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11. ADJUSTMENT
103
KE-430F, BE-438F
11. ADJUSTMENT
CAUTION
Maintenance and inspection of the sewing machine
should only be carried out by a qualified technician.
Ask your Brother dealer or a qualified electrician to
carry out any maintenance and inspection of the
electrical system.
Turn off the power switch and disconnect the power
cord from the wall outlet at the following times,
otherwise the machine may operate if the foot
switch is depressed by mistake, which may result in
injury.
・When carrying out inspection, adjustment and
maintenance
・When replacing consumable parts such as the
rotary hook
Hold the machine head with both hands when tilting
it back or returning it to its original position.
Furthermore, after tilting back the machine head, do
not push the face plate side or the pulley side from
above, as this may cause the machine head to
topple over, which may result in personal injury or
damage to the machine.
If the power switch needs to be left on when carrying
out some adjustment, be extremely careful to
observe all safety precautions.
If any safety devices have been removed, be
absolutely sure to re-install them to their original
positions and check that they operate correctly
before using the machine.
11-1. Standard thread tension
KE-430F
Use
Medium-weight
materials (-03)
Knitted wear
(-0K)
Foundation
garments (-0F)
Heavy-weight
materials (-05)
BE-438F
Upper thread
#50 or
equivalent
#60 or
equivalent
#60 or
equivalent
#30 or equivalent #60 or equivalent
Lower thread
#50 or
equivalent
#80 or
equivalent
#60 or
equivalent
#50 or equivalent #60 or equivalent
Upper thread tension (N)
[Tension value]
0.8 - 1.2
[80 - 120]*
1
1.2 – 1.8
[70 - 130]*
1
0.5 - 1.2
[50 - 150]*
1
Lower thread tension (N) 0.2 - 0.3 0.2 - 0.3
Pre-tension (N) 0.05 - 0.3 0.1 - 0.4
Needle DP x 5 #14 DP x 5 #9 DP x 5KN #11 DP x 17NY #19 DP x 17NY #12
*1: This is the tension value when the pretension is 0.05 N.