Patent ID: 6712460
Filing Date: 2004-03-30
Classification: B41J

Abstract:
An inkjet printing head comprising a sub-tank, the sub-tank being configured to reserve ink to be supplied to said inkjet printing head and to communicate with a main tank and be supplied with ink from the main tank, the sub-tank comprising:a movable section constituted by a deformable film sheet and defining a space for reserving ink; a spring which is mounted on the movable section and which serves to generate a negative pressure within said sub-tank with respect to said inkjet printing head; and a channel for rendering the space defined by said movable section communicable with the outside, said channel being supplied with ink from the main tank by displacing said movable section and said spring so as to change a volume of the space, and said channel being used to discharge gases trapped within the space from the space to the outside, wherein said channel is provided in a position where said channel does not interfere with said movable section and a displaceable portion of said spring.