JPS56103783A - Character printing apparatus of pass book - Google Patents

Abstract

PURPOSE:To enable character printing position to be instructed always accurately by successively light scanning the printing surface of a pass book or the like by a single scanning line in the line direction, deciding the presence or absence of printing and instructing the printing position based on the result of this decision. CONSTITUTION:When a pass book with its required pages held open is inserted into an insertion port, it is conveyed toward a printing head. When a detector 37 detects the trailing edge of the pass book after this, the line signal of the 1st line is outputted, and a line array 41 starts scanning, and outputs the voltage corresponding to the varying densities of the printing surface. The output of this array 41 is applied via an analog processing part 51 and a level comparator 52 to a printing presence or absence detecting part 54. The part 54 detects the presence or absence of printing of every printing line and outputs the result of the detection to a line number memory part 55. The memory part 55 counts the line signals and detects the number of the printed lines. When the array 41 finishes scanning of all the lines, an end signal is outputted from an entire line scanning end decision part 56, and from this, a printing position determining part 57 determines the printing position depending upon the contents of the memory part 55, and instructs the same to a printing position instructing part 58.