Sewing machine and sewing machine control method

A sewing machine comprising:

• a pillar extending in an up-down direction;
• a bed extending from a lower end of the pillar in an extending direction orthogonal to the up-down direction;
• a needle bar;
• a presser bar;
• a projector configured to project a projection image onto a projection area on the bed;
• a feed dog provided on the bed and configured to move a workpiece on the bed;
• and
• a processor configured to execute:
• projecting a projection image onto the projection area, the projection image including a pattern image representing a buttonhole pattern, the buttonhole pattern being formed in a state in which a buttonhole presser is mounted to the presser bar;
• and
• sewing the buttonhole pattern on the workpiece by controlling the feed dog and the needle bar, wherein
• a forward feed direction is from the needle bar toward the presser bar,
• a longitudinal direction is orthogonal to the forward feed direction and the up-down direction,
• a lateral direction is along the forward feed direction and is orthogonal to the longitudinal direction,
• the pattern image includes:
• a first stitch stack and a second stitch stack each extending in the lateral direction and facing in the longitudinal direction;
• and
• a third stitch stack and a fourth stitch stack each extending in the longitudinal direction and facing in the lateral direction, and
• the greater a size of a button in the lateral direction is, the greater each length of the first stitch stack and the second stitch stack in the lateral direction is.

A sewing machine comprising:

• a pillar extending in an up-down direction;
• a bed extending from a lower end of the pillar in an extending direction orthogonal to the up-down direction;
• a needle bar;
• a presser bar;
• a projector configured to project a projection image onto a projection area on the bed;
• a feed dog provided on the bed and configured to move a workpiece on the bed;
• and
• a processor configured to execute:
• projecting a projection image onto the projection area, the projection image including a pattern image representing a buttonhole pattern, the buttonhole pattern being formed in a state in which a buttonhole presser is mounted to the presser bar;
• and
• sewing the buttonhole pattern on the workpiece by controlling the feed dog and the needle bar, wherein
• the sewing machine further comprises an image sensor for capturing an imaging area, the imaging area including a part of the projection area on the bed,
• the processor is further configured to execute detecting a size of a button placed to the buttonhole presser based on output of the image sensor,
• the projection image includes the pattern image based on the size of the button, and
• the processor is further configured to execute:
• determining whether the buttonhole presser is mounted to the presser bar, and the detecting includes detecting the size of the button in a case where it is determined that the buttonhole presser is mounted to the presser bar.