27
Needle/Rotary Hook Adjustment
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TUNG FREIARM-FLACHBETTMASCHINEN_-_2022-09-27 - DC
Needle/Rotary Hook Adjustment
The values stated below are intended to help a specialist make the correct settings.
Changes to these values made by untrained personnel can damage the
machine.
Adjusting loop stroke/needle depth
The loop stroke is the distance from the bottom dead center (BDC) of the needle point
to the position of the point during the upward movement at which the point of the rotary
hook is located centrally behind the needle.
The needle depth is the distance between the top edge of the needle eye and the point of
the rotary hook.
Loop stroke
Needle depth
Fig. 27:
Needle depth, adjusting
Application
Loop stroke
[X=mm]
Needle depth
[Y=mm]
Flatbed machines
2,0
1,0
JAFA
2,0
1,0
SPRINT/RACER
2,5
1,0
q
Needle
w
Exact loop stroke
position
e
Bottom dead
center
r
Eye of needle
