Preventing coil overheating in line printer hammer banks

摘要

In one embodiment, a method for preventing hammer coils of a line printer hammer bank from overheating during printing includes establishing the maximum allowable temperature threshold of any given hammer coil, monitoring the temperature of all hammer coils during printing, keeping a moving average of dots printed per unit time on each hammer coil, and if one or more coils reach a temperature higher than the threshold, determining the current maximum dot-per-hammer density that the hot coils can print per stroke of the hammer bank that will enable them to cool down adequately from their current temperatures. The rate of printing is restricted to this current established maximum dot-per-hammer density on only those coils which have a temperature at or above the maximum allowable temperature, minus a suitable hysteresis.

主权项

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, TS; 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 TS; 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 TS; 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 TS−H.