Vertical Adjustment Of Presser Foot; Main Feed Adjustment - SunStar SC 7900-Series User Manual

Speed overlock direct drive, 4-needle flat seamer feed off the amp type

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7) VERTICAL ADJUSTMENT OF PRESSER FOOT

Set the needle bar to the lowest point.

Loosen the pressure adjustment fixation nut

(When rotating the pressure adjustment nut counterclockwise, the presser foot is lifting.)

Adjust the distance between the presser foot base

(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

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

(Refer to the Figure 37)

(This process is not necessary when narrowing the stitch length.)

Remove the left screw

Loosen the feed rocker link shaft screw

(Move the screw

upward for increasing the stitch length and move the screw

and adjust it by rotating the pressure adjustment nut .

and the presser foot spring plate A

and move the needle guard

of the bed. (Refer to the Figure 38)

and adjust the stitch length.

firmly.

to the very end then tighten the screw lightly.

downward for decreasing the stitch length.)

to 0.3~0.5mm.

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