Sheet postprocessing apparatus including restriction device that restricts movement of lower guide of inlet guide, and image forming system

Abstract

A sheet postprocessing apparatus includes an inlet guide, a perforation device, and a collection tank. The inlet guide includes an upper guide and a lower guide. The perforation device is located downstream of the inlet guide in a sheet transport direction. The collection tank is located on a lower side of the perforation device. The lower guide is supported so as to pivot in an up-down direction, about an end portion in a sheet width direction. The collection tank is removably supported, by sliding in the sheet width direction. The lower guide includes a lever located on the other end portion in the sheet width direction, and configured to disengage the lower guide from the upper guide. The collection tank includes a restriction device opposed to the lever and configured to restrict pivotal movement of the lower guide, when the collection tank is attached to the perforation device.