Liquid supply device and liquid ejecting apparatus

A liquid supply device comprising:

• a liquid supply path used to supply liquid from an upstream side, which is a liquid supply source side, toward a downstream side at which the liquid is consumed;
• a defoaming chamber that is provided in the middle of the liquid supply path and holds a bubble contained in the liquid in order to make the bubble escape from the liquid;
• a decompression chamber that is provided at a position adjacent to the defoaming chamber with a partition wall interposed therebetween and is decompressed by a pump to have lower pressure than the defoaming chamber, the partition wall being configured to allow gas to permeate therethrough by decompression of the decompression chamber and to regulate permeation of liquid;
• a negative pressure chamber that communicates with the decompression chamber through a communication hole and has negative pressure to decompress the decompression chamber;
• a communication hole valve body that makes the communication hole closed when the communication hole valve body is in a closed state and makes the communication hole open when the communication hole valve body is in an open state;
• a communication hole valve body biasing member that biases the communication hole valve body in a direction in which the communication hole valve body is always in a closed state;
• a flexible member for negative pressure chamber that forms a part of a wall surface of the negative pressure chamber and is displaced on the basis of a change in pressure within the negative pressure chamber;
• and
• a communication hole valve body pressure member that is displaced by the displacement of the flexible member for negative pressure chamber to thereby press the communication hole valve body in a direction in which the communication hole valve body is in an open state against a biasing force of the communication hole valve body biasing member.