Sealed letter forming apparatus

A sealed letter forming apparatus comprising:

• a sheet feed unit containing an envelope sheet to be an envelope and a content sheet to be a content;
• a printer printing on the envelope and content sheets supplied from the sheet feed unit, respectively;
• an enclosing and sealing unit folding the envelope and content sheets printed by the printer, and enclosing and sealing the content sheet in the envelope sheet;
• and
• a controller controlling the enclosing and sealing unit,
• wherein a combination of the envelope sheet and the content sheet is defined as an article, and sealed letter forming processing is performed with respect to each article,
• when an error related to the envelope sheet or the content sheet in a first n-th article (n is a positive integer) occurs, the controller controls the enclosing and sealing unit to stop the sealed letter forming processing and to discharge the first n-th article including a first n-th envelope sheet and a first n-th content sheet, and thereafter, when the error is canceled, the controller controls the enclosing and sealing unit to perform the sealed letter forming processing without sealing a second n-th article following the first n-th article as a sealed letter to be checked manually.