38
39
40
60°
9
13
5.7 Adjusting the trimming pressure of the movable
knife and fixed knife (Fig.38)
a. Loosen the set screw A.
b. Turn the adjusting screw B to adjust the trimming
tension between the movable knife and the fixed knife.
After adjustment, tighten the screw A.
Note: If there is too much trimming tension between the
movable knife and the fixed knife, it will cause strong
movement and trimming failure. Therefore, the minimum
trimming tension is required.
Move the movable knife to make sure that if it can cut the
thread sharply.
When it can not cut the thread sharply, polish the fixed
knife as shown in the Fig.39 and replace the movable
knife for a new one.
5.8 Adjusting the needle gauge (Fig.40)
a. Uninstall the needle plate, feed dog and the needle
clamp.
b. Tilt back the machine head.
c. Loosen the two screws J.
d. Take down the spring M.
e. Loosen the rotating hook screws A, B. And adjust the
clearance between the rotating hook and the needle.
f. Install the spring M.
g. When the crank C, D is close to position screw E, F,
tighten the screw J.
h. Turn the balance wheel to lower the needle bar to its
lowest position.
i. Loosen the screw cap G, H.
j. Press down the trimming driven crank K, adjust the
trimming link L, so that the trimming roller is able to
get into the trimming cam groove.
k. Adjusting the trimming cam and the trimming roller.
1) Press down the trimming driven crank K so that the
trimming roller is able to get into the trimming cam
groove.
2) Turn the trimming link L, adjust the clearance
between the trimming roller and trimming cam groove
N to its minimum, then tighten the screw G, H.
3) Press down the trimming driven crank K again, and
check that if the trimming roller is able to get into the
trimming cam groove smoothly.
Fixed knife bracket
Screw A
Adjusting screw B
Fixed knife
Hone
Lower shaft
N side
Screw A
Position screw E
Link
Rotating hook saddle (right)
Spring M
Trimming roller
Trimming roller
Trimming cam groove
Trimming cam
Screw A
Crank C
Crank D
Screw B
Screw J
Screw B
Link L
Trimming crank K
Trimming cam
Trimming roller
Screw cap G
Rotating hook
saddle (left)
Position pin F
Screw cap H
