Patent ID: 9365060
Filing Date: 2016-06-14
CPC Classification: B41J,H04N

Claim Text:
1. An apparatus comprising: a carriage; an encoder configured to output a signal according to a movement of the carriage; a movement mechanism configured to reciprocate the carriage, wherein the movement mechanism includes a motor, a motor pulley connected to the motor, a driven pulley, and a belt stretched between the motor pulley and the driven pulley, and having two belt sections configured to move between the motor pulley and the driven pulley in opposite directions to each other, along with rotation of the motor pulley, the carriage being supported on either of the two belt sections, wherein the carriage moves from a first side near the driven pulley toward a second side near the motor pulley as a first directional movement and the carriage moves from the second side toward the first side as a second directional movement, and wherein an elongation of the belt in the first directional movement is different from that in the second directional movement; a signal generation unit configured to generate a first control signal, according to a drive instruction and position information based on the signal output from the encoder, and to generate a second control signal having a period used for compensating cogging torque ripples of the motor; and a driving unit configured to drive the motor using the first control signal and the second control signal, wherein, the signal generation unit sets a first value of the period of the second control signal for a maximum constant speed in the first directional movement, and a second value of the period of the second control signal for a maximum constant speed in the second directional movement, respectively, and the first value and the second value are different according to the elongations of the belt.