– 42 –
1) Remove rubber cap
❶
.
2) Loosen nut
❷
and turn oil amount adjustment
screw
❸
to adjust the amount of oil in the hook.
Turning the screw clockwise
A
will decrease the
amount of oil in the hook or counterclockwise
B
will increase it.
3) The appropriate amount of oil, when a sheet of
paper is placed near the periphery of the hook,
is to such an extent that splashes of oil from the
hook appear in approximately ve seconds as
shown in the gure on the left.
In the case the oil quantity in the hook
cannot be adjusted to the proper quantity, it
should be adjusted by loosening nut
❹
and
turning oil quantity adjusting screw
❺
.
The
oil quantity in the hook is increased by turn-
ing the oil quantity adjusting screw coun-
terclockwise C, or is decreased by turning it
clockwise D.
Also check to be sure that the oil is fed to the
hook at the sewing speed of 1,000 sti/min.
4-12. Adjusting the oil quantity in the hook
WARNING :
To check the amount of oil supplied to the hook, take care not to allow your nger and the oil-amount
checking sheet to come in contact with the moving parts such as the hook and feed mechanism.
Contacting those parts can cause injury.
❸
❷
B
A
❶
❹
❺
C
D
A sheet of
paper
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