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When the sewing speed or stitch pitch is changed, the normal- and reverse-feed stitch needle entry points
may not be aligned at the time of automatic reverse feed stitching.
In such a case, correct the alignment of needle entry points by changing the ON/OFF timing of the automatic
reverse feed cylinder. In the case the timing compensation is difcult since the stitch pitch is large, it is rec-
ommended to decrease the reverse feed stitching speed or use the temporary stop function at each corner
section of the material.
Refer to
"III-8. Detailed explanation of selection of functions
Compensation of timing of the sole-
noid for reverse feed stitching"
in the Instruction Manual for the SC-922
for detail.
1) How to align needle entry points of the reverse feed stitching with those of the normal feed stitching
Carry out "correction of the timing of the reverse feed stitching" according to the difference between the
needle entry points of the reverse feed stitching and those of the normal feed stitching.
Refer to
"III-6. Setting the SC-922 functions" in the Instruction Manual for the SC-922
for how to
carry out the "correction of the timing of the reverse feed stitching".
②
Correction of the OFF-timing of
the reverse feed stitching at the
beginning of sewing (Function
setting No. 52)
③
Correction of the OFF-timing of the
reverse feed stitching at the end of
sewing (Function setting No. 53)
Sewing starting position
Stitch
length is
smaller
Decrease the set
value of No. 51.
Increase the set
value of No. 51.
2) Reverse feed stitching speed on basis of stitch pitch (function No. 8) and temporary stop function at
each corner section of the material (function No. 151)
Default value Recommended value Recommended value
Stitch pitch (mm) 3 to 7
8 to 9 10 to 12
Reverse feed stitching speed (sti/min) 600 550 550
Temporary stop function at each
corner section of the material
0 (OFF) 0 (OFF) 1 (ON)
Decrease the set
value of No. 52.
Increase the set
value of No. 52.
Stitch length is
smaller
Decrease the set
value of No. 53.
Increase the set
value of No. 53.
Stitch length is
smaller
Sewing
end
position
①
ON-timing of the reverse feed
stitching at the beginning of sewing
(Function setting No. 51)
5-4. Normal-/reverse-feed stitch needle entry points alignment at the time of
automatic reverse feed stitching
Stitch length is smaller
Sewing
end
position
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