IMAGE FORMING DEVICE

PROBLEM TO BE SOLVED: To provide a device controlling the current fed to a transfer section from a constant-current source at a proper value regardless of the magnitude of a printing factor. SOLUTION: The transfer section of an image formation section 10 is formed with a photoreceptor drum 11, a conveying belt 17 conveying a paper sheet 22 in contact with the photoreceptor drum 11, and a transfer brush 15 kept in contact with the back face of the contact face of the conveying belt 17. An initialization electrifying brush 12 uniformly electrifies the photoreceptor drum 11, a writing head 13 exposes the electrified peripheral surface to form an electrostatic latent image, the electrostatic latent image is formed into a toner image by a developing unit 14, and the toner image is transferred to the conveyed paper sheet 22 by the transfer brush 15. A transfer current is fed to the transfer brush 15 by a constant-current source 15-1. A resistive element 15-2 is connected in parallel with the output side and ground side of the constant-current source 15-1. When the printing factor of the transfer image is changed from high to low, the proper transfer current is changed from low to high. The excess current fed from the constant-current source 15-1 is removed via the resistive element 15-2.