Patent ID: 8335449
Filing Date: 2012-12-18
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image forming section including a plurality of rotary bodies to form an image by rotation of the rotary bodies; a plurality of DC motors for driving each part of the image forming section; and a drive control section for controlling the DC motors, each of the DC motors being adapted to drive at least one of the rotary bodies, wherein the apparatus comprises: an activation time storage section for storing an activation time required for each of the DC motors to reach a target speed from activation start thereof; a rotation storage section for storing information about ones of the DC motors, the ones being needed to be rotated in each print mode; a preparation time storage section for storing a preparation time required for a part of the image forming section excepting the DC motors to become ready to start image formation in each print mode; a reference time determining section for determining, when a print job occurs, an image start reference time based on the preparation time stored in the preparation time storage section according to a print mode of the print job, an activation control section for: an actual activation time measuring section for measuring an actual activation time of each of the DC motors to be activated by the activation control section; an activation time updating section for updating the stored content of the activation time storage section based on a measurement result of the actual activation time measuring section, the activation control section being adapted to determine an activation start time of each of the DC motors based on the activation time updated by the activation time updating section for a next print job; a door for opening and closing a part of an outer surface of the apparatus; an initial activation time storage section for storing an initial value of the activation time of each of the DC motors; a door sensor for detecting an opening and closing operation of the door; and an initializing section for initializing the stored content of the activation time storage section by the stored content of the initial activation time storage section when the opening and closing operation of the door is detected.