Piezoelectric print head control device using adjacent dot data
US5423618A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 14, 1994 |
| Grant date | Jun 13, 1995 |
| Priority date | — |
| Expiry date | Sep 14, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/295
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.