Algorithm for Magnetic Sensing of Print Actuator Dynamics
Original Publication Date: 1986-Mar-01
Included in the Prior Art Database: 2005-Mar-08
Calculating hammer impact force and contact-time from position information derived from a magnetic pickup eliminates the need for separate sensors for position and impact force measurement. It is becoming common in the manufacture and servicing of impact printers to measure the flight time and impact force of a hammer. Position and velocity measurements are mandatory for feedback control of impact printers; the same measurements can be used to predict the remaining variables, such as impulse force, flight time, and contact time. Sensor-based data can be extended to provide the hammer flight- time by predicting impact parameters using momentum principles. Consider Fig. 1. The print hammer is deposited with two magnetic strips A and B separated by a known distance "d.