2.5.2 Adjusting the gear clearance of the hook drive
Standard checking
The gear clearance between worm and worm wheel should be as small
as possible. The free movement must, however, remain guaranteed.
The gear clearance has to be reset after every adjustment of the hook
drive in axial direction (alteration of the needle distance).
Caution: Danger of injury !
Switch off the main switch.
Check and adjust the gear clearance only with the sewing unit
switched off.
–
Check the gear clearance while turning the hook slightly.
Correction
–
Loosen screw 6.
–
Loosen screw 1 slightly.
–
Loosen the clamping screws of the worm wheel 4 slightly.
–
Shift the worm wheel 4 axially.
The distance between the worm wheel 4 and the inner side of the
hook case must amount to 0.3 mm.
At the right hook case the distance must be on the right of the
worm wheel and at the left hook case on the left of the worm wheel.
–
Measure the distance with a feeler gauge.
–
Adjust the gear clearance by turning the eccentric bush 5.
The gear clearance between worm wheel and worm should be
small, but still palpable.
Increase the gear clearance: Turn bush 5 upwards.
Reduce the gear clearance: Turn bush 5 downwards.
–
Check the looping stroke (chapter 2.5.3) and the distance between
hook tip and needle (see chapter 2.5.5) and correct, if necessary.
–
Tighten screws 1 and 6.
28
5
6
1
2
3
4
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