Needle-To-Hook Relationship - JUKI PS-800-12080 Instruction Manual

4-8. Needle-to-hook relationship

WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
(1) Needle and hook, and angle setting
Front face Side face
(2) Position of the needle and the inner hook holder
S type: 2.9 ± 0.3 mm
H type: 2.4 ± 0.3 mm
0.05 to 0.2 mm
1) For the S type, the relation between the needle
bar height and the hook position should be adjust-
ed when the needle bar goes up from its lower
dead point by 2.9 ± 0.3 mm. For the H type, it
should be adjusted when the needle bar goes up
from its lower dead point by 2.4 ± 0.3 mm.
2) When observing from the front face of the sewing
machine, the blade point of hook seems to over-
lap with the center of needle.
3) When observing from the side face of the sewing
machine, the clearance provided between the
blade point of hook and the scarf of needle is 0.05
to 0.2 mm.
If thread breakage occurs, the thread can
be tangled in the hook. In such a case,
remove the thread being tangled in the
hook carefully. Then, re-start sewing.
4) As shown in the figure, the electrical shaft angle
setting QEP value displayed on the operation
panel becomes 570 to 575.
Longitudinal position of the inner hook holder and
needle: The front end of needle is aligned with the
inner hook.
Lateral position of the inner hook holder and needle:
The rightmost end of projection of inner hook holder
is aligned with the right side of needle.
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