US 6,712,460 B2Granted

Inkjet printing head

AssigneeCanon Kabushiki Kaisha

InventorsTetsuya Ohashi, Naoji Otsuka, Hiroyuki Inoue, Hiroyuki Ishinaga, Nobuyuki Kuwabara, Masahito Yoshida, Hideki Ogura

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Abstract

There is provided an inkjet printing head carrying a sub-tank from which accumulated gases can be easily discharged. The inkjet printing head includes a sub-tank which has a movable section constituted by a deformable film sheet, a spring for generating a negative pressure, and a supply/discharge channel for supplying ink and discharging accumulated gases. The sub-tank is intermittently supplied with ink from a main tank and reserving the ink. The supply/discharge channel is provided in a position where it does not interfere with the movable section and the spring, e.g., in a frame of the sub-tank. The supply/discharge channel is preferably formed in an upper part of the sub-tank, e.g., a ceiling section of the sub-tank.

Claims10

Dependent claims

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.

2 more elements

Dependencies are inferred from the claim text.