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Z-8550A, 8560A
9. ADJUSTMENTS
84
<Adjusting the upper thread trailing amount>
The standard trailing length for the upper thread is 50-60
mm.
If adjustment is necessary, adjust the position of the wire e
as described below.
1. Loosen the set screw (1).
2. Turn the base (2) to adjust the vertical position of the end
of the wire (3).
• To increase the upper thread trailing amount, raise
the position of the wire (3) without letting it touch the
upper thread (4).
• To decrease the upper thread trailing amount, lower
the position of the wire (3) without letting it touch the
thread guide (5).
3. After adjusting, tighten the set screw (1).
* At this time, keep the end of the wire (3) 1 mm away
from surface (A) of the thread guide (5).
NOTE:
If the tension of the pre-tension (6) is too strong, it will be more difficult to adjust the upper thread trailing amount.
The pre-tension (6) should be adjusted to as weak a tension as possible while still allowing the rotary disc (7) to rotate
smoothly.
* The thread tension will change at this time, so be sure to re-adjust the upper thread tension. (Refer to “9-1. Adjusting
the thread tension” of the Instruction Manual.)
9-24. Adjusting the thread wiper (8560A only, optional device)
<Horizontal position adjustment>
• The front corner of the thread wiper (2) should be
positioned 9 mm away from the left edge of the needle
hole of the presser foot (3) (or the needle hole of the
needle plate (4)) when the solenoid plunger (1) is pushed
up as far as it will go.
• Loosen the two screws (5) and move the setting plate (6)
up or down to adjust.
<Height adjustment>
• Adjust so that the distance from the bottom edge of the
thread wiper (2) to the top of the needle plate (4) is 5 mm.
• Loosen the screw (7) and move the thread wiper (2) up or
down to adjust.
<Forward/back adjustment>
• Adjust so that the edge of the thread wiper (2) is
positioned 1 mm forward of the needle tip (8).
• Loosen the screw (7), and then turn the thread wiper (2)
to adjust.
3811M
Seen from direction (B)
Stronger
Should not touch
Longer
Shorter
Weaker
3812M
<When seen from the rear>
<When seen from the front>