Adjusting The Needle-To-Hook Timing And The Needle Guard - JUKI LZ-2290C-F Instruction Manual

7-3. Adjusting the needle-to-hook timing and the needle guard

WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
❶
0 to 0.05 mm
(1) Positioning the hook
1) Referring to "7-1. Hook timing adjustment mode",
adjust the hook timing to 214 °. Or, adjust the hook
timing by aligning the blade point of hook with the
center of needle at the height of "2" of accessory
timing gauge ❶ .
2) At this time, the blade point of the hook should
slightly come in contact with the needle when the
needle guard does not touch the needle.
(2) Confirmation
Bring the needle to the leftmost position of the zig-
zag stroke at the time of the standard zigzag width
of 8 mm, and confirm that the top end of the needle
eyelet is spaced 0.2 to 0.5 mm away from the blade
point of the hook. If the zigzag width of 10 mm is
used or the shape of indented part of the needle is
different from that of indented part of the needle at
the time of delivery, re-adjust the height of the nee-
dle bar.
(3) Adjusting the needle guard
1) Maximize the zigzag width. Bend the needle guard
to adjust so that the needle does not come in con-
tact with the blade point of the both at the leftmost
and rightmost positions of the zigzag stroke. At this
time, adjust the clearance provided between the
needle and the blade point of the hook to 0 to 0.05
mm.
2) The needle guard functions to keep the needle away
from the blade point of the hook, thereby preventing
damage to the blade point of the hook. Whenever
you have replaced the hook with a new one, be sure
to adjust the position of the needle guard.
When thread breakage has occurred, there
is a case where thread is caught in the
hook.
Be sure to perform sewing after removing
the thread caught in the hook.
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