Patent ID: 8915580
Filing Date: 2014-12-23
Classification: B41J

Abstract:
1. A liquid supplying apparatus comprising: a liquid supplying path for supplying liquid from an upstream side which becomes a liquid accommodator side accommodating the liquid toward a downstream side which becomes a liquid ejecting head side ejecting the liquid; a pump which performs a suction operation of sucking the liquid accommodated in the liquid accommodator and a discharging operation of discharging the sucked liquid toward the liquid ejecting head side; a buffer chamber which is provided at a downstream side of the pump in the liquid supplying path, temporarily stores the liquid discharged from the pump, and has a movable section for supplying the temporarily stored liquid toward the liquid ejecting head side under pressure; a differential pressure valve which is provided between the buffer chamber and the liquid ejecting head in the liquid supplying path, and is closed to block the liquid supplying path when a negative pressure of the downstream side which becomes the liquid ejecting head side is greater than a pressing force of an upstream side which becomes a buffer chamber side; and a discharging side one-way valve which is provided between the pump and the buffer chamber in the liquid supplying path, is closed along with the suction operation of the pump, and is opened along with the discharging operation of the pump, wherein the pump is a diaphragm type pump which has a pump concave section provided on a first surface of a flow path forming member forming a plate shape, and a diaphragm which is formed so as to surround the pump chamber by covering an opening portion of the pump concave section, the discharging side one-way valve has a discharging side valve chamber that is formed so as to be surrounded and formed by a discharging side concave section provided on a second surface of an opposite side of the first surface of the flow path forming member and a flexible member attached to the flow path forming member so as to cover the opening portion of the discharging side concave section, and the pump concave section and the discharging side concave section are provided so as to overlap with each other in a vertical direction, and the liquid supplying path is constituted by a through hole provided in the flow path forming member so as to communicate with the pump concave section and the discharging side concave section.