Printing with sensor-based positioning of printing paper

摘要

This printer prints images while accurately positioning image data on printing paper. Printing paper P is guided by guides 29a and 29b and is fed in the course of sub-scanning such that the two side edges thereof are above the left slot 26a and right slot 26b of a platen 26. A carriage 31 equipped with a photoreflector 33 is brought to the position shown by a broken line. The photoreflector 33 is used to detect the presence of printing paper P in the connection 26d between the left slot 26a and downstream slot 26r. The feeding during sub-scanning is stopped and some of the nozzles above the downstream slot 26r start printing images in the upper-edge portion Pf (lower edge in Fig. 1) of the printing paper P when the front edge of the printing paper P is detected by the photoreflector 33.