Patent ID: 7172194

Claim:
A sheet post-process apparatus, the apparatus comprising: a waiting tray which temporarily retains a transported sheet and releases the sheet; a processing tray which bundles the sheets dropped from the waiting tray to carry out predetermined processing and ejects the bundled sheets; and a storage tray which holds the bundle of sheets processed and ejected on the processing tray, wherein the processing tray comprises: a transport belt which transports the bundle of sheets; and a push feed arm mounted to be projected onto a surface on a sheet transport side of the transport belt, the push feed arm retaining a sheet distal end of the bundle of sheets so that the sheet distal end can be pushed and fed; wherein the transport belt forms a through hole through which the push feed arm penetrates, and the push feed arm comprises: a push feed face which pushes and feeds the sheet distal end; a penetrating projection portion which reaches a transport belt lower face from the push feed face through the through hole; and a hook shaped engagingly lock portion, formed integrally with the penetrating projection portion, engagingly locked on the transport belt lower face and being bent in the transport belt traveling direction, and wherein a face of the hook shaped engagingly lock portion on a side which comes into contact with the belt lower face is inclined in a downward direction at an angle of 10 degrees to 30 degrees while a longitudinal direction of the transport belt is defined as a reference.