Post-processing apparatus

An image forming apparatus, comprising:

• an image forming component;
• a conveyance component configured to convey a print medium;
• a discharge port that discharges the print medium conveyed by the conveyance component;
• a tray on which the print medium discharged from the discharge port is stacked and which is raisable and lowerable in a vertical direction;
• an elevation component configured to raise and lower the tray in the vertical direction;
• a detector configured to detect a top surface of an uppermost print medium of one or more sheets of print media stacked on the tray;
• and
• a controller configured to control the conveyance component and the elevation component and hold a relative position of the top surface with respect to the discharge port if the print medium is discharged from the discharge port at a first position, wherein
• the controller is configured to cause the conveyance component to convey the print medium at a first speed if a discharge time from a first timing indicating the timing relating to discharge of the print medium from the discharge port to a second timing indicating the timing when the print medium is detected by the detector is a first time and cause the conveyance component to convey the print medium at a second speed different from the first speed if the discharge time is a second time.

A method of post-processing a print medium supplied from an image forming apparatus, comprising:

• discharging the print medium conveyed by a conveyance component from a discharge port onto a tray on which the print medium is stacked and which is raisable and lowerable in a vertical direction by an elevation component configured to raise and lower the tray in the vertical direction;
• detecting a top surface of an uppermost print medium of one or more sheets of print media stacked on the tray;
• and
• controlling the conveyance component and the elevation component and holding a relative position of the top surface with respect to the discharge port if the print medium is discharged from the discharge port at a first position;
• causing the conveyance component to convey the print medium at a first speed if a discharge time from a first timing indicating the timing relating to discharge of the print medium from the discharge port to a second timing indicating the timing when the print medium is detected is a first time;
• and
• causing the conveyance component to convey the print medium at a second speed different from the first speed if the discharge time is a second time.