JUKI MF-7800D Series, Engineer'S Manual

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(6) Adjusting the spreader
1. Height of the spreader
It is the standard that the height from the top surface of throat plate to the bottom surface of spreader
is 7.8 to 8.2 mm.
7.8 to 8.2mm
0.1 to 0.3mm
A
Standard Adjustment
2. Longitudinal position of the spreader
It is the standard that when spreader 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.
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 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 17.0 to 18.0 mm at the stroke of thread hooking section.
5. Timing of the spreader
Standard position is the position where the spreader is in the extreme left position when the needle bar
comes down from the upper dead point by 1.1 ± 0.1 mm.
A
4.5 to 5.5mm
17.0 to 18.0mm
Extreme
left position