JUKI MOL-254 Engineer's Manual page 227

Phenomenon
1. Loop gather clicks B (front/rear) excessively
2. Folding shaft excessively protrudes.
Left-hand side of belt
loop is dog-eared.
1. Distance between loop gather clicks B (front/
2. Folding shaft excessively recedes.
Right-hand side of belt
loop is dog-eared.
1. Distance between loop gather clicks (front/rear)
(Rear)
2. For the front and rear folding shafts, one
(Front)
Dog-eared portions on
the front and rear of belt 3. Belt loops are likely to bend aslant because of
loop are alternately
oriented.
1. Pressure of the loop folding cylinder is
Heavy-weight interlined
and stiff belt loop
1. When supplying belt loops, the belt loops come
Heavy-weight and stiff
belt loop is used and belt
t e n s i o n r e l e a s i n g
amount is set to a large
amount.
Presser foot fails to move up or down smoothly,
and the presser foot fails to fully descend when
the belt loop completely comes out of the folding
wire.
Belt loop greatly tilts to
the right.
Cause
press the side of belt loop.
rear) and the side face of the loop catch is larger
than the belt loop width.
and the side face of the loop catch is different
from the belt loop width.
excessively recedes and the other excessively
extrudes.
belt loop texture direction.
insufficient.
in contact with the sole of the presser foot and
moves away from the correct position.
1. Move the loop gather click B to the left and
adjust the distance between the side face
of the loop catch and the loop gather.
2. Move the folding shaft to the right so that it
recedes. Change to the right side the [BI]
value on the adjustment screen of the
operarion box panel. See the Instruction
Manual on page 48.
1. Move the loop gather click B to the right to
adjust the distance mentioned in the left
column to the belt loop width.
2. Advance the folding shaft to the left. Change
to the right side the [BI] value on the
adjustment screen of the operation box
panel. See the Instruction Manual on page
48.
1. Move the loop gather click to the left for the
side of belt loop on which dog-eared portion
appears on the left, or to the right for the
side of belt loop on which dog-eared portion
appears on the right.
2. Move the folding shaft back toward the right
for the side of belt loop on which dog-eared
portion appears on the left, or forward
toward the left for the side of belt loop on
which dog-eared portion appears on the
right. This adjustment makes the folding
shaft metal bracket advance.
3. Perform the same adjustment as those
described in the corrective measures 1 and
2.
1. Turn the pressure reducing knob attached
to B-port of the device SV unit No. 3
clockwise to increase the pressure.
Lifting amount of the presser foot is insufficient.
Adjust the height of the presser foot (22 mm
above the top surface of the throat plate).
Expel air from the machine. Raise or lower the
the presser foot by hand to check its
movement. If the installing section of the
presser foot cylinder jars, correct it.
220
− −
Corrective measure