Adjustment Of The Hook And Needle Plate; Timing Adjustment Of Needle And Hook - SunStar KM-818 User Manual

2) Adjustment of the Hook and Needle Plate

※ When replacing the hook, check the position of the needle plate. The standard position is match
then needle plate at the side of needle ①or the needle has moved up by 0.15 to 0.2 mm.
Adjust the needle plate by bending it until it
reaches its good position.
(1) In case of bending the needle plate inward. insert
a screwdriver into outward of the needle plate and
then bend it.
(2) In case of bending the plate outward, insert a
screwdriver into inward of the needle plate and
then bend it.

3) Timing Adjustment of Needle and Hook

Preparation for the adjustment of needle and hook
◆
1. Turn the
counterclockwise until it will be stopped.
2. While the needle bar pocate lowest point by turning
the flying wheel, loosen the clamp screw ①.
Height of the needle bar
◆
Set the stitch length at its lowest value and turn
the machine pulley toward operator until the needle
bar reaches its lowest position. While the pulley is
rotated, the needle bar moves up by about 2.5mm. In
this position, the standard on distance between the
hook and the end of the needle eye must be 1.8 mm.
Position of the hook
◆
Set the stitch length at its lowest value and turn
the machine pulley toward operator until the needle
bar reaches its lowest position.
While the pulley is rotated the needle bar moves up
by about 2.5mm.
In this position, the hook point must position on the
center of the needle and the gap between the hook
point and the slot of the needle must be about 0.02 to
0.1 mm.
14
stitch length adjusting dial to
hook point
[lowest point
of the needle]
0.02~0.1mm
[Fig. 10]
needle center
1.8mm
2.5mm
hook point
needle bracket
[Fig. 11]