| 摘要 |
PROBLEM TO BE SOLVED: To decide in detail presence/no presence of abnormality of a liquid supply system for supplying a liquid to a liquid jetting apparatus. SOLUTION: The control circuit 22 of the liquid jetting apparatus 20 applies a first drive signal to a piezoelectric sensor 35, and detects the amplitude Am1 of an output signal that the piezoelectric sensor 35 responds. When the amplitude Am1 is within a prescribed value, the control circuit 22 decides that the state of a liquid container 10 is "normal", and when the amplitude Am1 exceeds the prescribed value, it decides that the state of the container is "defective detection". When deciding the "defective detection", the control circuit 22 applies a second drive signal to the piezoelectric sensor 35, and then, detects the amplitude Am2 of the output signal that the piezoelectric sensor 35 responds. Consequently, when the amplitude Am 2 is larger than the amplitude Am1, it is decided that "defective detection" is caused by "the mixture of air bubbles", and when the amplitude Am2 is equal to or below the amplitude Am1, it is decided that the defective detection is caused by "malfunction" of a moving plate 16. COPYRIGHT: (C)2009,JPO&INPIT |
