Image recording device including thermal head and reader positioned downstream of thermal head in conveying direction

An image recording device comprising:

• a housing;
• a thermal head located in the housing;
• a first supply member from which an ink ribbon is to be supplied toward the thermal head, the first supply member being located in the housing, the ink ribbon including an ink layer;
• a first take-up member located in the housing and configured to take up the ink ribbon;
• a conveying member located in the housing and configured to convey a medium toward the thermal head;
• a platen located in the housing and facing the thermal head, the platen and the thermal head being configured to sandwich both the ink ribbon and the medium at a nip position in a first direction in which the ink ribbon is conveyed;
• a first reader located in the housing and configured to optically read a first target portion of the ink ribbon which is positioned at a first reading position downstream of the nip position in the first direction so that a quality or condition of an image recorded on the medium can be determined;
• a second reader configured to optically read a second target portion of the medium which is positioned at a second reading position upstream of the nip position in a second direction in which the medium is conveyed;
• and
• a computer configured to perform:
• determining a positional relation between a first image formed on the medium and a second image prerecorded on the medium by using first reading data and second reading data, the first image being formed by ink transferred from the ink layer to the medium, the first reading data being based on a result of reading the first target portion of the ink ribbon by the first reader, the second reading data being based on a result of reading the second target portion of the medium by the second reader.