Head moving mechanism and printing apparatus

A printing apparatus comprising:

• a rotatable roller;
• a first printing head that dispenses a first liquid in a first direction onto a recording medium wound around a surface of the roller;
• a second printing head that dispenses a second liquid in a second direction inclined with respect to the first direction onto the recording medium wound around the surface of the roller;
• and
• a head moving mechanism that drives the first printing head and the second printing head,
• the head moving mechanism including
• a first holding unit that holds the first printing head so as to move together with the first printing head in the first direction;
• a second holding unit that holds the second printing head so as to move together with the second printing head in the second direction;
• a rotary actuator that generates rotative driving force for moving the first printing head and the second printing head;
• a cam shaft to be driven to rotate by the rotative driving force from the rotary actuator;
• a cam attached to the cam shaft;
• a first cam follower an end portion of which is attached to the first holding unit and the other end portion of which includes a first sliding-contact surface disposed in sliding contact with the cam;
• and
• a second cam follower an end portion of which is attached to the second holding unit and the other end portion of which includes a second sliding-contact surface disposed in sliding contact with the cam,
• the first cam follower and the second cam follower being each displaced by rotation of the cam so as to move the first holding unit together with the first printing head and move the second holding unit together with the second printing head, while the first sliding-contact surface and the second sliding-contact surface are located adjacent to each other and simultaneously in sliding contact with an outer circumferential surface of the cam.