Printer system with encoder filtering arrangement and method for high frequency error reduction
US6609781B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 2000 |
| Grant date | Aug 26, 2003 |
| Priority date | — |
| Expiry date | Jan 15, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J19/207
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A printhead firing control system for an inkjet printer includes a printhead mounted for movement across a paper path and an encoder for producing a digital output signal indicative of movement of the printhead. A filter circuit is connected to receive the digital output signal for filtering the digital output signal to remove frequency variations which meet at least one predetermined parameter, thereby providing a filtered digital signal. A fire-pulse generation circuit receives the filtered digital signal from the filter circuit and produces printhead heater resistor drive pulses based at least in part upon the filtered digital signal. This arrangement provides for improved printing accuracy by eliminating frequency changes in the digital encoder signal which may erroneously be caused by mechanical vibrations or other noise within the printer. An improved digitally controlled oscillator construction is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.