Medium processing apparatus, image forming apparatus, and image forming system

A medium processing apparatus comprising:

• a binder to bind multiple sheets at a binding position to form a sheet bundle;
• a sheet inserter having an opening into which the sheet bundle is insertable from an outside of the sheet inserter to a bindable region having the binding position;
• a binding position verifier allowing the multiple sheets, inserted from the opening to the bindable region, to be verifiable from an outside of the sheet inserter;
• a sheet detector to detect the multiple sheets inserted in the sheet inserter;
• and
• circuitry configured to issue a notification that a part of the multiple sheets has reached the binding position.

A medium processing apparatus comprising:

• a binder to bind multiple sheets at a binding position to form a sheet bundle;
• a sheet inserter having an opening into which the sheet bundle is insertable from an outside of the sheet inserter to a bindable region having the binding position;
• and
• a binding position verifier allowing the multiple sheets, inserted from the opening to the bindable region, to be verifiable from an outside of the sheet inserter;
• wherein the binding position verifier includes an indicator at an end of the opening, and
• the indicator allows the binding position of the multiple sheets bound by the binder to be visually verifiable from the outside of the sheet inserter.