17 MA_141_142_A10-6-7-3-6-5_130617_en
Fig. 6
4.5.2 Adjust the looper eccentric (on single thread machines)
Set looper eccentric (in position 1) so that ist surface stands horizontally
(Fig. 6). For setting the needle in its utmost rear position, turn the hand wheel
about 100 degrees (position 2). In this position, the looper is set about 2 mm on
the left of and about 3 mm above the needle, but this varies according to stroke
of loop (Fig. 7a). When the needle has moved forth to the looper’s right hand
edge, its point moves past the looper approx. 1 mm above it (Fig. 7b). At the
utmost dead point of the looper’s lateral and longitudinal movement, the point
of the needle is at 1 to 3 mm within the feed cup, which depends on how the
stroke of loop had been adjusted.
4.5.3 Adjust the looper eccentric (on two tread machines)
Set looper eccentric (in position 1) so that ist surface stands horizontally
(Fig. 6). For setting the needle in its utmost rear position, turn the hand wheel
about 100 degrees (position 2). In this position, the looper is placed in front of
and above the needle; the distance varies according to looper motion and
stroke of loop. (See chart)
When moving forth, the needle moves closely below the looper without actually
touching it (Fig. 8a) and takes up the thread from the looper’s groove. The
looper motion stops when the point of the needle reaches its center (Fig. 8b).
When the needle has taken up the thread and is about to penetrate the sewing
material (approx. 2 mm in front of the cup edge), the looper moves about
0.7 mm to the left, then past the sewing material to the front turning point
(stroke of loop) on the right. (See chart)
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