Control device, printing apparatus and non-transitory computer-readable recording medium

A non-transitory computer-readable recording medium storing computer-readable instructions for a control device that controls an image printing executed by a printing execution unit,

• the printing execution unit comprises:
• a printing head having a plurality of nozzles for ejecting ink;
• an ink supply unit configured to supply the ink to the printing head;
• a main scanning unit configured to execute a main scanning of moving the printing head relative to a print medium in a main scanning direction;
• and
• a sub-scanning unit configured to execute a sub-scanning of moving the print medium relative to the printing head in a sub-scanning direction intersecting with the main scanning direction,
• wherein the printing execution unit repeats partial printing of ejecting the ink from the printing head while the main scanning unit executes the main scanning, and the sub-scanning by the sub-scanning unit respectively, to print an image on the print medium, and
• wherein the sub-scanning unit comprises:
• an upstream roller conveying the print medium on a further upstream side than the printing head in the sub-scanning direction;
• and
• a downstream roller conveying the print medium on a further downstream side than the printing head in the sub-scanning direction, and
• the computer-readable instructions, when executed by the control device, causing the control device to perform:
• determination processing of determining whether a first condition indicating that a supply of the ink from the ink supply unit to the printing head is possibly delayed at the partial printing is satisfied or not, for each of a plurality of band images included in an image to be printed and aligned in the sub-scanning direction;
• first printing processing of, in a case where the first condition is not satisfied, causing the printing execution unit to print the band image by single time partial printing;
• and
• second printing processing of, in a case where the first condition is satisfied, causing the printing execution unit to print each of N partial images (N is an integer of 2 or greater) included in the band image and aligned in the sub-scanning direction by single time partial printing, to print the band image by N times partial printings,
• wherein in a case where the control device performs the second printing processing, the computer-readable instructions cause the printing execution unit to perform:
• in a first state that the print medium is supported by the upstream roller and is not supported by the downstream roller, print a first upstream partial image, which is located at an upstream end in the sub-scanning direction, included in the N partial images earlier than a first downstream partial image, which is located at a downstream end in the sub-scanning direction, included in the N partial images;
• and
• in a second state that the print medium is not supported by the upstream roller and is supported by the downstream roller, print a second downstream partial image, which is located at a downstream end in the sub-scanning direction, included in the N partial images earlier than a second upstream partial image, which is located at an upstream end in the sub-scanning direction, included in the N partial images.