Solenoid controlling apparatus

Typewriting machines – Including type-set-assemblage mounted on carrier and... – Imprint by movement of record-medium against type-face

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Details

361154, B41J 950, B41J 938

Patent

active

051201429

ABSTRACT:
In a printing device employing a solenoid for driving a printing hammer, provided are switching member for ON/OFF operating electric current flowing through the solenoid coil, voltage generating member for generating voltage in accordance with the electric current, converting member for converting the generated voltage to a digital value, chopping member for comparing the converted digital value with a predetermined comparison value, while for turning on the switching member when the converted value is smaller than the predetermined comparison value and turning off the switching member when the converted value is larger than the predetermined comparison value, detecting member for detecting voltage relating to a driving operation of said solenoid, and controlling member for controlling the predetermined comparison value so as to be varied in an amount based upon the detected voltage. Thus, the current flowed through the solenoid is controlled so as not to be largely varied.

REFERENCES:
patent: 3909681 (1975-09-01), Campari et al.
patent: 4407193 (1983-10-01), Hall
patent: 4745514 (1988-05-01), Takeshima
European Search Report Appl. No. EP 90307822.8.

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