Patent ID: 8425025
Filing Date: 2013-04-23
Classification: B41J

Abstract:
1. A liquid jetting device comprising: a main tank that stores a recording liquid; a sub tank that is connected to the main tank via a supply path, the recording liquid being supplied into the sub tank from the main tank by a predetermined pressure applied to the main tank; and an inkjet head having a nozzle that jets the recording liquid retained in the sub tank, wherein the sub tank includes a supply chamber that stores the recording liquid to be supplied to the nozzle, and a pressure control chamber that supplies the recording liquid from the main tank into the supply chamber, the pressure control chamber being connected to the supply path, and wherein the supply chamber includes a flexible member that is expanded outwardly by a spring and is deformed due to a negative pressure generated in the supply chamber by the jetting operation of the ink head, and a valve provided at a supply opening through which the recording liquid enters the supply chamber from the pressure control chamber, the valve being configured to open and close the supply opening according to the deformation of the flexible member, and wherein the pressure control chamber includes a pressure resistor having a filter function provided near the supply opening, the pressure resistor being placed in such a manner as to extend across a flow direction of the recording liquid, and a volume changing member provided on an outside wall of the sub tank on a pressure control chamber side near the supply opening, on at least a downstream side with respect to the pressure resistor in the flow direction of the recording liquid, the volume changing member facing an outside of the sub tank and being deformable in a direction such that a volume of the pressure control chamber increases when the pressure control chamber receives a pressure that is higher than a pressure in the supply chamber, wherein the volume changing member includes a first volume changing unit disposed on an upstream side with respect to the pressure resistor in the flow direction of the recording liquid and a second volume changing unit disposed on the downstream side with respect to the pressure resistor in the flow direction of the recording liquid.