PURPOSE: To achieve improvement of sealing stability of a connection part by a method wherein when an ink supply side joint part is connected to an ink tank side joint part, degree of freedom is provided in a rotary direction to a central axis of the joint part which enables an ink tank to be displaced.
CONSTITUTION: Though two ink supply paths and one ambient open path are required to be connected to each other at a joint part 95, in order to obtain certain connection at this part, an ink tank 94 is held leaving a gap part 97 in boxes 93a, 93b so that the ink tank 94 can be free moved by an appropriate gap. Especially when a plurality of joints are connected to each other, not only degree of vertical and lateral freedom but also degree of rotary freedom come to be required. Therefore, in order to obtain degree of rotary freedom to a central axis of the joint part 95, by supporting the ink tank 94 with a gap part 97a provided to both end parts of the ink tank 94 and a waste ink absorbing material 96 of a soft felting field, the ink tank 94 is held free rotatively by a slight gap. Thereby, certain connection without shift in position becomes capable of being performed.
OKUBO AKIO
WATABE FUMIHIKO
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