JUKI MEB-3200 Series, Instruction Manual

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54
■ T type (short thread trimming without gimp)
Adjusting the looper thread presser
1) Loosen setscrew .
2) Fully press downward throat plate and install it. (Fig.
1)
3) Lightly press upward the looper thread presser so that a
clearance is not provided between looper thread presser
and the bottom surface of throat plate . Then tighten
setscrew .
4) Loosen nut and tighten adjusting screw until
the top end of the screw comes in contact with looper
bracket
.
5) Further, turn it by 1/4 turn and fi x it with nut .
6) Loosen nut . (Fig. 2)
7) Press section of installing base in the direction of
arrow mark D with fi nger, tighten adjusting screw so
that the thread guide section of looper thread presser
protrudes from throat plate by approximately 0.5
mm and fi x the screw with nut . (Fig. 2 and Fig. 3)
• When the clearance provided between throat
plate and the looper thread presser is
smaller than the speci fi ed value, the looper
thread holding force is insufficient. As a
result, stitch skipping at the start of sewing
or defective roll-in of thread will be caused.
• W h e n t h e l o o p e r t h r e a d p r e s s e r i s
excessively pressed to throat plate ,
component breakage or excessive tightness
of stitches at the start of sewing will result.
Adjusting the looper thread trimming knife
8) Loosen setscrew and adjust so that the top end
of looper thread trimming knife is located at the
position of 1 to 2 mm from section of throat plate
and that a clearance of 0.2 to 0.4 mm is provided
between the bottom surface of the looper thread
trimming knife and throat plate
. (Fig. 3 and Fig. 4)
9) Loosen nut .
10) Tighten adjusting screw so that the blade point
of looper thread trimming knife protrudes from
end plane of throat plate by approximately 1
mm. Then fi x it with nut . (Fig. 1 and Fig. 3)
11) Press section of knife installing base in
the direction of arrow mark D with finger, tighten
adjusting screw
(double thread screw) so that
the top end of looper thread trimming knife
aligns with the end plane of throat plate . Then fi x
the base. The standard of the protruding amount of
adjusting screw
is 1.4 mm. (Fig. 2 and Fig. 3)
• When the lateral position of looper thread
trimming knife is not obtained, thread
trimming failure or interference with the
presser will result.
• When looper thread trimming knife is
positioned too high, looper thread trimming
failure or cut-off of stitches will result.
When the looper thread is not retained immediately
after threading or the like, perform sewing after
retaining the looper thread at section
of throat
plate with looper thread presser .
1 to 2 mm
Fig. 1
Fig. 2
Fig. 3
Fig. 4
1 mm
0
1.4 mm
Approx. 1 mm
Approx. 0.5 mm
0
1 to 2 mm
0.2 to 0.4 mm
D