JUKI MF-7900 Series Engineer's Manual page 75

3. Spreader
(1) Height of the spreader
Spreader
Insert the timing gauge between the top surface of the throat plate
and the bottom surface of the spreader.
MF-7500 Series and MF-7900 Series are different in the height.
Use the gauge on which MF-7500 Series is stamped for "MF-7700"
Throat plate
or that on which MF-7900 Series is stamped for "MF-7800".
(2) Protruding amount of the spreader
To align
When the spreader travels to its front end (extreme left position),
fit the left needle to the slit of the gauge, and adjust the lateral
position so that the top end of the thread guide of the spreader is
aligned with the end of the gauge.
(3) Clearance between the needle and the spreader
Insert the gauge between the left needle and the spreader when
the spreader starts to return from the extreme left position to the
right and comes nearest to the left needle, and adjust the clear-
ance.
(4) Clearance between the spreader and the fixed thread guide
Insert the gauge between the spreader and the fixed thread guide,
and adjust the height of the fixed thread guide.
(5) Clearance between the fixed thread guide and the needle
clamp thread guide
Bring the needle bar to the lowest position of its stroke, insert two
pieces of the gauge between the fixed thread guide and the nee-
dle clamp thread guide, and adjust the height of the needle clamp
thread guide.
4. Height of the feed dog
Bring the feed dog to its highest position, put the gauge from the
upper part of the feed dog and adjust the height.
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