| 摘要 |
PURPOSE:To regulate a printing timing in the bidirectional printing of a dot matrix serial printer by employing a plurality of resistors, diodes, and selectors for nozzles having different ink particle injecting directions, and selecting an arbitrary one resistor by the selector. CONSTITUTION:A printing timing generating pulse signal (PO) generated in response to a preset printing density is input to a frequency two divider 2, and divided pulse (Pin) is input to a pulse edge delay circuit 4. The delay time of a pulse edge delay circuit is regulated to the falling edge timing ([Pts2] t3, t5) of the pulse divided in frequency by the frequency two divider, the falling edge timing ([Pts1] t2, t6) of the output signal is moved forward or rearward to regulate the printing timing of a nozzle for injecting ink in a certain injecting direction (or injecting wire) and a nozzle for injecting ink in different injecting direction thereto (or injecting wire). |
