Fixed head thermal printer.

摘要

A fixed head thermal printer has a plurality of printing elements defining a line of print. Power is supplied to blocks of elements sequentially with a number of blocks receiving power simultaneously, that number being determined in accordance with the number of dots to be printed. The width of the paper is detected and elements not adjacent the paper are prevented from operating. In one embodiment, slack in a loop of paper from a roll is detected to control the driving soeed of the roll.