Adjustment Of The Upper Thread Tension Release - Mitsubishi PLK-E2010R Instruction Manual

4) Adjustment of the attaching position of the protector
Attach the protector (No.6) underneath the movable knife
(No.1) and fix it with the same set screw (No.7) for the
movable knife (No.1) at the position where the point of the
protector (No.6) is off 0.5mm left from the needle center
(No.4) and 4mm backward from the point of the movable
knife (No.1).

7-10 Adjustment of the upper thread tension release

NOTE a) The upper thread tension release works when the upper thread is trimmed automatically or
the presser foot is lifted during the work holder feeding.
b) If the upper thread tension release does not work properly when the upper thread is trimmed
automatically, the thread tail from the needle becomes shorter then, it induces the skip stitch
happening or pulling the thread tail out of the needle at the start of the sewing.
c) During the sewing operation, the discs (No.1) of the thread tension regulator is closed while
the presser foot is moving up and down.
If the discs (No.1) of the thread tension regulator is not closed, the upper thread tension
becomes loose and the proper stitch condition can not be obtained.
d) When the upper thread tension release is activated, the discs (No.1) the upper thread tension
regulator opens 0.8 to 1.0mm. This is the normal condition of the discs (No.1) opening. For
this adjustment, take the following procedure.
1) Remove the top covering.
2) Fully turn the crank (No.3) of the rotary solenoid
(No.2) in the arrow direction. At this time, adjust the
upper thread tension release so that the discs can be
opened 0.8 to 1.0mm.
3) For this adjustment, loosen the nut A then, if tighten
the nut B, the discs opening becomes wider and if
loosen the nut B, it becomes Narrower.
4) If the normal opening of the discs can not be
obtained with the nut adjustment, loosen the wire fix
screws (No.4) and adjust the tension of the wire
(No.5).
5) The wire (No.5) may be got longer over a long period
machine operation. At that time, adjust the upper
thread tension release again.
1)
0.8 to 1.0mm
- 35 -
off 0.5mm
6)
1)
4)
3)
A
B
7)
1)
3)
8)
5)
2)