35
oil whetstone
fixed blade
B. In case that the thread is cut or the cut part of the thread
is not neat, please confirm the cutting part of the fixed
blade. If the bottom of the fixed blade is worn, sharpen
the end of the blade using an oil whetstone.(Refer to
Figure 8-26)
8.17) Adjusting remaining amount of upper
thread
After thread trimming, adjust the spare upper thread
amount of the needle with the auxiliary thread tension
adjusting nut
①
.
The remaining thread becomes shorter when you turn it
right, and the thread becomes longer if you turn left.
(Refer to Figure 8-28)
8.16) Adjusting thread release
A. Adjust such that the dish of upper thread tension
controller opens about 1mm when the thread trimming
solenoid is in the operation.
B. Adjustment is available by loosening the thread release
cable fixing nut and wire. (Refer to Figure 8-27)
[Fig. 8-26]
[Fig. 8-27]
[Fig. 8-28]
If the gap of the control dish is too narrow,
it invites the shortening of the upper thread
causing a possible thread missing in the
next work. If the gap is too wide, a bad
thread tightening caused because the dish
will be always open.
Caution
①
solenoid link fixing screw
open amount 0.5~1mm
0.5mm
thread trimming
following crank
solenoid arm
thread release
cable fixing nut
solenoid base
solenoid link pin
solenoid base
fixing screw
Summary of Contents for KM-1640BL-7
Page 2: ......
