Adjusting The Fore & Aft Position Of Needle Bar Rocker Frame; Motor Pulley And Sewing Speed - JUKI LG-158 Instruction Manual

24. ADJUSTING THE FORE & AFT POSITION OF NEEDLE BAR ROCKER
FRAME
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the following
work after turning the power off and ascertaining that the motor is at rest.
❷
❸

25. MOTOR PULLEY AND SEWING SPEED

1) Use a 3-phase 400 W AC clutch motor.
2) Use an M type V-belt.
3) The relation among the motor pulley, the sewing speed of sewing machine is as shown in the table below:
Model Sewing speed
LG-158
1,500 sti/min
LG-158-1
(Caution) The effective diameter of motor pulley is obtained by subtracting 5 mm from its outside diameter.
The correct distance between the walking foot bar ❶ and the presser bar ❷ is
17 mm (43/64") at the place shown in the fi gure when the stitch length is "0".
1. Set the stitch length to "0".
2. Loosen the needle bar driving crank clamp screw ❸ .
3. Then, by making the clearance between the walking bar and the presser bar
❶
Adjust the relationship between the needle and the feed dog needle hole
as follows:
1. Set the stitch length to "0".
2. Loosen the clamp screw ❹ of the feed rock shaft crank.
3. Then, by bringing the needle to about the center or nearer to front from the
❹
Effective
diameter of
handwheel
108.5
φ
to 17 mm (43/64"), tighten the screw ❸ .
center of the needle hole of feed dog, tighten the feed rock shaft crank clamp
screw.
Number
of poles of Frequency
motor
50Hz
2
60Hz
– 13 –
Number of
Effective diameter
revolution of
of motor pulley
motor
2,865 rpm φ
3,430 rpm φ
55
45