Differential Feed Modification - SunStar SC 7900-Series User Manual

④ After adjusting the stitch length, fix it firmly by tightening the feed rocker link shaft screwⓓ then fill the left screwⓒ of the bed.
(The left screwⓒ of the bed is to prevent oil leakage so tighten it firmly.)
⑤ After adjusting the needle guard(back)ⓑ to the proper position and tighten the needle guard(back) clamp screwⓐ firmly.
Reset the needle guard(back)ⓑ to prevent the breakdown of parts after adjusting the stitch
length.
Caution
ⓐ
Adjust the main feed all the time after adjusting the differential feed.
Caution

9) DIFFERENTIAL FEED MODIFICATION

Check the OFF-status condition of a power switch before adjusting the differential feed
adjustment.
Warning
To adjust the differential feed dog, rotate the differential feed
operating leverⓐ to the left or the right.
If the differential feed operating leverⓐ is between the 4 and 5,
the momentums of the main feed dog and the differential feed
dog will be the same.
For the forward differential, turn the differential feed operating
leverⓐ to the scale of 9. For the reverse differential, turn the
differential feed operating leverⓐ to the scale of 1.
Tip) The differential operating lever stopper screwⓑ can be used
when fixing the differential feed operating leverⓐ or retaining the
adjustment range of the differential motion.
28
ⓑ
[ Figure 37 ]
ⓒ
Forward
Reverse
ⓑ
ⓐ
ⓑ
increasing
decreasing
ⓓ
[ Figure 38 ]
[ Figure 39 ]