Owner's Manual

Z-8550A, 8560A
12. STANDARD ADJUSTMENTS
70
<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 Upper thread trailing amount
Nylon 100D 1 X 3(Z) 50-60mm
#60 spun 40-50mm
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) 0.5 mm away
from surface (A) of the thread guide (5).
NOTE:
If the tension of the pre-tension (6) is to 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 page 47.)
12-17. Adjusting the thread wiper (8560A only)
<Horizontal position adjustment>
• The front corner of the thread wiper (2) and the left edge
of the needle hole of the presser foot (3) (or the needle
hole of the needle plate (4)) should be aligned 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>
• Check that the distance from the bottom edge of the
tread wiper (2) to the top of the needle plate (4) is 6 to 8
mm, and that the thread wiper (2) catches the thread
firmly.
• Loosen the screw (7) and move the thread wiper (2) up or
down to adjust.
Align
3545M
<When seen from the rear>
<When seen from the front>
3544M
3543M
Seen from direction (B)
Stronger
Should not touch
Longer
Shorter
Weaker