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

1980-06-16

1983-10-04

Coven, Edward M.

Printing

Selective or progressive

Bed and platen machines

101 9303, 400166, 4001573, B41J 792

Patent

active

044071930

ABSTRACT:
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 positioning 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 improvement 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 predetermined 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.

REFERENCES:
patent: 3712212 (1973-01-01), Beery
patent: 4102265 (1978-07-01), Deetz
patent: 4192230 (1980-03-01), Blom et al.
patent: 4232975 (1980-11-01), Kane
patent: 4259903 (1981-04-01), Arendt et al.
Olson, IBM Tech. Discl. Bulletin, vol. 23, No. 1, Jun. 1980, pp. 13-14.
Kane et al., IBM Tech. Discl. Bulletin, vol. 22, No. 12, May 1980, p. 5231.
Mathews, IBM Tech. Discl. Bulletin, vol. 21, No. 12, May, 1979, p. 4763.
Mills et al., IBM Tech. Discl. Bulletin, vol. 15, No. 8, Jan. 1973, p. 2356.

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