Adjustment Of The Shuttle Race Thread Guide - Mitsubishi PLK-G6030 Technical Manual

7-5. Adjustment of the shuttle race thread guide

(1) Remove the E-shaped snap ring (No.3) which is engaging the movable knife (No.2) and the link
(No.1) then, loosen the setscrews (No.4) and remove the sliding plate (No.5).
(2) Loosen the setscrews (No.10) and move the thread guide (No.6) to the position where the needle
center line (No.8) divides the needle groove (No.7) evenly and the rear side line (No.9) of the needle
is aligned with the shoulder (No.9) of the thread guide (No.6). At this time, make sure that there is
some clearance between the hook retainer and the thread guide (No.6) at least the upper thread can
be passed smoothly through it (standard clearance is 0.8mm).
If this clearance is too wide, it causes the trimming failure and if this clearance is too narrow, it causes
the sewing condition disturbance, the trimmed upper thread tail uneven and the locking up the hook
with the upper thread.
(3) After the adjustment, engage the link (No.1) of the trimmer mechanism with the movable knife (No.2)
with the E-shaped snap ring (No.3) and put the sliding plate (No.5) back on the original location then,
tighten the setscrews (No.4). At this time, set the sliding plate (No.5) so that the needle (No.11) can
come down to the center (No.12) of the needle hole of the needle plate.
7-6. Adjustment of the presser foot
NOTE The presser foot is a very important part to form the fine stitches. It moves simultaneously with
the needle and stabilize the needle penetrating area of the sewing material with pressing down
it, when the needle sticks into or pulls out the sewing material and prevent the skip stitch or the
over penetration happening Please adjust the presser foot properly to the sewing materials
with the following instructions.
7-6-1. Adjustment of the presser foot position
NOTE Please always adjust the presser foot position when the thickness of the sewing material is
changed.
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