Hammer bank velocity during movement through a print span is sensed, and further kinetic energy is supplied by the servo system as required to compensate for friction losses, braking effects during printing, and {HEAD ~ other causes} of {TAIL ~ variation} in hammer bank speed 
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Hammer bank velocity during movement through a print span is sensed , and further kinetic energy is supplied by the servo system as required to compensate for friction losses , braking effects during printing , and { HEAD ~ other causes } of { TAIL ~ variation } in hammer bank speed
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