Adjustment
19
1.05.13 Bobbin case opener stroke
Requirement
When the balance wheel is turned
1. The beak 4, when it is at the right point of reversal of the bobbin case opener 1,
should rise from the needle plate 5 by the thickness of the thread.
2. The bobbin case opener 1 should be at its left point of reversal when the balance
wheel is positioned at "10°".
● Adjust bobbin case opener 1 (screw under cover 2) in accordance with requirement 1.
● Adjust the eccentric (screw under cover 3) in accordance with requirement 2.
The thread must be able to pass unhindered between bobbin case opener 1
and bobbin case 6.
Fig. 1 - 13
4
5
1
6
3
2
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