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Adjustment procedures
Results of Improper adjustment
1. Changing the needle bar stroke
(1) Loosen setscrew
❻
(remove the rubber plug) in eccentric pin
❺
.
(2) Draw out eccentric pin
❺
by more than 1 mm, turn eccentric
pin
❺
by 180°, position notch mark
F
of the eccentric pin away
from the center of main shaft, push the pin, and fix the pin with
setscrew
❻
.
(Caution) When it is hard to pull out eccentric pin
❺
, enter an
M4 screw in the M4 screw hole
G
and pull it out.
* Position of the notch mark of eccentric pin
At the time of needle bar stroke 31 mm :
notch mark is on the side of the center of main shaft.
At the time of needle bar stroke 33 mm :
notch mark is on the side away from the center of main shaft.
(Caution) There is a groove to fit, when eccentric pin
❺
is
turned by 180°, at the fitting section of eccentric pin
❺
and counter weight
❹
. After the change, check
that the pin has completely entered the groove. At
the same time, check whether eccentric pin
❺
has
completely entered up to the end.
When the pin is excessively pressed, abnormal noise
or worn-up will be caused.
◦ In case of the thick materials,
the stroke is changed. However,
basically, use the machine with
the standard stroke.
◦ When the needle bar stroke is
increased, needle heat or sew-
ing trouble mat occur.
◦ When the needle bar stroke is
increased, reduce the sewing
speed for use.
Good result is obtained from the
viewpoint of durability.
