Janome MC9900 - Tension Release Mechanism

22
0.2 to 0.8 mm
View A
Mechanical adjustment
Tension release mechanism
When the presser foot is lowered, the thread tension discs will be closed and pull the thread.
When the thread tension will be released, the tension disc will be opened and release the thread correctly.
Thread tension
gear
Convex part of
tension gear
Thread tension release
adjusting plate
Convex is NOT set at tension release
claw
Setscrew
Tension
release
claw
Thread
tension dial
Tension
release
claw
Setscrew
Fig. 1
Fig. 2
Thread tension release
adjusting plate
Fig. 3
0.2 to 0.8 mm
Thread tension release
adjusting plate
Tension discs (closed)
Tension discs supporter
Tension discs
supporter
Flat part of
tension gear
1 Remove the belt cover, top cover, front cover and base
cover (see page 1, 2, 3 and 6).
2. Attach the presser foot A. Lower the presser foot.
3. Turn the power switch off. Turn the thread tension gear
until the convex part of tension gear is NOT engaged
with the tension release claw (see figure 1).
4. Loosen the setscrew (see fig. 1 and 2).
5. Adjust the clearance between the tension release
adjusting plate and the tension disc supporter to
0.8 mm – 0.2 mm.
Tighten the setscrew (see fig. 2 and 3).
6. Turn the thread tension gear until the convex part of
tension gear is engaged with the tension release claw.
Be sure that the tension release adjusting plate
touches to the tension discs supporter and the tension
discs are opened slightly (see fig. 4 and 5).
Convex is engaged with tension release claw
Convex part of tension gear
Fig. 4
Thread tension gear
Tension
release
claw
Thread tension release
adjusting plate
Tension discs supporter
Tension discs (opened)
Fig. 5