Vertical Position Of The Threader Hook; Reverse Stitch - JUKI HZL-30Z Service Manual

4-15 Vertical position of the threader hook

How to adjust 1. Attach a household needle HA X 1 #11.
2. Turn the hand wheel to bring the needle bar near the highest point of its stroke,
3. Bring the threader lever to the lowest point of its stroke and check that the clearance
4. Checking the position in terms of the needle eyelet, perform the adjustment.
* The hook has to enter the needle eyelet of needle #11 to #16.
Threader hook holder

4-16 Reverse stitch

Remove the front cover (including the face cover, throat plate, bottom cover and rear cover).
How to adjust 1. Turn the adjusting screw so that the stitch length of the reverse feed should be 2 mm
when the reverse stitch is made with the straight stitch.
(The stitch length of the reverse stitch has nothing to do with the feed amount and is
constantly 2 mm.)
Turn clockwise
Turn counterclockwise
loosen the setscrew in the threader hook holder and adjust the threader hook holder
in the vertical direction.
When the hook is low
When the hook is high
provided between the upper end of the threader hook and the upper end of the
needle eyelet is 0 to 0.1 mm. (When this dimension is not 0 to 0.1 mm, there is a
case where the threading cannot be peformed according to the needle size.)
When the hook goes in and out the needle eyelet, the needle should not be bent by
the hook.
When the hook shifts in the lateral direction, perform the correction of the bend of
the hook using the tip of a small screwdriver or the like, or replace the threader hook
holder with a new one.
Reduce stitch length of reverse feed.
Main shaft
Move the threader hook holder in the upper direction.
Move the threader hook holder in the lower direction.
Increase stitch length of reverse feed.
Timing belt
-15- -15- -15- -15- -15-
0