−30 −
Adjustment Procedures Results of Improper Adjustment
◯ Position of the counter knife
1. Loosen counter knife setscrews ① .
2. Make the end face of the counter knife come in contact with
the difference in step of the counter knife base.
3. Adjust so that the distance between the end face of counter
knife base ② and the top end of counter knife is 13 ± 0.1 mm.
4. Tighten the setscrews.
◯ Position of the clamp spring
1. Loosen clamp spring setscrews ④ .
2. Make the end face of clamp spring ⑤ come in contact with
the difference in step of the counter knife base.
3. Slide the spring while making it come in contact with, and
adjust the position using section A or B of the counter knife
gauge.
4. Section A is 1.7 mm in thickness and section B 1.5 mm.
Adjust the position of clamp spring so that when this section
is inserted between the counter knife and the clamp spring,
you feel that section A is slightly caught between them and
you do not feel that section B is caught.
At this time, the clearance between the counter knife and the
clamp spring is approximately 1.6 mm.
5. Tighten the setscrews.
(Caution) • When the position of the counter knife and/or
the clamp spring is moved, re-adjust the
position of the counter knife base and the knife
pressure.
1. Loosen setscrews ① in the counter knife base.
2. Move the counter knife base to the position as shown in Fig.
42 using the counter knife gauge supplied as accessory.
Make the end face of the counter knife base come in contact
with the difference in step of the hook shaft saddle in the
longitudial direction.
Make the section “C” of the counter knife gauge come in
contact with the end face of the throat plate in the lateral
direction.
3. Move the counter knife base and adjust so that the top end of
the counter knife comes in contact with the section “D” of the
counter knife gauge, and securely tighten the setscrews.
At this time, the distance from the end face of the throat plate
to the top end of the counter knife is 4.8 mm.
(Caution) • When the counter knife base is moved, re-
adjust the knife pressure.
● When dimension A is large :
• Length of bobbin thread clamp is
shortened. As a result, stitch
skipping will occur.
● When dimension A is small :
• Defective thread trimming will
result.
● When dimension B is large :
• Defective bobbin thread clamp will
occur.
• Stitch skipping at the start of
sewing will occur.
● When dimension B is small :
• Needle thread is clamped and
cloth is hard to be taken out.
Simultaneous removing of bobbin
thread clamp will result.
• Excessive clamp pressure is
applied and deformation of the
clamp spring will occur.
● When dimension A is large :
•Knife pressure is increased
resulting in motor-stop.
● When dimension A is small :
• Knife pressure is decreased and
defective thread trimming will
occur.
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