Piezoelectric print head control device using adjacent dot data

Details Piezoelectric print head control device using adjacent dot data Piezoelectric print head control device using adjacent dot data

1994-09-14

1995-06-13

Wiecking, David A.

Typewriting machines

Including type-set-assemblage mounted on carrier and...

Imprint by movement of record-medium against type-face

400166, 40012416, B41J 2295

Patent

active

054236185

ABSTRACT:
The present invention provides a print head control device for a wire dot printer, capable of preventing the occurrence of ghost dots to enable the wire dot printer to print characters and the like with a high print quality. The print head control device comprises a print head driving circuit for charging and discharging piezoelectric elements to advance and retract a printing wire, and a print head control circuit for controlling the print head driving circuit. The print head control circuit comprises dot detecting units for deciding if a dot to be printed in the next printing cycle is a single dot, the head dot of a row of consecutive dots, the last dot of a row of consecutive dots or an intermediate dot of a row of consecutive dots, charging/discharging period setting units for setting discharge periods respectively for printing a single dot, the head dot of a row of consecutive dots, the last dot of a row of consecutive dots and an intermediate dot of a row of consecutive dots, and a control unit for controlling piezoelectric element charging and discharging operation according to a set discharging period and a set discharging period.

REFERENCES:
patent: 5078520 (1992-01-01), Yano
patent: 5167459 (1992-12-01), Yano
patent: 5190383 (1993-03-01), Suzuki

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