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(3) Supplement for the memory switch
①
Bird’s nest short tail function timing chart (summary)
(LK-1900B-B, 1903BN-B)
Presser foot thread trimming motor
Feed motor
Thread clamp motor
Thread-waste suction nozzle
Shorter-thread remaining thread trimmer
Thread-waste suction mechanism
Needle thread end is trimmed
Memory switch U33=2
Memory switch U89=100
Memory switch
_
K98=50
Memory switch
_
U87=110
Memory switch K96=10
Memory switch K97=50
Memory switch U86=110
Thread spreading
Thread trimmer
Presser foot goed up
Memory switch K100 : X travel amount
Memory switchU88=3
Needle thread end is released
Memory switch K99 : Y travel amount
The thread end clamped by the thread clamp device
is pulled and trimmed (by the counter knife mounted on
the rear side of needle hole guide). The trimmed needle thread end is released with the memory switch U088
and sucked with U089.
(LK-1903B-B, 1903BN-B)
Presser foot thread trimming motor
Feed motor
Thread clamp motor
Thread-waste suction nozzle
Shorter-thread remaining thread trimmer
Thread-waste suction mechanism
Needle thread end is retained
Needle thread end is released
Memory switch
_
K98=50
Thread spreading
Thread trimmer
Memory switch K99 : Y travel amount
Memory switch K100 : X travel amount
Presser foot goed up
Memory switch K96=10
Memory switch U86=140
Memory switch U89=100
Memory switch U90=80
Memory switch
_
U87=110
Memory switch K97=50
The needle thread end clamped by the thread clamp device is held in this state until the end of sewing is
reached. Needle thread end is trimmed together with bobbin thread by the "(remaining end) thread trimmer".
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