17
C. Auxiliary thread adjusting device
Turn the auxiliary thread tension-adjusting nut ①
clockwise to shorten the thread remaining in the
needle after trimming. Turn it counterclockwise to
lengthen the remaining thread. The appropriate
length of upper thread that remains in the needle after
trimming, is 30~40mm. See Figure 20.
[ Figure 20 ]
Short
Long
D. Adjusting the operating amount of thread release
The thread release function starts simultaneously with the
movement of trimming cam. As shown in Figure 21, move
the thread release wire ② connected to the operating lever
①, left and right to adjust the operating amount of thread
release. Loosen two fixing nuts ③, bring the cable wire ②
to the left, and fix the nuts ③ to increase the operating
amount of thread release. Bring the cable wire to the right
and tighten the nuts ③ to decrease the amount. After
adjustments, firmly tighten back the nuts ③ and operate the
thread release. Check if the thread guide dish ④ of the
thread adjusting device opens 0.5~1mm. Make sure that
the thread guide dishes ④ coincide with each other after
operation. The stroke of thread release lever ① is 5mm.
Adjust so that when the cable wire ② is pulled 0~2mm, the
thread guide dish ④ does not open, and opens only when
the cable wire is pulled 2~5mm. (Refer to Figure 21).
[ Figure 21 ]
More
Less
Opening amount:
0.5~1mm
[ Figure 22 ]
Weak
Strong.
Needle plate surface
5.5㎜
9)
Adjusting presser foot height and pressure
A. As described in Figure 22, take out the rubber cap ②
of the faceplate ①. Place the presser foot ③ on the
needle plate. Loosen the screw ④ of presser bar
handle to adjust the height of the presser bar handle.
When the presser bar handle is lifted up, the height of
the presser foot ③ will go down, and when brought
down, the height will go up. Run the presser foot
lifter ⑤ manually to lift the lower side of the presser
foot 5.5mm off of the upper side of the needle plate.
B. As shown in Figure 22, turn the pressure-adjusting
screw ⑥ clockwise to increase the pressure of the
presser foot, and turn it counterclockwise to decrease
the pressure. After adjustments, make sure to tighten
the fixing nut ①.
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