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6. SEWING SPEED TABLE
Operate the sewing machine at a speed equal to or lower than the maximum sewing speed selected from
those shown in the table below according to the sewing conditions.
For the LU-2810-7, 2860-7, 2818-7 and 2868-7, the sewing speed is automatically set according to the
amount of the alternating vertical movement of the walking foot and the presser foot.
In the case the stitch length exceeds 7 mm, change the maximum sewing speed referring to "6. Function set-
ting of SC-922" in the Instruction Manual for the SC-922.
Amount of alternate vertical movement
of the walking foot and presser foot
Stitch length : 7 mm or
less
Stitch length : More than 7
mm and 9 mm or less
Stitch length : More than 9
mm and 12 mm or less
(Only for the LU-2818-7
and -2868-7)
3 or less 3,000 sti/min
*
2,000 sti/min 1,800 sti/min
More than 3 or 4 or less 2,400 sti/min
*
2,000 sti/min 1,800 sti/min
More than 4 or 5 or less 2,000 sti/min 2,000 sti/min 1,800 sti/min
More than 5 or 9 or less 1,800 sti/min 1,800 sti/min 1,800 sti/min
* For the LU-2860, 2860-7 and 2868-7, the maximum sewing speed is 2,700 sti/min.
* In the case the LU-2860, LU-2860-7 or LU-2868-7 is used with the needle gauge of
20 mm or more, the sewing speed has to be set to 2,000 sti/min or less at all times.
7. MOTOR PULLEY AND V-BELT (LU-2810, LU-2860)
The M-type belt should be used.
The relation between the motor pulley and belt length and the sewing speed is as shown below.
Sewing speed
Effective diameter
of handwheel
Number
of poles
Frequency
Number of
revolutions of motor
Effective diameter of
motor pulley
V-belt size
2,500 sti/min Φ 76 mm 2
50 Hz 2,840 rpm Φ 65 mm 42 inch
60 Hz 3,400 rpm Φ 55 mm 41 inch
The 3-phase, 400 W, 2P clutch motor (1/2 HP) should be used.
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