Abstract: A sewing machine includes a sewing portion, a detector, a processor, and a memory. The sewing portion includes a needle bar and a transport portion. The needle bar is configured to have a sewing needle on a lower end. The transport portion is configured to move a work cloth. The detector is configured to detect ultrasonic waves. The memory stores computer-readable instructions that instruct the processor to perform specifying a position of a transmission source of the ultrasonic waves based on the ultrasonic waves that are detected by the detector, specifying sewing information based on the specified position of the transmission source, the sewing information being information that pertains to sewing, and controlling the sewing portion based on the specified sewing information.

Abstract: A sewing machine includes a control portion that controls a thread tension adjustment portion and a feed portion such that a first stitch and a second stitch are formed alternately on a sewing object. The first stitch includes only a stitch in which an interlacing point of the upper thread and a bobbin thread is lower than a top surface of the sewing object. The second stitch includes at least one set of a first section and a second section. The first section is a section in which the interlacing point and the bobbin thread are pulled out, by the thread tension, in the first direction on the top surface of the sewing object. The second section is a section in which the bobbin thread is pulled out in the second direction, and at least part of the second section overlapping with the first section.

Abstract: A sewing machine includes a control portion that controls a thread tension adjustment portion and a feed portion such that a first stitch and a second stitch are formed alternately on a sewing object. The first stitch includes only a stitch in which an interlacing point of the upper thread and a bobbin thread is lower than a top surface of the sewing object. The second stitch includes at least one set of a first section and a second section. The first section is a section in which the interlacing point and the bobbin thread are pulled out, by the thread tension, in the first direction on the top surface of the sewing object. The second section is a section in which the bobbin thread is pulled out in the second direction, and at least part of the second section overlapping with the first section.