29
12) Lubrication Adjustment for Hook
When you replace the hook or change sewing speed, adjust lubrication amount of hook as the following order.
13) Adjustment of Upper Thread Remainder after Thread Cutting
Standard remainder of upper thread after thread cutting is as shown in the following table according to thread type.
[ Fig. 36 ]
■ Confirmation of lubrication amount
A. Perform no load operation over 1 minute at rotation
number of sewing machine that actually sews.
B. After inserting the lubrication check list① to the left of
hook, operate the sewing machine for about 10
seconds at the speed number of sewing machine that
actually sews. (Quality of lubrication check paper①
does not matter.)
C Confirm the oil quantity spread on the paper.
※ You must check the average lubrication amount
by repeating 3~4 times.
[ Fig. 37 ]
■ Lubrication Adjustment
A. Lay down the sewing machine.
B. Adjust lubrication amount by turning oil adjusting
screw③.
C. Confirm the lubrication amount by referring to
[Confirmation of lubrication amount] above.
※ Repeat adjustment of oil adjusting screw③ and
confirmation of lubrication amount until it becomes
proper amount.
D. After sewing for about 2 hour, confirm the lubrication
amount again.
<Over Lubricated>
<Properly Lubricated>
<Less Lubricated>
→
←
→
←
←→
25mm
50mm
5~15mm
②
①
①
③
Upper Thread
Filament #60
Span(dex) #60
Upper Thread Remainder
50~60mm
40~50mm
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