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8-8. Adjusting height of the needle bar
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.
1
8-9. 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.
Cau tion
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.
128
A
2
1
A
0 to 0.05 mm
1) Set the zigzag width to "0". Bring the needle to the
center of the zigzag stroke.
2) Remove the presser foot, throat plate, semicircle
plate and feed dog.
3) Place a semicircle plate on the plane, to which the
throat plate is to be attached, of the bed. Loosen
setscrew 2, and adjust so that from the top surface
of semicircle plate A to the bottom end of the needle
bar is as high as "1" of timing gauge 1.
1. Thickness of the semicircle plate is
different from that of the throat plate. Be
sure to use the semicircle plate when
adjusting the height of the needle bar.
Be sure to perform the adjustment with
zigzag width set to zero and with the
Cau tion
needle positioned at the center of the
zigzag stroke.
2. Use the timing gauge on which the
indication "E" is engraved which has
been supplied as accessories. (Part No.
22536502)
(1) Positioning the hook
1) After the completion of the adjustment of the needle bar
height, adjust so that the blade point of the hook comes
to the center of the needle at the height of the "2" of
timing gauge 1 which has been supplied as accessories.
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
Maximize the zigzag width (LZ-2290A : 5 mm). Bring
the needle to the leftmost position of the zigzag stroke.
Now, 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 needle 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 contact 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.
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