condition is that the recording was interrupted for five seconds when the power supply of the apparatus was on the second condition is that the recording was interrupted for one hour when the power supply of the apparatus was on and the third condition is that the recording was stopped for 72 hours when the power supply of the apparatus was off the dimensions of each of the 24 discharge openings are 50 u00d7 40 u03bcm and the recording unit in which they are vertically arranged in a line at regular intervals of 0 141 mm was used it has been confirmed that when the signal to emit the ink droplets was applied for five minutes just before the recording is interrupted or stopped the ink droplets were accurately emitted the control was performed in accordance with the flowchart of fig3 as the experimental condition of the embodiment for comparison example 1 the recording was restarted without performing the first and second heating operations nor executing the first and second emitting operations for comparison example 2 in the case of restarting the recording in the recording stop state the signal of the same voltage pulse width and frequency as those of the first heating electrical signal of the embodiment was heated for twenty seconds and the same signals as the electrical signals for the pre ink jet of the embodiment were applied and the heating and pre ink.