JUKI LU-2800 Series, Engineer'S Manual

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(18) Detection switch of the amount of alternate vertical movement
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
Standard adjustment
Sewing speed
Model
Amount of alternate vertical
movement
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
LU-2810-6
LU-2810-7
Less than 3 mm 3,000 sti/min 2,000 sti/min ―
3 mm to less than 4 mm 2,400 sti/min 2,000 sti/min ―
4 mm to less than 5 mm 2,000 sti/min 2,000 sti/min ―
5 mm to less than 9 mm 1,800 sti/min 1,800 sti/min ―
LU-2860-6
LU-2860-7
Less than 3 mm 2,700 sti/min 2,000 sti/min ―
3 mm to less than 4 mm 2,400 sti/min 2,000 sti/min ―
4 mm to less than 5 mm 2,000 sti/min 2,000 sti/min ―
5 mm to less than 9 mm 1,800 sti/min 1,800 sti/min ―
LU-2828-6
LU-2828-7
Less than 3 mm 3,000 sti/min 2,000 sti/min ―
3 mm to less than 4 mm 2,400 sti/min 2,000 sti/min ―
4 mm to less than 5 mm 2,000 sti/min 2,000 sti/min ―
5 mm to less than 9 mm 1,800 sti/min 1,800 sti/min ―
LU-2818-7
Less than 3 mm 3,000 sti/min 2,000 sti/min 1,800 sti/min
3 mm to less than 4 mm 2,400 sti/min 2,000 sti/min 1,800 sti/min
4 mm to less than 5 mm 2,000 sti/min 2,000 sti/min 1,800 sti/min
5 mm to less than 9 mm 1,800 sti/min 1,800 sti/min 1,800 sti/min
LU-2868-7
Less than 3 mm 2,700 sti/min 2,000 sti/min 1,800 sti/min
3 mm to less than 4 mm 2,400 sti/min 2,000 sti/min 1,800 sti/min
4 mm to less than 5 mm 2,000 sti/min 2,000 sti/min 1,800 sti/min
5 mm to less than 9 mm 1,800 sti/min 1,800 sti/min 1,800 sti/min
(Caution) 1. To use the machine with the stitch length is set at more than 7 mm, adjust the
sewing speed by manual.
2. For the LU-2810-6, adjust the sewing speed so that it is same with that of the LU-
2810-7. For the LU-2860-6, adjust the sewing speed so that it is same with that of
the LU-2860-7. For the LU-2828-6, adjust the sewing speed so that it is same with
that of the LU-2828-7.
If the sewing machine carries out sewing at a speed higher than the aforemen-
tioned ones, the related parts can break and the life of those parts can be short-
ened. In order to prevent those problems, the maximum sewing speed has to be
strictly observed.
Scale of alternate vertical dial Switch (upper) (Red and green lines) Switch (lower) (White and black lines)
1 to 3 OFF OFF
3.25 to 4 OFF ON
4.25 to 5 ON ON
5.25 to 9 ON OFF
❶
❸
❷
❶
❸
0 to 0.4 mm
Green
Black
Red
White