of pressure chambers arranged in a first direction and respectively communicating with nozzles, each pressure chamber capable of storing ink,
• a plurality of pairs of upstream and downstream flow paths, each pair communicating with a corresponding one of the pressure chambers, the upstream flow path of each pair being connected to a first end of the corresponding pressure chamber, and the downstream flow path of said each pair being connected to a second end of the corresponding pressure chamber,
• an upstream common chamber communicating with the upstream flow paths,
• an upstream port communicating with the upstream common chamber at a first end of the upstream common chamber in the first direction,
• a downstream common chamber communicating with the downstream flow paths,
• a downstream port communicating with the downstream common chamber at a first end of the downstream common chamber in the first direction,
• a bypass flow path communicating with the upstream common chamber at a second end of the upstream common chamber in the first direction and the downstream common chamber at a second end of the downstream common chamber in the first direction, and
• a pressure damper provided in the bypass flow path.