Lower Thread Winding Length - Toyota SD Service Manual

Adjustment of respective parts

9.Lower thread winding length

[Condition]
Thread: Cotton yarn # 60
Wind-up: When the wound thread contacts the
bobbin stopper and the bobbin stops
[Diagnosis]
1. Set the bobbin on the bobbin winder shaft.
2. When the bobbin has returned to the original
position (to left) after winding up the lower
thread, measure the states of winding (A, B).
(Fig. 1)
A: Winding deviation
B: Winding amount
[Standard]
A = 1.5 mm or less (One-sided winding)
B = 1.5 to 2.0 mm (Winding amount) (Fig. 1)
* Make adjustment if the diagnosis result fails to
meet the standard.
[Adjustment]
1. Adjustment of one-sided winding
(1)Loosen the thread guide plate set screw,
adjust the position of the thread guide
plate up and down.(Fig. 2)
Higher bracket position increases the wind-
ing amount of higher side of bobbin.
Lower bracket position increases the wind-
ing amount of lower side of bobbin.
(2)Tighten the thread guide plate set
screw.(Fig. 2)
* Repeat the adjustment till the standard is met.
2. Adjustment of winding amount
(1)Loosen the bobbin stopper set screw, turn
the bobbin stopper to adjust.(Fig. 2)
Right turn decreases the winding amount.
Left turn increases the winding amount.
(2)Tighten the bobbin stopper set screw.
(Fig. 2)
* Repeat the adjustment till the standard is met.
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