Electricity: motive power systems – Positional servo systems – Multiple mode systems
Patent
1983-09-27
1985-11-05
Dobeck, B.
Electricity: motive power systems
Positional servo systems
Multiple mode systems
318594, 318619, 318561, G05B 1118
Patent
active
045516642
ABSTRACT:
In a rotary printer control system, a dual mode servo for controlling the velocity and position of a rotary print wheel and a print wheel carriage is normally operated at a relatively high gain value. When the servo is switched from the velocity mode to the position mode, the length of time the servo remains in the position mode is monitored and, if this exceeds a predetermined maximum time period, the gain of the servo loop is switched to a relatively low value in order to reduce oscillations of the print wheel or carriage about the HOME position. The gain reduction is accomplished by inserting a supplemental R-C network in parallel with the high gain R-C network, and the range or ratios of the relatively high gain to the relatively low gain values is from about 10 to about 30.
REFERENCES:
patent: 3721882 (1973-03-01), Helms
patent: 4347470 (1982-08-01), Kohzai et al.
patent: 4486693 (1984-12-01), Hamati et al.
Lin Frank W.
Wong Harvey C.
Dobeck B.
Mechatron Systems, Inc.
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