Patent ID: 9278561
Filing Date: 2016-03-08
CPC Classification: B41J

Claim Text:
1. A printing apparatus which prints while reciprocating, by a motor in a predetermined direction, a carriage on which a printhead is mounted, comprising: a gear member configured to be attached to a rotor of the motor; a belt configured to be attached to the carriage, to include unevenness corresponding to teeth of said gear member, and to be suspended to be engaged with said gear member; a storage unit configured to store data of a plurality of signals having different periods, respectively, for suppressing a velocity fluctuation of the carriage when no tooth jumping occurs between said gear member and said belt; a detection unit configured to detect generation of the tooth jumping from the velocity fluctuation of the carriage during movement of the carriage; and a correction unit configured to correct the velocity fluctuation of the carriage by using a signal obtained by shifting phases of the respective signals in the stored data by an amount corresponding to the tooth jumping and combining the signals whose phases are shifted respectively when the tooth jumping occurs.