Patent ID: 6082911
Filing Date: 2000-07-04
Classification: B41J

Abstract:
A method of judging a propriety of a relative positional relation between a printing operation in a forward direction and a printing operation in a backward direction on a recording sheet when a printing head of reciprocating type prints in both of the forward and backward directions, said method comprising:a printing process of printing a reference pattern on one of two printing regions adjacent to each other on the recording sheet, as the printing head moves in one of the forward and backward directions, and printing a comparison pattern, which is to become identical to the reference pattern, on the other of the two printing regions as the printing head moves in both of the forward and backward directions; anda judging process of comparing the printed comparison pattern with the printed reference pattern, judging whether or not the printed comparison pattern is substantially identical to the printed reference pattern on the basis of a predetermined criterion, and judging that the relative positional relation is proper if the printed comparison pattern is judged to be substantially identical to the printed reference pattern.