Patent ID: 8297862
Filing Date: 2012-10-30
Classification: B41J

Abstract:
1. An image forming apparatus which includes a printing medium-feeding motor to drive a feeding unit capable of feeding a printing medium, comprising: a velocity sensor to measure a rotation amount of the motor; a Pulse Width Modulated (PWM) driver to generate a PWM signal to drive the motor; and a controller to detect a current position of the printing medium on the basis of the rotation amount of the motor, the controller to control the PWM driver such that the PWM driver outputs a first PWM signal value to accelerate the motor to a first velocity, a second PWM signal value to maintain the motor at the first velocity, a third PWM signal value to decelerate the motor to a second velocity, a fourth PWM signal value to maintain the motor at the second velocity, and a fifth PWM signal value to decelerate the motor such that the motor stops when the printing medium is disposed at a target position, the fifth PWM signal value being a positive value that creates an electromotive force in the printing medium-feeding motor that is less than a kinetic frictional force resisting against the printing medium-feeding motor, after the printing medium reaches the target position, so that the printing medium-feeding motor stops rotation, and the controller maintains the lowered PWM signal value.