| 摘要 |
PROBLEM TO BE SOLVED: To stabilize an emitting flow rate of ink by controlling the flow rate of an ink pump to a constant prescribed flow rate after the completion of printing to measure equilibrium pressure and the circumferential temp. SOLUTION: The circumferential temp. TS is measured before printing is started (S1) and, when the absolute value of the difference between the circumferential temp. T and the circumferential temp. TM at a time of the completion of previous printing is equal to or more the prescribed temp. differenceΔTr (NO in S2), the circumferential temp. TS is used to calculate estimated equilibrium pressure PS being the estimated value of the equilibrium pressure PO equilibrated with a prescribed flow rate QO according to relational expression PS=-alog TS+b (a and b; constant) of pressure and temp. (S3) and an ink pump is pressurized up to the estimated equilibrium pressure P (S4). After printing is completed (S6), constant flow rate control is performed on the basis of the prescribed flow rate QO (S7) and the circumferential temp TE is measured (S8) to measure equilibrium pressure PE (S9) and the circumferential temp. TE and the equilibrium PE are stored as the circumferential temp. TM and the equilibrium pressure PM at a time of the completion of previous printing (S12). |
