Computerized Control System for Square Buttonhole Machine Preparation before Sewing
11
1
）
Remove the knife screw
②
to disassemble the
knife
①
and shim.
2
）
Press the knife and adjust the distance from
the knife to the needle plate to 1~2mm as
shown in the picture at above. Then install the
shim and fix the screw.
If the size of the knife is printed in British size, please refer to the table at below:
Size of Knife (displayed in British size and relating metric size)
Size of Knife
（
British size
）
Size of Knife
（
metric size
）
mm
1/4 6.40
3/8 9.50
7/16 11.10
1/2 12.70
9/16 14.30
5/8 15.90
11/16 17.50
3/4 19.10
13/16 20.60
7/8 22.20
1 25.40
1 1/8
28.60
1 1/4
31.80
1 3/8
34.90
1 1/2
38.10
