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15
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[Adjusting the counter knife]
1)
Properly installing the knife thread guide
Install the knife thread guide
❶
so that the needle enters exactly the center of its opening.
2) Properly installing the counter knife
1. The standard distance from the blade point of the counter knife
❷
to the knife thread guide
❶
, which is posi-
tioned so that the needle enters the center of its opening, is 0.5 mm.
2. The blade point of the counter knife
❷
is about 4 mm away from the center of the needle.
3. The sharpness of the counter knife
❷
depends upon the installing angle of the blade point of the counter
knife
❷
. The proper overlap of the counter knife
❷
blade with that of the moving knife
❸
will provide the best
sharpness.
4. Whenever the counter knife
❷
has been readjusted or replaced, be sure to check the sharpness of the count-
er knife
❷
, and adjust the installing angle of the counter knife
❷
.
Short
Center of
needle
❷
❸
❶
Long
Length of thread remaining on needle
0.5 mm
Center
❷
❸
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