Checking The Concentricity; Described In 3-1-10 And Have Found It Is Not Correct) - JUKI PS-900-13090 Instruction Manual

3-1-11. Checking the concentricity (How to handle the case where you have checked the
timing between the needle entry and the hook as described in 3-1-10 and have found
it is not correct)
1. Adjusting the concentricity between the hook driving shaft saddle and the needle bar
If the needle and the hole in the throat plate are not aligned, concentricity between them has to be ad-
justed. Correct the concentricity between the needle and the hole in the throat plate through the adjust-
ment of their positions in four directions (0°, 90°, 180° and 270°).
Eye protection
cover
❸ ❸
3) Reset the hook driving shaft saddle to the 0° position.
4) Attach the concentricity adjustment jigs to the throat plate and to the needle with the respective screws.
5) Adjust the T-shaped jig so that the needle bar jig passes through the hole in the T-shaped jig when low-
ering the needle bar.
Insert needle bar jig ❹ into the needle bar.
When you lower the needle bar, carefully check whether it interferes with other parts.
Presser foot
Resin cover
Needle
Throat
plate
Needle
– 18 –
1) Remove two resin covers, eye protection cover
and presser foot.
2) Remove the throat plate and the needle.
Hole in the
T-shaped jig
❸ ❸
❹ ❹