PURPOSE: To prevent the occurrence of an accident such as damage of ink jet head due to a change in a volume of ink, by a method wherein a variable wall, being deformed corresponding to an ink quantity in an ink jet head, is mounted to an ink feed chamber.
CONSTITUTION: An ink feed chamber 31 is formed with a substrate 30 and a flexible film 32 adhered to the substrate 30, and the flexible film 32 is provided with a bagform part 32a. A volume V0 occupied by the bagform part is set so that it meets a formula, where V1 is an ink volume in a jet head, (r) is a volume expansion coeffcient of ink liquid, Δt is an external environment temperature change, and V2 is a volume of ink evaporated from the inside of the jet head. This prevents damage of the jet head even if a change in an ink volume is produced due to an environment temperature change and evaporation of ink. Finally, a variable wall may be installed to a place other than the ink feed chamber 31.
KIMURA YOSHIAKI
MURAKAMI SEIKI
| JPS5675865A | 1981-06-23 | |||
| JPS5249034A | 1977-04-19 | |||
| JPS56106869A | 1981-08-25 | |||
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