Matrix print head impact energy control

Details Matrix print head impact energy control Matrix print head impact energy control

B - Operations, Transporting

41

J

354/236.11

B41J 9/48 (2006.01) B41J 2/30 (2006.01)

Patent

CA 1083487

Abstract of the Disclosure A matrix printer impact energy control is disclosed wherein the impact energy supplied to the drive solenoids of matrix print heads is maintained substantially constant not- withstanding variations in the printer power supply output. The hammer power supply voltage is monitored and coupled, together with a derived reference voltage to a summing amplifier which is then pulse width modulated to produce a pulsed hammer drive output having constant print energy. The print energy may be increased to provide multiple copy printing capability. A single impact energy control circuit controls all of the print hammers of each print head. Synchronization of the pulse width modulator is provided by a variable frequency clock from which the pulse width modulator trigger frequency is derived.

263596

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