4-4 Needle throw
How to check the needle throw
1. Turn the stitch pattern dial, and select the zigzag width (maximum zigzag width).
2. Turn the hand wheel, and check the locus of the tip of the needle.
3. After the needle has gone up from the lowest point and reached the upper face of the
throat plate, the tip of the needle should throw to the right or left.
(Right-side or left-side needle throw from the lower face of the throat plate should be
within 0.3 mm.)
Adjustment
-9-
-9-
-9-
-9-
-9-
Zigzag needle throw
Within
0.3 mm
Main shaft
Setscrew No.1
Setscrew
No.2
Worm gear
Tapered
Close
Coarse
Remove the front cover. (Including the face plate, throat plate, under side cover and rear cover.)
1. Turn the stitch pattern dial, and select the zigzag width (maximum zigzag width).
2. Loosen the setscrew No.2 of the worm gear. [2 mm hexagon screwdriver]
3. Raise the needle from the lowest point so that the tip of the needle comes to the
upper face of the throat plate. At this time, if the needle throws, loosen the setscrew
No.1 holding the handwheel by hand so that the handwheel does not turn.
4. In the direction of the home position where the tip of the needle does not throw,
slightly turn the worm gear only.
Then temporarily tighten the setscrew No.1.
Repeat this work until the right position is obtained.
Moreover, the worm gear is tapered. The more the worm gear is moved to the right,
the closer the engagement of the worm gear becomes.
5. Check again the needle throw condition, and if it is all right, securely tighten the No.1
and No.2 setscrews of the worm gear.
