Hot melt ink jet print head

摘要

A hot melt ink jet print head in which ink can be circulated without an ink level difference between a main chamber and a sub chamber. The main chamber and the sub chamber of an ink tank is connected via a channel. The main chamber is connected to a nozzle head via an outgoing channel. Also the sub chamber is connected to the nozzle head via a returning channel. Two valves are provided inside of the sub chamber, each for closing either one of the channel and the returning channel. Normally, the returning channel is closed by the valve, and the channel is opened, so that ink can flow from the sub chamber to main chamber and further to the nozzle head. However, during the purging operation, the channel is closed with the valve, and the returning channel is opened, so that the ink can flow from the main chamber to the sub chamber via the nozzle head.