JUKI LK-1910 Engineer's Manual page 19

Adjustment Procedures
1) Remove the motor cover and remove intermediate presser
lifting spring 2 from intermediate presser lifting spring retainer
1.
2) Tilt the machine head.
3) Turn the hand pulley to bring the needle bar to its lower dead
point. In this state loosen setscrews 5 and move solenoid
installing base 6 in the direction of
A of plunger 3 is aligned with face B of solenoid frame 4
when plunger 3 is lightly pulled in the direction of ←.
4) Turn the hand pulley to bring the needle bar near its upper
dead point.
5) After the adjustment, hook intermediate presser lifting spring
2 to intermediate presser lifting spring retainer 1.
* When hooking internediate presser lifting spring 2 to
intermediate presser lifting spring retainer 1, protruding
amount of plunger 3 from solenoid frame 4 becomes 15
to 16 mm.
Adjustment Procedures
1) Determine the height of the wiper when the needle bar is at its
upper stop position.
Loosen setscrew 1 in the wiper shaft cap and turn the wiper
shaft cap so that the wiper comes almost below the needle.
Then temporarily tighten setscrew 1.
2) Loosen setscrew 2 and adjust so that clearance provided
between the needle and the wiper should be 1 mm or more.
Then tighten setscrew 2 at the position where the angle of the
wiper is parallel to the needle.
3) Loosen wiper shaft cap setscrew 1 and press down the link
until it hits in the direction of A. Adjust the longitudinal position
to 7 to 8 mm in front of the needle. Adjust the lateral position to
4 to 5 mm from the root of the wiper to the center of the needle.
Then tighten setscrew 1.
to adjust so that face
14
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Results of Improper Adjustment
™ If face A enters further than face
B, abnormal noise will occur
when operating the sewing
machine.
™ If the protruding amount is
excessive, the intermediate
presser may not come down at
the time of sewing start.
Results of Improper Adjustment