Automatic mechanical resonant frequency detector and driver...

Details Automatic mechanical resonant frequency detector and driver... Automatic mechanical resonant frequency detector and driver...

B - Operations, Transporting

41

J

318/5, 101/96.01

B41J 3/02 (1985.01)

Patent

CA 1221872

AUTOMATIC MECHANICAL RESONANT FREQUENCY DETECTOR AND DRIVE FOR SHUTTLE PRINTER MECHANISM ABSTRACT OF THE DISCLOSURE The detected phase difference between a sensed motion velocity signal and an electric motor driving signal is used to drive a phase-locked loop which automatically generates a sinusoidal reference signal having a frequency substantially equal to the instantaneous natural mechanical resonant frequency of the drive mechanisms. The sinusoidal reference signal is then combined with the sensed velocity feedback signal to generate the motor driving signal required to maintain resonant driving conditions. Low frequency compensation is also provided in the velocity control loop. The sinusoidal velocity reference signal is initially generated in digital form by counting clock signal which are caused to occur at a rate corresponding to the desired frequency of the sinusoidal reference signal.

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