Opening/closing detection mechanism and image forming apparatus

An opening/closing detection mechanism detecting an opened/closed state of a door portion, comprising:

• an apparatus body portion having an approximately rectangular parallelepiped shape and accommodating internal devices;
• a first door portion which is provided on one side surface of the apparatus body portion and an upper end thereof can be opened/closed with respect to the apparatus body portion with a lower end thereof as a fulcrum, and which is brought into an opened state by pulling down the upper end to a front side;
• a second door portion provided on a side surface adjacent to the side surface on which the first door portion is provided and an upper end thereof can be opened/closed with respect to the apparatus body portion with a lower end thereof as a fulcrum, and which is brought into an opened state by pulling down the upper end in a horizontal direction;
• and
• an interlock mechanism switching whether electric power required for an operation of the internal devices is supplied or interrupted according to the opened/closed state of the first door portion and the second door portion,
• wherein the interlock mechanism contains
• a switch has a projection portion, which is biased in a direction opposite to a pressing direction by the first door portion and for detecting a first state by pressing by the first door portion, and switches whether electric power required for the operation of the internal devices is supplied or interrupted according to the first state or a second state to be detected,
• a plate-like portion having a plate shape, moving in synchronization with the opening/closing operation of the first door portion, and pressing the projection portion when the first door portion is in a closed state,
• a bulged portion provided on the second door portion and abutting on a rear region located on a side opposite to the first door portion with respect to a region where the projection portion is provided of the switch when the second door portion is in a closed state, and
• a rocking mechanism rocking the switch in an opening/closing direction of the first door portion according to the opened/closed state of the second door portion.