Patent ID: 7628388

Claim:
A postprocessing apparatus comprising: a housing to which at least one recording sheet is fed from a predetermined upstream device; a first postprocessing mechanism mounted in the housing and adapted for performing a predetermined first postprocessing to the recording sheet; a second postprocessing mechanism selectively mountable in or not mounted in the housing, and provided with a predetermined driver, the second postprocessing mechanism being adapted for performing a predetermined second postprocessing to the recording sheet; a conveyance passage provided in the first postprocessing mechanism and configured to connect the first postprocessing mechanism to the second postprocessing mechanism so that the recording sheet is conveyed to the second postprocessing mechanism when the second postprocessing mechanism is mounted in the housing; a conveying member provided in the conveyance passage and adapted for conveying the recording sheet; and a driving force transmission mechanism for selectively connecting the predetermined driver to the conveying member; wherein the conveying member is connected to the predetermined driver of the second postprocessing mechanism through the driving force transmission mechanism when the second postprocessing mechanism is mounted in the housing.