48
5) Adjusting the Spring on the Upper Side of
the Shuttle
A. Adjusting the spring on the upper side of the shuttle.
After removing the lower feed plate and the needle
plate from the machine, unfasten the upper side
spring screw. Place the spring on the upper side of
the shuttle so that the center of the needle meets
point vertically, and is 1mm apart from point
horizontally. Then tighten the screw.
B. How to set the upper thread loop control plate in
place.
Unfasten the upper thread loop control plate screw
①, then place the upper thread loop control plate so
that the end of the upper thread loop control guide
is 2mm apart from the center of the needle.
Then, tighten the upper thread loop control plate
screw ①.
[ Caution ]
If the surface around the spring is rough or scratched,
the thread may be disconnected or the thread strand
may be unfastened. Always check the surface before
operating the machine.
6) Adjusting the Moving Knife and the Fixed Knife
A. Use the trimming lever control screw to adjust the space A between the thread removing point of the moving knife
and the needle plate hole as indicated in the table with the needle bar stopped at the upper position.
B. Use the fixed knife screw to adjust space B between the fixed knife and the needle plate cover as indicated in the
table.
C. Check the position of the knife by trimming manually after the adjustment.
[ Fig. 75 ]
G
H
4.5mm
5.3mm
1~1.2mm
1~1.2mm
AB
Needle Plate
Cover
Fixed Knife
→
→
↔
B
A
Moving Knife
[ Fig. 73 ]
[ Fig. 74 ]
1mm
①
①
Upper
Thread
Loop
Adjusting
Plate
Upper Thread
Loop Adjusting
Guide
①
→
→
2mm
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