JUKI MF-7800D Series, Engineer'S Manual

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(10) Locus and longitudinal motion of the looper
1. It is the standard that the top end of left needle touches
the position of 1/4 to 1/3 from the bottom face of the back
of the looper when the looper returns from the extreme
left position in the standard looper motion locus.
2. Longitudinal motion timing of the looper
(1) The standard position of the cam is the position where
the engraved marker line on looper longitudinal motion
eccentric cam is adjusted to the center of notches
on looper driving shaft.
(2) It is the standard motion locus of the looper that the top
end of looper lightly comes in contact with right needle
and middle needle, and passes left needle with a
clearance of 0.05 to 0.1 mm when the rear needle guard
does not work.
0.05 to 0.1mm
1/4/ to 1/3
A
B
C
D
Standard Adjustment