Adjustment of differential feed ratio – Sears OVERLOCK 3/4D 385.16631 User Manual
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SECTIOM 3. LEARN THF STITCHES
Adjustment of Stitch Length
The larger the number, the longer the stitch.
The stitch length can be adjusted from 1 to 4 mm
{approx. 1/32" to 5/32").
Position "R" is for rolled and narrow hemming.
Adjustment of Differential Feed Ratio
The differential feed ratio can be altered by turning the dial.
The number on the dial indicates the differential feed ratio between the main and the sub
feed motion.
1.0 indicates the neutral position-no differential feed.
How to Adjust
® If the sewn fabric is stretched, turn the dial
counter-clockwise (from 1.0 to 2.0) to avoid.
Differential
feed
gathers
Stretched
® If the sewn fabric is puckered, turn the dial clock
wise (from 1.0 to 0.7) to avoid.
NOTE:
Maximum differential feed ratio sets automatically to a maximum between 1.7 and 2.0 when the stitch length is set between
3.3 and 4.0.
Maximum stitch length and differential feed ratio cannot be set at the same time. If limits are exceeded for one control dial,
the other dial will automatically sat to its maximum.
The puckering may be eliminated by reducing thread tensions as well as adjusting the differential feed ratio.
Desired
Differential
feed
stretches
Puckered
Desired
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