27
7) VERTICAL ADJUSTMENT OF PRESSER FOOT
Set the needle bar to the lowest point.
Loosen the pressure adjustment fixation nut
and adjust it by rotating the pressure adjustment nut .
(When rotating the pressure adjustment nut counterclockwise, the presser foot is lifting.)
Adjust the distance between the presser foot base
and the presser foot spring plate A
to 0.3~0.5mm.
(It is better for the presser foot to float a little bit to make adjustment of sewing material overlapping width easily, reduce the noise
and vibration, improve the durability of the presser foot spring plate, prevent the feed dog damage.
Fix it by tightening the pressure adjustment fixation nut
firmly.
8) MAIN FEED ADJUSTMENT
The stitch length can be regulated from 1.6mm to 2.5mm basically and it is able to be regulated more or less than the value. The
following table indicates the stitches per 25.4mm and the stitches per 30mm.
Loosen the needle guard(back) clamp screw
and move the needle guard
to the very end then tighten the screw lightly.
(Refer to the Figure 37)
(This process is not necessary when narrowing the stitch length.)
Remove the left screw
of the bed. (Refer to the Figure 38)
Loosen the feed rocker link shaft screw
and adjust the stitch length.
(Move the screw
upward for increasing the stitch length and move the screw
downward for decreasing the stitch length.)
