JUKI MF-7900 Series Engineer's Manual page 49

Adjustment procedures
3. Adjusting the lateral position of the feed dog
(1) Loosen setscrew ❷ in rocking bar presser, right ❶ , and loosen
setscrews ❹ in rocking bar presser, left ❸ .
(Caution) When adjusting, perform the lateral adjustment with
the throat plate installed.
(2) When loosening setscrews ❷ and ❹ in the rocking bar press-
ers, right and left, the adjustment of main feed rocking bar ❻
and differential feed rocking bar ❺ in the lateral direction can
be performed. Adjust rocking bars ❺ and ❻ so that clearances
A provided between the throat plate and the feed dog are paral-
lel and equal.
(3) After clearances A provided between the throat plate and the
feed dog are adjusted to be parallel and equal, fix the rocking
bar pressers with setscrew ❷ in rocking bar presser, right ❶
and setscrews ❹ in rocking bar presser, left ❸ .
(Caution) After fixing rocking bar pressers, right ❶ and left ❸ ,
check that main feed rocking bar ❻ and differential
feed rocking bar ❺ smoothly move in the longitudi-
nal direction.
When they do not move well, loosen again setscrews
❷ and ❹ in the rocking bar pressers, right ❶ and left
❸ , and perform the adjustment.
Results of Improper adjustment
◦ When the lateral position of the
rocking bars ❺ and ❻ is incor-
rect, worn out of throat plate and
feed dog will be caused.
◦ When the rocking bars ❺ and ❻
do not move well in the longitudi-
nal direction, heating or abnor-
mal noise will be caused.
◦ The feed components will wear
out early, or the looseness will
be caused.
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