– 59 –
4) Moving knife (adjustment of vertical positioning)
1. Let the sewing machine fall down and loosen the moving knife driving
arm tightening screw
and the moving knife shaft thrust collar
setscrew
.
2. Move the moving knife
vertically so that the gap is adjusted to 0.5
to 0.6mm between the bottom surface (rear side) of the throat plate
and the top surface of the moving knife
.
(At that time, it is possible to use an accessory adjusting gauge.)
3. Tighten the moving knife driving arm tightening screw
and the
thrust collar setscrew
.
When tightening the moving knife driving arm tightening screw
,
follow the adjusting procedures of 7), 8), 9), and 10) to be described
later.
5) Counter knife (adjustment of vertical positioning)
1. Loosen the counter knife base tightening screw
and let the upper
blade end of the counter knife
coincide with the upper surface of
the moving knife
.
(In this case, pay attention to hook’s blade point. Work can be done
safely if the main shaft angle is adjusted to the vicinity of the engraved
mark line L.)
2. After adjustments, tighten the counter knife base tightening screw
.
2.4
43.0
(t = 0.6)
29.0
26.8
37.8
9.0
Adjustment Procedure
Results of Improper Adjustment
Adjusting gauge (accessory)
