Printing apparatus controlling advancement of printing paper, actuation of a hammer, and advancement of an ink ribbon

A printing apparatus for printing on printing paper, comprising:

• carriage means movable relative to a printing paper;
• an ink ribbon mounted on said carriage means for advancement;
• type means mounted on said carriage means for carrying a plurality of type elements;
• a hammer mounted on said carriage means for striking any of said type elements carried on said type means against the printing paper;
• a first pulse motor for advancing the printing paper;
• a second pulse motor for advancing said ink ribbon;
• means for actuating said hammer;
• first pulse generating means for generating a first pulse sequence;
• second pulse generating means for generating a second pulse sequence;
• third pulse generating means for generating a third pulse sequence;
• first selecting means for selecting one of a plurality of amounts of advancement of said printing paper;
• second selecting means for selecting one of a plurality of amounts of advancement of said ink ribbon;
• third selecting means for selecting one of a plurality of time intervals of actuation of said hammer;
• first counting means for counting pulses from said first pulse generating means up to a first set value determined by the amount of paper advancement selected by said first selecting means;
• second counting means for counting pulses from said second pulse generating means up to a second set value determined by the amount of ribbon advancement selected by said second selecting means;
• third counting means for counting pulses from said third pulse generating means up to a third set value determined by the time interval of hammer actuation selected by said third selecting means;
• first control means for starting advancement of said printing paper by said first pulse motor upon selection of one of the amounts of advancement of said printing paper by said first selecting means and for controlling said first pulse motor to advance said printing paper until the count by said first counting means reaches said first set value;
• second control means for starting advancement of said ink ribbon by said ribbon advancing means upon selection of one of the amounts of advancement of said ink ribbon by said second selecting means and for controlling said second pulse motor to advance said ink ribbon unti the count by said second counting means reaches said second set value;
• third control means for starting actuation of said hammer by said hammer actuating means upon selection of one of the time intervals of actuation of said hammer by said third selecting means and for controlling actuation of said hammer by said hammer actuating means until the count by said third counting means reaches said third set value;
• and
• processing means for controlling operation of each of said first, second and third counting means and each of said first, second and third control means.