JUKI AMS-221F-2516 Instruction Manual page 86

[Adjustment of height of driver]
Adjust so that the blade point of inner hook ❹ meets the center of needle ❺ and tighten setscrew ❶ .
1)
Bend the needle guard section of driver ❻ in the direction of arrow A so that the protruding amount
2)
from the bottom end of the needle guard section of driver ❻ to the tip of needle ❺ is 0 to 0.5 mm
when the blade point of inner hook ❹ is out by 0.5 mm from the right end of needle ❺ .
Bend rear end B of driver ❻ in the direction B so that the clearance between rear end B of driver
3)
❻ and inner hook ❹ is 0.3 to 0.6 mm.
4) Carry out adjustment following the steps 3) to 6) on the previous page.
1. When making the needle size thicker, confirm the clearance between the needle tip or
the intermediate presser and the wiper. Wiper cannot be used unless the clearance is
secured. In this case, turn OFF the wiper switch, or change the set value of memory
switch U105.
2. When the height of the needle guard of the driver is not proper, abrasion of the blade
point of inner hook or stitch skipping will be caused.
[Adjusting the shuttle race upper spring]
❶
A
❹
bobbin thread retaining plate ❸ and shuttle race upper spring ❷ , with setscrew ❹ , so that the
thread can be smoothly passed when the thread is drawn in the direction of arrow C. Then, secure
the shuttle race upper spring with setscrews ❷ (two pieces).
The lateral position of shuttle race upper spring ❷ is likely to change when adjusting the
hook timing. It is, therefore, necessary to adjust the position of shuttle race upper spring
❷ after the completion of adjustment as described in
shuttle relation" p.81,
B
❷
❶
❹
❸
❺
C
82.
Detach throat plate ❶ . Adjust the position of
1)
the shuttle race upper spring with setscrews
❷ (two pieces).
For the adjustment of the lateral position of
the shuttle race upper spring, align the center
❺ of needle with the center of groove width B.
For the adjustment of the longitudinal position
of the shuttle race upper spring, align the rear
end of needle with corner A portion.
2) Adjust the overlapping amount D between
"III-1-2. Adjusting the needle-to-
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