Sheet housing device, sheet feeding device, and image forming apparatus

A sheet housing device comprising:

• a bottom plate on which sheets are stacked;
• a pressure spring to bias the bottom plate toward a feeder in a biasing direction to feed the sheets stacked on the bottom plate in a feeding direction;
• an auxiliary spring to bias the bottom plate in the biasing direction;
• one or more regulating members including at least one of:
• a side fence to regulate a position of the sheets on the bottom plate in a width direction orthogonal to the feeding direction;
• or
• an end fence to regulate a position of the sheets on the bottom plate in the feeding direction;
• a pressure lever disposed between the auxiliary spring and the bottom plate, the pressure lever displaced by the auxiliary spring in the biasing direction to bias the bottom plate toward the feeder;
• and
• a switch to switch the pressure lever between:
• a biasing state in which the auxiliary spring biases the bottom plate toward the feeder via the pressure lever;
• and
• a restricted state in which the switch restricts a displacement of the pressure lever in response to a position change of the one or more regulating members.