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MA_325-40D-TP_A9_181015_en
3.3
The needle glide plate is fixed on the lower side of the stitch plate. It can be
withdrawn by loosening the screw 170.0263.
Adjusting needle and replacing needle glide plate
The bottom of the needle channel of a sample needle glide plate screwed on to
the stitch plate must be placed 0.01 - 0.04 mm higher than the theoretical
needle radius. Check with a gauge.
If this setting is correct, there must be a play of 0.25 - 0.35 mm between a
tested needle series 1717 and the stitch plate radius. (Also to be checked with
a gauge).
In the lateral direction the needle is set so that there is a distance of 0.2
+0.1
mm
between its right outside edge and the thread slit of the needle plate.
The needle slide plate must be adjusted so that between the right needle
channel wall and the outside edge of a 110 needle, there is a distance of
0.1 mm.
3.4
Stroke of loop means the needle race from its lowest position to the spot where
the lower point is placed on top of the center of the needle.
Stroke of loop
3.4.1
The standard stroke of loop, i.e. 2.5 - 3 mm is set at the factory. In case of
changing this stroke, loosen both screws of the gear (1) on the rear side of the
head (
Changing stroke of loop (Fig. 3)
Fig. 3). Turning this gear, the hook can be adjusted in a manner that it
will catch the thread loop sooner or later. Upon tightening those two screws,
insure a normal play between the barrel bevel wheels. To change the stroke of
loop it is necessary to reset the needle lever in almost all cases.
