Adjusting Thread Release; Adjusting Remaining Amount Of Upper Thread - SunStar KM-640BL-7 User Manual

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.

20) Adjusting thread release

Adjust such that the dish of upper thread tension
controller opens about 1mm when the thread trimming
solenoid is in the operation.
Adjustment is available by loosening the thread release
cable fixing nut and wire. (Refer to Figure 50)
(Caution)
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.
21) Adjusting remaining amount of upper
thread
Adjust the remaining amount of upper thread is adjustable
with the auxiliary thread tension adjusting nut.
The remaining thread becomes shorter when you turn it
right, and the thread becomes longer if you turn left.
(Refer to Figure 51)
oil whetstone
solenoid link pin
solenoid link fixing screw
solenoid arm
0.5mm
thread release
thread trimming
cable fixing nut
following crank
open amount 0.5~1mm
fixed blade
[Figure 49]
solenoid base
solenoid base
fixing screw
[Figure 50]
[Figure 51]
27