Sewing machine, method for determining embroidery frame and program

1. A sewing machine, comprising:

a photography unit for photographing an attached embroidery frame from a height direction;

a database in which a plurality of embroidery frame images are registered;

an embroidery frame transfer unit for moving the embroidery frame from a specific location until the photography unit detects the embroidery frame corresponding to one of the plurality of embroidery frame images registered in the database;

an embroidery frame size calculation unit for calculating a size of the embroidery frame based on a moving distance of the embroidery frame from the specific location until the photography unit detects the embroidery frame, the embroidery frame being moved by the embroidery frame transfer unit; and

an embroidery frame identification unit for identifying the embroidery frame based on the size of the embroidery frame calculated by the embroidery frame size calculation unit.

2. The sewing machine according to claim 1 , wherein

the embroidery frame images registered in the database are a partial image of the embroidery frame.

3. The sewing machine according to claim 1 , wherein

the embroidery frame transfer unit moves the embroidery frame so that the photography unit photographs the embroidery frame arranged at a quadrant on which the specific location is located when looked down from the photography unit.

4. The sewing machine according to claim 1 , wherein

the embroidery frame transfer unit is an X motor for moving the embroidery frame in an X direction or a Y motor for moving the embroidery frame in a Y direction.

5. The sewing machine according to claim 4 , wherein

the embroidery frame transfer unit is the X motor for moving the embroidery frame in the X direction and the Y motor for moving the embroidery frame in the Y direction.

6. The sewing machine according to claim 5 , wherein

the embroidery frame transfer unit moves the embroidery frame from the specific location until the photography unit photographs the embroidery frame located in the X direction or the Y direction, and then moves the embroidery frame until the photography unit photographs the embroidery frame located in the other of the X direction and the Y direction.

7. The sewing machine according to claim 1 , wherein

the embroidery frame size calculation unit calculates the size of the embroidery frame based on a first positional relation between the center of the embroidery frame and the specific location and a second positional relation before and after movement of the embroidery frame transfer unit.

8. The sewing machine according to claim 7 , wherein

the embroidery frame size calculation unit calculates the size of the embroidery frame based on a third positional relation between an identification range and the center of a photographing range of the photography unit by comparing the embroidery frame images registered in the database with the image of the embroidery frame photographed by the photography unit.

9. The sewing machine according to claim 1 , wherein

the size of the embroidery frame is a longitudinal length or a lateral length of the embroidery frame.

10. The sewing machine according to claim 1 , wherein

the embroidery frame has a rectangular shape, a circular shape or an elliptical shape.

11. A method for identifying an embroidery frame of a sewing machine,

the sewing machine comprising:

a photography unit;

an embroidery frame transfer unit;

an embroidery frame size calculation unit; and

an embroidery frame identification unit,

the method comprising the steps of:

the photography unit photographing an attached embroidery frame from a height direction;

the embroidery frame transfer unit moving the embroidery frame from a specific location until the photography unit detects the embroidery frame corresponding to one of the plurality of embroidery frame images registered in the database;

the embroidery frame size calculation unit calculating a size of the embroidery frame based on a moving distance of the embroidery frame from the specific location until the photography unit detects the embroidery frame, the embroidery frame being moved by the embroidery frame transfer unit; and

the embroidery frame identification unit identifying the embroidery frame based on the size of the embroidery frame calculated by the embroidery frame size calculation unit.

12. A non-transitory computer readable medium having a program stored thereon, the program making a sewing machine execute a method for identifying an embroidery frame;

the sewing machine comprising:

a photography unit;

an embroidery frame transfer unit;

an embroidery frame size calculation unit; and

an embroidery frame identification unit,

the method comprising the steps of:

controlling the photography unit to photograph an attached embroidery frame from a height direction;

controlling the embroidery frame transfer unit to move the embroidery frame from a specific location until the photography unit detects the embroidery frame corresponding to one of the plurality of embroidery frame images registered in the database;

calculating a size of the embroidery frame based on a moving distance of the embroidery frame from the specific location until the photography unit detects the embroidery frame, the embroidery frame being moved by the embroidery frame transfer unit; and

identifying the embroidery frame based on the size of the embroidery frame calculated by the embroidery frame size calculation unit.