29
3) Adjustment of Presser Foot Adjusting Arm
A. Turn the handle of the presser foot height adjusting shaft in the A direction to make the presser foot driving link touch the B part
of the arm.
B. Move and fix the presser foot height adjusting arm hinge screw
①
to the right.
C. Turn the pulley to move the needle bar to the lowest position. Pull up the presser bar. Make the moving link of the presser bar
touch the B part of the arm and set the presser bar bushing and the presser bar holder to be separated by 2mm. Fasten the fixing
screw
②
for the presser foot height adjusting arm.
D. Fasten the fixing screw
②
and check whether the presser foot height adjusting arm is fixed by shaking it back or forth.
E. Lastly adjust the presser foot height adjusting shaft.
※
Results of adjustment
－
When there is no distance (space), the presser bar bushing and the presser bar holder interrupt each other causing clearance.
－
If distance(space) is too large or too small, the presser bar's lowest position will change due to the adjustment of the presser
foot height adjusting shaft.
4) Adjusting thread release and dish opening width
A. Unfasten the thread release air cylinder bracket clamp screw
①
.
B. Operate a trimming to open and widen the thread guide dish.
C. Adjust the opening of the thread guide dish to be 0.6 ~ 0.8mm wide for general materials, and 0.8 ~ 1mm for heavy materials.
D. The closer the thread release air cylinder is to the needle bar, the wider the opening of thread guide dish becomes; and the closer
the thread release air cylinder is to the upper shaft motor, the narrower the opening becomes.
E. After adjusting the opening of the dish, fasten the clamp screw with the cylinder operating smoothly.
The opening
becomes wide
①
The opening
becomes narrow
Presser bar
bushing
Presser bar
[ Fig. 29 ]
[ Fig. 30 ]
②
①
B
A
2mm
presser foot driving link
Presser foot height
adjusting shaft
Presser bar holder
