To Adjust The Timing Of The Needle And The Lower Looper - Janome FOUR-DBL Service Manual

TO ADJUST THE TIMING OF THE NEEDLE
AND THE LOWER LOOPER
Correct Setting:
When the needle comes up 2.8 to 3.2 mm (7/64 to 1/8") from its lowest position, the tip of the lower
looper comes just left of the needle (#11) on the right.
To adjust:
1. Remove the presser foot, needle plate and left-side needle.
2. Replace right-side needle with a #11 one.
3. Turn the handwheel toward you to get the lowest needle position.
4. Set the two gauges (787-G02, 787-G03), as shown in (Fig. 1) and tighten bolt (B).
# This time, there should be no clearance between the gauges and the needle bar lower bushing.
5. Remove plate gauge (787 - G03). Then turn the handwheel toward you until it touches the needle
bar lower bushing, as shown in (Fig. 2).
6. In this condition, loosen the hexagonal bolt (C) just enough to move the lower looper base.
Adjust the lower looper position in order to meet the tip of lower looper with left-side of needle (#11), as
shown in (Fig. 3) and (Fig. 4).
Tighten hexagonal bolt (C).
7. Remove the gauge (787 - G02).
# Check the clearance between the needle and lower looper.
# Check the clearance between the loopers.
8. Replace the right side needle with a #14 one.
9. Attach the left side needle, needle plate and presser foot.
# Be careful not to tighten bolt (B) too much.
No clearance !!
787-G03
Plate gauge (787-G03)
(Thickness: 3 mm
Color: Black)
Lower looper
Lower looper base
Hexagonal bolt (C)
(Fig. 3)
Needle bar lower bushing
Bolt (B)
Needle gauge
(787-G02)
(Fig. 1)
Right needle (#11)
Lower looper
20
Raise the
needle bar
(Fig. 2)
Right needle (#11)
3 mm
(Fig. 4)