US 12,240,250 B1
Method for feedback control of the temperature of an ink in inkjet printing
Gerald Hauptmann, Bammental (DE); and Ernst-Christian Maschler, Heidelberg (DE)
Assigned to Heidelberger Druckmaschinen AG, Heidelberg (DE)
Filed by Heidelberger Druckmaschinen AG, Heidelberg (DE)
Filed on Aug. 21, 2024, as Appl. No. 18/810,769.
Claims priority of application No. 10 2023 122 268.6 (DE), filed on Aug. 21, 2023.
Int. Cl. B41J 2/195 (2006.01); B41J 2/02 (2006.01); B41J 2/045 (2006.01); B41J 2/175 (2006.01); B41J 2/18 (2006.01)
CPC B41J 2/195 (2013.01) [B41J 2/04563 (2013.01); B41J 2/17596 (2013.01); B41J 2/18 (2013.01); B41J 2002/022 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method for feedback control of the temperature of an ink in inkjet printing, the method comprising:
pumping the ink through a supply line and a return line of an ink distributor and through print heads supplied in parallel with the ink and disposed between the supply line and the return line;
comparing a temperature actual value with a predefined temperature setpoint value and calculating a manipulated variable for a setpoint value of an ink heater from a setpoint/actual value deviation;
operating a flow sensor between the supply line and the return line and in parallel with the print heads, and using the flow sensor to measure a flow of the ink or generating a measurement signal dependent on the flow; and
using a respectively predefined characteristic curve to convert the flow or the measurement signal into a temperature auxiliary value and using the temperature auxiliary value as the temperature actual value or as the temperature setpoint value for the feedback control.