| 摘要 |
PROBLEM TO BE SOLVED: To feed liquid of a correct difference feed amount to a head tank.SOLUTION: A liquid consumption amount of a head tank after a first sensor detects a displacement member reaches a given consumption amount, and the drive of a liquid feed pump is started and the filling is begun during printing. Then, the measurement of a drive time t of the liquid feed pump is started, and a drive time t until the first sensor detects the displacement member is obtained. A drive time T of the liquid feed pump when supplying a difference feed amount Vo is calculated by an operation of (Vo/V)×t=T, from the drive time t and the given consumption amount V of the liquid feed pump, and the stored difference feed amount Vo. |
