Printing machine and delivery of printing machine

A printing machine that includes a paper ejector in which sheets conveyed by a delivery conveyor are discharged through an opened portion and the discharged sheets are accommodated, the printing machine comprising:

• an area sensor that includes a plurality of sensors arranged between the delivery conveyor and a top surface of the accommodated sheets and that forms a sensing area to sense access of a human body to a side of the delivery conveyor near an end of the opened portion that extends in a direction intersecting with a longitudinal direction of a sheet that is passed through the opened portion, and
• a sensor controlling unit that performs on/off control, based on preset information about a size of sheet received by the printing machine, to the sensors arranged near the end of the opened portion through which largest size of sheets are passed but sheets that are reduced in width in a longitudinal direction compared with the largest size of sheets are not passed in the sensing area, when discharged.