a conduit starts the programmable controller 14 receives as an input the pressure measurement issuing from the vacuum switch 13 and controls at its output each of the three solenoid valves 9 10 11 the capture interface 15 is also connected to the input of the programmable controller 13 and makes it possible to enter in the internal memory of the latter threshold pressure values necessary for the functioning of the device these values can be modified any time during the functioning of the device the programmable controller 14 taking account of the new values dynamically the first solenoid valve 9 connects in the idle state the related reserve 12 to an input of the second solenoid valve 10 and in the actuated state the related reserve 12 to the conduit 8 connected to the ink reserve 1 the second solenoid valve 10 connects in the idle state an input of the third solenoid valve 11 to the conduit issuing from the first solenoid valve 9 and in the actuated state the same input of the third solenoid valve 11 to the conduit 8 connected to the ink reserve 1 the third solenoid valve 11 connects in the idle state the conduit issuing from the second solenoid valve 10 to the supply 7 of gas under negative pressure and in the actuated state the conduit issuing from the second solenoid valve 10 to the supply 6 of gas under pressure thus when the three solenoid valves 9 10 11 are in the idle state the configuration is as follows the supply of gas under negative pressure 7 is connected to the related reserve 12 by means of the second 10 and third 11 solenoid valves the conduit 8 connected to the ink reserve 1 is itself connected.