Patent ID: 11858272
Assignee: KINPO ELECTRONICS, INC.
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. An ink circulation system, comprising:
an ink cartridge, having an output pipeline and an ink cartridge valve, wherein the ink cartridge valve is disposed on the output pipeline;
an ink tank, disposed on one side of the ink cartridge and connected to the output pipeline of the ink cartridge;
an ink pump, connected to the output pipeline and the ink tank through an ink pipeline;
a first valve, connected to the ink tank through a first pipeline;
a second valve, disposed on the output pipeline;
a third valve, connected to the output pipeline and the ink pipeline through a return pipeline;
a printer head, connected to the ink tank and the return pipeline;
a heating assembly, disposed in the ink tank; and
a positive-negative pressure assembly, connected to the first pipeline through a gas pressure pipeline,
wherein the ink pump is used to extract ink from the ink cartridge and fill the ink into the ink tank along the output pipeline and the ink pipeline, and the positive-negative pressure assembly provides a positive pressure or a negative pressure to the ink tank to squeeze or absorb the ink in the ink tank,
wherein the positive-negative pressure assembly has a positive pressure pump, a negative pressure pump, and a gas pressure valve, the positive pressure pump and the negative pressure pump are respectively connected to the gas pressure pipeline, the gas pressure valve is disposed between the gas pressure pipeline and the first pipeline, and the gas pressure valve is used to switch the first pipeline to be connected to the positive pressure pump or the negative pressure pump.