Stacking device and image forming apparatus

An image forming apparatus comprising:

• an apparatus body:
• an image forming unit configured to form an image on a recording material;
• a conveying device configured to convey the recording material:
• a stacking device on which the recording material discharged from the apparatus body is stacked, the stacking device configured to be detachably attached to the apparatus body, the stacking device including a first supporting unit configured to support the recording material from a lower side of the recording material and a second supporting unit configured to support an end of the recording material in an attachment/detachment direction in which the stacking device is attached to and detached from the apparatus body;
• a control unit configured to control conveying of the recording material in the image forming apparatus;
• a first abutting member configured to abut on the recording material stacked on the stacking device;
• and
• a second abutting member configured to abut on the recording material stacked on the stacking device such that an abutting position between the second abutting member and the recording material is located closer to the end supported by the second supporting unit than an abutting position between the first abutting member and the recording material,
• wherein the control unit is configured to control conveying of the recording material in the image forming apparatus so that the conveying of the recording material to the stacking device is stopped when either one of the first abutting member or the second abutting member abuts on the recording material at a maximum height position at which the recording material can be supported by the second supporting unit in a direction orthogonal to the attachment/detachment direction and the width direction of the recording material.