Adjusting The Spreader - JUKI MF-7900 Series Engineer's Manual

(7) Adjusting the spreader

WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
1. Height of the spreader
It is the standard that the height from the top surface of throat plate ❷ to the bottom surface of
spreader ❶ is 7.8 to 8.2 mm.
2. Longitudinal position of the spreader
It is the standard that when spreader ❶ returns from the extreme left position to the right and top end
A of thread hooking section reaches to the front of left needle, the clearance between the spreader
and the left needle is 0.1 to 0.3 mm.
0.1 to 0.3 mm
3. Protruding amount
It is the standard that the dimension from the center of left needle to top end A of thread hooking
section, when spreader ❶ is in the extreme left position, is 4.5 to 5.5 mm.
4. Spreader stroke
It is the standard that the spreader stroke is 17 to 18 mm at the stroke of thread hooking section.
5. Timing of the spreader
Standard position is the position where the spreader ❶ is in the extreme left position when the needle
bar comes down from the upper dead point by 1.1 ± 0.1 mm.
Standard adjustment
7.8 to 8.2 mm
4.5 to 5.5 mm
– 16 –
Extreme left position
17.0 to 18.0 mm