2. Adjusting rotating hook point timing with
needle.
The motive relation between rotating rotating
and needle affects the sewing quality. Standard tim-
ing relation is : turn the balance wheel to locate
needle bar to its lowest position , and lift back
2.5 mm the rotating hook point(D) should be coin-
cides with needle center line ( C ),and hook point
( D ) is 1.2mm above the upper edge(E)of needle eye.
When adjusting the rotating hook point tim-
ing also to note the clearance between notch bot-
tom of needle (D) and hook point ( C ) of approx
0.05mm must be maintained. (Fig 26)
.
.
.
Lift the needle bar to its highest position, remove
the throat plate, take down the needle and the bobbin
case. loosen rotating hook bobbin case holder position
bracket screw( C ) and take down position bracket( A ),
then loosen set screw.( D )of rotating hook to keep hook
freely, turning around its axis, turn the balance wheel
first to raise the feed bar to its highest position, at this
time, take down the rotating hook slowly while
turning it to keep away from the feed dog support.
Installing the rotating hook can be done in re-
verse sequence.
The projecting flange of the position bracket ( A )
should be engaged in the notch( B ) of the bobbin case
holder, and maintain a clearance of 0.5~0.7mm
between projecting flange top and the bottom of
notch while installing.
.
.
22.Removing and installing the rotataing hook(Fig 27)
28
-11-
27
25
26
23.Installing feed dog (Fig28
、
29)
A
C
D
B
0.5-0.7mm
A
B
C
D
0.05
m m
When feed amount is at the max. The front end
of feed dog (A) is near the front of throat plate slot,
the gauge between the two is 1.5mm. This is the
standard position of feed dog.
A
1.5mm
C
D
E
2.5
1.2
m m
m m
