Adjustment Of The Thread Tail After The Trimming; Cancellation Of The Trimming; Adjustment Of The Upper Thread - Mitsubishi PLK-E0504 Technical Manual

7-15. Adjustment of the thread tail after the trimming

7-16. Cancellation of the trimming function
If the automatic trimming is not required during the sewing operation, cancel the trimming
function with the operation panel.
For the detail of this instructions, please refer to the paragraph [16.Program mode or
17.Program mode list] on the technical manual Operation Panel .
7-17. 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 0.8~1.0mm. This is the normal condition of the discs
(No.1) opening. For this adjustment, take the following procedure.
(1) Remove the top motor cover.
1
2
3
Adjust the thread tail (No.3) from the needle after
the trimming with turning the nut (No.2) of the
pre-tension (No.1).
If turn the nut (No.2) to the clockwise, the thread
tail becomes shorter and if turn the nut (No.2) to
the counter-clockwise, the tread tail becomes
longer.
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