| 摘要 |
PURPOSE: To prevent the irregularity and the deviation of an image caused by pressing a transfer means to an image carrier by specifying the repulsive elastic modulus of the transfer means. CONSTITUTION: This device is constituted of the image carrier (photoreceptor drum) capable of forming an electrostatic latent image, a developing means performing the superposed-development of two or more colors with electrostatically charged toner on the image carrier, the transfer means(transfer roller) for electrostatically collectively transferring the toner image obtained by the development on a transfer material altogether, and a means for pressing the transfer roller to the image carrier. Then, the repulsive elastic modulus of the transfer roller is set to <=70%. In the figure, a chart showing the rotational angle position(0 to 360 deg.) of the photoreceptor drum and the positional deviation (a) and (b) of the photoreceptor drum in a state where the transfer roller is in press-contact with/separated from the photoreceptor drum is expressed. Obviously, it is satisfactory to set the repulsive elastic modulus of the transfer roller to <=70%. Furthermore, it is much more satisfactory to use the transfer roller whose repulsive elastic modulus is 20 to 60% even in the case elasticity is given by adding plasticizer and conductivity is given by adding conductor as the transfer roller to be used. |
