Realtime Feedback Control for Actuator
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
Realtime feedback techniques can be employed to improve hammer impact force variations for an impact printer. By using current pulses to control hammers from hitting backstops, settling time can be shortened and higher speed operation is achieved. In conventional impact printing, an electrically driven hammer impacts the paper and ribbon to generate a character or a dot. After printing, it returns to a backstop, dumps all the remaining energy, and settles to its initial condition, ready for the next print command. For an impact printer, it is desirable to have a high repetition rate to achieve high speed, and minimal impact-force variation and flight-time variation to achieve high quality printing.