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一、前言目前,世界各发达国家的电子计算机发展十分迅速,尤其是微型电子计算机的生产发展速度更是突飞猛进,对社会经济各个领域产生了巨大的影响。1973年,微型电子计算机世界年产量仅为2万5千台,1977年为100万台,1980年为2800万台,1982年的产量超过6130万台可见微型电子计算机的发展是何等迅速。作为电子计算机主要外围设备的针型打印机的生产增长率也是十分惊人的,据有关资料报导,日本针型打印机生产的年增长率为24%,82年一季度的产量超过275万台。针型打印机具有结构简单,印字清晰,成本低等优点,因此针型
I. Preface At present, the development of electronic computers in developed countries in the world is very rapid. In particular, the production and development of miniature electronic computers are making rapid progress and have a tremendous impact on all fields of social economy. In 1973, the annual output of the miniature computer world was only 25,000 units, 1 million units in 1977, 28 million units in 1980 and more than 61.3 million units in 1982. How quickly can we see the development of miniature computers? The production growth rate of needle printers, which are the main peripherals of computers, is also staggering. According to relevant information, the annual growth rate of the production of needle printers in Japan is 24% and the output in the first quarter of 82 exceeded 2.75 million units. Needle printer has the advantages of simple structure, clear printing, low cost, etc., so the needle type