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(3) Initial position of the bobbin case opening lever
Standard Adjustment
o LH-4128, 4128-7, 4168-7
When adjustment is based on the central point (green engraved marker line) of the 3-serial engraved
marking, the amount of opening for the inner hook stop and the throat plate rib becomes 0.3mm
(standard adjusting value).
Backward
travel end
Press the bobbin case
stopper
against the throat plate
ribs
.
0.3 to 0.4mm
oLH-4188-7
A
(4) Standard adjusting position for the inner hook guide arm shaft
Standard Adjustment
Setscrew
Slot
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