–
26
–
Standard Adjustment
Results of lmproper Adjustment
1. Changing the longitudinal motion of the looper
(1) Remove 11 setscrews in bed top cover
1
and remove the cover.
(2) When increasing the longitudinal motion of the looper, loosen nut
3
and lower the arm downward (+). from the engraved marker
line.
(3) When decreasing the longitudinal motion of the looper, loosen nut
3
raise the arm upward (-) from the engraved marker line.
Perform the adjustment in accordance with the needle used.
(Caution)
After adjusting the longitudinal motion of the looper, move
the looper holder and re-adjust the longitudinal position
of the needle and the looper. (Refer to "(8) Returning
amount of the looper.)
2. Changing the locus of the looper
(1) Loosen two setscrews
6
in the cam and change the locus of the
looper by turning the upper pulley with the cam fixed.
When it is turned in the direction of rotation, the timing is retarded,
and when turning in the reverse direction of rotation, the timing is
advanced.
(Caution)
1. It is possible to change the locus of the looper.
However, do not excessively change it from the standard
position.
2. When changing the locus of the looper, be sure to check
whether the top end of left needle touches the position
of 1/4 to 1/3 from the bottom face of the back of the looper.
™
When the longitudinal motion of the
looper is small, the rate that needle
touches the back of the looper is
increased and blunt needle tip will be
caused.
™
When the longitudinal motion of the
looper is large, the clearance provided
between the needle and the back of
the looper is increased and stitch
skipping at the time of returning of the
looper will be caused.
™
When the timing is
retarded
, stitch
skipping is apt to occur at the time of
going of the looper, and especially the
clearance provided between the
looper and the left needle is widened.
Needle strongly touches the back of
the looper and blunt needle tip will be
caused.
™
When the timing is
advanced
, stitch
skipping is apt to occur at the time of
returning of the looper.
Chain-off thread does not come out
smoothly.
™
When removing the top cover for
adjustment or the like, sealant is
peeled off. As a reult, oil leakage will
be caused.
