1.前言用电话线传输信息和信息处理系统的普及带来了信息量的飞跃增长,因而强烈要求数据传输高速化。为此,作为适合于4800位/秒数据传输系统的通讯终端装置,研制了中速行式打印机。这台中速行式打印机,把印字条件的研究成果做为重点,应用了其中的二、三项研究结果,采用了飞打式印字方式和字鼓形式。为了满足通讯终端装置所要求的小型轻便、造价低、可靠性高等要求,使用了字鼓移动机构、装有转动型字锤的击打部件、高速弹簧离合 1. Preface The widespread use of telephone lines for the transmission of information and information processing systems has led to a dramatic increase in the amount of information and has strongly demanded the speeding up of data transmission. To this end, as suitable for 4800 bit / s data communications system terminal equipment, developed a medium-speed line printer. This medium-speed line printer, the printing conditions as the focus of research results, the application of one of the two or three of the findings, the use of the fly-type printing method and the drum style. In order to meet the requirements of small size, light weight, low cost and high reliability required for a communication terminal device, a drum moving mechanism, a striking member equipped with a rotary hammer, a high-speed spring clutch