27
17) Adjusting wiper
Manually turn pulley to make white arm carved sign align with white pulley carved sign. (The best position of thread take- up)
Loosen two wiper shaft clamp screws
of wiper base and push the link . When is done, adjust wiper shaft
to make 2mm
clearance between wiper and needle and then tighten the wiper shaft clamp screw . After that, loosen the wiper clamp screw
to
make clearance between the lower wiper and the needle end 2mm. Finally, fasten the wiper clamp screw
tightly. (See figure 48, 49)
[Figure 48]
[Figure 49]
18) Adjusting feed cam
A. To adjust the timing of feed dog and needle, move the feed cam
up and down. It is normal that when manual turn of pulley
drops feed dog and the upper feed dog adhere to the upper needle plate, attach the lower hole of needle to the upper feed dog.
a) To enhance the needle tightening, move feed dog slightly slower than needle. To that end loosen feed cam clamp screw ,
turn the feed cam
to the opposite direction and then fasten the clamp screw .
b) To prevent delay of cloth , move feed dog slightly faster than needle. To that end, loosen feed cam clamp screw , turn the
feed cam
to the direction and then fasten the clamp screw .
[Figure 50]
Needle
Needle plate
Feed dog (Normal)
Feed dog (Fast)
Feed dog (Slow)
