Patent ID: 8457532

Claim:
Electrophotographic printing apparatus comprising: an image-forming member having a surface on which a latent electrostatic image can be formed and developed for transfer of the developed image to a substrate, a developer for depositing onto the surface of the image-forming member a layer of ink comprising charged ink particles to develop the latent image; an intermediate transfer member for transferring the developed image to the substrate; a voltage supply for generating electric potential between the surface of the intermediate transfer member and the image-forming member such that the developed image formed on the surface of the image-forming member is transferred to the intermediate transfer member; and a controller for controlling the voltage supply to adjust the electrical potential to affect the transfer of ink to the intermediate transfer member from the image-forming member, wherein the controller is arranged to receive a signal indicative of a proportion of ink of the developed image transferred by the intermediate transfer member and cause the voltage supply to adjust the electrical potential in response to the signal.