Brother ArtCity140, Service Manual, Page: 127 / 151

4 - 9
Adjust
ment
Adjustment
Adjustment Needle swing timing
[Standard]
At pattern selecting dial [4] (zigzag stitch/stitch width: maximum), when the needle bar
starts oscillating movement from left to right, the distance from the needle plate top
surface to the needle point should be more than 6.5 mm.
* When the needle bar stops oscillating movement from left to right, the distance
from the needle plate top surface to the needle point should be more than 6.5
mm.
[Confirmation]
1. When the pulley is turned by hand from the rear to the front, check that the needle flow from left to right is
normal. And check that the upper shaft rotation is not too heavy.
*Key point
• If you find any error in needle swing timing, reattach the upper shaft to engage markings on the worm gear
and the pattern cam.
* Refer to
“2-30” .
Starting position
of lateral motion Stopping position
of lateral motion
More than 6.5 mm
Z finger
More than 6.5 mm
Needle plate
Contact
Contact
Pattern
cam
Pattern cam
Z finger
* The needle does not move to left/right direction under the needle plate.
[ OK ]
Needle plate
* The needle moves to left/right direction under the needle plate.
Worm gear
Pattern cam
Upper shaft
[ NG ]