–17–
(1) Adjusting the needle thread tension
1) TurnthreadtensionnutNo.1
❶
clockwise
A to
shortenthelengthofthreadremainingonthe
topofneedleafterthreadtrimming.Turnthenut
counterclockwise
B
tolengthenit.
2) TurnthreadtensionnutNo.2
❷
clockwise
A to
increasetheneedlethreadtension,orcounter-
clockwise
B
todecreaseit.
Apply the same tension to both of the
thread tension nut No. 2.
In the case, the length of thread remaining
at the needle tip cannot be increased, re-
place the spring of tension controller No. 1
with 22945505 which is separately available.
16. THREAD TENSION
(2)
Adjusting the bobbin thread tension
Turntensionadjustmentscrew
❸
clockwise
A to
increasethebobbinthreadtension,orcounterclock-
wise
B
todecreaseit.
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
❶
❷
B A
A
B
❸
B
A