Method of printing enlarged or reduced images line by line

摘要

A method of printing images on a sheet of paper (P) by using a line by line printing apparatus (1) which has a plurality of thermal printing heads (2a,2b,2c) arranged at given intervals (Za,Zb,Zc) along a main scanning direction (Hm). The printing heads being simultaneously moved (shifted) along the main scanning direction during printing, such that each head prints a respective portion of one printing line. The apparatus comprises an image sensor (16) for reading the original images to be printed and means for A/D converting the images into digital data corresponding thereto; means (32,33) for selecting the magnification of the image to be printed and means (31) for accordingly scaling the image digital data. The method includes the steps of adjusting the shifting magnitude of the printing heads in dependence of selected magnification and controlling the printing timing of the heads and feeding of the paper in the sub scanning direction. <IMAGE>