Sewing machine and non-transitory computer readable storage medium storing program

1. A sewing machine, comprising:

a sewing device including a needle bar configured to have a sewing needle, and a transport device configured to move a work cloth;

a plurality of detection devices configured to detect ultrasonic waves;

a processor; and

a memory configured to store computer-readable instructions that instruct the sewing machine to execute steps comprising:

specifying, when an ultrasonic wave transmitted from a transmission source of the ultrasonic wave is detected by the detection devices, a position of the transmission source of the ultrasonic waves, based on the detected ultrasonic waves,

specifying a sewing position on the work cloth based on the specified position of the transmission source, the sewing position including a restart position where sewing is to be restarted,

moving the work cloth by the transport device in accordance with the specified sewing position so that the restart position is coincident with a needle drop point of the sewing needle, and

restarting the sewing by the sewing device from the restart position.

2. The sewing machine according to claim 1 , wherein specifying the position of the transmission source comprises specifying the position of the transmission source of the ultrasonic waves based on an elapsed time from when the detected ultrasonic waves are transmitted from the transmission source to when the detected ultrasonic waves are detected by the detection devices.

3. The sewing machine according to claim 1 , wherein

the sewing position includes a starting position where sewing is to be started,

specifying the sewing position comprises specifying the position of the transmission source as the starting position, and

the computer-readable instructions further instruct the sewing machine to execute steps comprising:

moving the work cloth by the transport device so that the specified starting position is coincident with the needle drop point of the sewing needle, and

starting the sewing by the sewing device from the starting position after the specified starting position is made coincident with the needle drop point.

4. The sewing machine according to claim 1 , wherein

the sewing position includes an ending position where sewing is to be ended,

specifying the sewing position comprises specifying the position of the transmission source as the ending position, and

the computer-readable instructions further instruct the sewing machine to execute steps comprising:

moving the work cloth by the transport device so that, while the sewing is performed, the specified ending position is coincident with the needle drop point of the sewing needle, and

ending the sewing by the sewing device at the ending position when the specified ending position is made coincident with the needle drop point.

5. The sewing machine according to claim 1 , wherein

the sewing position includes a pattern position where a pattern is to be sewn,

specifying the sewing position comprises specifying the position where the pattern is to be sewn based on the pattern position, and

the computer-readable instructions further instruct the sewing machine to execute steps comprising:

moving the work cloth in accordance with the specified position, and

sewing the pattern in the position where the pattern is to be sewn.

6. The sewing machine according to claim 1 , further comprising:

a thread detector configured to detect a break in a thread for the sewing,

moving the restart position to be coincident with the needle drop point when the thread detector detects the break in the thread, and

restarting the sewing from the restart position after the restart position is coincident with the needle drop point.

7. A non-transitory computer-readable medium storing computer-readable instructions that instruct a sewing machine that includes a sewing device including a needle bar configured to attach a sewing needle, and a transport device configured to move a work cloth, and a plurality of detection devices configured to detect ultrasonic waves to execute steps comprising:

specifying, when an ultrasonic wave transmitted from a transmission source of the ultrasonic wave is detected by the detection devices, a position of the transmission source of the ultrasonic waves, based on the detected ultrasonic waves,

specifying a sewing position on the work cloth based on the specified position of the transmission source, the sewing position includes a restart position where sewing is to be restarted,

moving the work cloth by the transport device in accordance with the specified sewing position so that the restart position is coincident with a needle drop point of the sewing needle, and

restarting the sewing by the sewing device from the restart position.

8. The non-transitory computer-readable medium according to claim 7 , wherein specifying the position of the transmission source comprises specifying the position of the transmission source of the ultrasonic waves based on an elapsed time from when the detected ultrasonic waves are transmitted from the transmission source to when the detected ultrasonic waves are detected by the detection devices.

9. The non-transitory computer-readable medium according to claim 7 , wherein

the sewing position includes a starting position where sewing is to be started,

specifying the sewing position comprises specifying the position of the transmission source as the starting position, and

the computer-readable instructions further instruct the sewing machine to execute steps comprising:

moving the work cloth by the transport device so that the specified starting position is coincident with the needle drop point of the sewing needle, and

starting the sewing by the sewing device from the starting position after the specified starting position is made coincident with the needle drop point.

10. The non-transitory computer-readable medium according to claim 7 , wherein

the sewing position includes an ending position where sewing is to be ended,

specifying the sewing position comprises specifying the position of the transmission source as the ending position, and

the computer-readable instructions further instruct the sewing machine to execute steps comprising:

moving the work cloth by the transport device so that, while the sewing is performed, the specified ending position is coincident with the needle drop point of the sewing needle, and

ending the sewing by the sewing device at the ending position when the specified ending position is made coincident with the needle drop point.

11. The non-transitory computer-readable medium according to claim 7 , wherein

the sewing position includes a pattern position where a pattern is to be sewn,

specifying the sewing position comprises specifying a position where the pattern is to be sewn based on the pattern position, and

the computer-readable instructions further instruct the sewing machine to execute steps comprising:

moving the work cloth by the transport device so that, while the sewing is performed, the specified ending position is coincident with the needle drop point of the sewing needle, and

sewing the pattern in the position where the pattern is to be sewn.

12. The non-transitory computer-readable medium according to claim 7 , further comprising:

moving the restart position to be coincident with the needle drop point when a broken thread detector detects the break in the thread, and

restarting the sewing from the restart position after the restart position is coincident with the needle drop point.