an inkjet printer includes a printer chassis , an inkjet head attached to the printer chassis , a belt connected to the inkjet head , a motor , and an ink collection device . the motor is secured to the printer chassis and meshes with the belt . the motor drives the belt in a first moving direction or a second moving direction to move the inkjet head back and forth . the ink collection device is secured to the printer chassis and includes a fan module driven for bringing undeposited ink particles generated in printing . the fan module is configured to be rotated by the belt in a single constant direction notwithstanding the direction of movement of the belt .