JUKI IP-100 Engineer's Manual page 33

Adjustment Procedures
The amount of oil in the hook can be adjusted with oil amount adjusting screw 1.
1) Adjusting procedure
Turning (clockwise) oil amount adjusting screw 1 increases the oil
amount in the hook and turning (counterclockwise) it decreases the oil
amount in the hook.
(Caution) 1. When adjusting the amount of oil in the hook, perform the adjustment in
a way of reducing the oil amount after somewhat increasing it.
2.The amount of oil in the hook has been adjusted at the max.
number of revolution at the time of delivery. When you always
use the sewing machine at low speed, there is a possibility that
trouble occurs due to the lack of amount of oil in the hook. When
the sewing machine is used always at low speed, perform the
adjustment of the amount of oil in the hook.
<<Replacing procedure of hook shaft oil wick>>
1) Hook shaft oil wick 2 is a consumable part.
To stabilize the oil amount in the hook, it is recommended to periodically replace it.
Hook shaft oil wick 2 is mounted on the top end of hook shaft 4.
Remove the needle and the parts around the needle (presser foot,
needle, throat plate, feed dog, hook and woodruff plate), put a spanner,
top end of which is L-shaped to screw 3 section of hook shaft oil wick,
turn the handwheel in the normal direction of rotation by hand, and
draw out the screw. It is possible to replace hook shaft oil wick 2 while
hook shaft 4 is not removed. If hook shaft 4 is drawn out, refer to 5-
(9) Protruding amount of the hook shaft.
2) Hook shaft oil wick screw 3 (B1808552000) in which hook shaft oil wick
2 (11015906) is entered is assembled in hook shaft 4. Draw out the old
hook shaft oil wick 2 in hook shaft oil wick screw 3 and push a new hook
shaft oil wick 2. At this time, be sure to check that hook shaft oil wick 2
has entered up to the end of hook shaft oil wick screw 3.
™ When re-assembling, check that the hole at the top end of hook shaft oil
wick screw 3 is not broken.
3) Assemble hook shaft oil wick screw 3 to the top end of hook shaft 4.
Name of part
2
Hook shaft oil wick
3
Hook shaft oil wick screw
Adjustment Procedures
1) Move moving knife 2 forward until it will go no further (by
approximately 39 mm) and confirm that the end of slide plate
3 is spaced 34 ± 0.5 mm from the top of the moving knife 2.
2) Adjust the opersting pressure of counter knife 1 and moving
knife 2 by tightening screw 5 in clamp plate 4 .
3) At this time, the force to move moving knife pin 6 in the direction
of the arrow is more or less than 600 gf.
4) If screw 5 is excessively loose, defective thread trimming may
occur.
™ When the moving knife is properly positioned :
Needle thread on
the material side
Bobbin
thread
Needle eyelet
Needle thread on
the needle side
Part No.
11015906
B1808552000
Knife base
2
1
3
4
29
− −
Results of Improper Adjustment
™ When oil wick is stained, decrease
of oil amount in the hook or
unstableness of oil amount will
result.
™ When hook shaft oil wick 2 is not
entered up to the end of hook shaft
oil wick screw 3, hook shaft oil wick
screw 3 comes off during operation
and the oil amount in the hook
cannot be adjusted.
Besides, hook shaft oiling inlet is
closed and oil amount in the hook
is hard to be obtained.
™ When the hole is broken, replace
the screw with a new one.
Oil amount in the hook becomes
unstable.
Results of Improper Adjustment
™ When the moving knife is positioned in the front :
1) In the case where the needle
thread is trimmed twice :
Needle eyelet
™ When the moving knife is positioned in the rear :
2) In the case where the needle
thread is not trimmed :
How to solve the aforementioned troubles
1) In the case where the needle
thread is trimmed twice :
Slightly loosen screws 1 to 4, and
B
slant the knife base in the direction A.
Then tighten screws 1 to 4.
2) In the case where the thread is not
trimmed :
Slightly loosen screws 1 to 4, and
A
slant the knife base in the direction B.
Then tighten screws 1 to 4.
Needle eyelet
1
2
3
4