Method and apparatus for controlling escapement

Details Method and apparatus for controlling escapement Method and apparatus for controlling escapement

1984-05-29

1986-05-20

Pieprz, William

Typewriting machines

Carriage or carriage-moving or movement-regulating mechanism

Carriage-feed mechanism

400328, 400903, 318696, B41J 1950

Patent

active

045897905

ABSTRACT:
A method and apparatus for minimizing escapement positioning error by matching the move sequence of a print carrier to the mechanical system dynamic characteristics without the use of a feedback sensor are described. A plurality of constant velocity signals are provided for driving the print carrier to the next print position. The sequential velocity signals comprise an acceleration velocity signal and a deceleration velocity signal, the duration of which are dependent upon the damped natural frequency of the print system. For long escapement moves, a slew velocity command is provided between the acceleration and deceleration velocity commands so as to maintain the velocity of the print carrier at the amplitude it had attained at the conclusion of the acceleration velocity signal. The relative amplitudes of the acceleration, slew and deceleration velocity signals are a function of the damping ratio of the printer system.

REFERENCES:
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patent: 4147967 (1979-04-01), Aiena
patent: 4156105 (1979-05-01), Arene et al.
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patent: 4254371 (1981-03-01), Scholten
patent: 4258622 (1981-03-01), Estraband et al.
patent: 4293233 (1981-10-01), Hoffman
patent: 4318625 (1982-03-01), Survant
Survant, "Compensation for Natural Frequency Variation", IBM Technical Disclosure Bulletin, vol. 22, No. 9, p. 4135, 2/80.
Kulterman, "Electrical Damping for . . . Motor", IBM Technical Disclosure Bulletin, vol. 21, No. 2, pp. 445-447, 7/78.

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