Image recording device and determination method

A determination method for an image recording device comprising a sheet feeding unit that feeds a sheet member along a sheet feeding path in a sheet feeding direction, and an image recording unit that records an image on the sheet member and defines a recordable area which is an area for forming the image on the sheet member,

• the determination method comprising:
• controlling the sheet feeding unit to feed the sheet member to an entry position before the image recording unit starts to record the image on the sheet member;
• determining whether the sheet member located at the entry position has a skew before the image recording unit starts to record the image on the sheet member;
• and
• controlling the image recording unit to record the image on the sheet member based on a determination result of the determining step;
• wherein the sheet member has a first position and a second position which are separated from each other in the sheet feeding direction;
• wherein the determining step comprises:
• controlling a detection unit to detect a first one side edge position of the first position of the sheet member and a second one side edge position of the second position of the sheet member in a widthwise direction perpendicular to the sheet feeding direction;
• and
• calculating a displacement amount based on the first one side edge position and the second one side edge position;
• wherein the image recording unit comprises:
• a carriage that reciprocates in the widthwise direction and supports the detection unit;
• and
• a recording head that is supported by the carriage and ejects ink droplets to the recording sheet for forming the image, the detection unit positioned upstream from the recording head in the sheet feeding direction,
• wherein the sheet member is determined to have the skew if the displacement amount is equal to or greater than a predetermined threshold value,
• wherein the sheet feeding unit is controlled to temporarily stop the sheet member before a leading edge of the sheet member reaches the recordable area, to restart feeding the leading edge to enter into the recordable area, and to temporarily stop the sheet member after the leading edge passes the recordable area;
• and
• wherein the detection unit is reciprocated by the carriage to detect the first one side edge position of the first position when the first feeding control unit firstly temporarily stops the sheet member, and moves with the carriage to detect the second one side edge position of the second position when the first feeding control unit secondly temporarily stops the sheet member.