Solenoid impact print hammer with uniform free flight time

Details Solenoid impact print hammer with uniform free flight time Solenoid impact print hammer with uniform free flight time

B - Operations, Transporting

41

J

101/94

B41J 9/00 (2006.01) B41J 9/48 (2006.01)

Patent

CA 1166511

SOLENOID IMPACT PRINT HAMMER WITH UNIFORM FREE FLIGHT TIME ABSTRACT OF THE DISCLOSURE In an impact printer including a print wheel having a plurality of selectable character type bearing elements for respectively printing a plurality of characters, said print wheel being rotatable for selectively position- ing selected type elements in successive print positions, impact means impellable against the selected elements to drive said elements against the printing medium and means for impelling the impact means against said selected type element, the present invention provides the improve- ment comprising the combination of means for sensing the flight time of the impelled impact means until impact by sensing variations in the velocity of said impact means, means for comparing the sensed flight time to a predeter- mined ideal flight time, and means for selectively varying the amplitude of the current to the impelling means to adjust the sensed flight time to equal the ideal flight time. AT9-79-037

374644

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