Sheet post-processing apparatus, image forming apparatus, and image forming system

An image forming apparatus comprising a sheet post-processing apparatus that includes:

• a sheet cutting device
• that performs a cutting process on a booklet formed by a bundle of center-folded sheets of paper and
• that includes:
• a conveying member that conveys the booklet;
• a leading edge stopper capable of reciprocating in a booklet conveying direction and used for setting a cutting position where the cutting process is to be performed by abutting on a center-folded portion of the booklet;
• and
• a supporting member that supports the booklet when the cutting position of the booklet is to be set, wherein
• when the booklet is being conveyed, the conveying member and the conveyed booklet are located in a contact position where the conveying member and the conveyed books are in contact with each other, and
• when the cutting position of the booklet is to be set, each of the conveying member and the conveyed booklet is located in one of separated positions that are separated from each other, and the cutting position of the booklet is set by the leading edge stopper while the conveyed booklet is supported by the supporting member.

An image forming system comprising a sheet post-processing apparatus that includes:

• a sheet cutting device
• that performs a cutting process on a booklet formed by a bundle of center-folded sheets of paper and
• that includes:
• a conveying member that conveys the booklet;
• a leading edge stopper capable of reciprocating in a booklet conveying direction and used for setting a cutting position where the cutting process is to be performed by abutting on a center-folded portion of the booklet;
• and
• a supporting member that supports the booklet when the cutting position of the booklet is to be set, wherein
• when the booklet is being conveyed, the conveying member and the conveyed booklet are located in a contact position where the conveying member and the conveyed books are in contact with each other, and
• when the cutting position of the booklet is to be set, each of the conveying member and the conveyed booklet is located in one of separated positions that are separated from each other, and the cutting position of the booklet is set by the leading edge stopper while the conveyed booklet is supported by the supporting member.