JUKI SC-921 Instruction Manual page 38

 Function of soft-down of presser foot (with AK device only) (Function setting Nos. 70 and 49)
This function can softly lower the presser foot.
This function can be used when it is necessary to decrease contact noise, cloth defect, or slippage of cloth
at the time of lowering the presser foot.
Note : Change the time of function setting No. 49 together at the time of selecting the function of soft-
down since the sufficient effect cannot be obtained unless the time of function setting No. 49 is
set longer when lowering the presser foot by depressing the pedal.
4 9 1
7 0
 Function of reducing speed of reverse feed stitching at the start of sewing (Function setting No. 92)
Function to reduce speed at the time of completion of reverse feed stitching at the start of sewing : Normal
use depending on the pedal condition (Speed is accelerated to the highest without a break.)
This function is used when temporary stop is used properly. (Cuff and cuff attaching)
9 2
 Retry function (Function setting No. 73)
When the retry function is used, if the sewing material is thick and not pierced with needle, this function
makes the needle pierce in the material with ease.
7 3
 Presser foot lifting solenoid suction time setting (Function setting No. 84)
Suction time of presser foot lifting solenoid can be changed. When heating is great, it is effective to lessen
the value.
(Caution) When the value is excessively small, malfunction will be caused. So, be careful when chang-
ing the value.
8 4 2
 Function of pedal curve selection (Function setting No. 87)
This function can perform the selection of the curve of number of rotation of the sewing machine against
the depressing amount of the pedal.
Change to this function when you feel that inching operation is hard or that pedal response is slow.
8 7
0 to 500 ms
4 0
10 ms/Step
0 : Function of soft-down of presser foot is not operative. (Presser foot is
0
rapidly lowered.)
1 : Selection of function of soft-down of presser foot
0 : Speed is not reduced.
0
1 : Speed is reduced.
Temporary stop
0 : Retry function is not provided.
1
1 - 10 : Retry function is provided.
1: Needle-bar returning force before operating the retry function: 1
(small) - 10 (large)
Setting range : 50 to 500ms <10/ms>
5 0
0 : Number of rotation of the sewing
0
machine in terms of the depress-
ing amount of the pedal increases
linearly.
1 : Reaction to intermediate speed in
terms of the depressing amount of
the pedal is delayed.
2 : Reaction to intermediate speed in
terms of the depressing amount of
the pedal is advanced.
– 36 –
Sew without stopping
without a break.
2
0
Pedal stroke (mm)
1