Printer with protection from discharge line disconnection

Details Printer with protection from discharge line disconnection Printer with protection from discharge line disconnection

1990-10-03

1992-05-19

Wiecking, David A.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

400 54, B41J 230

Patent

active

051142520

ABSTRACT:
In a printer that includes a carriage section having a print head with a plurality of drive coils provided therein, and a control unit having a power supply circuit supplies drive power to the print head, and a cable having conductors for connecting the control unit and the carriage section, a drive power supply node and discharge node in the carriage section are connected to an output terminal of the power supply circuit in the control unit via the cable. Drive power for the plurality of drive coils is supplied from the terminal of the power supply circuit through the cable and the drive power node, and magnetic energy accumulated in the drive coils is discharged through the discharge node and through the cable to the output terminal of the power supply circuit. Printer protection is achieved by detecting, in the carriage section, whether the discharge node is satisfactorily connected with the terminal of the power supply circuit. This is determined in accordance with the magnitude of the voltage applied to the discharge line. The printing operation is prevented if an unsatisfactory connection is detected.

REFERENCES:
patent: 4411540 (1983-10-01), Nozaki
patent: 4540295 (1985-09-01), Okunishi
patent: 4553867 (1985-11-01), Nakai
patent: 4705412 (1987-11-01), Matsumoto
patent: 4978239 (1990-12-01), Alexander

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