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12. STANDARD ADJUSTMENTS
12. STANDARDEINSTELLUNGEN
12. REGLAGES STANDARD
12. AJUSTES ESTANDARES
12-12. Adjusting the thread trailing length after thread trimming (B856E only)
w
e
r
5 mm
r
5 mm
2 - 4 mm
e
Stronger
Weaker
r
u
e
e
Should not touch
Longer
r
Shorter
153
q
t
B
A
Seen from direction B
A
t
e
0.5 mm
y
w
q
t
B
A
Seen from direction B
A
t
e
0.5 mm
■ Standard position for upper thread feeding device
The standard position for the upper thread feeding device
is as shown in the illustration.
1. Loosen the set screw q.
2. Turn the base w so that the end of the wire e is at a
position 5 mm below the position where the upper
thread r passes.
3. Tighten the set screw q.
y
* At this time, keep the end of the wire e 0.5 mm
away from surface A of the part where the thread
guide t is installed.
4. Loosen the two bolts y.
5. Move the wire e to the left or right so that the end of
the wire e is 2 to 4 mm from the top-left edge of the
thread guide t.
6. Tighten the bolts y.
■ Adjusting the upper thread trailing amount
The standard upper thread trailing amount after thread
trimming varies as shown below depending on the type
of thread used.
Upper thread
nylon 100D 1 X 3(Z)
#60 spun
If adjustment is necessary, adjust the position of the wire
e as described below.
1. Loosen the set screw q.
2. Turn the base w to adjust the vertical position of the
end of the wire e.
•
To increase the upper thread trailing amount, raise
the position of the wire e without letting it touch
the upper thread r.
•
To decrease the upper thread trailing amount, lower
the position of the wire e without letting it touch
the thread guide t.
3. After adjusting, tighten the set screw q.
* At this time, keep the end of the wire e 0.5 mm
away from surface A of the part where the thread
guide t is installed.
Note:
If the tension of the pre-tension y is to strong, it
will be more difficult to adjust the upper thread trail-
ing amount.
The pre-tension y should be adjusted to as weak a
tension as possible while still allowing the rotary
disc u to rotate smoothly.
*
The thread tension will change at this time, so
be sure to re-adjust the upper thread tension.
(Refer to page 123.)
LZ2-B855E,B856E
Upper thread trailing amount
50 - 60mm
40 - 50mm
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