JUKI MF-7800D Series, Руководство инженера

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(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
is the same as dimension
B
when the needle bar goes up from the
lower dead point, the blade point of looper passes the rear of needle, and the left end of right needle aligns
with the blade point of looper, and when the needle bar comes down from the upper dead point, the blade
point of looper passes the front of needle, and the right end of right needle aligns with the blade point of
looper.
(Looper timing is more advanced by a piece of needle than the needle bar timing.)
Standard Adjustment
Going of looper Returning of looper
B
A