Sewing machine and sewing machine control method

A sewing machine comprising:

• a movement mechanism configured to move a sewing object in a first direction and a second direction orthogonal to the first direction;
• a swinging mechanism including a needle bar having a lower end on which a sewing needle is mountable, and configured to swing the needle bar in a third direction orthogonal to the first direction and the second direction;
• a presser device including an insertion hole through which the sewing needle is insertable;
• a guide portion configured to guide a cord to the insertion hole from one side in the first direction;
• a processor configured to control the movement mechanism and the swinging mechanism;
• and
• a memory configured to store computer-readable instructions that, when executed by the processor, instruct the processor to perform processes comprising:
• acquiring pattern data that is used for sewing a couching pattern in which the cord inserted through the insertion hole is stitched to the sewing object, and that represents positions of a plurality of needle drop points, the couching pattern being a pattern in which a plurality of motifs are continuously arranged, each motif of the plurality of motifs being configured in a predetermined shape by a plurality of stitches including a main stitch and a sub-stitch, the main stitch having a longest length from among the plurality of stitches of the respective motif, the sub-stitch having a length shorter than that of the main stitch and extending in a direction intersecting the main stitch, and the pattern data being represented using a coordinate system of the movement mechanism in the first direction and the second direction;
• correcting at least one selected from the group of a start point position and an end point position of the main stitch of one of the plurality of motifs included in the pattern data, such that the length of the main stitch of the one motif, among the plurality of motifs represented by the acquired pattern data, is longer in a second case than in a first case, the first case being a case in which the end point position is a position obtained by moving the sewing object from the start point position toward another side in the first direction with respect to the needle bar, and the second case being a case in which the end point position is a position obtained by moving the sewing object from the start point position toward the one side in the first direction with respect to the needle bar;
• and
• driving the movement mechanism and the swinging mechanism in accordance with the corrected pattern data to sew the couching pattern.