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Adjustment procedures
Results of Improper adjustment
(5) Initial position of the lower thread trimmer mechanism
1. When the lower knife
❹
is located at its leftmost position, the
top end of the lower knife
❹
has to be spaced 24 ± 0.5 mm
from the center of needle bar. Perform the adjustment by loos-
ening the nut
.
(6) Adjusting the stopper
1. Adjust the position of stopper
so that a clearance of 0.3 to 1
mm is provided between looper
and clamp pressure adjust-
ing spring
when the counter knife is located at its leftmost
position (forward end).
(7) Adjusting the height of the lower knife
1. When the needle is positioned at its upper dead point, the
clearance of 0 to 0.1 mm has to be provided between the under
surface of lower knife
❹
and the top surface of looper
.
(Caution) Perform the work with the needle bar at the highest
position when actuating the thread trimmer mecha-
nism by hand.
(8) Adjusting the lower knife holder guide
1. When the lower knife
❹
moves from right to left, the lower knife
guide holder
should lightly comes in contact with the guide
.
