Patent ID: 8141974

Claim:
A holding drum control apparatus comprising: a holding drum that is rotatable while supporting an object on the outer curved surface of the holding drum; a motor that is supplied with current based on a current profile representing the magnitude pattern of current to rotate the holding drum; a detecting element that detects a rotation state of the holding drum during rotation; and a control unit that is configured to generate a one-rotation current profile, representing the magnitude pattern of current corrected on the basis of the rotation state detected through the detecting element and corresponding to one rotation of the holding drum, and configured to supply corrected current based on the generated one-rotation current profile to the motor to rotate the holding drum, wherein the holding drum control apparatus is a liquid discharge apparatus including a discharging unit that discharges a liquid onto a medium serving as the supported object while the holding drum rotates according to the one-rotation current profile, while the control unit repeatedly supplies the corrected current based on the generated one-rotation current profile to the motor to rotate the holding drum supporting the medium a plurality of times, the control unit allows the discharging unit to discharge the liquid onto the medium in order to print an image, and when at least one of the length of the medium in the rotation direction in which the holding drum rotates, a length of the medium in the axial direction of the holding drum, and a type of the medium is changed, the control unit is configured to generate the one-rotation current profile before the start of printing, and configured to repeatedly supply the corrected current based on the generated one-rotation current profile to the motor to print the image while rotating the holding drum according to the generated one-rotation current profile.