Patent ID: 11865847
Assignee: nan
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A liquid discharge apparatus comprising:
a head having a nozzle;
a tank in which a height of a liquid surface, in a case that the tank stores a maximum amount of a liquid, is positioned above an opening of the nozzle;
a gas channel configured to communicate a gas layer of the tank with outside of the tank, via an atmosphere opening port which is opened to the outside;
a valve unit configured to open or close the atmosphere opening port or the gas channel;
a memory configured to store an opening threshold value ΔV; and
a controller connected to the memory and configured to control the valve unit,
wherein the controller is configured to execute:
counting of a count value indicating an amount of the liquid discharged from the nozzle in a case that the valve unit is in a close state in which the valve unit closes the atmosphere opening port or the gas channel; and
making of the valve unit to be in an open state in which the valve unit opens the atmosphere opening port or the gas channel, under a condition that the count value has reached the opening threshold value ΔV, and

wherein the opening threshold value ΔV is represented by

ΔV≤(Vtmax−VI)×Pm/(P−Pm),

wherein Vtmax represents a volume of the tank, Vi represents the maximum amount of the liquid storable in the tank, P represents an atmospheric pressure, and Pm represents a meniscus-withstanding pressure of the liquid formed in the nozzle.