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Adjustment of respective parts
3.Clearance between needle and upper plate spring
[Condition]
<SD>
Pattern selection dial: "11"
<2D>
Pattern selection dial: "7"
<3D>
Pattern selection dial: "3"
Stitch width lever: "5"
[Diagnosis]
1. When the needle bar is brought to the lower
dead point at the right side by rotating the
handweel, measure the clearance (A, B)
between the needle and the upper plate
spring.(Fig. 2)
[Standard]
A = 0.5 to 1.2 mm
B = 0.5 to 1.0 mm (Fig. 2)
* Make adjustment if the diagnosis result fails to
meet the standard.
[Adjustment]
1. Remove the extension table, and open the
shuttle cover.
2. Remove the shuttle hook cover.
3. Loosen the shuttle hook cover adjustment
screw, adjust the position of upper plate
spring.(Fig. 3)
* Repeat the adjustment till the standard is met.
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