Patent ID: 7159860

Claim:
A sheet post-process apparatus, comprising: a plurality of rollers configured to receive and convey sheets conveyed from an MFP main body; a waiting tray which is provided at some midpoint of a conveying path, and is configured to cause a sheet conveyed from the rollers to be in a waiting state when a post-process is required, the waiting tray including a pair of waiting tray parts arranged at a predetermined interval in a transverse direction orthogonal to a sheet conveying direction; an adjustment mechanism for adjusting the predetermined interval between the pair of waiting tray parts in accordance with a width of the sheet, the predetermined interval being set to a first width smaller than a width of the sheet orthogonal to the sheet conveying direction for loading the sheet being in the waiting state and to a second width larger than the width of the sheet; a processing tray configured to receive the sheet conveyed from the waiting tray and a sheet conveyed from the rollers without staying at the waiting tray having the pair of waiting tray parts set to the second width before performing the post-process; a strike-down mechanism provided above the waiting tray and configured to strike the sheet loaded in the waiting tray down on the processing tray, the strike-down mechanism comprising: a strike-down member for giving a downward force at a center portion of the sheet to make the sheet bent and fall down to the processing tray by a self weight of the sheet; a solenoid; and a plunger which is sucked and ejected in accordance with magnetic excitation and non-excitation of the solenoid, wherein the strike-down member is supported at one end of the plunger while freely rotated; an alignment mechanism configured to align sheets on the processing tray to form a bundle of sheets; a post-process mechanism configured to perform the post-process of the bundle of sheets aligned on the processing tray; a sheet conveying unit configured to convey the bundle of sheets to which the post-process has been performed from the processing tray; and a storage tray configured to load the conveyed bundle of sheets thereon.