Inkjet printer with variable size tanks

An inkjet printer comprising:

• a main ink tank configured to store ink;
• a subtank configured to store the ink supplied from the main tank and to be connected to the main tank when the ink is being supplied and to be disconnected from the main tank when the ink is not being supplied, the subtank having an expandable and contractible bellows portion;
• a recording head configured to eject the ink supplied from the subtank onto a recording medium;
• and
• at least one deformation-preventing member configured to contact an outer surface of the bellows portion and configured to prevent the subtank from bulging in a direction intersecting with an expanding and contracting direction in which the subtank expands or contracts,
• wherein the at least one deformation-preventing member is supported by the bellows portion such that:
• the at least one deformation-preventing member surrounds an outermost portion of the bellows portion, and
• the at least one deformation-preventing member moves together with the bellows portion when the subtank expands and contracts.

A deformation-preventing member comprising:

• an outer portion;
• and
• an inner portion,
• wherein the inner portion is configured to contact an outer surface of a bellows portion of an ink tank, said deformation-preventing member configured to prevent the ink tank from bulging in a direction intersecting with an expanding and contracting direction in which the ink tank expands and contracts,
• wherein the at least one deformation-preventing member is configured to be supported by the bellows portion such that:
• the at least one deformation-preventing member surrounds an outermost portion of the bellows portion, and
• the at least one deformation-preventing member moves together with the bellows portion when the ink tank expands and contracts.