7
Needle up position : Rotate the machine pulley to reach mechanical needle up position and turn the photo
plate (A) until its red mark is aligned with the red mark on the bearing cover plate.
Needle down position : Rotate the machine pulley to reach mechanical needle down position and turn
the photo plate (B) until its blue mark is aligned with the red mark on the bearing
cover plate.
Note: instruction above is the standard adjustment. If you feel the position wasn’t accurate, please do
the fine tuning by yourself.
(7). Adjust the Speed Control Unit
Components of the speed control unit: see figure
A： Spring for toeing forward force adjustment
B： Bolt for heeling backward force adjustment
C： Treadle / Pedal arm。
D： Pitman Rod for Treadle / Pedal
B
A
C
D
decrease
increase
increase
decrease
1
2
3
Term of adjustment
Toeing forward
force adjustment
Heeling backward
force adjustment
Treadle stroke
adjustment
Adjustment result
Spring A move to right = force increased
Spring A move to left = force decreased
Bolt B turn = force decreased
Bolt B turn = force increased
Rod D secure at right = stroke is longer，
Rod D secure at left = stroke is shorter。
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