JUKI MF-7800D Series, Руководство инженера

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1. Remove setscrews and remove needle cooler unit and cam
cover .
2. Adjust the height of rear needle guard with setscrew and
adjust the longitudinal position with setscrew .
(Caution) After the adjustment, check by manual turning whether
the top end of looper does not come in contact with
the needle.
3. When turning the rear needle guard cam in the direction of
rotation, the timing of rear needle guard is advanced, and when
turning it in the reverse direction, the timing is retarded.
o When the clearance provided be-
tween rear needle guard and
the needle is large, stitch skip-
ping, blunt blade point of the
looper, or needle breakage will be
caused.
o When the contact of rear needle
guard with the needle is
strong, blunt needle tip will be
caused.
Adjustment Procedure Results of Improper Adjustment