Patent ID: 8851770

Claim:
An apparatus capable of duplex printing, the apparatus comprising: a sheet feeding unit configured to feed a continuous sheet; a conveying mechanism including a roller configured to be provided with driving force, configured to convey the sheet; a printing unit including a line print head, configured to perform printing on the sheet conveyed by the conveying mechanism; a reverse unit configured to reverse the sheet for the duplex printing, wherein, in the duplex printing, the printing unit performs printing a plurality of images on a first surface of the sheet fed from the sheet feeding unit, the printed sheet is reversed by the reverse unit to feed the reversed sheet to the printing unit again, and the printing unit performs printing a plurality of images on a second surface, which is a back of the first surface, of the sheet fed from the reverse unit; a first acquisition unit configured to acquire rotation information of the roller; a second acquisition unit configured to acquire information about a movement state of the sheet by measuring a surface of the conveyed sheet; and a control unit including a memory, wherein correction data is acquired and stored in the memory prior to beginning the duplex printing by associating information acquired by the first acquisition unit with information acquired by the second acquisition unit with respect to at least one rotation of the roller, wherein the correction data contains first correction data configured to be used in printing on the first surface while the roller contacts the second surface to convey the sheet, and second correction data that is different from the first correction data and is configured to be used in printing on the second surface while the roller contacts the first surface to convey the sheet, wherein the control unit reads the correction data corresponding to the rotation information acquired by the first acquisition unit from the memory during printing on each of the first surface and the second surface to correct at least one of driving control of the line print head and driving control of the roller.