Adjusting The Spreader - JUKI MF-7800D Series Engineer's Manual

(6) Adjusting the spreader

1. Height of the spreader
It is the standard that the height from the top surface of throat plate
is 7.8 to 8.2 mm.
2. Longitudinal position of the spreader
It is the standard that when spreader
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 0.3mm
3. Protruding amount
It is the standard that the dimension from the center of left needle to top end
when spreader
4. Spreader stroke
It is the standard that the spreader stroke is 17.0 to 18.0 mm at the stroke of thread hooking section.
5. Timing of the spreader
Standard position is the position where the spreader
comes down from the upper dead point by 1.1 ± 0.1 mm.
Standard Adjustment
returns from the extreme left position to the right and top end
A
is in the extreme left position, is 4.5 to 5.5 mm.
7.8 to 8.2mm
Extreme
left position
4.5 to 5.5mm
is in the extreme left position when the needle bar
– 16 –
to the bottom surface of spreader
A
17.0 to 18.0mm
of thread hooking section,
A
of
A