Standard Adjustment; Height Of The Needle Bar; Positioning The Looper - JUKI MB-1373 Engineer's Manual

2. Standard Adjustment

(1) Height of the needle bar

Upper engraved lines
* The two upper engraved lines on needle bar
using a TQx1 needle, or the two lower ones should be used when using a TQx7 needle.

(2) Positioning the looper

1. Looper timing
The lower engraved lines on the needle bar should be aligned
with the bottom of lower bushing
highest position).
2. Clearance between the needle and looper
0.01 to 0.1 mm
3. Clearance between the needle guide and needle
0.05 to 0.1 mm
1. Looper timing
Engraved line
Looper's blade point
coincides with the
center of the needle.
Standard Adjustment
on needle bar should be aligned with the bottom of lower bushing
A
TQX1
TQX7
Standard Adjustment
(when the needle bar is at its
A
should be used for adjustment when
– 2 –
B
2. Clearance between needle
and looper
0.01 to 0.1mm
Looper's blade point
3. Clearance between the needle
guide and needle
0.05 to 0.1mm
.