Adjusting The Hook Needle Guard; Adjusting The Inner Hook Guide - JUKI LH-3500A Series Instruction Manual

6-4. Adjusting the hook needle guard

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.
❶
❷
0 to 0.05mm
When replacing the hook, confirm the position of the needle guard.
The standard position of the hook needle guard is obtained when hook needle guard ❷ comes in contact
with the side face of needle ❶ and the engagement length between the needle and the hook needle guard is
0 to 0.05 mm. If not, adjust by bending the hook needle guard.
1) When bending the hook needle guard inward, perform by entering a screwdriver to the outside of the
hook needle guard.
2) When bending the hook needle guard outward, perform by entering a screwdriver to the inside of the
hook needle guard.
At this time, confirm that the clearance between the needle and the blade point of hook is 0.01 to 0.05 mm.
"4-17. Needle-to-hook relation"
(Refer to

6-5. Adjusting the inner hook guide

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.
❹
A
(Bend inward.)
❷
p.27.)
❸
❷
❶
❺
1) Turn the handwheel in the normal direction to
bring inner hook guide ❶ to the extreme rear
position.
2) Turn bobbin case ❷ in the direction of the arrow,
and make inner hook stopper ❸ come in contact
with the groove of throat plate ❹ .
3) Loosen inner hook guide setscrew ❺ , set the
clearance between the inner hook guide and pro-
trusion A of the bobbin case to 0.2 to 0.3 mm,
and securely tighten inner hook guide setscrew
❺ .
– 37 –
(Bend outward.)
❷