Patent ID: 8767027
Filing Date: 2014-07-01
Classification: B41J

Abstract:
1. A method for preventing a hammer coil of a line printer hammer bank from overheating during printing, the method comprising: establishing a maximum allowable temperature of the coil, T deriving a temperature hysteresis H value for the coil; determining an initial value of a hard brake maximum dot-per-hammer density, HCDPHMax, that the coil can print per stroke of the hammer bank that will enable the coil to cool down from the maximum allowable temperature T monitoring the temperature of the coil during printing; flagging the coil as a hot coil, HC, if the temperature of the coil rises to or exceeds T adjusting HCDPHMax based on the rate of cooling of the coil; and adjusting the rate of printing by the coil to HCDPHMax when and for as long as the temperature of the coil remains at or above T