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III. MAINTENANCE OF SAWING MACHINE
1. MAINTENANCE
1-1. Adjusting the height of the needle bar (Changing the length of the needle)
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.
❷
* Turn ON the power once, and turn OFF the power again after making the intermediate presser
in the lowered state.
1) Bring needle bar ❶ down to the lowest position of its stroke. Loosen needle bar connection screw
❷ and adjust so that the upper marker line ❸ engraved on the needle bar aligns with the bottom
end of the needle bar bushing lower ❹ .
2) As illustrated in the above figure, change the adjusting position in accordance with the needle
count. (The standard needle count is DP x 17 (B point), #24.)
*
If sewing problems such as stitch skipping and thread breakage when the needle bar is set at the
standard position, the problems may be fixed by finely adjusting the needle bar height within the
range of one marker line.
After the adjustment, turn the pulley to check for an extra load.
1-2. Adjusting the needle-to-shuttle relation
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.
❹
❺ : Marker line for DP
❺
❻ : Marker line for DP
❻
❷
❹
❶
❻
❶
x 17 needle (with
needle count higher
than #22)
x 17 needle (with
❸ : When DP x 17 needle (of
needle count lower
than #22)
❸
❺ : Market line for DP x 17
(with needle count higher than #22)
❻ : Marker line for DP x 17
(with needle count lower than #22)
❺
❶
*
Turn ON the power once, and turn OFF the
power again after making the intermediate
presser in the lowered state.
1) Turn hook driving shaft pulley ❶ by hand
and adjust lower engraved marker line ❸ to
the bottom end of needle bar lower metal ❹
when needle bar ❷ goes up.
❹
❸
w h i c h n e e d l e c o u n t i s
lower than #22) is used.
– 12 –
❹
❸
❸ : When DP x 17 needle (of
w h i c h n e e d l e c o u n t i s
higher than #22) is used.
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