Label printer with test pattern for price and bar codes

摘要

A label printer includes a printing head having a plurality of heating elements arranged in a direction perpendicular to the feed direction of a label, and a data generator for supplying a plurality of article data, including a bar code and a price, to the printing head in the ordinary printing mode. In the test mode, the data generator supplies to the printing head test pattern data indicative of a plurality of test patterns which are printed in substantially the same positions as the printing positions of those plurality of article data, each of the test patterns having an area of substantially the same size as the largest one of the areas occupied by the article data to be printed in the same printing position.