– 45 –
Arm’s engraved marker dot coincides with hand wheel’s engraved
marker dot (green).
1. Method of confirmation
(1) Let the sewing machine fall down.
(2) Turn the hand wheel by hand in regular direction until the thread
take-up lever reaches a bit toward the upper dead point. When the
camís driven part notch is pushed by the finger to the left (in
the direction of the arrow), the roller enters the thread trimming cam
groove and is meshed there.
(3) In this state, turn the hand wheel in forward and reverse directions.
Then, there will be a position where the hand wheel comes in contact.
(If the hand wheel is turned more, that position is where the camís
driven part begins to move.)
At that time, the armís engraved marker dot coincides with the
hand wheelís engraved marker dot (in green).
2. Method of adjustment
(1) Let the sewing machine fall down.
(2) Loosen the second screw and the first screw of the thread trimming
cam setscrew in this order.
(3) Adjust the engraved marking dot of the hand wheel.
(4) Pressing the cam’s driven part notch to the left, make the thread
trimming cam meshed with the roller and turn only the thread
trimming cam by the finger tip in the reverse direction of the
vertical feed shaft rotation without turning the vertical feed shaft. In
the position where the thread trimming cam comes in contact,
push the thread trimming cam to the roller and tighten the thread
trimming cam setscrews in the order of the first screw and the
second screw.
Adjustment Procedure Results of Improper Adjustment
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