Image forming apparatus

摘要

There is provided an image forming apparatus including: an image forming unit; a fixing unit; a motor; a transmission device configured to transmit a driving power from the motor with a speed transmission ratio selectable from a first speed transmission ratio and a second speed transmission ratio; and a control unit configured to control the transmission device to set the speed transmission ratio to one of the first speed transmission ratio and the second speed transmission ratio by controlling the transmission device to switch a connection state being set by a connection mechanism into one of a connected state and a disconnected state.

主权项

1. An image forming apparatus comprising:
an image forming unit configured to form an image on a sheet; a fixing unit configured to convey and heat the sheet to fix the image on the sheet; a planetary gear mechanism comprising a first element being configured to receive a first driving power and a second element being configured to receive a second driving power and a third element being configured to compose the first driving power received through the first element and the second driving power received through the second element and to output a composed driving power to the fixing unit, wherein the first element, the second element and the third element are configured by a group of elements comprising a sun gear, a carrier and a ring gear; and a rotation restraint mechanism configured to restrain rotation of the second element while the second element is not receiving the second driving power.