The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 13, 1995
Filed:
Sep. 14, 1994
Akio Yano, Kawasaki, JP;
Fujitsu Limited, Kanagawa, JP;
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.