Patent ID: 6999713

Claim:
A method for setting the rotational speed of register rollers in an image forming apparatus for forming an image by driving a recording medium transporting member while feedback control is carried out, the image forming apparatus comprising an image carrier for carrying a toner image, the register rollers for transporting recording media at a predetermined timing by rotationally driving the register rollers, the recording medium transporting member for carrying the recording media transported from the register rollers on its surface to pass the recording media by a transfer area opposing the image carrier, means for driving the recording medium transporting member so that its surface moves, means for detecting the speed of movement of the surface of the recording medium transporting member, and controlling means for feedback controlling the driving means based on the detection by the detecting means so that the speed of movement of the surface of the recording medium transporting member is kept at a target value equal to the speed of movement of the surfaces of the register rollers, the method comprising the steps of: measuring the speed of movement of the surface of the recording medium transporting member prior to replacing at least one of the driving means, the recording medium transporting member, and the register rollers with respect to the body of the apparatus, in which when the driving means is replaced, at least one of or all components of the driving means are replaced, storing the measured speed of movement of the surface of the recording medium transporting member, measuring the speed of movement of the surface of the recording medium transporting member after the replacement, comparing the speed of movement of the surface of the recording medium transporting member before the replacement with that after the replacement, and setting a value equal to the product of a set rotational speed of the register rollers and the ratio of the surface movement speed after the replacement to the surface movement speed before the replacement as the rotational speed of the register rollers for a subsequent image forming operation if the surface movement speeds before and after the replacement differ.