Maintenance; Adjusting The Needle Thread Heat Cutter Unit Position; How To Replace The Heat Wire - JUKI LK-1942ZA5050 Betriebsanleitung

VI. MAINTENANCE

1. Adjusting the needle thread heat cutter unit position

Standard adjustment
❶
A
B

2. How to replace the heat wire

Standard adjustment
❸
❷
❹
Adjustment procedures
Position the needle thread heat cutter unit
with reference to the top surface of the
material and the needle.
Loosen heater up/down adjustment screw
A and adjust the height of the heat wire
from the top surface of material ① to 1 to
2 mm.
Loosen heater right/left adjustment screw
B and adjust the distance of the heat wire
③
from needle ② to 3 to 5 mm.
①
Loosen setscrew ❶ to adjust position of
wiper ③ so that it is, as a guide, 13 to 15
②
mm away from the needle.
Remember that the aforementioned ad-
justment values are mere guides. Make
the aforementioned adjustments so that
the length of thread remaining on the top
surface of the material is 2 to 5 mm by
actually trimming the thread.
Adjust the length of thread remaining at
the needle eyelet to 25 to 30 mm as a
guide. In addition, the adjustment values
may vary with the material and stitch
length. It is, therefore, necessary to adjust
to minimize the length of thread remaining
at the needle eyelet as long as the thread
does not slip off the eyelet.
Adjustment procedures
Preliminary preparation
Turn OFF the power and air supply, low-
er needle thread heat cutter unit ❸ to
its lower end. Be sure to bring the wiper
❶
to the escape position beforehand to
prevent the unit from interfering with the
wiper.
1. Loosen heat cutter unit mounting screw
❷ and remove needle thread heat cut-
ter unit ❸ from arm ❶ .
It is not necessary to remove the arm
from the machine.
Leave heat cutter power line ❹ as it is.
– 12 –
Results of improper adjustment
Faulty needle thread trimming
can occur.
Thread slips off the needle
eyelet at the beginning of next
sewing.
Results of improper adjustment
Faulty needle thread trimming
can occur.