25
(2) If the trimming was done manually, stop the machine
when the edge of the fixed knife meets the bobbin
catcher adjustment baseline that is marked on the top.
Loosen the bobbin catcher fixing screw
⑤
and adjust the
bobbin catcher so that the contact surface of the bobbin
catcher
④
lightly touches the center of the protruding
part of the bobbin
①
. Once the operation is completed,
check to see whether the bobbin catcher springs back
lightly.
20) Wiper Adjustment
(1) KM-250-7/KM-350-7 Series
Turn the pulley manually and stop when the white carved signs on the arm and the pulley are aligned. (highest point of
the thread take up lever) Loosen the two wiper shaft fixing screws
①
on the wiper base and press the connecting link
②
with the hand. Then adjust the wiper shaft
③
so that the gap between the wiper and the needle is about 2mm and tighten
the wiper shaft fixing screw
①
. Next, loosen the wiper fixing screw
④
and adjust so that the gap between the lower end
of the wiper and the end of the needle is about 2mm, after which the wiper fixing screw
④
must be tightly fastened. (See
Fig. 45 & 46)
Set the stitch length adjusting dial to
“
2.
”
Turn the pulley manually and stop when the white carved
signs on the arm and pulley are in a straight line. (highest
point of the thread take up lever) At this point, position the
wiper so that the needle and the presser foot are about 2mm
apart and then fix the position. (See Fig. 47)
[Fig. 44]
[Fig. 45]
[Fig. 46]
[Fig. 47]
(2) KM-506-7/KM530-7 Series
Bobbin Catcher
Adjustment Baseline
Movable Knife
Fixed blade
Keystone Sewing Machine Company, Inc.
