Mitsubishi DB-189 User Manual

c
How to use the machine
6. Adjustment of
thread tension:
>
O
Well balanced
stitch
in case upper thread is
y/ too strong or lower thread ^
is too weak
In case upper thread is
too weak or lower thread
is too strong
7. Upper thread tension:
** Upper thread is adjusted according to
the lower thread tension.
*» Upper thread tension is adjusted by
tension regulating thumb nut.
For special fabric sewing with special
thread, the desired tension can be ob
tained by adjusting the strength and op
erating range of thread take-up spring.
Standard adjust
ment of thread
take-up spring
Tension
strength
Operating
range
Light
weight
lOg
6 — 7mm
Medium
weight
15-30g
6 — 8mm
8. Lower thread tension:
Thread tension
spring--. Strengthen
Weaken
Lower thread tension
can be adjusted by
screw A.
9. Adjustment of hook oil
lubrication:
Adjustment is made by means of oil lubri
cation ring (A). Regular amount; 1.5—2.0
(0 less - 3 more)
In case of cotton thread
ff60, the regular thread ten
sion can be checked as the
following. Hold the end of
pulled out thread, and if
the bobbin case fall slowly,
the proper tension is ob
tained.
Thread
tension
nut
Strengthen
Weaken
Rotation
of bobbin
From the library of: Superior Sewing Machine & Supply LLC

Mitsubishi DB-189 Specifications