Electricity: motive power systems – Positional servo systems – With particular motor control system responsive to the...
Patent
1993-02-19
1994-03-01
Ip, Paul
Electricity: motive power systems
Positional servo systems
With particular motor control system responsive to the...
360 75, 307 41, 307149, 318560, 364492, G06K 1500
Patent
active
052911144
ABSTRACT:
The disclosed invention achieves a proper speed control of a sheet feeding motor for a serial printer that uses an astable power supply with a simple operation irrespective of variations in power supply voltage. The invention provides a method of and an apparatus for controlling the frequency of a sheet feeding pulse motor for a printer in accordance with the power supply voltage during sheet feeding. The apparatus of the invention is composed of a sheet feeding motor controller for use in a printer, the controller controlling a driving signal used to drive a motor in accordance with the level of a printer power supply voltage within the printer, the controller includes a device for detecting a power supply voltage; a first memory device for storing information representing the characteristic voltage restoration curve of the printer power supply; a second memory device for storing information representing the relationship between a rotational speed of the motor and the plurality of voltages making up the characteristic printer power supply restoration curve; a device for estimating a current power supply voltage on the characteristic restoration curve from the information stored in the first memory device; a device for reading a rotational speed from said second memory device corresponding to the current power supply voltage estimated by said estimating means; and a device for changing the speed of the motor in accordance with the read rotational speed.
REFERENCES:
patent: 3575107 (1971-04-01), McDowell
patent: 4306299 (1981-12-01), Check, Jr. et al.
patent: 5061957 (1991-10-01), Nishikawa et al.
patent: 5189570 (1993-02-01), Maeda et al.
Nishizawa Katsuhiko
Shirotori Hiroshi
Ip Paul
Seiko Epson Corporation
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