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19
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Standard Adjustment
(7) Adjusting the timing relation between the looper and needle bar
1. Timing relation between the looper and the needle bar (synchronization)
It is the standard that dimension
A
from the top end of needle eyelet to the blade point of looper passes the rear
of the needle and comes to the position of the right end of left needle is the same as dimension
B
from the top end
of needle eyelet to the blade point of looper when needle bar comes down from the upper dead point, the blade
point of looper passes the front of needle bar and comes to the position of the right end of left needle. (
A
=
B
)
Going of looper
A
Returning of looper
B
