Patent ID: 7904000
Filing Date: 2011-03-08
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a first photoconductor group constituted of one or more photoconductors used for forming a mono-color image; a second photoconductor group constituted of one or more photoconductors used for forming a full-color image with the first photoconductor group together; a first drive section for driving the first photoconductor group to rotate the photoconductor(s) thereof; a second drive section for driving the second photoconductor group to rotate the photoconductor(s) thereof; a first drive control section for controlling the first drive section; a second drive control section for controlling the second drive section, and a deceleration measuring section for measuring respective degrees of deceleration when the first and second photoconductor groups rotate under their own inertias with a drive thereof being stopped, wherein each photoconductor constituting the first and second photoconductor groups is engaged to the corresponding drive section thereto with rotational phases being matched with one another; the rotational phases of the first photoconductor group and the second photoconductor group are adjusted to be matched therebetween; and the first and second drive control sections determine a control pattern for decelerating both the first and second drive sections so that a degree of deceleration to be applied at a time when the first and second photoconductor groups stop rotating becomes equal to or slower than the slowest one among the degrees of deceleration measured by the deceleration measuring section.