Dot matrix printer and control method thereof

Abstract

The invention provides a dot matrix printer and a control method thereof. In each of columns from the start column to the final column of a row of print data (dot-row data), a control part of the dot matrix printer sequentially takes 24 recording lines as a detection target and determines whether a sawtooth pattern C is printed or not. Then, a special position image A detection is determined if the number of the continuous columns each having more than 2 recording lines each printing the sawtooth pattern C in at least one position of two continuous dot positions is more than 12. Then, a drive mode setting a relatively low head coil drive frequency f is selected to lower down the printing speed. In this way, the recording lines can be prevented from hooking an ink ribbon due to magnetic disturbance among head coils.

Description

technical field [0001] The present invention relates to a dot-matrix printer equipped with a recording head that drives recording lines to form dots on recording paper and a control method thereof. Background technique [0002] Dot-matrix printers are used in various fields with high reliability and overlapping printing on copy paper as the main purpose. A dot matrix printer includes a recording head having a plurality of wire pins. The recording head has a head coil (electromagnet coil) for driving the recording line for each recording line, and the recording line is selectively protruded by selectively driving the head coil. The dot-matrix printer scans the carriage carrying the recording head along the paper width direction (head scanning direction) of the recording paper, and makes the recording line of the recording head selectively collide with the recording paper through the ink ribbon, so as to print on the recording paper. Dots are formed on it to record informati...

AI Technical Summary

Problems solved by technology

Because of the poor response of the recording line, the ink ribbon hangs on the recording line when the recording head moves.

[0007] In order to prevent the ink ribbon from being hung up due to the poor response of the recording line caused by magnetic interference, although it is considered to reduce the driving frequency to reduce the influence of the driving current of the adjacent head coil, but because the printing speed becomes slower, there is a problem during printing. The problem of reduced throughput

In particular, in order to prevent burnout of the head coil, when the control such as increasing the driving interval of the head coil is performed at the same time, the decrease in throughput during printing becomes a problem.

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