Mechanical adjustment
Backlash between Hook Gear and Lower Shaft Gear
The rotary play of the hook point should be 0.8 mm or less when it is in between the span of
the feed dog teeth. And, the gears should turn smoothly.
Adjustment procedure:
1. Remove the needle plate (A) and bobbin holder (B).
2. Remove the front cover (See page 8.).
3. Loosen the setscrew (E).
4. If the rotary play is too large: Turn the lower shaft bushing in the direction of (C).
If the rotary play is too small: Turn the lower shaft bushing in the direction of (D).
5. Tighten the setscrew (E).
6. Attach the front cover.
7. Attach the bobbin holder and needle plate.
Note: After adjustment of the backlash, check the needle timing to hook and feed dog height,
and adjust them if necessary.
Needle plate setscrew
Nedle plate (A)
Hook
Bobbin holder (B)
Setscrew (E)
Notch
Lower shaft bushing
Lower shaft gear
(C)
(D)
Direction of notch on
lower shaft bushing
Hook shaft gear
Hook point
Check the play
The span of feed dogs
18
To Next Page
Loading...
