Sewing machine

1. A sewing machine comprising:

a bed portion;

a conveyance portion including a feed dog, the conveyance portion being configured to convey a sewing object placed on the bed portion in a conveyance direction, using the feed dog;

a sewing portion including a needle bar, the sewing portion being configured to form stitches in the sewing object conveyed by the conveyance portion, by causing a sewing needle mounted on the needle bar to move up and down;

an image capture portion configured to perform image capture of an image capture range including below the needle bar;

a projector configured to project a projection image toward the bed portion;

a processor configured to control the conveyance portion, the sewing portion, the image capture portion, and the projector; and

a memory configured to store marker information and computer-readable instructions that, when executed by the processor, instruct the processor to perform processes comprising:

causing the image capture portion to perform the image capture at a predetermined timing, during a conveyance period in which the conveyance portion is being driven;

identifying the marker in a captured image obtained by the image capture, using the marker information stored in the memory;

identifying a projection position corresponding to the identified marker, when the marker is identified; and

causing the projector to project the projection image indicating the identified projection position, while following a movement of the marker on the sewing object being conveyed.

2. The sewing machine according to claim 1 , wherein

the causing the image capture portion to perform the image capture includes causing the image capture portion to perform the image capture a plurality of times during the conveyance period,

the identifying the projection position includes identifying the projection position on the basis of the captured image each time the image capture is performed, and

the causing the projector to project the projection image includes causing the projector to project the projection image while following the movement of the marker on the sewing object, by causing the projector to project the projection image indicating the identified projection position.

3. The sewing machine according to claim 1 , wherein

the identifying the projection position includes identifying, as the projection position, a position closer, by a predetermined amount, to the needle bar than a marker position, the marker position being a position, on the sewing object, of the marker identified on the basis of the captured image.

4. The sewing machine according to claim 3 , wherein

the computer-readable instructions further instruct the processor to perform a process comprising:

acquiring a sewing speed, and

the identifying the projection position includes setting the predetermined amount to be larger the faster the acquired sewing speed, compared to when the sewing speed is slower, and identifying the projection position closer to the needle bar, by the set predetermined amount, than the marker position.

5. The sewing machine according to claim 1 , wherein

the causing the image capture portion to perform the image capture includes causing the image capture portion to perform the image capture while the sewing object is not being conveyed, during the conveyance period.

6. The sewing machine according to claim 1 , wherein

the computer-readable instructions further instruct the processor to perform processes comprising:

calculating a distance in the conveyance direction from a marker position to below the needle bar, the marker position being a position, on the sewing object, of the marker identified on the basis of the captured image, and

stopping sewing by the conveyance portion and the sewing portion in a situation where the sewing object is conveyed by the calculated distance from the marker position.

7. The sewing machine according to claim 6 , wherein

the computer-readable instructions further instruct the processor to perform a process comprising:

stopping the sewing by the conveyance portion and the sewing portion in a situation where the calculated distance is a first distance.

8. The sewing machine according to claim 7 , wherein

the computer-readable instructions further instruct the processor to perform a process comprising:

causing a conveyance speed of the sewing object conveyed by the conveyance portion to be slower than a current speed, in a situation where the calculated distance is a second distance, the second distance being longer than the first distance.

9. The sewing machine according to claim 1 , wherein

at the projection position the projected image is a line segment extending in a direction orthogonal to the conveyance direction.

10. The sewing machine according to claim 9 , wherein

the causing the projector to project the projection image includes causing the projector to project the line segment, as the projection image, onto a virtual line extending to an upstream side in the conveyance direction from a position below the needle bar on the sewing object.

11. The sewing machine according to claim 1 , wherein

the causing the projector to project the projection image includes causing the projector to project the projection image onto the sewing object apart from onto the marker.

12. The sewing machine according to claim 1 , wherein

the computer-readable instructions further instruct the processor to perform a process comprising:

setting part of the captured image as a detection range, and

the identifying the marker includes identifying the marker in the detection range, using the marker information stored in the memory.

13. The sewing machine according to claim 12 , wherein

the setting the detection range includes

setting a first range, which is part of the captured image, as the detection range at a start of sewing, and

when the marker is identified from the detection range of a single one of the captured images, setting, as the detection range of the captured image by a subsequent image capture, a range that is smaller than the first range and that includes the projection position identified from the single captured image.

14. The sewing machine according to claim 12 , wherein

the setting the detection range includes

setting a first range, which is part of the captured image, as the detection range at a start of sewing, and

when the marker is not identified from the first range, setting, as the detection range, a second range, the second range being smaller than the first range, the second range being on an upstream side, in the conveyance direction, in the captured image.

15. The sewing machine according to claim 12 , wherein

the setting the detection range includes, after the marker is identified on the basis of the detection range in a single one of the captured images, when the marker is not identified from the detection range in the captured image by a subsequent image capture, setting the detection range that includes a marker position and a range further to an upstream side, in the conveyance direction, than the detection range identified on the basis of the subsequent image capture, the marker position being a position on the sewing object of the marker identified on the basis of the single captured image.