Adaptive print hammer damper

Details Adaptive print hammer damper Adaptive print hammer damper

1984-09-24

1985-09-03

Sewell, Paul T.

Typewriting machines

Including type-set-assemblage mounted on carrier and...

Including type-faces movable relative to type-face-carrier

101 9302, 4001572, 400167, 361152, B41J 942

Patent

active

045389306

ABSTRACT:
A circuit for controlling the hammer velocity of an impact printer is described. A velocity sensor generates a signal which is a function of hammer position. This is compared to a reference voltage, and a drive pulse is generated if a velocity correction is needed. The sensor can be located at the backstop and used to control the hammer velocity toward zero as the position nears the backstop. If the sensor is located at the backstop, the sensor output will remain constant for following velocity as its position approaches the backstop, allowing a constant reference voltage. A table look-up can be inserted in the circuit to supply corrections, for a sensor that does not have a position dependent velocity output.

REFERENCES:
patent: 4192230 (1980-03-01), Blom et al.
patent: 4429342 (1984-01-01), Heider

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