Print control method and print apparatus

An apparatus capable of performing duplex printing, the apparatus comprising:

• a sheet feeding unit configured to feed a sheet, wherein the sheet is continuous;
• a print unit having an inkjet head configured to perform printing on the sheet fed from the sheet feeding unit;
• a reverse unit configured to reverse the printed sheet and feed the reversed sheet to the print unit again;
• a decurl unit configured to perform decurling of the sheet fed from the reverse unit;
• a reader arranged to read a reference mark recorded on the sheet;
• a cutter unit configured to cut the sheet;
• a detecting unit configured to detect a cut mark on the sheet;
• and
• a control unit, wherein the control unit controls in a manner that:
• the print unit prints a plurality of images on a first surface of the sheet,
• the print unit records the reference mark in an area between one image and a next image sequentially printed on the first surface,
• the reverse unit reverses the sheet where the plurality of images are printed on the first surface,
• the decurl unit performs decurling of the sheet fed from the reverse unit,
• the reader reads the reference mark recorded on the first surface of the reversed sheet fed from the reverse unit through the decurl unit, wherein a position to be printed of an image on a second surface, which is a back of the first surface of the sheet, is set based on the reading of the reference mark,
• the print unit prints a plurality of images on the second surface of the sheet fed from the reverse unit,
• the print unit records a cut mark in a margin area between one image and a next image sequentially printed on the second surface based on the reading of the reference mark,
• the detecting unit detects the cut mark on the second surface within a limited search range, which is narrower than the margin area and is set inside the margin area, in order to set a first cut position and a second cut position for cutting off the margin area based on the detection of the cut mark,
• the control unit sets a first cut position and a second cut position for cutting off the margin area in response to the detection of the cut mark within the limited search range, or the control unit sets the first cut position and the second cut position by estimating a position of the cut mark based on information on already detected cut mark in response to no detection of the cut mark within the limited search range, and
• the cutter unit cuts the sheet at the first cut position and the second cut position, and each of cut sheets on which the images are formed both on the first and second surfaces is discharged.